Principle and application field of high frequency switching power supply
Publisher: Administrator Date：2021-03-05
With the application of power systems, high-frequency switching power supplies have received more innovation and development. Under the premise of understanding the development trend of high-frequency switching power supplies, let us first become familiar with the principles of high-frequency switching power supplies.
1. Principle of high frequency switching power supply circuit
The high frequency switching power supply is composed of the following parts:
1. The main circuit, the whole process of input from AC grid and output from DC, including:
1>Input filter: Its function is to filter the clutter that exists in the power grid, and it also prevents the clutter generated by the machine from being fed back to the public power grid.
2>Rectification and filtering: Directly rectify the AC power of the grid into a smoother DC power for the next stage of transformation.
3>Inverter: Convert the rectified direct current into high-frequency alternating current, which is the core part of the high-frequency switching power supply. The higher the frequency, the smaller the ratio of volume, weight and output power.
4>Output rectification and filtering: Provide stable and reliable DC power supply according to load requirements.
2. Control circuit
On the one hand, take it out from the output terminal, compare it with the set standard, and then control the inverter to change its frequency or pulse width to achieve stable output; on the other side, according to the data provided by the test circuit, it is identified by the protection circuit and provided The control circuit carries out various protective measures to the rectifier.
3. Detection circuit
The sinker provides various operating parameters in the protection circuit, as well as various display instrument data.
4. Auxiliary power supply
Provide all the different requirements power of a single circuit.
Second, the principle of high frequency switching power supply voltage regulation
The main circuit of the high-frequency switching power supply will filter the clutter that exists in the grid, and also prevent the clutter generated by the machine from being fed back to the public grid, and then directly rectify the grid AC power into a smoother DC power for the next stage of conversion. Then convert the rectified DC power into high-frequency AC power. If different frequencies and bandwidths are needed, it can be obtained by controlling the inverter through the control circuit. Finally, according to the needs of the load, a stable and reliable DC power supply is provided. At the same time, the control circuit can adjust the The machine carries out various protective measures.
3. Application field of high frequency switching power supply
Electroplating, electrolysis, electrochemistry, oxidation, electrophoresis, smelting, surface treatment, water treatment, environmental protection, communications, heating, experiments, aging and other fields, and are widely used in private industries such as aluminum oxidation, hard oxidation, hard chromium electroplating, electrolytic copper, etc. And domestic aluminum wheel electroplating, piston ring chromium plating, nickel mesh casting plating, gasoline engine, diesel engine starting power supply, special power supply for train charging, rare earth electrolysis, etc.