Electricity: power supply or regulation systems – Including a transformer or an inductor – Potential transformer
Patent
1995-12-13
1997-11-18
Berhane, Adolf
Electricity: power supply or regulation systems
Including a transformer or an inductor
Potential transformer
363 59, 361 42, 361111, H01F 4004, H02H 904, H02M 322
Patent
active
056891806
ABSTRACT:
A isolated power supply for protecting electrical devices from transient voltages and currents is disclosed. Specifically, the filter has a toroid and resistor which are used in conjunction with an isolator transformer. The transformer's secondary windings are coupled to the electrical load sought to be isolated. The primary windings of the transformer are tied to an alternating current source with an earth ground lead. The primary shield lead of the transformer is tied to the earth ground lead. The secondary shield lead of the transformer is also tied to the earth ground. A toroid inductor and resistor in parallel are coupled between the secondary neutral lead and the secondary ground lead to shunt off current or voltage spikes. The earth ground is part of a chassis which prevents spark jump insuring the isolation of the power source. The isolator thus provides equal voltage potential between the secondary lead and the primary earth ground at frequencies of less than 1 kHz.
REFERENCES:
patent: 3963975 (1976-06-01), Gauper, Jr. et al.
patent: 4573098 (1986-02-01), Williston
patent: 4882646 (1989-11-01), Genuit
patent: 5448443 (1995-09-01), Muelleman
Understanding Grounding Contamination, Charlotte Andres, Power Solutions & Applications, Lake Bluff, Illinois, Power Quality Assurance, Jul./Aug., 1995.
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