A Simple DC Stabilizer Circuit with Diodes and Its Fault Handling — SUNMATE

A Simple DC Stabilizer Circuit with Diodes and Its Fault Handling

Diode simple voltage stabilizing circuits are mainly used in some local DC voltage supply circuits. Due to their simplicity and low cost, they are widely used. The diode simple voltage stabilizing circuit mainly utilizes the constant voltage drop characteristics of the diode.

The voltage drop characteristics of the diode: After the diode is turned on, its voltage drop remains basically unchanged. For silicon diodes, this voltage drop is about 0.6V, and for germanium diodes, it is about 0.2V.

As shown in the figure, it is a simple DC voltage stabilizing circuit composed of three ordinary diodes. The VD1, VD2, and VD3 in the circuit are ordinary diodes that are connected in series to form a simple DC voltage stabilizing circuit.

1. Explanation of circuit analysis ideas

Analyzing the working principle of a circuit that has never been seen before is difficult, especially for beginners with incomplete basic knowledge.

The main analysis ideas for this circuit are as follows.

1) From the circuit, it can be seen that three diodes are connected in series. According to the characteristics of the series circuit, if these three diodes are connected, they will be connected simultaneously, and if they are cut off, they will be cut off simultaneously.

2) According to the principle of judging whether the diode is conducting, there is a much higher voltage connected to the positive pole of the diode than to the negative pole, whether it is DC or AC voltage. At this time, the diode is in a conducting state. From the circuit, it can be seen that the positive pole of VD1 is connected to the DC working voltage+V in the circuit through resistor R1, and the negative pole of VD3 is grounded. This adds a sufficient forward DC voltage to the three series diodes. From this analysis, it can be seen that the three diodes VD1, VD2, and VD3 conduct under the action of DC operating voltage+V.

3) From the circuit, it can also be seen that there is no AC signal voltage added to the three diodes because there is a large capacity capacitor C1 connected between the positive pole of VD1, point A in the circuit, and the ground, bypassing any AC voltage at point A to the ground.