PCB circuit board layout of pressure control unit.
- We have designed a control circuit board as a PCB board layout using EAGLE Layout Editor 6.4.0 and ordered the printed PCBs to Sierra Circuit Inc as a two-layer board (no touch PCB). The operating current and voltage of the valves are 0.375 A and 24 V. The n-channel MOSFET (metal–oxide–semiconductor field-effect transistor) is selected, which has a maximum rating of 12 A continuous drain current, ID-static, 30 A pulsed drain current, ID-pulsed, and 60 V Drain−Source Voltage, VDSS. To serve as a power driver of inductor-based loads, a diode is inversely connected from power 24 V to the drain of MOSFET, which helps to avoid the voltage shock due to the inertia of an inductor when the gate is suddenly closed. We used a fast-recovery rectifier diode to achieve a fast recovery time of 150 nanoseconds at 50 V peak repetitive reverse voltage (VRRM) and 30 A peak surge current (IPS). Here, we chose a low-side drive, i.e., we located a switch between load and ground or a negative power. We used this approach of low-side drive because the low-side drive is simpler and easier to implement. A high-side drive requires additional MOSFET components when the logic level and drive voltage don't match, which is our case (5 V and 24 V, respectively). In addition, p-channel MOSFETs have nearly three times more resistance than the n-channel MOSFRET with the similar ratings. However, the low-side drive can suffer from noise and voltage leakages because a positive supply voltage is still connected to the load during the off state (LO state). Even if bandwidth remains the same, one can implement a high-side drive when long-term stability is required.
|Type of resource
|[ca. August 30, 2011 - May 1, 2013]
|Sim, Joo Yong
|Pruitt, Beth L.
|PCB board design
|strain array controller
|the mechanical engineering at Stanford University
|Simmons CS, et al. (2011) Integrated strain array for cellular mechanobiology studies. J Micromech Microeng 21(5):054016. http://dx.doi.org/10.1088/0960-1317/21/5/054016
|Sim JY, et al. (2012) Uniaxial cell stretcher enables high resolution live cell imaging. 2012 IEEE 25th International Conference on Micro Electro Mechanical Systems (MEMS), pp 854–857.
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