Slewing power supply for programmable phase shifter drive

• US 4,686,448 A
• Filed: 08/01/1986
• Issued: 08/11/1987
• Est. Priority Date: 08/01/1986
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Jones, Franklin B., Kerfoot, Charles S., Milberger, Walter E.
• Primary Examiner(s): Beha, Jr., William H.
• Application Number:
  US06/891,822
• Time in Patent Office: 375 Days
• Field of Search: 363/72, 323/212, 323/215, 323/267, 342/372, 342/377
• US Class Current: 323/212
• CPC Class Codes: G05F 1/468 characterised by reference voltage circuitry, e.g. soft start, remote shutdown
• CPC Class Codes: H02M 1/0029 Circuits or arrangements for limiting the slope of switching signals, e.g. slew rate
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators

Abstract

A programmable slewing power supply is used to drive microwave phase shifters according to a command signal from a system controller using: a Milberger converter; a power source; a rectifying circuit; two differential amplifier circuits; and two comparator amplifier circuits. The Milberger converter outputs a combined square wave which it produces by combining two independent square waves which add or cancel. The power source receives the combined square wave and outputs: a reference voltage, a positive voltage signal; and a negative voltage signal. The rectifying circuit produces a rectified command signal by rectifying the command signal from the system controller. The two differential amplifier circuits respectively measure the positive and negative voltage signals with respect to the reference voltage to produce a measured positive voltage signal, and a measured negative voltage signal. The comparator operational amplifiers produce complementary outputs to drive the phase shifters by respectively comparing the measured positive and negative voltage signals with the rectified command signal.

Claims

1. A slewing power supply, for use with a system controller which outputs voltage command signals which dynamically directs said slewing power supply to produce a responsive slewed output voltage to drive an inductive load, said slewing power supply comprising:

a Milberger converter which produces a combined square wave output signal composed of a positive voltage signal component and a negative voltage signal component;

a power source which outputs a reference voltage signal which is a floating base voltage, said power source also receiving said combined square wave output signal from said Milberger converter and separately outputting said positive voltage signal component and said negative voltage signal component; and

a means for regulating signals produced by said power source in accordance with said voltage command signals produced by said system controller, said regulating means being electrically connected with said power source and said system controller and outputting to said inductive load said responsive slewed output voltage in a form which comprises a first and second complementary voltage signal, said first complementary voltage signal being produced by respectively measuring said positive voltage signal component and said negative voltage signal component with said reference voltage signal to produce a measured positive voltage signal and a measured negative voltage signal, said regulating means then outputting said first and second complementary voltage signals by respectively comparing said measured positive voltage signal and said measured negative voltage signal with a rectified version of said voltage command signals, said regulating means producing said rectified version of said voltage command signals by rectifying said voltage command signals.

2. A slewing power supply, as defined in claim 1, wherein said regulating means comprises:

a means for rectifying said voltage command signals to produce said rectified voltage command signals;

a means for measuring said positive voltage signal component and said negative voltage signal component respectively with said reference voltage signal to produce said measured positive voltage signal and said measured negative voltage signal, said measuring means being electrically connected with said power source and receiving electrical signals therefrom;

first and second comparative operational amplifier circuits which are electrically connected to and receive said rectified voltage command signals from said rectifying means, said first comparative operational amplifier circuit producing said first complementary voltage signals by comparing said measured positive voltage signal, from said measuring means, with said rectified voltage command signals; and

said second comparative operational amplifier circuit producing said second complementary voltage signals by comparing said measured negative voltage signal, from said measuring means, with said rectified voltage command signals.

3. A slewing power supply, as defined in claim 2, wherein said measuring means comprises a first and second differential operational amplifier circuits which are electrically connected to and receive said reference voltage signal from said power source, said first differential operational amplifier circuit producing said measured positive voltage signal by measuring said positive voltage signal component, from said power source, with said reference voltage signal;

said second differential opertional amplifier circuit producing said measured negative voltage signal by measuring said negative voltage signal component, from said power source, with said reference voltage signal.

4. A slewing power supply as defined in claim 3, wherein said inductive load comprises a plurality of microwave phase shifters and said Milberger converter is capable of producing said combined square wave output signal with power above ten kilowatts and at frequencies of about 150 KHz to provide a high frequency D.C. to D.C. conversion which allows said first and second complementary voltage signals to track with said voltage command signals from said system controller.

5. A slewing power supply, as defined in claim 4, wherein said regulating means includes a slow start circuit which is electrically connected to and receives said first and second complementary voltage signals from said first and second differential operational amplifiers to control any power surges contained therein during an initial activation of slewing power supply.