Switch mode sine wave driver for polyphase brushless permanent m

Details Switch mode sine wave driver for polyphase brushless permanent m Switch mode sine wave driver for polyphase brushless permanent m

1996-02-12

1998-08-25

Wysocki, Jonathan

Supports: cabinet structure

Knockdown or setup type

Foldable

318439, H02P 700

Patent

active

057986231

ABSTRACT:
A switch mode sine wave driver circuit selectively sources and sinks driving currents to and from a DC brushless motor in accordance with the substantially sinusoidal switched driving signals. A signal waveform monitoring circuit monitors electrical signals appearing the motor windings and puts out motor phase reference signals. A phase clock generator provides a motor-synchronized clock signal. A phase counter is clocked by the motor clock signal and is reset by the motor phase reference signals. The phase counter counts predetermined phase intervals and generates phase counts and phase polarity signals. A motor state decoder responds to the phase polarity signals by generating state control signals. Sine wave logic circuitry is addressed by the phase counts and puts out digital polyphase sine values for each one of the polyphases. A polyphase pulse width modulator circuit responds to the polyphase sine values by generating phase pulses having duty cycle duration controlled by the sine values. A logic decoder responds to the state control signals by decoding the phase pulses into phase driving pulses and by supplying the phase driving pulses to control a polyphase motor driver bridge circuit in order to rotate the motor.

REFERENCES:
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patent: 5530326 (1996-06-01), Galvin et al.

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