Startup and shutdown circuit
A switching circuit and circuit technology, which is applied in the direction of electrical program control, sequence/logic controller program control, etc., can solve the problems of power supply oscillation, equipment damage in switching power supply, etc., and achieve low standby power consumption and high circuit reliability performance, the effect of simple circuit
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[0016] The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.
[0017] Such as figure 1 Shown is a schematic block diagram of a specific embodiment of the present invention. The power-on circuit of the embodiment includes a hard-on circuit, a soft-off circuit, a forced-off circuit, a system power supply, and a power-on button respectively connected to the input terminals of the hard-on circuit, soft-off circuit, and forced-off circuit, and a switch connected to the soft-off circuit. The system main control chip, in which the hard boot circuit, soft shutdown circuit, and forced shutdown circuit are composed of discrete components. The output of the hard boot circuit is connected to the system power supply, and the output of the soft shutdown circuit and the forced shutdown circuit are connected to the system through the hard boot circuit Power connection. In this embodiment, each circuit is composed of dis...
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