| 摘要 |
PROBLEM TO BE SOLVED: To obviate a commercial power supply for standby by reducing the power requirements of an auxiliary power supply for standby power for an electronic circuit using a high-capacitance electric double layer capacitor, a photocell, a latch relay, and the like. SOLUTION: An auxiliary power supply for standby comprising a photocell, an electric double layer capacitor, and a diode is connected with power supply terminals 1, 2, and 3. In ordinary state, signals from a remote controller actuate a flip-flop U3A through a light receiving element U5 and a timer U4. The output signals of the flip-flop U3A drive monostable multivibrators U2A and U2B, and transistors Q1 and Q2 connected with the output side are alternately turned on. Then the photo triac of a photoisolator is brought into conduction to invert a latching relay K1, and a commercial current is let to flow. On standby, the electric double layer capacitor is charged by the photocell of the auxiliary power supply for standby power. Thus a commercial power supply for standby is obviated. |
