发明授权
- 专利标题： Transformerless kilowatthour meter for an electrical power line
- 专利标题（中）： 用于电力线的无变压器千瓦表
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申请号： US509681申请日： 1974-09-26
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公开(公告)号： US3953795A公开(公告)日： 1976-04-27
- 发明人: Julius Brunner , Manfred Schwendtner , Gunter Steinmuller
- 申请人： Julius Brunner , Manfred Schwendtner , Gunter Steinmuller
- 申请人地址： DT Munich
- 专利权人： Siemens Aktiengesellschaft
- 当前专利权人： Siemens Aktiengesellschaft
- 当前专利权人地址： DT Munich
- 优先权： DT2348667 19730927
- 主分类号： G01R22/00
- IPC分类号： G01R22/00 ; G01R21/127 ; G01R21/133 ; G06G7/161 ; G01R7/00 ; G01R11/32
摘要：
This invention is an electronic kilowatthour meter with a time-division multiplier, wherein a proportional first current is derived from the load voltage without a voltage transformer and a proportional second current is derived by means of an inverting amplifier, with a polarity opposite to that of the first current and instantaneous values halved as compared to the first current, and that the first current is added to the second current in one of two switching conditions by means of a switch which is operated by a pulse width-frequency modulator controlled by the load current, so that the average value of the sum current is proportional to the product of the load current and the load voltage.
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