274 results about "Reverse connection" patented technology

The invention discloses an anti-reverse-connection and power-adjustable showing stand integrated power taking device and a control method, and relates to the related field of showing stands, the anti-reverse-connection and power-adjustable showing stand integrated power taking device comprises a layer plate assembly, a lamp tube assembly, a power taking assembly, a showing stand assembly, a driving rod assembly and a plug assembly, the lower end of the layer plate assembly is rotationally connected with the lamp tube assembly, and the rear end of the layer plate assembly is fixedly connected with the power taking assembly; the rear end of the laminate assembly is in sliding connection with the showing stand assembly, stepless adjustment of the brightness of a lamp tube is achieved through the PWM technology, and diversified showing requirements are met; a driving assembly is innovatively combined with intelligent heat dissipation, so that stable operation of equipment is ensured; a unique pneumatic emergency power-off mechanism provides physical-level safety protection, response is rapid and reliable, the functions of manual and electric dual-mode operation, remote intelligent control, emergency lighting and the like are integrated, the industrial pain points that a traditional showing stand is tedious in installation and inconvenient to adjust, has potential safety hazards and the like are solved, and perfect unification of safety, flexibility and intelligence is achieved.

The invention discloses a car coupler state detection and execution control circuit and a car coupler automatic picking and hanging system and method, and relates to the technical field of railway vehicle automation control, and the car coupler state detection and execution control circuit comprises a state detection unit which comprises a plurality of non-contact sensors arranged at different detection positions of a car coupler; the safety execution unit comprises a 2oo2 interlocking structure formed by a first relay and a second relay which are connected in series, a through-type Hall current sensor arranged on a main loop between the first relay and the second relay, and a third relay for controlling the extension and retraction directions of an electric push rod; the power supply management unit comprises a 24VDC power supply input terminal, a fuse, a reverse connection protection diode and a surge suppression TVS (Transient Voltage Suppressor) tube; wherein the output end of the state detection unit is connected to the input port of the controller, and the output port of the controller is connected to the control end of the safety execution unit. The safety of the system is improved through a hardware-level redundant architecture, and the reliability of coupler state detection is improved through multi-sensor fusion.

The invention discloses a full-link fault isolation control method and device for an eVTOL low-voltage distribution box, and the method comprises the steps: carrying out the monitoring processing of an input voltage through an independent overvoltage protection circuit in a protection circuit, and obtaining monitoring voltage data; an independent ideal diode in the protection circuit monitors the current direction of the input end to obtain a monitored current direction; the protection circuit performs fault isolation control processing on the external power supply and the low-voltage power supply according to the monitored voltage data and the monitored current direction; and performing fault isolation control processing on a full-link fault of power supply in the eVTOL low-voltage distribution box based on a multi-stage isolation redundancy architecture. In the embodiment of the invention, quick response is realized on a hardware level, and a full-link isolation redundancy design is adopted, so that a fault is accurately limited in a local area, fault diffusion is prevented, and the reliability of a system is improved; positive and negative electrode reverse connection protection is integrated, static electricity and surge are prevented, and various abnormal inputs can be effectively resisted.

The invention relates to a wide voltage input protection control circuit and a vehicle-mounted terminal. The circuit comprises an anti-reverse connection module, an overvoltage protection module, an under-voltage protection module and a control module. The anti-reverse connection module is used for generating a polarity detection result of the vehicle-mounted power supply and performing primary on-off control on a connecting line according to the polarity detection result; the overvoltage protection module is used for generating an overvoltage detection result of the vehicle-mounted power supply, the undervoltage protection module is used for generating an undervoltage detection result of the vehicle-mounted power supply, and the control module is used for performing secondary on-off control on a connecting line according to the overvoltage detection result and the undervoltage detection result; and according to the connection line combining the first-stage on-off control and the second-stage on-off control, the vehicle-mounted power supply provides stable power supply for a post-stage circuit within a preset wide voltage input range. By adopting the method, stable and safe electric energy supply can be realized in a preset wide voltage input range, and the reliability and the service life of the vehicle-mounted terminal under complex working conditions are improved.

The invention relates to the technical field of battery management, and discloses an energy storage battery pack polarity reverse connection prevention method, which is applied to a battery array management unit, and comprises the following steps: generating a high-voltage power-on instruction which comprises the number of a battery pack needing to be powered on currently; sending a high-voltage power-on instruction to any sub-battery management unit; and receiving the reverse connection detection result sent by the sub-battery management unit, and determining whether to control the power-off of any sub-battery management unit according to the reverse connection detection result, so that the situation of safety accidents of the energy storage system caused by power-on after reverse connection of the battery pack in the energy storage system can be avoided, and the safety of battery pack management is improved.

The embodiment of the utility model provides a charger output anti-reverse connection and anti-reverse charging protection device, and belongs to the technical field of charging safety. The charger output anti-reverse connection and anti-reverse charging protection device comprises a relay arranged at the output end of a charger and used for executing connection / disconnection of a charging loop through actuation / disconnection; the relay is connected with a relay control circuit and is used for controlling the relay to be switched on or switched off along with the voltage state of the charging loop; the detection circuit is connected to the charging loop and used for responding to the voltage state of the charging loop; and the charging loop is also connected with the relay control circuit, and transmits the voltage state to a relay driving module of the relay control circuit in real time. According to the scheme of the utility model, complicated signal judgment is not needed, passive control is realized only by depending on the voltage state, the system complexity is reduced, the protection on the charger and the battery is enhanced, and the service life of equipment is prolonged.

The utility model discloses an anti-reverse connection protection circuit, which comprises a voltage dividing module, an MOS tube, a voltage stabilizing diode and a voltage stabilizing module, and is characterized in that the voltage stabilizing module and the voltage dividing module are connected in parallel with a power supply input and a power supply output, and the voltage dividing module is connected in parallel with the power supply input and the power supply output; the voltage dividing module at least comprises a first partial voltage and a second partial voltage which are sequentially connected in series in the current flowing direction in the normal working state, the MOS tube is connected with the voltage stabilizing diode in parallel, the MOS tube is connected with the second partial voltage in parallel, the grid electrode of the MOS tube is connected with the first partial voltage, the drain electrode of the MOS tube is connected with the negative electrode of the power input, and the first partial voltage and the second partial voltage are connected in parallel. The source electrode of the MOS tube is connected with the negative electrode of the power supply output, the negative electrode of the voltage stabilizing diode is connected with the source electrode of the MOS tube, and the positive electrode of the voltage stabilizing diode is connected with the grid electrode of the MOS tube. The MOS tube is arranged to control the output of the direct current, and the MOS tube can be turned off to cut off the output of the power supply when the input is reversely connected. And meanwhile, a voltage dividing module, a voltage stabilizing module and the like are combined to protect the circuit together with the MOS tube.

The utility model relates to a DMS vehicle-mounted host power supply plug-in, which comprises a connector, a switch, a fuse, a circuit board, an indicating lamp circuit and a panel, the connector is connected with a train DC110V power supply, the other end of the connector is connected with a surge protection circuit, a common mode filter circuit and an anti-reverse-connection circuit through the switch and the fuse, the other end of the anti-reverse-connection circuit is connected with a slow start circuit, and the panel is connected with the indicating lamp circuit. The slow start circuit is electrically connected with the isolation circuit and the DC / DC power supply module; the isolation circuit is used for detecting current and voltage values of the DC / DC power supply module, the output end of the isolation circuit is connected with an MCU chip, the DC / DC power supply module is provided with a temperature detection circuit, and the output end of the temperature detection circuit is connected with the MCU chip; the output end of the MCU chip is connected with the control end of the DC / DC power supply module, and the output end of the DC / DC power supply module is connected with the output power supply interface. The utility model provides a safe and reliable system power supply for the vehicle-mounted host.

The utility model relates to a power supply control circuit supporting AC / DC input and a shared power bank cabinet, comprising an AC input interface, a DC input interface, an anti-reverse connection circuit, a decoy circuit and a DC / DC conversion circuit, the DC input interface comprises a power supply port and a fast charge protocol port; the alternating current input interface is electrically connected with a cabinet main board supporting alternating current and direct current input and used for being connected with an alternating current power supply. A power supply port of the direct current input interface is connected with the reverse connection prevention circuit, and a fast charging protocol port is connected with the decoy circuit and used for being connected with a direct current power supply; the output end of the reverse connection prevention circuit is connected with the decoy circuit and the DC / DC conversion circuit. According to the cabinet machine, alternating current is accessed through the alternating current input interface, direct current is accessed through the direct current input interface, a direct current power supply with a fast charging protocol can be supported by arranging the decoy circuit, and the problem that a traditional cabinet machine is single in power supply input type is solved.

The utility model relates to a three-phase wiring detection system, and the system comprises a confluence module which comprises a first terminal and a second terminal, and a first port, a second port and a third port of the first terminal are correspondingly connected with the live wire ends of a first micro-inverse module, a second micro-inverse module and a third micro-inverse module respectively. The fourth port of the first terminal is connected with the zero line end of each micro-inverse module, and the four ports of the second terminal are correspondingly connected with the four ports of the first terminal respectively; the first end of the switch control module is connected with the second terminal, the second end is connected to a three-phase power grid, and the switch control module comprises four switches correspondingly connected with a live wire and a zero wire of the three-phase power grid respectively; the gateway controller is connected to a three-phase power grid, is in wireless connection with each micro-inverse module, and is used for obtaining the port voltage of the micro-inverse module in a two-phase control state through wireless connection according to the phase sequence information corresponding to each micro-inverse module, determining whether a reverse connection fault exists or not based on the port voltage, and sending the reverse connection fault to the micro-inverse module. The system can improve the detection efficiency and accuracy of wiring detection.

This invention provides a DC power input reverse connection compatible circuit, a power supply circuit, and a household appliance. The DC power input reverse connection compatible circuit includes a first diode, a second diode, a third diode, and a control switch. The anode of the first diode is electrically connected to the positive input terminal, and the cathode of the first diode is electrically connected to the positive output terminal. The cathode of the second diode is electrically connected to the positive output terminal, and the anode of the second diode is electrically connected to the negative output terminal. The anode of the third diode is electrically connected to the negative output terminal, and the cathode of the third diode is electrically connected to the negative input terminal. The first terminal of the control switch is electrically connected to the negative input terminal, and the second terminal of the control switch is electrically connected to the positive output terminal. A reverse connection detection circuit is used to acquire the reverse connection signal between the positive and negative input terminals, and controls the control switch to turn on or off based on the reverse connection signal. This invention is compatible with both forward and reverse DC power connections and improves circuit safety during reverse connections.

A power input interface protection circuit and a power supply relate to the technical field of power supplies. The circuit comprises a protection module, an anti-reverse connection module and a filtering module. The protection module is used for being connected with an input power supply and protecting working voltage and working current output by the input power supply; the reverse connection prevention module is connected to the overcurrent protection module and is used for disconnecting the connection with the input power supply when the input power supply is reversely connected with the protection module; and the filtering module is connected to the anti-reverse-connection module and is used for filtering the working voltage and the working current output by the input power supply and outputting the working voltage and the working current so as to supply power to a load connected with the filtering module.

Level is detected of contents of a container or drum. Systems may wirelessly report when contents of the container are nearly depleted. Components include a plug, a sensor, a structural member, a terminal connector in the plug, and internal and external cables. The plug may screw into a vent hole in the container and a signal connector on the external cable connects to the terminal connector. The connectors may be configured or have magnets to prevent reverse connection. Various embodiments have a second sensor, a wireless gateway, GPS location data, cloud data processing, or a recess to receive a tool to rotate the plug and remove the system from the container. The structural member may bend to maintain verticality.

The invention relates to the technical field of battery protection, and discloses a pure hardware charging and discharging reverse connection prevention circuit and a battery pack. The circuit comprises a battery positive electrode port, a charging positive electrode port, an anti-reverse unit and a first sampling resistor RS1, the battery positive electrode port is used for being electrically connected with a positive electrode of a battery unit, the charging positive electrode port is used for being electrically connected with a positive electrode of charging equipment, and the anti-reverse unit comprises a first switching tube Q1, an amplifying unit and a driving circuit. The battery positive electrode port, the first switch tube Q1, the first sampling resistor RS1 and the charging positive electrode port are electrically connected in sequence to form a positive electrode main loop, the amplification unit is electrically connected with the first sampling resistor RS1 and the driving circuit, the driving circuit is electrically connected with the first switch tube Q1, and the amplification unit collects a voltage value of the first sampling resistor RS1 and transmits the voltage value to the driving circuit. Therefore, the drive circuit drives the on-off of the first switch tube Q1. The technical problems of large voltage drop, serious heating, influence on battery performance and the like of a diode reverse connection prevention scheme in the prior art can be effectively solved.

The invention discloses an aircraft electric seat electronic controller and a control logic implementation method thereof. The electronic controller is composed of a seat control box, a seat operation panel, a USB charging module, a limit switch assembly and three direct current motors with Hall sensors. The seat control box internally comprises a 28V filtering circuit, an anti-reverse connection and anti-surge protection circuit, a double-path 5V isolation power supply, an optical coupler isolation logic control circuit and a motor driving circuit; the operation panel is integrated with seven film keys and a one-key reset function; the limit switch assembly provides six posture limit positions and a grounding protection signal. According to the control logic, key detection, mistaken touch prevention, limit hardware interlocking and one-key time sequence resetting are achieved through a pure hardware logic gate, and the requirements for DO-160G electromagnetic compatibility and aviation high reliability can be met without a DSP or a software program. Through the scheme of'full hardware logic + Hall closed loop ', the program design error risk is remarkably reduced, the after-sales troubleshooting cost is reduced, and the method can be quickly transplanted to various 28V airborne electric seat platforms.

This invention proposes a method, device, storage medium, and variable frequency air conditioner for detecting reverse connection of phase and neutral wires. The detection method is used in the three-phase rectifier circuit of the variable frequency air conditioner. The three-phase rectifier circuit includes a neutral wire, a DC bus, three phase wires, and a first relay, a second relay, and a third relay located on each phase wire. The detection method includes: acquiring a first voltage value of the DC bus when all three relays are closed; acquiring the current voltage value of the DC bus when any relay is open; and determining that one phase wire is reverse connected to the neutral wire when the first voltage value is not equal to the current voltage value. In this invention, there is no need to set up a separate three-phase detection circuit in the power supply circuit of the variable frequency air conditioner. The connection status of the phase and neutral wires can be determined using only the existing three-phase rectifier circuit of the variable frequency air conditioner, facilitating the miniaturization and weight reduction of the power supply circuit of the variable frequency air conditioner.

The invention provides a DC circuit breaker and a control method thereof, and relates to the technical field of power electronics. The direct current circuit breaker comprises a reverse connection detection unit, a control unit, an execution unit, an electric drive clutch mechanism and a contact unit. The output end of the execution unit is connected with the control end of the electric drive clutch mechanism. One end of the electrically-driven clutch mechanism is connected with the output end of the execution unit, and the other end of the electrically-driven clutch mechanism is connected with the driving end of the contact unit; the reverse connection detection unit is used for generating and outputting a reverse connection signal when detecting that the direct current circuit breaker is in a reverse connection state, and transmitting the reverse connection signal to the control unit; the control unit is used for generating an opening locking instruction according to the reverse connection signal and sending the opening locking instruction to the execution unit; and the execution unit is used for driving the electrically-driven clutch mechanism to move to the clutch disconnection position according to the opening locking instruction and keeping the clutch disconnection position so as to prevent the contact unit from connecting the main loop and improve the system safety.

The utility model provides a charge and discharge protection circuit for preventing reverse connection of a POS machine power supply, which comprises a POS machine power supply, a reverse connection prevention protection circuit and a current direction detection circuit, and is characterized in that the output end of the POS machine power supply is connected with the input end of the current direction detection circuit and the input end of the reverse connection prevention protection circuit; the output end of the current direction detection circuit is connected with the input end of the anti-reverse-connection protection circuit, the output end of the anti-reverse-connection protection circuit is connected with an output positive electrode and an output negative electrode, the output positive electrode and the output negative electrode can be connected with a charging power supply and a master control circuit board in the POS machine, a field effect transistor Q2 is arranged in the anti-reverse-connection protection circuit, the field effect transistor Q2 is an NMOS transistor, and the field effect transistor Q2 is connected with the input end of the anti-reverse-connection protection circuit. And a triode Q1 is arranged in the current direction detection circuit. The POS machine power supply protection circuit has the beneficial effects that the positive and negative reverse connection prevention protection function of the POS machine power supply can be realized, the loss is low, and the circuit structure is simple.

The invention discloses a power supply system capable of realizing secure access, and relates to a power supply system capable of realizing secure access and a power supply access method, the power supply system capable of realizing secure access comprises a battery, a control module, a detection module, an output control module and an output port; the output port is used for connecting an external power supply or an external load; the output control module comprises a detection loop; the detection loop is provided with a current limiting device; the detection module comprises a trigger circuit and a detection circuit, and the control module is used for conducting a detection loop according to a trigger signal, calculating a sampling voltage and judging whether a connection fault exists or not; through the control logic of'default full disconnection 'and'first detection and second power-on', a path of dangerous large current generated due to reverse connection or short circuit at the moment of connection is cut off from the source, traditional afterward fusing protection is improved to beforehand intelligent prevention, and potential safety hazards in the connection stage are thoroughly eliminated.

The embodiment of the invention provides an anti-reverse-connection slow start circuit for a direct-current power supply, and the circuit comprises an anti-reverse-connection circuit which can respond to an input voltage positively connected between a first input end and a second input end of the anti-reverse-connection circuit, and transmits the input voltage to a first output end and a second output end of the anti-reverse-connection circuit. And in response to the input voltage reversely connected between the first input end and the second input end of the anti-reverse-connection circuit, the input voltage is disconnected from being transmitted to the first output end and the second output end of the anti-reverse-connection circuit. Comprising at least one control end, the at least one control end is in one-to-one correspondence with the at least one slow start circuit, and the control circuit can control the on-off of the corresponding slow start circuit through a signal of the control end; and controlling the slow start duration of the turned-on slow start circuit through a signal of a corresponding control end determined based on the value of the impact current input to the turned-on slow start circuit. According to the embodiment of the invention, slow start and reverse connection prevention can be realized.

The invention relates to the field of electronic circuit design, and discloses an anti-reverse connection power-on soft start circuit and method, which can realize dual protection functions of anti-reverse connection and soft start and improve the safety and reliability of the circuit. The circuit is simple in design and easy to implement, and the manufacturing cost can be reduced; moreover, the anti-reverse connection soft start circuit can cut off the power supply quickly when detecting that the polarity of the power supply is wrong, thereby preventing the current from flowing reversely, improving the safety of the circuit, and prolonging the service life of the circuit.

The utility model discloses an anti-interference signal processing circuit and a fan, the circuit comprises an acquisition signal reverse connection protection unit, an acquisition signal input filtering unit, a comparator unit, a voltage dividing unit and a signal output filtering unit, the acquisition signal reverse connection protection unit is used for carrying out reverse voltage protection on an acquired PWM signal; the acquisition signal input filtering unit is used for carrying out filtering processing on the acquired PWM signals, the comparator unit is used for carrying out voltage comparison processing and output on the acquired PWM signals, the voltage dividing unit is used for adjusting comparison voltage of the comparator unit, and the signal output filtering unit is used for filtering the PWM signals output by the comparator unit. According to the utility model, false levels in the signals can be effectively identified and eliminated, the high and low level states of the output PWM signals are ensured to be clear and stable, the problems of unstable rotating speed and the like caused by abnormal PWM signals due to input signal noise and PCB noise are solved, and the rotating speed of the fan is ensured to be stable.

The utility model relates to an anti-reverse-connection and anti-backflow circuit for an MOS tube and an electronic product. The anti-reverse-connection and anti-backflow circuit comprises an MOS tube assembly and a capacitor, along the current direction, the capacitor is located at the downstream of the MOS tube assembly; the MOS tube assembly comprises a P-channel MOS tube, a first triode and a second triode; by applying the circuit provided by the invention, reverse connection prevention protection can be provided, current backflow is prevented, and the reliability of the protection circuit is improved; the whole circuit is simple in structure, the number of related elements is small, and cost is low.

The utility model belongs to the technical field of circuit breakers, and discloses an electricity taking structure of a residual-current circuit breaker and the residual-current circuit breaker. The electric leakage circuit breaker comprises a handle, an electric leakage circuit board and an electromagnetic release. The electricity taking structure of the residual-current circuit breaker comprises a first conductive piece and a handle spring. Wherein one end of the first conductive piece is electrically connected to the electromagnetic release, and the other end of the first conductive piece is close to the handle; the handle spring is installed on the handle and comprises a fixed end and a movable end, the fixed end is electrically connected with the electric leakage circuit board, and the movable end can make contact with and be electrically connected with the first conductive piece along with switching-on of the handle so that the electric leakage circuit board can be powered on and can be separated from the first conductive piece along with switching-off of the handle so that the electric leakage circuit board can be powered off. The electricity taking structure of the electric leakage circuit breaker can effectively disconnect the electric leakage loop under the condition of reverse wiring of the electric leakage circuit breaker, effectively reduces the failure risk of the electric leakage circuit breaker, and is simple in structure, low in cost and high in working reliability.

The application discloses a 48V EMB system with double-redundancy control and anti-reverse connection protection and relates to the field of vehicle braking, which alleviates the problems that the MCU cannot be reset, the motor brake is locked and the circuit is easily burnt when the battery is reversely connected in the existing 48V EMB system under abnormal conditions. The 48V EMB system comprises an MCU module, a motor pre-driving chip, an SBC module and a battery anti-reverse connection module; the SBC module is used for reset redundancy of the MCU module and motor pre-driving chip enable redundancy; the battery anti-reverse connection module is used for detecting a power supply connection, and when the power supply is forwardly connected, the power supply is controlled to form a loop, and otherwise the power supply loop is turned off. The application is suitable for a 48V mild hybrid drive-by-wire electronic mechanical brake caliper actuator, a 48V vehicle-mounted DC / DC converter power supply input module, a 48V electronic power steering controller power supply end and a 48V battery pack high-voltage power distribution box (PDU) / safety box power supply inlet.

The utility model discloses an anti-reverse-connection circuit, and the circuit comprises wiring terminals which comprise a positive wiring terminal and a negative wiring terminal; the positive electrode end of the photoelectric coupler is electrically connected with the positive electrode terminal, and the negative electrode end of the photoelectric coupler is electrically connected with the negative electrode terminal; the input end of the post-stage circuit is electrically connected with the photoelectric coupler; and the bidirectional silicon controlled rectifier is arranged at a circuit connection point between the output end of the post-stage circuit and the photoelectric coupler, and the bidirectional silicon controlled rectifier is also electrically connected with the positive terminal. When the wiring is correct, the photoelectric coupler is opened to trigger the bidirectional silicon controlled rectifier, so that the bidirectional silicon controlled rectifier is conducted to supply power to a post-stage circuit, the power loss is reduced, and the heating value of the element can also be reduced; and when the wiring is reversely connected, as no current passes through the photoelectric coupler, the bidirectional silicon controlled rectifier cannot be opened and cannot supply power to a post-stage circuit, so that the effect of protecting the post-stage circuit is achieved.

A small night light circuit supporting 0V charging and battery reverse connection installation includes charging chip U1, battery BAT, delay circuit, charging battery polarity detection circuit, double MOS anti-backflow circuit and separate battery power supply anti-reverse connection circuit. The delay circuit is turned on when the TYPE interface is inserted, and the battery is pre-charged; the polarity detection circuit uses a low-power comparator to detect the voltage difference between the two ends of the battery. A 10mV voltage difference between the positive and negative phases can reverse the output. After pre-charging, the voltage difference of the battery increases, and the comparator output high level maintains the continuous work of the charging chip, realizing 0V battery wake-up and polarity recognition; the double MOS anti-backflow circuit is cut off when the TYPE is pulled out, preventing the battery voltage from backflowing to the charging chip; the separate battery power supply anti-reverse connection circuit uses a lithium battery protection chip RB302B to isolate the ground when the battery is reversed, making the battery invalid. The application realizes multiple goals of 0V battery wake-up, anti-reverse connection, anti-backflow and low power consumption, and has the advantages of high reliability and high safety.

The control circuit comprises a control chip U1, a 5V power supply chip U3, a pressure sensor U4, a programming port SL, a 12V power supply positive electrode input end VCC12V and a grounding end GND, the input end of the 5V power supply chip U3 is connected with the 12V power supply positive electrode input end VCC12V, and the 5V output end of the 5V power supply chip U3 is connected with a VDD pin of the control chip U1, a fourth pin of the programming port SL and a VDD pin of the pressure sensor U4; and an OUT pin of the pressure sensor U4 is connected with a pin 16 of an IO input port of the control chip U1. The vacuum pump control circuit can effectively solve the problems that when the positive electrode and the negative electrode of the power supply are reversely connected, the control circuit is easy to burn out and the service life is influenced because the reverse connection protection is not arranged in the conventional vacuum pump control circuit.

This invention discloses a reverse connection protection system and a reverse connection detection method. The reverse connection protection system includes: multiple DC / DC boost units connected between corresponding DC power supplies and a common DC bus; each DC / DC boost unit includes an inductor L, a boost diode D, and a main switch Q; wherein the inductor L and the boost diode D are connected in series between the positive output terminal of the DC power supply and the positive bus, and the main switch Q is connected in parallel with the DC power supply and located between the inductor L and the boost diode D; multiple reverse connection protection units are connected in parallel with the corresponding main switch Q and located between the inductor L and the boost diode D; the multiple reverse connection protection units include at least one enhanced protection unit, including a first branch and a second branch connected in parallel; the first branch is configured to allow current to flow from the negative bus to the positive bus, and when the second branch is turned on, it is configured to allow current to flow between the negative bus and the positive bus, for detecting current characteristics.

The embodiment of the application provides a reverse connection prevention pre-charging system, a controller and a control method of an electric compressor, which comprise: a power supply circuit composed of a positive line and a negative line; a reverse connection prevention diode and a reverse connection prevention pre-charging negative connection end arranged in the negative line; the reverse connection prevention pre-charging negative connection end is connected with a power supply negative pole; the reverse connection prevention diode can be configured to prevent reverse connection of a power supply and block reverse current from flowing from the reverse connection prevention pre-charging negative connection end to the positive line. The application relates to the field of electric compressors. The reverse connection prevention diode is arranged in the negative line, and when the power supply is reversely connected, the reverse connection prevention diode can reliably block reverse current from flowing from the reverse connection prevention pre-charging negative connection end to the positive line, so that the circuit is protected from damage and the safety and reliability of the system are improved.