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What is the specific principle of adding two resistors and two transistors to the resistor step-down circuit in the figure?

Hardware design
March 2, 2021 by Faris 112

What is the specific principle of adding two resistors and two transistors to this resistor step-down circuit? I haven't figured it out very well.

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Kirk Posted on March 2, 2021

These two transistors seem to be 400V withstand voltage tubes. The purpose here is one-stage step-down and one-stage regulation. One such transistor is used in a 220Vac circuit, which has the risk of withstand voltage.

    When the circuit meets certain conditions, it can be used - when the load is 0, two 47K chips have certain risks. At full load, two 56K particles have a greater risk of breakdown (two particles should be connected in series with about 15K or three particles in series with appropriate resistance). The specific safety range needs to be calculated.

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Kristy Posted on March 2, 2021

Connect in series, 56K*2 in parallel, two tubes, share the total pressure drop, and share some of the tube withstand voltage and power consumption.

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Stephon Posted on March 2, 2021

This is not a resistance-capacitance step-down voltage, the resistance-capacitance step-down capacitors are in series. This feeling is to use a transistor to build a high-voltage LDO.

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Michele Posted on March 2, 2021

The triode switch functions, and the resistor divides the voltage of the triode.

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