High-efficiency DC/DC voltage converter including down inductive switching pre-regulator and capacitive switching post-converter
First Claim
1. A DC/DC voltage converter comprising:
- a step-down pre-regulator comprising a switched inductive circuit; and
a post-converter comprising a switched capacitive circuit,wherein an output terminal of the pre-regulator is coupled to an input terminal of the post-converter, an input terminal of the pre-regulator comprising an input terminal of the DC/DC voltage converter, an output terminal of the post-converter comprising an output terminal of the DC/DC voltage converter.
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Accused Products
Abstract
A DC/DC converter includes a pre-regulator stage, which may include a Buck converter, and a post-converter stage, which may include a charge pump. The duty factor of the pre-regulator stage is controlled by a feedback path that extends from the output terminal of the pre-regulator stage or the post-converter stage. The pre-regulator steps the input DC voltage down by a variable amount depending on the duty factor, and the post-converter steps the voltage at the output of the pre-regulator up or down by an positive or negative integral or fractional value. The converter overcomes the problems of noise glitches, poor regulation, and instability, even near unity input-to-output voltage conversion ratios.
211 Citations
19 Claims
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1. A DC/DC voltage converter comprising:
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a step-down pre-regulator comprising a switched inductive circuit; and a post-converter comprising a switched capacitive circuit, wherein an output terminal of the pre-regulator is coupled to an input terminal of the post-converter, an input terminal of the pre-regulator comprising an input terminal of the DC/DC voltage converter, an output terminal of the post-converter comprising an output terminal of the DC/DC voltage converter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of converting a first DC voltage to a second DC voltage comprising:
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providing at least one inductor and at least one capacitor; during a first time interval coupling a first terminal of the at least one inductor to the first DC voltage; during a second time interval coupling the first terminal of the at least one inductor to a second voltage, thereby producing an intermediate voltage at a second terminal of the at least one inductor; during a third time interval coupling a first terminal of the at least one capacitor to the intermediate voltage and coupling a second terminal of the at least one capacitor to a third voltage; and during a fourth time interval coupling the second terminal of the at least one capacitor to the intermediate voltage and coupling the first terminal of the at least one capacitor to an output terminal, thereby providing the second DC voltage at the output terminal. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of converting a first DC voltage to a second DC voltage comprising:
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providing at least one inductor and at least one capacitor; during a first time interval coupling a first terminal of the at least one inductor to the first DC voltage; during a second time interval coupling the first terminal of the at least one inductor to a second voltage, thereby producing an intermediate voltage at a second terminal of the at least one inductor; during a third time interval coupling a first terminal of the at least one capacitor to the intermediate voltage and coupling a second terminal of the at least one capacitor to a third voltage; and during a fourth time interval coupling the second terminal of the at least one capacitor to a fourth voltage and coupling the first terminal of the at least one capacitor to an output terminal, thereby providing the second DC voltage at the output terminal. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification