DC power supply is a device that maintains a constant voltage and current in a circuit. Such as dry batteries, storage batteries, dc generators, etc.

generator load bank
 

The DC power supply is mainly composed of the following four parts:

1. Ac voltage conversion part: the DC voltage required by general electronic equipment is much different from the 220V voltage provided by the AC power grid. In order to get the rated range of output voltage, it is necessary to convert the power grid voltage to the appropriate value. Therefore, the main task of the voltage conversion part is to change the grid voltage into the required AC voltage, but also can play a role in the isolation of THE DC power supply and the grid.

2. Rectifier department: the function of the rectifier circuit is to convert the converted AC voltage into the pulsating voltage in one direction. Because this voltage has a large pulsation component, it can not be directly used to power the electronic load, otherwise, the change of ripple will seriously affect the performance of the electronic load circuit.

3. Voltage regulator: although the voltage is close to the DC voltage after rectification and filtering, the stability of the voltage value is very poor. It is greatly affected by temperature, load, grid voltage fluctuation and other factors, so it is necessary to have a voltage regulator circuit to maintain the basic stability of the output DC voltage.

4. Filtering part: the filtering part is used to smooth the pulsating DC output from the rectifier part and make it a DC voltage with very small alternating components. In other words, the filter part is actually a low-pass filter with good performance, and its cutoff frequency must be lower than the fundamental frequency of the rectifier output voltage.