US 5,070,538 AGranted

Wide band domino effect high voltage regulator

AssigneeThe United States of America as represented by the Secretary of the Air Force

InventorsWalter E. Milberger, Charles S. Kerfoot, Franklin B. Jones

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Abstract

The high voltage regulator employs a field effect transistor (FET) amplifier and a wide band frequency compensated RC voltage divider. The device comprises a FET amplifier used as a current source in a 20 KV power supply. The negative output of the supply is sensed by a voltage divider consisting of two resistors in parallel with two capacitors. The voltage divider output is applied to the non-inverting input of an operational amplifier whose reference is set to affect the linear operation of an inverting operational amplifier. A no load to full load and line regulation of 0.1% is provided to a microwave tube. For a 16-KV regulated output the inverting amplifier must have a dc operation point of 4 KV to accommodate a 20% storage capacitor voltage droop and a .+-.5% line change. At this level the inverting amplifier provides a swing of .+-.4 KV. This range allows for a large line voltage variation and storage capacitor voltage droop. The dynamic range and bandwidth of the regulator not only provides regulation for long term line voltage regulation but also negates the effects of line voltage transitions over a wide frequency and amplitude range.

A wide band high voltage regulator used with a high voltage power supply feeding a load, the high voltage power supply having first and second terminals for supplying direct current, with the load coupled between the first terminal and ground;

wherein said wide band high voltage regulator comprises a domino effect amplifier, a voltage divider, and an operational amplifier;
wherein said domino effect amplifier comprises N stages in tandem from a first stage to an Nth stage, each stage being a three-terminal unit having an input terminal, an output terminal and a common terminal, input means coupled between the input and common terminals of the first stage, the input means being coupled to an external signal source to provide an input signal to the first stage, the output terminal of the Nth stage being coupled via current-limiting means to the second terminal of said high-voltage power supply;
each stage after the first having its input terminal coupled to the common terminal of the preceding stage, and its common terminal coupled to the output terminal of the preceding stage;
each stage comprising an amplifying device having an inverting input, a non-inverting input and an output, a reference resistor connected between the input terminal of each stage and the non-inverting input of each amplifying device, a feedback resistor connected between the inverting input and the output of the amplifying device, the non-inverting input of each amplifying device being the common terminal of the stage, and the output of each amplifying device being the output terminal of each stage;
wherein said voltage divider is connected from the first terminal of the high voltage power supply to ground and has a tap near the ground end;
said operational amplifier has a non-inverting input, an inverting input, and an output, with its non-inverting input coupled to the tap of the voltage divider, its inverting input coupled to ground, and its output coupled to said input means of the domino effect amplifier.

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Abstract

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