Buck-boost regulator
First Claim
1. A buck-boost regulator for converting an input voltage to an output voltage, comprising:
- an inductor having a first end and a second end;
an error circuit which determines an error of the output voltage and which provides an error voltage indicative thereof;
a buck switching circuit which switches said first end of said inductor between the input voltage and ground as controlled by a buck pulse width modulation signal;
a buck ripple circuit which replicates ripple current through said inductor based on said buck pulse width modulation signal and which provides a buck ripple voltage indicative thereof;
a buck hysteretic comparator circuit which develops said buck pulse width modulation signal based on comparing said buck ripple voltage within a buck window voltage range between said error voltage and said error voltage combined with a buck window voltage;
a boost switching circuit which switches said second end of said inductor between the output voltage and ground as controlled by a boost pulse width modulation signal;
a boost ripple circuit which replicates ripple current through said inductor based on said boost pulse width modulation signal and which provides a boost ripple voltage indicative thereof; and
a boost hysteretic comparator circuit which develops said boost pulse width modulation signal based on comparing said boost ripple voltage within a boost window voltage range between said error voltage and said error voltage combined with a boost window voltage.
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Accused Products
Abstract
A buck-boost regulator for converting an input voltage to an output voltage which includes an inductor, an error circuit providing an error voltage, buck and boost switching circuits, buck and boost ripple circuits, and buck and boost hysteretic comparator circuits. The buck switching circuit switches a first end of the inductor, the buck ripple circuit replicates ripple current through the inductor based on the buck pulse signal and provides a buck ripple voltage, and the buck hysteretic comparator circuit develops the buck pulse signal based on a buck window voltage range using the error voltage. The boost switching circuit switches a second end of the inductor, the boost ripple circuit replicates ripple current through the inductor based on the boost pulse signal and provides a boost ripple voltage, and the boost hysteretic comparator circuit develops the boost pulse signal based on a boost window voltage range using the error voltage.
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Citations
21 Claims
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1. A buck-boost regulator for converting an input voltage to an output voltage, comprising:
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an inductor having a first end and a second end; an error circuit which determines an error of the output voltage and which provides an error voltage indicative thereof; a buck switching circuit which switches said first end of said inductor between the input voltage and ground as controlled by a buck pulse width modulation signal; a buck ripple circuit which replicates ripple current through said inductor based on said buck pulse width modulation signal and which provides a buck ripple voltage indicative thereof; a buck hysteretic comparator circuit which develops said buck pulse width modulation signal based on comparing said buck ripple voltage within a buck window voltage range between said error voltage and said error voltage combined with a buck window voltage; a boost switching circuit which switches said second end of said inductor between the output voltage and ground as controlled by a boost pulse width modulation signal; a boost ripple circuit which replicates ripple current through said inductor based on said boost pulse width modulation signal and which provides a boost ripple voltage indicative thereof; and a boost hysteretic comparator circuit which develops said boost pulse width modulation signal based on comparing said boost ripple voltage within a boost window voltage range between said error voltage and said error voltage combined with a boost window voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electronic device, comprising:
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a power source providing an input voltage which ranges between a minimum voltage and a maximum voltage; a load which receives a regulated source voltage having a voltage level which is greater than said minimum voltage and less than said maximum voltage; and a buck-boost regulator for converting said input voltage to said regulated source voltage, comprising; an inductor having a first end and a second end; an error circuit which determines an error of said regulated source voltage and which provides an error voltage indicative thereof; a buck switching circuit which switches said first end of said inductor between said input voltage and ground as controlled by a buck pulse width modulation signal; a buck ripple circuit which replicates ripple current through said inductor based on said buck pulse width modulation signal and which provides a buck ripple voltage indicative thereof; a buck hysteretic comparator circuit which develops said buck pulse width modulation signal based on comparing said buck ripple voltage with said error voltage; a boost switching circuit which switches said second end of said inductor between said regulated source voltage and ground as controlled by a boost pulse width modulation signal; a boost ripple circuit which replicates ripple current through said inductor based on said boost pulse width modulation signal and which provides a boost ripple voltage indicative thereof; and a boost hysteretic comparator circuit which develops said boost pulse width modulation signal based on comparing said boost ripple voltage with said error voltage. - View Dependent Claims (14, 15, 16, 17)
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18. A method of controlling a buck-boost regulator which converts an input voltage to an output voltage, comprising:
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switching a first end of an inductor between the input voltage and ground as controlled by a buck pulse width modulation signal; switching a second end of the inductor between the output voltage and ground as controlled by a boost pulse width modulation signal; determining an error of the output voltage and providing an error voltage indicative thereof; replicating ripple current through the inductor based on the buck pulse width modulation signal and providing a buck ripple voltage indicative thereof; replicating ripple current through the inductor based on the boost pulse width modulation signal and providing a boost ripple voltage indicative thereof; comparing the buck ripple voltage within a buck window voltage range and providing the buck pulse width modulation signal indicative thereof, wherein the buck window voltage range comprises a first voltage range between the error voltage and the error voltage combined with a buck window voltage; and comparing the boost ripple voltage within a boost window voltage range and providing the boost pulse width modulation signal indicative thereof, wherein the boost window voltage range comprises a second voltage range between the error voltage and the error voltage combined with a boost window voltage. - View Dependent Claims (19, 20, 21)
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Specification