Industry Patents

Patent: 6903531

Circuit For Driving a Stepper Motor And Method Of Controlling A Stepper Motor Driver

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Patent Number:	6903531
Title:	Circuit For Driving a Stepper Motor And Method Of Controlling A Stepper Motor Driver
Abstract:	A driver circuit is provided for a stepper motor which utilizes a processor that outputs a PWM signal. The driver circuit includes an H-bridge circuit having first and second inputs, and a switching circuit having an input and an output. The first H-bridge input and the switching input connect to the PWM signal output from the processor, and the switching output connects to the second H-bridge input. The switching circuit performs an inversion of a duty cycle of the PWM signal when the PWM signal is present, and a non-inversion of the duty cycle when the PWM signal is not present.
Country of Issue:	US
First Named Inventor:	Suomi, Stankey
Assignee:	Electronic Theatre Controls
Continuation or Divisional of:
International Classification:	H02P 8/00
US Classification:	318/696
Issue Date:	06-07-2005
Filing Date:	09-05-2003
Application :	10/656517
Notes:
Link to Patent at freepatentsonline.com:	6903531 at Freepatentsonline
Link to World Patent Family¹:	World Patent Family at European Patent Office
Link to Google Patents¹:	6903531 at Google Patents

1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.

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