基于串联谐振式全桥逆变射频发射机研制  

Development of Radio-Magnetotelluric Transmitter in Full-Bridge Series Resonant Inverter

作　　者：刘庆斌 亓庆新 

机构地区：[1]中南大学地球科学与信息物理学院,湖南 长沙 [2]湖南五维地质科技有限公司,湖南 长沙

出　　处：《地球科学前沿（汉斯）》2023年第4期364-379,共16页Advances in Geosciences

摘　　要：Radio-magnetotelluric (RMT)是浅层近地表地球物理勘探的一种方法,但是发射功率与频率成反比例的技术难题制约了超浅层勘探的信噪比,为了提高RMT发射机的发射功率,采用电阻、电感和电容组成的RLC串联谐振式全桥逆变大功率发射电路,利用串联谐振下负载阻抗最低,提高发射电流。本文在基于串联谐振原理上,利用功率MOS器件实现全桥逆变技术;对谐振周期内全桥电路的各个状态进行分析,提出输出电流的计算式,设计了RCD保护电路和栅极驱动电路。在电路仿真验证的基础上研制了一款发射样机,通过测试实验能够实现10~200 kHz频率、峰值电流最高达28 A的发射,能够满足RMT发射机的要求。Radio-magnetotelluric (RMT) is a method for shallow near-surface geophysical exploration, but the technical problem that the transmit power is inversely proportional to frequency restricts the signal-to-noise ratio of ultra-shallow exploration, and in order to improve the transmit power of RMT transmitter, the RLC series resonant full-bridge inverter high-power transmit circuit composed of resistance, inductance and capacitance is used to utilize the series resonance. In order to improve the transmitting power of the RMT transmitter, the RLC series resonant full-bridge inverter high-power transmitter circuit with resistor, inductor and capacitor is used to increase the transmitting current by using the lowest load impedance under series resonance. In this paper, based on the principle of series resonance, the full-bridge inverter technology is implemented using power MOS devices;each state of the full-bridge circuit during the resonant cycle is analyzed, the calculation equation of the output current is proposed, and the RCD protection circuit and the gate drive circuit are designed. Based on the circuit simulation and verification, a transmitter prototype is developed, which is able to achieve 10~200 kHz frequency and peak current up to 28 A through test experiments, and can meet the requirements of RMT transmitter.

关 键 词：RMT 串联谐振 全桥逆变 发射电路 

分 类 号：TN9[电子电信—信息与通信工程]