Switching power supply composition
Switching power supply roughly by the main circuit,
Control circuit, detection circuit, auxiliary power supply composed of four parts.
1, the main circuit
Inrush Current Limiting: Limits the inrush current on the momentary input of the power supply.
Input filter: its role is to filter the existence of clutter power grid and hinder the local noise generated by the clutter back to the grid.
Rectification and filtering: the grid AC power supply directly rectified into a more smooth DC.
Inverter: the rectifier DC into high-frequency AC, which is the core of high-frequency switching power supply.
Output rectification and filtering: According to the load needs, to provide a stable and reliable DC power supply.
2, control circuit
On the one hand from the output side of the sample, compared with the set value, and then to control the inverter, change its pulse width or pulse frequency, the output stability, on the other hand, according to the test circuit to provide data, the protection circuit identification, The control circuit performs various protection measures on the power supply.
3, detection circuit
Provide protection circuit is running a variety of parameters and a variety of instrument data.
4, auxiliary power supply
To achieve the power of the software (remote) to start, for the protection circuit and control circuit (PWM and other chips) work power supply.