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    • 3. 发明授权
    • Arrangement for measuring electrical power
    • 电力测量装置
    • US4742296A
    • 1988-05-03
    • US922124
    • 1986-10-22
    • Jan PetrRadivoje PopovicThomas Seitz
    • Jan PetrRadivoje PopovicThomas Seitz
    • G01R21/08G01R21/133H01F38/30H01F38/32
    • H01F38/30G01R21/08G01R21/133H01F38/32
    • The present invention is an arrangement for measuring electrical power. The arrangement comprises a conductor traversed by an electrical current i and a voltage-to-current converter for transforming an electrical voltage u.sub.N into a proportional supply current i.sub.N for a Hall element. The Hall element is adapted to produce an intelligence containing output signal .+-.u.sub.H proportional to the product (.+-.i.u.sub.N) of the current i and the voltage .+-.u.sub.N. The Hall element is arranged in an air-gap of a ferromagnetic core that is excited by the current i. A voltage-to-frequency converter transforms the Hall element output voltage .+-.u.sub.H into a proportional output frequency. The voltage-to-frequency converter includes a capacitor for integration purposes and at least two signal sources. The power measuring device also includes a switch for periodically switching a signal proportional to the signal .+-.u.sub.H and for switching said signal sources to compensate for an offset voltage. Use of the arrangement permits an improvement in the ratio of the intelligence containing signal to an interference signal, which interference signal includes for example an offset voltage.
    • 本发明是用于测量电力的装置。 该装置包括由电流i穿过的导体和用于将电压uN变换成用于霍尔元件的比例供应电流iN的电压 - 电流转换器。 霍尔元件适于产生包含与电流i的乘积(+/- i.uN)成正比的输出信号+/- uH和电压+/- uN的智能。 霍尔元件布置在由电流i激发的铁磁芯的气隙中。 电压 - 频率转换器将霍尔元件输出电压+/- uH转换为比例输出频率。 电压 - 频率转换器包括用于集成目的的电容器和至少两个信号源。 功率测量装置还包括用于周期性地切换与信号+/- uH成比例的信号的开关,并且用于切换所述信号源以补偿偏移电压。 使用这种布置允许改善智能包含信号与干扰信号的比例,该干扰信号包括例如偏移电压。