Boost circuit: chopper type switching regulator power supply

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Summary:

The switching power supply whose absolute value of the output voltage is lower than or equal to the absolute value of the input voltage is buck. The absolute value of the output voltage of the boosted chopper-type switching regulator must be higher than the absolute value of the input voltage and their polarities are the same. The figure is a schematic diagram of a boosted chopper-type switching regulator power supply. When the switching regulator is controlled to saturate, current flows through the inductor, causing it to store energy. When the switching element VT is controlled to be turned off, the energy stored in the inductor is supplied to the load through the diode VD while charging the capacitor C. When the load voltage is to drop, the capacitor discharges again. At this time, a stable voltage higher than the input can be obtained. Since the switching element VT is connected in parallel with the load RL, it is also referred to as a parallel switching power supply.