Mailing machine including multiple channel pulse width modulated

Details Mailing machine including multiple channel pulse width modulated Mailing machine including multiple channel pulse width modulated

1992-12-01

1994-07-19

Smith, Jerry

Boots, shoes, and leggings

318 35, 318599, G05B 1128

Patent

active

053315391

ABSTRACT:
Apparatus for generating a plurality of pulse width modulated signals for separately driving a plurality of electrical loads, comprising, a microprocessor, a plurality of comparator means, each of the comparator structure including first and second input terminals and an output terminal, digital to analog converter structure connected to the microprocessor for control thereby, the converter structure including a plurality of output terminals respectively connected to a different comparator structure first terminal for providing separate control signals thereto, structure for generating a reference voltage signal having a variable amplitude, the signal generating structure connected to each of the comparator structure second terminals for providing the reference voltage signal thereto, a plurality of power amplifiers, a plurality of electrical loads respectively connected to a different comparator structure output terminal via a different power amplifier for receiving therefrom an amplified comparator structure output signal, the microprocessor programmed for selectively addressing the converter structure output terminals, the microprocessor programmed for generating said separate control signals, and each of the comparator structure responsive to a different separate control signal and said variable reference voltage signal for modulating the pulse width of a comparator structure output signal to drive the power amplifier and thus the electrical load connected thereto.

REFERENCES:
patent: 4665353 (1987-05-01), Salazar et al.
patent: 4785224 (1988-11-01), Pfalzgraf et al.

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