| 摘要 |
<p>A control circuit for connecting an electrical consumer appliance to a supply mains during an adjustable pre-determined time interval comprises a relay switch (7) coupled into the supply line (6) to the consumer appliance, the relay coil of which is activated and deactivated by means of a drive circuit (9) with a timer function. The relay activating signal is provided at the output of the drive circuit and is generated in response to a change of the voltage level of a toggle signal supplied to the drive circuit (9) and generated by a pulse-shaping circuit (13) connected to the supply mains in response to a brief interruption of the supply voltage. Means (C) are associated with an adjusting unit (11) for supplying operating voltage to the drive circuit for maintaining the operating voltage during such a brief interruption.</p> |
