The problem to be overcome by the present disclosure is to reduce waste of an electrical storage unit. A backup power supply system (1) includes an electrical storage unit (2) and a control unit (3). The electrical storage unit (2) supplies electric power to a load (4) according to an electrical characteristic of a main power supply (5). The main power supply (5) supplies electric power to the load (4). The control unit (3) controls the supply of the electric power from the main power supply (5) and the electrical storage unit (2) to the load (4). The load (4) includes a first load (41) and a second load (42). When the electrical characteristic of the main power supply (5) is equal to or greater than a first threshold value (Vth1), the control unit (3) performs control to have both the first load (41) and the second load (42) supplied with the electric power from the main power supply (5). When the electrical characteristic of the main power supply (5) is less than the first threshold value (Vth1), the control unit (3) performs control to have the second load (42) supplied with the electric power from the main power supply (5) and have the first load (41) supplied with the electric power from the electrical storage unit (2).

A plurality of systems of power supply circuits are provided between a power source and a load and are capable of cooperatively supplying power to the load using power of the power sources. In the power supply circuits, ground lines connected to a negative pole of the power source are configured independently for each system. A plurality of ground current detectors detect ground currents that are currents flowing through the ground lines of each system. The control units have ground line diagnosis portions that diagnose an abnormality in the ground lines based on the ground currents. When the ground line diagnosis portions determine that at least one system ground line is abnormal, the control units change the operation of the power supply circuit of the system determined to be abnormal.

A low-voltage system of a transport refrigeration unit (TRU) includes a low-voltage direct current (LVDC) source; and a distribution bus coupled to the LVDC, the distribution bus is coupled to a compressor, at least one condenser, and at least one evaporator.

An auxiliary battery system of a vehicle and a method of using the same include an auxiliary battery, a switching module, and an auxiliary battery control module, and the auxiliary battery stores power used in a plurality of loads of the vehicle, and configured to provide the power to a first load and a second load among the plurality of loads in a state in which the vehicle is parked, the switching module is electrically connected between the auxiliary battery and the first load, and the auxiliary battery control module is configured to determine whether a vehicle communication network enters a sleep mode in the state where a vehicle is parked, turn on a switching module when it is determined that the vehicle communication network has not entered the sleep mode, and turn off the switching module when a predetermined time period has elapsed after it is determined that the vehicle communication network has entered the sleep mode.

Disclosed are a voltage regulation circuit, a power supply module, a vehicle, and a control method. The voltage regulation circuit includes a first NMOS transistor, a second NMOS transistor, a third NMOS transistor, a control chip and an inductor; and an output terminal of the control chip is electrically connected to a gate electrode of the first NMOS transistor, a gate electrode of the second NMOS transistor, and a gate electrode of the third NMOS transistor, respectively; where a source electrode of the first NMOS transistor is electrically connected to a second terminal of the inductor. According to the technical solution of the present disclosure, at least a problem of a poor voltage regulation effect of an existing transformer may be solved.

The invention relates to an automotive power supply system (1) for transforming battery voltages ranging between 6 V and 16 V DC into DC voltages ranging between 3 V and 12 V, in particular between 3,3 V and 12 V, said automotive power supply system (1) comprising an input (2) for receiving voltage of a battery (3), said voltage of the battery (3) being referred to as first voltage (U1), a first buck converter (4) for receiving the first voltage (U1) via the input (2) and, if said first voltage (U1) is at least 12 V, for converting it down to a second voltage (U2), a boost converter (7) that is connected with the input (2) and configured to convert the first voltage (U1) into a third voltage (U3) that is higher than the first voltage (U1, and a multi-phase-dc-dc converter (5) having at least two channels (5a, 5b), said multi-phase-dc-dc converter (5) being configured to activate and deactivate its channels independently of another.