自动换向差动热瓦特表的研究

• 作 者: L.G.Cox 薛庆祥 徐化一
• 出 处: 国外计量
• 发表日期: 1981年06期
• 关键词: 加热器 直流功率 宽频 准确度 电流 直流信号 输人 电压 反馈电压 闭环增益

一、前言用热变换器实现电压或电流的高准确度交、直流转换是比较容易的,但是,用热变换器实现准确的交、直流功率转换就复杂得多。这种宽频带瓦特表是将交流和直流叠加在差动热变换器的两个加热器上,并进行自动换向,以消除由于加热器不同以及特性偏离平方律所引起的误差。

I. Preface The high accuracy of voltage or current with the heat converter can be achieved. DC and DC conversion is relatively easy. However, the accurate AC and DC power conversion by the heat converter is much more complex. This wide-band watt-hour meter superimposes AC and DC on two heaters of a differential heat converter and performs automatic commutation to eliminate errors caused by different heaters and deviations from the square law.