Inductive output tube (IOT) control circuit

Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation

Reexamination Certificate

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Details

C361S091100

Reexamination Certificate

active

10854968

ABSTRACT:
A power supply for an RF transmitting tube while protecting the tube from a high voltage arc event. The supply includes a rectifier circuit configured to be connected to an AC voltage supply and having an output circuit that supplies a DC voltage to a load including the tube and wherein the DC voltage may have a ripple voltage thereon. A control circuit is located intermediate the output circuit and the load for reducing any ripple voltage. The control circuit includes a series solid state switch that is connected in series between the rectifier circuit and the load. The control circuit also includes a reference capacitor coupled to the output circuit and to the load for supplying a reference voltage to the switch so that a voltage at the output circuit that exceeds the reference voltage will be clipped to reduce the voltage that is applied to the load.

REFERENCES:
patent: 5140229 (1992-08-01), Yagi et al.
patent: 5739643 (1998-04-01), Usui
patent: 5903110 (1999-05-01), Pol et al.
patent: 5910709 (1999-06-01), Stevanovic et al.
patent: 6194842 (2001-02-01), Canova
patent: 6272030 (2001-08-01), Oomura
patent: 6452343 (2002-09-01), Oostvogels et al.
patent: 6724153 (2004-04-01), See et al.
Harris BT-30U UHF Color Television Transmitter Technical manual a) Front cover of BT-30U UHF Color Television Transmitter Technical manual b) Selection of BT-30U Technical manual . . . General Description Circuit Description of primary power through Breakers, Contactor and power supply. Description of protection power through Breakers, Contactor and power supply. Description of protection circuits for over current. c) Selection of BT-30U Technical manual. Detailed Description Circuit description of primary power through breakers, relays, transformer, rectifier, L and C filter. Description of current overload circuits and removal of AC power via switch/relay. d) Fig. 7.3 of BT-30U Technical manual. Schematic showing switch, transformer, rectifier, filter, overload sensor and tube. e) Block Diagram of BT-30U Technical manual. Block Diagram showing switch, HV Power supply, current sensor and tube. f) Archived original document of Block diagram in 1e showing date of 1971.
g) Archived original document of schematic diagram in 1d showing date of 1975. h) Data sheet of Jennings vacuum contactor (high speed switch). i) Instruction manual of HV Power Supply. 1) Description of Filter with current limit. 2) Circuit Description of HV Power Supply stating that designer is not bounded in the selection of inductor or capacitor value. 3) Discussion of operation into a load with short circuit. 4) Discussion of series resistor to limit current. 5) Schematic of filter showing one possible configuration of Inductor, Capacitor and Resistor.
Maintaining Electronic Systems, by Jerry C. Whitaker, copyright 1991 by Multiscience Press, Inc., pages: cover sheet, second sheet and 281-325, all labeled as pp. 2-15.
Power Vacuum Tubes, by Jerry Whitaker, copyright 1994 by Multiscience Press, including cover sheet and first and second sheets and pp. 201-214, 301-307, all labeled as pp. 16-39; and.
Television Transmitters, By A. Hans Bott in National Association of Broadcasters, Engineering Handbook, Sixth Edition, copyright 1975 by the National Association of Broadcasters, Chapter 19, pp. 475-540, plus two cover pages.

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