| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of components of a low voltage abnormality detection circuit for a power supply device which has a plurality of feeding output circuits with different output voltages and reduce the size and the cost of the device. SOLUTION: The decline detection reference potentials of voltage detection points (A)-(C) of the respective outputs (1)-(3) of a plurality of feeding output circuits are given by the potentials of the connection points (D)-(F) of resistors R1-R4 connected in series to each other. Further, the voltage detection points (A)-(C) of the respective feeding output circuits are connected to the connection points (D)-(F) of the resistors which have the corresponding decline detection reference voltages via diodes D1-D3. The potential decline of the connection point (F) of the resistors is detected by a detecting means common to the plurality of feeding output circuits, for instance a voltage comparison circuit comp, and an alarm signal ALM is outputted by a photocoupler PI. |
