SELF-OSCILLATING CONVERTER
First Claim
1. A self-oscillating converter including a load capacitor with a negligibly small equivalent series resistor and a feedback loop with a comparator to which a voltage difference between a reference voltage and an output voltage of the converter is applied, comprising:
- a first auxiliary feedback path from an output node to a first differential input of the comparator, the first auxiliary feedback path having a first RC time constant;
a second auxiliary feedback path from the output node to a second differential input of the comparator, the second auxiliary feedback path having a second RC time constant different from the first time constant; and
circuitry for adding the differential voltage between the first and second differential inputs to the voltage difference applied to the comparator.
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Accused Products
Abstract
A converter has a main feedback path and two auxiliary feedback paths from an output node to an auxiliary differential input pair of a comparator. The auxiliary feedback paths have different RC time constants so that a differential ramp signal is effectively applied to the auxiliary differential inputs of the comparator. The circuit design compensates for a negligibly small equivalent series resistor of an output capacitor so that modern capacitors may be used without compromising the stable oscillation of the converter.
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Citations
9 Claims
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1. A self-oscillating converter including a load capacitor with a negligibly small equivalent series resistor and a feedback loop with a comparator to which a voltage difference between a reference voltage and an output voltage of the converter is applied, comprising:
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a first auxiliary feedback path from an output node to a first differential input of the comparator, the first auxiliary feedback path having a first RC time constant; a second auxiliary feedback path from the output node to a second differential input of the comparator, the second auxiliary feedback path having a second RC time constant different from the first time constant; and circuitry for adding the differential voltage between the first and second differential inputs to the voltage difference applied to the comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification