PTC three-phase asynchronous motor protection circuit three
Source: InternetPublisher:smallembedded Keywords: PTC protection circuit three-phase asynchronous motor motor protection Updated: 2021/12/06
The common-emitter coupling trigger (i.e. Schmitt trigger
) is composed of PI.]P type transistors VT2, VT3, etc., which is equivalent to a switching circuit to detect changes in the resistance of the PTC thermistor and control the intermediate relay KA. action.
In the figure, a simple series voltage stabilizing link is composed of a transistor (adjusting tube) VTi, a voltage regulator tube VS, etc., which is suitable for
situations where the power supply voltage fluctuates greatly.
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