Variable carrier switching frequency control of variable voltage converter
First Claim
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1. An electric vehicle power conversion system comprising:
- a variable voltage converter, including a capacitor, configured to generate an output voltage for a load; and
a controller configured to select a rate of change direction for the output voltage based on a current flow direction of the capacitor, and to adjust a magnitude of the rate of change direction based on the current flow direction and a load current flow direction.
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Abstract
A controller is configured to select a rate of change direction of an output voltage of a variable voltage converter (VVC) based on a direction of current flow associated with a capacitor of the VVC, and to adjust a magnitude of the rate of change direction based on directions of current flow associated with the capacitor and an electric machine coupled to the VVC.
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Citations
17 Claims
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1. An electric vehicle power conversion system comprising:
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a variable voltage converter, including a capacitor, configured to generate an output voltage for a load; and a controller configured to select a rate of change direction for the output voltage based on a current flow direction of the capacitor, and to adjust a magnitude of the rate of change direction based on the current flow direction and a load current flow direction. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A vehicle comprising:
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an electric machine; a variable voltage converter, including a capacitor, configured to produce a voltage for the electric machine; and a controller configured to select a positive rate of change direction for the voltage in response to a current flow direction being into the capacitor, and to decrease a magnitude of the rate of change direction in response to the current flow direction and an electric machine current flow direction being same. - View Dependent Claims (9, 10, 11)
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12. A controller-implemented method for operating an electric powertrain DC-DC converter coupled with an electric machine comprising:
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selecting a rate of change direction of an output voltage of the converter based on a current flow direction of a capacitor of the converter; and adjusting a magnitude of the rate of change direction based on the current flow direction of the capacitor and a current flow direction of the electric machine. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification