The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 1981
Filed:
Sep. 19, 1978
Robert F Bourke, Kamiah, ID (US);
David K Johansen, Lake-in-the Hills, IL (US);
Gould Inc., Rolling Meadows, IL (US);
Abstract
Cooling means for cooling a control such as for use in controlling the operation of electric vehicles or the like. The control utilizes a direct current battery power supply and includes an inverter for delivering alternating current to an alternating current motor of an air moving structure, such as a fan, provided for cooling the control during the operation thereof. The circuit is arranged to cause the fan to have variable power as a direct function of the load demand of the control circuit so that maximum cooling occurs when the load demand in the control is maximum and minimum cooling occurs when the load demand is minimum. The circuit is arranged to maintain an effectively constant volt-second duty cycle characteristic at the control power supply to the air moving structure whereby the variation in power developed by the motor thereof is a function of the duty cycle characteristics of the control power supply as applied to the motor. The control may include an oscillator and ramp for providing, in combination with a feedback signal from the output of the control power supply, a variable duty cycle control of the inverter of the control so as to provide the desired maintained volt-second characteristic of the control power supply.