Pulse-width-modulation control circuit
First Claim
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1. A pulse width modulation (PWM) controlling circuit comprising:
- an oscillator having a first output and a second output for outputting two synchronous signals with a predetermined phase shift therebetween;
a first RC delay network and a second RC delay network respectively connected to said first and second outputs of said oscillator, said first and second RC delay networks generating two narrow pulses with said predetermined phase shift therebetween;
a first PWM controller connected with said first RC delay network to receive one of said two narrow pulses to be triggered thereby; and
a second PWM controller connected with said second RC delay network to receive the other of said two narrow pulses to be triggered thereby.
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Abstract
A PWM controlling circuit includes a signal generator and two PWM controllers. The signal generator comprises an oscillator, a plurality of inverters, and two RC delay networks. The oscillator and the inverters are composed of elementary elements, respectively, such as diodes, resistors, inverters and capacitors. The PWM controlling circuit in accordance with the present invention can be implemented with low cost, and the duty cycles thereof are not limited to 50%.
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6 Claims
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1. A pulse width modulation (PWM) controlling circuit comprising:
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an oscillator having a first output and a second output for outputting two synchronous signals with a predetermined phase shift therebetween; a first RC delay network and a second RC delay network respectively connected to said first and second outputs of said oscillator, said first and second RC delay networks generating two narrow pulses with said predetermined phase shift therebetween; a first PWM controller connected with said first RC delay network to receive one of said two narrow pulses to be triggered thereby; and a second PWM controller connected with said second RC delay network to receive the other of said two narrow pulses to be triggered thereby. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification