Photoelectric phase failure protection circuit
Source: InternetPublisher:spectrum Keywords: Protection circuit photoelectric type phase failure protection BSP Updated: 2020/02/20
It uses three light-emitting diodes VLi-VLs and three photoelectric tubes VTi-VT3 as
detection elements. Use a file to remove the tube caps of VTi~VT3 to expose the die silicon.
When one phase of the power supply is missing, one light-emitting diode does not light up, the transistor VT4 is cut off, and VTs is turned on, causing the relay
KA to close, the contactor to release, and the motor to stop.
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