Computer-based controller and bipolar PWM driver arrangement for

Details Computer-based controller and bipolar PWM driver arrangement for Computer-based controller and bipolar PWM driver arrangement for

1988-11-25

1991-02-05

Lall, Parshotam S.

Boots, shoes, and leggings

364556, 324140R, 324146, G06F 900

Patent

active

049910981

ABSTRACT:
A control arrangement including a computer-based controller and bipolar driver for bidirectional current control of air core gauge coils by pulse-width-modulation (PWM). The computer-based controller processes input information to determine the desired deflection of the pointer, and looks-up previously stored PWM duty cycle commands for energizing the gauge coils. The bipolar drivers modulate the polarity of the voltage applied to the coils in accordance with the duty cycle commands. Since the drivers are bipolar, a zero strength magnetic field vector is achieved with a duty cycle command of 50 percent. This eliminates discontinuities in the region of zero strength magnetic field vector, and avoids the requirement of generating duty cycles of 0 percent and 100 percent to achieve a full 360 degrees of pointer deflection. Potential discontinuities in the generation of the duty cycles due to input data processing requirements is eliminated by scaling the duty cycles into the range of (DELTA)% to (100-DELTA)%.

REFERENCES:
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patent: 4051434 (1977-09-01), Sweet
patent: 4167699 (1979-09-01), Baker
patent: 4230984 (1980-10-01), Taylor
patent: 4355279 (1982-10-01), Younge
patent: 4630043 (1986-12-01), Haubner et al.
patent: 4862365 (1989-08-01), Onesti
patent: 4875041 (1989-10-01), Dannenberg

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