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Design Solution
Design Solution
In order to begin building an at home use TMS device, a High Current Pulse Generator Circuit created by Iowa State Senior Design Project was used as a foundation and modeled on Multisim1. The circuits component configuration was reconfigured in order to increase the output current to closer meet the needs for TMS; while still maintaining the needed waveform. First the AC power source used was replaced with a DC power source in order to implement a control safety measure. In conjunction a power converter was added as a sinusoidal waveform input is needed. The increase of power storage components were then used to generate sharper and rapid pulses to induce the magnetic field. Next the decrease in the resistance over the load was reduced to match the other resistor values; resulting in a higher output current produced. Two resistors were added in parallel on both the positive and negative circuit paths. It was determined that two additional resistors was the best middle ground of an increase in current while not distorting the TMS waveform. The values and configuration of the inductor and capacitor were chosen to remain the same; as altering resulted in an undesired lack of skew in the resultant waveform.
Figure 1: Schematic of remodeled circuit. Simulation completed through NI Multisim. High current pulse generator allowing for rapid current alterations to induce magnetic field at load R3.
Results
Results
Changes of the High Current Pulser Generator circuit components gave rise to current output of 245 Amperes over the load. Which resulted in tripling the amount of the original current output of 78 Amperes. The objective waveform was maintained with the alterations in order to generate a valid example of TMS pulses. The goal of obtaining 500 Amperes was halfway obtained through the modifications of the circuit design.
Figure 2: Resulting waveform from simulation.
Figure 3: Theoretical TMS waveform shape.
Leader: Nicole Gibson
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