The output voltage of the polarity conversion power supply is opposite to the polarity of the input voltage, so the absolute value of the output voltage should be higher than the absolute value of the input voltage. This power supply is a combination of the above two types of power supply. When the switch is turned on, the input voltage is applied to both ends of the inductor, and the inductor will generate current. At this time, the inductor will store energy, and the diode will be cut off in reverse. When the switch is closed, the current flowing through the inductor decreases gradually, while the induced electromotive force makes the diode charge the capacitance. The capacitor voltage is in the opposite direction to the input voltage. If the voltage at both ends of the load drops, the capacitor can discharge to the load again, and the final output voltage may be higher than the input voltage.<br>
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