| 摘要 |
PROBLEM TO BE SOLVED: To provide a charge control circuit which can perform trickle charge with a simple configuration and automatically change a power source to a secondary battery in an emergency.SOLUTION: A secondary battery charge control circuit includes: a current restriction resistor; a power supply unit; a secondary battery charge circuit including a first diode connected in series to the current restriction resistor; a secondary battery connected to the secondary battery charge circuit; and a secondary battery discharge circuit including a second diode connected between the secondary battery and the output terminal. Further, the secondary battery charge control circuit includes a photocoupler circuit, which is connected between a connection terminal for connecting the current restriction resistor to the secondary battery charge circuit and the output terminal, for externally outputting a signal indicative of full charge when the secondary battery is in a full charge state.SELECTED DRAWING: Figure 1 |
