DESIGN OF A TWO-STAGE ELECTROMAGNETIC IMPULSE FORCE CIRCUIT FOR GENE GUN

The main objective of this paper is to present a design of the power source for gene gun based on the principle of electromagnetic mechanism. The energy stored in capacitors will be discharged toward the electromagnetic device of gene gun for providing micro-projectiles with electromagnetic force to generate the desired impact force, and a specific electronic circuit is to be designed to achieve the coupling between the electromagnetic device and the energy storage capacitor. A gene gun is to be implemented for a testing purpose. In order to reduce the size and the cost of the gene gun, a two-stage electromagnetic control strategy is developed in which a single chip is utilized to control the discharge time of dual capacitors in order to increase the impact force. According to the experimental results, with the same capacitance, the proposed gene gun can generate higher impact force with smaller sizes and lower cost, and the validity and feasibility of the proposed electromagnetically powered gene gun is thus verified.

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