| 摘要 |
<p>PURPOSE:To reset exactly an electronic controlling circuit even in case when an electric conduction is executed again after the short time cut-off of a power source, by applying a reset signal, in a period in which an input voltage of a constant-voltage circuit exceeds a voltage for outputting a set voltage. CONSTITUTION:When a normally opening switch 7 and 9 of an operating witch 5 are brought to a closing operation, an AC voltage is applied between power source lines 11, 13, it is converted to DC, and a voltage V0 is applied between power source lines 16A, 16B. An output voltage V1 of a constant-voltage circuit 18 is stabilized to a constant voltage V1r, when the voltage V0 exceeds Vr. On the other hand, a constant-voltage diode 26 of an initializing circuit 25 conducts, when the voltage V0 has reached Vr, a transistor 28 is turned on, and a reset terminal 22r of an electronic control circuit 22 rises to a high level. After reset has been ended, and read of a selecting signal is ended, an output terminal O2 is varied to a high level, a relay coil 38a of a relay 38 is conducted electrically and energized, and the power source line 11 is connected to power source terminal 2 through a relay armature 38a and self-held.</p> |
