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US 9,178,440 B2Granted
Apparatus and method for resonant converters
AssigneeFuturewei Technologies, Inc.
InventorsDaoshen Chen, Heping Dai
Life of this patent
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Abstract
A method for improving a power converter's efficiency comprises providing a resonant converter, wherein the resonant converter comprises an input coupled to a power source, a plurality of power switches coupled to the input, a resonant tank coupled to the plurality of power switches and a controller coupled to the power switches and generating a plurality of gate drive signals for the power switches, wherein the gate drive signals are arranged such that a switching frequency of the resonant converter is in a frequency band.
Claims17
A converter comprising:
- an input coupled to a power source;
- a plurality of power switches coupled to the input;
- a resonant tank coupled to the plurality of power switches;
- and
- a controller coupled to the power switches, wherein the controller is configured to generate a plurality of gate drive signals for the power switches, and wherein the gate drive signals are arranged such that a switching frequency of the converter is in a frequency band, wherein the frequency band comprises an upper limit and a lower limit, and wherein the upper limit and the lower limit are adjacent to a resonant frequency of the resonant tank, and wherein the frequency band is determined through a control loop, and wherein a reference of the control loop is so arranged that the resonant frequency is within the frequency band, and wherein the reference follows a variable reference function, and wherein the variable reference function includes variables selected from the group consisting of an input voltage, an input current, an output voltage, an output current, an operating temperature.
2 more elements
A method comprising:
- providing a resonant converter, wherein the resonant converter comprises:
- an input coupled to a power source;
- a plurality of power switches coupled to the input;
- a resonant tank coupled to the plurality of power switches;
- and
- a controller coupled to the power switches;
- and
- generating a plurality of gate drive signals for the power switches, wherein the gate drive signals are arranged such that a switching frequency of the resonant converter is in a frequency band, wherein the frequency band comprises an upper limit and a lower limit, and wherein the upper limit and the lower limit are adjacent to a resonant frequency of the resonant tank, and wherein the frequency band is determined through a control loop, and wherein a reference of the control loop is so arranged that the resonant frequency is within the frequency band, and wherein the reference follows a variable reference function, and wherein the variable reference function includes variables selected from the group consisting of an input voltage, an input current, an output voltage, an output current, an operating temperature.
5 more elements
A method comprising:
- providing a resonant converter, wherein the resonant converter comprises:
- a power stage comprising:
- an input coupled to a power source;
- a plurality of power switches coupled to the input;
- a resonant tank coupled to the plurality of power switches;
- an isolation device coupled to the resonant tank;
- and
- an output coupled to the isolation device through a rectifier;
- and
- a control stage coupled to the power switches, wherein the control stage receives signals from both the input and the output;
- and
- generating a plurality of gate drive signals for the power switches, wherein the gate drive signals are arranged such that a switching frequency of the resonant converter is in a frequency band, wherein the frequency band comprises an upper limit and a lower limit, and wherein the upper limit and the lower limit are adjacent to a resonant frequency of the resonant tank, and wherein the frequency band is determined through a control loop, and wherein a reference of the control loop is so arranged that the resonant frequency is within the frequency band, and wherein the reference follows a variable reference function, and wherein the variable reference function includes variables selected from the group consisting of an input voltage, an input current, an output voltage, an output current, an operating temperature.
9 more elements
Dependencies are inferred from the claim text.