电磁超声导波大功率激励信号的线性放大方法
发布时间：2018-07-20 11:54
【摘要】：针对电磁超声导波大功率激励信号的线性放大问题,研究采用多个功率场效应管线性放大并联输出电路作为功率输出级,以提高线性放大后信号输出功率的方法。采用前级场效应管线性放大电路源极驱动方式为功率输出级电路设置静态工作点,并提供瞬态交流输入信号。采用差分结构配置整个电路以抑制开关特性引起的抖动,从而实现低功耗、大瞬态输出功率的线性放大电路的设计。试验结果表明,该线性放大电路能驱动中心频率为180 k Hz的电磁超声传感器,且能获得高信噪比的导波检测信号;在驱动50?标准负载时能输出瞬态功率可达1.8 k W的导波激励信号,且波形失真小。所提出的电磁超声导波大功率激励信号的线性放大方法能有效指导该类电路的设计。
[Abstract]:Aiming at the problem of linear amplification of high power excitation signal of electromagnetic ultrasonic guided wave, a method of improving the output power of linear amplified signal by using multiple power FET linear amplifying parallel output circuits as power output stage is studied. In this paper, the source driving mode of the linear amplifier of the front stage FET is used to set the static operating point for the power output stage circuit, and to provide the transient AC input signal. The differential structure is used to configure the whole circuit to suppress the jitter caused by the switching characteristics, so as to realize the design of the linear amplifier circuit with low power consumption and large transient output power. The experimental results show that the linear amplifier can drive the electromagnetic ultrasonic sensor with a central frequency of 180kHz and obtain a high signal-to-noise ratio (SNR) guided wave detection signal. Under standard load, a pilot wave excitation signal with a transient power of 1.8 kW can be output, and the waveform distortion is small. The proposed linear amplification method of electromagnetic ultrasonic guided wave high power excitation signal can effectively guide the design of this kind of circuit.
【作者单位】： 中北大学机械与动力工程学院;中国特种设备检测研究院国家质量监督检验检疫总局无损检测与评价重点实验室;
【基金】：质检公益性行业科研专项(201410026,201510068) 国家重点研发计划课题(2016YFF0203003)资助项目
【分类号】：TN722
本文编号：2133434
[Abstract]:Aiming at the problem of linear amplification of high power excitation signal of electromagnetic ultrasonic guided wave, a method of improving the output power of linear amplified signal by using multiple power FET linear amplifying parallel output circuits as power output stage is studied. In this paper, the source driving mode of the linear amplifier of the front stage FET is used to set the static operating point for the power output stage circuit, and to provide the transient AC input signal. The differential structure is used to configure the whole circuit to suppress the jitter caused by the switching characteristics, so as to realize the design of the linear amplifier circuit with low power consumption and large transient output power. The experimental results show that the linear amplifier can drive the electromagnetic ultrasonic sensor with a central frequency of 180kHz and obtain a high signal-to-noise ratio (SNR) guided wave detection signal. Under standard load, a pilot wave excitation signal with a transient power of 1.8 kW can be output, and the waveform distortion is small. The proposed linear amplification method of electromagnetic ultrasonic guided wave high power excitation signal can effectively guide the design of this kind of circuit.
【作者单位】： 中北大学机械与动力工程学院;中国特种设备检测研究院国家质量监督检验检疫总局无损检测与评价重点实验室;
【基金】：质检公益性行业科研专项(201410026,201510068) 国家重点研发计划课题(2016YFF0203003)资助项目
【分类号】：TN722
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2 刘成国;杨国纬;刘尚合;;一种非线性元件实现线性放大的改进技术与仿真[J];电波科学学报;2013年02期
3 ;名特优新[J];印制电路信息;1995年05期
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