The development of switch regulated power supplies
The development of switch regulated power supplies
The three important development stages of switch regulated power supply:
The first stage is the development of power semiconductor devices from bipolar devices (BpT, SCR, GT0) to MOS devices (power MOS-FET, IGBT, IGCT, etc.), making it possible for power electronic systems to achieve high-frequency, significantly reduce conduction losses, and simplify circuits.
The second stage began in the 1980s, with the research and development of high-frequency and soft switching technologies, resulting in better power performance, lighter weight, and smaller size. High frequency and soft switching technology has been one of the hot topics in the international power electronics industry over the past 20 years.
The third stage began in the mid-1990s, with the development of integrated power electronic systems and integrated power electronic modules (IpEM) technology, which is one of the new problems that urgently need to be solved in the international power electronics community today.
Classification of switch regulated power supplies
1. According to the driving mode of the switch adjustment tube, it can be divided into self-excited and separately excited types. Introducing synchronous signals on the basis of self-excited can form a synchronous switching voltage stabilizing circuit.
2. According to the control method of voltage stabilization, it can be divided into pulse width modulation type and pulse frequency modulation type, or a combination of the two to form a mixed modulation type.
3. According to the structural form of power switch circuits, they are divided into step-down, step-up, reverse, and transformer types.
Advantages and disadvantages of switch regulated power supply
Advantages: Low power consumption and high efficiency.
Disadvantage: There is severe switching interference.
Highlights of Switching Power Supply Technology
1. Performance of power semiconductor devices
2. Power density
3. High frequency magnetic components
4. Soft switching technology
5. Synchronous rectification technology
6. Power Factor Correction (pFC) Converter
7. Fully digital control
8. Electromagnetic compatibility
9. Design and testing techniques
10. System integration technology
