Gs Yuasa International Ltd.

Masayuki Imura

Takeshi Nakamoto

Yoshihiko Mizuta

Tomohiro Kawauchi

Yuki Imanaka

Seiji Takai

An overcurrent detection device including: a current detection resistor that is connected in series to a main circuit and is configured to cause a potential difference at both ends according to a current flowing through the main circuit; a current detection circuit that includes a pair of connection portions and is configured to detect a potential difference between the pair of connection portions; a pair of voltage detection lines connecting the both ends of the current detection resistor to the pair of connection portions in the current detection circuit; and an erroneous detection prevention unit configured to prevent an increase in the potential difference between the pair of connection portions when at least any one of the pair of voltage detection lines has a connection failure.

Overcurrent detection device, energy storage apparatus, and current detection method

A measurement deviceof an electrochemical elementthat is connected, via a first switch, to a terminal partP having a load connected thereto, wherein: the measurement deviceis provided with a current limitation unitprovided to a bypass path BP of the first switch, a current sensorfor measuring the current of the electrochemical element, and a processing unit; when a voltage difference &#x394;V between the voltage of the electrochemical elementand the voltage of the terminal partP is equal to or greater than a prescribed value, the current limitation unitpermits the supply of power to the load through the bypass path BP, and when the voltage difference &#x394;V is less than the prescribed value, the current limitation unitcuts off the current to the bypass path BP; and in a period of time after the first switchhas been turned off and until the voltage difference &#x394;V reaches the prescribed value due to a change in voltage of the terminal partP because of discharging of a charge/discharge elementconnected in parallel to the load, the processing unitperforms a measurement process to measure the offset error &#x3b5; of the current sensor

Measurement apparatus, energy storage apparatus, measurement system, and offset error measurement method

A power supply protective device, includes: a first switch provided between a first terminal to which at least one of a load and a charger is connected and a second terminal to which a power supply is connected; a switching circuit connected in parallel to the first switch and including a second switch and a voltage drop element connected in series to the second switch, the voltage drop element causing a voltage drop of a reference voltage by a current flow; a voltage detection unit which detects at least one voltage of a first voltage as a voltage of the first terminal, a second voltage as a voltage of the second terminal, and a third voltage as a voltage at a point between the second switch and the voltage drop element; and a control unit.

Power supply protective device, power supply device and switch failure diagnosing method

A power supply protective device, when obtaining an open voltage when a second switch is brought into a closed state and a first switch is brought into an open state during discharging of a power supply, and obtaining a close voltage when the second switch is brought into the closed state and the first switch is brought into the closed state during discharging of the power supply, diagnoses the first switch as having a failure or not on the basis of the open voltage and the close voltage. When executing first a close instruction to the first switch and the second switch, if a voltage difference is less than a first threshold voltage, the first switch is determined to have no open failure, and/or when not less than a second threshold voltage, the second switch is determined to have no open failure.

Growing community of inventors

Kyoto, Japan

Masayuki Imura