Sanyo Electric Co., Ltd.

Jun Asakura

Tomoyuki Matsubara

Kimihiko Furukawa

Tomonori Kunimitsu

Junya Yano

Masato Nakayama

Hidetsugu Mukae

Taisuke Hamada

An earth leakage detecting device comprises following elements. A first end of coupling capacitor is connected to a current path of power storage connected to load in a state of being insulated from a ground. Voltage output unit generates a periodic voltage that changes periodically, and applies the periodic voltage to a second end of coupling capacitor via impedance element. Voltage measurer measures a voltage at a connection point between coupling capacitor and impedance element. Earth leakage determiner determines presence or absence of an earth leakage between the current path of power storage and the ground on the basis of the measured voltage. Voltage output unit has a preparation period for constantly outputting a potential between a high-side potential and a low-side potential of the periodic voltage before a measurement period for outputting the periodic voltage.

Earth leakage detecting device, and vehicular power supply system

In order to easily detect a disconnection in a lowest-order voltage detection line when a voltage detection circuit for detecting the respective voltage of a plurality of serially connected cells is made redundant, the operation power supply of a first voltage detection circuit and a second voltage detection circuit is fed from both ends of a plurality of serially connected cells. The lowest node of the plurality of cells and the first voltage detection circuit are connected by the two lines of a voltage detection line and a negative power supply line. The lowest node of the plurality of cells and the second voltage detection circuit are connected by a single wire serving as both of a voltage detection line and a negative power supply line.

Management device and power supply system

A voltage detection circuit detects the voltage of a plurality of serially connected cells in a power storage unit. The voltage detection circuit receives a supply of a power supply voltage from both ends of the plurality of cells. A DC-DC converter converts the voltage between both ends of the plurality of cells into another DC voltage. An adjustment circuit adjusts the power consumption of the plurality of cells. The adjustment circuit operates using the DC voltage generated by the DC-DC converter as the power supply voltage.

Power storage unit and power storage system

A integrated circuit includes a plurality of first connection terminals () and second connection terminals () for receiving an input of electrical signals, a first detection section, a second detection section, a plurality of switches (), and a switch control section (). The first detection section is connected to first connection terminals () and obtains input electrical signals. The second detection section is connected to second connection terminals (). Each switch () connects adjacent second connection terminals () among second connection terminals () to each other, and are connected to each other in series. Switch control section () controls to turn off switches () and allows electrical signals input to second connection terminals () to be input to the second detection section, and controls to turn on any switch among switches () to bring adjacent second connection terminals () into electrical continuity.

Integrated circuit with built-in status monitoring unit and power supply device provided with said integrated circuit

A power supply device includes: an assembled battery that is configured of N pieces of battery cells connected in series; (N+1) pieces of measurement lines that obtain analog signals corresponding to terminal potentials of the battery cells; a filter circuit that attenuates a specified frequency component of the inputted analog signals and outputs; and an analog/digital converter that converts the analog signals outputted from the filter circuit into digital signals. The filter circuit is configured of: (N+1) pieces of input terminals; (N+1) pieces of output terminals; (N+1) pieces of filter resistors; and (N+1) pieces of filter capacitors of which one ends respectively connected between the filter resistors and the output terminals and the other ends are connected to each other in common.

Power supply device including a filter circuit that attenuates a specified frequency component of analog signals corresponding to terminal potentials of battery cells connected in series

Growing community of inventors

Hyogo, Japan

Jun Asakura