Electricity: power supply or regulation systems – Remote sensing
Patent
1972-11-20
1976-12-07
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
317 31, 317 33VR, 321 18, 323 22T, 323 62, G05F 148
Patent
active
039965082
ABSTRACT:
A regulated three phase power supply with a wye connected, isolated neutral transformer having a full wave three phase bridge connected between the phase windings and the common point. A clipper transistor is connected across the bridge so that each phase current flows through the transistor. A drive circuit for the clipper transistor is isolated from ground. Reducing the drive to the clipper transistor increases its impedance and clips the voltage wave across the transformer primary. An output circuit is connected with the transformer. A three phase feedbck circuit is connected from either the output circuit or the wye connected circuit to the clipper transistor and is responsive to the instantaneous phase voltages to increase the transistor impedance, clipping the input voltage, when the sensed condition is excessive.
Current regulation is provided by increasing the drive to the transistor as the current through it increases. Overload and overvoltage sensing circuits increase the impedance of the clipping transistor in the event of an overload or transient overvoltage condition. A combination of delta and wye three phase, full wave rectified feedback circuits provide six phase feedback and a high efficiency of control. Plural outputs may be obtained from the transformer; and delta and wye output circuits can be connected to increase the ripple frequency.
REFERENCES:
patent: 3065399 (1962-11-01), McNamee
patent: 3113260 (1963-12-01), Wiley
patent: 3244962 (1966-04-01), Genuit
patent: 3343063 (1967-09-01), Keeney et al.
patent: 3375428 (1968-03-01), Mitchell
patent: 3408559 (1968-10-01), Bambace et al.
patent: 3514689 (1970-05-01), Giannamore
patent: 3582713 (1971-06-01), Till
patent: 3597655 (1971-08-01), Forte
patent: 3676766 (1972-07-01), Blackmond
Northrop Corporation
Pellinen A. D.
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