471 results about "Error amplifier" patented technology

The invention provides a voltage stability control method for a multi-output switching power supply, which comprises the following steps of: sampling a main output channel in real time to obtain a voltage signal; the voltage signal is processed through a wide bandwidth error amplifier, a main channel adjusting signal is generated, and the main channel adjusting signal is used for driving a main power switch device; receiving an input voltage fluctuation frequency band of an auxiliary channel, a load current transient change gradient and a frequency spectrum coupling characteristic of a main channel adjusting signal through a dynamic prediction model, and generating an auxiliary channel adjusting signal with a phase lead compensation characteristic; a cross coupling active offset mechanism is constructed, time domain-frequency domain characteristics of coupling interference are extracted through a high-precision differential detection circuit, amplitude-frequency adjustable reverse correction signals are generated in real time through an adaptive compensation algorithm and injected into control nodes of an auxiliary output channel, and dynamic decoupling and ripple suppression are carried out. According to the method, high-stability control of multi-channel voltage under all working conditions is realized, and the dynamic response speed and the anti-interference capability are improved.

A DC / DC converter includes a converter stage to receive an input voltage and to provide an output voltage from the input voltage in accordance with a modulated drive signal. The converter stage further provides a feedback voltage representing the output voltage. A controller circuit includes an error amplifier to receive the feedback voltage and a reference voltage and to provide an error signal based on the feedback voltage and the reference voltage. A PWM modulator receives a clock signal and the error signal and generates a modulated signal based on the clock signal and the error signal, and a logic circuit receives the modulated signal and generates the drive signal for the converter stage based on the modulated signal so that the drive signal has the same duty cycle as the modulated signal, when the duty cycle of the modulated signal is not smaller than a minimum duty cycle value.

The invention discloses an LDO (Low Dropout Regulator) circuit based on a level conversion and pre-adjustment module. The LDO circuit comprises a reference source, an error amplifier, a pre-adjustment module, a level conversion module, a power switch tube P1, a power circuit tube N1 and resistance feedback networks R1 and R2. The pre-adjustment module carries out voltage reduction processing on an input high-voltage power supply, and the level conversion module generates bias voltage according to an enable signal and the high-voltage power supply, controls a power switch and a switch in the operational amplifier, and ensures that the circuit is resistant to high voltage and extremely low in drain. The error amplifier adjusts the grid voltage of the power circuit according to the feedback and reference voltage difference value, and controls the current to stably output the voltage. And the resistance feedback network realizes closed-loop regulation of the output voltage. Under the condition that the LDO is enabled to be closed, the power tube can be ensured to be completely closed no matter the LDO is under the working voltage of 3V or 5V, so that the electric leakage condition of the LDO is greatly improved, and the LDO has the characteristic of low electric leakage.

The utility model discloses a constant-current and constant-voltage circuit without software control, which comprises a Buck power level circuit, a voltage sampling circuit, a current sampling circuit and an error amplifying circuit, and the error amplifying circuit is provided with a first error amplifier and a second error amplifier. The output end of the first error amplifier and the output end of the second error amplifier are electrically connected with the Buck power level circuit, the Buck power level circuit is electrically connected with the voltage sampling circuit and the current sampling circuit, the voltage sampling circuit is electrically connected with the first error amplifier, and the current sampling circuit is electrically connected with the second error amplifier. An FREQ pin of a Buck chip U4 is grounded, a 0.76 V voltage is obtained through voltage division by a resistor R27 and a resistor R29, so that the switching frequency of a Buck power level circuit is invalid, the voltage is controlled through a first error amplifier, the current is controlled through a second error amplifier, the first error amplifier and the second error amplifier carry out operation, and then a PWM comparator in the Buck chip U4 is controlled through a COMP pin of the Buck chip U4. Therefore, voltage and current are controlled.

The invention provides a feedback compensation circuit for a switching power supply. The feedback compensation circuit comprises a reference voltage source, an error amplifier, a feedback capacitor, a sampling circuit, an optocoupler output circuit and a PWM control chip, output voltage is connected to the inverted input end of the error amplifier through the sampling circuit, the reference voltage source is connected to the in-phase input end of the error amplifier, and the output end of the error amplifier is connected to a feedback pin of the PWM control chip through the optocoupler output circuit. The sampling circuit comprises an upper sampling resistor, a lower sampling resistor, a second resistor and a second capacitor; the feedback capacitor is connected between the inverting input end and the output end of the error amplifier; by selecting feedback capacitors with different capacities, the low-frequency gain of a transfer function from output to control of the feedback compensation circuit is adjusted. According to the invention, the element parameter design process is greatly simplified, the controllability of low-frequency gain is enhanced, and the technical effects of easy parameter design and simple debugging are achieved.

The invention provides an error amplifier for peak current mode control and a converter system. The error amplifier comprises a transconductance amplifier, a voltage clamping module, a voltage-current converter, a slope compensation module, a current clamping module and a mirror image tube, the negative end of the transconductance amplifier is used for loading feedback voltage, and the positive end is used for loading reference voltage; the output end of the transconductance amplifier, the output end of the voltage clamping module and the input end of the voltage-current converter are electrically connected; the voltage-current converter generates error current; the slope compensation module is used for performing slope compensation on the error current to generate a compensated current; the output end of the slope compensation module, the output end of the current clamping module and the positive end of the high-side comparator are electrically connected with a second reference node; and the mirror image tube is used for loading the comparison voltage to the positive end of the high-side comparator. The error amplifier provided by the invention can realize more stable mode switching and more accurate current limiting control.

To provide a controller in which total harmonic distortion (THD) can be improved.SOLUTION: A controller (700) includes: a first external terminal receiving a first voltage (Vmult) with a full-wave rectified waveform; a second external terminal receiving a first detection voltage (Vis), as a negative voltage, generated by a current flowing through a sense resistor (Ris) connected to a ground potential application terminal; an error amplifier circuit (710) generating a second voltage (V2) by amplifying an error between a second detection voltage (Vs) corresponding to an output voltage (Vdc) and a reference voltage (Vref1); an arithmetic circuit (733) generating a third voltage (V4) by multiplying the first and second voltages; an inverting amplifier (734) generating a fourth voltage (V5) by inverting and amplifying the first detection voltage; and a comparator (735) comparing the third voltage and the fourth voltage.SELECTED DRAWING: Figure 11

The invention discloses a clamping circuit of an error amplifier, which belongs to the field of analog integrated circuits and comprises an error amplifier EA, a low-voltage clamping circuit and a high-voltage clamping circuit. The error amplifier EA comprises a first-stage operational amplifier, the non-inverting input end of the first-stage operational amplifier is connected with feedback voltage VFB, the inverting input end of the first-stage operational amplifier is connected with reference voltage VREF, and the first-stage operational amplifier outputs VC voltage; the error amplifier EA is used for amplifying the change of the feedback voltage VFB; when the VFB is reduced or increased, the corresponding low-voltage clamping circuit or the high-voltage clamping circuit works, the output VC of the first-stage operational amplifier is clamped to the low-voltage clamping limit VclampL or the high-voltage clamping limit VclampH, the VC is controlled to be within a certain range, then clamping of the output current IEA of the error amplifier EA is achieved, quick response and stable adjustment of a loop are achieved, and meanwhile the function of protecting the circuit is achieved.

A power supply control device, which is a main controller of a switching power supply, includes an error amplifier, a ramp signal generation circuit, a comparison signal generation circuit, a logic circuit, a switch drive circuit, a reverse current detection circuit, and a ramp signal holding circuit. The logic circuit adjusts an input offset of the comparison signal generation circuit, the error signal, or the ramp signal in a direction that reduces a difference between the error signal and the ramp signal in response to a predetermined trigger signal.

The invention discloses a seamless range switching system and a seamless range switching method for instrument current measurement. The seamless range switching system comprises a digital-to-analog converter, an error amplifier, a first driving circuit, a first current measurement circuit, a clamping circuit, a second driving circuit, a second current measurement circuit, two analog-to-digital converters and a field programmable gate array. The first current measuring circuit converts 10 [mu] A to 30 mA low current into a first voltage signal to form a negative feedback closed loop. When the first voltage signal reaches a Zener breakdown threshold value, the clamping circuit outputs a trigger signal to start the second driving circuit, so that the two driving circuits jointly provide a total current of 30mA to 500mA for the load; the two analog-to-digital converters perform synchronous sampling, and the field programmable gate array selects digital signal output which is in a linear measurement range and has an error not exceeding + / -0.05% of a full scale. No mechanical switch exists in the switching process, the current is uninterrupted, and wide-range high-precision continuous measurement is achieved.

Provided is a power source control device for a DC / DC converter including a high-side transistor, a low-side transistor, and an inductor, the power source control device including a first error amplifier configured to receive a first reference voltage and a feedback voltage based on an output voltage of the DC / DC converter, a second error amplifier configured to receive an output of the first error amplifier and a signal indicating information regarding a current flowing through the inductor, a first comparator configured to receive an output of the second error amplifier and a ramp voltage, a switching control unit configured to perform switching control of the high-side transistor and the low-side transistor according to an output of the first comparator, and a clamp circuit configured to clamp a second amplifier output voltage outputted from the second error amplifier, to a predetermined clamp voltage.

This invention discloses a power supply device, a thermal regulation method, and a power supply system. The power supply device includes a power switch for converting a first power signal into a second power signal according to a control signal; a first current source for providing a current signal to a first node; a control circuit for converting the current signal into the control signal; a temperature-controlled current extraction circuit including at least one temperature sensing element disposed at at least one position on the power switch for generating at least one voltage signal, the at least one voltage signal being respectively related to the temperature of the at least one position; an error amplifier for generating an adjustment signal based on the at least one voltage signal and a reference voltage; and an adjustment switch for extracting an adjustment current from the current signal at the first node according to the adjustment signal.

The invention relates to the technical field of integrated circuit design, high-voltage power supply management chips and the like, and provides a voltage stabilizing circuit suitable for a high-voltage power supply management chip and the high-voltage power supply management chip. The circuit comprises an error amplifier, an N-channel MOS tube M1 and a voltage setting feedback network. The error amplifier outputs a control signal to the grid electrode of the M1 by comparing a reference voltage with a feedback voltage; the drain electrode of the M1 is connected with input high voltage VIN, and the source electrode is grounded through a feedback network to form a negative feedback structure. The voltage stabilizing circuit provided by the invention is simple in structure, high in stability and fast in response, can solve the problems of complex loop gain and difficult compensation, realizes the simplification of a loop structure, improves the phase margin of a circuit system, enhances the stability and load transient response, can be integrated in a high-voltage power supply management chip, and has a wide application prospect. And a stable low-voltage power supply is provided for high-voltage applications such as industry and automotive electronics.

The application discloses a kind of LDO without slice outside capacitance, belongs to linear power supply technical field, including transconductance constant circuit Gmc, constant transconductance error amplifier AE1, first output circuit, error amplifier AE2, second output circuit, band gap reference circuit BGR, power tube Pn1 and power tube Pn2;The transconductance constant circuit Gmc is used to generate bias voltage signal;The constant transconductance error amplifier AE1 is used to generate first output signal;The error amplifier AE2 is used to generate second output signal;Band gap reference circuit BGR generates multiple independent stable outputs, provides stable reference voltage for constant transconductance error amplifier AE1 and error amplifier AE2, and then generates bias voltage through transconductance constant circuit Gmc, and constant transconductance error amplifier AE1 drives power tube Pn1 through first output circuit to output signal for analog load, and error amplifier AE2 drives power tube PN2 through second output circuit to output signal for digital load.

The application discloses a kind of self-adaptive power energy storage converter control method and system, this method can effectively solve the problem of overvoltage and under-voltage of grid-connected point and overcharge and overdischarge of energy storage battery by controlling the adaptive charge and discharge of energy storage battery.First, the grid voltage is sampled and the effective value is processed to obtain the grid voltage effective value feedback signal U gf_rms , and it is sent to the inverting input end of voltage error amplifier, and the grid voltage reference U ref Is sent to the non-inverting input end of voltage error amplifier.The output U e Of voltage error amplifier is obtained by positive and negative limiting link U e1 Is sent to one input end of multiplier.The state signal J of range determination is obtained by the state of charge signal Soc of energy storage battery, and the other input end of multiplier is sent.The output I ref Of multiplier is sent to the non-inverting input end and inverting input end of current regulator respectively with the charging current sampling signal I bf Of energy storage battery.The output of current regulator is used as modulation signal, and it is sent to PWM modulator.

A reference buffer with wide output voltage and current range is provided. A reference buffer includes an error amplifier comprising a first input, a second input, and a first output, wherein the amplifier is configured to generate an output signal indicative of an error between an output reference signal and an internal reference signal. The reference buffer further includes a first voltage follower circuit configured to generate the output reference signal based, at least in part, on the output signal of the error amplifier, wherein the first voltage follower comprises a third input and a second output, and wherein the second output is coupled to the second input of the error amplifier.

The invention relates to a BOOT converter soft start circuit for a large-area-array image sensor, and belongs to the technical field of power management. The technical problem of output voltage overshoot caused by overlarge difference between reference voltage and feedback voltage when the BOOST converter is started is mainly solved. According to the technical scheme, a soft start module generates a linearly-increased soft start voltage VSS, and when the VSS is smaller than a reference voltage VREF, the VREF is replaced to be input into an error amplifier, so that a feedback voltage VFB linearly rises along with the VSS, and the surge of an inductive current is restrained. Technical effects include thoroughly eliminating voltage overshoot, maintaining optimal performance parameters of the system, providing programmable startup characteristics, enhancing system reliability, and simplifying integration complexity.

The application discloses a kind of static current control systems of double data rate linear voltage regulator, including reference generating circuit and by feedback control circuit, error amplifier circuit and power output circuit constitute idle power consumption control circuit, reference voltage VREF generated by reference generating circuit is exported to feedback control circuit, after feedback control circuit compares the control signal output by error amplifier circuit, exports to error amplifier circuit to make the control signal output by error amplifier circuit also change, the control signal in turn controls upper and lower power tube in power output circuit, by adjusting VREF generated by reference generating circuit, to flexibly adjust system idle power consumption, while considering low power consumption and the fast transient response of load switching.

The present disclosure relates to a switching converter and its control circuit. The control circuit includes an error amplifier, a transient-response compensation circuit and a PWM comparator. The transient-response compensation circuit is coupled to an output terminal of the error amplifier for increasing a differential current of the error amplifier to increase the rate of output change of the error amplifier in a case that a voltage difference between the first feedback signal and the reference voltage exceeds a predetermined threshold. The output voltage can be prevented from having too high or too low fluctuations when a load changes, thereby improving transient response characteristics of the power converter, and optimizing dynamic characteristics of the power converter over a wide range of the fluctuation of the load in a continuous operation mode.

An isolated DC-DC converter has a transformer with primary, secondary and auxiliary windings, and a secondary-sensing regulation architecture. A primary-side controller has a PWM generator, a wake-up pulse detector, a supply voltage generator and control circuitry. A secondary-side controller has an error amplifier, a switching detector, a wake-up pulse generator, a supply voltage generator and control circuitry. The primary-side controller and the secondary-side controller produce respective supply voltages in such a way that, when the DC-DC converter enters an idle state, the controllers enter respective sleep states wherein the PWM generator and the error amplifier are not supplied, while retaining the ability of producing and detecting a wake-up pulse when necessary.

The application discloses a high-duty-cycle control system of a step-down DC-DC switching power supply, which is additionally provided with a high-duty-cycle control system on the basis of a basic structure of the switching power supply and comprises an LDO, a diode D2 for charging a capacitor C1 by the LDO, an error amplifier, a current comparator, an OR gate, a pulse generator, an RS latch and an under-voltage lockout circuit for detecting a voltage VBS between the capacitor C1. The under-voltage lockout circuit detects the voltage VBS between the capacitor C1, when the voltage is insufficient, temporarily turns off a charging switch tube M1, charges the capacitor C1 for providing a stable voltage power supply for a driving circuit during the turn-off of the M1, restores the power supply voltage of the driving circuit, and then reopens the M1, so as to realize the high-duty-cycle conduction of the NMOS type charging switch tube.

A control circuit for a power converter includes a first sensing circuit, a reference voltage generating circuit, an error amplifier circuit and a pulse width modulation circuit. The first sensing circuit is coupled to a first output circuit to provide a first current sensing signal. The reference voltage generating circuit is coupled to the first sensing circuit and provides a reference voltage according to the first current sensing signal. The error amplifier circuit is coupled to the reference voltage generating circuit to receive the reference voltage and an output feedback voltage of the power converter to provide an error amplifier signal. The pulse width modulation circuit is coupled between the error amplifier circuit and the first output circuit to receive the error amplifier signal and provide a control signal to control the first output circuit. The reference voltage generating circuit also receives the error amplifier signal and adjusts the reference voltage generated according to the error amplifier signal. The control circuit for the power converter can effectively improve the output stability without affecting the output voltage under long time load.

A linear regulator includes: a first output stage circuit for generating a first output voltage according to a first control voltage; and a calibration circuit, enabled during a first calibration period after startup of the linear regulator. During the first calibration period, the calibration circuit is configured to operably generate the first control voltage based on an output-related signal and a reference voltage, and the output-related signal is related to the first output voltage. The first output stage circuit and the calibration circuit form a first control loop which enters an open-loop state after the end of the first calibration period. The first output stage circuit includes a second control loop, configured to operably regulate the first output voltage in a closed-loop manner based on the first control voltage and a variation of the first output voltage during an operational period following the first calibration period.

The application provides a transient response enhanced multi-loop low-dropout linear voltage regulator, comprising: a bias module for providing a bias voltage; a band gap reference module for providing a reference voltage; a power tube for providing an output voltage; a voltage follower for generating a control voltage and a driving current based on the bias voltage and the reference voltage; a source-coupled error amplifier for generating a gain voltage according to the output voltage and the control voltage; a common gate for generating a first voltage according to the reference voltage and the gain voltage; a pseudo-differential common gate for generating a second voltage according to the reference voltage and the gain voltage; and a dynamic super source follower for forming a push-pull structure at the gate of the power tube according to the first voltage and the second voltage. The application can effectively improve the transient response performance of the voltage regulator.

The present invention relates to a digital amplifier for outputting a pulse-width-modulated output switching signal by amplifying a pulse-width-modulated digital input signal, the amplifier minimizing pulse error between the pulse-width-modulated digital input signal and a PWM pulse signal at the rear of a comparison unit according to audio information so that the distortion rate of an output audio signal can be alleviated and error amplifier characteristics can be enhanced, and being capable of minimizing wafer area and production costs when implemented as a semiconductor integrated circuit.

The invention relates to the technical field of integrated circuit design, in particular to a wide-loop broadband and high-frequency PSRR low-voltage linear voltage stabilizing circuit which comprises an error amplifier, two modules with frequency compensation FVF structures and a resistor array. The module of the first frequency compensation FVF structure receives a specific value output by the error amplifier, outputs feedback voltage and is used for increasing the transient response speed of the circuit; and the module of the second frequency compensation FVF structure receives the specific value output by the error amplifier, and outputs the working voltage to the load for improving the load bearing capacity of the circuit. The LDO design of a frequency feedback voltage (FVF) structure is adopted, and the performance of the high-frequency PSRR module is improved by expanding the loop bandwidth and enhancing the high-frequency PSRR module. By adopting the FVF structure, the load bearing capacity of the LDO is remarkably enhanced, and by introducing the high-frequency PSRR lifting circuit, the LDO is endowed with strong anti-interference performance within a specific frequency range.

A power supply controller controlling an output circuit of a switching power supply that generates an output voltage from an input voltage includes: an error amplifier generating an error signal according to an error between a feedback voltage corresponding to the output voltage and a predetermined reference voltage; a current sensor generating a current detection signal according to a coil current flowing the output circuit; a duty signal generation circuit generating a duty signal upon receiving the current detection and error signals; and a drive signal generation circuit generating a drive signal for the output circuit upon receiving the duty signal, wherein the error amplifier is switched, by a mode switching signal, between a first mode of generating the error signal using an integral voltage by integrating a difference value between the reference and feedback voltages, and a second mode of generating the error signal without using the integral voltage.

The present application relates to a frequency synthesizer with dynamically selected level shifting of an oscillating output signal. An oscillator circuit powered by a source voltage generates an oscillating output signal. The oscillating output signal is level shifted and applied to a first input of a multiplexer. A second input of the multiplexer receives the oscillating output signal. The multiplexer selects one of the oscillating output signal and the level shifted oscillating output signal to output as a selected oscillating output signal in response to a selection signal. A lock loop circuit controls a frequency of the oscillating output signal based on the selected oscillating output signal and a reference oscillating signal. The selection signal also selects one of the source voltage of the oscillator circuit and a reference voltage as an error amplifier reference voltage for a voltage regulator circuit that generates a first supply voltage.

A shunt regulator is provided which can reduce a consumption current at the time of normal operation even if a circuit including a large current flowing at the time of operation is included. The shunt regulator includes a capacitor connected between an output terminal and a ground terminal, a voltage dividing circuit and an output transistor connected between the output terminal and the ground terminal, an error amplifier which controls the output transistor based on a voltage of an output terminal of the voltage dividing circuit and a reference voltage, a nonvolatile memory, a memory control circuit which outputs a read signal of data to the nonvolatile memory, and a voltage detection circuit which detects that the voltage of the output terminal reaches a prescribed voltage which allows a data read operation of the nonvolatile memory, outputs a detection signal to the memory control circuit, and an operation current of the nonvolatile memory is supplied from the capacitor.

A current mode controller for a switching converter is provided. The controller includes an error voltage generator for generating an error voltage dependent on an output voltage and a reference voltage; a current sensing module; an error amplifier; and a control signal generator. The current sensing module senses a current flowing through an energy storage element, receives the error voltage, and generates a slope compensated sensed current signal dependent on the sensed current and the error voltage. The error amplifier receives the error voltage, generates an amplified voltage error signal by applying a first amplification coefficient dependent on the error voltage to the error voltage. The control signal generator generates one or more control signals to control the switching operation of one or more power switches of the switching converter, each of the control signals being dependent on the slope compensated sensed current signal and the amplified voltage error signal.