公开(公告)号：EP0267693A1

公开(公告)日：1988-05-18

申请号：EP87309102.9

申请日：1987-10-15

Applicant: THE GENERAL ELECTRIC COMPANY, p.l.c.

Inventor： Dunn, Trevor Roy ,  Lucas, David Rex Shirley ,  North, Ben Brian ,  Joyce, Timothy Robert

IPC: G01R21/133 ,  G01R21/14

CPC classification number: G01R21/133 ,  G01R21/1331 ,  G01R21/14

Abstract: An electric power measuring device wherein input analogue signals representative of instantaneous values of current and voltage are applied to a multiplier (23) and the product applied to a converter (35, 37, 41, 43, 45, 47) to provide a pulse output signal having a frequency representative of the product and hence of the level of power consumption. Compensation for offset errors in the multiplier is effected by periodically reversing the polarity of one of the inputs to the multiplier and effecting corresponding reversals at the input to the converter to avoid irregularities in the output pulse rate when the level of power consumed is low.

Abstract translation: 一种电力测量装置，其中表示电流和电压的瞬时值的输入模拟信号被施加到乘法器（23）并且该乘积被施加到转换器（35,37,41,43,45,47）以提供脉冲输出 信号具有表示产品的频率并因此表示功耗水平。 对乘法器中的偏移误差的补偿通过周期性地反转乘法器的输入之一的极性并在转换器的输入处实现相应的反转来实现，以在功耗水平低时避免输出脉冲率的不规则性。

公开(公告)号：EP0265172A1

公开(公告)日：1988-04-27

申请号：EP87309103.7

申请日：1987-10-15

Applicant: THE GENERAL ELECTRIC COMPANY, p.l.c.

Inventor： Dunn, Trevor Roy ,  Lucas, David Rex Shirley ,  North, Ben Brian ,  Joyce, Timothy Robert

IPC: G01R21/133 ,  G01R21/14

CPC classification number: G01R21/133 ,  G01R21/1331 ,  G01R21/14

Abstract: An electric power measuring device wherein input analogue signals representative of instantaneous values of current and voltage are applied to a multiplier (23) and the resulting product signal is applied to a converter (35, 37, 41, 43, 45, 47) to provide a pulse output signal having a pulse rate representative of the product, and hence of the level of power consumption. The converter is of the kind including a capacitor (35) which is charged during successive periods of equal duration by the product signal and a much larger reference signal which reverses at the end of each capacitor charging period until the capacitor charge does not reverse in polarity during a charging period, so that reversal of charge on the capacitor is assured during the next charging period, whereafter the direction of the reference signal is again reversed at the end of each charging period. The reference signal is constituted by a bias signal component in the output of the multiplier to avoid errors in the converter output pulse rate due to spurious variations in the output of the multiplier.

Abstract translation: 一种功率测量装置，其中表示电流和电压的瞬时值的输入模拟信号被施加到乘法器（23），并且将所得到的乘积信号施加到转换器（35,37,41,43,45,47）以提供 具有表示产品的脉率的脉冲输出信号，因此具有功耗水平。 该转换器是一种包括电容器（35）的电容器，该电容器在产品信号的相等持续时间期间被充电，并且在每个电容器充电周期结束时直到电容器电荷没有极性反转之前反转的参考信号大得多 在充电期间，能够在下一个充电期间确保电容器的充电反转，此后，在各充电期间结束时，基准信号的方向再次反转。 参考信号由乘法器的输出中的偏置信号分量构成，由于乘法器的输出中的寄生变化导致转换器输出脉冲率中的avo id误差。