一种隔离式频率电流转换器的设计

Design of an isolated F/I converter

1.
Jining No.3 Coal Mine, Yanzhou Coal Mining Co., Ltd., Jining 272169, China
2.
School of Information and Electrical Engineering, China University of Mining and Technology, Xuzhou 221008, China

摘要: 提出一种隔离式频率电流转换器的设计方案。该频率电流转换器采用PIC16F1823单片机采集200～1 000 Hz频率信号，通过SPI协议与DA芯片MCP4911通信，将频率信号转换成电压信号，然后通过集成电路AD694将电压信号线性转换为标准的4～20 mA电流信号。工业测试结果表明，该频率电流转换器的数据采集精度可达0.5级，误差范围小于±0.5%，满量程工作时电流为26.8±0.2 mA，最低功耗仅为450 mW。
- 频率测量 /
- 频率电流转换 /
- 频率电压转换 /
- 电压电流转换 /
- 隔离变换
Abstract: The paper proposed design scheme of an isolated F/I converter. The converter uses PIC16F1823 single chip microcomputer to collect frequency signal of 200~1 000 Hz and transmits the frequency signal through SPI protocol to MCP4911 DA conversion chip for F/V conversion, then IC AD694 converts the voltage signal into standard current signal of 4~20 mA. The industrial testing result showed that the precision of data collection of the converter achieves 0.5 level, error range is less than ±0.5%, working current is 26.8±0.2 mA in full range, and the lowest power consumption is 450 nW.
- frequency measurement /
- F/I conversion /
- F/V conversion /
- V/I conversion /
- isolated conversio