# US 4,397,147 A · Power circuit utilizing self excited Hall effect switch means

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- Number: US 4,397,147 A
- Document ID: US4397147A
- Status: Granted
- Kind: A
- Application number: 06/189,237
- Filed: 1980-09-22
- Granted: 1983-08-09
- Earliest claimed: 1980-09-22
- Assignees: The United States of America as represented by the Secretary of the Air Force
- Inventors: Peter J. Turchi
- Web page: https://patentgrep.com/patent/US4397147A

## CPC

- F03H 1/0018: {Arrangements or adaptations of power supply systems (for cosmonautic vehicles B64G1/42)}
- F03H: PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR (from combustion products F02K)

## Abstract

A power circuit utilizing a switch comprised of Hall-effect-active resistive elements for interrupting a current flow in an inductive energy storage system. Interruption of the flow of current causes a high-voltage pulse which drives the current flow into a circuit leg which is parallel to the interrupting elements. The Hall effect switch is controlled by means of an exciter coil that is connected in parallel with the Hall-effect-active resistive elements to provide self excited operation.

## Claims

### Claim 1

In a plasma thruster having arc jet electrodes, a current source and a power circuit including a spark gap connecting said current source to said arc jet electrodes, the improvement residing in a Hall effect switch means, said Hall effect switch means comprising
a self excited Hall effect switch connected across said power circuit and in parallel with said spark gap, said Hall effect switch comprising
Hall effect active element means having terminals for connection into said power circuit to effect the passage of electrical current through said Hall effect active element means, and
magnetic field means including an exciter coil for providing a magnetic field perpendicular to the electrical current flow in said Hall effect active element means, said exciter coil being connected in parallel with said Hall effect active element means and controlling the magnitude of said perpendicular magnetic field in response to electrical current flowing through said exciter coil.

### Claim 2 (depends on 1)

A Hall effect power circuit as defined in claim 1 including resistor means in series with said exciter coil, said resistor means being sized to match the peak resistance of said Hall effect active element to the impedance of said spark gap.

### Claim 3 (depends on 2)

A Hall effect power circuit as defined in claim 2 including a second Hall effect switch means in series with said exciter coil.

### Claim 4 (depends on 3)

A Hall effect power circuit as defined in claim 3 including a high current contactor across said first and second input terminals.