Battery charging system that controls charging power using fourth element capacitors

• US 6,104,169 A
• Filed: 08/19/1999
• Issued: 08/15/2000
• Est. Priority Date: 08/19/1999
• Status: Expired due to Term

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: General Motors Corporation (General Motors Company)
• Inventors: Hall, John T., Radys, Ray G.
• Primary Examiner(s): Tso, Edward H.
• Application Number:
  US09/377,527
• Time in Patent Office: 362 Days
• Field of Search: 320/108, 320/109, 320/128, 320/137, 320/138, 320/140, 320/FOR 148, 320/FOR 149, 320/DIG. 23
• US Class Current: 320/138
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A battery charging system for charging a battery of an electric vehicle that is coupled to a charge probe by way of a diode bridge and a fourth element capacitor. The system includes a voltage source and a plurality of battery chargers connected in parallel across the voltage source that each includes a series tank circuit and an isolation transformer. The charge probe is coupled to the isolation transformers of the parallel plurality of battery chargers. A distributed fourth element capacitor is coupled across the isolation transformers of each of the parallel plurality of battery chargers.

Claims

1. A battery charging system for charging a battery of an electric vehicle that is coupled to a charge probe by way of a diode bridge and a fourth element capacitor, the system comprising:

a voltage source);

a plurality of battery chargers connected in parallel across the voltage source that each comprise a series tank circuit and an isolation transformer;

a charge probe coupled to the isolation transformers of the parallel plurality of battery chargers; and

a distributed fourth element capacitor coupled across the respective isolation transformers of each of the parallel plurality of battery chargers.

2. In a battery charging system for charging a battery of an electric vehicle that is coupled to a charge probe by way of a diode bridge and a fourth element capacitor, which system comprises a voltage source, a plurality of battery chargers connected in parallel across the voltage source that each comprise a series tank circuit and an isolation transformer, and a charge probe coupled to the isolation transformers of the parallel plurality of battery chargers, wherein the improvement comprises:

a distributed fourth element capacitor coupled across the respective isolation transformers of each of the parallel plurality of battery chargers.