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:
Jun. 09, 1992
Filed:
Feb. 07, 1990
Satoshi Ibori, Funabashi, JP;
Shigeyuki Baba, Funabashi, JP;
Hiroshi Fujii, Chiba, JP;
Takatsugu Kanbara, Funabashi, JP;
Kenji Nandoh, Matsudo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
This specification discloses an overcurrent protective circuit for detecting an overcurrent flowing through an electrostatic self-turn-off device and suppressing the overcurrent. The overcurrent protective circuit according to the present invention comprises a power source for supplying a driving voltage to the electrostatic self-turn-off device to turn on the device, a switching circuit for performing on-off control of the driving voltage to provide a driving signal to the self-turn-off device, and a circuit for detecting the voltage of the driving control terminal and holding the potential of the driving control terminal below the driving voltage in response to the detected voltage reaching a predetermined value.