Title:
CONTROL DEVICE OF ELECTROMAGNETIC INDUCTIVE LOAD
Document Type and Number:
WIPO Patent Application WO/2011/111720
Kind Code:
A1
Abstract:
Provided is a control device of an electromagnetic inductive load capable of automatically adjusting a duty ratio corresponding to a target current value without obtaining the duty ratio by way of a computing unit. The control device, in a circuit in which a switching device (Q) and an electromagnetic inductive load (100) are serially connected between a direct current source and a ground, is provided with a current sensor (11) for detecting a regeneration current at an off-time during PWM activation of the switching device (Q); a current detection circuit (12) for outputting a current detection signal (Idetect) when the detected current has become smaller than the target current value; a PWM signal generation unit (13) which takes a clock signal of a predetermined frequency and the current detection signal (Idetect) as input, and generates a PWM signal (Vpwm) which becomes high-level or low-level in a period between when the (Idetect) rises and the clock signal falls; and a drive circuit (14) for activating and controlling the switching device (Q) by the PWM signal (Vpwm).
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Inventors:
OOISHI Eiichirou (())
大石 英一郎 (())
大石 英一郎 (())
Application Number:
JP2011/055424
Publication Date:
September 15, 2011
Filing Date:
March 08, 2011
Export Citation:
Assignee:
YAZAKI CORPORATION (4-28, Mita 1-chome Minato-k, Tokyo 33, 〒1088333, JP)
矢崎総業株式会社 (〒33 東京都港区三田１丁目４番２８号 Tokyo, 〒1088333, JP)
OOISHI Eiichirou (())
矢崎総業株式会社 (〒33 東京都港区三田１丁目４番２８号 Tokyo, 〒1088333, JP)
OOISHI Eiichirou (())
International Classes:
H03K17/695; G05F1/56
Attorney, Agent or Firm:
HONDA Hironori et al. (Eikoh Patent Firm, Toranomon East Bldg. 10F 7-13, Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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Claims: