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Isolated dual bus hybrid vehicle drivetrain

  • US 10,618,423 B2
  • Filed: 09/15/2017
  • Issued: 04/14/2020
  • Est. Priority Date: 09/15/2017
  • Status: Active Grant
First Claim
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1. A powertrain for a vehicle comprising:

  • a Y-wound generator and a Y-wound motor, each having phase windings coupled between phase terminals and a neutral terminal, wherein the Y-wound generator and the Y-wound motor are electrically coupled via each respective neutral terminal;

    a generator inverter coupled between the phase terminals of the Y-wound generator and generator bus terminals defining a generator bus;

    a motor inverter coupled between the phase terminals of the Y-wound motor and motor bus terminals defining a motor bus;

    a traction battery having a positive terminal coupled to the neutral terminals of the Y-wound generator and the Y-wound motor and a negative terminal coupled to one of the motor bus terminals and one of the generator bus terminals such that power flow to and from the traction battery is through the neutral terminals;

    a controller configured to modulate switches of the generator inverter and the motor inverter such that voltage levels of the generator bus vary independently of the motor bus, wherein the switches are insulated crate bipolar junction transistors or metal oxide semiconductor field effect transistors; and

    a generator controller configured to modulate switches of the generator inverter and a motor controller configured to modulate the switches of the motor inverter such that a generator phase frequency is independent of a motor phase frequency, wherein the motor phase frequency is at least twice the generator phase frequency and current flows from the positive terminal of the traction battery to the motor.

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