| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC power supply device which is capable of applying a voltage which does not exceed a set value to a circuit as a DC power supply device which does not have a remote sensing function even if a voltage monitor line is open-circuited, while a power is supplied to the circuit and can check whether the voltage monitor line is an open-circuited or not before a power is supplied to the circuit. SOLUTION: A resistor R1 is connected between a plus side output terminal 4p and a plus side sensing terminal 5p, a resistor R2 is connected between a minus side output terminal 4m and a negative side sensing terminal 5m and a series circuit, consisting of a resistor R3 and a switch S1 is connected between the plus side sensing terminal 5p and the minus side sensing terminal 5m. In a normal use state, a switch S1 is opened. At the checking of the switch S1 is closed. At that time, if a plus side voltage monitor line is open-circuited, the output voltage ofa n operational amplifier 11 is R3×Vo/(R1+R2). If a negative side voltage monitor line 3m is open-circuited, the output voltage of the operational amplifier 11 is R3×Vo/(R2+R3). |
