Forward switching power supply refers to a switching power supply that uses a forward high-frequency transformer to isolate coupling energy. The forward switching power supply has a relatively complex structure and high output power. It is suitable for low-voltage, high-current (100W-300W) switching power supplies. widely. The forward transformer only has the function of voltage transformation, and the whole can be regarded as a buck circuit with a transformer.
The flyback switching power supply refers to the switch electric excitation that uses the flyback high-frequency transformer to isolate the input and output circuits. The transformer not only plays the role of transforming voltage and transmitting energy, but also plays the role of energy storage inductor. The flyback transformer is similar to the inductor the design of. The circuit is relatively simple and easy to control, and the flyback type is widely used in the low power of 20-100W. The flyback transformer can be regarded as an inductor with voltage transformation function, which is a buck-boost circuit.
The rectified output push-pull switching power supply, because the two switching tubes work alternately, is equivalent to the output power of two switching power supplies at the same time, and its output power is about twice the output power of a single switching power supply. The two switching devices of the push-pull switching power supply have a common ground terminal. Compared with the half-bridge or full-bridge switching power supply, the driving circuit is much simpler.
The full-bridge transformer switching power supply also belongs to the double-excited transformer switching power supply. It also has the characteristics of high voltage utilization rate of push-pull transformer switching power supply and high withstand voltage of half-bridge transformer switching power supply. Therefore, the full-bridge transformer switching power supply is often used in occasions with high working voltage and high output power.
