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:
Mar. 20, 1984
Filed:
Aug. 21, 1981
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A generation indicating apparatus for a vehicle alternator in a generating and charging system includes an indicator lamp connected in series with an electric load and the series circuit of the indicator lamp and the electric load is connected to a battery through a key switch. A series circuit of an electric load drive transistor and an indicator lamp drive transistor is connected in parallel with the series circuit of the indicator lamp and electric load and a junction point between the indicator lamp and the electric load is connected through a line to a junction point between the two drive transistors. Either the load drive transistor or the lamp drive transistor is made conductive depending upon whether a voltage built up by the alternator has reached a predetermined level or not. The generation indicating apparatus includes an abnormal voltage detecting circuit and an oscillator circuit, and when an abnormal voltage is detected on the line between the junction points of the indicator lamp circuit and the drive transistor circuit, depending on whether the alternator is in a generating condition or not, either the electric load drive transistor or the indicator lamp drive transistor is controlled by a pulse signal from the oscillator circuit to become conductive only an on period of the pulse signal. A current flowing through either of the drive transistors is limited and the abnormal voltage level on the line is lowered at each of succession of pulse signals to ensure the restoration of the drive transistors to a normal operation after the abnormal voltage is removed.