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大功率超声电源的改进
作者:白生娟 张小凤
来源:《现代电子技术》2014年第19期
摘 要: 将集成式D类全桥电路引入超声电源中,采用IR2110芯片驱动MOSFET构成全桥式逆变主电路,实现逆变降压和输出电压控制。驱动电路以脉宽调制电路为核心,运用555芯片产生三角波信号,并将产生的三角波信号转化为不同偏置的两路三角波信号;然后分别与相应端口输入的正弦波信号进行比较调制,得到两路 PWM 波,提高了电路的动态响应并实现频率的可调性。
关键词: 超声电源; D类功放; PWM; IR2110
中图分类号: TN710?34 文献标识码: A 文章编号: 1004?373X(2014)19?0147?03 Improvement of high power ultrasonic power supply BAI Sheng?juan, ZHANG Xiao?feng
(College of Physics and Information Technology, Shannxi Normal University, Xi’an 710062, China)
Abstract: In order to realize the inversion step?down and output voltage control, the integrated class D whole bridge circuit is introduced into ultrasonic power supply, and IR2110 chip is used to drive MOSFET and form the main circuit of full bridge inverter. In the driver circuit, the pulse width modulation circuit is taken as the core, 555 chip is used to generate triangular wave signal and the triangular wave signal is converted into two triangular wave signals with different bias, which will be compared with the sine wave signals from corresponding ports to implement modulation respectively and get two way PWM waves, so as to improve the dynamic response of the circuit and realize the adjustability of frequency.
Keywords: ultrasonic power supply; class D power amplifier; PWM; IR2110
近些年,随着机械振动、电力电子技术的飞速发展,功率超声电源的应用愈来愈广泛,对功率超声电源的研制也提出了越来越高的要求。在超声加工过程中,振动系统的温度、刚度、静载荷、加工面积、工具磨损等因素的变化,使得系统的固有频率发生漂移,这就要求超声电源要具有频率自动跟踪功能;同时为保证加工质量和保护超声系统,要求电源具有根据负载调整输出功率的功能[1?5]。本文提出了一种新型超声电源的研制方案,系统采用PWM技术提高超声电源的动态响应,实现输出频率的可调性,从而为大功率超声换能器的应用提供性能优良的超声波电源。
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1 系统框图与工作原理
超声波电源系统