POWER UNIT OF ELECTRONIC COUNTER

摘要

PURPOSE:To avoid the malfunction of the counter due to the erroneous signal of the service interruption time by providing the 2-series rectifier circuits connected to the AC power source plus the constant voltage circuit and thus securing the different value for the fall of the power source at the service interruption time as well as accelerating the voltage fall of the power circuit to be applied to the counter circuit. CONSTITUTION:The power circuits of the 2-series consisting of rectifier circuits 231 and 232 plus constant voltage circuits 251 and 252 are connected to the secondary side of transformer 22 connected to AC power source AC. And the discharge time of output voltage E2 caused by circuits 232 and 252 of one side and at the service interruption time is made shorter than output voltage E1 caused by circuits 231 and 251 of the other side. Voltage E2 featuring the shorter discharge time is supplied to the counter main body, and voltage E1 featuring the longer discharge time is supplied to electronic unit 26 which supplies the input signal to the counter main body. Thus the power voltage to be supplied to the counter main body is stopped quickly at the service interruption time. In such way, the counter malfunction due to the input signal can be prevented.