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US 10,239,407 B2Granted
Variable carrier switching frequency control of variable voltage converter
AssigneeFord Global Technologies, LLC
InventorsLan Yu, Michael W. Degner
Life of this patent
Estimating the term…
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.
Claims17
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.
A vehicle comprising:
- 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.
1 more element
A controller-implemented method for operating an electric powertrain DC-DC converter coupled with an electric machine comprising:
- 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.
Dependencies are inferred from the claim text.