Patent ID: 6747432
Filing Date: 2004-06-08
Classification: F01P,F04D,H02P,Y02B

Abstract:
A cooling fan motor drive apparatus for use in vehicle which drives cooling fan motors upon receipt of a power supply voltage through power supply lines, comprising:current-carrying switching means including first and second semiconductor switches interposed between a first power supply line and first and second cooling fan motors, a third semiconductor switch interposed between said second cooling fan motor and a second power supply line and a fourth semiconductor switch interposed between a first power supply line side terminal of said first cooling fan motor and a second power supply line side terminal of said second cooling fan motor; and control means for implementing control on openings and closures of said semiconductor switches so that said second and fourth semiconductor switches are closed when said first and second cooling fan motors are driven in series and said first, second and third semiconductor switches are closed when said first and second cooling fan motors are drive in parallel.