| 摘要 |
PROBLEM TO BE SOLVED: To provide a current detection circuit capable of performing stable current detection for performing charging/discharging control by correcting the voltage fluctuation of a rectifying element due to temperature change and a charging/discharging circuit.SOLUTION: A current detection circuit includes: an FET 15 as current control means which performs the ON/OFF operation of currents flowing through a circuit; voltage detection means constituted by a rectifying element D1 which detects a voltage to be generated in the FET during the ON operation of the FET 15 and a resistor R1 as a current adjustment element; voltage amplification means for amplifying the voltage from the voltage detection means; and output means constituted by resistors R2 and R3 for outputting the voltage amplified by the voltage amplification means to a control part which controls the FET 15 and a rectifying element D2. The rectifying elements D1 and D2 of the voltage detection means and the output means have voltage change characteristics with which a voltage changes in accordance with the size of currents and the change of temperature, and currents flowing through the rectifying elements are set by the resistance of the voltage detection means and output means such that the rate of the voltage fluctuation of the rectifying elements D2 and D1 due to the change of temperature becomes predetermined times determined by the gain of the voltage amplification means. |
