Electricity: power supply or regulation systems – Output level responsive
Patent
1986-11-03
1988-01-12
Beha, Jr., William H.
Electricity: power supply or regulation systems
Output level responsive
315307, 356316, 356417, 363 97, G05F 110
Patent
active
047194030
ABSTRACT:
A constant current source for maintaining an essentially constant current flow through an r. f. glow discharge reaction occurring in a reactor uses a balancing capacitor, a center tap current transformer, a bridge circuit having two identical circuit legs, a differential amplifier, an error signal generating circuit, an operational amplifier, and voltage and current generator circuitry consisting of an oscillator, two transformers, MOS driver transistors and a filter circuit. Currents in the primary winding of the transformer caused by parasitic capacitance of the reactor and by the balancing capacitor effectively cancel each other out. This results in a voltage signal generated by the bridge circuit, which is coupled to the secondary winding of the transformer, that is proportional only to current flowing through the r. f. glow discharge reaction. This voltage signal is compared by the error signal generating circuit with a reference voltage which is proportional to a desired current level through the r. f. glow discharge reaction. The difference between the potential levels of the bridge generated voltage signal and the reference voltage is used to generate an error signal which changes an output voltage of the voltage and current generator circuitry so as to keep current flow through the r. f. glow discharge reaction essentially constant.
REFERENCES:
patent: 2967451 (1961-01-01), Farrall
patent: 4356433 (1982-10-01), Linden
Beha Jr. William H.
Cassett Larry R.
Konkol Chris P.
Swope R. Hain
The BOC Group Inc.
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