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US 12,273,024 B2Granted
Common mode electromagnetic interference mitigation
OwnerSeungdeog Choi, Ashik Amininventors
Life of this patent
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Abstract
A mechanism for mitigating electromagnetic interference (EMI) in a network of power converters is disclosed. A controller sends a first control signal to instruct a first power converter to generate a first EMI signal at a first phase. The controller sends a second control signal to instruct a second power converter to generate a second EMI signal at a second phase selected to destructively interfere with the first EMI signal at the first phase.
Claims17
A method comprising:
- coupling a controller to a circuit including a first power converter, wherein the first power converter is mounted to a first conductive base plate, wherein the first conductive base plate is connected to a heat sink, wherein the circuit further includes a second power converter, wherein the second power converter is mounted to a second conductive base plate, wherein the second conductive base plate is connected to the heat sink, and wherein the heat sink is connected to a common ground plane that is common to both the first power converter and the second power converter;
- controlling, by the controller coupled to the circuit, the first power converter to generate a first electromagnetic interference (EMI) signal having a first phase by controlling switching timing of the first power converter;
- and
- controlling, by the controller coupled to the circuit, the second power converter to generate a second EMI signal by controlling switching timing of the second power converter, the second EMI signal having a second phase that is selected based on the first phase and that is selected to reduce EMI in the circuit by destructively interfering with the first EMI signal at the first phase when the first EMI signal generated by the first power converter and the second EMI signal generated by the second power converter enter the common ground plane through the first and second conductive base plates and the heat sink.
1 more element
A controller configured to:
- couple to a circuit including a first power converter and, wherein the first power converter is mounted to a first conductive base plate, wherein the first conductive base plate is connected to a heat sink, wherein the circuit further includes a second power converter, wherein the second power converter is mounted to a second conductive base plate, wherein the second conductive base plate is connected to the heat sink, and wherein the heat sink is connected to a common ground plane that is common to both the first power converter and the second power converter;
- control the first power converter to generate a first electromagnetic interference (EMI) signal having a first phase by controlling switching timing of the first power converter;
- and
- control the second power converter to generate a second EMI signal by controlling switching timing of the second power converter, the second EMI signal having a second phase that is selected based on the first phase and that is selected to reduce EMI in the circuit by destructively interfering with the first EMI signal at the first phase when the first EMI signal generated by the first power converter and the second EMI signal generated by the second power converter enter the common ground plane through the first and second conductive base plates and the heat sink.
1 more element
A non-transitory computer readable medium comprising a computer program product for use by a controller, the computer program product comprising computer executable instructions stored on the non-transitory computer readable medium such that when executed by a processor cause the controller to:
- control a first power converter to generate a first electromagnetic interference (EMI) signal having a first phase by controlling switching timing of the first power converter, wherein the controller is coupled to a circuit including the first power converter, wherein the first power converter is mounted to a first conductive base plate, wherein the first conductive base plate is connected to a heat sink, wherein the circuit further includes a second power converter, wherein the second power converter is mounted to a second conductive base plate, wherein the second conductive base plate is connected to the heat sink, and wherein the heat sink is connected to a common ground plane that is common to both the first power converter and the second power converter;
- and
- control the second power converter to generate a second EMI signal by controlling switching timing of the second power converter, the second EMI signal having a second phase that is selected to reduce EMI in the circuit by destructively interfering with the first EMI signal at the first phase when the first EMI signal generated by the first power converter and the second EMI signal generated by the second power converter enter the common ground plane through the first and second conductive base plates and the heat sink.
Dependencies are inferred from the claim text.