Power converter employing a variable switching frequency and a magnetic device with a non-uniform gap
First Claim
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1. A power converter, comprising:
- a power switch;
a magnetic device coupled to said power switch and having a non-uniform gap, said magnetic device formed according to one of;
said magnetic device comprising a first core section and a second core section having a leg that forms a gap with said first core section and an end of said leg having a reduced cross-sectional area to form said non-uniform gap,said magnetic device comprising a first core section and a second core section having a leg that forms a gap with said first core section and an end of said leg having a hole bored therein to form said non-uniform gap,said magnetic device comprising a first core section and a second core section having a leg that forms a gap with said first core section and a core piecepart positioned at an end of said leg to form said non-uniform gap,said magnetic device comprising a first core section and a second core section having a leg with a tapered region at an end thereof to form said non-uniform gap with said first core section, andsaid magnetic device comprising a first magnetic core having first and second core sections, said second core section of said first magnetic core having a leg that forms a first gap with said first core section of said first magnetic core, and a second magnetic core adjacent said first magnetic core and having first and second core sections, said second core section of said second magnetic core having a leg that forms a second gap with said first core section of said second magnetic core, said first and second gaps forming said non-uniform gap; and
a controller, including;
a detector configured to sense a condition representing an output power of said power converter; and
a control circuit configured to control a switching frequency of said power switch as a function of said condition and control a duty cycle of said power switch to regulate an output characteristic of said power converter.
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Abstract
A power converter including a power switch, a controller for controlling a switching frequency thereof, and a magnetic device with a non-uniform gap. In one embodiment, the power converter includes a power switch and a magnetic device coupled to the power switch and having a non-uniform gap. The power converter also includes a controller having a detector configured to sense a condition representing an output power of the power converter. A control circuit of the controller is configured to control a switching frequency of the power switch as a function of the condition and control a duty cycle of the power switch to regulate an output characteristic of the power converter.
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Citations
20 Claims
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1. A power converter, comprising:
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a power switch; a magnetic device coupled to said power switch and having a non-uniform gap, said magnetic device formed according to one of; said magnetic device comprising a first core section and a second core section having a leg that forms a gap with said first core section and an end of said leg having a reduced cross-sectional area to form said non-uniform gap, said magnetic device comprising a first core section and a second core section having a leg that forms a gap with said first core section and an end of said leg having a hole bored therein to form said non-uniform gap, said magnetic device comprising a first core section and a second core section having a leg that forms a gap with said first core section and a core piecepart positioned at an end of said leg to form said non-uniform gap, said magnetic device comprising a first core section and a second core section having a leg with a tapered region at an end thereof to form said non-uniform gap with said first core section, and said magnetic device comprising a first magnetic core having first and second core sections, said second core section of said first magnetic core having a leg that forms a first gap with said first core section of said first magnetic core, and a second magnetic core adjacent said first magnetic core and having first and second core sections, said second core section of said second magnetic core having a leg that forms a second gap with said first core section of said second magnetic core, said first and second gaps forming said non-uniform gap; and a controller, including; a detector configured to sense a condition representing an output power of said power converter; and a control circuit configured to control a switching frequency of said power switch as a function of said condition and control a duty cycle of said power switch to regulate an output characteristic of said power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a power converter, comprising:
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providing a power switch; coupling a magnetic device having a non-uniform gap to said power switch, said magnetic device formed according to one of; said magnetic device comprising a first core section and a second core section having a leg that forms a gap with said first core section and an end of said leg having a reduced cross-sectional area to form said non-uniform gap, said magnetic device comprising a first core section and a second core section having a leg that forms a gap with said first core section and an end of said leg having a hole bored therein to form said non-uniform gap, said magnetic device comprising a first core section and a second core section having a leg that forms a gap with said first core section and a core piecepart positioned at an end of said leg to form said non-uniform gap, said magnetic device comprising a first core section and a second core section having a leg with a tapered region at an end thereof to form said non-uniform gap with said first core section, and said magnetic device comprising a first magnetic core having first and second core sections, said second core section of said first magnetic core having a leg that forms a first gap with said first core section of said first magnetic core, and a second magnetic core adjacent said first magnetic core and having first and second core sections, said second core section of said second magnetic core having a leg that forms a second gap with said first core section of said second magnetic core, said first and second gaps forming said non-uniform gap; sensing a condition representing an output power of said power converter; controlling a switching frequency of said power switch as a function of said condition; and controlling a duty cycle of said power switch to regulate an output characteristic of said power converter. - View Dependent Claims (17, 18, 19, 20)
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Specification