Series regulator power supply principle - Power Circuit - Circuit Diagram

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Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

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One-piece inductor

The series regulator circuit is one of the most commonly used electronic circuits. It is widely used in various electronic circuits and has three manifestations.
1. As shown in Figure 1, this is the simplest series regulator circuit (some books call it a parallel regulator circuit, I personally think it should be a series regulator), resistor RL is the load resistor, R For the regulation of the regulator, there is a current limiting resistor, and D is a voltage regulator. The regulation value of this circuit output is equal to the nominal regulation value of D. Its working principle is realized by the characteristic that the Zener diode works in reverse breakdown. Figure 2 is the volt-ampere characteristic curve of the Zener tube. From this curve, we see that the voltage at the end point of the reverse current is substantially constant when the reverse current varies greatly within a certain range. When RL becomes smaller, the current flowing through RL increases, but the current flowing through D decreases. When RL becomes larger, the current flowing through RL decreases, but the current flowing through D increases, so due to the presence of D The current flowing through R is substantially constant, and the voltage drop across R is also substantially constant, so that the voltage at which it is output remains substantially unchanged.