A vehicle power supply circuit including a power source input for receiving an input current having an input voltage is disclosed. A first branch and a second branch are each connected to the power source input. Each branch includes a converter for converting the input current to an output current. A first distribution unit is connected to each converter for receiving the output current and includes a plurality of first outputs for supplying power to a plurality of loads.

A backup power-supply device including a control unit is provided. In a case where a main power supply is normal when an ignition is turned on, the control unit controls to turn on or off a charging circuit to charge a capacitor from the main power supply so that a voltage of the capacitor becomes constant at a target voltage and turns off the discharging circuit to stop discharging from the capacitor to a first electronic device. In a case where an abnormality occurs in the main power supply when the ignition is turned on, the control unit turns off the charging circuit to stop charging from the main power supply to the capacitor and turns on the discharging circuit to perform discharging from the capacitor to the first electronic device.

Disclosed herein are a vehicle or other system battery with a self-contained backup capability and a method for providing power to a vehicle using the vehicle or other system battery with a self-contained backup capability. In one aspect, the vehicle battery comprises, a main battery portion, a backup battery portion, and a control device for selectively communicating a transfer of energy from the backup battery portion to the main battery portion when a voltage level or other health indicator of the main battery portion is determined to be below a reference voltage threshold, wherein the main battery portion and backup battery portion are each re-chargeable via an alternator of the vehicle when the control device communicates the transfer of energy between the main battery portion and the backup battery portion.

A portable or handheld device or apparatus for jump starting a vehicle engine having a depleted or discharged starting battery. The portable or handheld device or apparatus for jump starting a vehicle engine includes a rechargeable lithium-ion (Li-ion) battery pack and a battery cell equalization circuit configured to prevent overcharging of one or more individual lithium-ion battery cells, which can cause fire, damage to the battery pack and device or apparatus for jump starting a vehicle, or personal injury to a user.

Devices, systems, and methods for constant and reliable power distribution, using a redundant power bridge battery architecture, in autonomous vehicles are described. An example method includes determining that each of a plurality of sensors is operating within in a nominal range for the respective sensor, and distributing, based on the determining, power from at least one alternating current (AC) power source or at least one direct current (DC) power source to at least one power distribution unit (PDU), wherein a first power bridge is coupled to the at least one AC power source and the at least one DC power source and a second power bridge is coupled to the at least one DC power source and the at least one PDU, and wherein the plurality of sensors is used to monitor a health of the vehicle and any single point failure is detectable.

A driving apparatus drives a load. An N-channel MOSFET is disposed downstream of the load on a current path of a current that flows via the load. A circuit resistor is connected between a direct current power source and the gate of the MOSFET. A first switch is connected between the gate and the source of the MOSFET. A microcomputer outputs a voltage relative to a potential at an output terminal of a second switch to a control terminal of the second switch. As a result, the second switch is turned ON or OFF. A switching circuit turns the first switch ON when the second switch is turned ON and turns the first switch OFF when the second switch is turned OFF.

A jump starter device can include sensors to measure data of a vehicle coupled to the jump starter device. The jump starter device can include a controller configured to process the load data to determine the status of the load, such as the conditions of the vehicle connected to the jump starter.

A protection circuit 60 is provided with: switches 61, 62 positioned on a power line PL of an electricity storage element 22 and a load 12; first protection elements 63, 64, 65 connected in parallel with the switches 61, 62 and absorbing surge caused when the switches 61, 62 open and cut off discharge current; and a second protection element 66 connected in parallel with the load and flowing, back to the load, the surge caused when the switches 61, 62 open and cut off the discharge current.

A load is detachably connected to a device connector of a switch device. A resistance value of a switch circuit when a sub-switch is ON is greater than an ON resistance value of a main switch. A microcomputer acquires node voltage information indicating a node voltage of a connection node located downstream of the main switch and the sub-switch from a voltage detection unit in a state where the main switch is OFF and the sub-switch is ON. The microcomputer determines whether a switch current that flows via the main switch when the main switch turns ON will be less than a current threshold value, based on the acquired node voltage information.

A charge-discharge control circuit, method, device and a storage medium are provided. In some embodiments, the circuit includes: a starting power supply; and a main positive switch unit. In those embodiments, a first terminal of the main positive switch unit is connected to the starting power supply, and a second terminal of the main positive switch unit is connected to a generator of the vehicle and a load of the vehicle. The main positive switch unit is configured to interrupt a current in a first current direction, which is a current direction when the generator charges the starting power supply. The circuit also includes a battery management module configured to detect a voltage of the starting power supply, and control the main positive switch unit to interrupt the current in the first current direction when the voltage of the starting power supply reaches a preset voltage threshold.