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:
Jul. 31, 1984
Filed:
Mar. 01, 1982
Yoshiharu Tada, Higashimatsuyama, JP;
Yuichi Kitano, Higashimatsuyama, JP;
Diesel Kiki Kabushiki Kaisha, Tokyo, JP;
Abstract
A driving circuit for use in controlling a motor for controlling an air mixing door, an inner and surrounding air change-over door and a mode setting door and the like used in a vehicle air conditioning device, or a motor used in opening or closing of window panes of a vehicle or in opening or closing the door which includes a control transistor for use in controlling a transistor circuit having a transistor to cause both normal and reverse directed currents to flow in a vehicle motor, the control transistor being operated until a specified period of time has elapsed after the power supply switch is turned on, the motor input being shut off by the control transistor so as to prevent erroneous operation of the motor just after the power supply switch is turned on or to prevent the production of a chattering sound caused by the operation of gear trains with the motor. The control transistor is operated with a charging voltage in a capacitor for sensing a load of the motor, the motor input is shut off when an excessive load is applied to the motor, the shut-off condition of the motor input is maintained by a self-holding transistor, an electric load in the capacitor is discharged through the control transistor when the motor is stopped, the shut-off condition of the motor input is not continued with the remaining electric load of the capacitor, whereby the stationary motor may subsequently be driven.