Method of starting DC/DC converter using synchronous freewheeling MOSFET
First Claim
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1. A method of starting a DC/DC voltage converter, the converter comprising:
- an inductor and a low-side switch connected in a series conduction path, a Vx node being located in the series conduction path between the inductor and the low-side switch;
a freewheeling MOSFET connected in parallel with the inductor, a first body bias generator being connected between the source and drain terminals of the freewheeling MOSFET; and
an energy transfer switch connected between the Vx node and an output terminal of the converter, the energy transfer switch comprising an energy transfer MOSFET and a second body bias generator connected between the source and drain terminals of the energy transfer MOSFET;
the method comprising;
closing the freewheeling MOSFET and the energy transfer switch while maintaining the low-side switch in an open condition;
while maintaining the freewheeling MOSFET and the energy transfer switch in a closed condition and maintaining the low-side switch in an open condition, applying a DC input voltage to a first terminal of the inductor; and
turning off the energy transfer MOSFET when a voltage at the output terminal reaches a predetermined level, the predetermined level being less than the DC input voltage.
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Abstract
A DC/DC converter including an inductor and a capacitor is started by connecting an input voltage to the inductor and shunting a current around the inductor so as to pre-charge the capacitor to a predetermined voltage.
12 Citations
3 Claims
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1. A method of starting a DC/DC voltage converter, the converter comprising:
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an inductor and a low-side switch connected in a series conduction path, a Vx node being located in the series conduction path between the inductor and the low-side switch; a freewheeling MOSFET connected in parallel with the inductor, a first body bias generator being connected between the source and drain terminals of the freewheeling MOSFET; and an energy transfer switch connected between the Vx node and an output terminal of the converter, the energy transfer switch comprising an energy transfer MOSFET and a second body bias generator connected between the source and drain terminals of the energy transfer MOSFET; the method comprising; closing the freewheeling MOSFET and the energy transfer switch while maintaining the low-side switch in an open condition; while maintaining the freewheeling MOSFET and the energy transfer switch in a closed condition and maintaining the low-side switch in an open condition, applying a DC input voltage to a first terminal of the inductor; and turning off the energy transfer MOSFET when a voltage at the output terminal reaches a predetermined level, the predetermined level being less than the DC input voltage. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeAdvanced Analogic Technologies Incorporated (Skyworks Solutions Incorporated)
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Original AssigneeAdvanced Analogic Technologies Incorporated (Skyworks Solutions Incorporated)
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InventorsWilliams, Richard K.
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Primary Examiner(s)Behm, Harry
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Assistant Examiner(s)Grubb, Matthew
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Application NumberUS13/166,546Publication NumberTime in Patent Office468 DaysField of Search323/222, 323/223, 323/901, 323/908, 363/49US Class Current323/223CPC Class CodesH02M 3/158 including plural semiconduc...H02M 3/1582 Buck-boost converters H02M3...
