Maximum duty cycle limiting of pulse width modulators

Details Maximum duty cycle limiting of pulse width modulators Maximum duty cycle limiting of pulse width modulators

1989-10-18

1991-06-04

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 56, 363 97, 323280, H02M 114

Patent

active

050219375

ABSTRACT:
An apparatus is disclosed for maintaining accurate control of the maximum duty cycle generated by pulse width modulators. The output signal of a pulse width modulation comparator is averaged and compared to a reference value. This reference value is proportional to the peak value of the comparator's output voltage. A closed loop circuit continually adjusts the duty cycle so the difference between the reference value and the average comparator output is nulled thereby providing an accurate maximum duty cycle output.

REFERENCES:
patent: 3624486 (1971-11-01), Oates
patent: 4642748 (1987-02-01), Kirk
patent: 4791544 (1988-12-01), Gautherin et al.
patent: 4858094 (1989-08-01), Barlage

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