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1. A
TECHNICAL SEMINAR
ON
WALK AND CHARGE
Presented by Under Guidance by
SUPRITH E Mrs. SUSHMITHA DEB CHAUDHURY
4SM20EE022 Asst. Prof. Dept of EEE
8th SEM EEE S J M I T Chitradurga
S J M I T Chitradurga

2. Abstract
Due to our hectic and torpid lifestyles, health has been on the receiving end. Here we discuss a device using
piezoelectric material that furnishes as an alternate means for powering mobile devices, etc. Additionally, it can
also be intended for emergency lighting solutions like flashlights and emergency torch. Noting that it is an
energy regeneration device it encourages walking and thus can also be acknowledged as an electrical health
gadget which endorses physical fitness.

3. CONTENTS
1. INRODUCTION
2. PRINCIPLE
3. WORKING
4. APPLICATION
5. ADANTAGES
6. DEISADVANTAGES

4. INRODUCTION
A phone is no longer an item used only for communication; it
has become smart. Thus, it requires a larger battery to keep it running
throughout the day. But since it is not at all feasible to expand the MAh
value of a battery endlessly, therefore we need to supplement it and what
better than recharging it with a renewable resource. Thus, herein we are
designing a portable charger whose energy will be equal to the number
of steps we take.

5. PRINCIPLE
The elementary principle involved is the transformation of human mechanical power into electrical signals. The
mechanical power generated is due to the trotter moment of our ankle. When a person is walking or running, he
possesses a certain amount of kinetic energy and thus applies some amount of pressure on the ground via the
shoe and this is the pressure we are concerned with and are utilizing in our product development.
The device is clamped on one leg using a Velcro strap and a hole lets out
a nylon string that is attached to the leg that helps in the conversion of
The displacement into rotary motion.

6. WORKING
• The application of this gadget is entirely based on human pressure and trotter
movement of our ankle.
• Here the mechanical stresses and voltages are used to generate power via the
piezoelectric transducers which are put in our shoe.
• This vibrational energy is changed into electrical energy by the transducer.
• The productivity of the transducer system is then fed into a modifier circuitry that
consists of 3 subsystem.
1. Voltage amplification (by adjusting the voltage gain)
2. Rectification (DC-DC converter) – which converts pulsated DC to fixed DC
3. Current amplification – this increases the current to a value 20X the value

7. APPLICATION
• Charging electronic gazets.
• In street lighting and highway lighting.
• Stored energy ca be used in other application.

8. ADVANTAGES
• Emission free means of energy production.
• Getting two jobs done together walking as well charging
• Good for rural areas as they are power scare zones
• Helping military personnels charging their GPS devices and other gazets
• Providing alternate way of wall based charging

9. DISADVANTAGES
• Very low power generation
• Dynamic based device may be little heavy
• Walking is necessary for device to work
• In rainy season it can’t be used outside in flooded areas