发明名称 |
Watthour meter or wattmeter comprising hall sensors. |
摘要 |
<p>A watthour meter or a wattmeter comprising Hall sensors and possessing a precise linearity of the conversion of low voltage into frequency within a broad dynamic range. The required linearity is achieved by providing a multiplication-adding circuit MS with a current output, to which the noninverting input of the last operational amplifier in said circuit is connected, by providing a current-frequency converter IFC with a differential integrator DI comprising an active compensation feedback circuit, by shunting the output and the input of the converter IFC by a compensation circuit CC to compensate the ripple, offset and charge injections of electronic switches, and by placing the Hall sensors so that the magnetic induction direction in the slits of a ferromagnetic yoke is different for each sensor of a pair of them.</p> |
申请公布号 |
EP0322802(A1) |
申请公布日期 |
1989.07.05 |
申请号 |
EP19880121604 |
申请日期 |
1988.12.23 |
申请人 |
ISKRA-SOZD ELEKTROKOVINSKE INDUSTRIJE N.SOL.O |
发明人 |
ROZMAN, MIRO, DIPL.-ING.;ZLEBIR, SILVO, DIPL.-ING. |
分类号 |
G01R21/08;G01R21/133 |
主分类号 |
G01R21/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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