Method and apparatus for charge pulse-width modulation control

Details Method and apparatus for charge pulse-width modulation control Method and apparatus for charge pulse-width modulation control

1995-08-30

1996-08-27

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327304, 327 87, H03K 3017

Patent

active

055504981

ABSTRACT:
A charge mode pulse-width modulation control method and apparatus includes setting up a detector at a primary side of a transformer to detect a current and feeding back the detected current to a current apparatus to provide a current output; an integrator providing charge output with a voltage mode, where the charges are supplied by the integrator which takes the output current of current source to implement mathematical integration, and produce an output voltage and providing the output voltage to a main controller as a reference for deciding whether or not to switch a switch. The control system can prevent the transformer from reaching magnetic saturation and the feedback control current signal from generating noises.

REFERENCES:
patent: 3596172 (1971-07-01), Harrison
patent: 3766405 (1973-10-01), Armstrong
patent: 4336512 (1982-06-01), de Vries

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