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❓ Problem statement
BPS is tasked with securing the safety and monitoring of the battery, such as current monitoring. Over-current of the battery can damage internal components and pose a risk to the driver.
💡 Research insights
There are 2 ways to measure current, either using a shunt resistor connected to the load or using a hall-effect sensor. They have their own pros and cons but they solve the same problem.
📊 Solution hypothesis
The solution is successful if we are able to track current reliably and transmit that data to the leaderboard.
🌈 Design options
There are only 2 ways to measure current. Either measure the voltage across a resistor in series with the load or we can measure the magnetic field of the wire.
Option 1 - Voltage Across a Resistor | Option 2 - Magnetic Field of Wire | |||||||||
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Overview | Current Sense Amplifier w/ Shunt Resistor | Hall-Effect Current Sensing | ||||||||
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Pros and cons |
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Preferred
Affected by electric noise (can be isolated)
Specs
Criteria:
Precision: 16bits
Range: 0-7A at 120V
Accuracy | Bigger shunt resistor allows for more accuracy | |
Power Dissipation | Smaller shunt resistor consumes less power |
✅ Follow up
Decision | Status | Next steps | ||||||
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Use Option 1 for the base design of the board |
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💎 Source files
Type /link to add links to design files.