【摘要】：提出一種直升機(jī)時(shí)間域航空電磁發(fā)射系統(tǒng),采用PWM調(diào)制技術(shù)實(shí)現(xiàn)梯形波發(fā)射波形的上升沿及平頂段電流可控,提高輸出電流的控制精度,解決上升沿、下降沿拖尾的問(wèn)題,并利用軟硬件相結(jié)合的方法消除下降沿過(guò)沖;研究大功率器件的并聯(lián)技術(shù)和軟關(guān)斷技術(shù),實(shí)現(xiàn)大功率器件的動(dòng)、靜態(tài)均流;設(shè)計(jì)雙閉環(huán)穩(wěn)壓電源,提高發(fā)射電流波形的穩(wěn)定性,改善一次場(chǎng)質(zhì)量;將CHTEM-I系統(tǒng)應(yīng)用于野外測(cè)試。研究結(jié)果表明:CHTEM-I系統(tǒng)的發(fā)射磁矩達(dá)254 469 A·m~2,發(fā)射電流上升時(shí)間小于2.2 ms,峰值為500 A,下降沿關(guān)斷時(shí)間小于1 ms,具有發(fā)射磁矩大、信噪比高、波形穩(wěn)定性好、反應(yīng)深層地質(zhì)信息能力強(qiáng)的特點(diǎn)。
[Abstract]:A helicopter time-domain aero-electromagnetic launch system is proposed. The rise edge and flat-top current of trapezoidal wave emission waveform are controlled by PWM modulation technology. The control accuracy of output current is improved, and the problems of rising edge and falling edge trailing are solved. And using the method of combining software and hardware to eliminate the overshoot of drop edge; to study the parallel technology and soft turn-off technology of high-power devices, to realize the dynamic and static current sharing of high-power devices; to design a double-closed-loop power supply for stabilizing voltage, to improve the stability of the transmitting current waveform, Improve the quality of primary field and apply CHTEM-I system to field test. The results show that the emission magnetic moment of the 1: CHTEM-I system is 254,469A mm2, the rising time of emission current is less than 2.2 ms, the peak value is 500A, and the down-turn off time is less than 1 ms, which has the advantages of large emission magnetic moment, high signal-to-noise ratio and good waveform stability. The ability of reflecting deep geological information is strong.
【作者單位】： 吉林大學(xué)儀器科學(xué)與電氣工程學(xué)院;中國(guó)國(guó)土資源航空物探遙感中心;
【基金】：國(guó)家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)項(xiàng)目(2013AA063904-1)~~
【分類號(hào)】：P631.326

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