Precharge Card Design With JLCPCB

As a community, our ambition is to make the most efficent vehicles powered by alternative energy sources for a better future. Our club; which was founded by Yıldız Technical University students, continues it’s legacy with the intense efforts of the students from different disciplines. Our motto is “Save Your Energy”, showing we aim to add value to the World technically and socially.

The AESK team takes part in national and international competitions in line with its ambitions and objectives. Vehicles produced by us took part in competitions such as Formula G and Efficency Challenge which are organized by TÜBİTAK. Aforementionded vehicles, which in addition works with solar and electric energy, have achieved a great success by getting degrees from the competitions.

As a team, which our ambition is to surpass ourselves, countinue to work with great enthusiasm and devotion.

During these processes, JLCPBC has been one of our best supporters in reaching our goal.

Pre-charge card; It consists of pre-charge circuit, battery current measurement circuit, contactors, gate driver circuits. The pre-charge circuit ensures that the capacities with very high Farad values in the dc bus of the motor driver fed from the battery group are filled in a controlled manner during the first operation. This circuit is controlled by the control card in the battery management system.

For the activity of the precharge circuit, the DC bus must not be full and the difference between the battery-bus voltage must be at a certain value. If these conditions are met, the pre-charge relay opens and the current is limited by resistors with high thermal resistance, and the pre-charge process is completed by synchronizing the voltage levels of the capacities in the dc busbar with that of the battery. In case the vehicle is in driving mode, the contactor on the motor driver's side opens, and in case of charging mode, the contactor on the built-in charger side opens.

The design was made on Altium Designer 15 software. Following this, the design was finished using Gerber. After all the steps were completed, we uploaded it on JLCPCB’s website and have it made custom by using this website: https://jlcpcb.com/RAT .

If you are wondering about how the PCB’s are manufactured in JLBPCB, you can watch this video: https://www.youtube.com/watch?v=pyz-kjLpZa8 .