|| List of recent Duty Cycle-related patents
|Bias current control of laser diode instrument to reduce power consumption of the instrument|
Embodiments for driving a laser diode includes generating a bias current having a duty cycle that is less than 100%. The current level of the bias current is insufficient to turn on the laser diode.
|Clock signal error correction in a digital-to-analog converter|
In an example, there is disclosed herein a digital-to-analog converter (dac) including a correction circuit for a clock, including a differential clock. Error correction may take place within the dac core, by means of replica cells that are substantially similar to conversion cells.
|Method and apparatus for determining a target light intensity from a phase-control signal|
A dimmable ballast circuit for a compact fluorescent lamp controls the intensity of a lamp tube in response to a phase-control voltage received from a dimmer switch. The ballast circuit comprises a phase-control-to-dc converter circuit that receives the phase-control voltage, which is characterized by a duty cycle defining a target intensity of the lamp tube, and generates a dc voltage representative of the duty cycle of the phase-control voltage.
|Apparatus and method for wetting current measurement and control|
A voltage signal and a wetting current are received from a switching device. A first pulse train is created from the voltage signal and the first pulse train has a first duty cycle that is proportional to the voltage at the switching device.
|Pulse switched resistor driver|
Pulse switching controller for the led lighting of the led drive module for lamps in automobile applications provided with light sources having led diodes and a drive module for the led function and excitation, where the drive module (3) comprises at minimum one resistance regulator (38) working in pulse switching duty, which is connected by its input to the last cathode of the corresponding branch (33) of led diodes and by its output to the input electrode of a switching element (37), which is connected by its output electrode to ground, while the controlling electrode of the switching element (37) is connected to the output of a pulse generator (36) with a set duty cycle in dependence on the input voltage, which is connected both by a sensor input to the input voltage from the input circuit (31) and by an external input (35).. .
|Power stealing for a wireless-enabled thermostat|
Disclosed are exemplary embodiments of apparatus, systems and methods for power stealing for a wireless-enabled thermostat. In an exemplary embodiment, a wireless-enabled thermostat generally includes a control having a wireless network interface that intermittently connects the thermostat in a wireless network in accordance with a duty cycle, the duty cycle having a connect time in which the thermostat is connected in the wireless network and a sleep time in which the thermostat is not connected in the wireless network.
|Intelligent over-current prevention|
A system, method, and/or computer program product comprises an input/output (i/o) bus and an intelligent current bank that couples a voltage source to the i/o bus. The intelligent current bank includes an ammeter that measures a real-time flow of current to the i/o bus.
|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.. .
|External ramp autotuning for current mode control of switching converter|
Peak current, valley current or average current mode controlled power converters in either digital or analog implementations obtain a stabilized feedback loop and allow high system bandwidth design by use of an external ramp generator using a slope computation equation or design parameters based on fixing the quality factor of a double pole at one-half of the switching frequency at a desired value the slope of the external ramp waveform is tuned automatically with knowledge of the slope change in the waveform of inductor current of a power converter derived by differentiating a waveform in the current feedback loop. This autotuning of the external ramp generator provides immunity of quality factor change under variations of duty cycle, component values of topological change of the power converter..
|Intelligent over-current prevention|
A system, method, and/or computer program product comprises an input/output (i/o) bus and an intelligent current bank that couples a voltage source to the i/o bus. The intelligent current bank includes an ammeter that measures a real-time flow of current to the i/o bus.
|Controlling brightness of light sources used for data transmission|
A method includes receiving a transmitted code via visible light communication from a light source. The transmitted code is decoded using a translation table.
|Current detection circuit and switch regulator using the same|
In one embodiment, a current detection circuit configured to determine an input current and an output current of a switching regulator, can include: (i) a mirror circuit configured to mirror a current flowing through a main power transistor of the switching regulator to generate a sampling signal that is in proportion to the main power transistor current; (ii) a current generating circuit configured to perform a first average value calculation of the sampling signal based on a switching cycle of the switching regulator to determine the input current; and (iii) the current generating circuit being configured to perform a second average value calculation of the sampling signal based on a conduction duty cycle of the main power transistor to determine the output current.. .
|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.
|Control panel, control method thereof and clothes treating apparatus having the same|
Disclosed are a control panel provided on an apparatus to control the apparatus, a control method thereof, and a clothes treating apparatus having the control panel. The control method includes the actions of receiving, at a clothes treating apparatus, a power supply command through a power input unit; and based on receiving power to the control panel, controlling a target light emission unit located on a panel body of the clothes treating apparatus.
|Electrically actuated variable pressure controll system|
An electrically-actuated variable pressure control system for use with flow-controlled liquid application systems. Direct acting solenoid valves are pulsed at varying frequencies and duty cycles0000change the resistance to flow encountered by the flow-controlled liquid application system.
|Power converter and power conversion method|
A power converter includes a switching circuit, a power conversion circuit that receives an input voltage via the switching circuit and converts the input voltage into an output voltage, an input voltage sense circuit that detects the input voltage and generates an input voltage sense signal, and a pwm controller that adjusts a duty cycle of the switching circuit based at least in part on the input voltage sense signal. The power converter also includes an output sense circuit that detects the output voltage and generates an output voltage sense signal, wherein the pwm controller adjusts the duty cycle of the switching circuit based at least in part on the input voltage sense signal and the output voltage sense signal..
|Syncless unit interval variation tolerant pwm receiver circuit, system and method|
A pwm receiver circuit receives and demodulates pulse width modulated (pwm) data signals without requiring synchronization such that no synchronization preamble need be provided with the pwm data signal. Embodiments may consume less power since there is no need to repeatedly synchronize a pll, counter or other circuitry to the pwm data signal.
|Power amplifier saturation detection|
In a portable radio transceiver, a power amplifier system includes a saturation detector that detects power amplifier saturation in response to duty cycle of the amplifier transistor collector voltage waveform. The saturation detection output signal can be used by a power control circuit to back off or reduce the amplification level of the power amplifier to avoid power amplifier control loop saturation..
|Silent start class-d amplifier|
A class-d amplifier includes a pre-amplifier having an input configured to receive an amplifier reference voltage signal which is ramped at start-up at a fast rate. An integrator has a first input configured to receive an input signal from the pre-amplifier and a second input configured to receive an integrator reference voltage signal which is ramped at start-up at a slower rate.
|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.. .
|Method and system for monitoring the progressive charging of an automobile alternator, and automobile alternator comprising such a system|
The method according to the invention involves limiting the charging of a vehicle alternator by only authorizing progressive augmentation of a current duty cycle (dc) of an excitation signal (7) of the alternator from an initial duty cycle to an expected duty cycle (epsu) calculated by a control loop (1, 5, 6) of the alternator. According to the invention, a complementary limitation of the charging of the alternator involves limiting the increase of the current duty cycle (dc) according to at least one parameter of the heat engine involving an angular acceleration (mot) and/or a rotation speed (nmot) of the heat motor.
|Method and apparatus for regulating the brightness of light-emitting diodes|
Embodiments of the present invention relate to methods and circuits for brightness regulation for at least one light-emitting diode in the field of general lighting, more particularly, for incandescent lamp replacement by means of a supply voltage comprising a brightness level signal, wherein the brightness level signal contained in the supply voltage is decoded and converted into a modulation signal with a duty cycle corresponding to the brightness level signal for the purpose of driving a driver circuit for the at least one light-emitting diode.. .
|Efficient external charger for an implantable medical device optimized for fast charging and constrained by an implant power dissipation limit|
An external charger for a battery in an implantable medical device and charging techniques are disclosed. Simulation data is used to model the power dissipation of the charging circuitry in the implant at varying levels of implant power.
|Crest-factor control of phase-shifted inverter|
A method for controlling an electrosurgical generator includes generating at least one electrosurgical waveform at a selected energy setting through an rf output stage comprising an rf inverter coupled to a power source. The at least one electrosurgical waveform has a duty cycle and a crest factor.
|Device and method for improved safety and efficacy for cryoablation|
A method and system for improved lesion creation. The method generally includes positioning a treatment element of a medical device proximate an area of target tissue and operating a control unit in accordance with a duty cycle, that includes at least one freeze-warm cycle, each freeze-warm cycle including: supplying coolant to the treatment element at a first flow rate that causes the treatment element to reach a first temperature, the first temperature causing ablation of the target tissue and cryoadhesion between the treatment element and target tissue, and supplying coolant to the treatment element at a second flow rate that causes the treatment element to reach a second temperature, the second temperature being higher than the first temperature and the second flow rate being lower than the first flow rate, the second temperature being above a temperature at which ablation occurs and below a temperature at which cryoadhesion is broken..
|Low power audio trigger via intermittent sampling|
Systems and methods may provide for using an audio front end of a mobile device to sampled audio from an audio signal during a first portion of a periodic detection window, and reducing a power consumption of one or more components of the audio front end during a second portion of the periodic detection window. Additionally, a determination may be made as to whether voice activity is present in the audio signal based at least in part on the sampled audio.
|Pulsed line beams|
Processes such as annealing amorphous silicon to form polysilicon use exposures to pulsed laser beams provided by laser diodes or arrays of laser diodes. An optical beam based on plurality of beams from respective laser diodes is shaped and directed to a substrate.
|High sample rate dpes to improve contact detection signal to noise ratio|
Using a high sample rate dpes, together with pulsed heater and lock-in technique, to improve dpes snr for contact detection between the head and media surface. Steps of powering a transducing head actuator with pulsed input signal at a select data track offset from a previously-written to data track of the storage medium, where the pulsed input signal has select amplitude and duty cycle to simulate a response signal, and further locking in an amplitude with respect to the heater frequency, can lead to a determination of level of heater power for initiating contact between the transducing head and the storage medium..
|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).
|Inground device with advanced transmit power control and associated methods|
An inground housing supports a transmitter for receiving electrical power from a battery. The transmitter transmits at least one signal using at least two different transmit power levels for at least one of locating the transmitter and characterizing an orientation of the transmitter.
|Methods, systems and devices for electronic article surveillance deactivation having randomized transmission rates|
Methods, systems and devices for providing an interrogation signal from a handheld deactivation device for identifying a security tag. Identifying the security tag includes initiating an interrogation signal, wherein the interrogation signal includes plurality of transmission bursts and a plurality of random time periods to wait between transmission bursts such that a unique time period elapses between each of the plurality of transmission bursts.
|Digital duty cycle correction circuit|
A digital duty cycle correction circuit includes a duty cycle controller and a digital duty control code generator. The duty cycle controller generates first and second output clock signals by compensating duty cycles of first and second input clock signals based on a digital duty control code.
|Duty cycle correction circuit|
In an embodiment, a duty cycle correction circuit comprises a first set of inverters connected in series, a first filter, a first feedback circuit and a second feedback circuit. A first inverter in the series is configured to receive a clock signal and a last inverter in the series is configured to provide a first output clock signal.
|Duty cycle corrector|
The duty cycle corrector for correcting a system clock signal comprises a duty cycle detector and a duty cycle adjuster. The duty cycle detector is configured for detecting a system duty cycle of the system clock signal and generating the first control signal and the second control signal, wherein the first control signal and the second control signal are complementary to each other.
|Clock cycle compensator and the method thereof|
One aspect of the present invention is to provide a method for compensating a system duty cycle of a system clock signal. The method in one embodiment comprises the following steps: locking a duty cycle center of the system duty cycle by a delay lock loop; detecting a current system duty cycle of the system clock signal; determining a duty cycle correction amount, wherein the duty cycle correction amount is a gap of the current system duty cycle from a target duty cycle; and changing a polarity of an input reference clock signal according to whether the duty cycle correction amount exceed a threshold amount or not..
|Electrical power steering phase voltage output diagnosis|
A motor control diagnostic apparatus is provided. The apparatus includes a control module in communication with a multiple phase electric power steering motor, the control module configured to generate multiple phase duty cycle outputs based on a voltage command generated from a motor torque command and motor position.
|Method and system for regulating battery voltages in handheld/portable electronic systems|
A power supply circuit (1) for powering a load device (10) with the requirements of a high power burst at a low duty cycle. The power circuitry includes; a power source (2), a voltage comparator (3) which makes sure that the power source has enough power for the system, a series boost regulator (5) which delivers a higher voltage to the capacitor (7), a switching buck/boost regulator (8) which receives the voltage from the capacitor and regulates the higher or lower voltage to the load device..
|Systems and methods for 100 percent duty cycle in switching regulators|
The present disclosure includes systems and methods for 100% duty cycle in switching regulators. A switching regulator circuit includes a ramp generator to produce a ramp signal having a period and a comparator to receive the ramp signal and an error signal, and in accordance therewith, produce a modulation signal.
|Duty-cycle dependent slope compensation for a current mode switching regulator|
An electronic circuit may output a slope compensation signal for performance of slope compensation of a current mode switching regulator. The circuit may generate a voltage across a storage device that is supplied to a voltage-to-current converter, which may generate a first current in response to the supplied voltage.
|Method and implementation for eliminating random pulse during power up of digital signal controller|
A switching mode power converter includes a dsc with a digital pwm module configured for complementary operation mode during normal operation. The control algorithm of the dsc is configured such that during an initialization stage immediately following power up of the device relevant digital pwm modules used for interleaving operation are reconfigured to temporarily operate in an independent operation mode with the duty cycle associated with each channel set at zero.
|Sine modified trapezoidal drive for brushless dc motors|
A pulse width modulated (pwm) trapezoidal commutation drive to a brushless direct current (bldc) motor is sine modified so that the applied drive voltage substantially matches the induced voltage generated in the bldc motor. The values of the cosine of the angles between −30 degrees and +30 degrees are used to modify the duty cycle of the pwm drive signal dependent upon the rotor angular positions determined from the times between the zero crossing bemf voltages measured at the unconnected motor terminals..
|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.
|Lighting system with reduced physioneural compression and associate methods|
A system for generating light with reduced physioneural compression. The system includes a first light source operable to emit light within a first wavelength range corresponding to a first photoreceptor and a second light source operable to emit light within a second wavelength range corresponding to a second photoreceptor.
|Methods and apparatus for lighting effects in a moving medium|
A device for creating moving light effects has a light source that is configured to pulse a light on and off according to a desired pattern so as to create a moving light effect that is visible when the light source is moved. Some such devices can be programmed to custom-select color sets that are pulsed on and off according to the desired pattern.
|Multiple power outputs generated from a single current source|
A system includes a power converter that is configured to supply current to a plurality of output loads connected in series. At least one of the output loads is connected in parallel with a switch that switches in accordance with a duty cycle.
|Constant brightness led drive communications port|
A light emitting diode (led) is driven with a plurality of pulses having controllable pulse widths and positions within clock time periods that provide for both led light intensity control and digital information communications from a single output node of an integrated circuit (ic) device. The led light intensity is determined by the duty cycle of the pulses where the human eye integrates these light pulses from the led into continuous light intensity levels.
|Apparatus and method for controlling a pressure gain combustor|
A method of controlling operation of a pressure gain combustor comprises: determining a fuel injector duty cycle and a combustion frequency that meets a target load set point and a target fill fraction of the combustor; determining a fuel supply pressure setting, a fuel injector timing setting and an ignition timing setting that achieves the determined fuel injector duty cycle and combustion frequency; and sending a fuel supply pressure control signal with the fuel supply pressure setting to a fuel pressurizing means of the combustor, a fuel injector control signal with the fuel injector timing setting to a fuel injector of the combustor, and an ignition timing control signal with the ignition timing setting to an ignition assembly of the combustor.. .
|Modular high-frequency converter and method for operating the same|
A modular high-frequency converter includes submodules, each having an input-side half bridge and a dc link circuit with a dc link capacitance connected in parallel to the half bridge. A dc link circuit voltage drop across the dc link capacitance of each submodule is controlled to a target voltage by adjusting a duty cycle with a closed-loop control structure having a pilot control and a downstream closed-loop error control.
|Constant power inverter with crest factor control|
An electrosurgical generator is provided. The generator includes a dc-dc buck converter configured to output a dc waveform, the dc-dc buck converter including at least one first switching element operated at a first duty cycle; a dc-ac boost converter coupled to the dc-dc buck converter and including at least one second switching element operated at a second duty cycle, the dc-ac boost converter configured to convert the dc waveform to generate at least one electrosurgical waveform; and a controller coupled to the dc-dc buck converter and the dc-ac boost converter and configured to adjust the first duty cycle and the second duty cycle to operate the at least one electrosurgical waveform in at least one of constant current, constant voltage, or constant power modes..
|Controller for a power converter and method of operating the same|
A control system for a power converter with reduced power dissipation and method of operating the same. In one embodiment, the control system includes a first controller coupled to a primary winding of a transformer and configured to control a duty cycle of a power switch to regulate an output characteristic of the power converter.
|System for distributing auto-stereoscopic images|
A system for distributing auto-stereoscopic images, a parallax blocking mask and methods for producing a parallax blocking mask. A parallax blocking mask is provided as an “add-on” for an existing image display device having a flat panel type display screen.
|Multi-power mode reference clock with constant duty cycle|
A power management apparatus and method for maintaining a substantially constant duty cycle of a reference clock signal in a multi-power oscillator, includes a first output power transistor in electrical parallel with a series arrangement of a second output power transistor and a switch, and a crystal oscillator capacitively coupled to a common gate of the first and second output power transistors, wherein a level of the reference clock signal power output is a normal power level when the switch is open and the level of the reference clock signal power output is a higher power level when the switch is closed to operate the second output power transistor in parallel with the first output power transistor.. .
|Voltage level shifter with a low-latency voltage boost circuit|
Certain aspects of the present disclosure provide a voltage level shifting circuit employing a low latency, ac-coupled voltage boost circuit, as well as other circuits and apparatus incorporating such a level shifting circuit. Such level shifting circuits provide significantly lower latency compared to conventional level shifters (e.g., latency reduced by at least a factor of two).
|Differential amplifiers, clock generator circuits, delay lines and methods|
A differential amplifier may be configured to have a duty cycle and/or gain that is adjustable, such as by adjusting the switch points of circuitry in the differential amplifier. The differential amplifier may alternatively or additionally have a hysteresis function by, for example, using a signal feedback from the output of the amplifier to adjust the switch points of circuitry in the differential amplifier.
|Power supply with adaptive-controlled output voltage|
A power supply circuit includes a pre-regulator configured to receive an input voltage and to generate an output voltage, and a switching current regulator coupled to an output of the pre-regulator and configured to regulate a level of current supplied to an output load. The switching current regulator is controlled by a switching signal having a duty cycle.
|Multiple linked appliance with auxiliary outlet|
A combination microwave and refrigerator system is constructed having a single plug input supply. The microwave oven is adapted to provide power to a refrigerator, and to auxiliary receptacles adapted for low power operation.
|Method for operating a glow plug, and glow plug control device|
A method for operating a glow plug by means of pulse-width-modulated voltage pulses which are generated by controlling a load transistor, wherein a heating current flowing through the glow plug is measured and the duty cycle of the pulse-width-modulated voltage pulses is changed in accordance with values of the heating current. The heating current can be measured by means of a current measurement circuit, through which a sense current flows parallel to the load transistor, and the value of the heating current is calculated by multiplying a measured value of the sense current by a kilis factor, wherein the temperature of the current measurement circuit is measured and the kilis factor is defined in accordance with the measured circuit temperature.
|Photon modulation management system|
Embodiments described herein provide systems for optimizing organism growth, destruction or repair, by controlling the duty cycle, wavelength band and frequency of photon bursts to an organism, through the high frequency modulation of photons in an individual color spectrum to the organism, where the photon modulation is based upon the specific needs of the organism. Devices for the optimization of organism growth, destruction or repair through the high frequency modulation of photons of individual color spectrum to the organism are also provided.
|Universal transceivers and supplementary receivers with sparse coding technique option|
A transmitter is provided having a signal generator configured to generate a sparse code signal where the signal has a substantially small duty cycle of about 0.5% and substantially small pulse widths, with the distance between the pulses defined by the sparse code, and sufficiently low carrier signal level so that the signal can only be detected via a matched receiver.. .
|Wireless communication device power reduction method and apparatus|
A wireless communications power saving method and apparatus is provided. The method includes, when no reverse link traffic exists and no forward link traffic has been received for a predetermined amount of time, establishing, at a terminal, a reverse link transmission pilot signal duty cycle, and boosting overhead channel signal transmission power during on slots and gating overhead channel and pilot signal transmission power during off slots.
|Systems and methods for feed-forward control of load current in dc to dc buck converters|
A system for controlling load current in a voltage converter includes a current normalization module that receives a first measurement corresponding to the load current, receives a second measurement corresponding to an inductor current, and matches a first gain of the first measurement corresponding to the load current to a second gain of the second measurement corresponding to the inductor current to generate a normalized load current. A feed-forward generation module receives the normalized load current from the current normalization module and generates a load current feed-forward (lcff) signal based on the normalized load current.
A boost converter for converting between an input voltage and an output voltage is disclosed. The boost converter includes an inductor connected to the input voltage a switching arrangement for controlling the switching of the inductor current to an output load at the output voltage and a controller for controlling the switching arrangement to provide duty cycle control.
|Telemetry system with wireless power receiver and monitoring devices|
A wireless power receiver includes a rectifier coupled to an antenna which is configured to receive a wireless power signal, and convert the wireless power signal to a direct current input signal. A direct current-to-direct current converter generates a direct current output signal based in part on the direct current input signal and a pulse-width modulation signal.