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Precision voltage regulator for capacitor-charging power supply

  • US 6,114,842 A
  • Filed: 10/26/1999
  • Issued: 09/05/2000
  • Est. Priority Date: 10/26/1999
  • Status: Expired due to Term
First Claim
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1. A precision voltage regulator for a capacitor-charging power supply with a load capacitor comprising:

  • a main shunt device having first and second terminals connected across first and second outputs of the power supply;

    an isolation device having first and second terminals, the first terminal of the isolation device connected to the first output of the power supply and first terminal of the main shunt device;

    a current sensor connected in series with the first output of the power supply, to sense an output current of the power supply, the current sensor having an output signal proportional to the output current;

    a precision shunt and load resistor connected in series across the terminals of the load capacitor;

    a voltage sensor to sense the voltage across the load capacitor;

    a precision differential amplifier having an input from the voltage sensor;

    an analog program voltage;

    a precision comparator with first input from the voltage sensor and second input comprising the combination of the analog program voltage and the output signal of the current sensor; and

    a shunt controller to enable main shunt device and precision shunt device substantially simultaneously, the precision shunt device remaining enabled until the hysteresis of the precision comparator is satisfied.

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