A bi-directional DC-DC converter and an on-board charger with the bi-directional DC-DC converter integrated into it are disclosed for converting a first voltage to a second voltage. The bi-directional DC-DC converter includes a transformer for magnetically coupling a primary circuit receiving the first voltage on a primary side with a rectification circuit on a secondary side. Further, a high voltage power source is connected to the rectification circuit for supplying a high voltage to one or more high voltage loads and a low voltage power source is connected to the high voltage power source through a secondary circuit for supplying a second voltage to one or more low voltage loads. The bi-directional DC-DC converter functions in both stationary condition and running condition of a powered device.

[Object] To provide a power control device capable of equalizing power between storage batteries in supplying direct-current power through three wires, that is, the positive electrode wire, the neutral wire, and the negative electrode wire. The storage batteries are connected in series between the positive electrode wire and the neutral wire and between the neutral wire and the negative electrode wire.

[Solution] The power control device including: a comparison unit configured to acquire a charging condition of a first battery and a charging condition of a second battery from the first battery and the second battery and to compare the charging conditions with each other, the first battery being provided between a positive electrode wire to which a positive potential is applied and a neutral wire to which a ground potential is applied, the second battery being provided between the neutral wire and a negative electrode wire to which a negative potential is applied; and a power control unit configured to control power interchange between the first battery and the second battery such that the charging condition of the first battery and the charging condition of the second battery are balanced against each other on the basis of a comparison result obtained by the comparison unit.

Provided is a vehicle control device comprising a plurality of constant voltage generation circuits, wherein a specified voltage is supplied to a load even if any one of the constant voltage generation circuits outputs a voltage that exceeds the specified voltage.

This vehicle control device is provided with a first and second constant voltage generation circuit that each output a voltage to a load, and when either the first or second constant voltage generation circuit outputs a voltage that exceeds a reference voltage, cuts off the output of that constant voltage generation circuit from the load.

Disclosed are a mixed battery group and battery grouping method. The mixed battery group forms a battery group via a serial connection between a primary power supply battery sub-group and an auxiliary power supply battery sub-group, wherein a unit voltage rated capacity of the auxiliary power supply battery sub-group is higher than that of the primary power supply battery sub-group. The mixed battery group provides an entire voltage output of a whole battery group to supply power outwards, and also provides one or more auxiliary power supply having a voltage lower than the entire voltage of the whole battery group to supply power outwards.

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.

A direct current power system. The direct current power system includes a direct current bus system, a solar power system, an energy storage system and a wind power system. The solar power system is configured to supply a first direct current power. The energy storage system has an input electrically coupled to the solar power system and is configured to supply a second direct current power at 380 volts to the direct current bus system. The wind power system includes is electrically coupled to the energy storage system and is configured to supply a third direct current power.

A power system, responsive to a detected change in an onboard charger or a generator, switches a converter from a first conversion setting, in which a first low voltage value of a medium-voltage bus port is converted to a first high voltage value of a high-voltage bus port, to a second conversion setting, in which a second low voltage value of the medium-voltage bus port is converted to the first high voltage value of the high-voltage bus port.

A power provider circuit includes a plurality of power delivery controllers, a single stage power supply, and control circuitry. Each of the plurality of power delivery controllers is configured to provide power to a detachable device. The single stage power supply is configured to generate the power for provision to the detachable devices, and to provide the power at a plurality of selectable voltages. The control circuitry configured to select a given voltage of the plurality of selectable voltages to be made available via all of the power delivery controllers based on power utilization capabilities and other optional status indications reported by the detachable devices.

An electrical system for connecting a rotary electric machine to dc networks operating at different voltages, the electric machine having polyphase winding sets each having a respective index. The electrical system has a first set of ac-dc converter circuits connected in a modular multilevel configuration, each ac-dc converter circuit having a respective index and an ac interface for connection with a corresponding winding set, and in which the modular multilevel configuration has dc outputs each having a respective index. The electrical system also has a set of dc-dc converter circuits each having a respective index and being configured to convert dc power between a voltage at a first dc interface and a voltage at a second dc interface, where a first dc interface of the nth dc-dc converter circuit is connected with the dc outputs of the modular multilevel configuration.

A vehicular battery control device controls an electric storage amount of a battery as which a lithium-ion battery is employed. The vehicular battery control device includes a control unit that reduces the electric storage amount of the battery until the electric storage amount of the battery assumes a second state, before the lapse of a first time, when the electric storage amount of the battery assumes a first state and it is predicted that a charge current will flow in the first time. The first state is a state where lithium metal is precipitated by charging the battery with a predetermined amount of electric power, and the second state is a state where no lithium metal is precipitated even when the charge current flows through the battery.