High-frequency generator with automatic power-control for high-f

Details High-frequency generator with automatic power-control for high-f High-frequency generator with automatic power-control for high-f

1987-02-06

1989-04-04

Grimm, Siegfried H.

Oscillators

Amplitude control or stabilization

Automatic

12830314, 12830317, 128422, A61B 1736, H03L 502

Patent

active

048189545

ABSTRACT:
A high-frequency generator having automatic power-control for use in high-frequency surgery. The frequency of a high-frequency generator is adjustable by electronic circuit brought by a control circuit to a value such that at the output of the power amplifier there is an optimal phase relation between output voltage and output current, i.e., generally a phase shift of zero. The signal necessary for the control of the output power is obtained from harmonic oscillations generated by the arc at the surgical probe. A harmonic-measuring device to obtain the harmonic oscillations generated by the arc at the surgical probe has a phase-controlled rectifier which is controlled by the oscillator of the high-frequency generator. A simple filter is used at the output of the power amplifier, and the measurement filter used before the harmonic-measuring device can either be completely eliminated or need only be very simple in construction. No complicated filter adjustment is necessary and the power generator operates under optimal conditions and exhibits enhanced operating reliability.

REFERENCES:
patent: 3601126 (1971-08-01), Estes
patent: 3875945 (1975-04-01), Friedman
patent: 4114623 (1978-09-01), Meinke et al.
patent: 4126137 (1978-11-01), Archibald
patent: 4559943 (1985-12-01), Bowers

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