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Pulse Width Modulation patents



      
           
This page is updated frequently with new Pulse Width Modulation-related patent applications. Subscribe to the Pulse Width Modulation RSS feed to automatically get the update: related Pulse RSS feeds. RSS updates for this page: Pulse Width Modulation RSS RSS


Display device and driving method thereof

Display device and driving method thereof

System and method for pulse width modulation

System and method for pulse width modulation

System and method for pulse width modulation

Dc to dc converters, pwm controllers, and inductor current emulation circuits therefor

Date/App# patent app List of recent Pulse Width Modulation-related patents
12/11/14
20140365702
 Sensor network using pulse width modulated signals patent thumbnailSensor network using pulse width modulated signals
A device includes a bus interface to couple to a shared bus of a sensor network. The device also includes a sensor interface to couple to a sensor of the sensor network.
12/11/14
20140362292
 Display device and driving method thereof patent thumbnailDisplay device and driving method thereof
A display device including a display panel which displays a video signal is disclosed. The display device includes a panel driver configured to drives the display panel; a light source configured to provide light to the display panel; a light source driver configured to control the brightness of the light source in accordance with a pulse width modulation dimming signal in synchronization with a vertical sync signal; and a controller configured to receive the vertical sync signal, determine whether the frequency of the vertical sync signal is normal or abnormal, and provide the dimming signal (pwm pulses) to the light source driver in non-synchronization with the vertical sync signal during at least one frame, in response to the frequency of the vertical sync signal being abnormal..
12/11/14
20140361829
 System and method for pulse width modulation patent thumbnailSystem and method for pulse width modulation
A circuit for use with pwm signal having first pulse and a second pulse, wherein the first pulse has a period and a first duty cycle, and the second pulse has the period and a second duty cycle. The period has clock information therein, the first duty cycle has first data information therein, and the second duty cycle has second data information therein.
12/11/14
20140361755
 Dc to dc converters, pwm controllers, and inductor current emulation circuits therefor patent thumbnailDc to dc converters, pwm controllers, and inductor current emulation circuits therefor
Dc to dc converters and pulse width modulation controllers are presented with compensation circuitry to mitigate discontinuous conduction mode (dcm) undershoot and continuous conduction mode offsets in inductor current emulation information by providing compensation signals proportional to the output voltage and the converter off time (toff) when the low side converter switch is actuated.. .
12/11/14
20140361744
 On-board battery charger for electric vehicles and control method thereof patent thumbnailOn-board battery charger for electric vehicles and control method thereof
An on-board battery charger is provided that senses a voltage value of power input from a charging facility when the charging facility is connected to charge the batteries and receives a pulse width modulation (pwm) signal of a current value of the power from the charging facility. In addition, the charger calculates an output voltage value to be output to the batteries using the sensed voltage value of the input power and an output current value to be output to the batteries using a duty value of the received pwm signal.
12/11/14
20140361733
 Charger and charging system patent thumbnailCharger and charging system
A charger and a charging system are provided. The charger includes: a rectifier, a transformer, a first diode, a capacitor, a voltage sampling feedback unit, a pulse width modulation (pwm) controller, a battery voltage feedback unit and a semiconductor switching component, where the battery voltage feedback unit is added in the charger to detect battery voltage of a terminal, and the detected battery voltage of the terminal is fed back to a voltage sampling feedback unit inside the charger, so that the voltage sampling feedback unit can adjust an output voltage of the charger in real time according to an actual battery voltage of the terminal, and therefore, the output voltage of the charger gradually rises along with an increase of the battery voltage of the terminal, thereby effectively reducing energy consumption of the charger and achieving a purpose of energy saving..
12/11/14
20140361713
 Pulse width modulation control of solenoid motor patent thumbnailPulse width modulation control of solenoid motor
A drive mechanism configured to drive a thermally isolated actuator between two positions. The drive mechanism includes a rotary actuated motor configured to rotatably drive a motor member, and a drive member coupled to the motor member and having a drive arm configured to responsively move from a first position to a second position upon rotation of the motor member.
12/04/14
20140358138
 Gain compensation for a full bridge inverter patent thumbnailGain compensation for a full bridge inverter
An electrosurgical generator and related systems and methods using a gain-compensated full bridge topology. Gain nonlinearity is corrected by applying impedance and phase correction factors to a control loop to achieve a linear gain structure.
11/27/14
20140347008
 Wireless power transmitter and wireless power transfer method thereof patent thumbnailWireless power transmitter and wireless power transfer method thereof
A wireless power transmitter including a power supply unit configured to supply an input voltage; a power conversion unit configured to generate wireless power based on a driving signal, generated by the supplied input voltage and a first pulse width modulation (pwm) signal, and transfer the wireless power to a wireless power receiver; and a power transmission control unit configured to receive a voltage value of a battery charged with the wireless power through a wireless network, and generate the first pwm signal based on the voltage value of the battery.. .
11/27/14
20140346995
 Predictive pulse width modulation for an open delta h-bridge driven high efficiency ironless permanent magnet machine patent thumbnailPredictive pulse width modulation for an open delta h-bridge driven high efficiency ironless permanent magnet machine
Embodiments of the present method and system permit an effective method for determining the optimum selection of pulse width modulation polarity and type including determining machine parameters, inputting the machine parameters into a predicted duty cycle module, determining the optimum polarity of the pulse width modulation for a predicted duty cycle based on a pulse width modulation generation algorithm, and determining the optimum type of the pulse width modulation for a predicted duty cycle based on the pulse width modulation generation algorithm.. .
11/27/14
20140345635
Compositions, devices, and methods for nicotine aerosol delivery
The present disclosure generally relates to compositions, and related devices and methods, useful in vaporizing devices such as electronic cigarettes. The composition may comprise nicotine, at least one solvent, and at least one ion pairing agent, and may be vaporized to form a condensation aerosol, wherein inhalation of the aerosol allows for deposition of nicotine with the respiratory system, including deep lung deposition.
11/20/14
20140343393
Sensing system and method for physiology measurements
A sensing system for physiology measurements comprises a transmission end including a measuring signal generating module having at least one overshoot and undershoot wave generating circuits and a transmitting antenna module having at least one transmitting antenna; a receiving end having a plurality of receiving antennae with each receiving antenna receiving a reflected signal reflected by a target object; and a plurality of signal analyzing modules to generate a plurality of object active state signals by analyzing the reflected signal from each receiving antenna and transmit the plurality of object active state signals to a digital signal processor. Wherein each overshoot and undershoot wave generating circuit generates a measuring signal with overshoot and undershoot waves according to an inputted pulse width modulation signal, and each transmitting antenna emits the measuring signal to the target object..
11/20/14
20140340064
Power converter and operating method thereof
A power converter is disclosed. The power converter includes a comparator and a timing generator.
11/13/14
20140334187
Current source inverter and operation method thereof
A current source inverter includes a controller, an input unit, a buffer unit, a modulating unit, and a commutator. The controller generates a switch control signal, an inverse switch control signal, a first pulse width modulation control signal, and a second pulse width modulation control signal.
11/13/14
20140333859
Backlight driving board and lcd device
The present invention discloses a backlight driving board for driving a backlight source, comprising a microprocessor and a constant current driver chip. The microprocessor receives a display mode switching signal and a synchronization signal from a liquid crystal driving board, and generating a first pulse width modulation signal corresponding to the backlight source according to the display mode switching signal and the synchronization signal.
11/13/14
20140333450
Conditionally variable strobe notification appliance
A strobe notification device that operates based on a sensed environmental condition is disclosed. The strobe notification device includes a programmed candela setting, programmed locally at the strobe notification device or programmed remotely and sent to the strobe notification device.
11/13/14
20140333273
Thermal balance conversion circuit
A thermal balance conversion circuit includes a voltage conversion circuit, a temperature detection circuit, a pwm controller, and a signal integration controller. The voltage conversion circuit includes a plurality of voltage conversion units, and each of the voltage conversion units converts the dc voltage of a external power to a driving voltage.
11/13/14
20140333242
Systems and methods for adaptive motor speed control
A system including memory to store a plurality of sets of values, where each set is used to control speed of a different type of motor. A pulse width modulation (pwm) module receives an input indicating a type of motor sensed in the system, selects a set corresponding to the type of the sensed motor, and generates, based on the selected set, a pulse width modulation signal to control speed of the sensed motor.
11/06/14
20140328099
Control circuit for power converter and method thereof
A control circuit for a power converter includes a pulse width modulation signal generating circuit, a power estimation circuit, and a current limiting signal generating circuit. The pulse width modulation signal generating circuit generates pulse width modulation signals according to a current sense signal and a current limiting signal for configuring the conduction status of a switch circuit of the power converter.
11/06/14
20140328086
Activation apparatus and method for activating a direct voltage converter
The invention relates to an activation apparatus (20) for a galvanically decoupled direct voltage converter having a synchronous rectifier, comprising a signal generating device (22), which is designed to generate control signals (22c, 22d) for switch devices of the synchronous rectifier and a reference current signal (22b), a first comparator device (23), which is coupled to the signal generating device (22), and which is designed to detect the secondary-side output current (jo) of the synchronous rectifier, compare it to the reference current signal (22b) and generate a current control signal in dependence on the comparison, and a pulse width modulation device (25), which is coupled to the signal generating device (22) and the first comparator device (23) and which is designed to generate pulse width modulated activation signals (25a) for the switch devices of the synchronous rectifier on the basis of the control signals (22c, 22d) and the current control signal, wherein the signal generating device (22) is furthermore designed to reduce the reference current signal (22b) within a first predetermined timespan to a predetermined reference current threshold.. .
10/30/14
20140320086
Power converter having reduced switching transients
A power converter having reduced switching transients includes a conversion inductance, a pulse width modulation (pwm) controller, a conversion inductance, and a switch transistor. A low pass filter is connected between the pwm controller and the switch transistor to filter a pwm signal produced by the pwm controller and produce a filtered pwm signal.
10/30/14
20140320035
Electronic device with led
An electronic device comprises a control unit, a power supply, a switch unit, a driving unit, and an illumination unit. The control unit generates a pulse width modulation (pwm) signal with a first level signal and a second level signal.
10/23/14
20140313799
Power transforming apparatus
A power transforming apparatus implements a transformation of an energy signal and comprises a control unit, a pulse width modulation (pwm) unit, a transformation unit, and a slope compensation unit. The control unit outputs a target power signal.
10/23/14
20140312858
Power supply circuitry and adaptive transient control
A control circuitry can be configured to receive an error signal indicating a difference between an output voltage of the power supply and a desired setpoint for the output voltage. According to one configuration, depending on the error signal, the control circuitry initiates switching between operating the control circuitry in a pulse width modulation mode and operating the control circuitry in a pulse frequency modulation mode to produce an output voltage.
10/23/14
20140312789
Optimal trajectory control for llc resonant converter for led pwm dimming
Pulse width modulation is provided for controlling a resonant power converter, particularly for dimming of light emitting diode arrays without loss of efficiency. Dynamic oscillation due to the beginning of a pulse width modulated pulse burst is limited by shortening of the first and/or last pulse of a pulse bust such that the first pulse of a subsequent pulse burst close to or to connect with a full load steady-state voltage/current trajectory of the power converter.
10/16/14
20140307011
Systems and methods for display systems having improved power profiles
Techniques are provided to provide various pulse width modulation (pwm) schemes to embodiments of dual modulator display systems that may comprise a backlight of individually addressable and controllable light emitters. The backlight provides illumination to a light modulator for further conditioning of the light to be presented to a viewer.
10/16/14
20140306683
Adaptive digital pulse width modulation generator for buck converters
Systems and methods are disclosed to control a buck converter by performing adaptive digital pulse width modulation (adpwm) with a plurality of upper power transistors each uniquely controlled to enable greater than 100% duty cycle for the buck converter and a lower power transistor coupled to the plurality of upper power transistors; and driving an inductor having one end coupled to the lower power transistor and the upper power transistors.. .
10/16/14
20140306630
Method for controlling a motor using pulse width modulation (pwm)
A method controls a motor using pulse width modulation (pwm). The method involves measuring the pwm frequency; determining the carrier frequency of a set radio transmitter; and matching the pwm frequency to the carrier frequency of the radio transmitter in such a manner that an integer multiple of the pwm frequency corresponds to the carrier frequency or an integer multiple of the pwm frequency lies in the middle between two carrier frequencies..
10/09/14
20140300427
Lookup table assisted pulse width modulation
Embodiments are directed to modulating a pulse width modulation (pwm) signal, by initializing at least one phase index to an initial value, establishing a set of values in a lookup table that correspond to data points for pwm comparator values that correspond to a given number of samples of a single periodic waveform during a predetermined sampling rate that establishes a table resolution, repeatedly executing the following operations at the predetermined sampling rate: determining a value of a command signal frequency, setting a value to a jump factor equal to the quotient of the value of the command signal frequency divided by the table resolution, progressing the value of the phase index by the value of the jump factor, selecting a value of a commutation vector from the lookup table that corresponds to the phase index, and loading the value of the commutation vector into a corresponding pwm comparator.. .
10/09/14
20140300326
Electronic device with a duty cycle estimator
A circuit in an electronic device coupled to a battery via a first pair of switches includes a logic unit and a filter. The logic unit receives a pulse width modulation (pwm) signal and a first signal, and generates a second signal according to the pwm signal and the first signal.
10/09/14
20140300300
Method for controlling a brushless electric motor
The invention describes a method for controlling a sensorless, brushless dc motor that is controlled via a bridge circuit preferably using pulse width modulation (pwm) having precommutation. According to the invention, in the braking operation each commutation interval is divided into two phases.
10/09/14
20140300284
Color tunable light source module with brightness and dimming control
Led-based light source modules can incorporate color tunability and brightness control, allowing a user to select a desired color temperature and/or brightness and to change either or both dynamically. An emitter can include multiple independently addressable groups of leds, each emitting light of a different color.
10/09/14
20140300283
Color tunable light source module with brightness control
Led-based light source modules can incorporate color tunability and brightness control, allowing a user to select a desired color temperature and/or brightness and to change either or both dynamically. An emitter can include multiple independently addressable groups of leds, each emitting light of a different color.
10/02/14
20140293661
Ac/dc converter with galvanic insulation and signal corrector
An ac/dc converter comprising an input rectifier circuit connected in series with a primary winding (5) of an isolating transformer (6) and to a chopper switch (t1) driven by a control circuit (10) using pulse width modulation on the basis of a signal representative of a primary current, the isolating transformer having a first secondary winding (7) that is wound in the same direction as the primary winding and that is connected to an output line (8) of the converter via a diode (d4) and a filter coil (l1), and a second secondary winding (9) that is wound in the opposite direction to the primary winding and that is connected directly to the output line via a diode (d2), the output line being connected to an output capacitor (cout). The converter includes an analog correction circuit for correcting the primary current, which circuit is connected to the control circuit and to a measurement element (30) delivering a signal representative of the primary current, and is arranged to transform said signal into a triangular signal suitable for driving the control circuit..
10/02/14
20140291506
Nonradioactive ionization source driver
System and method for operating an ionizer using a combination of amplitude modulation and pulse width modulation to control the plasma temperature and the type of ions needed for analytic equipment. Ion density can be controlled by the repetition rate.
09/25/14
20140285168
Adjustable voltage output device and adjustment method of operating voltage
This disclosure relates to an adjustable voltage output device and an adjustment method of an operating voltage, in which the adjustable voltage output device utilizes a basic input/output system for adjusting the duty cycle of the pulse width modulation (pwm) signal outputted by the pwm signal generation unit, so as to change the operating voltage outputted by the voltage generation unit.. .
09/18/14
20140281593
Partitioned switch mode power supply (smps) interface
A single-wire interface of an application processor that communicates with another single-wire interface of a power management unit (pmu) via a control signal line. The control signal line can be a single signal path.
09/18/14
20140276569
System and method for detecting presence of an infusion cartridge in an infusion pump
Infusion devices, systems, and methods can detect a presence or absence of an infusion cartridge in an infusion pump. Embodiments may include a loading sequence, recording loading pulse width modulation (pwm) commands applied to an infusion pump motor during the loading sequence, setting a value of threshold pwm commands based on the commands applied during the loading sequence and comparing values of operational pwm commands applied during pumping operations to the value of the threshold pwm commands.
09/18/14
20140271236
Fan driving circuit
A fan driving circuit drives a first fan and a second fan which are connected in parallel and connected to an anode of a direct current power. The fan driving circuit includes a pulse width modulation signal generation module, a phase lock and delay module, a first pulse output comparator and a first capacitor.
09/18/14
20140268954
Methods and apparatus for continuous and discontinuous active rectifier boost operation to increase power converter rating
Power conversion systems and operating methods are presented in which an active front end rectifier is operated in a boost mode using discontinuous pulse width modulation in a first range of dc bus voltage boost amount, and continuous space vector pulse width modulation is used in a second range, with the ranges being correlated to output derating with respect to filter inductor magnetics in the first range and to rectifier switching loss derating and the second range.. .
09/18/14
20140268902
Single stage boost-asymmetric llc
An ac/dc power converter utilizing a single stage boost-asymmetric llc topology is disclosed. The converter uses a combined pulse width modulation (pwm) and frequency modulation (fm) to achieve dual control for a single main magnetic element (transformer).
09/18/14
20140268890
Wide output voltage range switching power converter
A switching power converter includes a voltage source that provides an input voltage vin to an unregulated dc/dc converter stage and at least one buck-boost converter stage to produce a desired output voltage vout. The unregulated dc/dc converter stage is adapted to provide an isolated voltage to the at least one regulated buck-boost converter stage, wherein the unregulated dc/dc converter stage comprises a transformer having a primary winding and at least one secondary winding and at least one switching element coupled to the primary winding.
09/18/14
20140267453
System and method for pulse width modulating a scrolling color display
A method of organizing and ordering pulse width modulation image data is disclosed, so that it may be displayed on the pixels of a scrolling color display. The method includes a method of formatting received image data into a different form suitable for driving a pulse width modulated display and a method of distributing image data across a series of different image modulation segments to minimize flicker and gray scale errors.
09/18/14
20140266489
Pulse width modulation signal generator
An embodiment of pulse width modulated (pwm) signal generator includes a module or modules to calculate an amount of change in a period length and duty ratio of an output signal during a transition period between a first signal waveform and a second signal waveform using a first period parameter, a second period parameter, and a parameter indicating a predetermined number of steps in the transition period. The period parameter and duty parameter of the output signal during the steps of the transition period are based on the calculated amounts of change..
09/18/14
20140266488
Pulse width modulation (pwm) utilizing stored signals having stochastic characteristics
A system and method for generating a digital pulse width modulation (pwm) control signal for a power transfer device that includes providing a digital pwm signal having a stochastic characteristic and control information, storing one or more of the digital pwm signals and retrieving the signal from the storage device to determine the output of a power transfer device. The stored digital pwm signals exhibit selected frequency domain characteristics after being configured and preselected to minimize undesirable characteristics such as harmonic signatures, audible noise, component vibration, and frequency-domain energy peaks..
09/18/14
20140266136
Hybrid digital pulse width modulation (pwm) based on phases of a system clock
Pulse width modulation (pwm) based on selectable phases of a system clock may be implemented with respect to leading-edge-modulation (lem), trailing-edge-modulation (tem), and/or dual-edge-modulation. An initial pulse may be generated based on a duty command, synchronous with the system clock, and may be registered with a d flip-flop under control of a selected phase of the system clock.
09/18/14
20140266133
Power converting circuit and control circuit thereof
A power converting circuit includes an upper gate switch, a transistor, a current source circuit, a comparator circuit, a delay circuit, and a pulse width modulation signal generating circuit. The transistor and the current source circuit provide a reference signal.
09/18/14
20140266121
Device for controlling a switching mode power supply
An apparatus for controlling an output voltage of a switching mode power supply (smps) by adjusting a switching duty ratio is provided. A comparator outputs a state signal varying depending on a comparison result between an output voltage of the smps and a reference voltage.
09/18/14
20140265964
Three phase brushless dc motor sensor-less control using sinusoidal drive method and apparatus
Back electromotive force (bemf) of a brushless dc (bldc) motor may be determined when using continuous sinusoidal drive by computing the voltage to common (ground) of each phase (3) thereof when a phase current is substantially zero. These phase voltages may be computed from the dc supply voltage and the duty cycle of the pulse width modulation (pwm) drive to each of the motor phases.
09/18/14
20140265963
Method of controlling start-up noise in bldc (brushless direct current) fan motors
A method to reduce acoustic noise in a cooling fan motor is disclosed. The method includes reducing the slew rate of a pwm (pulse width modulation) voltage waveform applied to energize a coil of the fan motor.
09/18/14
20140265588
Ac battery employing magistor technology
A dc/ac converter incorporates at least one magistor module having a first sp control switch, a second sz control switch and a third sm control switch. An ac source is connected to an input of the at least one magistor module.
09/11/14
20140257607
Transmission oil pressure control during engine autostart
A vehicle includes an engine having autostart functionality, a source of fluid pressure when the engine is off, a flow control solenoid that outputs a variable clutch pressure, a transmission, an electric motor, and a controller. The transmission includes a clutch in fluid communication with the solenoid.
09/11/14
20140253084
Power converter control circuit
A power converter control circuit includes a feedback circuit and a pulse width modulation signal generating circuit for configuring a power stage circuit to provide power to a load. The feedback circuit generates a first gain signal and a second gain signal according to an output voltage sensing signal coupled with the load.
09/11/14
20140253005
Thermal stress reduction in aircraft motor controllers
A thermal stress reduction method includes ramping an electric power generator to start an aircraft engine, for a time period associated with the aircraft engine start sequence toggling a three-level inverter switch array to a three-level pulse width modulation mode, determining if a first time interval in the three-level pulse width modulation mode exceeded a predetermined three-level pulse width modulation mode interval, in response to the first time interval exceeding the three-level pulse width modulation mode interval, toggling the three-level inverter switch array to a two-level pulse width modulation mode, determining if a second time interval in the two-level pulse width modulation mode exceeded a predetermined two-level pulse width modulation mode interval and in response to the second time interval exceeding the two-level pulse width modulation mode interval, toggling the three-level inverter switch array to the three-level pulse width modulation mode.. .
09/11/14
20140252995
Motor controller
The present invention provides a motor controller for controlling a dc motor according to a reference signal. The motor controller includes a compensator, a pulse width modulation unit, and a motor driving unit.
09/11/14
20140252966
Current split circuit for equally splitting current between parallel connected led luminaire strings
A system and method for equally splitting the current supplied to parallel connected strings of leds. The system and method includes a current splitting circuit such as a mirror circuit that divides the current substantially equally between two or more parallel connected strings of leds.
09/11/14
20140250910
Thermal stress reduction in aircraft motor controllers
A thermal stress reduction method includes ramping an electric power generator to start an aircraft engine, for a time period associated with the aircraft engine start sequence toggling a three-level inverter switch array to a three-level pulse width modulation mode, determining if a first time interval in the three-level pulse width modulation mode exceeded a predetermined three-level pulse width modulation mode interval, in response to the first time interval exceeding the three-level pulse width modulation mode interval, toggling the three-level inverter switch array to a two-level pulse width modulation mode, determining if a second time interval in the two-level pulse width modulation mode exceeded a predetermined two-level pulse width modulation mode interval and in response to the second time interval exceeding the two-level pulse width modulation mode interval, toggling the three-level inverter switch array to the three-level pulse width modulation mode.. .
09/04/14
20140247627
Converter and method
In accordance with an embodiment, a method for controlling a circuit includes controlling pulse width modulation on a primary side of a quasi-resonant controller to achieve continuous current mode operation from a synchronous rectification controller on a secondary side.. .
09/04/14
20140246990
Lighting device and lighting control method
A lighting device may be provided that includes: a first to a fourth light emitting devices which are disposed on a substrate a first and a second pulse width modulation controllers which perform a pulse width modulation on currents applied to the first and the second light emitting devices respectively; and a first and a second controllers which control respectively currents applied to the third and the fourth light emitting devices having color temperatures different from those of the first and the second light emitting devices, wherein an (x, y) coordinate, which is determined by the mixture of the lights emitted from the first to the fourth light emitting devices and is located within a 1931 cie chromaticity diagram, is moved onto a black body radiation curve within the 1931 cie chromaticity diagram through the pulse width modulation of the first and the second pulse width modulation controllers and the control of the first and the second controllers.. .
08/28/14
20140240380
Driving device, display device including the driving device, and driving method of the display device
A driving device includes a memory configured to store an initial setting value to drive a display, a power source controller configured to output a pulse width modulation (pwm) signal controlling power applied to the display, and a switching unit configured to connect an input and output port to the memory when writing data to a memory and configured to connect the power source controller to the input and output port when driving the display.. .
08/28/14
20140240020
Configurable time delays for equalizing pulse width modulation timing
A plurality of pwm generators have user configurable time delay circuits for each pwm control signal generated therefrom. The time delay circuits are adjusted so that each of the pwm control signals arrive at their associated power transistors at the same time.
08/28/14
20140239850
Backlight dimming circuit, dimming method of the same and liquid crystal display thereof
The present invention provides a backlight dimming circuit, a dimming method of the same and a liquid crystal display thereof. The backlight dimming circuit comprises a power supply voltage terminal vcc, which is used to provide supply voltage; an operational amplifier q, the noninverting input terminal of which connected with the power supply voltage terminal vcc, and the inverting input terminal of which connected with a load terminal; a precision resistor r, which is connected between the noninverting input terminal and the inverting input terminal of the operational amplifier q, the voltage differential signal across the precision resistor r being converted and amplified to a dc voltage signal by the operational amplifier q and outputting; and a comparator c, the noninverting input terminal of which receiving the dc voltage signal output from the operational amplifier q, and the inverting input terminal of which receiving a sawtooth signal from a boost ic in a boost converter, which is used to compare the dc voltage signal with the sawtooth signal of the boost ic and then outputting a pulse width modulation dimming signal according the comparison results.
08/28/14
20140238054
Multiple evaporator control using pwm valve/compressor
A refrigeration system including a condenser; a (single) linear compressor that is activated and deactivated by a pulse width modulation switching device; a pulse width modulation refrigerant flow switch; at least two evaporators operably connected in parallel with one another with at least one evaporator associated with the refrigerator compartment that operates at a first refrigerant fluid pressure and with at least one other evaporator associated with the freezer compartment that operates at a second refrigerant fluid pressure; and a plurality of refrigerant fluid conduits operably connecting the condenser, the linear compressor and the evaporators into a refrigerant fluid flow circuit and such that the evaporators are capable of running simultaneously at different pressure levels and refrigerant flows from the evaporators, to the pulse width modulation refrigerant flow switch and through the pulse width modulation refrigerant flow switch.. .
08/21/14
20140232367
Switching regulator control method
A control method for preventing an output voltage of a buck switching regulator from falling when an input voltage of the buck switching regulator falls includes: converting the input voltage into a charging current; determining a duty cycle of the buck switching regulator according to the charging current and the output voltage; and adjusting a switching frequency of a pulse width modulation signal in the buck switching regulator when the input voltage falls to a specific voltage and an off time of the pulse width modulation signal reaches a minimum value, in order to change the duty cycle to prevent the output voltage from falling.. .
08/14/14
20140229755
Pulse width modulation load share bus
Power supply modules have outputs coupled in parallel and convey load share balancing information over a single wire load share bus. Pulse width modulation (pwm) signals represent output loading of each of the power supply modules over the single wire load share bus.
08/14/14
20140226709
Method for generating a digital signal
A method is provided for generating a digital signal (ds) from an analog signal (ia, ua) generated by a frequency converter on the basis of pulse width modulation, wherein the digital signal corresponds to a mean value of the analog signal over a period of the pulse width modulation. The method includes the acts of: generating a bit stream (bs(i)) with a predetermined bit repetition duration (bw) depending on the analog signal by way of a sigma-delta modulator (1) and, during a time interval which has a duration which is at least as great as the period of the pulse width modulation: multiplying a respective bit (bs(i)) of the bit stream by a corresponding rating coefficient (bk(i)) for generating a respective bit/rating coefficient product and summing the respective bit/rating coefficient products, wherein the sum represents the digital signal..
08/14/14
20140226379
Method and apparatus for chaotic democratic pulse width modulation generation
An apparatus, method and system for operating a power converter of a plurality of serially connected power converters coupled using chaotic democratic control includes: a dc voltage module generating a set current value for the power converter to bias a dc source at a set point voltage and a switching controller. The switching controller determining an upper threshold and lower threshold based on the set current value, and comparing a system current value to the upper and lower thresholds to determine an operating state of the power converter, where the system current is generated by the plurality of converters..
08/14/14
20140225584
Switching power supply circuit
A switching power supply circuit is disclosed in an embodiment. The switching power supply circuit includes a power output stage, a pulse width modulation (pwm) signal generator, a compensation module, and a overshooting protection module.
08/07/14
20140218990
Power factor correction device and correcting method thereof
A power factor correction device comprises a power stage circuit converting input alternating current voltage into input current according to a pulse width modulation signal and outputs the input current to a load generating output voltage on the load, and sampling the input current outputting a correcting current; a current compensating circuit receiving and comparing the correcting current with a reference current signal generating a compensating current signal; a voltage compensating circuit receiving and comparing the output voltage with a reference voltage generating a compensating voltage signal; a multiplication amplifier receiving the compensating current signal and the compensating voltage signal generating an updated reference current signal by multiplying the compensating current signal with the compensating voltage signal; and a pulse width modulation converter receiving the compensating current signal and the compensating voltage signal generating the pulse width modulation signal to synchronize phase of alternating current voltage and input current.. .
08/07/14
20140218975
Power conversion system with adjustable frequency
A power conversion system with adjustable frequency includes an electric transformer, a pulse width modulation driving controller, a switching transistor, a first and second voltage division resistors connected in series, an output diode and an output capacitor. The electric transformer receives the input power and generates the sensing current and induced current.
08/07/14
20140218125
Digital pulse width modulation controller
A digital pulse width modulation controller includes a pulse width modulation controller, a selection unit having at least one selector, a comparison unit having at least one comparator, and a signal conversion unit having at least one digital-to-analog converter. The digital-to-analog converter generates a reference current and/or voltage.
08/07/14
20140218002
Power system and control method thereof
The present invention provides a power system and controlling method thereof. The power system includes: pulse width modulation (pwm) power source, voltage detection unit, current detection unit and feedback signal generation unit.
08/07/14
20140218000
Voltage regulator circuit
A voltage regulator circuit includes a soft start module, a pulse width modulation (pwm) module, and a voltage regulator module. The soft start module is used to receive a current feedback voltage corresponding to an input current, and compare the current feedback voltage with a comparison voltage, so as to output a switching signal.


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Pulse Width Modulation topics: Pulse Width Modulation, Modulation, Bridge Inverter, Duty Cycle, Control Unit, Ion Source, Illumination Source, Constant Current Source, Level Shift, Motor Control, Buck Boost, Capacitive Touch Sensor, Transmitter, Capacitive Touch, Reference Voltage

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