| 摘要 |
<p>Method and appliance which detects if the interruption of current to an electrified load which is connected to a switched electrified point of an alternating network was by the user volition, or is due to a general electrical blackout, or if there was no interruption of electrification. With the aid of a microcontroller, the network voltage is calculated and then, by measuring period T, existence of rectification is calculated, in order to determine the status of switch (3), namely if half sine period is detected the switch is open and if a full sine period is detected the switch is closed, both cases with user volition, without the occurrence of a general electrification blackout, in which case the command is executed via the existing AC load control relay (25), while battery (9) always remains in charge mode, while if it is detected that the Period is equal to infinity, then there has been a general electrical blackout, operation is switched into rechargeable battery (9) operation and external load (13) is connected via power circuit (12).</p> |
