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Week 1 Basic Design Introduction Mobile phone is now an essential part of our daily lives, it plays an important part in communication, photography, social networking, etc. We have all more or less encountered the situation when the battery of our phone is running low and can not find a place to charge the phone. The power bank has become popular based on this, our project aims to a deliver solar power phone charging device, i.e, a power bank with solar panels on it. With this, we would be able to extend the usable time of the power bank by charging the power bank whenever there is sunlight or when we forget to charge the power bank before leaving home. Additionally, it is environmentally friendly since solar power is renewable energy. Structure design The components included in the circuit: 1. Tp4056 chip * 1 2. 3.7V, 10.4Ah Li-ion rechargeable battery pack * 1 3. Toggle switch * 1 4. 5V solar panel * 2 5. LM2577T-ADJ * 2 6. 5V 1A micro USB charger * 1 7. 1N 5821*1 8. 100uH ind
Week 2-Group meeting Our team had a meeting after discussing some detailed problems and expressing our concerns about the project with our academic advisor. The things we have covered Tp 4056 is a chip that prevent the battery pack from being over-charged as it could automatically shut down once the voltage across the battery pack reach the maximum charging value of 4.2V. Red light indicates that it is being charged and blue light would appear when finished. Tp4056 is easy to get overheated as we found out last week when experimenting with the circuits. We later discovered a possible reason that caused it could be because the input current has exceeded the required maximum current for tp4056. For maximum 1A, we have put it into work with 2.2A input. Figure 1: TP4056 During this group meeting, we recognized several more components we would like to order, including the toggle switches that are used to separate the circuit in case the battery would be charged and discharged at the same
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