Switching power supply

A general term for power supply devices that control output by turning on and off using high-frequency switching with components such as oscillators and transistors in a power circuit. The output voltage is mainly controlled by the ratio of on to off time (duty cycle). There are various classification methods, including non-resonant and resonant types, non-isolated and isolated chopper types, single-transistor and multi-transistor types, self-excited and externally excited types, and PWM and FM methods.

See a more detailed basic explanation of switching power supplies, circuit design types, and history