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    • 58. 发明公开
    • DRIVE DEVICE FOR ELECTROMAGNET COIL
    • 驱动装置的电动MAGNETSPULE
    • EP2750147A4
    • 2015-04-08
    • EP12826434
    • 2012-08-02
    • FUJI ELEC FA COMPONENTS & SYSFUJI ELECTRIC CO LTD
    • MORITA AKIRATAGUCHI TAKAHIRO
    • H01F7/06
    • H03K17/6877H01F7/064
    • 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.