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How does this series circuit realize the function similar to the voltage regulator tube?

Hardware design
10月 20, 2020 by Mila 1308

1. How do v2 and V3 of this circuit achieve similar functions as a Zener tube?

2. Is the output voltage of this circuit: Uin*[R1/(Rp+R2+R3)]+0.7V (Vbe of V1)? ? ?

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Emilia ポストする October 20, 2020

The function of the voltage regulator tube is replaced by the forward voltage drop of the V2 transmitting junction.

The forward voltage drop of the V2 transmitting junction is not as stable as the voltage regulator tube, so this circuit has poor voltage regulation characteristics.

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Arthur ポストする October 20, 2020

It's easy to understand things other than V1 R1 as a voltage regulator.

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Clayton ポストする October 20, 2020

As the "sofa" and "bench" said, this is the truth.

Now you can use a TL431 to replace the adjustable regulator tube composed of V2 V3, and the output voltage is stable.

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Aurora ポストする October 20, 2020

This is a regulator tube plus a secondary current, not a negative feedback regulator circuit, the combination of V2 and V3 acts as a regulator tube.

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