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US6331365: Traction motor drive system

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Filing Information

Inventor(s) Robert Dean King ·
Assignee(s) General Electric Company ·
Primary Examiner Stephen Kalafut ·
Application Number US9190069
Filing date 11/12/1998
Issue date 12/18/2001
Predicted expiration date 11/12/2018
U.S. Classifications 429/9  · 320/126  · 320/103  ·
International Classifications --
Kind CodeB1
International Classifications 429 9 · 320103 · 320126 ·
22 Claims, 10 Drawings


Abstract

A power system for an electric motor drive such as may be used in an electrically propelled vehicle incorporates the combination of a high power density battery and a high energy density battery to provide an optimal combination of high energy and high power, i.e., a hybrid battery system. The hybrid battery system in one form includes components which prevent electrical recharge energy from being applied to the high energy density battery while capturing regenerative energy in the high power density battery so as to increase an electric vehicles range for a given amount of stored energy. A dynamic retarding function for absorbing electrical regenerative energy is used during significant vehicle deceleration and while holding speed on down-hill grades, to minimize mechanical brake wear and limit excessive voltage on the battery and power electronic control devices. The high energy density battery coupled in circuit with a boost converter, a high power density battery, a dynamic retarder, and an AC motor drive circuit. The hybrid battery system is controlled by a hybrid power source controller which receives signals from a vehicle system controller using current and voltage sensors to provide feedback parameters for the closed-loop hybrid battery control functions.

Independent Claims | See all claims (22)

  1. 1. A hybrid battery arrangement for an electrically powered system in which battery loading is subject to intermittent high power loading, the system including a hybrid battery coupled to supply electric power via a DC link to a load and a control system for controlling application of power to the load, the hybrid battery arrangement comprising: a first battery coupled to the DC link; a second battery coupled to the DC link, the first battery having higher energy and lower power densities than the second battery; and a boost converter, including a unidirectional conductor, coupled in circuit between the first battery and the second battery for selectively boosting the voltage from the first battery to a level sufficient to force current through the unidirectional coupler to the second battery.
  2. 13. A hybrid battery power system for an AC electric motor, the system comprising: a direct current (DC) link; an inverter coupled to the DC link; and a first battery and a second battery, each battery being coupled in circuit with the DC link such that power is suppliable to the inverter conjointly from the batteries, the first battery having higher energy and lower power densities than the second battery, the DC link being arranged such that regenerative energy is suppliable to the second battery and isolatable from the first battery.
  3. 22. A hybrid battery arrangement for an electrically powered system in which battery loading is subject to intermittent high power loading, the system including a hybrid battery coupled to supply electric power via a DC link to a load and a control system for controlling application of power to the load, the hybrid battery arrangement comprising: a mechanically rechargeable battery coupled to the DC link; an electrically rechargeable battery coupled to the DC link; and a boost converter, including a unidirectional conductor, coupled in circuit between the mechanically rechargeable battery and the electrically rechargeable battery for selectively boosting the voltage from the mechanically rechargeable battery.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US5237258* Applied Research and Technology, Inc. Crampton Aug 1993
US5373195 General Electric Company De Doncker et al. Dec 1994
US5592067* General Motors Corporation Peter et al. Jan 1997
US5659240 General Electric Company King Aug 1997
US5710699 General Electric Company King et al. Jan 1998
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* cited by examiner

Other Publications

Garrigan, et al, US Pat. application Ser. No. 09/094,285, filed Jun. 9, 1998, (Attorney Docket No. RD-26,122) Entitled “Bi-Direction Power Control System for Voltage Converter”.

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