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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


Electronic device with a duty cycle estimator

Electronic device with a duty cycle estimator

Method for controlling a brushless electric motor

Method for controlling a brushless electric motor

Method for controlling a brushless electric motor

Color tunable light source module with brightness and dimming control

Date/App# patent app List of recent Pulse Width Modulation-related patents
10/09/14
20140300427
 Lookup table assisted pulse width modulation patent thumbnailLookup 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 patent thumbnailElectronic 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 patent thumbnailMethod 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 patent thumbnailColor 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 patent thumbnailColor 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 patent thumbnailAc/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 patent thumbnailNonradioactive 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 patent thumbnailAdjustable 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 patent thumbnailPartitioned 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 patent thumbnailSystem 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.
08/07/14
20140217939
Apparatus and method of decreasing speed of sensorless brush less direct current (bldc) motor
Disclosed herein is an apparatus of a sensorless brush less direct current (bldc) motor capable of rapidly driving the bldc motor at a decreased speed. The apparatus includes: a switching unit configured to switch a direct current (dc) power depending on a plurality of pulse width modulation (pwm) signals to generate a three-phase alternating current (ac) power and apply the generated three-phase ac power to the bldc motor to drive the bdlc motor; a plurality of voltage dividers configured to divide voltages of reverse electromotive forces generated in the bldc motor; and a controlling unit configured to calculate a current rotation speed of the bldc motor using output signals of the plurality of voltage dividers, generate the plurality of pwm signals depending on the calculated current rotation speed and a command rotation speed and output the plurality of pwm signals to the switching unit, divide a rotation phase angle of the bldc motor into a speed decreasing region and a zero crossing point (zcp) detecting region in the case of decreasing a rotation speed of the bldc motor, decrease the rotation speed of the bldc motor in the case in which the rotation phase angle of the bldc motor is in the speed decreasing region, and detect zcps of the reverse electromotive forces in the case in which the rotation phase angle of the bldc motor is in the zcp detecting region.
08/07/14
20140216346
Plasma processing apparatus
A plasma processing apparatus includes a processing chamber including a dielectric window; a coil-shaped rf antenna, provided outside the dielectric window; a substrate supporting unit provided in the processing chamber; a processing gas supply unit; an rf power supply unit for supplying an rf power to the rf antenna to generate a plasma of the processing gas by an inductive coupling in the processing chamber, the rf power having an appropriate frequency for rf discharge of the processing gas; a correction coil, provided at a position outside the processing chamber where the correction coil is to be coupled with the rf antenna by an electromagnetic induction, for controlling a plasma density distribution on the substrate in the processing chamber; a switching device provided in a loop of the correction coil; and a switching control unit for on-off controlling the switching device at a desired duty ratio by pulse width modulation.. .
08/07/14
20140216345
Plasma processing apparatus
A plasma processing apparatus includes a processing chamber including a dielectric window; a coil-shaped rf antenna, provided outside the dielectric window; a substrate supporting unit provided in the processing chamber; a processing gas supply unit; an rf power supply unit for supplying an rf power to the rf antenna to generate a plasma of the processing gas by an inductive coupling in the processing chamber, the rf power having an appropriate frequency for rf discharge of the processing gas; a correction coil, provided at a position outside the processing chamber where the correction coil is to be coupled with the rf antenna by an electromagnetic induction, for controlling a plasma density distribution on the substrate in the processing chamber; a switching device provided in a loop of the correction coil; and a switching control unit for on-off controlling the switching device at a desired duty ratio by pulse width modulation.. .
07/31/14
20140214136
Pulse width modulation control for battery-powered laser device
A battery-powered laser-based dermatological treatment device may include a laser unit comprising at least one laser diode, a battery unit, at least one sensor configured to generate sensor signals, and a laser drive control system including a laser drive circuit comprising the laser unit, the battery unit, a first switch (e.g., a first fet), and a second switch (e.g., a second fet), wherein the laser unit is arranged in series between the first switch and the second switch, and control electronics configured to control the first switch based at least on sensor signals from the at least one sensor, and control the second switch using pulse width modulation (pwm), thereby delivering current from the battery unit to the laser unit with a pwm current waveform. The laser drive circuit may also include a snubber circuit configured to prevent voltage spikes upon the second switch being turned off..
07/31/14
20140211081
Driver circuit for a camera voice coil motor
A driver circuit for a camera voice coil motor (vcm) is described. A first power switch selectively conducts current from a vcm node to a power supply node, and a second power switch selectively conducts current from the vcm node to a power return node.
07/31/14
20140210697
Display circuitry with dynamic pixel backlight and backlight sloping control
A system may include a processor, a graphics controller, and a display. The graphics controller may generate video data to be presented on the display.
07/31/14
20140210534
Pulse width modulation signal generation circuit and pulse width modulation signal generation method
The present invention discloses a pwm signal generation circuit and a pwm signal generation method. The pwm signal generation circuit includes: a reference signal generation circuit for generating a reference signal according to an input voltage; a variable ramp signal generation circuit for generating a variable ramp signal; and a comparator circuit for comparing the reference signal with the variable ramp signal to generate a pwm signal.
07/24/14
20140204630
Current balance control for non-interleaved parallel bridge circuits in power converter
Systems and methods for reducing current imbalance between parallel bridge circuits used in a power converter of a power generation system, such as a wind driven doubly fed induction generator (dfig) system, are provided. The power converter can include a plurality of bridge circuits coupled in parallel to increase the output power capability of the system.
07/24/14
20140203743
Drive apparatus and drive method for brushless motor
The present invention relates to a drive apparatus that drives a brushless motor with a square wave, and relates to a drive method thereof. The drive apparatus limits a duty cycle of once in n times of pulse width modulation periods so that the duty cycle does not fall below a set value, and increases the n value according to a rotation speed of the brushless motor, and then obtains position information in a period in which the duty cycle is limited to the predetermined duty cycle.
07/17/14
20140201559
Control system and method for fans
A control system comprises a power distribution unit (pdu), a number of fan modules, a processing module, and a storage module. The pdu comprises a number of power-output terminals.
07/17/14
20140197854
Resistance determination for temperature control of heated automotive components
Electrical resistance of a heated component is determined for temperature control and monitoring. A voltage-representation signal, which is proportional to a voltage across a heater component, is received.
07/17/14
20140197810
Multi-phase dc-dc converter and controlling method thereof
A multi-phase dc-dc converter and a controlling method thereof are provided. The multi-phase dc-dc converter includes a plurality of output units, a sensing unit, and a pulse width modulation (pwm) controller.
07/17/14
20140197765
Methods and apparatuses for controlling output voltages of inverters driving of electric motors
A method of controlling an output voltage of an inverter driving an electric motor may include removing harmonic components of an output current, which is output to the electric motor, by using a low pass filter and obtaining a fundamental component of the output current; calculating a current total harmonic distortion by using the fundamental component of the output current; comparing the current thd with a reference current thd; determining a pulse width modulation method to be changed from a first modulation method for reducing the harmonic components of the output current to a second modulation method for reducing a switching frequency of the inverter if the current thd is less than the reference current thd, the pwm method modulating a pulse width of a control pulse signal for controlling the output voltage of the inverter; and/or generating the control pulse signal based on the determined pwm method.. .
07/10/14
20140192568
Inverter for a distributed power generator
Provided is a maximum power point (mpp) tracker for a pv cell inverter, and a pv cell inverter. The mpp tracker decouples output power oscillations from the input power generation and extracts maximum available power from the pv cell.
07/10/14
20140191743
Current mode control arrangement and method thereof
Control circuitry for providing a control signal in a pulse width modulating regulating power converter wherein an output parameter delivered by the converter is regulated by pulse width modulation of current within the converter, including circuitry for receiving a sensed output parameter of the converter; circuitry for deriving therefrom an analog average current demand signal corresponding to a current that would bring the converter into regulation; circuitry for receiving a sensed present value of the current within the converter to provide an analog signal representative thereof; circuitry for differencing the average current demand signal and the analog signal to provide an error signal; a compensator arranged to average the error signal to provide a second error signal; a sawtooth generator providing an analog signal as a pulse width modulation ramp; and a comparator to which the ramp is applied to generate the control signal at the output thereof.. .
07/10/14
20140191681
Circuitry for current regulated, externally controlled led driving
A current driver circuit for regulating a light emitting diode (led) is disclosed. An example driver circuit uses one input node of the driver circuit for controlling both maximum brightness and dimming of an led coupled to an output node of the driver circuit.
07/03/14
20140188424
Fan test device
A fan test device is connected to an interface of a fan under test on a motherboard. The fan test device includes a connector, a power test unit, a signal test unit, a single chip microcontroller (scm), and a keyboard.
07/03/14
20140185836
Pulse width modulator and switching amplifier
A pulse width modulation signal with a less distortion component that is not influenced by a common-mode noise or an offset voltage is generated. Pulse signal generation circuits 6, 7 generate pulse signals s1, s2 whose pulse widths are discharge times t1, t2 of integrators 3, 4, respectively, a pwm signal generation circuit 8 detects discharge end timings of the integrators 3, 4 based on the pulse signals s1, s2, and a pulse whose pulse width is a time between discharge end timing of one of the integrators 4 and discharge end timing of the other one of the integrators 3 is generated so as to be output as a pwm signal spwm..
07/03/14
20140185335
Power converter system with synchronous rectifier output stage and reduced no-load power consumption
A power converter circuit may convert alternating current signals into direct current signals. A load may be powered from output terminals that are provided with the direct current signals.
07/03/14
20140184485
Backlight driver of liquid crystal display device and method of driving the same
A backlight driver and a method of driving the same are disclosed. The backlight driver includes a vertical synchronization signal filter for generating a second vertical synchronization signal based on an input first vertical synchronization signal, and selecting one of the first vertical synchronization signal and the second vertical synchronization signal as a third vertical synchronization signal according to whether a period difference between adjacent first vertical synchronization signals satisfies a preset threshold range, a duty ratio detector for detecting a duty ratio of an input pulse width modulation (pwm) signal, a pwm generator for generating an output pwm signal synchronized with the third vertical synchronization signal output from the vertical synchronization signal filter and having the duty ratio and outputting the output pwm signal to a backlight unit..
07/03/14
20140184126
Fan control circuit
A fan control circuit includes a hardware controller, a rectifier circuit, first to third electronic switches, and a fan. When the hardware controller outputs a pulse width modulation (pwm) signal to the rectifier circuit and the fan, the rectifier circuit transforms the pwm signal into a direct current (dc) voltage and outputs the dc voltage to the first electronic switch.
07/03/14
20140184124
Computing device and method for protecting fan of computing device
In a method for protecting a fan of a computing device, firstly, a current supplied to the fan is read. Secondly, if the current supplied to the fan is more than or equal to a predefined current, a baseboard management controller(bmc) is controlled to send a pulse width modulation (pwm) signal to decrease a duty cycle of the fan by a predefined proportion, so that the current supplied to the fan is decreased.
06/26/14
20140176103
Control method and control apparatus
A control method and a control apparatus are provided. The control method and apparatus are applied to a buck-boost topology.
06/26/14
20140176097
Multi-phase dc-dc power converter
A multi-phase dc-dc power converter is provided, which includes a pulse width modulation (pwm) controller and a plurality of output stage circuits. The plurality of output stage circuits converts an input voltage into an output voltage.
06/26/14
20140176091
Dc-dc controller and control method thereof
A dc-dc controller and a control method thereof are provided. The dc-dc controller is coupled to an output stage.
06/26/14
20140176032
Back electromotive force detection circuit, and motor driving control apparatus and motor using the same
There are provided a back electromotive force detection circuit, and a motor driving control apparatus and a motor using the same. The back electromotive force detection circuit includes: a voltage generating unit generating a voltage in inverse proportion to a duty ratio of a pulse width modulation (pwm) signal; a variable amplifier controlling a gain according to the voltage generated by the voltage generating unit, and amplifying back electromotive force according to the controlled gain; and a comparator comparing an output from the variable amplifier with a pre-set reference signal, and outputting a zero-crossing signal of the back electromotive force..


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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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