Three-phase input power supply phase loss detection circuit
The invention provides a three-phase input power supply phase loss detection circuit which comprises a signal conversion circuit, a self-locking circuit and an output circuit. The signal conversion circuit is used to convert three-phase power supply input voltage into a level signal. The self-lockin...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention provides a three-phase input power supply phase loss detection circuit which comprises a signal conversion circuit, a self-locking circuit and an output circuit. The signal conversion circuit is used to convert three-phase power supply input voltage into a level signal. The self-locking circuit is used for locking a high level signal. The output circuit is used for outputting the level signal. The input end of the signal conversion circuit is connected with a three-phase power supply, and the output end is connected with the input end of the self-locking circuit. The output end of the self-locking circuit is connected with the input end of the output circuit. When the three-phase voltage input is normal, the output circuit outputs a low level. If any one of the three-phase voltage of external three-phase alternating current fails or is lost, the output circuit continues to output a high level and latches off. Whether the output level signal detection power supply of the output circuit has phase |
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