399 results about "Dropout voltage" patented technology

The invention, which relates to the technical field of energy storage and discharge, provides an energy storage and discharge system comprising a power supply input interface, a slow power-on unit, a slow power-on control unit, an energy storage unit, a start-stop control unit, a sampling unit, a detection unit, a main loop switch unit and an output interface. The power supply input interface is connected with the input end of the main loop switch unit and the input end of the slow power-on unit, the output end of the slow power-on unit is connected with the first port of the slow power-on control unit, and the output end of the main loop switch unit and the second port of the slow power-on control unit are connected with the port of the energy storage unit. The sampling unit is connected with the input end of the detection unit, and the output end of the detection unit is connected with the control end of the main loop switch unit. According to the invention, the problem of'maloperation 'protection of the power supply due to increase of the switching voltage difference in the process of switching the main loop can be avoided, and the reliability of the energy storage discharge system is improved.

The invention relates to the technical field of power electronic control, and provides a soft start control method for a three-phase PFC (Power Factor Correction), a PFC controller and a power supply system.The soft start control method comprises the steps that when a PFC start instruction is received, an initial target voltage value is set as an actual value of current bus voltage; maintaining the initial target voltage value for a first preset duration; after the initial stable state, sampling in real time to obtain the actual value of the current bus voltage, and calculating the absolute value of the voltage difference between the actual value of the current bus voltage and the current target voltage value; judging whether the absolute value of the voltage difference is smaller than or equal to a preset trigger threshold value; if yes, adding a preset voltage step value to the current target voltage value; if not, keeping the current target voltage value unchanged; and recursive control of the current bus voltage is executed circularly until the updated current target voltage value reaches the final target voltage value. According to the mode, the starting rapidity and the stability of the boosting process are balanced.

Load sharing techniques for voltage regulators. In an example, the techniques may be implemented in an LDO voltage regulator configured to provide load sharing with a single driver for internal and external pass elements using a pair of variable voltage dividers to adjust the load sharing based on load current. In other examples, a calibrated voltage source can be used to replace one of the variable voltage dividers. Calibration circuitry and methodologies for determining the value of the calibrated voltage source are also described. In still other examples, a single variable voltage divider can be used, with no calibrated voltage source, by constraining the external pass element to be weaker than the internal pass element. In any such examples, the internal and external pass elements can be implemented, for instance, with either n-type or p-type power transistors, and with similar transistor technologies or diverse transistor technologies (e.g., FETs and BJTs).

The invention provides a voltage difference monitoring device and method for a bootstrap switching power supply and the switching power supply. The device comprises a voltage difference detection module which is configured to detect the voltage difference between the two ends of a bootstrap capacitor and generate a lower tube conduction indication signal if the voltage difference does not reach a set threshold value; the lower tube forced conduction module is configured to generate a plurality of continuous pulse signals according to the lower tube conduction indication signal so as to conduct a lower transistor when the pulse signals are in high level, so that the bootstrap capacitor is charged through the first power supply voltage until the voltage difference reaches a set threshold value; and the negative current detection module is configured to send a forced turn-off signal to the lower transistor forced turn-on module and end the turn-on period, corresponding to the current pulse signal, of the lower transistor if a negative current greater than a threshold value is detected during the period of turning on the lower transistor through the pulse signal. According to the invention, high differential pressure detection precision is realized through a simple circuit structure.

The utility model, which relates to the technical field of the LED, discloses a leakage protection circuit comprising a power supply circuit, a step-down circuit, an LED circuit and a detection circuit. The input end of the power supply circuit is connected to the output pin of the power supply end, the output end of the power supply circuit is connected with the input end of the step-down circuit and the input end of the LED circuit, and the power supply circuit is used for rectifying the output power supply of the power supply end so as to output the power supply to the step-down circuit and the LED circuit; the output end of the step-down circuit is connected with the detection circuit, and the step-down circuit is used for carrying out step-down processing on the power supply output by the power circuit to output reference voltage to the detection circuit; and the detection circuit is respectively connected with the output pins of the power supply end and the LED circuit, and is used for controlling the working state of the LED circuit according to the real-time voltage difference and the real-time voltage between the output pins of the power supply end and the reference voltage output by the step-down circuit. According to the utility model, the working state of the LED circuit can be controlled according to the real-time voltage difference, the real-time voltage and the reference voltage, thereby realizing anti-creeping protection.

The invention belongs to the technical field of integrated circuits, and particularly relates to a dynamic comparator suitable for a low-voltage high-speed analog-to-digital converter, the dynamic comparator adopts a three-stage latch circuit structure to realize rapid comparison of weak input signals so as to generate corresponding digital signals, and the method specifically comprises the following steps of: in a pre-amplification stage, pre-amplification is carried out; the positive feedback effect of the cross-coupled transistor pair is utilized to efficiently convert a tiny input voltage difference (lt; 10mV) into a recognizable voltage difference, and then through two-stage regeneration of the main latch module and the auxiliary latch module, a logic level is quickly output to complete quantization judgment. The auxiliary latch stage is additionally arranged on the basis of a traditional cross coupling latch circuit, the working speed of the comparator is effectively increased under the condition that only small area overhead is introduced, and the probability that the dynamic comparator has a metastable state is greatly reduced.

The invention discloses a control device, a computer readable storage medium, a power converter and a self-checking method thereof, and relates to the technical field of power electronics. According to the power converter, before a controller controls a Boost circuit to operate, a bus voltage is controlled to rise to a preset value, so that the negative electrode of a fly-wheel diode in the Boost circuit is higher than the positive electrode by a larger voltage difference; then, detecting whether the difference between the bus voltage and the input end voltage of the Boost circuit is smaller than or equal to a preset bearing threshold value or not; if the difference between the bus voltage and the voltage of the input end of the Boost circuit is smaller than or equal to a preset bearing threshold value, it is indicated that the fly-wheel diode cannot bear a large voltage difference between the two sides of the fly-wheel diode in a normal reverse cut-off state, and then it can be determined that the fly-wheel diode in the Boost circuit has a short-circuit fault. The method belongs to a pure software scheme, does not need to increase hardware cost, and does not increase the layout difficulty of a PCB and the size of equipment.

The invention discloses a multi-path power source redundant power supply control method and system, and belongs to the technical field of power electronics, the system comprises a dynamic priority decision module, a zero-voltage-drop switching circuit and a fault safety framework, the dynamic priority decision module supports a user to customize a power source use priority rule through an MCU, and the zero-voltage-drop switching circuit is used for switching the zero-voltage-drop switching circuit to the fault safety framework. The MCU can autonomously carry out an automatic degradation and upgrading mechanism through voltage quality; according to the zero-voltage-drop switching circuit, when the MCU detects a fault of the main power supply, a target power supply pre-charging path is started, and when the target power supply is pre-charged until the voltage difference between the target power supply and the source voltage is smaller than or equal to 0.1 V, the target power supply GaNFET can be synchronously triggered to be switched on, and the pre-charging circuit and the original power supply GaNFET can be synchronously triggered to be switched off. The multi-path power supply input automatic switching circuit solves the problems of power-off risk, easy conduction loss and relatively high failure rate in the prior art, is suitable for a multi-path power supply input automatic switching system of a decoder and industrial control equipment, and is particularly suitable for a long-time uninterrupted power supply condition.

According to the buffer output control circuit, the buffer output control method and the LDO circuit applying the buffer output control circuit, the second control signal generation circuit and the second transistor are arranged, and in the dropout state, the second control signal generation circuit generates the high-level second control signal based on the error amplification signal to control the second transistor to be switched on; the potential of the control end of the power tube is pulled down to the ground, the problem of voltage loss on the control end of the power tube in the prior art is avoided, the power tube can be completely conducted in the state, the output voltage changes along with the input voltage, the voltage difference between the output voltage and the input voltage is small, and then the system loss can be reduced; and compared with the prior art, the power tube with a smaller area can be adopted to realize the same technical index. When the output voltage is in a voltage stabilization state, the second control signal generation circuit generates a low-level second control signal based on the error amplification signal to control the second transistor to be turned off, namely, in the state, the buffer output control circuit does not affect the work of the power tube.

The invention provides a transformer area latent fault identification method and system based on load data, and the method comprises the steps: employing a fault detection model, and based on the steady-state voltage difference, voltage instantaneous drop amplitude and load current in the load data of a transformer area, judging a suspected fault event in the transformer area; based on the load data of each suspected fault event, performing over-dead-zone voltage-current inverse correlation analysis and instantaneous down-frequency analysis on each suspected fault event in combination with a dynamic time warping algorithm, and determining a plurality of high-risk users corresponding to the high-risk event from the over-dead-zone voltage-current inverse correlation analysis and the instantaneous down-frequency analysis; according to the topological data of the transformer area, performing group anomaly traceability on high-risk users by using a graph neural network to determine a public fault point; resistance constant analysis is carried out on non-group high-risk users, user fault points are obtained, transformer area hidden dangers which are difficult to identify through traditional manual inspection can be effectively found, high-risk events can be accurately identified, public fault points can be deduced based on topology in combination with a graph neural network, and root cause analysis is achieved.

The invention discloses a low-noise, high-precision and low-power-consumption tunnel magnetoresistance array type magnetic anomaly detection device, and relates to the field of geomagnetic field magnetic anomaly detection. In order to overcome the defects that in the prior art, the detection precision is insufficient, the noise level is high, power consumption is large, and long-time stable operation is difficult to consider, the technical scheme provided by the invention is that a signal acquisition and amplification circuit is composed of a plurality of triaxial tunnel magnetoresistive sensors, an isolation circuit, an instrument amplification circuit and a passive filter circuit; the master control and signal processing circuit is composed of a high-precision analog-to-digital conversion circuit, a clock circuit and a microprocessor circuit. The signal transmission circuit is composed of an Ethernet module and is used for transmitting the processed data to an upper computer; the power supply module is composed of a low-noise low-dropout voltage stabilizing circuit and a reference voltage circuit, and is used for providing a stable power supply and a unified reference voltage. The method is suitable for long-time high-precision geomagnetic anomaly detection work in geophysical exploration, national defense safety monitoring and complex environments.

Load sharing techniques for voltage regulators. In an example, the techniques may be implemented in an LDO voltage regulator configured to provide load sharing with a single driver for internal and external pass elements using a pair of variable voltage dividers to adjust the load sharing based on load current. In other examples, a calibrated voltage source can be used to replace one of the variable voltage dividers. Calibration circuitry and methodologies for determining the value of the calibrated voltage source are also described. In still other examples, a single variable voltage divider can be used, with no calibrated voltage source, by constraining the external pass element to be weaker than the internal pass element. In any such examples, the internal and external pass elements can be implemented, for instance, with either n-type or p-type power transistors, and with similar transistor technologies or diverse transistor technologies (e.g., FETs and BJTs).

The invention discloses a control method and system for a comprehensive energy supply system of a double-source heat pump building, and relates to the technical field of heating, ventilation and air conditioning, and the control method comprises the following steps: collecting conductivity data, extracting a characteristic frequency component of the conductivity data, and judging the state of a phase change material through the characteristic frequency component; an adjusting instruction of the double-source heat pump is triggered according to the state of the phase change material, and a double-source heat pump energy supply mode is output; evaporation reference values are matched for different dual-source heat pump energy supply modes, the frequency of a compressor is adjusted according to the reference deviation, and a variable frequency driving signal is generated; dynamically adjusting compressor frequency and electronic expansion valve opening according to the variable frequency driving signal, monitoring inlet and outlet pressure difference of an evaporator after adjustment, and judging whether bypass valve shunting is carried out or not; a heat recovery channel is activated in bypass valve shunting, and energy recovery and energy supply regulation and control are completed. Through cooperation of conductivity characteristic frequency analysis and dynamic activation of the heat recovery channel, accurate judgment of the state of the phase change material and closed-loop regulation and control of energy flow are achieved.

The invention discloses a bypass inductor echelon current limiting topology and method for solid-state power distribution equipment, relates to the technical field of power electronic distribution, and is suitable for solid-state power controllers in the fields of aerospace, new energy automobiles and industrial automation. In order to solve the problems that when a large capacitive load is started, a current peak is likely to be generated to damage a device, and an existing current limiting scheme is low in efficiency or large in size, the topology comprises an input circuit, a main power circuit, an auxiliary circuit, a current limiting circuit, an absorption circuit and a load side circuit. According to the method, the auxiliary circuit switch tube is turned on in an echelon mode, and the main switch tube is turned on to complete starting after load voltage approaches power supply voltage and reaches a non-voltage-difference condition. According to the planar inductor integrated PCB, the size is reduced, the problem of long-term heating of a resistor is solved, the TVS overvoltage protection and RC anti-interference design are matched, the current peak is effectively restrained, the system efficiency and reliability are improved, and the high-power-density and differential-pressure-free starting requirements are met.

The invention belongs to the technical field of impact current suppression, and relates to a method and system for suppressing the impact current of a DC bus output by a DC charger, and the method comprises the following steps: collecting the output voltage of the DC bus and the required voltage of a vehicle side, and forming a voltage sequence; calculating the change rate and the pressure difference of the two; when the change rate exceeds a threshold value or the communication time sequence is discontinuous, entering voltage limiting constraint control; determining a limiting function according to the change rate and the voltage difference and updating a voltage reference value; adjusting the output voltage according to the updated reference value; and continuously executing voltage reference value updating and output adjustment until the output and the required voltage tend to be consistent, then exiting the voltage limiting constraint, and continuously performing dynamic adjustment according to the required voltage. According to the technical scheme, through dynamic monitoring and voltage difference constraint on the bus and the required voltage, voltage limiting adjustment and reference value smooth updating during sudden change are achieved, the impact current peak value is effectively restrained, and it is ensured that the voltage is stable, the current is limited, and the system operates stably.

The invention provides an active lightning triggering device and method for a fan blade. The device comprises two copper rods with tip heads, a protection circuit, a boost lightning circuit and a metal shielding net. The two copper rods are arranged in parallel at the blade tip of the fan blade, one copper rod is directly grounded, and the other copper rod is connected with the boost lightning circuit through the protection circuit; the boost lightning guide circuit comprises a charging capacitor, an inductor, a high-frequency switch and a diode and is used for sensing positive high voltage and dynamically adjusting resonance characteristics so as to enhance voltage difference between thundercloud and a copper rod and trigger uplink and downlink leader to form a discharge channel; the metal shielding net wraps the blade tip and is connected with the grounding device to ensure that lightning current is preferentially discharged through the copper rod, and the blade tip structure is prevented from being damaged. According to the method, environmental meteorology and blade attitudes are monitored in real time, a boosted circuit is started in combination with threshold judgment, and control parameters are optimized by using a remote monitoring platform, so that intelligent lightning protection management is realized. According to the device, by actively exciting corona discharge and accurately guiding a lightning path, the lightning protection efficiency of the blade is remarkably improved, the damage risk of a non-lightning-receiving area is reduced, meanwhile, a maintenance decision is supported through datamation operation and maintenance, and the device is suitable for wind generating set protection in a thunderstorm area.

The present invention provides an elevator energy-saving apparatus, connected in parallel to an elevator variable-frequency drive bus, and comprising: a battery pack, a battery management system (BMS), a power control system, a DC-DC direct current power supply, and a PLC controller, wherein the DC-DC direct current power supply is connected to the BMS and is connected in parallel to the elevator variable-frequency drive bus; the PLC controller is connected to the DC-DC direct current power supply; under the action of the PLC controller, the DC-DC direct current power supply changes a voltage inputted from the battery pack to a second preset voltage, so as to control the voltage of a high-voltage end to be at the second preset voltage; and under the action of a high and low voltage difference, when an elevator generates electricity, the voltage on the elevator variable-frequency drive bus does not rise to a first preset voltage, and a current automatically flows to the elevator energy-saving apparatus. The present invention has the characteristics of energy saving and high efficiency, reducing operating costs, stable operation, reducing the pressure of a power grid, and prolonging the service life of a device.

The invention provides a differential pressure detection device and a method for determining the degradation condition of an insulator string. The device comprises a detection circuit and a first resistor, and the voltage difference detection device is used for detecting the voltage difference between the input end and the output end of a corresponding insulator. The detection circuit is connected with the first resistor in series, the detection circuit comprises a first breakdown unit, a second breakdown unit, a second resistor and a current detection unit, and the resistance value of the second resistor is smaller than that of the first resistor; the first voltage stabilizing unit, the second voltage stabilizing unit and the second resistor are connected in parallel; the current detection unit is used for detecting current flowing through the second resistor. Through the voltage difference detection device, the voltage difference condition of the insulator string can be determined, the degradation condition of the insulator string is evaluated according to the voltage difference condition, and the processing efficiency is improved.

The invention provides an inductive current anti-backflow device for a switching power supply, a converter and the switching power supply. The inductive current anti-backflow device comprises a first asynchronous judgment module which is configured to determine and generate a first asynchronous judgment signal according to a minimum current comparison signal in the switching power supply, the lower tube conduction indication signal and the upper tube control signal, the magnitude of the minimum current comparison signal and the lower tube conduction indication signal is used for reflecting whether the input voltage and the output voltage are close or not; the second asynchronous judgment module is configured to determine and generate a second asynchronous judgment signal according to the upper tube conduction indication signal, the minimum current comparison signal and the first asynchronous judgment signal; and the logic processing module is configured to determine and generate the lower tube control signal according to the second asynchronous judgment signal and the upper and lower tube on-off indication signal. The problem that the inductive current flows backward when the input and output voltage difference of the system is low can be effectively prevented.

This application provides a surge-protected bandgap reference source circuit and electronic device. The circuit comprises a startup circuit, a control circuit, and a shunt circuit, with the first terminals connected to a power supply. The second terminal of the startup circuit is connected to the control circuit. The control circuit is connected to the second terminal of the startup circuit. The second terminal of the shunt circuit is connected to both the startup circuit and the control circuit. The third terminal of the shunt circuit is connected to the electronic device and ground. When a power surge occurs, the power supply provides a first electrical signal to the startup circuit, which then conducts under the influence of the first signal. The second terminal of the startup circuit provides a second electrical signal to the control circuit. The power supply provides a third electrical signal to the first terminal of the control circuit. Under the influence of the second and third electrical signals, the voltage difference in the control circuit increases, and a fourth electrical signal is provided to the second terminal of the shunt circuit, causing the shunt circuit to conduct. This dissipates some current through the ground wire, reducing the current to the electronic device and effectively protecting the electronic device connected to the bandgap reference source circuit.

The invention relates to the technical field of semiconductor precision machining, in particular to a precision temperature control system with a high-precision pressure stabilizing function, which comprises a circulating fluid system, the circulating fluid system comprises a liquid inlet pipeline connected with heat exchanger circulating fluid, a water tank is mounted at the tail end of a liquid outlet pipeline of a heat exchanger, and a water pump is arranged at the top of the water tank. The output end of the water pump is connected with a liquid outlet pipeline, and a third filter, a surge tank and a fourth pressure sensor are sequentially arranged on the liquid outlet pipeline in the fluid conveying direction. The pressure stabilizing tank is additionally arranged between the third filter and the fourth pressure sensor, the pressure stabilizing tank can effectively absorb pressure loss caused by the fact that fluid passes through the third filter, the system pressure fluctuation range is reduced to + / -20 mbar from original + / -30 mbar to + / -50 mbar, the pressure stability and control precision of system operation are remarkably improved, and the system pressure fluctuation range is reduced to + / -20 mbar from original + / -30 mbar to + / -50 mbar. The operation pressure of the circulating liquid outlet of the Chiller equipment is stabilized, and the pressure difference fluctuation of the circulating liquid is obviously reduced.

The invention relates to the technical field of intelligent glasses, and provides an intelligent glasses PAD point resistance value measurement system, which comprises a nose support pin CON4, a glasses leg pin CON8, a constant current power supply circuit, a voltage difference measurement circuit, a power supply module and a control module, and is characterized in that the constant current power supply circuit is electrically connected with a glasses leg of the intelligent glasses through the glasses leg pin CON8, and is used for providing a test current flowing through a PAD; the voltage difference measuring circuit is electrically connected with a nose support and glasses legs of the intelligent glasses through a nose support pin CON4 and a glasses leg pin CON8 and used for collecting the voltage difference between the positive electrode of the glasses leg and the positive electrode of the nose support and the voltage difference between the negative electrode of the nose support and the negative electrode of the glasses leg and sending the voltage differences to the control module, and the control module calculates the PAD point resistance value according to the two voltage differences. The power module is used for supplying power to the resistance measuring system. According to the technical scheme, two voltage differences are obtained, so that the total resistance value of the PAD point is calculated, and high-precision and anti-interference resistance value measurement of the PAD point is realized through four-wire method resistance measurement and double-voltage-difference acquisition.

The application discloses a voltage detection circuit for high-side NMOS driving; the detection circuit can be applied to a driving circuit system realized by using a pump circuit mode; the system comprises a high-side driving, a pump circuit, a voltage detection circuit and a power tube NM1_H; the high-side driving is electrically connected with the pump circuit, the pump circuit is electrically connected with the power tube NM1_H, the input end of the voltage detection circuit is electrically connected with the gate and the source of the power tube NM1_H respectively, and the output end of the voltage detection circuit is electrically connected with the pump circuit; the voltage detection circuit comprises a high-voltage tube PM1, a high-voltage tube PM2, a high-voltage tube NM3, a high-voltage tube NM4, a bias current I1, a bias current I2, a bias current I3, a voltage stabilizing diode Z1 and an inverter INV1; the application uses the reverse breakdown voltage of the voltage stabilizing diode as a judgment threshold value, detects the voltage difference between two input signals, realizes the protection of the high-side power tube, has few devices, is low in cost and has very low power consumption.

The invention discloses an electronic wire harness health management method and device, and relates to the field of fault prediction and health management. The method comprises the following steps: acquiring electrical parameter data of a plurality of sampling points of the electronic wire harness within a first time length, and generating a first data set; based on the first data set, current change conditions and voltage change conditions of the front end and the rear end of the electronic wire harness are determined, and current difference information and voltage difference information are obtained respectively; judging whether the current state of the electronic wire harness is normal or not based on the current difference information to obtain a first judgment result; when the first judgment result represents normal, judging whether the loop resistance fluctuation of the electronic wire harness is normal or not based on the voltage difference information, the input current and the output current, and obtaining a second judgment result; and determining whether the health state of the electronic wire harness is abnormal or not based on the second judgment result. According to the scheme provided by the embodiment of the invention, the accuracy and reliability of a health evaluation result can be improved while online detection is realized.

This application belongs to the field of power electronics and automatic control technology, and relates to a power supply smooth switching control method for suppressing DC bus voltage surges. It solves the problem of DC bus voltage surges caused by potential changes during primary / standby power supply switching, including: dynamically matching the standby power supply output to the primary power supply voltage and reserving a voltage difference margin through voltage closed-loop feedback; initiating switching when a primary power supply fault is detected or the bus voltage drop rate exceeds a threshold; utilizing controlled current injection into the MOSFET gate to bring it into the Miller plateau region and allowing it to remain in the linear operating region for a preset transition period; controlling the MOSFET drain-source equivalent resistance to continuously decrease according to an S-shaped function to absorb transient energy; and locking the fully conducting state to complete seamless switching when the drain-source voltage difference approaches zero. This method effectively eliminates high-frequency oscillations, achieves microsecond-level potential transitions, significantly improves system reliability and response speed, and is suitable for high-reliability power supply scenarios with stringent "zero-inductive switching" requirements.

The invention relates to a low-offset low-leakage sampling holding circuit and a control method, the low-offset low-leakage sampling holding circuit comprises a common-mode voltage generation circuit, a pre-sampling holding control circuit and an output-stage sampling holding circuit, the common-mode voltage generation circuit generates common-mode voltage VCM with driving capability for the pre-sampling holding control circuit; then the pre-sampling holding control circuit is combined with the common-mode voltage VCM, input voltage information and offset voltage information are sampled according to the input voltage VIN, the offset voltage information is counteracted in the pre-holding stage, the precision of the sampling information is improved, voltage information VOUT is output, and finally the output-stage sampling holding circuit processes the voltage information VOUT, so that the output-stage sampling holding control circuit outputs the output voltage VIN. The target voltage information VSAMPLE meeting the long-time storage requirement of the signal is output; according to the invention, the pre-sampling holding control circuit is designed, switches are reasonably switched to reduce imbalance, and the voltage difference between each stage of a switching tube in the output stage sampling holding circuit is reduced, so that electric leakage is reduced, and the storage time of input voltage information is prolonged.

The invention belongs to but not limited to the technical field of aviation power supply system control, protection and fault monitoring, and particularly relates to a three-phase AC voltage imbalance detection and alarm circuit. Comprising a three-phase AC voltage sampling module used for collecting a three-phase AC input voltage and outputting a three-phase AC voltage effective value; the voltage difference detection module is used for detecting the difference value of any two-phase alternating-current voltage and outputting the absolute value of the difference value of the effective values of any two-phase alternating-current voltage; the hysteresis comparison module is used for judging whether the absolute value of the difference value of the effective values of the AC voltages of any two phases exceeds a three-phase voltage imbalance judgment threshold value or not, and outputting an imbalance state signal of any two phases; the logic judgment module is used for carrying out logic OR operation on any two-phase unbalanced state signals of the three phases and outputting three-phase voltage unbalanced state signals after fixed time delay; and the alarm output driving module is used for performing power amplification on the three-phase voltage imbalance state signal and then driving an external three-phase voltage imbalance fault indicating lamp.

The application provides a transient response method, circuit and device based on a dual-path power converter, and relates to the technical field of circuit electronics. The transient response method based on the dual-path power converter comprises the following steps: if a voltage mutation signal of a voltage input end in the dual-path power converter is detected, the mutation type of the voltage mutation signal is determined according to the voltage mutation signal; then, the on-off state of a first switching unit, a second switching unit and a third switching unit is controlled according to the mutation type, so that the dual-path power converter enters a mutation working mode; if the voltage difference between two ends of a first flying capacitor in the dual-path power converter and the voltage difference between the voltage input end and a voltage output end satisfy a preset balance condition, the on-off state of the first switching unit, the second switching unit and the third switching unit is controlled, so that the dual-path power converter enters a steady-state working mode.

The utility model provides a power supply device and a power utilization device. The power supply device comprises a power battery, a direct current conversion module, a high-voltage load and a low-voltage load, the direct current conversion module is used for converting the direct current provided by the power battery and providing the converted direct current for the high-voltage load and the low-voltage load; wherein the direct current conversion module comprises a primary side circuit, a first secondary side circuit and a second secondary side circuit; the primary side circuit is connected with a power battery, and the first secondary side circuit is connected with a low-voltage load and is used for charging the low-voltage load; and the second secondary side circuit is connected with the high-voltage load and is used for pre-charging the high-voltage load. Specifically, according to the design of the power supply device provided by the invention, the pre-charging of the high-voltage load can be realized, so that the impact current when the main positive electrode switch and the main negative electrode switch are switched on with voltage difference is reduced, and the temporary charging of the low-voltage load can be realized, so that the generation of faults when the power supply of a low-voltage loop is abnormal is reduced.