Ergonomic fast battery
|Duration:||Spring 2018 - Fall 2018|
|Team Name||Team chidori|
- 1 Project overview
- 2 Budget
- 3 Design
- 4 Testing
- 5 Team Information
- 6 Documentation Archive
Bicycle dynamos are nothing new, but charge-while-you-ride technology has improved by leaps and bounds in the last few years.These days you can charge just about any device that uses USB power using your own physical exertion, including smartphones, tablets and rechargeable lights.
Design a charge device that can fast charge just about any device that uses USB power using your own physical exertion, including smartphones, tablets and rechargeable lights.
charge smartphone fast.
portable and reliable cellphone charging
ensure enough power and steady voltage.
designing a phone charge that uses power generated from the bicycle. A normal phone usually use 5V charge and a USB. So our goal is to able generate electricity from the bicycle that can give an out put of 5V by using a USB output. As a group project, we have pinpointed our design constraints, we divided the project as 3 parts: generator, DC-DC converter(to constant the variable input), battery. And we will focus on designing the DC-DC converter.
The average power generated by a person is about 150W at 120 Rpm. Highest power that an cyclist reached is 1100W at 320 rpm. while selecting parts a higher power rating is preferred.
Important Using Devices
|we choose a 24V 600rpm 100w AC permanent magnet generator. The ratio of rotating speed and voltage is constant. However, it's an AC generator, we need to use an AC-DC converter. The work region for riding a bicycle is 0-300rpm, so the generator can output 0-12v voltage.|
|We use this AC-DC converter pcb board to get a fixed voltage DC current.And it's input work region is 5.5v-16.5v and the output is 15v.|
|To charge the capacitor, we need constant current. We use a buck converter as a current rugulator.For this, it's output can be control.
Input Voltage: DC 12V Input Current: 1.45-4.167A Output Voltage: 2.5-7.14V Output Current: 7A(fixed)
|This capacitor is super-capacitor, it has a large capacity, but it can't load a high voltage. We use a combination of several super-capacitor serious connections to get a high capacity and load the voltage we need.
3 capacitors in series. Total C=500F Total Vdc=8.1V Effective energy storage 3.5w·hr Maximum energy storage 4.5w·hr
|we use a buck converter to output constant 5V,3A. It means we can charge 2 phones at same time.
AC-DC pcbboard diagram
We use an unstable volatge supply to simulate the bicycle generator output, and this is the plot of the input power,(W-t diagram)
We test the voltage in the cap combinations, and this plot is the V-t diagram of the voltage in the caps
Chensheng zhu is a senior in Electrical engineering looking at graduate in December 2018 from the University of Idaho. His favorite sports are basketball. The most favorite of the project has been learn more about how to controlling the circuit. After graduate he plans he plans on going to study Master's degree.
Meiyuan Zou is a senior in Electronical Engineering. He is looking to graduate in December 2018. His favorite sport is basketball. His hobbies are travel, watching movie and playing video games. After graduating from the UI, he plans on going to study Master's degree. His favorite aspect of the major is about power.
Chenghao shi is a senior in Electrical engineering looking at graduate in December 2018 from the University of Idaho. His favorite sports are basketball and hiking. The most favorite of the project has been learn more about how to get stable voltage. After graduate he plans on internship at power company.
I am from India currently pursuing undergraduate in electrical engineering. I wish to establish a career in the power engineering sector. I started at University of Idaho in 2014 as an international student.