Our team collaborated with RF SPARKLING Kft. to design a sub-assembly for a product, which required a special battery protection/backup circuit. We were in charge to design and develop the device from sketch.
The requirements included several key features:
have a socket for two18650 battery
have a circuit that ensures each cell is discharged until a predefined threshold
merge the two protected output of the battery into one signal
have a 3V 150mA LDO output
have a low battery signal which threshold is higher than the discharged threshold
have a circuit that disconnects the output at the discharged state and ensure the battery cannot be discharged more
After carefully discussing the requirements, we created a small specification book and began working on the project. The design was completed in a short timeframe. To speed up the process, we offered a special service* where we assembled two samples at the beginning of the production process. This allowed us to verify the functionality of the design before proceeding with a "larger" assembly run.
* first samples seperatly service: We offer a service where you can get the first samples in the beginning of the production. You order the assembly of 15-105 pieces, However, we can build one or two samples/panel first, which we can deliver to you. This service is ideal if you would like to test the new design and modify something in the BOM based on the results of the first two samples or if you just want to verify the functionality before the bigger assembly run.
Basically this small project was divided into multiple subtasks, such as:
Design the circuit, size the components, implement the schematic
Do breadboard prototyping, review the schematic and measurements
Design the layout
Design review
PCBA Prototyping
Verification of the device
During design of a product it is always a good way to make a small breadboard prototype. We can test the idea, the functions simply if we use this. In the design we have an analog circiut where the capacitors, resistors are need to be tuned into the proper levels. We need to check if the output voltage is stable with different load conditions and verify the output voltage ripple, does it fit into the LDO specification or not. We can use a couple of instruments in this process, e.g. oscilloscope, dc electric load, multimeter, labor supply ...etc.
Overall, the project was a success, during this collaboration work we didn't just design circuits - we SPARKLED, brought creativity, and expertise to the table.
Do you have question? Let us know.
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