Permanent magnet surge arrestor for DC power converter

Details Permanent magnet surge arrestor for DC power converter Permanent magnet surge arrestor for DC power converter

1986-09-15

1988-02-02

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 93, 361133, 363137, 363139, H02H 7122

Patent

active

047231882

ABSTRACT:
An improved surge current limiting method and apparatus is provided for an inverter circuit. The inverter includes electronic switching devices serially connected between relatively positive and negative voltage buses and alternately conductive for providing alternating current paths through a load connected to a terminal intermediate the two switching devices. An inductor connected in series with the switching devices is provided with a permanent magnet core which is magnetically polarized in a direction such that current through the inductor attempts to reverse the magnetic polarity of the permanent magnet. The inductor is sized such that normal current through the inductor is not appreciably attenuated by the inductance. Under fault current conditions, the magnetic field generated by the higher currents through the inductor is opposed by the magnetic field of the permanent magnet so as to provide a substantial current limiting effect. The permanent magnet current limiting inductor may be used in various locations in an inverter circuit and may be applied to either single phase or multi-phase inverters.

REFERENCES:
patent: 3331011 (1967-07-01), Landis
patent: 4257080 (1981-03-01), Bartram et al.
patent: 4331994 (1982-05-01), Wirth

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