Tdk Corporation

Tdk-lambda Corporation

Noriyuki Hirao

Hiroshi Nakazawa

Masahiko Hirokawa

Tadao Senriuchi

Takumi Sakamoto

A number of cells can be determined before control for a battery without providing cell number setting and input means. The cell number determination device comprises voltage measuring units that select an 'i'th cell among cells that are connected in series and that configure a battery, and that measure a voltage value between a terminal in which the 'i'th cell and an (i&#x2212;1)th cell, which is in one location higher than the &#x201c;i&#x201d;th cell, are connected and a ground potential line, voltage comparators that determine an existence, nonexistence or normality of the cells by comparing a voltage value of an (i+1)th cell that is in one location lower than the &#x201c;i&#x201d;th cell with the voltage value of the &#x201c;i&#x201d;th cell measured by the voltage measuring units and a cell number determination unit that determines a number of assembled cells and normal cells and cell assembled locations in the battery.

Method for determining cell number, cell number determination device, power supply device and program

A reusable period of a battery can be maintained for a long time by recharging while avoiding abnormal heating of the battery due to over discharge. A battery protection circuit comprises a control part that cuts off a discharge switch which is a discharge path to a load for a battery when a voltage value of the battery is equal to or less than a first threshold value, or when the voltage value of the battery is less than the first threshold value, wherein the control part cuts off a power switch as a power supply path to the control part itself when the voltage value of the battery is equal to or less than a second threshold value, or when the voltage value of the battery is less than the second threshold value which is lower than the first threshold value.

Battery protection circuit, method for protecting battery, power supply device and program

A power supply control device for controlling power supply to a pair of terminals to which a load is connected, comprising a voltage measuring part for measuring a voltage which has a predetermined relationship with the voltage of the pair of terminals, a short circuit detecting part for detecting whether a short circuit exists between the pair of terminals based on the measured voltage and for making power supply to the pair of terminals stop when existence of a short circuit is detected, and a constant current supplying part for supplying a constant current though the pair of terminals; wherein the short circuit detecting part is configured to detect that the previously detected short circuit is eliminated when the voltage measured by the voltage measuring part is equal to or greater than a predetermined threshold value upon supplying the constant current through the pair of terminals.

Growing community of inventors

Tokyo, Japan

Noriyuki Hirao