1. The basic circuit of switching power supply
(1) switch circuit, (2) excitation circuit, (3) voltage regulator circuit, (4) protection circuit, (5) output circuit
2. New technology of switching power supply
1) Quasi-resonant technology, (2) PFC, (3) resonant switching power supply, (4) dual-tube PFC, (5) digital control power supply
3. The development of switching power supply In the 1980s, the 220V power supply directly passed the transformer to obtain the required low voltage. At that time, the tube voltage was stronger than that of the semiconductor, but the output voltage was unstable. It was bulky and heavy. Later developed to linear circuits and then to switching power supplies
4. Characteristics of different power supplies
Linear Regulators are Simple, Reliable, Narrow Range, and High Loss
Switching power supply: large dynamic range, low loss, complexity, high failure rate
Transformer: All outputs are regulated, multiplexed, isolated
5: Inductor current mode of switching power supply
critical current mode
