Switch Mode Power Supply (SMPS), also known as switching power supply and switching converter, is a kind of high frequency power conversion device and a kind of power supply. Its function is to convert a bit voltage through different forms of architecture to the required voltage or current of the client. The input of switching power supply is mostly AC power supply (e.g. municipal power) or DC power supply, while the output is mostly DC power equipment, such as personal computers, and the switching power supply converts the voltage and current between them. Basic Composition of Switching Power Supply



The switching power supply is mainly composed of main circuit and main circuit.
Switching Mode Power Supply
Control circuit, detection circuit and auxiliary power supply are composed of four parts.
1. Main Circuit
Impulse Current Limit: Limit the impulse current on the input side of the power supply at the moment of switching on.
Input filter: Its function is to filter the clutter existing in the power grid and hinder the local clutter feedback back to the power grid.
Rectification and filtering: Direct rectification of AC power supply in power grid into smooth DC power supply.
Inverter: Converting rectified DC to high frequency AC, which is the core part of high frequency switching power supply.
Output Rectifier and Filter: According to the need of load, provide stable and reliable DC power supply.
2. Control Circuit
On the one hand, the output is sampled from the output and compared with the set value, then the inverter is controlled to change its pulse width or pulse frequency, so as to stabilize the output. On the other hand, according to the data provided by the test circuit, the protection circuit identifies and provides the control circuit with various protection measures for the power supply.
3. Detection Circuit
Provides all kinds of parameters and instrumentation data that are in operation in the protection circuit.
4. Auxiliary Power Supply
Realize the software (remote) start of power supply, and supply power for protection circuit and control circuit (such as PWM chip).