作者：苟轩, 王增增

作者单位：电子科技大学自动化工程学院, 四川 成都 611731

关键词：分压网络;阻容匹配;寄生电容;频率响应

摘要：

现代功率分析仪电压测量通道要求同时满足高频、大电压及高精度的测量需求，通道输入级的阻容分压网络对满足这些需求起着关键作用。实验发现，电路的寄生参数对于中高频段测量结果有明显影响，使得测量精度变差。该文将寄生参数考虑进电路，给出分压网络的集总参数模型；基于该模型介绍阻容匹配的必要性，并引入一种新型实用匹配方法。通过PSPICE仿真，分析各参数对分压网络频率特性的影响，并指出影响分压网络测量精度的关键因素。经实物测试，验证分压网络集总参数模型的准确性；DC-1MHz频率范围内，良好匹配的阻容分压网络测量精度达到功率分析仪测量需求。

Study on frequency characteristics of high frequency and large voltage resistor-voltage divider network

GOU Xuan, WANG Zengzeng

School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China

Abstract: For voltage channel of the modern power analyzer, high frequency, high voltage and precision is required to be met simultaneously, and the voltage divider network locating at the input stage is the key. According to experiment result, the measurement accuracy is much worse at middle-high frequency range because of the influence of parasitic parameters in circuit. In this paper, the parasitic parameters are considered into the circuit, and the lumped parameter model of the voltage divider network is given. Based on the model, the necessity of RC matching is introduced and a new engineering matching method is given. Through the PSPICE simulation, the influence of each parameter on the frequency characteristics of the voltage divider network is analyzed, and the key for measurement accuracy is proposed. Sample circuit proved the accuracy of the lumped parameter model. The measurement error of properly matched voltage divider network meets the needs of power analyzer within DC-1 MHz frequency range.

Keywords: voltage divider network;RC matching;parasitic capacitance;frequency characteristics

2018, 44(12): 152-156  收稿日期: 2018-08-15;收到修改稿日期: 2018-09-29

基金项目: 

作者简介: 苟轩(1986-),男,四川达州市人,硕士,主要研究方向为精密功率测量仪器和高频开关电源技术

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