This page is updated frequently with new Voltage Comparator-related patent applications.
|Circuits and methods providing clock frequency adjustment in response to supply voltage changes|
Methods, systems, and circuits for providing compensation for voltage variation are disclosed. A system includes: a voltage comparator configured to assert a control signal in response to detecting that one or more of power supply voltages droops below a threshold amount; a phase locked loop (pll) configured to divide an output frequency for the pll in response to the assertion of the control signal; a plurality of voltage sensors corresponding to the plurality of power supply voltages, the voltage sensors configured to output respective digital signals indicative of a voltage level of its corresponding power supply voltage; and a control circuit configured to control an oscillator frequency in the pll during the open-loop mode responsive to the respective digital signals..
|Output control circuit|
A gain control circuit includes: a gain switching controller that changes the gains of a fundamental frequency amplifier and an n-multiplied frequency amplifier; and a detection voltage comparator that determines whether the operating state of an n-multiplier is a saturated operation or a linear operation. The detection voltage comparator determines the operating state of the n-multiplier by comparing an amount of change in a detection signal (first detection signal) representing a fundamental frequency signal with respect to an amount of change in the gain of the fundamental frequency amplifier with an amount of change in a detection signal (second detection signal) representing a high-frequency signal with respect to the amount of change in the gain of the fundamental frequency amplifier.
Panasonic Intellectual Property Management Co., Ltd.
|Dimming circuit for led|
A led dimming circuit, configured to control a plurality of led strings to light up at different moment in a cycle, the circuit includes several sets of led strings connected in parallel respectively; driving circuits coupled to the led strings and driving them to light up; control circuits coupled to the driving circuits to control the led series to light up by inputting pulse width modulated signals to the driving circuits; the control circuit includes a voltage comparator and a delay circuit, the voltage comparator is coupled between the delay circuit and the driving circuit, each delay circuit and each driving circuit are connected in series thereof, the delay circuit converts the pulse width modulated signal to a delay signal, the voltage comparator converts the sine wave signal to a square wave or a rectangular wave signal.. .
Shenzhen China Star Optoelectronics Technology Co., Ltd.
|Charging system having active error correction for rechargeable batteries|
A recharging system for a battery. The internal resistance of the battery and its leads produce an error voltage when a charging current flows through the battery and the leads.
|Voltage comparator circuit and method|
This document discusses, among other things, a voltage comparator, an integrated circuit, or a voltage comparison method having increased precision. The hysteresis comparator or the integrated circuit can include first and second input transistors, each having a gate configured to receive a respective first or second input voltage.
Fairchild Semiconductor Corporation
|Semiconductor integrated circuit for regulator|
A semiconductor integrated circuit for a regulator, including: a control transistor; a control circuit; and a discharge circuit, wherein the discharge circuit includes: a constant current source circuit; a reference voltage generating circuit; a voltage comparator circuit; and a current amplification circuit, and wherein the control circuit is configured to control the control transistor in response to the control signal, and the discharge circuit is configured to operate the discharge transistor by the amplified current amplified by the current amplification circuit.. .
Mitsumi Electric Co., Ltd.
The present disclosure is applicable to electronic fields, and provides a voltage comparator. The voltage comparator includes a first branch, a second branch and a third branch.
Shenzhen Huiding Technology Co., Ltd.
|Semiconductor device and temperature sensor system|
To suppress an increase in the number of voltage comparators with an expansion in a chip temperature detection range, a temperature sensor in a semiconductor device includes a temperature detection circuit for outputting a voltage according to the chip temperature, a reference voltage generating circuit for generating a plurality of reference voltages, and a plurality of voltage comparators for comparing each reference voltage obtained by the reference voltage generating circuit with an output voltage of the temperature detection circuit and thereby generating a chip temperature detection signal configured with multiple bits. Further, the temperature sensor includes a control circuit for controlling the reference voltages generated by the reference voltage generating circuit based on the chip temperature detection signal and thereby changing correspondence between the chip temperature detection signal and the chip temperature to shift a chip temperature detection range.
Renesas Electronics Corporation
|Motor drive controller and controlling motor|
A motor drive controller includes: an advance-angle reference voltage generator that generates an advance-angle reference voltage; a back electromotive voltage comparator that generates phase signals of phases at a cross timing of the advance-angle reference voltage and back electromotive voltages of phases of a motor; and a controller that operates to perform a process including: detecting a rotation speed of the motor based on the phase signals of the phases; increasing the advance-angle reference voltage when the rotation speed moves from a high speed to a low speed; and decreasing the advance-angle reference voltage when the rotation speed moves from a low speed to a high speed.. .
Minebea Co., Ltd.
|Using pmos power switch in a combination switching and linear regulator|
A p-mos transistor may be used as either a switch in a dc-dc converter or as a pass transistor of a linear regulator. When a supply voltage is above a certain voltage, the p-mos transistor will be used in the dc-dc converter and when below the certain voltage the p-mos transistor will be used in the linear regulator.
Microchip Technology Incorporated
Three input comparator
A three input voltage comparator provides termination of a pulse width modulation (pwm) output in a switched mode power supply. Shutdown of the pwm signal occurs when a sense current from the switching transistors exceeds either or both of the limit and error current references.
Microchip Technology Incorporated
Systems and methods for powering up circuits are described herein. In one embodiment, a method for power up comprises comparing a voltage of a first supply rail with a voltage of a second supply rail, and determining whether the voltage of the first supply rail is within a predetermined amount of the voltage of the second supply rail for at least a predetermined period of time based on the comparison.
System and determining adapter current limit
An electronic device that determines an adapter current limit for a power adapter, including a regulator, a voltage comparator, and a controller. The regulator regulates an adapter output current level to prevent it from exceeding the adapter current limit, and provides a regulation signal during regulation.
Intersil Americas Llc
Adc and analog-to-digital converting method
An analog-to-digital converter includes a successive approximation converter, a voltage comparator, and a controller. The successive approximation converter receives an analog input voltage and a first reference voltage, determines the level of a voltage of a first node as a negative level of the analog input voltage, and using a successive approximation method determines an output logic value corresponding to one bit of the n-bit output digital code at every one successive approximation cycle while adjusting the level of the voltage of the first node based on a level of the first reference voltage.
Samsung Display Co., Ltd.
Circuit for monitoring metal degradation on integrated circuit
An integrated circuit (ic) having a heat-generating element, such as a power mosfet, a current-carrying conductor coupled to the heat-generating element, a sense conductor adjacent the current-carrying conductor, and a failure-detection circuit coupled to the sense conductor. When thermal cycling of the ic causes the resistance of the sense conductor to become greater than a temperature-dependent threshold value, the failure-detection circuit generates a signal indicating that the integrated circuit will soon fail.
Freescale Semiconductor, Inc.
Bandgap reference voltage circuit
A bandgap reference voltage circuit includes a bandgap reference voltage generator and a startup current generator. The bandgap reference voltage generator is configured to generate a first voltage and a second voltage.
Taiwan Semiconductor Manufacturing Company Limited
Motor drive controller and detecting rotation state
A motor drive controller is for controlling a motor having multiple phases and includes: a comparison reference voltage generator that generates a predetermined constant voltage as a comparison reference voltage; a counter-electromotive voltage comparator that compares the comparison reference voltage with a counter-electromotive voltage of each phase of the motor; and a rotation state detector that detects a rotation state of the motor based on positive/negative polarities of counter-electromotive voltages of other phases with respect to the comparison reference voltage at the time of an occurrence of a zero cross between the counter-electromotive voltage of any one phase and the comparison reference voltage.. .
Minebea Co., Ltd.
Switching regulator and the method thereof
A switching regulator uses an over voltage comparator to compare an envelop line signal with a reference wave signal, to detect whether the system is in an over voltage condition. The envelop line signal is indicative of a peak value of an inductor current..
Chengdu Monolithic Power Systems Co., Ltd.
Class d power driver peripheral
A class d peripheral is integrated with a microcontroller as a general purpose driver for providing many different class d power applications such as motor and solenoid control, audio amplification, etc. Use of a simple triangle waveform (saw tooth) oscillator normally used for detecting changes in capacitance values in combination with a voltage comparator provides inexpensive generation of pulse width modulation (pwm) suitable for a wide range of class d power applications.
Microchip Technology Incorporated
On-chip eye diagram capture
A system for capturing an eye diagram is disclosed. In various embodiments, the system includes: a delay line arranged to receive a digital signal and output a time delayed version of the digital signal; an edge detection circuit arranged to receive the digital signal and the time delayed version of the digital signal, the edge detection circuit operating to output a signal corresponding to a logical value of the digital signal received coincident with an edge of the time delay version of the digital signal; a voltage comparator arranged to receive the digital signal and a reference voltage, the voltage comparator operating to output a first signal when a voltage of the digital signal and the reference voltage are equal to each other; and a controller that includes: an edge detection circuit receiver connected to receive the output signal from the edge detection circuit; a delay line control circuit connected to provide a delay time control signal to the delay line; a voltage comparator receiver connected to receive the first signal from the voltage comparator; and a voltage control unit connected to provide a controlled voltage to the voltage comparator..
Taiwan Semiconductor Manufacturing Co., Ltd.
Measuring output current in a buck smps
A sample and hold circuit takes a sample of the current flowing through an inductor of a buck switched-mode power supply (smps) at substantially the middle of the low side portion (50 percent point during low side switch on) of the pulse width modulation (pwm) period. This sample of the current through the smps inductor during the low side on 50% point may be considered as the “average” or “dc output” current of the smps, and taken every time at precisely the same low side on 50%.
An igniter includes a switch element and a switch control apparatus. An ignition signal igt is input to an input line of the switch control apparatus.
Provided is a cr oscillator circuit that achieves a small occupied area and good oscillation frequency accuracy while having small current consumption. The cr oscillator circuit includes: a reference voltage circuit configured to switch and output a reference voltage; a first constant current source configured to charge a capacitor; a second constant current source configured to discharge the capacitor; a voltage comparator configured to compare voltages of the reference voltage circuit and the capacitor; and a logic circuit.
Seiko Instruments Inc.
Voltage comparator circuit and usage thereof
A method for testing a circuit comprising a memory element, a voltage comparator and a supply selector, the circuit is configured to be connected to two power supplies, the voltage comparator is configured to provide an output indicative of a voltage difference between the two power supplies above a predetermined threshold, the supply selector is configured to select a power supply to feed power to the memory element in response to the output from the voltage comparator. The method comprises connecting the two power supplies to the circuit, wherein said connecting comprises causing the two power supplies to drive power to the memory element and to another element of the circuit, wherein the voltage different between the two power supplies is above the predetermined threshold.
International Business Machines Corporation
Voltage comparator circuit and usage thereof
A circuit comprising a first power supply having a first voltage and a second power supplying having a second voltage, wherein said first and second voltages are different at least in some cycles of said circuit, a memory element, wherein said first and second power supplies are driven into said memory element, a voltage comparator having connected thereto said first and second power supplies, wherein said voltage comparator is an analog to digital converter configured to provide digital output indicting of a voltage difference over a predetermined threshold between said first and second power supplies, and a supply selector element, wherein said supply selector element is configured to disconnect said second power supply from said memory element in response to the digital output of said voltage comparator.. .
International Business Machines Corporation
Ultra low power programmable supervisory circuit
An ultra-low-power supervisory circuits can employ floating gate transistors. In an example, a supervisory circuit can include a reset output circuit, a voltage comparator circuit configured to reset the reset output circuit when a first input voltage falls below a reference voltage, and a watchdog circuit configured to receive a watchdog signal and to reset the reset output circuit if the watchdog signal does not transition within a predetermined watchdog interval.
Analog Devices Global
Fast response pulse width modulation control for switching regulator
A switching rectifier circuit includes a pulse width modulation controller, a voltage switching circuit, a pulse width modulation comparator, an error amplifier, a voltage reference, a high threshold voltage comparator and a low threshold voltage comparator. A varying output voltage of the voltage regulator is sampled and compared to a high threshold voltage reference and a low threshold voltage reference.
Sandisk Technologies Inc.
Method and controlling power at base station in a communication system
A method and apparatus for controlling power of a base station (bs) in a wireless communication system are provided, in which a voltage comparator compares an operation voltage of a power control target of the bs with a minimum required voltage for the power control target, and a controller decreases the operation voltage of the power control target by a predefined level, if the operation voltage is higher than the minimum required voltage, and increases the operation voltage of the power control target by a predefined level, if the operation voltage is lower than the minimum required voltage.. .
Samsung Electronics Co., Ltd.
A voltage comparator for comparing reference voltage applied to a first input node to an input voltage applied to a second input node. A first pair of transistors have output terminals coupled in series between the first input node and common node, and gate terminals connected together.
Verification of bandgap reference startup
A bandgap reference (bgr) startup verification circuit includes a current minor for receiving an output current from a bandgap reference (bgr) circuit and generating output currents therefrom. A first verification sub-circuit is coupled to receive a first output current to generate a detection voltage (vdet) and includes a voltage comparator receiving vdet and a voltage output of the bgr circuit (vbg) to provide a first verification output.
Texas Instruments Deutschland Gmbh
An overcurrent detector that includes a sense transistor connected to a sense resistor, a second transistor matched to the sense transistor and connected in parallel to a second resistor, and a voltage comparator coupled to the sense transistor and second resistor. The sense transistor is configured to connect in a same gate and source connection with a driver output transistor.
Texas Instruments Incorporated
Method and system to prevent bus voltage sagging when an oring-fet in an n+1 redundant power supply configuration is faulty during power up
A system and method for preventing bus voltage sagging when an oring-fet in an n+1 redundant power supply configuration is faulty during power up. Each redundant power supply includes an oring-fet and a voltage comparator.
Cisco Technology, Inc.
Universal serial bus active cable power management
The present disclosure provides a system and method for controlling power in an active cable via a circuit mechanism located internally within the cable assembly. The system may include a first device communicatively coupled to a second device via the cable assembly and a device power line.
System and protection of a wind turbine battery backup pitch control system
A pitch control system for a wind turbine includes a backup battery bank assigned to each pitch drive motor, with each battery bank having a plurality of individual batteries connected in series. A battery charger is connected in parallel across each battery in the battery bank.
General Electric Company
Apparatus and selectively determining a mode of operation
An apparatus for selectively switching a mode of operation of a detector, the apparatus comprising a detector configured for connection to a signalling terminal, switching means for configuring the detector to operate in one of sink mode or source mode and a voltage comparator, wherein the apparatus is configured to selectively switch to operate in sink mode or source mode based on a comparison of a voltage from the signalling terminal received at the voltage comparator with a threshold voltage.. .
Crowcon Detection Instruments Limited
Circuit for current sensing in high-voltage transistor
An integrated circuit including a high-voltage n-channel mos power transistor, a high-voltage n-channel mos blocking transistor, a high-voltage n-channel mos reference transistor, and a voltage comparator, configured to provide an overcurrent signal if drain current through the power transistor in the on state exceeds a predetermined value. The power transistor source node is grounded.
Texas Instruments Incorporated
Class hd power amplifier
A multi-level amplifier including a converter circuit being supplied with a supply voltage and operable to generate at least two output voltages, a voltage comparator circuit adapted to compare each of the output voltages with the supply voltage to generate a driving signal, and an amplifier circuit being supplied with an analog input signal, the amplifier circuit including an analog-to-digital converter coupled to a power stage driver and power stage, wherein the power stage driver receives the driving signal from the voltage comparator.. .
Analog Devices Technology
Apparatus and a boost converter with improved electrical overstress (eos) tolerance
An apparatus and method for a boost power converter with improved electrical overstress (eos) tolerance is disclosed. A boost power converter provides a providing a pulse width modulation (pwm) boost power converter with an electrical overstress (eos) boost over-voltage comparator/switch network comprises a boost power converter, a boost overvoltage comparator, a boost overvoltage comparator feedback network, and a boost overvoltage switch.
Dialog Semiconductor Gmbh
Laser heterodyne interferometric signal processing method based on locking edge with high frequency digital signal
The present invention discloses a processing method for laser heterodyne interferometric signal based on locking edge with high frequency digital signal. A reference signal and a measurement signal of heterodyne interferometer, after being processed by photodetector, signal amplifier, filtering circuit, voltage comparator and high frequency digital edge locking module, are transferred to pulse counting synchronized latching processing module, to obtain entire cycle interference fringe numbers and filling pulse numbers in one interference fringe cycle, of the reference signal and the measurement signal; the numbers are transferred to a computer to obtain displacement and speed of a measured object; usage of a high frequency digital pulse signal to lock the rising edge of laser heterodyne interferometric signal can improve the gradient of the rising edge of interference signal and eliminate wrong pulse caused by noises, and improve the accuracy and stability of the processing for the following signals..
Zhejiang Sci-tech University
Switching power-supply device
A switching power-supply device includes a comp-voltage comparator circuit that compares a comp-voltage obtained by performing phase compensation on the feedback signal, with a first threshold voltage which is a threshold value; and an intermittent-oscillation control circuit that, if it is detected by the comp-voltage comparator circuit that the comp-voltage is lower than the first threshold voltage, stops the switching operation of the switching device and performs a transition to a first intermittent oscillation operation in which the switching device performs the switching operation every predetermined first period, wherein if a predetermined delay period elapses in a state where the comp-voltage is lower than the first threshold voltage, the intermittent-oscillation control circuit performs a transition to a second intermittent oscillation operation in which the switching device performs the switching operation every second period which is an integral multiple of the first period.. .
Method and determining time-varying limitations of a power source
A low-power method and apparatus is provided for adapting to time-varying limitations of a power source, such as a vehicle power source which is in a more-limited state when the engine is off. The supply voltage is monitored for changes using an unclocked, low-power first stage having an analog section, a voltage comparator.