Control of switching frequency based on difference in phase relations
AssigneeInfineon Technologies Austria AG
InventorMartin Feldtkeller
Life of this patent
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Abstract
In some examples, a method of controlling a first switch and a second switch of a resonant mode power converter circuit, the method comprising delivering control signals to the first switch and the second switch at a switching frequency. The method also comprises determining, for a first driving period, a first phase relation between a phase of a resonant current in the resonant mode power converter circuit and a phase of the control signals. The method further comprises determining, for a second driving period, a second phase relation between a phase of the resonant current and a phase of the control signals, and controlling the switching frequency based on a difference of the first phase relation and the second phase relation.
Claims20
A method of controlling a first switch and a second switch of a half-bridge circuit of a resonant mode power converter circuit, the method comprising:
- delivering control signals to the first switch and the second switch at a switching frequency;
- determining, for a first driving period, a first phase relation between a phase of a resonant current in the resonant mode power converter circuit and a phase of the control signals;
- determining, for a second driving period, a second phase relation between the phase of the resonant current and the phase of the control signals, wherein the first driving period and the second driving period are driving periods for the half-bridge circuit;
- and
- controlling the switching frequency based on a difference of the first phase relation and the second phase relation.
A controller device for controlling a first switch and a second switch of a half-bridge circuit of a resonant mode power converter circuit, the controller device comprising:
- at least two control pins configured to deliver control signals to the first switch and the second switch at a switching frequency;
- a sensing pin configured to sense a resonant current in the resonant mode power converter circuit;
- and
- processing circuitry configured to:
- determine, for a first driving period, a first phase relation between a phase of the resonant current and a phase of the control signals,
- determine, for a second driving period, a second phase relation between the phase of the resonant current and the phase of the control signals, wherein the first driving period and the second driving period are driving periods for the half-bridge circuit, and
- control the switching frequency based on a difference of the first phase relation and the second phase relation.
A resonant mode power converter circuit comprising:
- a half-bridge circuit including a first switch, a second switch, and an output node electrically connected to a load terminal of the first switch and a load terminal of the second switch;
- an LLC circuit including an inductor electrically connected to the output node of the half-bridge circuit, a primary side of a transformer electrically connected to the inductor, and a resonant capacitor electrically connected to the primary side of the transformer;
- an output capacitor arranged to receive an output voltage from a rectifier configured to rectify a voltage signal from a secondary side of the transformer;
- and
- a controller device including:
- driver circuitry configured to deliver control signals to the first switch and the second switch at a switching frequency, and
- processing circuitry configured to:
- determine, for a first driving period, a first phase relation between a phase of a resonant current in the LLC circuit and a phase of the control signals,
- determine, for a second driving period, a second phase relation between the phase of the resonant current and the phase of the control signals, and
- control the switching frequency based on a difference of the first phase relation and the second phase relation.
Dependencies are inferred from the claim text.