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1. 发明公开

EP2750147A4 DRIVE DEVICE FOR ELECTROMAGNET COIL 有权
标题翻译：驱动装置的电动MAGNETSPULE
公开(公告)号：EP2750147A4
公开(公告)日：2015-04-08
申请号：EP12826434
申请日：2012-08-02
申请人： FUJI ELEC FA COMPONENTS & SYS , FUJI ELECTRIC CO LTD
发明人： MORITA AKIRA , TAGUCHI TAKAHIRO
IPC分类号： H01F7/06
CPC分类号： H03K17/6877 , H01F7/064
摘要： To provide an electromagnetic coil drive device which is configured to suppress the change of a current flowing into an electromagnetic coil so as to stabilize the current of the coil. The invention provides: a semiconductor switch (Q1) which is connected in series with an electromagnetic coil (10) so as to control a current flowing into the coil (10); a capacitor (C1); a comparator (30) which compares a voltage for charging/discharging the capacitor (C1) with two different voltages so as to generate a signal for operating the semiconductor switch (Q1) to turn on/off the semiconductor switch (Q1) in accordance with a result of the comparison; a charging circuit (50) which charges the capacitor (C1) based on a voltage applied to the coil (10); a charging circuit (60) which charges the capacitor (C1) based on a stabilized voltage; and a discharging circuit (70) which discharges the capacitor (C1). The charging circuit (50) has a resistor (R1), and compensating circuits (51 and 52) which are connected in parallel with the resistor (R1). In each of the compensating circuits (51 and 52), a resistor and a Zener diode are connected in series.

2. 发明公开

EP0791807A3 Phase difference measuring apparatus for measuring phase difference between input signals 失效
标题翻译：装置用于测量所述两个输入信号之间的相移
公开(公告)号：EP0791807A3
公开(公告)日：1998-07-08
申请号：EP97103010
申请日：1997-02-25
申请人： FUJI ELECTRIC CO LTD
发明人： YOSHIMURA HIROYUKI , MORITA AKIRA
IPC分类号： G01F1/86 , G01F1/84 , G01R25/00 , G01R25/04
CPC分类号： G01F1/8431 , G01F1/8436
摘要： A phase difference measuring apparatus for precisely measuring a phase difference between two input signals having the same frequency sent from, for example, a Coriolis type mass flowmeter. A differential amplifier in the apparatus provides the sum or difference of the two input signals and a multiplexor sequentially selects and outputs to an A/D converter the two input signals and the output of the differential amplifier. The A/D converter converts the output of the multiplexor into digital data and a digital signal processor or a microcomputer calculates the phase difference between the two input signals based on the converted digital data. The apparatus may further comprise a function that an error caused by the difference of the transfer characteristics of a filter and the A/D converter is compensated using a reference signal which is selected from the two input signals.

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