一种新的高精度电流/频率转换电路逻辑控制方法

汪金华; 刘嘉; 庄永河; 杨杨; 李鸿高

doi:10.19304/J.ISSN1000-7180.2022.0432

一种新的高精度电流/频率转换电路逻辑控制方法

doi: 10.19304/J.ISSN1000-7180.2022.0432

中国电子科技集团公司第四十三研究所, 安徽合肥230088

基金项目: 国防科技重点研发项目（1905WX0006）

详细信息

作者简介:
汪金华：男,（1982-）,硕士,高级工程师. 研究方向为高精度信号测量电路. E-mail：jinhuaw@mail.ustc.edu.cn

刘嘉：男,（1987-）,硕士,高级工程师. 研究方向为高精度信号测量电路

庄永河：男,（1974-）,硕士,研究员. 研究方向为测控电路

杨杨：男,（1980-）,本科,高级工程师. 研究方向为信号转换电路

李鸿高：男,（1964-）,本科,研究员. 研究方向为数模混合集成电路

中图分类号: TN402
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- 文章访问数: 20
- HTML全文浏览量: 15
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2022-07-19
- 修回日期: 2022-10-11

A new logic control method of the high precision current/frequency converter

The 43th Research Institute of China Electronics Technology Group Corporation, Hefei 230022, Anhui, China

摘要

摘要:
电流/频率转换器主要是对加速度计输出电流进行高精度测量,典型展宽复位电荷平衡式电流/频率转换器的逻辑控制方法对精度影响较大. 针对典型逻辑控制方法的不足,提出了一种新的逻辑控制方法. 电路积分器输出通过一级D触发器作为比较电路实现模拟数字转换输出,然后通过二级D触发器和与门形成的自锁电路产生计数器启动触发脉冲,最后通过计数器电路计数形成开关控制逻辑. 新方法避免了典型方法中对积分时间的约束,减小了大电流输入和小电流输入时积分器输出波形的平均值差异,从而有效提高了电路精度. 对同一个硬件电路通过编写不同的CPLD算法程序进行性能对比测试,结果表明新的方法比典型的方法使电路精度得到明显提升.
- 电荷平衡 /
- 电流/频率 /
- 逻辑控制 /
- 积分时间
Abstract:
The current/frequency converter is mainly used to measure the output current of accelerometers,the logic control method of typical extended width reset charge balance current /frequency converter has a great influence on the accuracy. To overcome the control logic shortage of typical logic control method, a new logic control method is given. The integrator output of the circuit realizes the analog-to-digital conversion output through the primary D trigger as the comparison circuit,then the counter start trigger pulse is generated by the self-locking circuit formed by the second D trigger and the and gate, finally the switch control logic is formed by counting of the counter circuit. The new method avoids the constraint of integration time in typical method ,and reduces the difference of the average value of the integrator output waveform between high current input and low current input, thus the circuit accuracy is effectively improved. The performance of the same hardware circuit is tested by writing different CPLD algorithmic programs, the results show that the new method can significantly improve the circuit accuracy compared with the typical method.
- charge balance /
- current/frequency /
- logic control /
- integration time

HTML全文

图 1 电荷平衡式I/F转换电路方框图

Figure 1. Block diagram of charge balance I/F converter

下载: 全尺寸图片幻灯片

图 2 典型的展宽复位逻辑电路

Figure 2. Logic circuit of traditional extended width reset

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图 3 典型的展宽复位逻辑控制不同电流输入下积分器输出波形

Figure 3. The integrator output waveform of typical extended width reset Control logic in different current input

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图 4 积分器等效模型

Figure 4. The equivalent model of the integrator

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图 5 新的展宽逻辑控制电路

Figure 5. Control logic circuit of new extended width reset

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图 6 新的方法大小输入电流下积分器输出波形

Figure 6. The waveform of the new method of small current and large current input

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图 7 新的方法在大电流下的波形

Figure 7. The waveform of the new method of large current

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表 1 产品测试数据

Table 1. The testing data of the product

输入电流/ mA	典型方法输出频率/Hz	新的方法输出频率/Hz
1	5192.2	5192.31
5	25960.6	25961.89
10	51921.6	51923.97
15	77882.5	77885.57
25	129812.4	129811.16
35	181738.8	181734.14
42	218084.9	218080.42
非线性度	3.6×10⁻⁵	7.9×10⁻⁶

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