Pulse width modulation control circuit
First Claim
1. A pulse width modulation circuit comprising:
- a sawtooth oscillating means for generating a sawtooth voltage after receiving a synchronizing signal;
a sawtooth controller for receiving said sawtooth voltage generated from said sawtooth oscillating means, receiving a reference voltage with respect to said sawtooth voltage, and outputting a current controlling constantly the amplitude of said sawtooth voltage to said sawtooth oscillating means; and
a pulse width modulating means for receiving an output voltage, also receiving a reference voltage with respect to said output voltage, then receiving said sawtooth voltage generated from said sawtooth oscillating means, and modulating pulse width of said sawtooth voltage.
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Accused Products
Abstract
A pulse width modulation control circuit of the present invention causes variation amplitudes of a sawtooth voltage in a sawtooth oscillator being synchronized by an external signal to be lowered thereby improving characteristics with respect to both a noise and a system control. The pulse width modulation control circuit includes a sawtooth oscillating means for generating a sawtooth voltage after receiving the synchronizing signal, that is, a synchronizing frequency; a sawtooth controller for receiving the sawtooth voltage generated from the sawtooth oscillating means, also receiving a reference voltage with respect to the sawtooth voltage, and outputting a current controlling constantly an amplitude of the sawtooth voltage to the sawtooth oscillating means; and a pulse width modulating means for receiving an output voltage, also receiving a reference voltage with respect to the output voltage, then receiving the sawtooth voltage generated from the sawtooth oscillating means 100, modulating a pulse width.
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Citations
4 Claims
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1. A pulse width modulation circuit comprising:
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a sawtooth oscillating means for generating a sawtooth voltage after receiving a synchronizing signal; a sawtooth controller for receiving said sawtooth voltage generated from said sawtooth oscillating means, receiving a reference voltage with respect to said sawtooth voltage, and outputting a current controlling constantly the amplitude of said sawtooth voltage to said sawtooth oscillating means; and a pulse width modulating means for receiving an output voltage, also receiving a reference voltage with respect to said output voltage, then receiving said sawtooth voltage generated from said sawtooth oscillating means, and modulating pulse width of said sawtooth voltage. - View Dependent Claims (2, 3, 4)
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Specification