高速磁隔离驱动的同步脉冲群调制解调方法  

Synchronous pulse group modulation and demodulation method of high-speed magnetic isolation drive circuit

作　　者：许志坤 苏建徽[1] 赖纪东[1] 徐海波 XU Zhi-kun;SU Jian-hui;LAI Ji-dong;XU Hai-bo(Photovoltaic System Engineering Research Center of Ministry of Education,Hefei University of Technology,Hefei Anhui 230009,China;Dongguan South Semiconductor Technology Co.,Ltd.,Dongguan Guangdong 523000,China)

机构地区：[1]合肥工业大学光伏系统教育部工程研究中心,安徽合肥230009 [2]东莞南方半导体科技有限公司,广东东莞523000

出　　处：《电源技术》2021年第1期69-72,共4页Chinese Journal of Power Sources

基　　金：广东省重点领域研发计划(2019B010127001);中央高校基本科研业务费专项资金(PA2019GDPK0080)。

摘　　要：高速磁隔离驱动电路的信号调制解调,一般采用正负单脉冲调制解调,解调电路一旦受到干扰翻转,则在下一个脉冲到来之前无法恢复正常,进而造成驱动故障。提出一种同步脉冲群调制解调电路,以提高驱动电路抗干扰误触发的能力,同时满足用于太阳电池最大功率跟踪等占空比变化较大的宽范围PWM信号传输。对电路的工作原理和参数设计进行了详细分析和介绍,与常用的微分调制电路对比,该电路驱动脉冲延迟时间小,抗干扰能力强,能快速纠正误动作。仿真和实验验证了该电路的可行性和有效性。The signal modulation and demodulation of the high-speed magnetic isolation drive circuit generally adopts positive and negative single pulse modulation and demodulation.Once the demodulation circuit is disturbed and turns over,it cannot return to normal before the next pulse arrives,thereby causing drive failure.A synchronous pulse group modulation and demodulation circuit was proposed to improve the driving circuit's ability to resist false triggering,and at the same time to meet the wide range of PWM signal transmission with large duty cycle change such as solar cell maximum power tracking.The working principle and parameter design of the circuit were analyzed and introduced.Compared with the commonly used differential modulation circuit,the circuit has the advantages of small driving pulse delay time,strong anti-interference ability and quickly correcting misoperation.The simulation and experiment verify the feasibility and effectiveness of the circuit.

关 键 词：驱动电路 磁隔离信号 调制与解调 同步脉冲群 

分 类 号：TM615[电气工程—电力系统及自动化]