Buck-boost DC—DC switching power conversion
First Claim
1. Apparatus for converting power from an input source at an input voltage for delivery to an output at an output voltage, comprising:
- first and second switches adapted to be connected to a first terminal of an inductor and a third switch adapted to be connected to a second terminal of the inductor,a switch controller adapted to operate the switches in a series of converter operating cycles, each converter operating cycle including,(i) an input (“
IN”
) phase during which the inductor is connected across the source for a time TIN,(ii) a input-output (“
IO”
) phase during which the inductor is connected between the source and the output for a time TIO,(iii) a free-wheel (“
FW”
) phase during which the inductor is connected across the output for a time TFW,(iv) a clamp (“
CL”
) phase during which the inductor is shorted for a time TCL,wherein the end of each converter operating cycle marks the beginning of another converter operating cycle.
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Accused Products
Abstract
Apparatus operates at a power level within a range of power levels that includes a rated maximum power level of the apparatus. The apparatus includes circuit elements to deliver power at an output voltage to a load from a source at an input voltage using an inductor selectively connected between the source and the load during a power conversion cycle. The inductor conducts a current having an average positive value during the power conversion cycle. A first switching device is interposed between the source and a first terminal of the inductor. A second switching device is interposed between a second terminal of the inductor and the load. A switch controller turns ON the first switching device during a time interval within the power conversion cycle during which the current is negative.
63 Citations
41 Claims
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1. Apparatus for converting power from an input source at an input voltage for delivery to an output at an output voltage, comprising:
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first and second switches adapted to be connected to a first terminal of an inductor and a third switch adapted to be connected to a second terminal of the inductor, a switch controller adapted to operate the switches in a series of converter operating cycles, each converter operating cycle including, (i) an input (“
IN”
) phase during which the inductor is connected across the source for a time TIN,(ii) a input-output (“
IO”
) phase during which the inductor is connected between the source and the output for a time TIO,(iii) a free-wheel (“
FW”
) phase during which the inductor is connected across the output for a time TFW,(iv) a clamp (“
CL”
) phase during which the inductor is shorted for a time TCL,wherein the end of each converter operating cycle marks the beginning of another converter operating cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 41)
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17. Apparatus for converting power from an input source at an input voltage for delivery to an output at an output voltage, comprising:
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first and second switches adapted to be connected to a first terminal of an inductor and a third switch adapted to be connected to a second terminal of the inductor, a switch controller adapted to operate the switches in a series of converter operating cycles, each converter operating cycle including; (i) an input (“
IN”
) phase during which the inductor is connected across the source for a time TIN,(ii) a input-output (“
IO”
) phase during which the inductor is connected between the source and the output for a time TIO,(iii) a free-wheel (“
FW”
) phase during which the inductor is connected across the output for a time TFW,wherein each converter operating cycle includes exactly one of each of the IN, IO, and FW phases, each IN, IO, and FW phase is uninterrupted, and the end of each converter operating cycle marks the beginning of another converter operating cycle; and wherein the inductor is connected across the source to initiate the IN phase at a time when a negative current is flowing in the inductor. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. Apparatus for converting power from an input source at an input voltage, where the input voltage may vary over a normal operating range between a minimum input voltage and a maximum input voltage, for delivery to an output at an output voltage, comprising:
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first and second switches adapted to be connected to a first terminal of an inductor and a third switch adapted to be connected to a second terminal of the inductor, a switch controller adapted to operate the switches in a series of converter operating cycles, each converter operating cycle including; (i) an input (“
IN”
) phase during which the inductor is connected across the source for a time TIN,(ii) a input-output (“
IO”
) phase during which the inductor is connected between the source and the output for a time TIO,(iii) a free-wheel (“
FW”
) phase during which the inductor is connected across the output for a time TFW,wherein, throughout the normal operating range, (a) each converter operating cycle includes exactly one of each of the IN, IO, and FW phases, (b) each IN, IO, and FW phase is uninterrupted, and (c) the end of each converter operating cycle marks the beginning of another converter operating cycle. - View Dependent Claims (34)
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Specification