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Title: Electrical power supplies
Claims: I claim: 1. An electrical power supply arranged to provide an alternating voltage output, said power supply comprising: an a.c. input source; a pair of transductors or saturable reactors having their output windings connected in phase opposition in series with the input source and the output; inverter means for supplying the input windings of the transductors with a constant d.c. control current independent of the output so as to operate in the forced magnetization mode thereby providing a constant current source with a high output impedance, the output current being set by the control current; and means for compensating "transfer admittance" in the d.c. control circuit, said compensating means comprising a transistor coupled in series with the transductors or reactors; a resistor in parallel with the series connected transistor and said transductors or reactors; means adapted to control the current through the resistor to be proportional to the input supply voltage, said transistor arranged so that the combined current through the resistor and the transductors or reactors is constant thereby causing the d.c. control current to be reduced when the input supply voltage increases. 2. An electrical power supply for providing energy to the anode and the filament of a magnetron, said power supply comprising: an a.c. input source; an output transformer connected to the anode of said magnetron; a pair of transductors or saturable reactors having their output windings connected in phase opposition in series with the input source and the output transformer; inverter means for supplying the input windings of the transductors or reactors with a constant d.c. control current independent of the output so as to operate in the forced magnetization mode thereby providing a constant current source with a high output impedance, the output current being set by the control current; and a transformer connected across said transductors or reactors to supply the filament energy for said magnetron. 3. An electrical power supply arranged to provide an alternating voltage output, said power supply comprising: an a.c. input source; a pair of transductors or saturable reactors having their output windings connected in phase opposition in series with said input source and said output, the control windings of said pair of transductors or saturable reactors being connected in series phase additive manner; invertor means for supplying said series connected control windings with a constant d.c. control current independent of the output so as to operate said pair of transductors or saturable reactors in the forced magnetization mode; and semiconductor means for compensating "transfer admittance" in the d.c. control circuit to cause the d.c. control current to be reduced when the voltage of said input source increases thereby providing a constant output current source having a high output current source having a high output impedance and having an output current magnitude set by the magnitude of the control current. 4. An electrical power supply as claimed in claim 3, wherein the frequency of operation of the inventer is up to 30 KH.sub.z. 5. An electrical power supply as claimed in claim 3, wherein the output is connected to a fluorescent lamp. 6. An electrical power supply as claimed in claim 3, wherein the output is connected via an output transformer to the anode of a magnetron. Other info: Inventors: Butterworth, Michael Lord (Bognor Regis, EN) Application Number: 415931 Filing Date: 1973-11-15 Publication_date: 1976-02-03 Assignee: Weir Electronics Limited (EN) Primary Class(es): 327/540 307/401, 315/224, 315/279, 323/302, 327/538 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Shoop, William M. Assistant Examiner: Attorney: Ostrolenk, Faber, Gerb & Soffen |
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