Push-pull type converter

A type of step-down converter in which the primary side and the secondary side are isolated by a transformer. The circuit uses multiple switching elements, employs an externally excited oscillation method, and is controlled by PWM. It is mainly used as an AC-DC converter and functions similarly to a forward converter but can supply more output power than a forward converter. Compared to other types of switching converters, it has the advantage of delivering higher power, but the disadvantage of having more components and a more complex circuit. It has two switches that alternately turn on and off at the same duty cycle to supply power to the load. Although kickback voltage does not occur, the switches are subjected to more than twice the input voltage, so high-voltage-tolerant switches are required. Therefore, it is often used in electrical and electronic devices with low input voltage.