Three-phase input power supply phase loss detection circuit
A technology for input power supply and phase loss detection, which is applied in power supply testing, multi-phase network asymmetry measurement, etc., can solve the problems of high cost, complex electronic phase loss protection circuit, and low reliability, and achieve fast inspection and anti-interference ability Strong and stable effect
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[0011] The present invention will be further described in conjunction with accompanying drawing:
[0012] Such as figure 1 The embodiment of the present invention shown is a phase loss detection circuit of a three-phase input power supply, including a signal conversion circuit 1, a self-locking circuit 2 and an output circuit 3, and the signal conversion circuit 1 is used to convert the input voltage of the three-phase power supply to Level signal; the self-locking circuit 2 is used to lock the high-level signal; the output circuit 3 is used to output the level signal; the input terminal of the signal conversion circuit 1 is connected to the three-phase power supply, and its output terminal is connected to the input terminal of the self-locking circuit 2 , the output end of the self-locking circuit 2 is connected to the input end of the output circuit 3, and the output circuit 3 includes an optocoupler V4, a Zener diode D5, a capacitor C5, and resistors R18 and R19. The anode...
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