| 摘要 |
PROBLEM TO BE SOLVED: To reduce the loss due to a diode for driving a battery at the time of interrupting the input voltage. SOLUTION: The input of a connection unit is connected with a battery through an FET 10 and a voltage detection control circuit 12 for detecting the interruption of an AC/DC converter. At the time of normal operation of AC/DC converter 3, an FET 11 is turned off and a parasitic diode 10 existing in the FET (drain-source) constitutes an OR diode along with the diode 4 in AC/DC converter 3. A voltage is normally fed from the AC/DC converter 3 and when the voltage drops, it is detected by the voltage detection control circuit 12 and the FET 11 is turned on to feed a voltage from a battery 8. |
