Electrical power control apparatus and methods

Details Electrical power control apparatus and methods Electrical power control apparatus and methods

1989-10-24

1990-10-02

Wong, Peter S.

Electricity: power supply or regulation systems

External or operator controlled

Phase controlled switching using electronic tube or a three...

323911, 128908, 606 35, 606 42, A61B 1739, G05F 166

Patent

active

049610473

ABSTRACT:
Electrosurgery apparatus includes an r.f. power amplifier with an output to a patient electrode. The amplifier is controlled by the voltage of input signals from a control unit which receives a sample of the voltage and current of the output signal. The voltage and current signals are supplied to A/D converters to provide two digital signals that are used to address a look-up table in an EPROM and provide a digital output representative of impedance. A switch is set by the user to the desired mode/power curve and this provides a digital signal which together with the impedance signal is used to address a second look-up table in an EPROM which contains digital representations of the required output voltage of the amplifier to produce the desired power level. An adder compares the required voltage with a feedback of the actual voltage to produce an error signal that is supplied to the amplifier to control its output.

REFERENCES:
patent: 3952748 (1976-04-01), Kaliher et al.
patent: 4416277 (1983-11-01), Newton et al.
patent: 4498475 (1985-02-01), Schneiderman
patent: 4848335 (1989-07-01), Manes
patent: 4862889 (1989-09-01), Feucht

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