BEMF rectification during power off to prevent parasitic effect

Details BEMF rectification during power off to prevent parasitic effect BEMF rectification during power off to prevent parasitic effect

1997-07-01

1999-03-16

Ip, Paul

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 318245, H02P 602

Patent

active

058834796

ABSTRACT:
A circuit and method to clamp a node of a power device connected to a driving node of a polyphase d-c motor to a reference potential during a powering off of the drive includes a current mirror and a comparator. A first input of the comparator is connected to the reference potential, and a second input is connected to the driving node. The reference potential may be a ground potential, or, preferably, the potential at another driving node of the motor. An output of the comparator is connected to a first side of the current mirror. A circuit is connected to apply a current reflecting the output of the comparator to a low side driver connected to the node.

REFERENCES:
patent: 4987352 (1991-01-01), Ishii
patent: 5191269 (1993-03-01), Carbolante
patent: 5374857 (1994-12-01), Carobolante
patent: 5589744 (1996-12-01), Brambilla
patent: 5656897 (1997-08-01), Carobolante et al.
patent: 5661382 (1997-08-01), Schlager et al.

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