High-Power Switching Power Supply Switching power supply design is a relatively new approach that solves many of the problems that exist in linear power supply design, including transformer size and voltage regulation.

---

In a switching power supply design, the input voltage is no longer reduced, but rectified and filtered at the input, then converted into a high-frequency pulse train by a chopper, and filtered and rectified again before the voltage reaches the output.

---

The switching transistor used in the switching power supply is mostly switched between the fully open mode (saturation zone) and the fully closed mode (cut-off zone), both modes have the characteristics of low dissipation, and the conversion between the switching will have a higher dissipation, but the time is very short, so it is more energy-saving and produces less waste heat. Ideally, the switching power supply itself does not consume electrical energy.

---

Voltage regulation is achieved by adjusting the timing of transistor conduction and circuit breaking. Conversely, in the process of generating the output voltage of a linear power supply, the transistor operates in the amplification area, which itself consumes electrical energy.

---

The high conversion efficiency of the switching power supply is one of its major advantages, and because the switching power supply works at a high frequency, a transformer with a small size and light weight can be used, so the switching power supply will be smaller than the linear power supply, and the weight will be relatively light.