| 摘要 |
Method and device by which it is identified if the cut of load power supply that is connected to an intermittent point of alternating network was made voluntarily by the user or it is owed to a general power cut or if no cut of the power supply has been made. By the assistance of a microcontroller, the voltage of the network is calculated and subsequently, measuring T period the presence of rectification is calculated, so as to find the status of the switch (3), namely if a half sine period is detected the switch is on and if a complete period is detected the switch is off, in both cases by selection of the user, without a general power cut has been made, therefore its order is executed via the control relay of an existing AC load (25); whereas the battery (9) always remains in a charging mode, whereas if its found that the period is equal to infinity, then a general power cut has been made, the operation is transferred to operation by rechargeable battery (9) and the external load (13) is connected via the power circuit (12). |
