| 摘要 |
<p>A time-delay power-off circuit and a time-delay power-off socket. The time-delay power-off circuit comprises a direct current relay used to switch on or off electrical connection between a power line and a plug-in connecting end of the socket, and further comprises a control switch (SW), a power-on and voltage reduction rectifying circuit (1), an energy storage capacitor (C0), a charging circuit (3), and a charging and voltage reduction rectifying circuit (2). The socket comprises an alternating current input power line and a plug-in connecting end of the socket. The power line is connected to the time-delay power-off circuit. When the control switch is switched on, the direct current relay immediately performs power-on suction, the socket is capable of supplying power, and the energy storage capacitor can be charged at the same time. When the control switch is switched off, the energy storage capacitor continues to supply power for a direct current relay coil, to keep the relay in a suction state, thereby realizing the time-delay power-off function. A super capacitor is used as the energy storage capacitor, so that the delay time is increased, the circuit structure is simple, the used devices are few, the volume is small, the reliability is high, the performance is stable, and the cost is low.</p> |
