Digital pulse width modulator circuit with proportional dither

Details Digital pulse width modulator circuit with proportional dither Digital pulse width modulator circuit with proportional dither

1993-04-01

1995-07-11

Dougherty, Thomas M.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

323283, G05F 1575

Patent

active

054326931

ABSTRACT:
System and method for digitally generating a pulse width modulated (PWM) signal with dither based on a command signal, the signal having a pulse width proportional to the command signal. In the preferred embodiment, the PWM signal with proportional dither energizes a load, such as a variable force solenoid, with a desired electrical current. The system includes a base signal generator for generating a base signal having a pulse width which is based on a command signal representing the desired electrical current. The system also includes a dither signal generator for digitally generating a dither signal having a pulse width proportional to the command signal, and a summer for combining the base signal and the dither signal to obtain the pulse width modulated signal with proportional dither.

REFERENCES:
patent: 3970919 (1976-07-01), Butcher
patent: 4988942 (1991-01-01), Ekstrand
patent: 5079498 (1992-01-01), Cleasby et al.

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