Abstract: A backup power supply system of the present invention includes a first auxiliary power supply and a second auxiliary power supply capable of supplying electric power to a first load when failure of a main power supply occurs. In the backup power supply system, a second duration is shorter than a first duration. The first duration is the duration until the first auxiliary power supply becomes capable of supplying electric power to the first load. The second duration is the duration until the second auxiliary power supply becomes capable of supplying electric power to the first load.

Abstract: An auxiliary power supply system includes a plurality of electrical storage devices that supply power to an electrical device. Each of the storage devices has the communication capability with the electrical device. Each of the storage devices provisionally selects one of a plurality of first communication addresses as a provisional communication address of its own. The plurality of first communication addresses have been set for the plurality of electrical storage devices by the electrical device. Each of the storage devices returns a response signal in reply to a transmission signal, to which the provisional communication address of its own is added. Each of the storage devices changes, when finding that any communication error has occurred while returning the response signal, the provisional communication address of its own into one of one or more unused communication addresses belonging to the plurality of first communication addresses that have been set.

Abstract: The electricity storage device control circuit includes a voltage detector and a voltage controller. The voltage detector is configured to detect voltages of a plurality of electricity storage devices. The voltage controller is configured to individually control the voltages of the plurality of electricity storage devices by performing, based on a detection result by the voltage detector, at least one of discharging or charging of electrostatic energy stored in the plurality of electricity storage devices.

Abstract: A backup power-supply system according to the present invention includes a detector, a power storage unit, and a controller. The detector is configured to detect an abnormality of a power supply that supplies electric power to loads. The power storage unit is configured to supply electric power to the loads when the detector detects the abnormality of the power supply. The controller is configured to monitor a remaining electric energy remaining in the power storage unit, and impose, when the remaining electric energy of the power storage unit is smaller than a threshold electric energy, a limitation on the loads to which the power storage unit supplies the electric power.

Abstract: A backup power supply system supplies power to one or more loads in a situation where a power supply has caused a failure. The backup power supply system includes a plurality of power storage devices and a switching unit. The plurality of power storage devices are charged by the power supply. The switching unit switches electrical connection between the plurality of power storage devices to either a first state where the plurality of power storage devices are connected to the power supply in parallel or a second state where the plurality of power storage devices are connected to each other in series. The switching unit switches the electrical connection to the first state while the plurality of power storage devices are being charged and switches the electrical connection to the second state when the power supply has caused the failure.

Abstract: 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).

Abstract: A backup power supply system of the present invention includes a first auxiliary power supply and a second auxiliary power supply capable of supplying electric power to a first load when failure of a main power supply occurs. In the backup power supply system, a second duration is shorter than a first duration. The first duration is the duration until the first auxiliary power supply becomes capable of supplying electric power to the first load. The second duration is the duration until the second auxiliary power supply becomes capable of supplying electric power to the first load.

Abstract: A vehicle electricity storage device includes a capacitor unit for supplying stored electric power to an electronically controlled system, and a microcomputer including a memory. The memory stores a plurality of thresholds (internal resistance limit values) different from each other. Each of the plurality of thresholds is to be compared with an electrical characteristic value (internal resistance value) related to the capacitor unit for determining a deterioration state of the capacitor unit. The each of the plurality of thresholds is stored in association with an identification ID for identifying the electronically controlled system. The microcomputer acquires the identification ID from the electronically controlled system. And the microcomputer selects, from the plurality of thresholds, a threshold associated with the identification ID acquired. Then the microcomputer determines the deterioration state of the capacitor unit by using the electrical characteristic value and the threshold selected.

Abstract: A method for controlling a discharge of a power storage device includes: a first step of discharging, in a first section of a discharging period, a part of an electric charge stored in a power storage through a first discharge path and a second discharge path of a discharge circuit; and a second step of discharging, in a second section of the discharging period, a remaining part of the electric charge through the second discharge path. The first discharge path includes a zener diode connected to one end of the power storage. The second discharge path includes a first transistor connected to the one end of the power storage. The first section is a period in which a voltage of the one end of the power storage is higher than a breakdown voltage of the zener diode. The second section is a period in which a voltage of the one end of the power storage is lower than the breakdown voltage of the zener diode.

Abstract: A backup power-supply system according to the present invention includes a detector, a power storage unit, and a controller. The detector is configured to detect an abnormality of a power supply that supplies electric power to loads. The power storage unit is configured to supply electric power to the loads when the detector detects the abnormality of the power supply. The controller is configured to monitor a remaining electric energy remaining in the power storage unit, and impose, when the remaining electric energy of the power storage unit is smaller than a threshold electric energy, a limitation on the loads to which the power storage unit supplies the electric power.

Abstract: A discharge circuit includes a plurality of burden circuits that are electrically connected in parallel to a plurality of power storage units, respectively. Each of the plurality of burden circuits includes (i) a resistor and a switch that are electrically connected in series between both ends of a corresponding one of the plurality of power storage units, and (ii) a control terminal that controls the switch according to a potential of the control terminal. The plurality of burden circuits are electrically connected in series between a positive electrode and a negative electrode. The control terminal of a n+1-th burden circuit from a reference point is electrically connected, via the switch of the n-th burden circuit from the reference point, to a reference point side terminal of a n-th power storage unit from the reference point. The reference point is the positive electrode or the negative electrode.

Abstract: The present disclosure relates to a vehicle electricity storage device capable of maintaining proper backup of a main power supply. The vehicle electricity storage device includes an electricity storage circuit, a main charge circuit, and a precharge circuit. The electricity storage circuit configured to supply stored electricity to a load. The main charge circuit operates to supply electricity of a main power supply to the electricity storage circuit when an ignition switch is in an ON state of allowing an engine to start. The precharge circuit operates to supply electricity of the main power supply to the electricity storage circuit when the main charge circuit is in a state of stopping operation by the ignition switch being turned off.

Abstract: A power storage device includes an input terminal, an output terminal, a first circuit, and a second circuit. The input terminal is to be electrically connected to a power supply. The output terminal is to be electrically connected to a load. The first circuit and the second circuit are electrically connected in parallel. Each of the first circuit and the second circuit are disposed between the input terminal and the output terminal. The first circuit includes a power storage unit and a discharge path that allows a discharge current from the power storage unit to flow toward the output terminal. The second circuit includes a blocking path that prevents the discharge current from flowing toward the input terminal.

Abstract: A method for controlling a discharge of a power storage device includes: a first step of discharging, in a first section of a discharging period, a part of an electric charge stored in a power storage through a first discharge path and a second discharge path of a discharge circuit; and a second step of discharging, in a second section of the discharging period, a remaining part of the electric charge through the second discharge path. The first discharge path includes a zener diode connected to one end of the power storage. The second discharge path includes a first transistor connected to the one end of the power storage. The first section is a period in which a voltage of the one end of the power storage is higher than a breakdown voltage of the zener diode. The second section is a period in which a voltage of the one end of the power storage is lower than the breakdown voltage of the zener diode.

Abstract: A discharge circuit includes a plurality of burden circuits that are electrically connected in parallel to a plurality of power storage units, respectively. Each of the plurality of burden circuits includes (i) a resistor and a switch that are electrically connected in series between both ends of a corresponding one of the plurality of power storage units, and (ii) a control terminal that controls the switch according to a potential of the control terminal. The plurality of burden circuits are electrically connected in series between a positive electrode and a negative electrode. The control terminal of a n+1-th burden circuit from a reference point is electrically connected, via the switch of the n-th burden circuit from the reference point, to a reference point side terminal of a n-th power storage unit from the reference point. The reference point is the positive electrode or the negative electrode.

Abstract: A discharge circuit includes: a first transistor connected to power storage; an operational amplifier for controlling an output current of the first transistor; and the current mirror circuit connected to the operational amplifier. The current mirror circuit includes a second transistor connected to a non-inverting input terminal of the operational amplifier, and a third transistor connected to the power storage.

Abstract: A power storage device includes an input terminal, an output terminal, a first circuit, and a second circuit. The input terminal is to be electrically connected to a power supply. The output terminal is to be electrically connected to a load. The first circuit and the second circuit are electrically connected in parallel. Each of the first circuit and the second circuit are disposed between the input terminal and the output terminal. The first circuit includes a power storage unit and a discharge path that allows a discharge current from the power storage unit to flow toward the output terminal. The second circuit includes a blocking path that prevents the discharge current from flowing toward the input terminal.

Abstract: A vehicle electricity storage device includes a capacitor unit for supplying stored electric power to an electronically controlled system, and a microcomputer including a memory. The memory stores a plurality of thresholds (internal resistance limit values) different from each other. Each of the plurality of thresholds is to be compared with an electrical characteristic value (internal resistance value) related to the capacitor unit for determining a deterioration state of the capacitor unit. The each of the plurality of thresholds is stored in association with an identification ID for identifying the electronically controlled system. The microcomputer acquires the identification ID from the electronically controlled system. And the microcomputer selects, from the plurality of thresholds, a threshold associated with the identification ID acquired. Then the microcomputer determines the deterioration state of the capacitor unit by using the electrical characteristic value and the threshold selected.

Abstract: An electricity storage unit of the present disclosure includes: an electricity storage device; a holder for holding this electricity storage device; a case having a tubular side wall part and a bottom surface part closing one end of the side wall part, the case being formed with an opening at another end of the side wall part; and a cover for covering the opening. The electricity storage device and the holder are housed inside the case. At least a part of the cover is inserted inside the case. An aperture is formed at least part of a region between an outer periphery of the cover and an inner surface of the side wall part.

Abstract: The present disclosure relates to a vehicle electricity storage device capable of maintaining proper backup of a main power supply. The vehicle electricity storage device includes an electricity storage circuit, a main charge circuit, and a precharge circuit. The electricity storage circuit configured to supply stored electricity to a load. The main charge circuit operates to supply electricity of a main power supply to the electricity storage circuit when an ignition switch is in an ON state of allowing an engine to start. The precharge circuit operates to supply electricity of the main power supply to the electricity storage circuit when the main charge circuit is in a state of stopping operation by the ignition switch being turned off.