23-09-2016, 02:51 PM
1455881661-realtimebatterychargingsystembyhumanwalking1.doc (Size: 176.67 KB / Downloads: 7)
ABSTRACT: With the extend use of technology, it has been the vital function to develop something new in both software and hardware. A worn out battery or a lost charges are the two difficulties every electronic device user undergoes through. To overcome this we, the biomedical engineering students, have proposed a new technology to adopt charging of these portable electronic devices with the help of human walking. Walking is the best and common activity in day to day life. As per the study of biomechanics, we came to realize that ground reaction force (GRF) exerted from the foot, when converted into voltage gives enough power supply to run a device. While walking the person loses some energy from foot in the form of vibrations which are sensed and converted into electric form. Piezoelectric crystal does the work of generating output out of foot moment. Piezoelectric materials have the capability of absorbing mechanical energy from surroundings, especially vibrations and transform it into electric energy that can be used as power supply in real time to other appliances like mobile phones, power banks, various small handy biomedical instruments etc. This project can be implemented while jogging in the morning, gym, walking on trade-mill, in dense populated areas like railways, bus stands, etc
INTRODUCTION
The world’s energy consumption is at an all the time high with the demand continuously increasing. With the advent use of portable machines in this technological world; it has become a major issue of power source. The situation brings up several challenges that need to be addressed.
1.) Power supply.
2.) Battery discharging.
3.) Availability of power source.
End with turning off the machine without battery
In Biomechanics, the ground reaction force, GRF is the force exerted by the ground on the body in contact with it. For example ,a person standing motionless on the ground exerts a contact on it which is equal to the person’s weight and at same time an equal and opposite GRF is exerted by the ground on the person .Thus, as the human starts walking, this GRF increases which generates power in greater amount as shown in figure 1
The utilization of waste energy of foot power with human locomotion is very much relevant for highly populated countries where the roads, railway stations, bus stands, temples, etc. The human bio-energy being wasted if it can be made possible for utilization it will be very useful energy sources.
Although small electronic devices are mostly powered by batteries, there are an increasing number of wireless sensors using energy harvesters instead of the batteries. For consumer electronic devices, there are different emerging technologies that are under research or in commercialization stages. Harvesting energy from humans is particularly useful for not only common people, but also for soldiers’ portable electronic equipment. These harvesters produce energy from human’s kinetic energy, thermal energy or body biological processes energies and they can benefit soldiers by decreasing the carrying load, patients by increasing the lifetime of the devices and reducing the number of surgeries to change the battery of the devices and consumer electronics users by providing a green and endless source of energy.
In future, it could be more beneficial for a lot of applications especially for consumer electronic devices. The energy scavenging fruman’s temperature has been studied and it was shown that it is capable to produce a very limited amount of energy that cannot charge any device properly. Thus, the energy harvesting with biological sources like walking is our main goal.