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:
Jan. 24, 1984
Filed:
Dec. 29, 1981
Hitachi, Ltd., Tokyo, JP;
Abstract
In a power amplifier having a power circuit of a switching control system, a protective device for the power amplifier has connected to the amplifier a means for detecting an abnormal signal produced at the amplifier, and a control means connected between the detecting means and the power circuit to the amplifier so as to cut off a switching control signal to the power circuit when an abnormal signal is generated at the amplifier, thereby stopping the power circuit from operating to cut off power to the power amplifier. The detecting means is formed of a detecting circuit connected to the output end of the amplifier so as to detect the DC output voltage or excessive current from the amplifier, and a driving circuit connected to the detecting circuit so as to be operated by the output signal from the detecting circuit. The control means is formed of a switching control signal cut off circuit connected between the driving circuit and the power circuit so as to be supplied with the output voltage or current from the detecting means when it detects the DC output voltage or excessive current from the amplifier, thereby cutting off the switching control signal cut-off circuit.