Abstract: This application provides a control circuit apparatus of a battery system and a battery management system, and is applied to the field of battery equalization technologies. The control circuit apparatus in this application includes a switch matrix network unit, a first equalization unit, and a second equalization unit. The switch matrix network unit is configured to: form a loop between m battery units in the battery system and the first equalization unit, and form a loop between the m battery units in the battery system and the second equalization unit. The first equalization unit discharges a high-voltage battery unit through a resistor unit, and the second equalization unit charges a low-voltage battery unit through a transformer.

Abstract: A fault detection method for a three-phase power distribution system, which includes three phase lines and a neutral line. The three phase lines intersect with the neutral line at a neutral point, the three phase lines include a first phase line, a second phase line, and a third phase line, and at least one of the three phase lines is connected to the neutral line. The method includes: obtaining a voltage between every two phase lines; obtaining a voltage between each phase line and the neutral point based on the voltage between every two phase lines; obtaining a voltage between the neutral line and the neutral point based on a voltage between each phase line and the neutral line and the voltage between each phase line and the neutral point; and detecting the voltage between the neutral line and the neutral point, whether a fault occurs in the neutral line.

Abstract: An on-board distributed power supply system is coupled to an on-board distributed drive system. The on-board distributed drive system includes at least two power trains, and the on-board distributed power supply system includes at least two low-voltage battery pack groups. Each low-voltage battery pack group of the at least two low-voltage battery pack groups includes at least one low-voltage battery pack. Each low-voltage battery pack of the at least one low-voltage battery pack includes a plurality of battery cells. Each low-voltage battery pack group of the at least two low-voltage battery pack groups is correspondingly electrically connected to at least one of the power trains in the on-board distributed drive system, and is configured to provide electric energy for each power train of the at least two power trains in the on-board distributed drive system.

Abstract: A photovoltaic power generation system includes a capacitor bridge arm, an inverter bridge arm, and the fault protection apparatus. The capacitor bridge arm includes a positive electrode output port, a negative electrode output port, and a reference output port The inverter bridge arm includes a positive electrode input port, a negative electrode input port, and a reference input port. The positive electrode input port is connected to the positive electrode output port. The negative electrode input port is connected to the negative electrode output port. The reference input port is connected to the reference output port by using the fault protection apparatus. The fault protection apparatus is turned off based on a magnitude value or a variation of a voltage, or a magnitude value or a variation of a current between the reference input port and the positive electrode input port or the negative electrode input port.

Abstract: An inverter apparatus is disclosed in this application, which includes a plurality of protection units and a plurality of inverter units. For any protection unit, when a voltage at an input terminal of the protection unit is greater than a voltage at an output terminal of the protection unit, a path between the input terminal and the output terminal of the protection unit is in a forward conducted state; when the voltage at the output terminal of the protection unit is greater than the voltage at the input terminal voltage of the protection unit, the path between the input terminal and the output terminal of the protection unit is in a reverse cut-off state; and when a control terminal of the protection unit receives a first trigger signal, the path between the input terminal and the output terminal of the protection unit is in a reverse conducted state.

Abstract: A motor shaft, a motor, and an electric vehicle. The motor shaft includes a shaft body and an insulation coating. The shaft body includes a first mounting portion and a second mounting portion that are connected by fastening. A positioning step surface is disposed at an end that is of the first mounting portion and that is close to the second mounting portion. The first mounting portion is configured to mount a rotor. The second mounting portion is covered with the insulation coating, and the second mounting portion is configured to mount a bearing. A resistivity of the insulation coating is not less than 107 ?·m. In this way, a possibility that a shaft current is generated when a shaft voltage discharges and breaks down a lubricating oil film in the bearing to form a path can be effectively reduced.

Abstract: This application relates to the field of wireless charging technologies. The wireless charging transmitting apparatus includes a transmit antenna array and a first controller. The wireless charging receiving apparatus includes a power receiving antenna and a second controller. When receiving a charging request signal, the first controller controls the transmit antenna array to successively switch to each polarization state to transmit a power signal. The second controller sends feedback information indicating a magnitude of energy obtained from the power signal. The first controller determines an optimal polarization state based on the feedback information, so that the transmit antenna array transmits a power signal in the optimal polarization state.

Abstract: A drive apparatus and an electric vehicle are provided to implement fault monitoring functions of two control chips when one watchdog chip is configured. The drive apparatus includes a first control chip, a second control chip, a first drive circuit, a second drive circuit, a watchdog chip, and a reset shutdown circuit. The first drive circuit generates a drive signal of a first inverter. The second drive circuit generates a drive signal of a second inverter. The first control chip and the second control chip perform fault monitoring on each other.

Abstract: A controller for controlling a phase-shifted full-bridge circuit, a power supply module, and an electronic device. The phase-shifted full-bridge circuit includes a first leg and a second leg. A working state of the phase-shifted full-bridge circuit includes a first working state and a second working state. The controller is configured to: detect a load level of a load circuit coupled to the phase-shifted full-bridge circuit, and control, based on the load level, the phase-shifted full-bridge circuit to switch the running working state. When the phase-shifted full-bridge circuit runs in the first working state, the first leg is a leading leg, and the second leg is a lagging leg. When the phase-shifted full-bridge circuit runs in the second working state, the first leg is a lagging leg, and the second leg is a leading leg.

Abstract: This application relates to a motor controller applied to an electric vehicle, a microprocessor in the motor controller, and a sampling trigger method applied to the microprocessor. The sampling trigger method includes: a signal generation module generates an exciting fundamental wave signal to drive the resolver to work; a signal processing module determines an exciting symbol based on the exciting fundamental wave signal, where the exciting symbol includes alternate high-level signals and low-level signals, and the signal processing module further determines a zero crossing point signal of the exciting fundamental wave signal based on the exciting symbol; and a phase shift processing module performs phase shift processing on the zero crossing point signal to obtain a sampling trigger signal, to trigger the microprocessor to sample the resolver feedback signal. In this solution, fewer peripheral circuits of a chip are used, thereby improving a product integration degree.

Abstract: This application discloses a charging pile and a charging pile control method. The method includes: obtaining a first temperature of at least one charging apparatus that is in a first state and that is in a charging pile; obtaining a second temperature of at least one charging apparatus that is in a second state and that is in the charging pile, where the second state is a sleep state; calculating a temperature difference between the second temperature and the first temperature; determining whether the temperature difference is greater than a first threshold, where the first threshold is an upper-limit temperature of the temperature difference; and when the temperature difference is greater than the first threshold, starting a heat dissipation fan of the charging apparatus that is in the second state.

Abstract: An insulation impedance detection method includes: An inverter injects a first common-mode voltage into an alternating current side, where the first common-mode voltage is divided by an alternating current grounding insulation impedance of an alternating current cable and a direct current grounding insulation impedance of a photovoltaic unit. The inverter can obtain an impedance value of the alternating current grounding insulation impedance based on the first common-mode voltage, a voltage divided by the alternating current grounding insulation impedance for the first common-mode voltage (a second common-mode voltage on the alternating current grounding insulation impedance), and an impedance value of the direct current grounding insulation impedance. The alternating current grounding insulation impedance is detected by using a necessary device, namely, the inverter in a photovoltaic power generation system.

Abstract: A battery and an energy storage system. The battery includes a battery housing, at least two cells (for example, a first cell and a second cell), a temperature detection board, and a temperature sensor. The first cell and the second cell are disposed in the battery housing. The temperature detection board is disposed between the first cell and the second cell, and a board body of the temperature detection board is provided with an accommodation space. The temperature sensor is placed in the accommodation space, and the temperature sensor can sense an internal temperature of the battery.

Abstract: A first input end of a first inverter is connected to a second end of a direct current positive bus, and a second input end of the first inverter is connected to a second end of a neutral bus. A first input end of a second inverter is connected to the second end of the neutral bus, and a second input end of the second inverter is connected to a second end of a direct current negative bus. A controller is configured to control, in startup and shutdown processes, a voltage to ground of the direct current positive bus, a voltage to ground of the direct current negative bus, and a voltage to ground of the neutral bus each to be less than or equal to a preset voltage threshold, to ensure personal safety and device safety.

Abstract: An energy storage system is provided, where the energy storage system may include an energy storage module and a power conversion module. The energy storage module may be configured to generate a target waveform signal on the direct current bus when receiving a black start signal. In this case, the power conversion module may be configured to: detect the target waveform signal on the direct current bus, and turn on based on the target waveform signal. When the power conversion module cannot receive a power-on instruction of an energy management system, the power conversion module may also actively turn on when detecting the target waveform signal on the direct current bus, to implement a black startup. This features low costs and higher applicability.

Abstract: A power adapter includes a housing, a circuit board component, and a heat dissipation air duct. The housing has an air inlet and an air outlet, the circuit board component is located inside the housing, the heat dissipation air duct is located in the housing and/or a spacing area between the housing and the circuit board component, the heat dissipation air duct surrounds the circuit board component and is connected to the air inlet and the air outlet, and the heat dissipation air duct is configured to dissipate heat from the housing and/or the circuit board component.

Abstract: A gear shifting apparatus in a new energy vehicle includes a primary power transmission unit, a secondary power transmission unit, an intermediate shaft, an intermediate shaft gear, a first clutch unit, a second clutch unit, and a third clutch unit. The intermediate shaft gear is fixedly sleeved on the intermediate shaft, and the first clutch unit is disposed between the intermediate shaft and the primary power transmission unit. The second clutch unit is disposed between the intermediate shaft and the secondary power transmission unit. The third clutch unit is disposed between the primary power transmission unit and the intermediate shaft gear.

Abstract: This application discloses a method, an apparatus, and a system for obtaining electronic layout applied to photovoltaic array in the field of equipment installation management. According to the method, the electronic device identifies each first area in a target picture to obtain position information and a module identifier of at least one photovoltaic module in each first area, and may directly obtain an electronic layout based on the position information and the module identifier of each photovoltaic module. In this way, a product identifier of each converter does not need to be manually obtained, and a photovoltaic module does not need to be manually added to the electronic layout. This reduces labor time consumption and improves efficiency of obtaining the electronic layout.

Abstract: An input end of each DC-DC conversion circuit in the photovoltaic system is connected to a corresponding photovoltaic string. Output ends of a plurality of DC-DC conversion circuits are connected in parallel to an input end of a DC-AC conversion circuit. A controller performs a partial IV curve scan on each of the DC-DC conversion circuits, and in a scanning process, controls a total input power of the plurality of DC-DC conversion circuits to be consistent with that existing before the scan; and obtains a sum of the maximum input powers of all the DC-DC conversion circuits based on the maximum input power of each of the DC-DC conversion circuits, where a scanned voltage of the partial IV curve scan is less than an open-circuit voltage. The partial IV curve improves scanning efficiency and obtains a maximum input power in a power-limited state, facilitating subsequent power dispatch and control.

Abstract: A device for resolving common-mode voltage interference is applied to a power supply system including a power converter and a switch mechanism. Each phase of an output end of the power converter is connected to a downstream circuit by using the switch mechanism. The switch mechanism includes a first switch and a second switch. The device includes a controller and a passive component. Two ends of the first switch in at least one phase of the output end of the power converter are connected in parallel to the passive component, and the controller controls the second switch to be turned on, and when a voltage difference between the two ends of the first switch is less than a preset voltage, controls the first switch to be turned on. In this manner, the switch mechanism is protected, thereby prolonging a service life of the switch mechanism.