214results about How to "Small quiescent current" patented technology

The invention relates to an intelligent lithium ion battery management system for an electric vehicle. The management system is characterized in that a microcontroller module is connected with a power supply module, a data detection module, a charge-discharge control module, a safety protection module, a communication module, a data storage module and a balance management module. The balance control method comprises the following steps: carrying out balance self-inspection according to each collected single cell voltage data in a cell unit; if the balance self-inspection is successful, judging whether to start balance control; if the difference between the single cell voltage and the average value voltage is larger than a preset threshold voltage and the voltage of a certain single cell is larger than a preset threshold, carrying out balance control with PWM duty ratio obtained based on the single cell voltage being as balance time; or otherwise, giving up carrying out the balance control. The management system in the invention is a centralized battery management system, and has the advantages of small size, stable performance, high detection precision, low cost and high reliability and the like.

The invention relates to an automobile power supply management system. Firstly, by monitoring the state of the storage battery, the application state of an electrical apparatus used in an entire automobile is controlled, simultaneously the generation power and the output power of a generator is controlled, and the state information of the storage battery is provided to a driver, thereofore maximally optimizing the electric balance of the entire automobile; besides, the static current of the entire automobile is controlled, and the consumption of the electric quantity of the storage battery caused by the static current is reduced, ensuring the time for normally starting after the automobile stops, as well as optimizing the charging and discharging state of the storage battery and prolonging the service life of the storage battery.

The invention discloses a high efficiency constant current LED drive circuit and a drive method. The drive circuit comprises a resistor R1 and a stabilizer tube Z1 which are connected in series, a first capacitor C1 connected in parallel with the stabilizer tube Z1, and a freewheeling diode D1 and an inductor L which are connected in series at the two ends of a load LED. The drive circuit also comprises a power switch MOS transistor which has a grid connected with the cathode of the stabilizer tube Z1, a drain electrode connected between the inductor L and the freewheeling diode D1 and a source electrode connected with the anode of a current feed diode D2 of which the cathode is connected with the cathode of the stabilizer tube Z1, and a source electrode drive control circuit which is connected between the source electrode of the power switch MOS transistor and a sampling resistor RCS so as to adaptively control the power switch MOS transistor from the source electrode. The drive circuit consumes lower current and reduces the voltage on a power supply circuit, thereby reducing the power consumption, improving the efficiency, simultaneously generating a self-adapting turnoff time which is inversely proportional to an output voltage, and realizing the constant current output.

The invention discloses a self-adapting current multiplication circuit and a low-dropout-voltage linear voltage regulator integrating the circuit. Firstly, constant bias voltage of an NMOS transistor and constant bias voltage of a PMOS transistor are generated through a constant bias voltage generating circuit, and then a lagging current comparator collects small part of load current which is compared with constant current; when a load is in a light load, the lagging current comparator shuts off a self-adapting current multiplication generating circuit, self-adapting current multiplication voltage VBPA rises, the bias current of an operational amplifier of the low-dropout-voltage linear voltage regulator lowers, in this way, stability is guaranteed, and quiescent dissipation is reduced; when the load is in a heavy load from a moderate load, the lagging current comparator turns on the self-adapting current multiplication generating circuit, the self-adapting current multiplication voltage VBPA lowers, the bias current of the operational amplifier increases to the specific times the bias current of the operational amplifier during the light load, the gain bandwidth product of the low-dropout-voltage linear voltage regulator increases, and transient response performance is enhanced.

The invention discloses a control circuit as well as a switch converter and a control method thereof. The switch converter comprises a power switching tube and a synchronous rectifying tube; the control circuit controls the power switching tube and the synchronous rectifying tube to be conducted and switched off; and when a control signal of a power saving mode is at an effective state, the conduction of the power switching tube is controlled through a comparing result of a feedback signal of output voltage and reference voltage, and a zeroing detection signal of current flowing through the synchronous rectifying tube, so that an extra over-current protection circuit is not needed, static current of the switch converter at the power saving mode is reduced, and the power of the switch converter at the power saving mode is improved.

The invention relates to an intelligent switch adopting a single firewire to obtain power and a control method. The intelligent switch comprises a wireless receiving and sending module, a processor, a single firewire power supply module and a thyristor control module, wherein the wireless receiving and sending module is connected with the processor, and the processor is connected with the single firewire power supply module and the thyristor control module respectively; the wireless receiving and sending module is used for receiving an external wireless control signal and transmitting a control state signal to an external terminal for switch control state display; the processor processes the external wireless control signal, generates a connection signal and a cut-off signal and sends the control state signal read from the thyristor control module to the wireless receiving and sending module; the single firewire power supply module obtains power through the single firewire and supplies current to the processor and the thyristor control module; the thyristor control module is used for accessing external alternating current and supplying alternating current to electric equipment or stopping supplying the alternating current to the electric equipment and is further used for generating a control state signal according to connection and stopping conditions. Compared with the prior art, the intelligent switch adopts wireless control, wire arrangement is convenient, and the operation is stable.

The invention is suitable for the field of semiconductor devices and provides a high-speed low-power consumption latch device capable of resisting SEU (single event upset). The latch comprises a first latch unit and a second latch unit, which are cross-coupled, wherein a clock signal of the first latch unit is opposite to the clock signal of the second latch unit; a data signal of the first latch unit is opposite to the data signal of the second latch unit; when a stored data value at a sensitive point of the first latch unit upsets, the stored data value at the sensitive point of the first latch unit is recovered by the second latch unit through feedback; and when the stored data value at the sensitive point of the second latch unit upsets, the stored data value at the sensitive point of the second latch unit is recovered by the first latch unit through feedback. In the invention, a redundancy storage node is introduced in the high-speed low-power consumption latch device capable of resisting SEU under a common process condition, and when a node upsets, the voltage of the node can be recovered from other nodes through feedback.

The invention discloses a light-load transient enhanced circuit and a low-voltage-difference linear voltage stabilizer integrated with the circuit. The light-load transient enhanced circuit comprises a dynamic bias voltage generation circuit, a load current control switch, a voltage stabilizing capacitor, a discharging circuit and an output circuit; when the light-load transient enhanced circuit has a light load, no static current is consumed; when the low-voltage-difference linear voltage stabilizer is switched to the light load from a heavy load, gradually-reduced load current is provided by the light-load transient enhanced circuit, and the establishing time of the low-voltage-difference linear voltage stabilizer is greatly shortened, so that the problem that the establishing time for switching the current low-voltage-difference linear voltage stabilizer from the heavy load to the light load is too long is solved; secondly, extra auxiliary circuits are not needed so that the structure is simple and the transient response performance of the low-voltage-difference linear voltage stabilizer can be enhanced when the load is light, and furthermore, the light-load transient enhanced circuit can be applicable to ultralow-power-consumption medical electronics application.

The invention provides a novel CANBUS network control method for integrated automotive electronic device CANBUS network, and relates to an integrated automotive network topology structure, a network management policy, network management and ID allocation. The system comprises a high-speed CAN bus and a plurality of CAN nodes electric control unit connected with the CAN bus, and is characterized in that the insides of the CAN node electric control units at utmost two ends of the high-speed CAN bus are connected with two serially-connected terminal resistors respectively; the system controls the initialized time and temporary time leaving the bus of each CAN node control unit; nodes are divided into main nodes, +30 nodes and +15 nodes; when +15 wires are not electrified, CANS of all +15 nodes do not work; when the +15 wires are electrified, all the +15 nodes are waken up; and under the condition that the +30 wires are electrified and the +15 wires are not electrified, the main nodes can wake up a CAN bus of +30 nodes. In the invention, an automotive network topology graph has strong expandability and flexibility, so as to meet the diversity of the same series automobile type configuration; and a network managing mode ensures the reduced integrated automobile static current and the real-time and order of the integrated automotive network. The ID allocation mode makes the utilization rate of the network maximized, and guarantees the high efficiency and the real-time of transmission information, and reduces the network load factor.

The invention relates to a charge pump circuit, which comprises a drive and switch unit, a comparison unit, a load detection unit, a detection time sequence processing unit and a clock unit; the drive and switch unit is used for performing the voltage transformation on the basis of a clock signal and a comparison result and outputting the output voltage; the comparison unit is used for comparing a feedback voltage with a first benchmark voltage and outputting the comparison result to the drive and switch unit; the feedback voltage is correlated to the output voltage; the load detection unit is used for detecting a load electric parameter of the charge pump circuit and outputting a load information signal; the detection time sequence processing unit is used for receiving the load information signal and outputting a load judging signal; the load judging signal is correlated to a working mode of the charge pump circuit; the clock unit is used for receiving the load judging signal and outputting a clock signal, the clock signal is a first clock signal or a second clock signal, and the frequency of the first clock signal is higher than that of the second clock signal. Due to the adoption of the charge pump circuit, the static current of the charge pump circuit can be effectively reduced.

The invention relates to a large-scale integrated circuit, and provides a LDO (low dropout regulator) capable of outputting ultra-low quiescent current in a self-adaptation way. An LDO circuit can maintain high stability under the wide-range load condition, and has the characteristics of ultra-low quiescent current and fast response particularly under the load-free condition. Therefore the LDO has the technical scheme that the LDO capable of outputting ultra-low quiescent current in the self-adaptation way consists of two gain amplification stages, two CMOS (complementary metal oxide semiconductor) power transistor loops, a feedback loop, an overshoot reducing loop and a frequency compensation loop, wherein input signals are input by an inverted input end of the first gain amplification stage and are then output sequentially through the second gain amplification stage and the first CMOS power transistor loop, and the output of the first gain amplification stage is directly output to the output end of the first CMOS power transistor loop through the second CMOS power transistor loop. The large-scale integrated circuit is mainly applied to the design manufacturing of large-scale integrated circuits.

The invention provides a novel CANBUS network control system for an integrated automotive electronic device, and relates to an integrated automotive network topology structure, a network management policy, network management and ID allocation. The system comprises a high-speed CAN bus and a plurality of CAN nodes electric control unit connected with the CAN bus, and is characterized in that the insides of the CAN node electric control units at utmost two ends of the high-speed CAN bus are connected with two serially-connected terminal resistors respectively; the system controls the initialized time and temporary time leaving the bus of each CAN node control unit; nodes are divided into main nodes, +30 nodes and +15 nodes; when +15 wires are not electrified, CANs of all +15 nodes do not work; when the +15 wires are electrified, all the +15 nodes are waken up; and under the condition that the +30 wires are electrified and the +15 wires are not electrified, the main nodes can wake up a CAN bus of +30 nodes. In the invention, an automotive network topology graph has strong expandability and flexibility, so as to meet the diversity of the same series automobile type configuration; and a network managing mode ensures the reduced integrated automobile static current and the real-time and order of the integrated automotive network. The ID allocation mode makes the utilization rate of the network maximized, and guarantees the high efficiency and the real-time of transmission information, and reduces the network load factor.

The invention discloses an electronic parking brake system and a method for waking up the system in a sleep mode, and relates to the field of automobile electronic parking brake systems. The system comprises an EPB switch, an EPB controller and an EPB actuator; an input end of the EPB controller is connected with the EPB switch; an output of the EPB controller is connected with the EPB actuator; and the EPB controller comprises a single chip, a power chip, an ASIC chip, a sensor, an EEPROM and an H bridge. According to the method for waking up the electronic parking system in the sleep mode, awake-up function in the sleep mode is realized through an action state of a combined button in the EPB switch; the power chip periodically supplies power to the external EPB switch by utilizing a high-side switch integrated in the power chip; in an electrification process of the EPB switch, the system can be waken up when any button acts; and in the sleep mode of the system, the main chips such as the single chip and the like are completely power off to stop operation, thereby effectively reducing the quiescent current of the system and prolonging the life of a hardware system.

The invention discloses an adjustable latch resisting single event upset and transient effect delay. The latch comprises a first delay unit, a second delay unit, a first latch unit, a second latch unit, and a third latch unit. Through adjusting bias voltage of the delay units, delay of the first delay unit and the second delay unit can be respectively changed, so as to change establishing time of data signals of the latch, and effectively reduce and even prevent wrong data latching caused by single-particle transient effect in an input data signal passage. Through arranging a redundant storage node, voltage of a node can be recovered through the other two nodes by feedback when the node upsets. To sum up, the adjustable latch can realize single event upset resistance under an ordinary commercial process, and latch establishing time can be changed through the adjustable delay units, so that the transient effect on data paths is effectively restrained.

The invention discloses a low power consumption control method and system of a CAN node, and a controller. The control method comprises the following steps: the CAN node automatically enters a wake-up mode after being electrified, and keeps the wake-up mode when a sleep condition is not satisfied; when the CAN node satisfies the local sleep condition and the whole CAN network is in cooperative sleep, the CAN nodes disenables a CAN physical layer transceiver and enables a CAN signal and an MCU internal timer to serve as a wake-up resource, and the CAN node enters the sleep mode; when the MCU internal timer or the CAN signal wakes up the MCU, the CAN node enters a temporary wake-up mode; in the temporary wake-up mode, the CAN node is controlled to enter the sleep mode or a wake-up confirmation mode again by polling a wake-up state bit and the level of a local wake-up signal within a temporary wake-up time; and in the wake-up confirmation mode, whether an effective CAN message and a local wake-up signal is detected to control the CAN node to enter the wake-up mode or the sleep mode.

The invention discloses a low-voltage nanowatt-scale full CMOS current mode reference voltage source. The reference voltage source is characterized by comprising a starting circuit, an IPTATa reference current source circuit, an IPTATb reference current source circuit and a temperature compensating circuit, wherein the starting circuit is connected to the IPTATa reference current source circuit and the IPTATb reference current source circuit and is used for supplying current when the reference voltage source is started so as to deviate the reference voltage source from a degeneration bias point; the IPTATa reference current source circuit and the IPTATb reference current source circuit respectively generate a bias current to supply current bias to the temperature compensating circuit; and the temperature compensating circuit is used for making difference on the two bias currents in different multiples to obtain a temperature-irrelevant reference current and driving an MOS pipe in the temperature compensating circuit to obtain an output voltage which is not influenced by the supply voltage and the temperature change. The reference voltage source has the characteristics that the power consumption is low, the layout area is small, devices are matched with a standard CMOS process, the temperature coefficient is low, and the suppression ratio of the supply voltage is high.

The invention discloses an electronic product protective sleeve provided with a flashlight. The protective sleeve comprises a protective sleeve casing, a photosensitive element, at least one light-emitting element and a control circuit driving the light-emitting elements to flash, wherein the photosensitive element, the light-emitting elements and the control circuit are fixed on the protective sleeve casing; when a mobile phone is matched inside the protective sleeve casing, the position of the photosensitive element corresponds to the position of a flashlight of the mobile phone; and the flashlight of the mobile phone triggers the photosensitive element so as to trigger the control circuit to drive the light-emitting elements to flash. According to the protective sleeve, a design of integration of the flashlight with the protective sleeve of the mobile phone is adopted, so that the protective sleeve is small in size and convenient to carry; the protective sleeve is triggered through the flashlight of the original mobile phone, is quick in reaction speed and synchronizes with the flashlight of the original mobile phone, no software is required to be installed in the mobile phone, and an operation mode is identical with that of the original mobile phone; an independent battery is arranged inside, power supplied to the mobile phone is not affected, when the flashlight does not work, the quiescent current is extremely small, and the working time is greatly prolonged.

The invention discloses a power circuit of an electric automobile central control system and an achievement method thereof. The circuit includes a first MOS transistor, a first direct-current chopper, a power supply management unit, a multimedia processing system, a single chip microcomputer, a first line voltage stabilizer, a second linear voltage stabilizer, a CAN chip, a second MOS transistor, a logic or gate, a 4 G communication module, a second direct-current chopper, a third linear voltage stabilizer, a battery signal terminal, a hardwire signal terminal, an enabling signal terminal, a high-level CAN bus terminal and a low-level CAN bus terminal. The power circuit can perform system wakening through a hardwire signal, can also meet the demand for remote hibernation or wakening and the demand for CAN hibernation or wakening, is more comprehensive in function, simple in structure and low in cost, can make the first MOS transistor and the second MOS transistor in a cut-off state during hibernation and reduce quiescent current in the mode that the hardwire signal terminal is in a suspended state and can be widely applied to the field of power supplies.

The invention discloses an auxiliary LDO circuit and a switching circuit. The auxiliary LDO circuit comprises a band-gap reference circuit used for generating reference voltage, and a first negative feedback circuit used for powering a load. The first negative feedback circuit is connected with the band-gap reference circuit. The auxiliary LDO circuit further comprises a first power supply output end used for powering a load. The first power supply output end is connected with the first negative feedback circuit.In a chip system, the band-gap reference circuit offers reference voltage to the first negative feedback circuit when a digital circuit is in the sleep state. The load is supplied with power via the first power supply output end. Due to the fact that all devices of the auxiliary LDO circuit work in a sub-threshold region, an MOS tube consumes low quiescent current in the sub-threshold region in the band-gap reference circuit such that little power consumption is generated by the overall circuit, thereby saving electric energy.

The invention discloses an active magnetic suspension control system and control method for a three-floated gyro. The active magnetic suspension control system comprises a magnetic suspension element, a first floater position detection resistor group, a second floater position detection resistor group, an analog signal conversion circuit, a multipath gating device, a controller, a first excitation / stressing control switch block and a second excitation / stressing control switch block, wherein the magnetic suspension element, the first floater position detection resistor group and the second floater position detection resistor group form five paths of Wheatstone test bridges. According to the control method disclosed in the invention, the control period of the controller is divided into a position signal sampling period Tc, a stressing period Tf and a restore and waiting period Td. With the control system and method, five degrees of freedom of the floaters of the three-floated gyro can be controlled, and precision and centering of the three-floated gyro can be realized. The control system controls displacement of the magnetic suspension element through single-side magnetic pole stressing and employs a state decoupling control method, so precision of the three-floated gyro can be improved.

The invention provides an automobile transportation mode control device, which comprises an automobile body controller, a transportation mode switch, a relay, an instrument, and controllers with static current, such as an air conditioner controller and a lamp controller. The transportation mode switch totally has two states including a switch switch-off state and a switch switch-on state. When the transportation mode switch is switched on, the automobile body controller detects a high level, the current mode is judged to be a common mode, when the output end of the control relay is in a low level state, the relay does not suck, and the whole automobile normally works; when the transportation mode switch is switched off, the automobile body controller cannot detect the high level, the current mode is judged to be a transportation mode, if the whole automobile network is in a wakening state, or a key is in a non-off gear, the automobile body controller controls to suck the relay, and the whole automobile normally works; after the whole automobile network is in a dormancy state, or the whole automobile is in an off gear for more than 10s, the automobile body controller controls to output a low level, the relay is switched off, and the static current consumption of the whole automobile is reduced. The control device provided by the invention has the advantages that the active management on a vehicle-mounted controller in an automobile transportation process can be realized, the static current consumption of the automobile in the transportation process is reduced, the storage battery discharging quantity is obviously reduced, and the starting failure risk after the automobile achieves a transportation destination is reduced.

The invention relates to a distributed automobile electric energy regulating method and belongs to the technical field of automobile electric energy control. Static electric energy is regulated: when a vehicle is in a standing state, controllers meeting the conditions first enter a primary sleep state; if a message is not detected during a certain time, the controllers having entered the primary sleep state are ordered to enter a secondary sleep state, a storage battery closes power supply of related loads according to different states of the current vehicle and makes related control units enter a sleep mode, a quiescent current is lowered, and the standing time is improved. Dynamic electric energy is regulated when the vehicle runs, and the state of the storage battery is detected; if it is detected that the storage battery is in a negative balance state, real-time state data of the vehicle are collected and compared with a set threshold, current-using equipment does not meet the set threshold is shut down, and a generator is made to continuously supply power to the storage battery. Through the mode, negative balance does not occur in electric energy consumed by an electric energy output device and electric appliance loads, and it is guaranteed that feed does not occur in the storage battery.

The invention provides a low-drop-out voltage regulator. The voltage regulator comprises a power tube, an error amplifier, an operational amplifier, a control transistor and an output end VO. The source of the power tube is connected with the power supply end, the drain is connected with the output end VO, the grid is connected with the output end of the error amplifier, the first input end of the error amplifier is connected with the drain of the power tube, and the second input end of the error amplifier is connected with a first reference voltage. The first input end of the operational amplifier is connected with the output end VO, the second input end is connected with a second reference voltage, the output end is connected with the control end of the control transistor, one connection end of the control transistor is connected with the drain of the power tube, and the other grounding end of the control transistor is connected with the grounding end. Compared with the prior art, a second feedback loop is added to adjust the output voltage and offset leakage power of the power tube, and accordingly, the static current of the low-drop-out voltage regulator can be reduced.

A window voltage comparison device comprises a sequential circuit, a voltage comparison circuit and a logic processing circuit. The sequential circuit performs frequency demultiplication on an input clock signal clk to obtain a second clock signal and a third clock signal and outputs the second clock signal and the third clock signal to the voltage comparison circuit; the voltage comparison circuit comprises a selector and a comparator, and the selector outputs a lower threshold voltage limit or an upper threshold voltage limit according to the control of the second clock signal and the third clock signal; the comparator compares the lower threshold voltage limit or the upper threshold voltage limit output by the selector with a voltage to be detected and outputs comparison results to the logic processing circuit; and the logic processing circuit performs logic processing on the comparison results output by the voltage comparison circuit according to triggering of the input clock signal clk and outputs processing results. The window voltage comparison device has the advantages of being small in occupied circuit area, good in consistency and low in static current.

The invention discloses a double-ring protection low drop out (LDO) linear voltage regulator comprising the following elements: an error amplifier used for switching dual-end input into single-end output, thus providing high output gain; an over-current protection circuit used for comparing output voltage with peak voltage, and using a feedback circuit to control a power tube, thus realizing over-current protection function; the power tube realized by a PMOS transistor common-source amplifier structure and used for providing sufficient gain for the LDO loop, and ensuring the LDO drop out voltage is the PMOS pipe leakage source voltage; a unit gain frequency compensation network used for generating zero point resistance. The conduction resistance of the PMOS pipe critical work point can be reduced to drop voltage, thus providing over-current protection effect, and the error amplifier can normally work; good stability is provided; the double-ring protection low drop out (LDO) linear voltage regulator has low input-output voltage difference, can stably work when voltage and temperature change, and has the over-current protection auxiliary function.

The invention provides a DC-DC converter. The converter comprises an output circuit which comprises an inductor, a first power transistor, and a second power transistor; and a control circuit which isconfigured to enter a dormant state from a monopulse mode when the load is lower than a preset value and the output voltage is larger than or equal to a first proportion of a set standard value, andreturn to the monopulse mode from the dormant state when the load is higher than the preset value or the output voltage is smaller than or equal to a second proportion of the set standard value; and in each period of the monopulse mode, the first power transistor is controlled to be switched on, the second power transistor is controlled to be switched off, then the first power transistor is controlled to be switched off, the second power transistor is controlled to be switched on, and when the inductive current reaches zero, if the period of the monopulse mode is not ended, the circuit entersan idle state. Therefore, ripples of the output voltage can be effectively reduced, and a dormant state can be entered when the load is extremely light, so that the quiescent current of the circuit isgreatly reduced.

The invention discloses a high-precision current mode reference voltage source. The high-precision current mode reference voltage source comprises a starting circuit, a CTAT reference current source circuit, a PTAT reference current source circuit and a temperature compensation circuit. A passive resistor, a diode or a triode is not used, the high-precision current mode reference voltage source iscompatible to a CMOS process, layout area is greatly reduced, the production cost is reduced, the power consumption is low, and meanwhile, the power supply rejection ratio is high, and the temperature drift coefficient is low.

A low dropout regulator with embedded reference belongs to the technical field of analogue integrated circuits. Base-emitting electrode voltage of an NPN transistor works as negative temperature coefficient voltage and resistance voltage works as positive temperature coefficient voltage; temperature compensation is achieved via a band-gap reference method; a band-gap reference is formed by an NPNtransistor and resistors in a feedback loop of a low dropout regulator; an error amplification channel is established, so a low-temperature coefficient power supply conversion function can be realizedfor the low dropout regulator. The low dropout regulator has functions of a reference voltage source, and can be integrated to a chip for internal power supply; low static currents can be maintained;compared with the low dropout regulators in the prior art, power supply conversion can be realized with few transistors; and low power consumption is required.

The invention discloses a transiently-responding improved circuit for a low-dropout linear regulator. The transiently-responding improved circuit comprises a first PMOS tube P1, a second PMOS tube P2,a third PMOS tube P3, a fourth PMOS tube P4, a fifth PMOS tube Mp, a first NMOS tube N1, a second NMOS tube N2, a third NMOS tube N3, a fourth NMOS tube N4, a fifth NMOS tube N5, a first resistor R1,a second resistor R2, a third resistor RL, a first capacitor CL, a first voltage Vn1, a second voltage Vn2, a third voltage Vpu, a fourth voltage Vpd, a first current I1, a second current I2, a thirdcurrent I3, a fourth current I4, a first input voltage Vin, a first output voltage Vout and a first ground GND. The transient response of the LDO is improved, and overshoot and undershoot are automatically reduced according to a circuit state. A transistor of the transiently-responding improved circuit works in a stable state in a cutoff zone, the static current can be effectively reduced, and the efficiency of a power supply can be improved. The transiently-responding improved circuit adopts common electronic devices and is simple and low in cost.