WIRELESS BATTERY CHARGING VIA FOOTWEAR BASED PIEZO-ELECTRIC ENERGY HARVESTING

Abstract

The titled invention "a wireless battery charging via footwear based piezo-electric energy harvesting" offers a sustainable and convenient power source for portable devices, utilizing the mechanical pressure from walking to generate electricity. This 10 invention typically includes a footwear (1 ), a piezoelectric sensor system (2), a voltage tripler circuit (3), a voltage regulator (4), and a processor (5). This invention has applications in powering wearable devices, smart shoes, and other portable electronics.

Specification

FIELD OF INVENTION
5 The present invention is related to renewable energy and wearable technology
domain. Particularly, the present invention is relates to an innovative solution to the
challenges of mobile phone charging through traditional methods. More particularly,
the present invention is relates t<? a wireless battery charging via footwear based
piezo-electric energy harvesting. This invention offers a sustainable, convenient, and
10 self-sufficient power source for wearable devices. This invention has applications in
powering wearable devices, smart shoes, and other portable electronics.
Prior Art:
15 This invention relates to a wireless battery charging via footwear based piezo-electric
energy harvesting. Charging mobile phones using traditional methods is becoming
increasingly challenging. The number of mobile users is growing, while the availability
of charging ports is decreasing. Additionally, extended pho~e usage often leads to
physical inactivity and mental stress. To address these issues, the proposed energy-
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25
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harvesting piezo-based footwear offers multiple solutions. This innovative invention
tackles the rising challenge of charging mobile phones traditionally. As more people
use mobile phones, the number of available
Moreover, prolonged phone use can result
charging ports continues to shrink .
in physical inactivity. The energyharvesting
piezo-based footwear provides a multifaceted solution, allowing users to
charge their phones while walking. This approach overcomes
traditional charging methods and promotes physical activity .
the limitations of
One of prior art CN219500516U, titled "Chargeable sports shoes". The utility model
presents a chargeable sports shoe equipped with a charging control unit integrated
into the shoe body. This unit houses a charging and discharging management module,
an indicating module, a GPS positioning module, and a wireless communication
module. These components interact to store and distribute electric energy, display
charging status, track shoe location, and transmit relevant data to a mobile device.
Another prior art CN21 0578305U, titled "Shoe type power generation device". The
utility model presents a novel shoe-based power generation system that harnesses
the kinetic energy generated during human movement to produce electricity. Equipped
with a wideband energy harvesting module, the device efficiently converts mechanical
5 energy into electrical energy, which is then stored for powering external low-power
electronic devices. This innovative solution addresses the limitations of traditional
batteries, such as bulky size, short lifespan, material waste, and-environmental impact.
The power generation device boasts a simple design, robust interference resistance,
zero pollution, ease of manufacturing, portability, and wearability. Its eco-friendly and
10 sustainable nature contributes to environmental protection and energy conservation,
while fostering the development of self-powered microelectronic products.
15
Another prior art CN£168247~·1 U, titled "Wirclcce:charging f;!IP.ctric shoe and wireless
charging electric shoe system". The utility model presents a wireless electronic shoe
system featuring a main body, a gyro wheel, a motor, a power module, and a wireless
charging module. The roller, located at the shoe's base, is rotated by the motor, which
receives power from the power module. The wireless charging module, connected to
the power module, enables wireless charging of the shoe. This system eliminates the
need for wired charging interfaces, providing convenience and preventing damage to
20 the shoes due to debris or dust.
Another prior art KR20120120564A, titled "Shoe sole having energy charging
apparatus and method of manufacturing the same". A shoe sole designed to enhance
energy storage efficiency incorporates a ceramic piezoelectric element, a film type
25 piezoelectric element, and a charging unit. The ceramic piezoele~tric element consists
of two piezoelectric units joined by a spacer, each unit featuring a piezoelectric
ceramic plate adhered to both sides of a metal vibration plate with a spacer between
them. The charging unit u~ilizes a circuit to efficiently capture and store the energy
generated by the piezoelectric elements.
Another prior art US20140145450A1, "Foot-powered energy harvesting mechanisms
for insoles and shoes". The energy harvesting mechanism addresses the issue of
battery depletion in remote or inconvenient areas by utilizing the heel strike phase of
walking to generate electricity. A mechanism transforms linear motion into rotational
motion, which is then amplified by a gear train and converted into electrical energy by
a generator. The harvested energy is stored in a battery for powering electronic
devices.
5 Another prior art CN211129881 U, titled "Intelligent automatic electric type air cushion
shoe". The utility model presents an innovative automatic electric formula air cushion
shoe equipped with a treater, data storage module, pressure sensor, display module,
battery, and other components. The treater's output electricity is connected to the data
storage module and display module, while its input electricity is linked to the pressure
10 sensor and battery. This interconnected system enables intelligent automatic electric
formula functionality, enhancing the air cushion shoes' shock absorption capabilities
and providing improved practicality for the wearer.
Another prior art KR2011 0082035A, titled "Foot-powered footwear-embedded sensor-
15 transceiver". A user-powered device, system, and method for providing information to
a pedestrian are disclosed. The system harnesses energy generated by a moving
pedestrian to charge an embedded energy storage device. within the shoe.
Microcontrollers, sensors, and transmitter/receiver mechanisms may be integrated
into the shoe, enabling communication with devices like watches, iPods, mobile
20 phones, or other portable devices. The shoe can receive signals from GPS satellites,
providing geographic location information. The flexible energy storage device can
withstand significant shoe bending, while the energy harvester efficiently recharges
the device from pedestrian steps or other sources, eliminating the need for external
charging.
Another prior art US8786246B2, "Power resource management". ·systems and
methods for recharging portable electronic devices utilize energy harvesting or
scavenging techniques. A recharge component accumulates energy from various
sources, including routine user actions like muscle movements and environmental
factors like sunlight and temperature. This accumulated energy is then supplied to the
portable device for charging, providing a sustainable and convenient power source.
Another prior art CN201683127U, titled "Dual-purpose automatic electricity-generating
eleCtrically warmed shoes". The utility model presents dual-purpose electrically
warmed shoes that generate electricity automatically. Each.shoe incorporates electric heating film and an electricity-generating module. The heating film is connected to a
temperature-controlling switch and a current condenser, while the generating module
consists of a piezoelectric crystalloid at the front sole and a unidirectional elastic airbag
connected to the heel. The airbag is linked to wind impellers on the back uppers
s through wind pipes, and the impellers are connected to mini-type electric generators.
The piezoelectric crystalloid circuits and mini-type electric generator circuits are
connected in parallel to rectifying and filtering modules, which, along with the current
condensers, are located in the middle of the midsoles. The soles also feature external
charging interfaces and switching switches for controlling these interfaces and the
10 electric heating films. These shoes effectively utilize gravity during walking and
movement to generate heat and power, offering a simple, green, environmentally
friendly, safe, and comfortable solution.
While wireless battery charging via footwear-based piezo-electric energy harvesting
15 offers a promising solution, it faces several drawbacks. The generation of electricity is
dependent on the user's physical activity, limiting its effectiveness for sedentary
individuals or during rest periods. Additionally, the efficiency of piezoelectric energy
harvesting is relatively low, resulting in limited power output. Furthermore, the
integration of piezoelectric materials into footwear can increase its weight and
20 bulkiness, potentially affecting comfort and aesthetics. Finally, the long-term durability
and reliability of piezoelectric materials in footwear environments remain to be fully
evaluated.
Therefore, the present invention overcomes the drawbacks of the prior art by providing
25 a wireless battery charging via footwear based piezo-electric energy harvesting.
OBJECTIVE OF THE INVENTION·
1. The principal object of this invention is to design and development of a wireless
battery charging via footWear based piezo-electric energy harvesting.
2. Another object of this invention is to develop a sustainable and efficient wireless
battery charging system that harnesses human motion energy through a
piezoelectric plate.
3. Yet another object of this invention is to optimize the piezoelectric plate's
efficiency in converting mechanical pressure from walking into electrical
energy.
4. Another object of this invention is designed to design a voltage regulator circuit
s that provides a consistent 5W output, suitable for charging mobile devices.
5. Another object of this invention is to contribute to integrate a matching network
that optimizes the transmission of electromagnetic signals between the voltage
regulator and antenna.
6. Another object of this invention is to integrate all key components such as
10 voltage regulator, matching network, and antenna into a compact on board
system within the footwear.
7. Another object of this invention is to utilize a meander line antenna to enhance
the wireless transmrssion of eiE:!c.:lrurnagnetic signal:;, maximizing the rrmge of
energy transfer.
15 8. Another object of this invention is to enable the transmitted electromagnetic
signals to be wirelessly received by a corresponding antenna in the mobile
device, where a voltage tripler circuit amplifies the signals for charging.
9. Another object of this invention is to create an innovative and eco-friendly
charging solution that relies solely on human motion .for energy generation,
20. reducing dependence on external power sources.
BRIEF SUMMARY OF THE INVENTION
The proposed solution utilizes human motion to generate electricity through a
25 piezoelectric plate. Mechanical pressure from walking is converted into electrical
energy, which is then regulated to a'stable 5W output. An integrated on board system
~ 30
houses the voltage regulator, matching network, and transmitting antenna, while a
meander line antenna optimizes wireless signal transmission. The transmitted signals
are received by mobile devices, where a voltage tripler circuit amplifies them for
charging. This innovative approach offers a sustainable and convenient method for wirelessly charging mobile devices using energy from walking.
BRIEF DESCRIPTION OF THE RELATED ART
The embodiment of the present invention is illustrated with the help of accompanying
drawings.
Figure.1: show the block diagram of the proposed system.
Figure.2: illustrate the experimental model of the proposed system.
Figure.3: show the working model of the proposed system.
Figure.4: illustrate the circuit configuration of the proposed system.
The proposed method offers energy ·conservation without requiring additional
resources. Walking-generated pressure is converted into voltage using a piezoelectric
plate. A regulator circuit ensures a standard oW power output, while a matching
network facilitates efficient transmission between the regulator and the transmitting
15 antenna. The transmitted electromagnetic signal is then captured by the receiving
antenna in portable devices, enabling radio frequency wireless charging. This
innovative approach demonstrates the potential for future wireless charging
technologies that leverage human motion as a sustainable power source.
The main components of a wireless battery charging via footwear based piezo-electric
20 energy harvesting, typically include:
1. Footwear
2. Piezoelectric Sensor System
3. Voltage Tripier Circuit
25 4. Voltage Regulator
5. Processor
S DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWING
1. Footwear:
It is any covering worn on the feet. It serves various purposes, including
protecting the feet from injuries and environmental hazards, providing comfort and support, expressing personal style, and serving specific functions like
athletic performance or medical needs.
2. Piezoelectric Sensor System:
This system converts mechanical pressure (like footsteps) into electrical
s energy.
3. Voltage Tripier Circuit:
This circuit increases the output voltage of the piezoelectric sensor to a level
suitable for charging devices.
4. Voltage Regulator:
10 · This circuit maintains a stable voltage, ensuring efficient and safe charging.
5. Processor:
This component controls the overall system, managing power flow, regulating
voltage,· and communicating with othen.lt~vices.
15 Generally, this invention is a sustainable and innovative technology that utilizes the
mechanical pressure generated by walking to generate electricity. A piezoelectric plate
embedded in the footwear converts this pressure into electrical energy, which is then
regulated, stored, and transmitted wirelessly to charge portable devices. This
approach offers a convenient and environmentally friendly alternative to traditional
20 power sources, particularly for wearable devices and other portable electronics.
DETAILED DESCRIPTION OF THE INVENTION:
The footwear (1) serves as the foundation for the system, providing a comfortable and
25 practical platform for the integration of the energy harvesting components. It is
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designed to protect the feet from injuries and environmental hazards, while also
ensuring a stable and secure fit for the internal components.
The piezoelectric sensor system (2) is embedded within the footwear, typically in the
sole or heel. This system is designed to convert mechanical pressure, such as that
generated by walking or running, into electrical energy. The piezoelectric material
within the sensor generates a voltage when subjected to mechanical stress, effectively
harnessing the energy from human movement.
· The generated electrical energy from the piezoelectric sensor system (3) is often at a
low voltage, insufficient for charging most portable devices. The voltage tripler circuit is designed to increase the output voltage of the piezoelectric sensor to a level suitable
for charging, typically around 5 volts. This circuit works by sequentially charging and
'
discharging a series of capacitors to multiply the input voltage.
To ensure efficient and safe charging, a voltage regulator (4) is incorporated into the
s system. The regulator maintains a stable output voltage, preventing fluctuations that
could damage the charging device. It acts as a buffer between the voltage tripler circuit
and the portable device, ensuring a consistent and reliable power supply.
The processor (5) serves as the central control unit of the system, managing the
overall operation and communication between the various components. It monitors the
10 output voltage from the piezoelectric sensor system, controls the voltage tripler circuit
and voltage regulator, and commu.nicates with the portable device to initiate and
monitor the charging process. Additionally, the processor may be equipped with
features such as energy storage, power management, and user interface
15 METHOD OF PERFORMING THE INVENTION
The piezoelectric sensor system (2), embedded in the footwear (1), generates
electrical energy by converting the mechanical pressure from walking into electrical
signals. This process leverages the natural energy produced by human movement.
20 The voltage tripler circuit (3} takes the generated electrical energy and amplifies it to
a level suitable for charging devices. This step is crucial as the initial voltage from the
piezoelectric sensor is often too low for practical use.
The voltage regulator (4) ensures a stable and consistent output voltage, preventing
fluctuations that could damage the charging device. This component is essential for
25 reliable and efficient power delivery.
The processor (5) acts as the brain of the system, overseeing the operations of all
~ 30
other components. It coordinates the energy generation, voltage conversion, and
regulation processes, ensuring that the system functions optimally. Additionally, the
processor communicates with the portable device to initiate and monitor the charging
process.
This integrated approach allows the system to efficiently harvest energy from human
motion and provide a reliable power source for wireless charging. By working together,
the components of the system maximize the energy generated and ensure that it is
delivered in a usable and safe form
ADVANTAGES:
~ It harnesses energy from human motion, reducing reliance on external power
sources and promoting environmental friendliness.
5 ~ It eliminates the need for physical connections, providing a more convenient
and user-friendly charging experience.
~ The system is designed to optimize energy conversion and transmission,
ensuring efficient use of the generated power.
~ The integrated components and voltage regulation ensure safe and reliable
10 charging, protecting both the device and the user.
~ The system can be integrated into various types of footwear, making it
adaptable to different lifestyles and preferences.
~ By utilizing reactily availablE:! 111aterials and human en&rgy, the system can be a
cost-effective solution for charging portable devices.
1/We claim:
s 1. A system for a wireless battery charging via footwear based piezo-electric
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energy harvesting, comprising:
a footwear (1) to protect the feet from injuries and environmental
hazards;
a piezoelectric sensor system (2) to convert mechanical pressure into
electrical energy;
a voltage tripler circuit (3) to increase the output voltage of the
piezoelectric sensor to a level suitable for charging devices;
a voltage regulator (4) to maintain a stable voltage, ensuiiny dficient and
safe charging;
a processor (5) to control the overall system, ma.naging power flow,
regulating voltage, and communicating with other devices.
2. The system of claim 1, wherein the footwear (1) comprising a piezoelectric
sensor system, a voltage tripler circuit, a voltage regulator, and a processor.
3. The system as claimed in claim 1, wherein the piezoelectric sensor system (2)
is integrated into the sole of the footwear.
4. The system as claimed in claim 1, wherein the voltage tripler circuit (3)
increases the output voltage of the piezoelectric sensor system to at least 5
volts.
5. The system as claimed in claim 1, wherein the voltage regulator (4) maintains
a constant output voltage of 5 volts.
6. The system as claimed in claim 1, wherein the processor (5) controls the
operation of the piezoelectric sensor system, voltage tripler circuit, and voltage regulator.
7. A method for operating a wireless battery charging via footwear based piezoelectric
energy harvesting, comprising the steps of:
a. providing footwear (1) comprising a piezoelectric sensor system (2), a
voltage tripler circuit (3), a voltage regulator (4), and a processor (5);
b. generating electrical energy by subjecting said piezoelectric sensor
system (2) to mechanical pressure from walking;
c. increasing the voltage of the generated electrical energy using said
voltage tripler circuit (3);
d. regulating the voltage of the generated electrical energy using said
voltage regulator (4);
e. wirelessly transmitting the regulated electrical energy to the portable
electronic device; and
f. monitoring the charging status of the portable electronic device using said processor (5).

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