| 摘要 |
<p>PURPOSE:To prevent malfunction to be caused by an alarm reset signal by providing an alarm holding circuit in a control circuit, resetting the circuit by the alarm reset signal, and supplying only a power-on signal from a control signal forming part to a power source circuit. CONSTITUTION:When abnormality occurs in the power source circuit 1, an alarm signal AS is generated, and a latch circuit 12 holds the signal AS, and also, inputs it to a conversion circuit 22 in the control circuit 2. The circuit 22 forms a pulse signal, and makes the alarm holding circuit 23 hold it, and furthermore, supplies it to the control signal forming part 21. The alarm reset signal RS is supplied from the circuit 21 to the circuit 23, and an alarm holding signal is released, thereby, the circuit 21 outputs the power-on signal PS, and it is supplied to a power control part 11 and the circuit 12. Thus, since the circuit 23 is reset by the signal RS and only the signal PS is supplied from the circuit 21 to the power source circuit 1 and an alarm is reset and a power supply operation is started, the malfunction of the circuit 1 to be caused by the signal RS is prevented.</p> |
