AG7 battery!What is the principle of high frequency switching power supply circuit?

What is the principle of high-frequency switching power supply circuit? - Under high-frequency working conditions, the electromagnetic conversion speed of the transformer is fast. When converting the same energy, the energy stored in the transformer per unit time can be greatly reduced, thereby greatly reducing the transformer's energy consumption. size and losses in the transformer, thereby reducing weight and improving efficiency.

What is switching power supply

The traditional method of converting alternating current into direct current is rectification, and the machine that performs this function is called a rectifier. The commonly used switching power supply now only completes the process of rectification, inversion at a higher frequency, and rectification again. Compared with traditional rectifier circuits, its advantages are small size, light weight, high conversion efficiency, stable power quality, etc.

High frequency switching power supply circuit

1. Main circuit

The entire process from AC grid input to DC output includes:

1. Input filter: Its function is to filter the clutter existing in the power grid, and also prevent the clutter generated by the machine from being fed back to the public power grid.

2. Rectification and filtering: directly rectify the grid AC power into smoother DC power for next-level conversion.

3. Inverter: Convert rectified DC power into high-frequency alternating current. This is the core part of 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 needs.

2. Control circuit

On the one hand, samples are taken from the output end and compared with the set standard, and then the inverter is controlled to change its frequency or pulse width to achieve output stability. On the other hand, based on the data provided by the test circuit and identified by the protection circuit, the inverter is provided The control circuit carries out various protection measures for the whole machine.

3. Detection circuit

In addition to providing various running parameters in the protection circuit, it also provides various display instrument information.

4. Auxiliary power supply

Provides power for all single circuits with varying requirements.

Principle of high frequency switching power supply

High-frequency switching power supply (also called switching rectifier SMR) operates at high frequency through MOSFET or IGBT. The switching frequency is generally controlled in the range of 50-100kHz to achieve high efficiency and miniaturization.

Under high-frequency working conditions, the electromagnetic conversion speed of the transformer is fast, so that when the same energy is converted, the energy stored in the transformer per unit time can be greatly reduced, thereby greatly reducing the size of the transformer and the losses in the transformer, thus starting To reduce weight and improve efficiency.

High frequency switching power supply function

(1) Communicate with the monitoring center through MODEM and telephone network, and read the information of high-frequency switching power supply from the communication port;

(2) Measure the output current and voltage of the module, DC bus current and voltage, output current and voltage of the power supply, battery charging and discharging current and voltage, etc.;

(3) Control the output current and steady current of the power supply, control the power on and off, etc.;

(4) Control the high-frequency switching power supply to realize automatic conversion of battery float charging and equalizing charging modes;

(5) Control the automatic or manual switching of the silicon chain to ensure the voltage stabilization accuracy of the control bus, thereby ensuring the reliability of microcomputer and transistor protection power and preventing protection malfunctions;

(6) Adjust the charging current limit value and the total output current steady current value;

(7) It has local and remote control modes, and uses password permission or prohibition to operate to enhance the reliability of system operation.

The role of high-frequency switching power supply in the electronics industry is huge. In the application of power electronics technology and various power supply systems, switching power supply technology is at the core. The realization of high-frequency, modular, digital and green switching power supplies will mark the maturity of these technologies and achieve the combination of high-efficiency power consumption and high-quality power consumption.
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