Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1995-02-28
1997-03-11
Ip, Paul
Electricity: motive power systems
Limitation of motor load, current, torque or force
318138, 318254, H02K 2904, H02P 122
Patent
active
056104863
ABSTRACT:
A stator coil driver circuit for a brushless DC motor, with an improved current mirror, is disclosed. The improved current mirror has a first transistor which conducts current and a second transistor configured to mirror the current of the first transistor. Additionally, the improved mirror circuit includes a unity gain amplifier connected in between the gates of the first and second transistor. The effect of the unity gain transistor is to provide for a faster turn-off of the second transistor and reduce oscillation of the circuit.
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Arrambide Joseph C.
Galanthay Theodore E.
Ip Paul
Lager Irena
SGS-Thomson Microelectronics Inc.
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