Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1997-03-12
1998-08-11
Masih, Karen
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, 318798, 318799, 318800, 318801, 318802, 318803, 318804, 318805, 318806, 318807, 318808, 318809, 318810, 318811, 318812, 318813, 318814, 318815, 347247, H02K 2300
Patent
active
057931704
ABSTRACT:
In a motor drive circuit, the collector-emitter paths of two npn-type transistors are connected in series between a power line and ground, and the junction between the two transistors is connected to a motor coil. A control circuit feeds a control current to the base of the transistor connected to the power line so that this transistor supplies a drive current to the motor coil. A current mirror circuit is provided which is constituted of two pnp-type transistors whose emitters are connected to the power line, and the base and collector of the input-side transistor is connected to the control circuit through a diode. The base of another pnp-type transistor is connected to the cathode of the diode, and the emitter of this transistor is connected to the collector of the output-side transistor of the current mirror circuit and to the base of the transistor connected to the power line.
REFERENCES:
patent: 5264774 (1993-11-01), Ito
patent: 5523660 (1996-06-01), Fujii
patent: 5659230 (1997-08-01), Fukuoka
patent: 5677723 (1997-10-01), Soya et al.
Masih Karen
Rohm & Co., Ltd.
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