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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.:

US 9780773 B1

PDFFull Text
Date of Patent:
Oct. 03, 2017

Filed:

Dec. 13, 2013

Load drive control device

Applicant:

Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki, JP;

Inventors:

Takahiro Kawata, Hitachinaka, JP;

Ryoichi Oura, Hitachinaka, JP;

Masahito Sonehara, Hitachinaka, JP;

Yoshitaka Abe, Hitachinaka, JP;

Takeo Yamashita, Tokyo, JP;

Assignee:

Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;

Attorney:

Crowell & Moring LLP

Primary Examiner:

Sibin Chen

Int. Cl.
CPC ...
H03B 1/00 (2006.01); H03K 17/16 (2006.01); H03K 17/08 (2006.01); H03K 3/012 (2006.01); H03K 3/013 (2006.01);
U.S. Cl.
CPC ...
H03K 17/16 (2013.01); H03K 3/012 (2013.01); H03K 3/013 (2013.01); H03K 17/08 (2013.01); H03K 17/164 (2013.01); H03K 2017/0806 (2013.01);
Abstract

Provided is a load drive slope control device that can reduce EMI noise, and power loss and heat generation when a drive transistor is turned on and off, and can prevent excessive high temperature-induced damage to the drive transistor at an excessive high temperature. Disclosed is a load drive control device including: a drive transistor that drives a load; a pre-driver that drives the drive transistor via an ON/OFF control terminal of the drive transistor; a capacitor that is connected to an input side of the pre-driver, a first current source that is ON/OFF controlled by a first signal, and generates current which is charged to the capacitor; and a second current source that is ON/OFF controlled by a second signal, and generates current for discharging the capacitor, in which an output voltage from the pre-driver is changed by charging or discharging the capacitor, the drive transistor is turned on and off by the output voltage from the pre-driver, and a linear ascending gradient and a linear descending gradient of the waveform of a voltage driving the load are obtained by turning on and off the drive transistor.

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