Enable control circuit, switching power supply controller and control method
A control circuit and switching power supply technology, applied in the field of power electronics, can solve the problems of high cost and large standby power consumption, and achieve the effects of low cost, low power consumption and wide application range
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[0047] The design idea of the present invention is: the present invention uses the button to control the relay, arranges the button outside the switching power supply controller, and integrates related circuits inside the switching power supply controller.
[0048] The invention provides an enabling control circuit, a switching power supply controller and an enabling control method. To be introduced below.
[0049] 1: Enable control circuit
[0050] The enabling control circuit of the present invention is suitable for existing switching power supply controllers.
[0051] Such as Figure 4 Shown is the application block diagram of the enable controller. Figure 5 Circuit diagram for the entire circuit. The enabling control circuit of the present invention includes a key switch (sw1 in the figure) and a control circuit. The control circuit includes a series circuit connected in sequence, a trigger circuit and an enabling control circuit; the output end of the enabling con...
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