1. Development history of high-power switching power supply
Before the 1980s, as an updated product of linear regulated power supplies, switching power supplies were mainly used for low-power occasions. At that time, medium and high-power DC power supplies were still dominated by thyristor phase-controlled rectification.
Since the 1980s, the appearance of Insulated Gate Bipolar Transistor (IGBT) has broken this pattern.
Compared with traditional thyristor phased rectification, the frequency is higher, it is easier to drive, and it has outstanding advantages.
The increase of the switching frequency can reduce the size and weight of the power supply, but increase the switching loss and reduce the power supply efficiency. In order to solve this problem, in the 1980s, quasi-resonant technology zero-voltage switching circuit and zero-current switching circuit appeared, this technology became soft switching technology. Using soft switching technology, under ideal circumstances, it can make the switching loss zero, improve efficiency, and make the power supply further develop in the direction of small size, light weight, high efficiency and large power density.
Today, high-power switching power supplies have been widely used in industrial automation control, military equipment, scientific research equipment, industrial control equipment, communication equipment, power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating and other fields.
Single Module IGBT Power Supply Multiple Modules IGBT Power Supply
2. The comparison of high-power high-frequency switching power supply and traditional SCR (thyristor) power supply
Traditional rectified power supply
Conventional switching power supply
Using soft switching high frequency switching power supply
High frequency transformer
Phase shift trigger
Steady flow accuracy
<80% (Low voltage output)
≤0.9 (Without compensation)
3. The use of high-power high-frequency switching power supply
With the maturity of technology and the improvement of reliability, high-power high-frequency switching power supply has been widely used in medium and high power occasions, especially at low voltage due to its advantages of high efficiency, small size, high power factor, modularity, and high cost performance.
Applications with power less than 500kW, such as electroplating, anodizing, electrolytic polishing, and electrofluorination to produce fluorine gas, require low DC output voltage, usually within 20V, and the high-frequency switching power supply has higher conversion efficiency Power saving, so it is favored by users. In addition, high-power switching power supplies are also widely used in small and medium-power loads, such as water treatment, hydrogen production from electrolyzed water, electrolyzed seawater, electrolyzed brine, and battery charging. Its cost performance is higher than that of SCR power supplies.
Green Power continues to devote to the research and development, manufacturing and application of high-power high-frequency switching power supplies. The doctoral and master technical teams have more than 15 years of development experience. They have a thorough understanding of switching power supplies, mature technology, high reliability and high output accuracy. And passed the European CE and American UL certification, for domestic and foreign users has provided more than 10,000 IGBT high-power high-frequency switching power supply, exported to more than 50 countries, and cooperate with many of the world's top 500 enterprises.
4. The working principle of high-power high-frequency switching power supply
The hardware circuit of the high-power high-frequency switching power supply is mainly composed of two parts: the main circuit and the control circuit. The main circuit mainly includes: rectifier circuit, lightning surge and filter circuit, full-bridge high-frequency inverter circuit, ultra-microcrystalline high-frequency transformer, secondary full-wave rectifier circuit, etc.
The power circuit unit adopts high frequency PWM conversion technology and soft switching technology to realize DC output. The control part takes the high-performance digital signal processor DSP as the core, and uses the LCD touch screen as the HMI human-machine interaction interface to display the power supply operating parameters in real time.
Figure 1 High-power switching power supply system diagram
The main circuit principle of the power module is shown in Figure 2:
Figure 2 Schematic diagram of the main circuit of the power module
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