The principle and application of high-frequency switching power supply

High frequency switching power supply is a power converter that utilizes power electronic switching devices to achieve voltage conversion and stability through control circuits. It has the advantages of small size, high efficiency, and high output voltage accuracy, and is widely used in various fields, such as electronic devices, computers, communication, medical, etc.

The basic principle of high-frequency switching power supply is to rectifier and filter the input AC or DC power supply to obtain a smoother DC power; Then, through an inverter, the DC power is converted into high-frequency AC power, and the switching frequency of the inverter is generally in the range of 50-100kHz; After passing through transformers and rectification filtering, a stable DC or AC power supply is output according to the needs of the load. The switching mode of inverters can be divided into two types: pulse width modulation (PWM) and pulse frequency modulation (PFM). Currently, pulse width modulation (PWM) plays a dominant role in switching power supplies. Pulse width modulation is a method of controlling the output voltage by changing the pulse width of the inverter output; Pulse frequency modulation is the process of controlling the output voltage by changing the pulse frequency of the inverter output.

The main advantage of high-frequency switching power supply is: high conversion efficiency, because the switching devices have very small losses when turned on or off; Small footprint, as high-frequency operation allows for significant reduction in transformer and filtering components; The output voltage accuracy is high because the control circuit can precisely adjust and protect the output; It has multiple protection functions, such as short circuit protection, overcurrent protection, over temperature protection, etc.

The main application areas of high-frequency switching power supplies include:

The main application products in the environmental protection industry include water treatment power supplies, electrocoagulation power supplies, and electrodialysis power supplies, which can be widely used for the treatment of various industrial wastewater, agricultural wastewater, medical and domestic wastewater, electrolysis wastewater (i.e. used to recover recyclable metal ions from wastewater or treat organic substances through electrolysis), etc.

The main application product in the electroplating industry is the electroplating power supply. In terms of electroplating, it has obvious effects on various plating types, such as copper plating, nickel plating, chromium plating, gold and silver plating, and electrophoresis. It has uniform coating, strong deep plating ability, fast electroplating speed, dense coating surface, better smoothness and hardness than thyristor rectifiers. It is currently the most advanced rectifier power supply, known as the fourth generation rectifier.

3. The main application product in the electrophoretic coating industry is the electrophoretic coating power supply, which is suitable for cathodic and anodic electrophoretic coating of metal materials in various industries such as automobiles, motorcycles, bicycles, aviation, and building materials.

4. The main application products in the oxidation industry include hard anodizing power supply and aluminum oxidation coloring power supply. This product is a specialized power supply for anodizing and coloring aluminum alloy materials. This power supply is designed based on the oxidation and coloring process requirements in the production of aluminum alloy profiles, digesting and absorbing advanced technology from similar products at home and abroad.

5. The main application products in the electrolysis industry include electrolysis power supply, electrolysis water hydrogen production power supply, electrolysis rare earth power supply, electrolysis fluorine production power supply, electrolysis copper foil switch power supply, suitable for surface polishing of hardware and plastic products, electrolysis of metals such as zinc, copper, aluminum, lead, gold, silver, metal refining electrolysis, hydrogen energy electrolysis, etc.

The main application product in the hydrogen production industry is the electrolysis water hydrogen production power supply. This electrolysis water hydrogen production power supply can improve the efficiency of the electrolysis power supply, effectively reduce the output voltage of the power supply, reduce the energy consumption of the electrolysis tank, and further improve the efficiency of the hydrogen production system.

The main application product of the electrolytic copper foil industry is the electrolytic copper foil power supply. The electrolytic copper foil is made through the electrolysis process, in which copper ions are reduced to copper atoms under the action of a DC electric field, and crystallize on the cathode to form copper foil. This process requires a stable and efficient power supply to ensure the quality and consistency of the copper foil.

8. The electrolysis fluorine gas industry electrolysis hydrogen fluoride fluorine gas power supply is a power supply equipment specially designed for electrolysis hydrogen fluoride, which can provide stable and adjustable DC current to promote the generation of fluorine gas.

9. The battery charging industry. The battery charging power supply can automatically replenish the required energy for the battery based on its own electricity consumption, and can adjust the charging voltage of the battery at different environmental temperatures. It can automatically determine the battery's under charge, open circuit, and full value situation.

10. Special power supply for rare earth smelting in the rare earth smelting industry is used for rare earth smelting. The input voltage of the power supply has a wide adaptability range, good energy-saving effect, and low pollution to the power grid.