A three-phase synchronous rectifier for charging a battery on board the vehicle, comprising a first and a second input which are independent of each other and each connectable to a respective first and second three-phase output branch of a generator, two independent negative and positive outputs each connectable to the respective poles of the battery, a first group of three rectification units configured to be connected to the first output branch of the generator via said first input, a second group of three rectification units configured to be connected to the second output branch of said generator via the second input. Advantageously, the rectification units are configured to be simultaneously connected to the battery of the vehicle.

The present application relates to a power supply device and a power supply method for providing electric energy to a target system. The power supply device includes: a first controller which is configured to receive an external signal or instruction, and to generate a power supply control signal; and a first option switch which is configured to receive the power supply control signal, and to establish a connection between at least one energy storage module and the target system in order to selectively output electric energy to the target system with one or more predetermined voltage; wherein when the electric energy to be output by the power supply device is a first predetermined voltage, a first energy storage module of the at least one energy storage module is connected with the target system.

An off-road vehicle includes a vehicle body, a power system, electrical devices, an electricity storage bank, a generator, and an electric power regulator. The electric power regulator is used to regulate the voltage output from the generator to the electricity storage bank and corresponds to the electricity storage bank. The electric power regulator includes a voltage regulating chip, a switch circuit and voltage stabilizing circuit. The electric power regulator is capable of regulating the voltage output from the generator to the electricity storage bank according to the nominal voltage of the electricity storage bank, and the output voltage of the electric power regulator is greater than the bank voltage.

An apparatus for jump starting a vehicle is disclosed. The apparatus comprises: a first and a second ignition clamp, a sampling circuit configured to sample polarity output signal from the vehicle battery when each of the first and the second ignition clamps is connected to a respective one of the first and the second terminals of the vehicle battery, a polarity determining circuit configured to determine, based on the sampled polarity output signal, a polarity of the first and the second terminal of the vehicle battery, and a clamp polarity switching circuit configured to connect the first and the second ignition clamps to a portable power supply, and enable, in response to the determined respective polarities of the first and the second terminals of the vehicle battery, a polarity on the first and on the second ignition clamps to be the same as that of the corresponding terminal connected thereto.

Motor vehicle is provided with a first onboard power supply with a first voltage source which provides a first onboard power supply voltage and with a second onboard power supply with a second voltage source which provides a second onboard power supply voltage different from the first onboard power supply voltage, wherein the two onboard power supply voltages are direct-current voltages, wherein at least one power supply isolating device connects a connection point of the first onboard power supply and a connection point of the second onboard power supply, wherein the power supply isolating device includes at least one semiconductor device, wherein the power supply isolating device has a reverse direction and a forward direction, and wherein the forward direction of the power supply isolating device is directed from the first onboard power supply into the second onboard power supply.

Motor vehicle on-board electrical network switch having at least two inputs for a respective one of at least two on-board power supplies, at least one output for a load of the motor vehicle, at least two switches, a first switch being disposed between a first of the inputs and a common node, and a second switch being disposed between a second of the inputs and the common node, and the output being electrically connected to the common node, wherein the switches are formed as semiconductor switches and are respectively connected with their body diodes in forward direction towards the common node, characterized in that a monitoring circuit monitors a first voltage at the first input and/or a second voltage at the second input and/or a voltage at the common node, and in that the monitoring circuit causes an opening signal for simultaneous opening of both switches depending on an amount of at least one of the monitored voltages.

A back-up power supply system (1) is configured to supply electric power from an electric storage device (5) to loads (3) when a power supply (2) is defective. The back-up power supply system (1) includes a first voltage conversion circuit (6) configured to convert an output voltage of the electric storage device (5). The loads (3) include a first load (31) and a second load (32). The back-up power supply system (1) is configured to supply power from the electric storage device (5) to the first load (31) not via the voltage conversion circuit (6), and to supply electric power from the electric storage device (5) to the second load (32) via the voltage conversion circuit (6).

A power supply control device includes: a first system configured to supply electric power from a first power supply to a first load group; a second system configured to supply electric power from a second power supply to a second load group; a plurality of load switches configured to switch an electric power supply to each load of the first load group and the second load group; and a control unit configured to control the plurality of load switches such that electric power is supplied from the second power supply to a backup load included in at least one of the first load group and the second load group in a predetermined backup state, wherein the control unit detects a state of charge of the second power supply, and increases, in the predetermined backup state, number of the load switches to be connected as the state of charge is higher.

A power conversion system includes a transformer, a power conversion device for travel, a power conversion device for auxiliary power sources, an electrical storage device, and an auxiliary device. The power conversion device for travel converts AC power into power for travel and supplies it to a travel motor. The power conversion device for auxiliary power sources includes an AC to DC conversion unit which converts AC power into DC power, a power conversion unit for AC loads which converts the DC power into AC power and supplies it to an AC load, and a power conversion unit for DC loads which converts DC power to DC power and supplies it to a DC load. The electrical storage device is connected to power lines connecting DC power output terminals of the AC to DC conversion unit and DC power input terminals of both the power conversion units for AC and DC loads. The auxiliary device is connected to power lines connecting the power conversion device for auxiliary power sources and the electrical storage device and operates with power supplied from the electrical storage device.

A voltage conversion apparatus includes connection terminals to which a battery, a capacitor, and a protected load are respectively connected, a first DC-DC converter having input/output terminals, a second DC-DC converter having input/output terminals, a first power path having one end connected to the first connection terminal and the other end connected to the first input/output terminal, a second power path having one end connected to the second input/output terminal and the other end connected to the third input/output terminal, a third power path having one end connected to the fourth input/output terminal and the other end connected to the second connection terminal, and a fourth power path having one end connected to a midway part of the second power path and the other end connected to the third connection terminal.