|| List of recent Duty Cycle-related patents
|Distributed control system for parallel-connected dc boost converters|
The disclosed invention is a distributed control system for operating a dc bus fed by disparate dc power sources that service a known or unknown load. The voltage sources vary in v-i characteristics and have time-varying, maximum supply capacities.
|Method and apparatus for incoming call detection in a dual sim single rf communication device|
A method and apparatus to co-ordinate detection of incoming calls in a multimode dual-sim single rf chain wireless communications device. Incoming voice over lte calls cannot be detected by monitoring lte paging messages.
|Short-circuit protection structure|
A short-circuit protection structure comprises first and second high-voltage transistors, a control circuit, a first current sampling resistor for the first transistor and a second current sampling resistor for the second transistor. The control circuit controls switching period and duty cycle of the first transistor and the second transistor, a drain terminal of the first transistor is connected to a drain terminal of the second transistor, a source terminal of the first transistor is connected to the first current sampling resistor, and a source terminal of the second transistor is connected to the second current sampling resistor; a gate terminal of the first transistor and a gate terminal of the second transistor are connected to a driver stage of the control circuit.
|System 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.
|Pulse 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.
|Signal duty cycle reduction|
A method may include receiving a positive in-phase (“i”)-channel signal (“i+ signal”), a negative i-channel signal (“i− signal”), a positive quadrature-phase (“q”)-channel signal (“q+ signal”), and a negative q-channel signal (“q− signal”). The method may further include outputting a truncated i+ signal, a truncated i− signal, a truncated q+ signal, and a truncated q− signal.
|Gradient amplifier with compensation for dead time and forward voltage|
The present invention relates to a method for compensating non-linearities of a gradient amplifier (1) for powering a gradient coil (16), wherein the non-linearities are caused by the finite dead time of the amplifier and/or by a forward voltage drop, the gradient amplifier (1) comprising a controllable full bridge (8) and an output filter (9), whereby the full bridge (8) is controlled to provide a desired coil current (ic), comprising the steps of receiving a desired duty cycle (aeff) of the gradient amplifier (1), measuring an input current (ifilt) and an output voltage (ucfilt) of the output filter (9), evaluating an modulator duty cycle (amod) as a function of the desired duty cycle (aeff) and the measured input current (ifilt) and the measured output voltage (ucfilt), and providing the modulator duty cycle (amod) for controlling the full bridge (8). The present invention further relates to a gradient amplifier (1) for powering a gradient coil (16) comprising a controllable full bridge (8) comprising at least two half bridges (10), each half bridge (10) having at least two power switches (11) connected in series, whereby each half bridge (10) is tapped at its center point between two the power switches (11), and an output filter (9) connected to the tapped center points of the half bridges (10), a controller unit (4) for providing a desired duty cycle (aeff) of the gradient amplifier (1), a compensation block (5) for providing an modulator duty cycle (amod) as a compensation of the desired duty cycle (aeff) according to any of the above method claims, and a modulator (6) for controlling the power switches (11) according to the modulator duty cycle (amod) provided by the compensation unit (5)..
|Rotation speed control method for impact type fastening tools|
A rotation speed control method for impact type fastening tools has a presetting step and a dynamic control step. The presetting step includes setting a plurality of working positions, and setting a pwm signal with a larger duty cycle as a driving signal in a period after energization so that a motor can rotate at a higher speed and improve work efficiency.
|Transducer access point|
The invention relates to a method and apparatus for exposing (i.e. Bridging) data and services offered by low power, low duty cycle transducers (e.g.
|Pneumatic pressure output control by drive valve duty cycle calibration|
In various embodiments, a surgical console may include a pneumatic valve to drive a pneumatic tool coupled to the surgical console. The console may further include a controller operable to control and adjust the valve open/close cycle times according to a valve duty cycle.
|Methods and apparatuses for energetic neutral flux generation for processing a substrate|
Apparatuses and methods for processing substrates are disclosed. A processing apparatus includes a chamber for generating a plasma therein, an electrode associated with the chamber, and a signal generator coupled to the electrode.
|Variable pulse width signal generator|
The present invention concerns a signal generator circuit powered by a supply voltage and including flip flop means including a first input to which is connected a continuous input signal whose amplitude is defined, a second input to which is connected a clock signal whose duty cycle is defined, and a third, reset input, and outputting an output signal whose duty cycle is that of the clock signal and whose amplitude is that of the input signal, characterized in that said circuit further includes regulating means arranged to compare the output signal to a set point signal representative of the desired duty cycle and to deliver a control signal connected to the third input of the flip flop means so as to activate the reset to modify the duty cycle of the output signal.. .
|Anti-shoot-through automatic multiple feedback gate drive control circuit|
Automatic and robust anti-shoot-through glitch-free operation of half-bridge control pre-driver and power stage circuits have been achieved by using multiple feedback control signals. These feedback signals are taken both from the gates of power devices on high side and low sides and from the gates of one or more devices on both high side and low side that enable power device on state.
|Predictive 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.. .
|Genetic regulation of bone and cells by electromagnetic stimulation fields and uses thereof|
The present invention provides methods to modify the genetic regulation of mammalian tissue, bone, cells or any combination thereof by preferential activation, up-regulation and/or down-regulation. The method comprises steps of tuning the predetermined profiles of one or more time-varying stimulation fields by manipulating the b-field magnitude, rising slew rate, rise time, falling slew rate, fall time, frequency, wavelength, and duty cycle, and exposing mammalian cells or tissues to one or more tuned time-varying stimulation fields with predetermined profiles.
|Active valley fill power factor correction|
A power converter is disclosed that includes an active valley fill (avf) capacitor that is actively switched to provide current to a load during a portion of an alternating current (ac) input cycle. The current supplied to the load includes some current supplied by the ac input and some current supplied by the avf capacitor.
A laser marker/pointer for projecting circular or elliptical laser beam patterns onto a target surface such as a portion of a presentation screen or to assist in the aiming of a firearm, comprises a handheld shell body in which is mounted a laser light source, a rotating optical mirror driven by a motor, and an electronic drive circuit, whereby the aspect ratio of the marking pattern is determined by the geometric relationship of the motor shaft axis, the laser beam, and the mirror surface. The motor drive circuit when initially powered (along with the laser diode), applies full power (a continuous dc voltage to the motor to overcome inertia), followed by a pulsed voltage to lower the duty cycle of the motor, increase battery life, and reduce rotational noise..
|Optical detecting device and related method of synchronization adjustment|
A method of synchronization adjustment is applied to an optical detecting device, so as to synchronize an exposure timing sequence of an image detector with a light emitting timing sequence of an indicating light source. The method includes acquiring a continued image set, analyzing intensity of each image of the continued image set, and adjusting the exposure timing sequence according to duty cycle of the image detector and intensity ratio of at least two images.
|Dynamic level shifter circuit|
A level shifter does not require any dc (standby) current consumption and has a fast operation with low propagation delay. The level shifting from input to output voltage ranges is performed by a pair of level shifting capacitors.
|Backlight driving circuit, lcd device, and method for driving the backlight driving circuit|
A backlight driving circuit includes a constant current driving chip, a power module, and a light emitting diode (led) lightbar coupled with the power module. The constant current driving chip includes a control module that controls switching frequency of the power module, and an adjusting module that adjusts duty cycle of effective current flowing through the led lightbar.
|Method and apparatus for detecting a target keyword|
A method of detecting a target keyword for activating a function in an electronic device is disclosed. The method includes receiving an input sound starting from one of the plurality of portions of the target keyword.
|Responsive load control method|
The responsive load control method manages the allocation and adjustment of service triggering grid frequencies across a population of responsive loads. The responsive load control method is particularly suited to responsive loads that have substantially no duty cycle or which have a long duration (>1 hr) duty cycle.
|Current source rectifier modulation in discontinuous modes of operation|
Systems and methods disclosed herein include a controller for a current source rectifier that is configured to facilitate operation in both continuous and discontinuous conduction modes. The controller comprises a discontinuous mode detection unit configured to determine when input current of the current source rectifier becomes discontinuous and a duty cycle calculation unit adapted to calculate duty cycles for the current source rectifier differently for operation in continuous or discontinuous mode.
|Method for balancing capacitors in an inverter|
The pwm modulating method comprises the following steps: detecting actual voltage values (vc1, vc1, vc2, vc3 . .
|Vehicular safety assistive device|
A vehicular assistive safety device that couples between a vehicular brake light and the vehicle's brake pedal switch, having a logic responsive to each activation of the brake pedal switch to initiate a duty cycle of a plurality of periods of various output intensity and duration of said brake light. Sequential period durations and intensities are unequal, respectively, to their predecessors.
|Event-driven clock duty cycle control|
Duty cycle error vectors that indicate both the magnitude and direction of the duty cycle error relative to a desired duty cycle are generated within a duty cycle measurement circuit, enabling threshold-based determination of whether duty cycle adjustment is necessary, refraining from power-consuming adjustment and follow-up measurement in those cases where the duty cycle is within a target range. When duty cycle adjustment is deemed necessary, the magnitude of the duty cycle error indicated by the duty cycle error vector may be applied to effect proportional rather than incremental duty cycle adjustment, quickly returning the clock duty cycle to a target range..
|Duty cycling to reduce average transmit power|
A user device receives a command to transmit information at a transmit power level specified by a wireless carrier. The user device determines whether transmitting the information at the specified transmit power level using a first duty cycle will cause the user device to violate a condition.
|Bridgeless boost power factor correction circuit for constant current input|
The present disclosure provides techniques for power factor correction on a constant current system without the use of a diode rectifier bridge. In an example embodiment, the present disclosure provides a power factor correction circuit which includes two switching mosfets biased in opposite directions which operate during opposite half cycles of the input current.
|Active power factor correction circuit for a constant current power converter|
The present disclosure provides techniques for power factor correction on a constant current system. In an example embodiment, the present disclosure provides a power factor correction circuit which receives a constant current power input.
|Voltage adjustment method, and voltage pre-regulator power supply circuit and system|
A voltage adjustment method, and a voltage pre-regulator power supply circuit and system, that implements highly-efficient output of a power supply in a quasi straight-through state and increases voltage output precision of a circuit. The voltage adjustment method includes receiving a to-be-adjusted voltage through a positive wire input end and a negative wire input end; changing, in a control mode in which a connection time is fixed and a disconnection time is adjusted, a duty cycle for the to-be-adjusted voltage to obtain a primary adjusted voltage; and changing, in a control mode in which a disconnection time is fixed and a connection time is adjusted, a duty cycle for the primary adjusted voltage to obtain an output voltage.
|Three-level led bulb microprocessor-based driver|
An led bulb is described, comprising leds within a shell and a driver circuit to operate the leds at a plurality of brightness levels. The driver circuit comprises first and second inputs to receive ac, a neutral input, a converter circuit, first and second rectifier circuits, a detector circuit, and a processing circuit.
|High duty cycle ion spectrometer|
An ion spectrometer is provided, comprising: an ion source, arranged to generate ions continuously with a first range of mass to charge ratios; and an ion trap, arranged to receive ions from the ion source along an axis, and to eject ions with a second range of mass to charge ratios orthogonally to that axis, the second range of mass to charge ratios being narrower than the first range of mass to charge ratios. In some embodiments, ions generated by the ion source continuously flow into the ion trap.
|System, apparatus, and method for thrust vectoring|
In various embodiments, the thrust vectoring systems described herein create variable reverse thrust during a landing event. The reverse thrust may be varied based on manual inputs, dynamically changing operating events, or a landing duty cycle.
|Transmitter with class e amplifier|
According to one embodiment, a transmitter includes a first buffer, a second buffer, a logic circuit, and a class e power amplifier. The first buffer receives a first sinusoidal signal, and converts the first sinusoidal signal to a first rectangular wave signal.
|System, method, and apparatus for heating|
The present invention relates to a heating element controller 100 for a liquid heating system arranged to determine the duty cycle of a heating element 106 and modulate the timepoint of heating initiation by the heating element 106 in dependence upon an expected duration of completing the heating process and upon a required time at which the heating process is to be completed, wherein said expected duration is determined in dependence on said duty cycle. The invention extends to a heating element controller comprising means for computing a fouling parameter and means for controlling the operation of the heating element in dependence upon the fouling parameter.
|Inverter circuit, power converter circuit, and electric vehicle|
An object is to reduce, with the control circuit of the full-bridge inverter circuit, distortions in an output signal of the inverter circuit resulting from an error in control of the switching of the high-side transistors and low-side transistors included in the first half-bridge circuit and the second half-bridge circuit. The pulse width of a signal that controls on/off of the high-side transistors and low-side transistors included in the first half-bridge circuit and the second half-bridge circuit is reduced, i.e., the duty cycle of the signal is reduced.
|Duty cycle based liquid level detection system for a driveline component|
The present disclosure relates to a detection system for detecting a liquid level in a rotating driveline component. The detection system may include a sensor for detecting the liquid and a receiver for determining the liquid level based at least in part on information detected by the sensor..
|Method for diagnosing a variable reluctance magnetic detection head, and detection circuit|
A variable-reluctance magnetic detection head delivers an electrical signal (uin) and a rising wavefront of the electrical signal is compared with a first threshold (th) in order to switch from a first state (b0) to a second state (b1), and a falling wavefront is compared with a second threshold (tb) lower than the first threshold (th) in order to switch from the second state (b1) to the first state (b0). In a diagnostics step, the first threshold (th) or the second threshold (tb) is modified, bringing these thresholds closer together, and a magnetic detection head is diagnosed as being defective if the duty cycle of the second state (b1) is modified during the diagnostics step by a value higher than a diagnostics threshold predetermined in relation to a reference level..
|Power converter for interfacing a fluorescent lighting ballast to a light emitting diode lamp|
An ac/dc power converter is coupled between a fluorescent ballast circuit and a set of light emitting diodes (leds) forming an led lamp. The power converter converts an ac output from the ballast circuit to a dc current applied to drive operation of the leds.
|Quick heating quartz toaster|
A commercial toaster apparatus having a “quick start” feature that nearly instantly changes from a “stand-by” mode to a “toasting” mode. The “quick start” mode is provided by changing the circuitry of some of the quartz heating elements from a series configuration to a parallel one wherein a higher voltage can be applied for a controlled amount of time to regulate the quartz heaters without adversely affecting the life span of the heating elements.
|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..