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:
Aug. 20, 2013
Filed:
Feb. 24, 2011
Ayumu Hatanaka, Tokai, JP;
Akira Mishima, Mito, JP;
Takuya Mayuzumi, Hitachinaka, JP;
Mitsuhiko Watanabe, Odawara, JP;
Fumiaki Nasu, Hitachinaka, JP;
Ayumu Hatanaka, Tokai, JP;
Akira Mishima, Mito, JP;
Takuya Mayuzumi, Hitachinaka, JP;
Mitsuhiko Watanabe, Odawara, JP;
Fumiaki Nasu, Hitachinaka, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
The present invention realizes an injector drive circuit capable of providing high output power of a boost convertor while suppressing increases in size and cost thereof. An injector energizing circuitincludes an FETwhich applies a high voltagegenerated by a boost convertorto an injection valve. The boost convertorincludes an input side capacitor, a boosting FET, a boost coil, a boost diode, and FETsandprovided in association with a negative pole of an output side capacitor. During a period in which the high voltageis applied to the injection valve, a gate signalof the FETis turned ON and a gate signalof the FETis turned OFF. Consequently, the boosting FETperforms a switching operation to turn OFF the gate signalof the FETand turn ON the gate signalof the FETduring a period for charging into the output side capacitor. Thus, energy required for boosting can be reduced and an improvement in output is enabled.