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Helicopter airborne time-domain SHEPWM detection signal segmented control method

A technology for segmented control and signal detection, applied in measurement devices, electrical/magnetic exploration, geophysical measurement, etc. The effect of reducing the number and reducing the switching frequency

Inactive Publication Date: 2019-01-04
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, increasing the switching frequency of the inverter can effectively improve the quality of the emission current, but this means that while improving the efficiency of the emission system, the switching loss will increase, the power device will heat up severely, and the allowable current will decrease. Efficiency also decreases

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  • Helicopter airborne time-domain SHEPWM detection signal segmented control method
  • Helicopter airborne time-domain SHEPWM detection signal segmented control method
  • Helicopter airborne time-domain SHEPWM detection signal segmented control method

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Embodiment Construction

[0052] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] Such as figure 1 , the specific embodiment hardware system structure comprises: input DC voltage Ei, main control module, drive circuit, single-phase full-bridge circuit, transmitting coil five parts are made up of, and wherein main control module calculates and produces four-way SHEPWM control pulse; Drive circuit is used for generating Four-way drive signal; the single-phase full-bridge circuit is composed of four IGBT power devices VT1, VT2, VT3, and VT4, which are used to convert DC voltage into AC voltage. The emitter of VT1 is connected to the collector of VT2, and the emitter of VT2 It is connected to the emitter of VT4, the collector of VT4 is connected to the emitter of VT3, and the collector of VT3 is connected to the collector of VT1.

[0054] Such as figure 1 , the specific embodiment The connection mode of the ha...

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Abstract

The invention relates to a helicopter airborne time-domain SHEPWM (Selective Harmonic Elimination Pulse Width Modulation) detection signal segmented control method. Through Fourier transformation of the ideal output voltage of a helicopter airborne time-domain electromagnetic emission system, an SHEPWM segmented control nonlinear equation set under the condition of semi-cycle mirror symmetry of the ideal output voltage waveform of the emission system is put forward. A switching time sequence corresponding to the ideal output voltage is obtained through a neural network recursive algorithm to realize accurate control of the DC component as well as the amplitudes and phases of the fundamental wave and odd controlled harmonics of the ideal output voltage waveform of the inverter of the emission system. Thus, the switching frequency is reduced, the time-domain and frequency-domain quality of the emission current is improved, and the efficiency of the system is improved. The method of the invention is applied to a helicopter airborne time-domain electromagnetic emission system, and can improve the efficiency of the system while ensuring the detection accuracy.

Description

technical field [0001] The invention belongs to the technical field of a helicopter-type aviation time-domain detection signal transmitting system in geophysical exploration, and relates to a helicopter-type aviation time-domain SHEPWM detection signal segmentation control method. Background technique [0002] Helicopter airborne time-domain electromagnetic method has the advantages of high detection efficiency and wide application range, and has become an effective method for modern geological survey and mineral exploration. The principle is to use the alternating current generated by the system in the transmitting coil to stimulate a primary electromagnetic field change in space. According to Lenz's law, if the underground contains electromagnetically sensitive ore bodies (such as metal ore), a secondary induction field will be generated. The system obtains its secondary induced voltage from the receiving coil, and analyzes the attenuation of the voltage curve to obtain i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
CPCG01V3/083G01V2003/084
Inventor 于生宝房钰高丽辉陈楠侯佳伟
Owner JILIN UNIV
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