Time-sliced modular pulse-width modulation circuit

Details Time-sliced modular pulse-width modulation circuit Time-sliced modular pulse-width modulation circuit

1991-12-24

1993-09-28

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328 58, 328 62, 377 39, H03K 504, H03K 515

Patent

active

052489000

ABSTRACT:
A PWM output device using time-multiplexing to create multiple time-bases from a common time-base counter and thereby supporting multiple PWM output signals capable of having different periods and duty cycles. A circulating timer shifts to provide various fundamental time-bases to each PWM module, which sets and resets its PWM output upon a proper state determined by a looping state counter. When the state counter reaches 0, it causes the circulating counter to increment and the state counter to reload. As the circulating counter shifts, it generates a plurality of values to be used as the fundamental timebases for the PWM modules. Each PWM module comprises a time-base match unit, a duty cycle control unit, and an output control unit. The time-base match unit in each individual PWM module determines when the time base produced by the circulating counter is valid by comparing its preset valid state value with the state value from the state counter. The duty cycle control unit determines when the PWM output should be set and reset so as to produce the duty cycle for each PWM output signal by comparing its preset value with the value of the circulating counter. The output control unit enables the PWM output signal when the state values are matched between the state counter and the preset state value and the duty cycle is validly triggered.

REFERENCES:
patent: 4870665 (1989-09-01), Vaughn
patent: 4881040 (1989-11-01), Vaughn
patent: 5045800 (1991-09-01), Kung
patent: 5177373 (1992-01-01), Nakamura

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