Variable voltage convert system with reduced bypass diode conduction
First Claim
Patent Images
1. 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.
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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.
20 Citations
20 Claims
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1. A vehicle powertrain comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A vehicle powertrain comprising:
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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. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification