Pi source inverter-converter for hybrid electric vehicles

Patent metadata

Field	Value
Publication number	US-10468968-B2
Application number	US-201815921284-A
Country	US
Kind code	B2
Filing date	Mar 14, 2018
Priority date	Mar 17, 2017
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A system for reducing a resonant oscillation on a direct current bus of a power inverter/converter for an electric machine having a variable frequency drive is disclosed. The system includes a battery, a first capacitor connected in parallel with the battery; an inductor connected in series with the first capacitor; a first diode connected in series with the inductor; a second diode connected in parallel with the inductor and the first diode; a second capacitor connected in series with the first diode; and a starter-generator connected to the second capacitor. During a re-generation mode for charging the battery, a re-generation current flows from the starter-generator to the battery, passing through the first diode and the inductor and bypassing the second diode. During a motor mode, a motor current flows from the battery to the starter-generator, passing through the second diode and bypassing the first diode and the inductor.

First claim

What is claimed is:

1. A system for reducing a resonant oscillation on a direct current bus of a power inverter/converter for an electric machine having a variable frequency drive, the system comprising:
a battery;
a first capacitor connected in parallel with the battery;
an inductor connected in series with the first capacitor;
a first diode connected in series with the inductor;
a second diode connected in parallel with the inductor and the first diode;
a second capacitor connected in series with the first diode; and
a starter-generator connected to the second capacitor;

wherein:
during a re-generation mode for charging the battery, a re-generation current flows from the starter-generator to the battery, passing through the first diode and the inductor and bypassing the second diode; and
during a motor mode, a motor current flows from the battery to the starter-generator, passing through the second diode and bypassing the first diode and the inductor.

2. The system of claim 1 , wherein the first capacitor and the inductor form an L-C filter.

3. The system of claim 1 , wherein during the re-generation mode for charging the battery, the re-generation current flows through the first capacitor and the inductor respectively.

4. The system of claim 1 , further comprising a power inverter/converter connected between the starter-generator and the second capacitor.

5. The system of claim 4 , wherein the power inverter/converter comprises six MOSFETS each including a diode.

6. The system of claim 4 , wherein:
during the motor mode, the power inverter/converter includes an inverter from DC to 3-phase AC sinusoidal; and
during the re-generation mode, the power inverter/converter includes a converter from 3-phase AC sinusoidal to DC.

Assignees

• Continental automotive systems inc
• Continental Powertrain Usa Llc

Inventors

• Zhu Ping

Classifications

• H02J7/24

  using discharge tubes or semiconductor devices · CPC title

• H02P2201/13

  DC-link of current link type, e.g. typically for thyristor bridges, having an inductor in series with rectifier · CPC title

• B60L2240/423

  Torque · CPC title

• B60L2270/147

  electro magnetic [EMI] · CPC title

• B60L50/51

  characterised by AC-motors · CPC title