Power supply having tuned radio frequency circuit

Details Power supply having tuned radio frequency circuit Power supply having tuned radio frequency circuit

1985-04-25

1987-03-17

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363132, H02P 1320

Patent

active

046512713

ABSTRACT:
A tuned circuit radio frequency power supply is disclosed. A conventional voltage doubler drives a power oscillator having a variable output frequency and variable duty cycle. The power oscillator output is connected to a tuned RLC circuit incorporating a load. A voltmeter coupled to the circuit measures overall phase of the RLC circuit and inputs to a phase comparator within the oscillator. Tuning of the RLC circuit is done by frequency comparison with circuit lead requiring increased oscillator frequency and circuit lag requiring decreased oscillator frequency. An ammeter is placed in series with the neon circuit and controls the oscillator duty cycle to maintain constant current despite changes in load. Consequently, power is adjusted from the oscillator, preferably by varying trigger level on a ramp voltage generator. In the case of a neon lamp power supply, there results a light weight power supply having a small radio frequency inductance which strikes the neon lamp, maintains the neon lamp at minimum energy levels, adjusts the lamp to various changes in operating parameters and lessens fire danger and minimizes radio frequency interference. In the case of conventional power supplies there is a power supply which does not require choking, has low switching losses and utilizes a small and compact step-down transformer as illustrated.

REFERENCES:
patent: 4493017 (1985-01-01), Kammiller et al.
NASA, "Frequency-Controlled Voltage Regulator", NASA Tech Briefs, Summer 1980.

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