Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Patent
1996-05-03
1998-11-17
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
327172, H03K 3017
Patent
active
058381813
ABSTRACT:
A pulse-width modulator is disclosed which can be used, for example, in a power factor corrected electronic ballast circuit. The pulse-width modulator circuit combines a reference waveform signal with a second signal to form a composite waveform signal. The composite waveform signal is then compared with a reference voltage. The level of the pulse-width modulator's output depends upon the results of the comparison, such that a change in the level of the second signal causes an adjustment in the duty cycle of the output. In an electronic ballast application, the reference waveform can be a scaled version of the oscillator waveform found in the ballast's inverter circuit.
REFERENCES:
patent: 3097340 (1963-07-01), Dobbie
patent: 3365586 (1968-01-01), Billings
patent: 3586884 (1971-06-01), Bassmann
patent: 3712993 (1973-01-01), Edison
patent: 3731206 (1973-05-01), Veale
patent: 5550498 (1996-08-01), Kwan et al.
Microelectronic Circuits, Sedra et al., pp. (675-676), by Saunders College Publising, 1990.
Callahan Timothy P.
Lam T. T.
MagneTek, Inc.
Patterson Mark J.
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