Variable voltage convert system with reduced bypass diode conduction
AssigneeFord Global Technologies, LLC
InventorsMohammed Khorshed Alam, Lihua Chen, Yan Zhou, Fan Xu
Life of this patent
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Abstract
A vehicle powertrain includes a bypass diode and a controller. The bypass diode is configured to clamp an inverter DC terminal voltage to a battery voltage. The controller is configured to, while the terminal voltage is within a predetermined range of the battery voltage, maintain off a lower IGBT of a DC-DC converter while in a propulsion mode, and modulate the lower IGBT to increase the terminal voltage to maintain the bypass diode reverse biased while in a regenerative mode.
Claims20
A vehicle powertrain comprising:
- a bypass diode configured to clamp an inverter DC terminal voltage to a battery voltage;
- and
- a controller configured to, while the terminal voltage is within a predetermined range of the battery voltage, maintain off a lower IGBT of a DC-DC converter while in a propulsion mode, and modulate the lower IGBT to increase the terminal voltage to maintain the bypass diode reverse biased while in a regenerative mode.
A method of operating a DC-DC converter of a vehicle powertrain comprising:
- while a bus voltage is within a predetermined range of a battery voltage, by a controller
- maintaining in an on state an upper IGBT to enhance a channel from a battery to a load while in a propulsion mode;
- and
- modulating the upper IGBT to increase a current fluctuation magnitude through an inductor of the converter to reverse bias a converter bypass diode.
A vehicle powertrain comprising:
- a boost converter coupling a battery with an inverter;
- a bypass diode configured to clamp an inverter DC terminal voltage to a battery voltage;
- and
- a controller configured to, while operating the powertrain in a regenerative mode, modulate IGBTs of the boost converter to increase a current fluctuation magnitude through an inductor of the boost converter to shutoff the bypass diode by increasing an average of the inverter DC terminal voltage.
Dependencies are inferred from the claim text.