1099 results about "Voltage reduction" patented technology

The invention relates to the technical field of power grid deicing, in particular to an alternating current short circuit ice melting control method and an ice melting distribution transformer. The invention discloses a distribution transformer with voltage reduction and ice melting dual functions, an ice melting control system and a control method thereof. The transformer is provided with two groups of low-voltage output ends which are respectively used for power distribution, power supply and ice melting operation; the ice melting control system comprises a local intelligent control box and a far-end communication control box, and adopts a deep reinforcement learning model to calculate an optimal ice melting power gear and ice melting time; according to the control method, environment parameters and equipment parameters are obtained, cooperative control of the boundary switch, the ice melting switch, the protection switch and the short circuit switch is combined, and accurate adjustment of the ice melting process is achieved. The system realizes a one-key ice melting function, has the characteristics of simple operation, high ice melting efficiency, remote control and the like, remarkably improves the intelligent level, safety and reliability of power grid ice melting operation, and provides an innovative solution for anti-ice management of a power system.

The invention provides a clock input buffer and electronic equipment. The clock input buffer comprises a multi-protocol input circuit, a level conversion circuit, a step-down circuit and a clock buffer circuit. The multi-protocol input circuit is adjusted to different working modes through a control signal transmitted by the control unit so as to be compatible with various input protocols, the multi-protocol input circuit processes an input signal based on a target working mode, and the level conversion circuit performs level shifting on an output signal of the multi-protocol input circuit so as to realize multi-protocol conversion. The voltage reduction circuit is used for converting the output signal into a low-voltage domain signal so as to meet the working voltage requirement of the clock buffer circuit, and meanwhile, the voltage reduction circuit is used for reducing the power supply voltage so as to provide low-voltage power supply voltage for the clock buffer circuit; therefore, the clock buffer circuit can buffer high-speed signals in different input protocols and voltage ranges by using a low-voltage domain device, and the application scenarios of the clock input buffer are greatly expanded.

The utility model relates to the technical field of backlight power supplies, aims to solve the technical problems of large misoperation and poor stability of a backlight circuit, and discloses a backlight control circuit, which comprises a voltage reduction module U12 for reducing the voltage of a power supply VCC1 into a power supply VCC2, a backlight controller U10 and an enable circuit, and the enable circuit comprises a triode Q14 and a triode Q12. The output end of the voltage reduction module U12 is connected with the enabling end of the backlight controller U10 through a resistor R68, the overvoltage protection circuit comprises an NMOS tube Q11, the source electrode of the NMOS tube Q11 is grounded, the drain electrode of the NMOS tube Q11 is connected with the enabling end of the backlight controller U10, the grid electrode of the NMOS tube Q11 is connected with a first series voltage division circuit, the triode Q12 indirectly controls power supply of the voltage reduction module U12 by controlling the on-off state of the triode Q14, and the voltage reduction module U12 indirectly controls the power supply of the backlight controller U10. An NMOS tube Q11 and a first series voltage division circuit in the overvoltage protection circuit are used for monitoring the voltage of a power supply VCC1 in real time. When the voltage is too high, the NMOS tube Q11 is switched on, the enabling end voltage is directly lowered, and work is stopped, so that overvoltage protection is achieved.

The invention discloses a power grid voltage safety and stability control method and system based on TCRN and GOA, and relates to the technical field of power grid voltage safety and stability control, and the method comprises the steps: giving a voltage reduction interval weight to refine the power grid stability influence, and building a voltage stability evaluation quantitative index; constructing a voltage stability prediction model based on the voltage stability evaluation quantitative index, and predicting the relation between the voltage state and the stability; and through a prediction result, constructing a voltage stability control model, and outputting an optimal generator shedding and load shedding strategy. According to the method, a voltage stability prediction model based on a time sequence convolution residual network is constructed, the relation between sensitive node voltage time sequence characteristics and voltage stability is mapped, a control strategy is output by constructing a voltage stability control model, the pelican optimization algorithm is used for solving the control model with the advantages of being high in convergence speed and high in search capability, and the voltage stability prediction model is used for predicting the voltage stability. And outputting the optimal generator shedding and load shedding strategy.

The utility model relates to the related field of voltage reference circuits, in particular to a voltage reference circuit with a simple structure and capable of realizing high-voltage application, which comprises a resistor R5 connected with a high-voltage power supply, MOS (Metal Oxide Semiconductor) transistors PM1, PM2 and PM3, triodes Q0, Q1 and Q2, and MOS transistors NM0 and NM5, compared with a traditional structure, the circuit is simple in structure and easy to implement, and due to the fact that an operational amplifier and a band-gap reference circuit are not needed, and the number of electronic components is small, the circuit area is greatly reduced; the high-voltage-resistant voltage-reducing and voltage-stabilizing circuit is simple in structure, low in process requirement, free of a high-voltage process and free of additional special devices, adopts a low-voltage process to enable the circuit to generate a low-voltage reference capable of bearing a high-voltage power supply of more than 100V, achieves the purposes of high-voltage resistance, voltage reduction and voltage stabilization, and has the characteristics of low cost and convenience in design, so that the high-voltage-resistant voltage-reducing and voltage-stabilizing circuit has very high use value and application value and is suitable for popularization.

The invention discloses a voltage fault detection device of a three-phase alternating current power supply, a motor controller and a voltage fault detection method thereof, and the device comprises a sampling unit which carries out the separation sampling of each phase of current in three-phase current from a rectification front end, and obtains the sampling voltage of each phase; the step-down unit is used for carrying out step-down on the sampling voltage of each phase to obtain the step-down voltage of each phase; the clamping unit is used for clamping the reduced voltage of each phase to obtain clamping voltage of each phase; the filtering unit is used for filtering the clamping voltage of each phase to obtain filtering voltage of each phase; and the control unit determines whether the phase voltage of each phase of the three-phase alternating-current power supply has a fault according to the filtering voltage of each phase so as to protect the three-phase alternating-current power supply and a load thereof. According to the scheme, the three-phase input current of the three-phase alternating-current power supply is separated and sampled from the rectification front end of the input side of the three-phase alternating-current power supply to obtain the sampling voltage, and fault detection is performed after voltage reduction, clamping and filtering, so that the accuracy of fault detection is improved.

The utility model discloses outdoor operation equipment which comprises a battery bin with an opening, the battery bin comprises a bottom plate and a plurality of side plates arranged on the bottom plate in a surrounding mode, and at least one side plate is provided with a first terminal; the battery pack is provided with a second terminal, the battery pack is configured to be detachably assembled in the battery compartment along the opening, and when the battery pack is assembled in the battery compartment, the second terminal is in electric signal connection with the first terminal; the power management device is connected with the first terminal through a wire harness, a first voltage reduction module is arranged in the power management device, and the first voltage reduction module can obtain the voltage of the battery pack and perform voltage reduction processing; and the cooling fan is arranged on the side plate and is connected with the power supply management device through a wire harness, the cooling fan can obtain the electric energy of the battery pack subjected to the voltage reduction processing of the first voltage reduction module, and the battery pack can be cooled through the operation of the cooling fan. According to the outdoor operation equipment, wire harnesses connected to the battery bin, the cooling fan and the power management device can be saved, and the overall layout is more reasonable.

The invention relates to the technical field of communication control, and discloses a wireless control system for an intelligent trolley, which comprises a wireless module, a controller module, a communication adaptive module, a voltage reduction module, an ultrasonic module and a motor driving module. Wherein the communication adaptive module analyzes a communication environment in real time through a machine learning algorithm, and dynamically adjusts communication protocol parameters of the wireless module according to an analysis result so as to adapt to different communication conditions. The module can collect and analyze various key communication environment parameters including signal intensity, noise level, channel occupancy rate and the like, thereby ensuring that the system can maintain high communication efficiency and stable connection in various complex and changeable communication environments. According to the wireless control system, the performance of the intelligent trolley and the universality of application scenes are remarkably improved.

The present invention provides a power converter, a resisting method in inductive load switching, and a power generation system. The power converter includes a direct current input end, an alternating current output end, a bus capacitor, a DC / AC power conversion circuit, and a controller. The direct current input end is configured to connect to a direct current source. The alternating current output end is configured to connect to a load. The bus capacitor includes a positive bus capacitor and a negative bus capacitor that are connected in series. The positive bus capacitor is connected to a positive direct current bus. The negative bus capacitor is connected to a negative direct current bus. The DC / AC power conversion circuit is connected in parallel between the positive direct current bus and the negative direct current bus, and configured to convert a direct current from the direct current source into an alternating current, and transmit the alternating current to the load through the alternating current output end. The controller is configured to control, based on an even harmonic current on a connection line between the DC / AC power conversion circuit and the load, an output voltage at which the power converter outputs the alternating current, to reduce an absolute value of a voltage difference between the positive bus capacitor and the negative bus capacitor.

A Hybrid Switched Capacitor Converter (HSCC) topology is presented that is suitable for high conversion ratio Point-of-Load (PoL) applications. The topology specifically targets 48V to 1V power delivery in space-based high-performance computing systems, where size and weight are important considerations, along with device de-rating for radiation tolerance. One implementation merges an initial 2:1 switched capacitor conversion stage with a symmetric dual inductor hybrid (SDIH) conversion stage, reaping benefits of both. The SDIH stage offers reduced component count and an excellent switch stress figure of merit, while the initial 2:1 voltage reduction stage significantly reduces the volume of flying capacitors, enabling compact size and low weight.

The invention discloses an energy-saving server operation method and system based on dynamic load adjustment, and relates to the technical field of servers. The energy-saving server operation method comprises the steps that a plurality of heterogeneous resources in a single physical machine are made to generate a plurality of virtual heterogeneous resource units through a pooling method and a virtualization method, and the heterogeneous resources in each virtual heterogeneous resource unit are different in proportion. According to the method, through establishment of a first framework, the first framework supports collaborative management and scheduling among various heterogeneous resources, the first framework dynamically adjusts the scale of a virtual heterogeneous resource unit for a single physical machine through load calculation, comparison and triggering conditions, and the virtual heterogeneous resource unit is optimized on the basis of the reduced scale. And meanwhile, different voltage reduction and frequency reduction are carried out on each heterogeneous resource in a single physical machine, so that the energy consumption of the physical machine is reduced, the voltage reduction and frequency reduction are respectively carried out on each heterogeneous resource, and the effective cooperative scheduling of the heterogeneous resources is ensured.

The invention discloses a self-excitation cooperative energy management circuit for enhancing TENG output performance, and belongs to the technical field of power electronics. The self-excitation cooperative energy management circuit is connected to the rear end of the TENG and comprises a self-charge excitation circuit, a capacitance converter circuit and a voltage reduction circuit, and the self-charge excitation circuit is connected to the rear end of the TENG, comprises a rectification circuit and is used for charge excitation of the TENG, rectification and output of a first direct current signal; the capacitance converter circuit is connected to the rear end of the self-charge excitation circuit and is used for performing power conversion on the first direct-current signal and outputting a second direct-current signal; the voltage reduction circuit is connected to the rear end of the capacitance converter circuit, comprises a switching circuit and is used for reducing voltage and increasing current of the second direct-current signal and outputting a third direct-current signal. According to the self-excitation collaborative energy management circuit, the charge output capability of the TENG can be greatly improved, and an electronic device can be directly driven.

The invention discloses a method and system for identifying the same source of voltage sags. The identification method comprises the following steps: obtaining sag monitoring data recorded by a power grid voltage sag monitoring device; based on the propagation law of voltage sag waveforms between multi-stage transformers, using a Hausdorff distance algorithm to measure the waveform similarity between multiple groups of sag monitoring data, and using an effective value absolute difference method to calculate the duration of the sag; deriving a transfer formula for a phase jump value through a transformer, using a linear interpolation method to accurately calculate the phase jump value in the sag process, and using the Euclidean distance to respectively calculate the similarity of the phase jump values ​​of multiple sag waveforms; obtaining characteristic indicators of voltage sag data, including waveform similarity, duration and phase jump three-dimensional features, forming voltage sag data points, and jointly forming a same source identification clustering matrix; counting the number of clustering result clusters based on the color of data points in a point cloud image, and outputting the number of sag same source data groups and the clustering results.

The invention belongs to the technical field of new energy automobile lithium battery thermal runaway early warning, and particularly discloses a lithium battery thermal runaway gas early warning system. The method is used for solving the problem that thermal runaway cannot be rapidly and accurately detected and early warning cannot be carried out in advance in the existing monitoring technology. The early warning system comprises a main control unit, a core processing unit, a graphical user interface, a dual-frequency driving signal generation circuit, a spectral signal dual-frequency demodulation circuit, a temperature control circuit, a constant current source and overcurrent protection circuit, a spectral data acquisition circuit, a graphical user interface, an optical system, a gas sampling device and an early warning model. The power supply of the early warning system adopts a three-stage voltage reduction design, and comprises an AC-DC switching power supply, a DC-DC switching power supply and a low dropout regulator. Based on the off-axis integral cavity optical path coupling technology of the double-optical wedge group, the light beam angle is accurately adjusted through the double optical wedges of the stepping motor, a beam combiner does not need to be used, and the light energy utilization rate and the detection sensitivity are improved.

The invention discloses a power supply control system and method for an eVTOL low-voltage distribution box, and relates to the technical field of power supply control, and the system comprises a multi-source double-bus power supply unit, a voltage reduction unit and an output unit. The multi-source double-bus power supply unit comprises a first bus independent power supply channel and a second bus independent power supply channel, the first bus independent power supply channel and the second bus independent power supply channel are isolated based on a contactor, the first bus independent power supply channel comprises x heterogeneous power sources and x ideal diodes, and the x heterogeneous power sources comprise a high-voltage-to-low-voltage DC-DC power source, a ground power source and n lithium battery power sources. The second bus independent power supply channel comprises y paths of heterogeneous power supplies and y ideal diodes, and the y paths of heterogeneous power supplies comprise y paths of lithium battery power supplies; the step-down unit comprises m paths of DC-DC step-down converters; and the output unit comprises m ideal diodes which are connected in parallel with the output end of the DC-DC buck converter. According to the invention, the stability and quality of power supply are ensured, and airborne equipment is ensured to work in a stable voltage and current environment.

The invention discloses a voltage reduction device and system of a driving motor and a vehicle. The device comprises a controller and a voltage reduction circuit. The controller is connected with the step-down circuit and is used for sending a step-down signal to the step-down circuit if the required working voltage of the first driving motor is smaller than the voltage of the power battery; the step-down circuit is used for reducing the voltage provided by the power battery to the required working voltage in response to the step-down signal and then transmitting the voltage to the first driving motor. Therefore, according to the device, the voltage provided by the power battery is reduced to the required working voltage and then transmitted to the first driving motor, it can be guaranteed that the first driving motor works at a high-efficiency point, and therefore the energy consumption of the whole vehicle is reduced.

According to the control circuit and the control method of the vehicle charger disclosed by the invention, the rectifier bridge of the bridge PFC is removed, so that the number of switching devices is reduced, the topological cost is reduced, and the loss is reduced; power factor correction is realized through average current control, and stable 400V direct current is output for post-stage power supply after power grid side 220V alternating current is rectified; the rear-stage resonant converter is highly symmetrical in structure and has the advantages of high power density, strong energy interactivity, input and output isolation and easy realization of soft switching; a hybrid modulation strategy is adopted for the resonant converter, frequency modulation and extended phase shift segmented modulation are adopted under the normal load condition, the problem that the frequency modulation range is narrow during voltage reduction is solved, intermittent Bang-Bang charge control is switched under the light load condition, and the problems that the output voltage drift is high and the efficiency is reduced during light load are solved; therefore, the charging efficiency of the vehicle-mounted charger is improved.

According to the optical fiber laser constant-current driving circuit and the optical fiber laser, through the combined design of the front-stage BUCK voltage reduction module and the rear-stage linear constant-current control module, the working efficiency of a driving power supply can be effectively improved, and ripples in output current can be remarkably reduced. The preceding stage BUCK voltage reduction module realizes efficient voltage reduction through switch control, ensures voltage stability, and reduces energy loss at the same time. And the backward-stage linear constant-current control module keeps the constancy of the current by accurately adjusting the output current, so that the current ripple is further reduced, and the high requirement of the fiber laser on constant-current driving is met. The design ensures that the circuit outputs stable and low-ripple constant current while efficiently converting voltage, and the performance and reliability of the fiber laser driving power supply are greatly improved.

The utility model provides a photovoltaic inverter which is characterized in that a direct current side interface is connected with the direct current side of a DC / AC conversion circuit through a first DC / DC conversion circuit; furthermore, when EL detection needs to be carried out on the photovoltaic string, the photovoltaic string can be reversely operated in a rectification mode through the DC / AC conversion circuit, and then EL power supply is provided for the photovoltaic string to be detected through the first DC / DC conversion circuit; the power supply process can be automatically realized by the controller in the photovoltaic inverter, so that the problems of tedious and inconvenient detection process and high error rate caused by a manual detection scheme can be avoided, and the operation cost and the labor cost of detection personnel can be saved. Besides, due to the existence of the first DC / DC conversion circuit, a first-stage voltage reduction function can be provided for the reverse flow process, and a relatively high voltage obtained after reverse rectification of the DC / AC conversion circuit can be reduced, so that the finally obtained voltage is matched with a photovoltaic group string with a relatively low open-circuit voltage level, and the photovoltaic equipment is further prevented from being damaged due to relatively high reverse flow voltage.

The application belongs to the technical field of high-voltage electrical test and detection, and relates to a disc-type insulator alternating current withstand voltage multi-channel leakage current detection method and system. The method comprises the following steps: setting a parameter set comprising a withstand voltage, a frequency, a voltage raising and stabilizing strategy, sampling parameters, a judgment threshold and a consistency threshold, and generating a version identifier; constructing equipotential boundaries and voltage grading electrodes, and organizing a high-voltage end of a to-be-detected insulator, an independent measurement loop and a common ground reference point; synchronously sampling each loop during voltage raising and stabilizing to obtain a multi-channel sequence; filtering and windowing the sequence to obtain an effective value and a stability index; compensating and calculating a consistency index; combining the threshold, a ground state and a communication state to output a judgment and an event marker, triggering voltage reduction or disconnection, and structuring evidence. The technical scheme of the application is suitable for batch detection of alternating current withstand voltage, and can realize judgment robustness and channel consistency control.

The invention discloses a voltage conversion module, a chip, electronic equipment and a circuit control method, and belongs to the technical field of circuits. The voltage regulation circuit comprises a battery module and a load, and under the condition that the battery module provides a first voltage within a first preset voltage range for a voltage conversion module, the voltage conversion module is used for reducing the first voltage provided by the battery module and outputting a second voltage, maintaining the second voltage stable or maintaining the voltage reduction ratio between the first voltage and the second voltage stable; and under the condition that the battery module provides a third voltage in a second preset voltage range for the voltage conversion module, the voltage conversion module is used for boosting the third voltage provided by the battery module and outputting a fourth voltage to maintain the fourth voltage stable or maintain the boosting ratio between the third voltage and the fourth voltage stable. And the flexibility of adjusting various input voltages by the voltage conversion module is improved.

The invention provides a voltage stabilizer based on voltage conversion, a control method and a storage medium, and the voltage stabilizer comprises a PFC chopping boost circuit which receives an input alternating current and a boost duty ratio, carries out the chopping boost of the input alternating current based on the boost duty ratio, and outputs a high-voltage chopping alternating current signal; the positive and negative half-cycle filter circuit is connected with the PFC chopping booster circuit and is used for rectifying and filtering the high-voltage chopping alternating-current signal to obtain a positive voltage-stabilizing chopping alternating-current signal and a negative voltage-stabilizing chopping alternating-current signal; the positive and negative half-cycle voltage reduction and stabilization circuit is connected with the positive and negative half-cycle filter circuit, receives the voltage reduction duty ratio, and performs voltage reduction and stabilization on the positive voltage stabilization chopping alternating current signal and the negative voltage stabilization chopping alternating current signal based on the voltage reduction duty ratio to obtain a preset actual positive electric signal and a preset actual negative electric signal; and the output voltage merging circuit is connected with the positive and negative half-cycle voltage reducing and stabilizing circuit, and integrates the preset actual positive electric signal and the preset actual negative electric signal to obtain a voltage stabilizing electric signal. According to the invention, the voltage fluctuation is quickly responded at low cost.

The invention discloses a passive multi-stage voltage soft turn-off circuit suitable for SiC MOSFETs. The passive multi-stage voltage soft turn-off circuit comprises a driving main branch, a plurality of voltage reduction branches, a driving resistor, a discharging resistor and a driving power supply circuit. The driving power supply circuit is powered by a positive power supply VCC when the SiC MOSFET is turned on, and is powered by a negative power supply VEE when the SiC MOSFET is turned off. The voltage reduction branches are connected to the two ends of the driving main branch in parallel. The step-down branch comprises a step-down delay unit, a step-down action unit and a step-down unit which are sequentially connected in series; the delay time of each step-down branch is increased in sequence, and the step-down voltage drop is increased in sequence. According to the invention, the voltage level can be conveniently controlled by changing the number of the voltage reduction branches, an additional power supply module does not need to be added, the voltage reduction time can be controlled by the voltage reduction delay branches, the degree of freedom of driving is greatly increased, and the circuit is low in complexity, high in voltage reduction degree of freedom and high in reliability.

A power transmission system and a charging power supply converter relate to the technical field of power supply. The power transmission system comprises a voltage reduction module and a multi-output DC-DC conversion module. The voltage reduction module comprises a voltage input end, a first power supply input end and a second power supply input end; the voltage input end is used for acquiring an input voltage so as to reduce the input voltage and generate a power supply voltage; a power supply voltage supplies power to a battery connected with the power transmission system through the first power supply input end; the second power supply input end is used for outputting node voltage. The multi-output DC-DC conversion module comprises an inductor and at least two output circuits, and the first end of the inductor is connected with the second power supply input end to obtain node voltage; and the input end of each output circuit is connected with the second end of the inductor and is used for carrying out voltage conversion on the node voltage so as to generate corresponding load voltage, and the load voltage supplies power to a load connected with the corresponding output circuit through the output end of the output circuit.

A pulse generator is disclosed. The pulse generator includes a DC source; a plurality of switches, a transformer; and a pulsing output. The pulse generator can be coupled with a plasma chamber. The pulsing output outputs high voltage pulses having a peak-to-peak voltage greater than 1 kV and a voltage portion between consecutive high voltage bipolar pulses that has a negative slope that substantially offsets the voltage reduction on a wafer within a plasma chamber due to an ion current. The resulting voltage at the wafer may be substantially flat between consecutive pulses.

The invention discloses a harmonic and super-harmonic measuring system and measuring method based on the CVT capacitive current principle, and belongs to the technical field of harmonic and super-harmonic measurement. According to the method, capacitive current analog signals on a voltage dividing capacitor C1 and a voltage dividing capacitor C2 are collected, the capacitive current analog signals are transmitted to a harmonic and super-harmonic measuring device, and the harmonic and super-harmonic measuring device measures the harmonic and super-harmonic. And the harmonic and super-harmonic measuring device is used for restoring a primary side total voltage waveform based on the capacitance current analog signal, the equivalent capacitance of the voltage dividing capacitor C1 and the equivalent capacitance of the voltage dividing capacitor C2. Influences of internal inductance and capacitance equivalent resistance of the capacitive voltage divider are considered, a primary side voltage reduction formula of the capacitive current method is corrected, and the corrected capacitive current method is suitable for ultra-harmonic measurement.

The utility model discloses a power supply device of a tablet personal computer and the tablet personal computer, and relates to the field of power supply. The input positive end of a voltage reduction module is connected with the output positive end of a power supply, the input negative end is connected with the output negative end of the power supply, and the output positive end is connected with the positive electrode of a power supply loop of the tablet personal computer; the output negative end is connected with the negative electrode of a power supply loop of the tablet computer; the voltage reduction module is used for reducing the output voltage of the power supply and then supplying power to the tablet computer; the simulation module is connected with a detection end of a main control chip of the tablet computer, and the simulation module is used for generating a simulation in-place signal when the battery is not in place, so that the main control chip detects that the battery is in place and controls the power supply loop to supply power to the tablet computer. A simulation in-place signal provided by the simulation module can avoid the situation that when the battery is not installed, the main control chip cannot detect that the battery is in place and cannot control the tablet personal computer to be started. The voltage reduction module can reduce the voltage output by the power supply and then supply power to the tablet personal computer, and the voltage reduction module and the simulation module replace a battery.

A power conversion device is provided. The power conversion device is applied to a circuit topology and layout of the six-switch flying capacitor voltage reduction type conversion circuit which is applied to the intermediate bus converter. The layout of the transformer and the inductor is provided, so that the parasitic resistance of the winding in the magnetic core assembly is minimum. An auxiliary switch and an auxiliary winding are additionally arranged on the six-switch flying capacitor voltage reduction type conversion circuit, and the auxiliary switch and the auxiliary winding are used for providing enough energy for the output end when the input voltage is lower than four times of the output voltage. A switch layout is provided to reduce parasitic parameters and power losses of a transformer winding AC loop, and parasitic parameters and power losses on the switch bridge arm path.

The utility model discloses a double-coil contactor, and the contactor comprises a power module which is used for accessing an external power supply voltage to generate a DC voltage, so as to enable a coil loop to be electrically conducted, and carrying out the voltage reduction of the DC voltage, and obtaining a power supply voltage; the external power supply is an AC power supply or a DC power supply; the sampling comparison module is used for sampling the direct-current voltage and generating a working voltage according to the power supply voltage when the sampling voltage is greater than a preset voltage threshold value; the driving module is used for controlling the pull-in coil loop to be electrically conducted based on the direct current voltage in response to the power supply voltage and the working voltage, and controlling the pull-in coil loop to be electrically disconnected in response to the trigger signal; the time delay module is used for generating a trigger signal when the duration of electrical conduction of the pull-in coil loop reaches a preset duration. According to the double-coil contactor, the AC voltage of the AC power supply can be converted into the DC voltage for control through the power supply module, and the application range of the double-coil contactor is greatly expanded.

The utility model provides a master control device and a carrier, the master control device comprises a master control circuit board, a master control unit and a plurality of module interfaces, the master control unit and the module interfaces are both arranged on the master control circuit board, the master control device further comprises a power supply voltage conversion module and a power supply input interface, the power voltage conversion module and the power input interface are both arranged on the main control circuit board, the power supply voltage input end of the main control unit is electrically connected with the main control voltage output end of the power voltage conversion module, and the input end of the power voltage conversion module is electrically connected with the power input interface. The plurality of module voltage output ends of the power supply voltage conversion module are electrically connected with the plurality of module interfaces respectively. According to the utility model, the power supply voltage conversion module is directly integrated on the main control circuit board of the main control device, so that the power supply voltage conversion module for realizing voltage reduction does not need to be independently arranged at other positions of the carrier, the number of cables in the carrier is reduced, the wiring space is saved, and the space utilization rate is improved.