RMS power controller for dot-matrix printers

Details RMS power controller for dot-matrix printers RMS power controller for dot-matrix printers

1991-03-01

1993-02-23

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9329, B41J 230

Patent

active

051884658

ABSTRACT:
Method and apparatus for use with dot-matrix printers to ensure that the maximum heat dissipation of critical components associated with the printhead is not exceeded during high density printing. The number of dots to be printed are determined by a counting technique which takes into consideration the thermal time constant of a critical component and the filter time constant of the power controlling or supplying components. These considerations allow the counting of output dots to be accurately transformed by a single dot power conversion factor into an accurate representation of the power in the critical components. The dot counts are divided into time intervals dependent upon a filter time constant and a thermal time constant. The dot counts are squared, summed and rooted to produce an RMS value which accurately predicts the power which produces the heat dissipation in the critical components.

REFERENCES:
patent: 4236447 (1980-12-01), Matsuzaki et al.
patent: 4566813 (1986-01-01), Kobayashi et al.
patent: 4653940 (1987-03-01), Katsukawa
patent: 4705412 (1987-11-01), Matsumoto
Basic Circuit Theory by Desoer and Kuh 1969, pp. 321-322.
Pages 406-408 of "Basic Engineering Circuit Analysis".

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