Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1984-09-17
1987-06-02
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315399, H01J 2970, H01J 2976
Patent
active
046706925
ABSTRACT:
A high-speed power amplifier for driving inductive loads is capable of operating at frequencies of at least 270 kHz. The drive amplifier includes an oscillator that develops a continuous square-wave signal having relatively short transition times and a regulated 50% duty cycle. The oscillator output signal is applied to a filar-wound impedance transformer whose response time characteristics do not change substantially the transition time characteristics of the oscillator output signal. The impedance transformer circuit includes a pair of transistors operating in a push-pull configuration simultaneously to maintain the relatively short transition times of the oscillator output signal and to develop the high-current transformer output signal needed to drive a power transistor switch. The power amplifier is designed to provide a base current signal that promotes better dissipation of the power generated in the power transistor as it operates at high switching speeds. An exemplary embodiment of the power amplifier drives the yoke mechanism of the horizontal deflection circuitry of a display system employing a cathode ray tube. Operating the power amplifier at higher frequencies increases the degree of resolution of an image formed by such a display system.
REFERENCES:
patent: 3894270 (1975-07-01), Manske
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patent: 4028589 (1977-06-01), Verbeij
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patent: 4281275 (1981-07-01), Chapman et al.
patent: 4472662 (1984-09-01), Freed
J. Markus, Guidebook of Electronic Circuits, 1974, McGraw-Hill, Inc., p. 517, TK7867.M34, PWM for DC Motor Control Circuit.
Angello Paul S.
Blum Theodore M.
Tektronix Inc.
Winkelman John D.
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