Circuits and methods to linearize conversion gain in a DC-DC converter
AssigneeTexas Instruments Incorporated
InventorsSujan K. Manohar, Angelo W. Pereira
Life of this patent
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Abstract
Described examples include DC-DC power conversion systems, apparatus and methods for linearizing a DC-DC circuit conversion gain, including a gain circuit providing an output signal according to a gain value and the difference between a first compensation signal and a threshold signal, and a switching circuit selectively operative when the first compensation signal exceeds the threshold signal to linearize the conversion gain by providing a second compensation signal for pulse width modulation of at least one DC-DC converter switch according to the threshold signal and the gain circuit output signal.
Claims20
A circuit, comprising:
- a comparator configured to generate an adjusted compensation signal when a first compensation voltage is greater than a linearization threshold voltage;
- and
- a switching circuit coupled to the comparator, and configured to generate a second compensation voltage responsive to the adjusted compensation signal, the second compensation voltage aggregating the first compensation voltage with a scaled difference between the first compensation voltage and the linearization threshold voltage.
A circuit, comprising:
- a comparator configured to assert a first mode signal when a first compensation voltage is less than a linearization threshold voltage, and assert a second mode signal when the first compensation voltage is greater than the linearization threshold voltage;
- and
- a switching circuit coupled to the comparator, and configured to:
- select the first compensation voltage when the first mode signal is asserted;
- and
- select a second compensation voltage when the second mode signal is asserted, the second compensation voltage aggregating the first compensation voltage with a scaled difference between the first compensation voltage and the linearization threshold voltage.
A circuit, comprising:
- a comparator configured to assert a first mode signal when a first compensation voltage is less than a linearization threshold voltage, and assert a second mode signal when the first compensation voltage is greater than the linearization threshold voltage;
- and
- a gain circuit configured to convert the first compensation voltage and the linearization threshold voltage to a first current and a second current respectively, and generate an output current scaling a differential current between the first and second currents by a non-zero gain value;
- and
- a switching circuit coupled to the comparator, and configured to:
- select the first compensation voltage when the first mode signal is asserted;
- and
- select a second compensation voltage when the second mode signal is asserted, the second compensation voltage summing the first compensation voltage with a scaled difference voltage based on the output current.
Dependencies are inferred from the claim text.