The input of the DC power supply is the mains voltage of 220V. Under normal circumstances, the value of the required DC voltage is very different from the effective value of the grid voltage. Therefore, it is necessary to reduce the voltage through the power transformer before processing the AC voltage. The rms value of the transformer secondary voltage depends on the needs of the subsequent circuit. In practice, transformers may not be used, but other methods may be used.
The voltage on the secondary side of the transformer is converted into a DC voltage through a rectifier circuit, that is, a sine wave voltage is converted into a unidirectional pulsating voltage. Since the rectified voltage contains a large AC component, it will affect the normal operation of the load circuit and cannot be used directly. In order to reduce the ripple of the voltage, it needs to be filtered by a filter circuit (capacitor) to smooth the output voltage. Ideally, all AC components should be filtered out so that the output voltage of the filter circuit is only DC voltage. However, since the filter circuit is a passive circuit, the filter effect will be affected after being connected to the load. For electronic circuits that do not require high stability, the rectified and filtered DC voltage can be used as a power supply.
Although the AC voltage becomes a DC voltage with a small AC component after rectification and filtering, when the grid voltage fluctuates or the load changes, its average value will also change. The function of the voltage regulator circuit is to make the output DC voltage basically free from the influence of grid voltage fluctuations and load changes, so as to obtain sufficiently high stability [1]
DC Power supply 30V 10A White color Link:
Pls Clink Below Photo and Read more details about this DC Power supply 30V 10A White color:
