Panasonic Intellectual Property Management Co., Ltd.

Takashi Higashide

Youichi Kageyama

Katsunori Atago

Hisao Hiragi

Yugo Setsu

Kazuo Takenaka

Hiroki Nishinaka

Tsukasa Onodera

Shinichi Tanida

A power storage system includes a storage unit, a charging circuit configured to supply a charging current to the storage unit, and a controller connected to the storage unit. The storage unit includes plural capacitor elements connected in series to one another each having both ends, plural resistors connected to the capacitor elements, and plural switch elements connected to the capacitor elements and the resistors. One of both ends of each capacitor element of the plural capacitor elements is connected to one end of a corresponding resistor of the plural resistors. Another of the both ends of the each capacitor element is connected to one end of a corresponding switch element of the plural switch elements. Another end of the corresponding resistor is connected to another end of the corresponding switch element. The corresponding switch element is configured to selectively switch between a connected state in which the one end of the corresponding switch element is connected to the another end of the corresponding switch element and a disconnected state in which the one end of the corresponding switch element is disconnected from the another end of the corresponding switch element. While the charging circuit supplies the charging current to the storage unit, the controller is configure to perform the following operation. The controller causes the corresponding switch element to be in the disconnected state when a difference between the storage voltage of the each capacitor element and the reference voltage is equal to or larger than a predetermined first voltage difference value. The reference voltage increases as the each capacitor element is charged. The controller causes the corresponding switch element to be in the connected state when the difference between the storage voltage of the each capacitor element and the reference voltage is larger than the predetermined first voltage difference value, and then, switches the corresponding switch element from the connected state to the disconnected state when the difference between the storage voltage of the each capacitor element and the reference voltage becomes smaller than a predetermined second voltage difference value.

Energy storage system

A backup power system according to the present disclosure includes a battery, a charging circuit, power storage, a first load, a second load, and a controller that controls the charging circuit. The controller causes an input current at the charging circuit to increase at a first rate of change in response to a start signal. When the controller detects an increase in a charging voltage at the power storage up to a first voltage at which driving of the first load is possible, the controller controls the charging circuit to cause the input current at the charging circuit to increase at a second rate of change lower than the first rate of change. The charging circuit is controlled by the controller to cause the input current to increase at the second rate of change, and the charging voltage at the power storage increases up to a second voltage at which driving of both the first load and the second load is possible.

Backup power system

A DC-DC converter includes a switch element connected to an input end, a coupling capacitor connected to the switch element at a first node, a first inductor connected to the coupling capacitor at a second node and connected to an output end at a third node, a control circuit that controls the switch element, a second inductor connected to the first node and a ground, a first diode connected to the second node and the ground, a smoothing capacitor connected to the third node and the ground, a comparator, a second diode connected to the second node and the comparator to supply a power voltage powering the comparator, and an output capacitor connected to the second diode and the ground. The comparator compares a voltage at the output end with a reference voltage so as to output a comparison result to the control circuit. This DC-DC converter operates stably.

Zeta converter generating control power from an internal node

A vehicle-mounted power source device includes: a power storage unit; a charging unit; a discharging unit; and a control unit which controls operations of the charging unit and the discharging unit in accordance with an activation signal. When the control unit receives the activation signal, the terminal voltage of the power storage unit becomes the first voltage through a charging operation of the charging unit, and when the control unit finishes receiving the activation signal, the discharging unit starts a discharging operation, and the terminal voltage of the power storage unit is reduced to a second voltage lower than the first voltage. The charging unit applies a third voltage lower than the second voltage to the power storage unit between (i) when the terminal voltage of the power storage unit becomes lower than the second voltage or when a predetermined length of time has elapsed since the terminal voltage of the power storage unit became lower than the second voltage and (ii) when the control unit receives the activation signal again.

Vehicle-mounted power source device

When the output voltage of a vehicle battery is lower than a lower limit value of an activation voltage, a power storage is charged with electric power supplied from the outside to a contactless power receiver, and thus the electric power stored in the power storage is supplied to a controller via a discharger to enable the controller to be activated. After the controller is activated, the controller causes a battery relay to be connected using the electric power supplied from the power storage via the discharger. Electric power is supplied from a high voltage battery to the vehicle battery to enable the vehicle battery to output a voltage higher than or equal to the lower limit value and enable a plurality of relays to be connected.

Vehicle-mounted power supply apparatus

An in-vehicle power supply device according to the present disclosure includes an input terminal, a charge-discharge circuit connected to the input terminal, a first output terminal connected to the charge-discharge circuit via a first switch unit and a first cut-off unit, a second output terminal connected to the charge-discharge circuit via a second switch unit and a second cut-off unit, and a controller connected to the input terminal, the first output terminal, and the second output terminal. The controller controls the charge-discharge circuit, the first switch unit, the first cut-off unit, the second switch unit, and the second cut-off unit. When the controller detects that a voltage of the first output terminal becomes lower than the first load threshold voltage, the first cut-off unit changes from a connected state to a cut-off state. After a lapse of a first predetermined period following a time at which the controller detects that the voltage of the first output terminal is lower than the first load threshold voltage, the second switch unit switches from a state of higher-resistance conduction to a state of lower-resistance conduction in which a resistance level is lower than the resistance level in the state of higher-resistance conduction.

In-vehicle power supply device

An on-vehicle power supply device according to the present disclosure includes an electricity storage, a charge circuit, a discharge circuit, an input unit, an output unit and a controller. When the controller decides that an emergency operation condition is satisfied, the controllers causes the charge circuit to stop charging power to the electricity storage, then sets an output instruction voltage that is a target voltage value of an output of the discharge circuit to a first voltage value, the controller further causes the discharge circuit to discharge the power charged in the electricity storage, and, when the power output from the discharge circuit becomes higher than a power threshold, the controller lowers an output instruction voltage from a first voltage value to a second voltage value.

On-vehicle power supply device and vehicle having on-vehicle power supply device mounted thereon

A door latch power supply device includes an electricity storage unit, a charger, a discharger, a contactless power receiver, an input port configured to be connected to an external power supply, an output port configured to be connected to an actuator, and an operation signal receiver configured to receive an operation signal sent in response to an operation for opening a door. While an input voltage input to the input port is higher than or equal to a first input threshold, the charger operates using power supplied from the external power supply so as to cause a storage voltage of the electricity storage unit to become a first storage voltage value, and the discharger outputs power in the electricity storage unit to the output port to place the actuator in the unlatched state in response to the operation signal received by the operation signal receiver. While the input voltage is lower than the first input threshold, the charger operates using power supplied from the contactless power receiver so as to cause the storage voltage to become a second storage voltage value, and then the discharger outputs power in the electricity storage unit to the output port to place the actuator in the unlatched state in response to the operation signal received.

Door latch power supply device, door latch power supply system, and vehicle using same

An in-vehicle emergency power supply device includes a power storage unit including an electric double-layer capacitor, a charging circuit charging the power storage unit, a discharging circuit discharging the power storage unit, and a controller controlling the charging circuit and the discharging circuit. When the charging circuit charges the power storage unit, the controller determines a set full charging voltage of the power storage unit, determines a correction charging voltage lower than the set full charging voltage based on the set full charging voltage, and controls the charging circuit to charge the power storage unit until a stored voltage reaches the correction charging voltage. This in-vehicle emergency power supply device stabilizes an output voltage thereof.

Vehicle-mounted emergency power supply device

A power source device of present disclosure includes: a first power storage element; a second power storage element that is connected in parallel to the first power storage element and that has a lower internal resistance than an internal resistance of the first power storage element and a lower storage capacity than a storage capacity of the first power storage element; an opening and closing part that is connected between the first power storage element and the second power storage element and that switches between a disconnection state and a connection state; a charge circuit that is connected to an input route of the first power storage element and that performs a step-down operation; a discharge circuit that is connected to an output route of the second power storage element and that performs a step-up operation; and a controller that controls operations of the opening and closing part, the charge circuit, and the discharge circuit.

Growing community of inventors

Fukushima, Japan

Takashi Higashide