Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1992-09-08
1994-12-20
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 31, 363 58, H02H 300, H02H 7122
Patent
active
053750284
ABSTRACT:
Free wheeling diodes are protected against an overcurrent. When counter electromotive forces E.sub.VU and E.sub.WU established in a tri-phase motor cause regenerative currents I.sub.V1 and I.sub.W1 to flow to transistors Q4 and Q6, and to a protection diode D2, it is decided that the protection diode D2 is in overcurrent state. In response to the decision, the transistors Q4 and Q6 are turned off, which allows that regenerative currents I.sub.V2 and I.sub.W2 flow in protection diodes D3 and D5 because of the counter electromotive forces E.sub.VU and E.sub.WU. The energies of the regenerative currents I.sub.V2 and I.sub.W2 are regenerated at a capacitor C. Thus, since a regenerative current which once passed by only one protection diode is divided into two current flows into two protection diodes, the overcurrent state is terminated.
REFERENCES:
patent: 4430682 (1984-02-01), Babsch
patent: 4559486 (1985-12-01), Spencer et al.
patent: 4626766 (1986-12-01), Musil
patent: 4777576 (1988-10-01), Buikema
patent: 5053940 (1991-10-01), Peppel
patent: 5214525 (1993-05-01), Sugishima et al.
Patent Abstracts of Japan, vol. 14, No. 425, Sep. 13, 1990, JP-A-2-164-223, Jun. 25, 1990.
Gaffin Jeffrey A.
Leja Ronald W.
Mitsubishi Denki & Kabushiki Kaisha
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