Four parts of switching power supply!

May 08, 2023

Switching power supply is a common auxiliary tool in modern homes, which is probably composed of the main circuit, control circuit, detection circuit, auxiliary power supply four major components.

1. Main circuit

Impact current limiting: Limits the impact current at the input side at the moment of power access.

Input filter: its effect is to worry about the existence of clutter in the grid to block the low frequency oscillation caused by the machine feedback back to the grid.

Rectifier and filter: The grid communicates AC power immediately to the smoother AC power rectifier.

Inverter power supply: the rectifier after the alternating current into high frequency AC current, it is a key part of high frequency switching power supply.

Output rectifier and filter: according to the load must, provide stable and reliable DC power supply.

2. Control circuit

On the one hand, the inverter is sampled from the output end, compared with the preset value, and then manipulated to change its pulse width or pulse frequency, so that the output is stable. On the other hand, according to the data information provided by the detection circuit and identified by the maintenance circuit, the control circuit is provided to carry out various safeguard measures on the power supply.

3. Test the circuit

Provide a variety of key parameters and a variety of dashboard data information already in operation in the maintenance circuit.

4. Auxiliary power supply

Keep the power of the mobile phone software (remote control) start, for the maintenance circuit and control circuit (PWM and other integrated ic) work in the power supply system.

At present, technical engineers in the switching power supply technical industry are developing and designing related power electronic devices, while developing and designing the principle of power switching frequency converter. The two promote each other to promote the switching power supply towards the direction of light, small, thin, low noise, high reliability and anti-interference with the annual growth rate of more than two large numbers. Switching power supplies can be divided into AC/DC and DC/DC.

Switching power supply has been popularized and miniaturized. Switching power supply will gradually replace all the use of transformer in daily life. The use of small switching power supply with low output power should first be reflected in digital display meters, smart meters, mobile phone charging and other levels. At present, the country is vigorously developing the infrastructure of intelligent power grid, and the regulations on electricity meters have been greatly improved. The switching power supply will gradually replace the transformer in the use of electricity meters.

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