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Wide-range positive-negative adjustable high-voltage DC power supply and the control method thereof

  • US 10,312,812 B2
  • Filed: 08/11/2017
  • Issued: 06/04/2019
  • Est. Priority Date: 08/11/2016
  • Status: Active Grant
First Claim
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1. A wide-range positive-negative adjustable high-voltage DC power supply, comprising a high-voltage generator, a negative high-voltage terminal, a positive high-voltage terminal, a first driving circuit, a first voltage regulating unit, a current detection and amplification circuit, a second driving circuit, a second voltage regulating unit, and an adjustable high-voltage output terminal;

  • as well as an instruction input terminal, an instruction voltage circuit, an error amplifier and a voltage feedback circuit;

    whereinthe high-voltage generator is respectively connected to the positive high-voltage terminal and the negative high-voltage terminal, the positive high-voltage terminal is connected to the input terminal of the first voltage regulating unit, the negative high-voltage terminal is connected to the input terminal of the second voltage regulating unit, the output terminal of the first voltage regulating unit is connected to the output terminal of the second voltage regulating unit and then to the adjustable high-voltage output terminal, the output terminal of the first driving circuit is connected to the driving terminal of the first voltage regulating unit, the current detection terminal of the first voltage regulating unit is connected to the detection input terminal of the current detection and amplification circuit, the output terminal of the current detection and amplification circuit is connected to the input terminal of the second driving circuit, and the output terminal of the second driving circuit is connected to the driving terminal of the second voltage regulating unit;

    the first voltage regulating unit and the second voltage regulating unit cooperate in a push-pull mode;

    the instruction input terminal, the instruction voltage circuit and the error amplifier are connected in turn, wherein the output terminal of the error amplifier is connected to the input terminal of the first driving circuit, the input terminal of the voltage feedback circuit is respectively connected to the output terminal of the first voltage regulating unit and the output terminal of the second voltage regulating unit, and the output terminal of the voltage feedback circuit is connected to the error amplifier;

    wherein the first voltage regulating unit comprises m PNP transistors Q1-1, Q1-2, . . . Q1-m, m+1 resistors R1-0, R1-1, R1-2, . . . R1-m, and one Zener diode D1-1;

    the first voltage regulating unit also comprises an input terminal, an output terminal, a current detection terminal and a driving terminal;

    wherein m≥

    1 and m is an integer;

    collectors and emitters of the m PNP transistors are connected to each other in series in turn, wherein the emitter of the first PNP transistor Q1-1 is connected to the anode of the Zener diode D1-1, the cathode of the Zener diode D1-1 is connected to one electrode of the current detection terminal of the first voltage regulating unit, the other electrode of the current detection terminal is connected to the input terminal of the first voltage regulating unit, one terminal of the resistor R1-0 is connected to one electrode of the driving terminal of the first voltage regulating unit, the other electrode of the driving terminal is connected to the input terminal of the first voltage regulating unit, the other terminal of the resistor R1-0 is connected to the base of the PNP transistor Q1-1, the two terminals of the resistor R1-m are respectively connected to the base and collector of the PNP transistor Q1-m, the collector of the PNP transistor Q1-m is also connected to the output terminal of the first voltage regulating unit, and the remaining m-1 resistors are respectively connected across the bases of the m transistors connected in series in turn.

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