一种带上电时序控制及过脉宽保护功能的大功率调制电路研究

大功率脉冲调制电路根据雷达系统所需脉冲宽度及重频将连续电压信号调制为脉冲工作电压，可以改善GaN功率器件的效率与可靠性。为了提升调制发射脉冲信号的上升下降沿速度，提高大功率调制电路可靠性，提出一种新型带上电时序控制及过脉宽保护功能的大功率调制电路，该电路包括上电时序控制电路、过脉宽保护电路、大功率调制电路。通过对电路进行理论分析，给出详细参数并计算该电路参数，并对关键参数进行仿真及实测验证，该电路具有调制电压高，上升下降沿速度快等特点。经过测试验证，调制电压最高100V，调制频率最高可达500KHz，峰值工作电流超过20A，上升沿、下降沿小于30ns。具有广阔的应用前景。

Research and design on a power pulse modulation circuit includes sequence control mode and over pulse width protection mode

According to the pulse width and frequency of the SAR system, the power pulse Modulation Circuit can translate the continues wave (CW) voltages into pulse modulation voltages, which can improves the efficiencyand reliabilityof the power GaN devices. In this paper, to meet the rising and falling time of the pulse modulating RF signals, as well as improve the reliability of the pulse modulation circuit, the implementation schemes of a novel high power pulse modulation circuit includes sequence control mode and over pulse width protection mode are described. Some of the theoretical analyses concerning the circuit aregiven;it is proved that the scheme is reasonable and actable according to the result of simulation and engineering practices. Experiments demonstrate that the pulse modulation voltage can reach 100V, the frequency of the pulse modulation can reach 500KHz, peak current can attain 20A,the rising and falling time of the voltage pulse of the drain modulation circuit is less than 30ns.