Circuit for and method of decreasing conducted and radiated electromagnetic interference of a power converter and a full bridge power converter employing the same
First Claim
1. For use in a power converter having a controlled full bridge coupled to a transformer, said bridge delivering power received from an input of said power converter to a primary winding of said transformer, a circuit for decreasing conducted and radiated electromagnetic interference of said power converter, comprising:
- a switching circuit, coupled across at least a portion of said primary winding, that closes to short said portion as a function of a state of said full bridge to stabilize a voltage level of said primary winding.
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Accused Products
Abstract
For use in a power converter having a controlled full bridge coupled to a transformer, the bridge delivering power received from an input of the power converter to a primary winding of the transformer, a circuit for, and method of decreasing conducted and radiated electromagnetic interference of the power converter. In one embodiment, the circuit includes a switching circuit, coupled across at least a portion of the primary winding, that closes to short the portion as a function of a state of the full bridge to stabilize a voltage level of the primary winding and reduce ringing caused by the intrinsic capacitance, thereby decreasing the conducted and radiated electromagnetic interference.
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Citations
20 Claims
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1. For use in a power converter having a controlled full bridge coupled to a transformer, said bridge delivering power received from an input of said power converter to a primary winding of said transformer, a circuit for decreasing conducted and radiated electromagnetic interference of said power converter, comprising:
a switching circuit, coupled across at least a portion of said primary winding, that closes to short said portion as a function of a state of said full bridge to stabilize a voltage level of said primary winding. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. For use in a power converter having a controlled full bridge coupled to a transformer, said bridge delivering power received from an input of said power converter to a primary winding of said transformer, a method of decreasing conducted and radiated electromagnetic interference of said power converter, comprising the steps of:
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closing a switching circuit coupled across at least a portion of said primary winding; and shorting said portion as a function of a state of said full bridge to stabilize a voltage level of said primary winding. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A power converter, comprising:
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a full bridge, coupled to an input of said power converter; a pulse width modulation (PWM) controller, coupled to said full bridge, to provide PWM control signals thereto; a transformer, coupled to said full bridge, to receive power from said full bridge into a primary winding thereof; and a circuit for decreasing conducted and radiated electromagnetic interference of said power converter, including; a switching circuit, coupled across at least a portion of said primary winding and controlled by said controller, that closes to short said portion as a function of a state of said full bridge to stabilize a voltage level of said primary winding. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification