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Research on Targeting Magnetic Field Generator

Author: FuYiKui
Tutor: YangYongMing
School: Chongqing University
Course: Electrical Engineering
Keywords: Magnetic targeted drug delivery system Targeted magnetic field Clamp Bootstrap power supply
CLC: TH789
Type: Master's thesis
Year: 2011
Downloads: 46
Quote: 0
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Abstract


Magnetic targeting drug delivery system is a targeted drug delivery system, in recent years become one of the hot spots. The purpose of magnetic targeted drug delivery system is magnetic drug guide magnetic field, the particles reach the target and release oscillation. The guidance magnetic field requires a certain magnetic field strength and magnetic field steepness, but also in the spatial distribution, in order to facilitate the oscillation of the magnetic drug absorption. Magnetic field is not very high steepness now study targeting magnetic field generating device, and only generates a magnetic field in targeting poles, no distribution in space, this paper presents a field steepness, targeting magnetic field distribution in space 's research program. The main contents of this article do as follows: ① described various rotating magnetic field generated by comparing the analysis more suitable way to determine the electromagnetic coils to produce a rotating magnetic field of the rotating magnetic field targeting studies. (2) through the understanding of the magnetic material characteristics as well as the analysis of magnetic materials required, as a magnetic material, with a soft magnetic material silicon steel sheet of pure iron as the material of the yoke. ③ According to the magnetic field intensity steeply high requirements, proposed using the capacitance of the electromagnetic coil to implement the method of clamping of the leading and trailing edges. Require fast shutdown shutdown faster power MOSFET as a switching device. Volume of the battery power supply is large and inconvenient to move, designed for this output current is about 10 amps, the voltage source circuit. PSIM simulation software on the main circuit simulation analysis to verify the feasibility of the main circuit. ④ to the drive circuit has been designed. Leg switch on the main circuit is floating, the need for a separate power supply. In order to reduce the number of the power supply, it is proposed a drive circuit of bootstrap power supply solutions. Bootstrap is critical to the determination of the bootstrap capacitor in the power supply, for this analysis, and calculate the bootstrap capacitor value. Experiment, the measured waveform of the driving circuit design fully comply with the required drive of the power MOSFET. ⑤ of the control circuit design. To make the duty cycle of the the microcontroller output pulse signal is 50%, two frequency divider circuit to achieve the corresponding driving control signal using the D flip-flop design. Design the program flowchart achieve a toggle switch to control the frequency stalls, coil control port turn conduction function. ⑥ comparative analysis of various current waveform to determine the the Bipolar delay square wave is more suitable for the targeted therapy. The qualitative analysis of the movement and force of the magnetic particles in bipolar delay square wave, know Bipolar delay square wave is conducive to drug oscillation release. Protel software to draw the PCB, and the experimental board debugging. The debugging results showed that the targeted magnetic field generator to solve the existing targeting high magnetic field generator magnetic field steepness, and laid a good foundation for the next phase of product development. ⑦ Finally, the research work carried out summary and outlook, and pointed out that further research direction and content.

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