Power conversion device and control method for voltage equalization
AssigneeDelta Electronics, Inc.
InventorsChi-Lung Hsiao, Hui-Chung Hsieh
Life of this patent
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Abstract
A control method includes the following operations: combining multiple output voltages into a total output voltage; generating a first switching frequency based on a first voltage difference, and generating at least one offset frequency based on at least one second voltage difference; generating at least one second switching frequency according to the at least one offset frequency and the first switching frequency; and generating a first set of switching signals according to the first switching frequency, and generating at least one second set of switching signals according to the at least one second switching frequency to respectively control a switching element of the resonant converter circuits.
Claims17
A power conversion device, comprising:
- a plurality of resonant converter circuits, including a first converter circuit to a nth converter circuit, configured to generate a first output voltage to a nth output voltages respectively, wherein outputs of the plurality of resonant converter circuits are coupled in series, in order to combine the first output voltage to the nth output voltage into a total output voltage, and each of the plurality of resonant converter circuits comprises a set of switching elements, wherein n is an integer and n≥2;
- a controller configured to generate a first switching frequency based on a first voltage difference and to generate at least one offset frequency based on at least one second voltage difference,
- wherein the first voltage difference is a difference between the total output voltage and a first reference voltage, and the at least one second voltage difference is generated according to a mth output voltage, wherein n≥m≥2;
- a frequency processing circuit configured to generate at least one second switching frequency, wherein the at least one second switching frequency is generated by subtracting the at least one offset frequency from the first switching frequency;
- and
- a signal modulation circuit configured to generate a first set of switching signals according to the first switching frequency, and to generate at least one second set of switching signals according to the at least one second switching frequency, in order to respectively control the set of switching elements of the first converter circuit and a mth converter circuit.
A control method, comprising:
- combining a plurality of output voltages, including a first output voltage to a nth output voltage, from outputs of a plurality of resonant converter circuits, including a first converter circuit to a nth converter circuit, into a total output voltage, wherein the outputs of a plurality of resonant converter circuits are connected in series, wherein n is an integer and n≥2;
- generating a first switching frequency based on a first voltage difference, and generating at least one offset frequency based on at least one second voltage difference,
- wherein the first voltage difference is a difference between the total output voltage and a first reference voltage, and the at least one second voltage difference is generated according to a mth output voltage, wherein n≥m≥2;
- generating at least one second switching frequency according to the at least one offset frequency and the first switching frequency, wherein the at least one second switching frequency is generated by subtracting the at least one offset frequency from the first switching frequency;
- and
- generating a first set of switching signals according to the first switching frequency, and generating at least one second set of switching signals according to the at least one second switching frequency, in order to control a set of switching elements of the first converter circuit and a mth converter circuit.
Dependencies are inferred from the claim text.