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The stopper circuit comprises a load resistor, a diode and a controllable change. The load resistor features a initial terminal electrically linked towards the beneficial electrode or even the direct current supply. The positive electrode in the diode is electrically linked towards the inverter, whilst the detrimental electrode thereof is electrically connected towards the 2nd terminal of your load resistor. The controllable change features a supply terminal, a load terminal along with a control terminal. The supply terminal of the controllable change is electrically connected to the second terminal with the load resistor as well as the unfavorable electrode in the diode. The load terminal from the controllable swap is electrically linked to the unfavorable electrode on the immediate current source. The manage terminal on the controllable change is electrically connected to the protection signal processing circuit. The protection sign processing circuit includes a diode, a filter capacitor, a initial delay resistor, a second delay resistor, a Zener diode and an interference-filtering capacitor. The optimistic electrode on the diode is electronically connected to 1 terminal in the output winding. The very first terminal on the filter capacitor is electrically linked towards the negative electrode of your diode, and also the second terminal thereof is electrically connected towards the other terminal of the output winding and also the negative electrode with the direct current source. The first delay resistor includes a 1st terminal electrically connected to the unfavorable electrode of your diode and also the 1st terminal from the filter capacitor. The first terminal on the second delay resistor is electrically linked to the second terminal of the very first delay resistor, as well as the second terminal from the 2nd delay resistor is electrically connected to the unfavorable electrode of your immediate current source. The first terminal in the delay capacitor is electrically linked to the second terminal of the very first delay resistor along with the first terminal in the 2nd delay resistor. The 2nd terminal of the delay capacitor is electrically linked towards the initial terminal of your negative electrode in the direct current source. The detrimental electrode on the Zener diode is electrically connected to the 2nd terminal of the very first delay resistor, the very first terminal on the 2nd delay resistor and the initially terminal of your delay capacitor. The optimistic electrode on the Zener diode is electrically linked towards the stopper circuit. The first terminal of the interference filtering capacitor is electrically linked to the beneficial electrode of the zener diode and the stopper circuit, plus the 2nd terminal thereof is electrically linked to the detrimental electrode from the direct current source.