Detailed description of the construction principle of stable DC power supply
The working principle of a transformer is based on the law of electromagnetic induction for the conversion of voltage, current and impedance. When building a DC regulated power supply, the power transformer usually converts the single-phase AC voltage of 220V to a lower AC voltage to meet the requirements of the following circuits. Determine the number of sockets on the secondary side of the power transformer and the voltage and wattage each socket should provide, based on the DC voltage and current values required by the circuit. In addition, in order to reduce the volume and weight of the power transformer, a high-frequency power transformer should be selected.
Using the unidirectional conductivity of a diode to convert an AC voltage to a DC unidirectional voltage is called rectification. In the actual design, the appropriate rectification method should be selected according to the output accuracy and the required quality characteristics of the power supply produced.
When designing a DC regulated power supply, the AC voltage can be filtered by the following characteristics: The voltage across the energy storage elements (such as inductors and capacitors) cannot suddenly change to a DC output with less fluctuation. The filtered DC power output always contains more AC components, so it cannot be applied directly across the load and must be stabilized.
