DC-DC CONVERTER
First Claim
Patent Images
1. A DC-DC converter receiving an input voltage and generating an output voltage, comprising:
- an inductor;
a switch switching the input voltage to a first side of the inductor;
a comparator controlling initiation of closing the switch; and
,the first side of the inductor capacitively coupled to a first input of the comparator.
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Accused Products
Abstract
A DC-DC converter, having an input voltage and an output voltage, includes an inductor and a switch switching the input voltage to an input side of the inductor, where a feedback path controlling initiation of closing the switch includes capacitive coupling of the voltage at the input side of the inductor.
41 Citations
18 Claims
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1. A DC-DC converter receiving an input voltage and generating an output voltage, comprising:
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an inductor; a switch switching the input voltage to a first side of the inductor; a comparator controlling initiation of closing the switch; and
,the first side of the inductor capacitively coupled to a first input of the comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A DC-DC converter receiving an input voltage and generating an output voltage, comprising:
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a feedback path comparing a fraction of the output voltage to a first reference voltage; an amplifier receiving a fraction of the output voltage and a second reference voltage, and having an amplifier output that is the difference between the fraction of the output voltage and the second reference voltage; a threshold circuit determining whether the magnitude of the output of the amplifier is greater than a threshold; an integrator integrating the output of the amplifier only when the threshold circuit determines that the magnitude of the output of the amplifier is greater than the threshold; and
,an adder, adding an output of the integrator to the first reference voltage to adjust the first reference voltage. - View Dependent Claims (15)
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16. A method of controlling on-time and switching frequency of a switch in a DC-DC converter, the DC-DC converter having an input voltage and an output voltage, the method comprising:
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driving, by a voltage controlled current source, a capacitance, to generate a ramp voltage, the voltage controlled current source being controlled by the input voltage to the DC-DC converter; comparing, by a comparator, the ramp voltage to the output voltage of the DC-DC converter; controlling, by the comparator, a switch control circuit to close the switch in response to a trigger signal and to open the switch when the ramp voltage is greater than the output voltage; detecting, by a phase detector, a difference in phase between the output of the comparator and a reference frequency signal; driving, by the phase detector, a current generator; and
,adding the current generated by the current generator to the current generated by the voltage controlled current source.
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17. A DC-DC converter receiving an input voltage and generating an output voltage, comprising:
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an inductor; a first switch switching the input voltage to a first side of the inductor; a comparator controlling initiation of closing the first switch, the first side of the inductor coupled to a first input of the comparator; a second switch switching the first side of the inductor to ground; circuitry receiving the voltage at the first side of the inductor, receiving a state of the second switch, and controlling at least part of a signal path between the first side of the inductor and the first input of the comparator; and
,the circuitry configured to reduce signal strength from the first side of the inductor to the first input of the comparator when the circuitry determines that a discontinuous conduction mode (DCM) exists for the inductor.
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18. A DC-DC converter receiving an input voltage and generating an output voltage, comprising:
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an inductor; a first switch switching the input voltage to a first side of the inductor; a comparator controlling initiation of closing the first switch, the first side of the inductor coupled to a first input of the comparator; a differential difference amplifier having an output that is electrically coupled to the first input of the comparator; the differential difference amplifier having a first input electrically coupled to the output voltage; and
,the output of the differential difference amplifier offset by a bias voltage that is constant.
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Specification