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Cooling system for a power electronics module to drive at least on electrical unit in a motor vehicle

  • US 20020124997A1
  • Filed: 12/08/2000
  • Published: 09/12/2002
  • Est. Priority Date: 06/16/1998
  • Status: Abandoned Application
First Claim
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1. A cooling system for a power electronics module to drive at least one electrical unit in a motor vehicle, in particular a starter motor/generator, comprising a pressure sealed compartment (2) for housing an electrical assembly (1) and a bath (3) of electrically isolating primary coolant surrounding this, boiling, at operating pressure, at a temperature which does not exceed the maximum permissible operating temperature of the electronic assembly (1), a heat exchanger (5), fitted above the meniscus of the primary coolant, or linked with this by means of a connecting device (9), whereby primary coolant vaporised in the electrical assembly (1) reaches the heat exchanger (5) as vapour, there condenses and flows back to the bath (3), thus providing circulation of the primary coolant, a secondary cooling circuit, with a secondary coolant, having a cooler (8) cooling the heat exchanger (5), he secondary cooling circuit (6) having at least one low point for the coolant below the level of the heat exchanger (5) and the secondary cooling circuit (6) having a pump (7) to force a circulating flow of the secondary coolant.

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