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    • 3. 发明公开
    • Electric current detector and motor driving device using the same
    • Stromdetektor und Motorantriebsvorrichtung unter Verwendung死亡Detektors
    • EP1406095A1
    • 2004-04-07
    • EP03016549.2
    • 2003-07-24
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • Maeda, ShiroHarada, KazuhiroNoma, HirofumiArakawa, Masashi
    • G01R19/00H02P7/00G05F1/575
    • G01R19/15
    • An electric current detector which detects the current flowing both the positive and negative directions using the positive DC supply source alone (with single supply source), viz. without employing the negative DC supply source; and a motor driving device using the electric current detector are offered. The current detector includes the positive DC supply source (1); a first resistor (2), a second resistor (3) and a third resistor (4) connected in series; and differential amplifying means (5). Where, one end of the first resistor (2) is connected to the positive DC supply source (1), one end of the third resistor (4) is grounded, the current to be detected is supplied to connection point between the second resistor (3) and the third resistor (4), the differential amplifying means (5) calculates the difference between the voltage at the connection point of second (3) and third (4) resistors and a certain specific voltage (Vref); and resistance values of the first resistor (2), second resistor (3) and third resistor (4) and the certain specific voltage are set so that the constant term in arithmetic formula of the differential amplifying means (5) turns out to be positive.
    • 检测器具有补偿单元,其从正的直流电源(1)向补偿单元提供补偿单元,该补偿单元从正在检测的电流产生的差分放大单元的输出值检测V off。 V off是当检测到的电流为零时放大单元的实际输出值与构成单元的零误差的理想输出值之间的差。
    • 8. 发明公开
    • Induction heating cooker
    • 感应加热炊具
    • EP0460279A2
    • 1991-12-11
    • EP90116562.1
    • 1990-08-29
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • Omori, HidekiNoma, HirofumiKominami, Hideyuki
    • H05B6/06
    • H02M7/53803H05B6/065Y02B70/1441
    • An induction heating cooker has a rectifier (13) for producing pulsating DC current, an inverter (14) which receives the pulsating current given from the rectifier (13) and produces a high frequency output current and a load circuit (15) including an output coil (21) and a resonance capacitor (22) connected in series to each other to receive high frequency output signal from the inverter, and the variation or adjustment of output electromagnetic power is made by changing duty ratio of the high frequency output current of the inverter by giving variable duty ratio setting signals to switching elements (Qa, Qb) in the inverter 14; the frequency of the high frequency output current of the inverter 14 is fixed, and therefore, unpleasant interference sound is not generated at parallel simultaneous operation.
    • 本发明的感应加热烹调器具有:产生脉动直流电流的整流器(13);接收从整流器(13)输出的脉动电流并产生高频输出电流的逆变器(14);以及具有输出端子的负载电路(15) 线圈(21)和谐振电容器(22),以接收来自逆变器的高频输出信号,并且输出电磁功率的变化或调节是通过改变高频输出电流的占空比 逆变器14中的开关元件(Qa,Qb)施加可变占空比设定信号的逆变器; 逆变器14的高频输出电流的频率是固定的,因此在并行同时操作时不会产生不愉快的干扰声音。