3497 results about "Dc source" patented technology

The invention discloses a storage battery capacity checking method for a parallel intelligent direct-current power supply system, and relates to the technical field of storage battery capacity checking, which comprises the following steps of: respectively deploying electromagnetic sensing modules with nanosecond-level response capability at a master control end and a slave node end of a communication bus, acquiring voltage disturbance waveform signals of the communication bus in an operation process, and performing feature extraction operation on the transient high-frequency interference pulse detected each time, and constructing a multi-dimensional feature sequence of the high-energy transient electromagnetic interference. By deploying the high-response electromagnetic sensing module and combining an active suppression mechanism of interference feature extraction and risk index driving, time alignment modeling and self-adaptive regulation and control of electromagnetic interference and communication performance are realized, the communication stability, the battery state recognition accuracy and the capacity accounting continuity of the system in a strong interference environment are effectively improved, and the system reliability is improved. And the anti-interference capability and the operation safety of the parallel direct-current power supply system are obviously enhanced.

The invention relates to a PFC-PWM (Pulse Width Modulation) dual-mode control method for a high-voltage direct-current power supply with a wide output voltage range. The output current of the high-voltage direct-current power supply is detected in real time, the critical threshold value of the load impedance is mapped into the hysteresis interval of the output current, the theoretical boundary of mode switching is obtained, and the control mode is dynamically adjusted. In order to further guarantee smooth switching of the two control modes, hysteresis control logic is designed, and undisturbed smooth switching of the PFM mode and the PWM mode is achieved. Based on an energy equivalence principle and a frequency consistency constraint of a critical load SWL working point, a current threshold criterion and a parameter pre-synchronization strategy are constructed, seamless connection of a mode switching process in a frequency domain and an energy domain is ensured, a transient oscillation risk is remarkably reduced, and a guarantee is provided for continuous and stable output of a full-range load working condition.

A multi-phase LLC resonant converter circuit (10) includes: first to third LLC resonant converters each including a series circuit (S1 to S3) of a first switch and a second switch that are connected in parallel to a DC power supply, a high-frequency transformer (T1 to T3) including a primary-side winding and a secondary-side winding, a resonant circuit including a resonant reactor (Lr1 to Lr3) connected between a connection point of the first switch and the second switch and one end of the primary-side winding, a resonant capacitor (Cr1 to Cr3) in which one end is connected to the other end of the primary-side winding, and a divided resonant capacitor (Cn1 to Cn3) in which one end is connected to a connection point of the primary-side winding and the resonant capacitor; a first neutral line (N1) that connects the other end of the resonant capacitor; a neutral line reactor (Ln) connected between the first neutral line and a power supply line of the DC power supply; and a second neutral line (N2) that connects the other end of the divided resonant capacitor.

Provided is a downhole device, a well system, and a method. The downhole device, in one aspect, includes an electromagnetic assembly, as well as a magnetic target positioned proximate the electromagnetic assembly, wherein one of the magnetic target or the electromagnetic assembly is coupled with a movable feature of the downhole device, the movable feature configured to move to physically couple or physically decouple the electromagnetic assembly and the magnetic target. The downhole device, according to this aspect, further includes a sensor electrically coupled to the electromagnetic assembly, the sensor configured to sense for a change in a DC power parameter powering the electromagnetic assembly as the electromagnetic assembly and magnetic target physically couple to or physically decouple from one another, the sensed change representative of a change of impedance within a coil of the electromagnetic assembly and employable to estimate the status or health of the downhole device.

The invention relates to the technical field of direct-current power supply fault diagnosis, in particular to a fault self-diagnosis modular direct-current power supply system, which is characterized in that a failure mechanism dynamic modeling unit constructs a multi-stress coupling degradation mapping library, adopts a degradation mechanism decoupling algorithm to separate and superpose failure effects and generates a dynamic degradation model; the early degradation capture unit deploys a high-frequency wide-domain sampling circuit and a noise suppression signal chain, combines time-frequency domain joint feature extraction and separates degradation feature signals from background noise, and the self-adaptive life prediction unit adopts a long short-term memory network and random forest fusion algorithm to dynamically correct parameters and output residual life probability distribution. The intelligent fault judgment unit realizes progressive diagnosis through a hierarchical threshold decision mechanism, and the health management cooperative execution unit triggers a pre-maintenance strategy, executes power flexible derating, redundancy switching or directional fusing isolation, and improves the reliability of the system.

The invention discloses an output voltage detection method and system based on an aviation power supply, and relates to the technical field of aviation power supply voltage detection. A differential voltage sensor is connected to the output end of an aviation power supply, a high-frequency suppression capacitor is connected in parallel, the sampling rate of 20-50 times of the working frequency is set according to the type of the power supply, and the signals are collected and converted into analog voltage signals; the analog signal is subjected to two-stage filtering, is amplified to 0-5V through an instrument amplifier, and is converted into a digital voltage sequence through a 16-bit ADC (Analog to Digital Converter); calculating AC power supply effective value, peak value and other parameters, DC power supply average value, ripple coefficient and other parameters; comparing the characteristic parameters with a preset threshold value, determining that the characteristic parameters exceed the threshold value and recording related information; and a detection result is transmitted to a monitoring terminal through an RS485, data is locally stored, and a switching value is output to an alarm device when the data is abnormal. The method adapts to aviation power supply load fluctuation and environment temperature change, detection precision is high, data transmission and storage are safe, abnormity is accurately identified and early warning is carried out in advance, and aviation power supply operation and maintenance reliability and efficiency are improved.

An electrical transmission safety system for connection of direct current (DC) power from a DC power source to a load comprises: a connection from the power source to the load, the connection comprising a positive terminal and a negative terminal; a first solid state switch electrically connected between the power source and one of the positive terminal and negative terminal; and a switch-control isolation block comprising a first optocoupler, the first optocoupler providing electrical isolation from the power source for generating a first isolated switch-control signal in response to a switch-control input signal, the switch-control isolation block connected to provide the first isolated switch-control signal to the first solid state switch to thereby control an ON or OFF conduction state of the first solid state switch and corresponding current flow between the power source and the load through the one of the positive terminal and negative terminal.

The invention relates to the technical field of radio frequency power matching, and discloses a direct-current radio frequency hybrid high-power network matching optimization method. The method comprises the following steps: collecting current fluctuation data of a direct-current power supply module and power reflection data of a radio-frequency emission module, and generating a hybrid network impedance characteristic set; calling a power grid topology analysis engine to analyze the set to obtain an impedance track characteristic matrix; performing dynamic trajectory optimization on the matrix based on a preset frequency domain stability constraint rule to generate corrected impedance trajectory distribution; fusing the corrected track distribution and the radio frequency load dynamic response data, and constructing multi-band matching topological feature representation; performing parameter decoupling on the topological feature representation through a nonlinear matching mapping engine to generate an optimal matching parameter configuration table; and finally adjusting the voltage stabilization coefficient of the DC power supply module and the tuning capacitance value of the radio frequency emission module according to the configuration table. According to the method, efficient matching optimization of the hybrid network is realized, and the stability and adaptability of system operation are improved.

The utility model relates to the technical field of energy storage power supplies, and mainly provides a direct-current power supply fault latch circuit and an energy storage system, the circuit comprises a switch module connected with a battery and a direct-current power supply, a latch module connected with the switch module, and a sampling resistor connected with the latch module, and the sampling resistor is also connected with the negative electrode of the battery and the negative electrode of the direct-current power supply. The switch module is also used for receiving the driving signal. The sampling resistor outputs a sampling voltage to the latch module according to the output current of the cathode of the DC power supply. The latch module is used for controlling the switch module to start working according to the driving signal when the sampling voltage is smaller than the preset voltage so as to output the power supply voltage of the battery to the direct-current power supply; and when the sampling voltage is greater than the preset voltage, it is considered that an overcurrent short circuit fault occurs, and at the moment, a turn-off signal is continuously output to the switch module to close the switch module and lock the closed state, so that output of the power supply voltage is stopped, and the service life of the energy storage system is prolonged while the energy storage system is protected.

The invention discloses a POL power supply automatic test method based on modular design, and belongs to the technical field of power supply test. The method comprises the following steps: firstly, under the control of an upper computer, automatically reading POL power supply basic parameters including key characteristic parameters such as input / output voltage, rated current and frequency from a preset Excel table, and establishing a judgment reference for testing; then, instrument initialization is completed, communication connection with test equipment such as an oscilloscope, an electronic load and a direct-current power supply is established, and configuration of initialization function parameters is completed; then, executing a measurement task of each core parameter of the POL power supply to be tested, and in the test process, executing a parallel measurement management mechanism, namely configuring each instrument parameter and channel state in real time according to a specific test item, and triggering a retry or interrupt logic under the conditions of communication abnormality, data timeout and the like until the test recovers a running state; and finally, after the test is completed, performing Excel storage and interaction on the standardized test data and the waveform screenshot, and finally safely exiting. According to the POL power supply automatic test method based on the modular design, the whole test process is divided into a plurality of serial or parallel function processing units such as parameter reading, instrument initialization, test execution and test management, data storage and interaction and the like, and high efficiency and usability of a test system are achieved.

The utility model relates to a rear-phase-cut single-live-wire type wall light modulator, which comprises an MOS (Metal Oxide Semiconductor) tube switch loop unit, a singlechip control unit and a direct-current power supply unit, the MOS tube switch loop unit comprises a wiring terminal J2 connected with an MOS tube Q1, a grid electrode of the MOS tube Q1 is connected with four resistors in series in sequence and then is connected with an MOS tube Q2, a drain electrode of the MOS tube Q2 is connected with a diode D2, the diode D2 is connected with a diode D1, a fixed end contact of a single-pole double-throw switch is connected with the MOS tube Q2, and two movable end contacts of the single-pole double-throw switch are connected with the wiring terminal J1 and the wiring terminal J3 respectively; the direct-current power supply unit comprises an alternating-current voltage waveform acquisition circuit, a direct-current voltage drop circuit, an overcurrent protection circuit and a filtering voltage stabilizing circuit; according to the single-chip microcomputer control unit, a linear sliding potentiometer is connected with the PC2 end of a single-chip microcomputer after being connected with a resistor in series, the linear sliding potentiometer and a rotary potentiometer are sequentially connected between the output end of the direct-current power supply unit and the ground in series, a triode Q6 is connected with a triode Q5 and then connected with the collector electrode of a triode Q7, and the base electrode of the triode Q7 is connected with the PA6 end of the single-chip microcomputer after being connected with a resistor in series.

The invention provides an energy storage and discharge circuit, and relates to the technical field of energy storage and discharge, and the circuit comprises a power supply input interface, a first current limiting assembly, a first switching device, a first electric control device, a start-stop control transmission device, and an energy storage assembly. The start-stop control transmission device is connected with the control end of the first switching device; a first port of the first switching device is externally connected with a direct-current power supply, and an output end is connected with a control system of the first electric control device; the power supply input interface is connected with an input end of the first current limiting assembly, an output end of the first current limiting assembly is connected with a first port of a controlled system of the first electric control device, and a second port of the controlled system of the first electric control device is connected with a port of the energy storage assembly; according to the invention, the sudden change of the voltage at the two ends of the capacitor when the capacitor is directly subjected to energy storage in the energy storage discharge circuit can be avoided, the capacitor is prevented from being damaged, and the reliability of the energy storage discharge circuit is improved.

The invention relates to the technical field of electronic measurement, in particular to a multifunctional comprehensive test method and system for a direct-current power supply, and the method comprises the steps: initializing a test; a static performance test step; a dynamic performance test step: driving a direct-current electronic load module to execute a time sequence instruction sequence in the dynamic load test file, and acquiring an output voltage and an output current waveform through a high-speed data acquisition module in the execution process; a ripple noise test step: switching the high-speed data acquisition module to an alternating current coupling mode and acquiring a high-frequency noise waveform in a constant load current section in the time sequence instruction sequence; a correlation analysis step; and a test termination step: controlling the load to return to zero and closing the tested DC power supply. Through automatic configuration and test execution of the system, the complexity of manual operation is reduced, and the test efficiency is improved. And especially in a high-frequency test scene, the test time is remarkably saved through automatic execution.

The invention discloses a control circuit and method for a three-phase wireless power transmission system to supply power to a single-phase load. The method comprises the following steps: setting the frequency, amplitude and electrical angle of a three-phase voltage; determining the input voltage of the direct-current power supply; a proportional resonance (PR) controller is used for processing input voltage of a direct-current power supply and three-phase instantaneous voltage input by a transmitting and receiving coil module, and control signals are obtained after processing; inputting the control signal into a three-phase high-frequency inverter and a modulation circuit module to generate a square wave signal conforming to a set three-phase voltage phase; inputting the square wave signal into a resonance compensation module to generate a three-phase sinusoidal voltage wave which is the same as the set three-phase voltage; the three-phase sinusoidal voltage wave is subjected to wireless electric energy transmission through the transmitting and receiving coil module to obtain a corresponding square wave signal; corresponding square wave signals are converted into sinusoidal voltage waves through the rectifying and filtering module and are transmitted to a system load. According to the invention, the transmission power of the three-phase wireless power transmission system can be improved.

The invention relates to the technical field of high-voltage electric appliance detection, in particular to a device and method for detecting the vacuum degree of a vacuum arc-extinguishing chamber, and the method comprises the steps: arranging a field emission cathode on one metal end cover of the vacuum arc-extinguishing chamber; an anode is arranged on the metal shielding cover close to the field emission cathode in the vacuum arc-extinguishing chamber; the high-voltage direct-current power supply is connected to the field emission cathode and the anode and is used for applying voltage to the electrodes so as to drive the field emission cathode to emit electron beams to impact the anode; the X-ray energy spectrum detector directly faces the anode, the X-ray energy spectrum detector is used for measuring bremsstrahlung X-ray energy spectrum generated when the electron beam impacts the anode, an electron emission source is actively arranged in the arc extinguish chamber, and the distribution of the X-ray energy spectrum generated by the electron emission source is measured. And high signal-to-noise ratio, high-precision and high-sensitivity vacuum degree quantitative detection is realized by utilizing the strong correlation between the energy spectrum form and the internal gas pressure.

The utility model belongs to the technical field of new energy automobiles, and particularly discloses a new energy automobile high-pressure liquid heater which comprises a heater body, a thick film heating plate, a heat insulation plate, a cover plate and an overheating protection circuit which are sequentially installed from bottom to top. The overheating protection circuit comprises four thermistors Rt1, Rt2, Rt3 and Rt4, an N-type MOS tube, a relay KJ, a heating resistance wire Rh, a resistor R1, a resistor R2, a resistor R3, a low-voltage direct-current power supply and a high-voltage direct-current power supply. According to the thick film heating plate, the water-drop-shaped turbulent flow columns and the turbulent flow teeth are arranged, so that the heat conduction efficiency and the heat exchange efficiency of the thick film heating plate in liquid are improved, and better convective heat exchange is realized; and the overheating protection circuit is arranged, so that the reliability of the heater during over-temperature protection is improved, and the heater is not only controlled by software.

The invention relates to a cascaded modularized direct-current power supply and a dynamic redundancy control method thereof, and belongs to the technical field of power electronics and direct-current power supply. The method comprises the following steps: firstly, activating a redundancy-main component collaborative initialization mechanism, dynamically matching a capacitor voltage of a main component by using a built-in pre-charging structure of a redundancy component, and meanwhile, loading a redundancy state pre-sensing mechanism to establish a parameter correlation model; key state parameters of a main assembly are collected based on a dynamic parameter real-time sensing mechanism, and abnormal grading judgment and switching instruction generation are achieved through a grading redundancy triggering mechanism; starting a real-time redundancy scheduling mechanism, controlling soft turn-off of an abnormal main component and zero current access of a redundant component, and accurately filling a power gap in combination with a dynamic power matching compensation mechanism; and a collaborative recovery process is activated by a redundant state real-time monitoring mechanism, so that stable access of the main component and standby recovery of the redundant component are realized. Through full-process dynamic redundancy control, the power supply reliability of the cascade link under different working conditions is effectively guaranteed.

A fault detection system for detecting a fault condition in a direct current (DC) system. The system may include a transmitter including a DC source to energize a cable and a receiver connected to the cable and including a signal generator to generate a periodic signal. The transmitter may include a termination impedance matched to the characteristic impedance of the cable to absorb substantially all the periodic signal. The transmitter may include a fault detection circuit coupled to the cable to detect changes in the frequency response of the cable by tracking changes in the envelope of the power of the periodic signal and outputting a fault signal if the rate-of-change of the envelope of the power of the period signal exceeds a threshold level.

The invention provides a target poisoning resisting method and system based on multi-stage pulse reactive sputtering, and belongs to the technical field of magnetron sputtering. According to the method, air serves as reaction gas, a pulse direct-current power source is adopted, and reactive sputtering treatment is conducted on a metal target material; the reactive sputtering treatment comprises a first stage, a second stage and a sputtering voltage feedback control stage in sequence. The sputtering power and the duty ratio are adjusted in three stages, the first stage can stabilize luminance build-up and preliminarily clean the surface of the target material, and the second stage can improve the nitrogen ionization rate (gt; 50%) and suppresses the oxygen ionization rate (lt; and in the sputtering voltage feedback control stage, the sputtering power and the duty ratio are adjusted according to the drop amplitude of the sputtering voltage, an insulating compound layer on the surface of the target material can be efficiently sputtered and stripped, and the poisoning state of the target material is effectively inhibited, so that the method can effectively inhibit target material poisoning, the service life of the target material is prolonged, complex equipment is not needed, and the cost is relatively low.

The invention discloses a carbon felt electrode for a zinc-bromine flow battery as well as a preparation method and application, and belongs to the technical field of zinc-bromine flow battery production, the method comprises the following steps: immersing a carbon felt into an acid solution for chemical etching, etching uniform grooves in the carbon fiber surface of the carbon felt, cleaning and drying to obtain a pretreated carbon felt; the preparation method comprises the following steps: dissolving tin salt and nickel salt in deionized water, and adding a hydrolysis inhibitor to obtain a precursor solution; and immersing the pretreated carbon felt into the precursor solution, carrying out electro-deposition under constant current by adopting a direct-current power supply by taking the re-selected untreated carbon felt as a counter electrode, washing the pretreated carbon felt subjected to electro-deposition with water, and drying for the second time to obtain the carbon felt electrode for the zinc-bromine flow battery. By utilizing the zinc affinity of Sn and Ni, zinc is preferentially deposited on Sn and Ni sites of the carbon felt electrode, the deposition depth is obviously enlarged, the zinc deposition space is optimized, the zinc deposition area capacity is effectively improved, and the problem that the surface capacity of the carbon felt electrode is limited is solved.

The invention discloses a device and a method for testing the service life of a welding spot under a thermal-electric-vibration coupling load. The device comprises a thermal cycle device, a vibration device, a computer, a data acquisition instrument and a direct-current power supply. The thermal circulation device is fixed above a vibration table of the vibration device, threaded holes are formed in the vibration table, a circuit board can be fixed on the vibration table through screws, and thermal vibration coupling loading is achieved; a stable power supply is provided for welding spots on a circuit board through a direct-current power supply, so that heat-electricity-vibration coupling loading is realized; the welding spots are connected through the daisy chain, the resistance value of the welding spots is obtained through the data acquisition instrument, the computer is used for monitoring the resistance value, and an alarm value can be set, so that the service life of the welding spots is tested.

The invention discloses an industrial personal computer UPS power supply method based on commercial power interruption seamless switching, and relates to the field of uninterruptible power supply control, and the method comprises the steps: configuring a UPS input unit to receive a DC power supply converted from commercial power, charging a lithium battery pack through a BQ24610 charging management chip, collecting a current detection signal of the BQ24610 charging management chip through an MCU, obtaining the electric quantity state of a lithium battery, and outputting the electric quantity state of the lithium battery. An LM5176 buck-boost controller is arranged to be synchronously connected with the input unit and the lithium battery pack to form a bidirectional energy path; the voltage of the UPS input unit is monitored through the MCU, and a switching instruction is triggered. According to the invention, the MCU controls the EN pin of the LM5176 buck-boost controller and the CE pin of the BQ24610 to cooperatively switch a power supply path, millisecond-level seamless switching of a hardware level is realized, and meanwhile, an RS232 bus is matched to transmit a state signal in real time, so that the data protection process of the industrial personal computer and the power supply switching action are precisely synchronized, and the reliability of the industrial personal computer is improved. The problem that hardware switching and software protection are not synchronized in a traditional scheme is solved.

A kitchen appliance is disclosed includes a first electrical component, a second electrical component, and a wireless power receiver system. The wireless power receiver system includes a first receiver antenna configured to couple with a first transmission antenna and receive virtual AC power signals from the first transmission antenna. A second receiver antenna is configured to couple with a second transmission antenna and receive virtual DC power signals from the second transmitter antenna. A first receiver power conditioning system is configured to receive the virtual AC power signals, convert the virtual AC power signals to AC received power signals, and provide the AC received power signals to power the first electrical component. The second receiver power conditioning system configured to receive the virtual DC power signals, convert the virtual DC power signals to DC received power signals, and provide the DC received power signals to power the second electrical component.

A distributed power system including multiple (DC) batteries each DC battery with positive and negative poles. Multiple power converters are coupled respectively to the DC batteries. Each power converter includes a first terminal, a second terminal, a third terminal and a fourth terminal. The first terminal is adapted for coupling to the positive pole. The second terminal is adapted for coupling to the negative pole. The power converter includes: (i) a control loop adapted for setting the voltage between or current through the first and second terminals, and (ii) a power conversion portion adapted to selectively either: convert power from said first and second terminals to said third and fourth terminals to discharge the battery connected thereto, or to convert power from the third and fourth terminals to the first and second terminals to charge the battery connected thereto. Each of the power converters is adapted for serial connection to at least one other power converter by connecting respectively the third and fourth terminals, thereby forming a serial string. A power controller is adapted for coupling to the serial string. The power controller includes a control part adapted to maintain current through or voltage across the serial string at a predetermined value.

The application relates to a power system for an explosion-proof carrier, and belongs to the field of power system design. The system comprises a central control explosion-proof box, a battery heating module, a DC 220V direct current power supply, an explosion-proof battery pack, an explosion-proof motor driver, an explosion-proof display and a charger. The application effectively solves the problems of low-temperature charging difficulty, short endurance time, poor battery pack data acquisition and equalization management effect and improper control strategy of the existing carrier, and realizes advanced reliability, controllable risk and long service life.

A micro inverter and a modulation method thereof are provided in the present disclosure. The micro inverter includes a filter, a transformer, and a switching circuit. The switching circuit includes one or more first switching circuit and one second switching circuit. Each of the first switching circuits has an input terminal serving as an output terminal of a direct-current power supply, and is configured to convert a direct current into an alternating current and output the alternating current to the second switching circuit. An output terminal of the second switching circuit is connected to a primary side of the transformer. A secondary side of the transformer is connected to an input terminal of the filter.

The invention discloses a multi-port DAB energy storage system directly connected with an elevator frequency converter bus and a cooperative control method of the multi-port DAB energy storage system, and is suitable for an elevator frequency converter direct-current bus direct-connection scene. Aiming at the defects in the aspects of elevator bus transient support, multi-branch extension and parallel operation safety access in the prior art, at least two DAB power branches are adopted, the low-voltage sides of the DAB power branches are connected into the same low-voltage direct-current source in parallel to realize current expansion, and the high-voltage sides of the DAB power branches are connected to a VFD direct-current bus through a parallel operation access switch to realize voltage expansion after being connected in series and laminated; the controller adopts fixed frequency phase shift control, and combines a two-line parallel operation or power-off time sequence and a zero-crossing residence strategy; through multi-branch phase interleaving, mutual exclusion amplitude limiting constraint, ZVS guarantee and a fault striding linkage mechanism, branch power balance, circulating current suppression and bus stable support are realized. According to the invention, the millisecond voltage of the bus can be efficiently suppressed, the response speed, the operation efficiency and the reliability of the system are improved, and the core requirements of elevator bus energy recovery and transient stability control are met.

The invention belongs to the technical field of power electronics, and provides a portable IGBT power assembly detection device and method, and the device comprises a portable box body, and an adjustable DC power supply, a main control unit, a drive switching unit and an upper computer which are disposed in the portable box body. The adjustable direct-current power supply is used for supplying power to the tested IGBT power assembly; the main control unit is used for generating and sending a PWM driving signal to a tested IGBT power assembly, and obtaining key electrical parameters and temperature data of the tested IGBT power assembly through driving the switching unit. And after a fault signal reported by the detected IGBT power assembly through the driving switching unit is received, the key electrical parameters and / or the temperature data are / is detected to be abnormal, or a control instruction sent by the upper computer is received, the main control unit stops generating the PWM driving signal, and the main control unit is further used for uploading the key electrical parameters, the temperature data and the fault signal to the upper computer. The device is small in size and convenient to carry, and the operation convenience is remarkably improved.

The invention provides a charging system with high-voltage protection, which relates to the technical field of elevator emergency power supply and comprises a transformer, a voltage stabilizing circuit, a sampling circuit, an on-off circuit, a surge protection circuit, a constant current and voltage stabilizing circuit and a control circuit. The transformer reduces commercial power high voltage to low voltage; the voltage stabilizing circuit provides a stable direct-current power supply for the sampling and control circuit; the sampling circuit is used for conditioning the AC voltage and outputting a feedback signal; and the control circuit performs mode analysis by utilizing a pre-judgment algorithm according to the feedback signal so as to control the on-off circuit to cut off the mains supply input or switch the output mode of the constant current and voltage stabilizing circuit. Through an intelligent protection mechanism comprising sampling, control and on-off circuits, the device can be suitable for single-phase electric equipment, and quick and accurate response to abnormal high voltage is realized. And the transformer is adopted for voltage conversion and isolation, and the surge protection circuit and the on-off circuit are combined, so that the protection performance is ensured, and the overall cost and size of the system are effectively controlled.

A gate driver system for a multi-phase inverter includes a gate controller, a gate driver circuit, and a hybrid switch power module integrated into a phase leg of the multi-phase inverter. The hybrid switch power module includes a first semiconductor switch connected in parallel with a second semiconductor switch. The first semiconductor switch has first conduction characteristics, while the second semiconductor switch has second performance characteristics. The gate driver circuit includes a gate driver, a first variable resistance circuit, and a second variable resistance circuit. The first variable resistance circuit is powered by a first low-voltage DC power bus, while the second variable resistance circuit is powered by a second low-voltage DC power bus.The first variable resistance circuit is connected to a first gate of the first semiconductor switch, while the second variable resistance circuit is connected to a second gate of the second semiconductor switch.