Control of an alternator-starter for a hybrid electric vehicle having a disconnected high-voltage battery
First Claim
1. An electric circuit for a hybrid powertrain system, comprising:
- a multiphase bridge inverter electrically connected to a high-voltage battery via positive and negative sides of a high-voltage DC power bus;
a multiphase asynchronous AC machine electrically connected to the multiphase bridge inverter;
a high-voltage DC link capacitor electrically connected between the positive and negative sides of the high-voltage DC power bus;
a low-voltage battery electrically connected to upper and lower gate drive bias power supplies; and
a plurality of gate drive pre-charge circuits, each electrically connected between one of the gate drive bias power supplies and the multiphase bridge inverter;
wherein the low-voltage battery electrically charges the high-voltage DC link capacitor via the upper and lower gate drive bias power supplies and the gate drive pre-charge circuits when a high-voltage switch disconnects the high-voltage battery from the high-voltage DC power bus.
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Accused Products
Abstract
A hybrid powertrain system includes an electric motor/generator unit having a multiphase asynchronous AC machine electrically connected to a multiphase bridge inverter. A high-voltage capacitor is electrically connected between positive and negative sides of a high-voltage DC power bus. High-voltage DC bus pre-charge circuits are electrically connected between gate drive bias power supplies and the multiphase bridge inverter. A low-voltage battery electrically charges the high-voltage DC link capacitor via the gate drive bias power supplies and the high-voltage DC bus pre-charge circuits when the high-voltage energy storage system is disconnected from the high-voltage DC power bus.
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Citations
17 Claims
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1. An electric circuit for a hybrid powertrain system, comprising:
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a multiphase bridge inverter electrically connected to a high-voltage battery via positive and negative sides of a high-voltage DC power bus; a multiphase asynchronous AC machine electrically connected to the multiphase bridge inverter; a high-voltage DC link capacitor electrically connected between the positive and negative sides of the high-voltage DC power bus; a low-voltage battery electrically connected to upper and lower gate drive bias power supplies; and a plurality of gate drive pre-charge circuits, each electrically connected between one of the gate drive bias power supplies and the multiphase bridge inverter; wherein the low-voltage battery electrically charges the high-voltage DC link capacitor via the upper and lower gate drive bias power supplies and the gate drive pre-charge circuits when a high-voltage switch disconnects the high-voltage battery from the high-voltage DC power bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electric circuit for a hybrid powertrain system, comprising:
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a multiphase bridge inverter electrically connected to a high-voltage battery via positive and negative sides of a high-voltage DC power bus; a multiphase asynchronous AC machine electrically connected to the multiphase bridge inverter; a high-voltage switch when closed electrically connects the high-voltage battery to the high-voltage DC power bus and when opened electrically disconnects the high-voltage battery from the high-voltage DC power bus; a high-voltage DC link capacitor electrically connected between positive and negative sides of the high-voltage DC power bus; a low-voltage auxiliary battery electrically connected to upper and lower gate drive bias power supplies providing DC electric power to a plurality of gate drive circuits, the gate drive circuits activating power transistors of the multiphase bridge inverter; and a plurality of gate drive pre-charge circuits, each electrically connected between a respective one of the upper and lower gate drive bias power supplies and the multiphase bridge inverter; wherein the low-voltage auxiliary battery electrically charges the high-voltage DC link capacitor to a preferred voltage level via the upper and lower gate drive bias power supplies and the gate drive pre-charge circuits when the high-voltage switch is opened. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. Method for operating a hybrid powertrain system comprising an internal combustion engine mechanically coupled to an electric motor/generator unit, the electric motor/generator unit electrically connected to a bridge inverter including a high-voltage DC power bus having a positive high-voltage DC bus and a negative high-voltage DC bus, a high-voltage battery selectively connectable to the high-voltage DC power bus via a high-voltage switch, and upper and lower gate drive bias power supplies providing DC electric power from a low-voltage battery to a plurality of gate drive precharge circuits, the method comprising:
when the high-voltage battery is disconnected from the high-voltage DC bus via the high-voltage switch, employing the low-voltage battery to electrically charge a capacitor between the positive high-voltage DC bus and the negative high-voltage DC bus with the upper and lower gate drive bias power supplies to establish an operational voltage of the motor/generator unit across the high-voltage DC bus; and spinning and operating the electric motor/generator unit in an electric power generating mode. - View Dependent Claims (17)
Specification