142results about How to "Improve transient response speed" patented technology

The invention discloses a low dropout regulator, which comprises an error amplifier, a buffer circuit, a P-channel metal oxide semiconductor (PMOS) regulation transistor, an N-channel metal oxide semiconductor (NMOS) push-pull tube, a voltage division feedback circuit, a compensation circuit and an output circuit, wherein the gate of the PMOS regulation transistor is connected with the output end of the buffer circuit, the source of the PMOS regulation transistor is connected with power voltage, and the drain of the PMOS regulation transistor is used as the output end of the low dropout regulator; the gate of the NMOS push-pull tube is connected with the output end of the error amplifier, the drain of the NMOS push-pull tube is connected with the drain of the PMOS regulation transistor, and the source of the NMOS push-pull tube is grounded; and the error amplifier, the compensation circuit, the buffer circuit, the PMOS regulation transistor, the voltage division feedback circuit and an output circuit form a main control loop, and the error amplifier, the compensation circuit, the NMOS push-pull tube, the voltage division feedback circuit and the output circuit form an auxiliary control loop. According to the low dropout regulator, the transient response of the regulator can be quickened, and the accuracy of output voltage can be improved.

The invention relates to a constant voltage constant current control circuit and a constant voltage constant current control method thereof, and is applied to a flyback converter. The constant voltage constant current control circuit generates a constant voltage / constant current control signal according to an output voltage feedback signal and an output current feedback signal to control the duty ratio of a switching signal of a main switching tube in the flyback converter and further ensure that the output voltage or output current of the flyback converter is kept constant. A circuit coupling control scheme is adopted, and then constant voltage or constant current control can be realized only by one capacitor, so that the constant voltage constant current control circuit has a simple structure; and moreover, the output voltage feedback signal which precisely represents the output voltage information of a secondary side and the output current feedback signal which precisely represents the output current information of the secondary side can be obtained by a voltage feedback circuit and a current feedback circuit, so that the constant voltage constant current control circuit is high in accuracy.

The invention discloses a low-power consumption broadband high-gain high-slew rate single-stage operational transconductance amplifier, which is formed by successively connecting a constant current bias stage, a differential input stage and a load current mirror transmission output stage in series. The load current mirror transmission output stage comprises eight N type MOS (metal oxide semiconductor) transistors from NM1 to NM8. Through the invention, the inherent limit restraint in a linear operational amplifying circuit is thoroughly solved, and the circuit performance under static AC small signals and dynamic big signals is comprehensively improved and enhanced.

The invention, belonging to the technical field of power supply management, discloses a low dropout linear voltage regulator, which comprises a power tube, a buffer, a first transconductance amplifier, a second transconductance amplifier, a current subtractor and a Miller compensation capacitor. The low dropout linear voltage regulator can remarkably increase slew rate and bandwidth of a common grid type error amplifier and enlarge the scope of the input common-mode voltage by three techniques of adaptive current bias, the current subtractor and capacitance coupling type dynamic charge and discharge, so that transient response speed of the linear voltage regulator is greatly increased and amplitude of the output voltage peak is reduced, meanwhile, good stability of a loop circuit is ensured.

The invention discloses a device applied to paralleled current sharing of a programmable DC power module and a paralleled current sharing method thereof. The paralleled current sharing method is based on the device applied to paralleled current sharing of the programmable DC power module. The device comprises a plurality of power modules which are connected in parallel and have the same specification and characteristic, a sampling circuit and a CPU (Central Processing Unit) processing circuit; the sampling circuit detects output voltages and current parameters of each power module in real time and transmits the output voltages and current parameters to the CPU processing circuit, after the output voltage and current parameters are processed by a CPU processor of the CPU processing circuit, a drive signal is output, so that the output of each power module circuit is controlled, and each power module outputs a balanced current finally. The device has the advantages of programmability, flexible control and strong universality, the hardware circuit can be simplified, the problems caused by component aging and temperature excursion of analog control are solved, the capacity of resisting disturbance is enhanced, and the reliability of the control system is improved.

A low dropout linear voltage regulator with a wide input voltage range comprises an error amplifier, a power tube, a voltage division network, a bias module, a buffer stage, a feed-forward access, a dynamic sampling module and an output detection module. The source electrode of the power tube is connected with the input voltage of the low dropout linear voltage regulator, and the drain electrode of the power tube generates an output signal of the low dropout linear voltage regulator; the voltage division network divides the output signal of the low dropout voltage regulator to obtain a feedback signal; the bias module is used for providing bias; the error amplifier pre-amplifies the difference voltage of the feedback signal and the reference voltage and transmits the pre-amplified difference voltage to the buffer stage and the feed-forward access at the back stage, and the two paths with different speeds of the buffer stage and the feed-forward path are converged at the grid end of thepower tube to charge and discharge to control the voltage at the grid end of the power tube; the dynamic sampling module can improve the transient response speed of the system; and the output detection module is used for detecting whether output is normal in real time.

The invention discloses a fast transient response low-dropout linear voltage regulator, relating to the integrated circuit technique. The linear voltage regulator comprises a reference circuit, an error amplifier and a CMOS conduction element and also comprises a comparator circuit, wherein the comparator circuit comprises a first comparator and a second comparator; the positive input ends of the first comparator and the second comparator are connected with a load output end; the negative input end of the first comparator is connected with a first reference level point A; the negative input end of the second comparator is connected with a second reference level point B; the level of the first reference level point A is higher than that of the second reference level point B; the output end of the first comparator is connected with a first switching tube; the output end of the second comparator is connected with a second switching tube; the input end of the first switching tube is connected with an external power supply, and the output end of the first switching tube is connected with the load output end; and the output end of the second switching tube is grounded, and the input end of the second switching tube is connected with the load output end. According to the linear voltage regulator disclosed by the invention, the static power consumption of the circuit is reduced, the circuit structure is simple, and the power consumption is low.

The invention discloses a bifrequency control method of switch power supply and a device thereof. A controller combines two groups of pulses with different frequencies to realize control of a switch convertor according to output state of the switch convertor. The invention is applicable to controlling of switch convertors of various topological structures and has the advantages that the control loop is simple and reliable, free of network compensation, fast speed in transient response and low noise in electromagnetic interference (EMI).

The invention relates to a low dropout regulator. The low dropout regulator comprises a feedback circuit, a reference voltage unit which is connected with the cathode of an error amplifier. A control end of a first on-element in the feedback circuit is connected with an output end of the error amplifier. An input end of the first on-element and an output end of the first on-element are respectively connected with a power supply and an output end of the regulator. A resistor branch and a circumscribed capacitor branch are connected between the output end of the regulator and ground in parallel. The resistor branch is provided with a first resistor and a second resistor. The first resistor and the second resistor are in series. The anode of the error amplifier is connected with the first resistor and the second resistor. The first resistor and the second resistor feed back signals. An output end of a second on-element is connected with the ground through a third resistor. An input end of the second on-element is connected with the output end of the regulator, and a control end of the second on-element is connected with the output end of the error amplifier. The problems that transmission voltage fluctuation is too large and stable time is too long caused by load current saltus step of the low dropout regulator are solved, static power consumption increase is reduced to a maximized degree, the circuit structure is simple, transient response speed and precision of low dropout regulator (LDO) circuits are greatly improved.

The invention belongs to the field of voltage stabilizers, the invention relates to a voltage stabilizer and particularly relates to a digital low-dropout voltage stabilizer. The stabilizer comprisesa voltage input end, a voltage output end, a first reference voltage input end, a second reference voltage input end, a third reference voltage input end, a voltage comparator, a transient detector, acoarse adjustment controller, a fine adjustment controller, a first transistor array, a second transistor array and a load capacitor. The stabilizer is advantaged in that a method of combining coarseadjustment and fine adjustment is adopted so that the transient response speed and precision are improved.

The invention discloses a transient voltage suppressor. The transient voltage suppressor is provided with a signal end and a grounding end. The transient voltage suppressor comprises a capacitive diode assembly and a first Zener diode, which are connected in series. The capacitive diode assembly comprises a first diode and a second diode, wherein the first and second diodes are formed in the same semiconductor chip and are in reverse parallel connection in the semiconductor chip. The transient voltage suppressor employs the capacitive diode assembly as a nonpolar capacitor element, thereby improving the transient response speed of the transient voltage suppressor.

The invention discloses a control method for a three-phase PWM rectifier suitable for power grid waveform distortion. The control method for the three-phase PWM rectifier suitable for the power grid waveform distortion mainly includes that extracting a current reference signal under input voltage distortion and unbalanced disturbance, and actively injecting negative-sequence current, improved dead-beat inner current loop which is forecast through combining with linear extrapolation, and outer direct voltage loop performed with active disturbance rejection control. The control method for the three-phase PWM rectifier suitable for the power grid waveform distortion plays roles of inhibiting the harmonic wave of the input current of the PWM rectifier, injecting proper negative-sequence current to eliminate the secondary power pulse of the output direct current voltage of the PWM rectifier, improving the transient response of the output direct current voltage, and compensating the influences of all kinds of delay on the dead-beat control. The control method for the three-phase PWM rectifier suitable for the power grid waveform distortion is capable of obviously reducing the secondary wave of the output direct current voltage under the disturbance of the input harmonic wave and unbalanced voltage, improving the transient response speed of the PWM rectifier, reducing the transient offset of the direct current voltage, and improving the system control precision.

The invention relates to a double-closed-loop feedback-control module, wherein two closed-loop control loops are formed in the starting process and the holding stage of a contactor to directly and accurately control the coil current of the contactor, so that the optimizing control for the integral action characteristic of the contactor can be carried out, and the integral performance index of the contactor is comprehensively improved. The double-closed-loop feedback-control module has low hardware cost, the voltage-adjusting rate of a system can be improved, the transient response speed of the system is increased, and the stability of the system is enhanced.

The invention discloses a double-pulse cross-cycle modulation method for a switching power supply and a device thereof. After an output voltage vo of a main circuit is detected by a voltage detection device, and then the value of the output voltage vo is compared with the value of a reference voltage Vref and a value obtained by subtracting an error value (Vr-eref) from the reference voltage; if the vo is more than the Vref, a comparator outputs a low-level signal; if the vo is more than the Vr-eref and is less than the Vref, the comparator outputs a corresponding low duty cycle pulse signal; if the vo is less than the Vr-eref, the comparator outputs a corresponding high duty cycle pulse signal; within a clock cycle, a pulse selector selects a high duty cycle pulse signal and a low duty cycle pulse signal from a pulse generator according to the output of the comparator, or the pulse signal is not output; two pulse signals with different duty cycles are adopted to serve as the driving of a switch device; the voltage ripple output by a system is relatively small, the dynamic range of the input voltage of a load is widened, the system stability is enhanced, and the transient response speed is increased.

The invention provides a quick transient response LDO (Low Drop Out) voltage stabilizer circuit based on an inverter. The quick transient response LDO voltage stabilizer circuit comprises a band-gap voltage reference source, an error amplifier, an inverter module and a power module, wherein the power module comprises a power tube, wherein a source electrode of the power tube is connected with input voltage; a drain electrode is output to output voltage of the LDO stabilizer circuit; a positive input end of the error amplifier is connected with feedback voltage; a negative input end of the error amplifier is connected with an output end of the band-gap voltage reference source; an output end of the error amplifier is connected with the inverter module; an input end of the inverter module isconnected with the output end of the error amplifier; and an output end of the inverter module is connected with a gate electrode of the power tube. The quick transient response LDO voltage stabilizer circuit disclosed by the invention has the advantages that under the premise of ensuring low power consumption, the transient response speed is effectively improved, the transient change of output voltage is reduced, and a linear adjustment ratio and a load regulation ratio are increased; and through performance simulation, the reliability of the performance of the circuit is proved, and the circuit has a giant application space in the field of low voltage power supply.

The invention discloses a multiway LED constant current controller and a control method. The multiway LED constant current controller is used for providing switch control signals to a power switch tube in a power-level circuit outside to control open-closed states of the power switch tube so as to enable the power-level circuit to generate constant current used for driving multiway LED lamp strings. The multiway LED constant current controller comprises a control loop which comprises a loop compensation network formed by multiple compensation signal maintaining elements. The multiway LED constant current controller connects the corresponding compensation signal maintaining elements in the control loop according to loaded states to enable the compensation signal maintaining elements to be respectively used for maintaining stable-state compensation signals of the control loop under different loaded states, and sets stable-state compensation signals when the loaded states change. By the multiway LED constant current controller and the control method, transient response speed when the loaded states change can be increased.

The invention provides a control method of a three-phase dual-active-bridge DC converter under a current optimal modulation. The method comprises a step of collecting DC side output voltage V2, DC side output current I2 and DC side input voltage V1 in each switch cycle, a step of multiplying the collected V2 by I2 to obtain a transmission power Po, at the same time multiplying V2 by a transformer transformation ratio N, dividing the above product by V1, and obtain a voltage transformation ratio d, a step of allowing Po and d to go through an optimal modulation strategy link to obtain the reference value D1* and D2* of duty ratios D1 and D2, and then obtaining the duty ratios D1 and D2 through two large inertia links or pure integrator links, a step of allowing the duty ratios D1 and D2 to go through an optimal amplitude limit value calculation link, and obtaining the optimal amplitude limit value Df_lim of a phase shift ratio, a step of carrying out difference comparison on a DC side output reference value V2ref and V2, allowing a difference to go through a PI regulator and an amplitude limit link with an amplitude limit value, and obtaining a phase shift ratio Df, and a step of obtaining the driving signal of each switch device according to the duty ratios D1 and D2 and the phase shift ratio Df, and driving a corresponding switch device.

The invention belongs to the technical field of power source management, and relates to an on-chip low dropout regulator with the fast transient response function. The on-chip low dropout regulator comprises an error amplifier, a power tube MP, a Miller capacitor CL, a first divider resistor and a second divider resistor, wherein the source electrode of the power tube MP is connected with input voltage VIN, and the drain electrode of the power tube MP is grounded after passing through a series structure of the first divider resistor and the second divider resistor; the negative input end of the error amplifier is connected with the reference voltage Vref, the positive input end of the error amplifier is connected with the series point of the first divider resistor and the second divider resistor, the output end is connected with the grid electrode of the power tube MP, and the Miller capacitor CL is connected between the drain electrode of the power tube MP and the ground; an error amplifier of an STCB structure is adopted, and a transient enhancing structure is inserted into the input stage of the error amplifier; a differentiator is connected between the grid electrode and the drain electrode of the power tube MP, and meanwhile a self-biasing structure is introduced into the LDO. Miller capacitance needed by loop compensation is substantially reduced while transient response speed is increased.

The invention discloses a capacitive diode assembly and a manufacturing method of the capacitive diode assembly. The capacitive diode assembly comprises a first conductive type of semiconductor substrate, a second conductive type of epitaxial layer which is arranged on the semiconductor substrate, a first conductive type of isolation area, a first conductive type of first doped area, a second conductive type of second doped area and an interconnection structure, wherein the second conductive type is different from the first conductive type; the first conductive type of isolation area; the first conductive type of isolation area penetrates through the epitaxial layer from the surface of the epitaxial layer and extends to the semiconductor substrate so as to restrict a first active area of a first diode and a second active area of a second diode in the epitaxial layer and separate the first active area and the second active area mutually; the first conductive type of first doped area extends to the epitaxial layer from the surface of the epitaxial layer in the first active area; the second conductive type of second doped area extends to the epitaxial layer from the surface of the epitaxial layer in the second active area; and the interconnection structure electrically interconnects a part of the isolation area in the first active area with a part of the epitaxial layer in the first active area. The capacitive diode assembly can be used as a non-polar capacity cell and can improve the transient response speed of a transient voltage inhibitor.

The invention discloses an error amplifier, a transconductance amplifier and a gain amplifier for composing a DC-DC converter. The error amplifier, the transconductance amplifier and the gain amplifier are characterized in that: the transconductance amplifier amplifies an absolute value of difference between a reference voltage and a feedback voltage, outputs a current proportional to the absolute value of difference between the reference voltage and the feedback voltage, and provides a dynamic bias current for the gain amplifier; the gain amplifier amplifies the absolute value of difference between the reference voltage and the feedback voltage, and outputs or absorbs a current proportional to the absolute value of difference between the reference voltage and the feedback voltage; and when the feedback voltage is less than the reference voltage, an output end of the gain amplifier outputs a current, and when the feedback voltage is greater than the reference voltage, the output end of the gain amplifier absorbs a current. The error amplifier, the transconductance amplifier and the gain amplifier effectively increase efficiency, load adjustment rate, linear adjustment rate and transient state response speed of the DC-DC converter, and have good application prospect.

The invention discloses a power supply rejection ratio and trainset response-enhanced LDO circuit. The LDO circuit comprises an LDO basic circuit, a PSR intensifier, and a transient intensifier; and each of the PSR intensifier and the transient intensifier is connected with the LDO basic circuit. A gate end of a power tube in the LDO basic circuit is connected with a capacitance-adjustable negative capacitor by utilizing the PSR intensifier, the negative capacitor can reduce a gate source dynamic voltage of the power tube as zero, thereby effectively reducing the leakage current of a small power tube, inhibiting the noise of an external input power supply, and improving noise inhibition performance of the LDO circuit, and the LDO circuit has the advantages of being simple in structure andhigh in power supply rejection ratio, and the LDO circuit has the advantages of being simple in structure and high in power supply rejection ratio; and meanwhile, a first detection capacitor and a second detection capacitor in a voltage detection circuit are used for detecting voltage change of an output end of the LDO circuit in real time; the charging / discharging current is provided for the gateend of the power tube through an embedded transient intensifier, the transient response speed of the LDO circuit is effectively improved, and the overshoot voltage and the pitching voltage output bythe LDO circuit are reduced.

The invention provides a BOOST circuit for improving transient response and an application method of the BOOST circuit, the BOOST circuit comprises a BOOST converter for generating an output voltage higher than an input voltage, a current sampling module for generating a current detection signal, a switching device for controlling the on-off of a PWM modulation signal, and a control unit for generating a PWM modulation signal under the action of a reference voltage, a voltage feedback signal of an output voltage, a current detection signal and a slope compensation voltage and generating a modulation signal with a preset duty ratio in a set time period, and an output voltage slope sampling module for sampling the descending slope of the output voltage in the turn-off time of a switching device. According to the invention, the time for changing the inductive current to the final load current can be reduced, so that the transient response speed of BOOST is improved, and the stability of the system is ensured.

The invention discloses a low dropout linear voltage regulator capable of increasing transient state response speed. The low dropout linear voltage regulator comprises a transconductance amplifier, atrans-resistance amplifier, a current sampling circuit, a feedback resistance, a switch and a frequency compensation network. The low dropout linear voltage regulator disclosed by the invention adoptstwo working modes, namely double loop feedback control and single loop voltage feedback, when requirement on the transient state response speed is relatively high, the low dropout linear voltage regulator selects the current sampling circuit, the transconductance amplifier and the trans-resistance amplifier to be accessed into a feedback loop by virtue of switch control and selects the frequencycompensation network in the double loop feedback control mode for carrying out loop compensation, so that the transient state response speed of the low dropout linear voltage regulator is improved; and when the requirement on power consumption is relatively strict, the low dropout linear voltage regulator shuts off the current sampling circuit, shuts off the trans-resistance amplifier and is directly accessed into a loop by virtue of the transconductance amplifier, so as to form the single loop voltage feedback mode; and a single loop frequency compensation network is selected for carrying outthe frequency compensation, so that the power consumption of the low dropout linear voltage regulator is further reduced.

A time signal generator and a time generating method used in a power converter are provided. The time generating method includes following steps. An error delay signal is generated according to an error signal, wherein the error signal is related to an output voltage of the power converter. A time signal is generated according to the error signal and the error delay signal. The time signal may serve to improve a response speed of the power converter.

The invention discloses a back porch sampling circuit and a method for sampling back porch falling edging voltage. The back porch sampling circuit comprises a counting circuit, a detection circuit and a computing circuit, wherein the counting circuit is used for counting zero passage times and bottom number of a ring wave on a high frequency transformer auxiliary winding; the detection circuit is used for detecting time tvcn from turn-off of a switch element to nth zero passage of the ring wave or time tvan from the turn-off of the switch element to nth bottom of the ring wave; the computing circuit is used for figuring out time Tdis from the turn-off of the switch element to beginning of back porch falling edge of the ring wave; and n is nonnegative integer. According to the back porch sampling circuit and the method for sampling back porch falling edging voltage, the back porch sampling circuit can rapidly obtain control signals with high-precision stable voltage and constant current, is not influenced by temperature and can rapidly follow change of load and electric supply voltage, so that precision for stable voltage and constant current can be improved, and the transient response speed can be increased.

A method for amplifying a burst optical signal, a burst optical amplifier and system, and a communications system are provided according to embodiments of the present invention. The method includes: combining an auxiliary light and a signal light into a mixed light and outputting the mixed light, where the auxiliary light is a non-burst light, the signal light is a burst light, and power of the auxiliary light is set to be independent from power of the signal light; generating a pump light; and combining the pump light with the mixed light and inputting the combined light into a gain medium, so as to obtain an amplified mixed light. Present invention has the following advantages: reducing the delay time of enabling the burst optical amplifier, improving the transient response speed of the burst optical amplifier, and preventing the generation of a surge phenomenon, so as to prevent the generation of signal distortion.

The invention discloses a disperse phase-shifting angle control technique and a device of a phase-shifting full-bridge DC-DC (Direct Current-Direct Current) converter. A controller generates two complementary signals P1 and P2 with dead zone time as driving pulse signals of two switching tubes on an advanced bridge arm; the controller performs phase-shifting processing on the two signals P1 and P2 to generate two groups of signals P3H and P3H as well as P3L and P3L with different phase-shifting angles; and the controller directly selects appropriate signal outputs from the two groups of signals P3H and P3H as well as P3L and P3L as effective driving pulse signals of two switching tubes on a lagging bridge arm according to an output state of a switching converter to achieve control of the phase-shifting full-bridge DC-DC converter. The control technique and the device have the advantages that a control loop is simple and reliable; no compensating network is required; and the transient response speed is high.

The invention discloses a multi-phase switch converter and a control circuit and control method of the multi-phase switch converter. The multi-phase switch converter comprises a plurality of switching circuits, and the output ends of the switching circuits are coupled together for providing output voltages. The control circuit comprises an input end and a plurality of output ends, the input end is coupled to the output ends of the switching circuits to receive the output voltages, the output ends provide a plurality of switch control signals to control the switching circuits to be powered on in sequence, when overshoot is detected to happen to the output voltages, the current switch switches are powered off temporarily through the control circuit, and when the output voltages are restored to be normal, the current switch switches continue to be powered on by the control circuit so that the total powered-on duration of the current switching circuits can be equal to a preset powered-on duration.