The present invention is in the field of continuous generation of energy using an electromechanical assembly on both sides of a stepping platform and conversion of the mechanical energy to usable DC power generation either by way of transducers which may be piezoelectric or by converting the linear displacement produced in the stepping platform to rotational motion which can then drive the shaft of a PMDC generator.

BACKGROUND OF THE INVENTION
In today’s world, energy consumption is increasing day by day, so energy harvesting is the need of the hour. As conventional energy sources are limited and cause pollution, there is need to find out innovative methods to generate eco-friendly, sustainable energy that can be commercially used to meet the low power requirement at certain public places. Therefore, engineers are working to find out new technical solutions to generate energy by non-conventional sources which cause minimal pollution and generate no e-waste.
Human body weight can be effectively harnessed to generate electrical power for storage and utility work. In this invention a new system is proposed and designed that employs pulses generated by human weight on a certain platform to produce DC sustaining voltage. This system converts weight of walking humans at crowded places to mechanical energy which is further converted into sustainable electrical energy.
In this invention, a robust mechanical-electrical mechanism is used to convert weight energy to rotational motion and then further to electrical energy. Electrical energy charges the rechargeable battery /super capacitor to drive DC loads.
The invented system is also designed using electro-mechanical devices coupled with active piezoelectric transducers that converts human weight pulses on a platform to sustainable mechanical rotational energy that drives the DC generator to provide electrical voltage. The generated voltage charges a super capacitor or rechargeable battery to store electrical power to drive power DC loads.
For continuous generation of electricity, continuous rotation of PMDC generator is required which can be achieved by spiral spring and flywheel concept.
Similarly, active piezoelectric transducer requires continuous vibrations for generating continuous electric charges. But input is in the form of intermittent pulses. which can be fixed by using the piezoelectric transducer on elastic plate. After receiving pulses elastic plate vibrates, piezoelectric transducer generates continuous electric signal.
For fast charging of rechargeable battery /super capacitor high current is produced by connecting all piezoelectric transducer amplifier in parallel with individual diode and all PMDC generator voltage is connected in series to enhance the voltage rating.
This prototype design is conveniently modified for commercial set-ups by increasing the number of coupled PMDC generator and increasing the radius of fly wheel to generate more power. Also the same electro-mechanical assembly can be used in both sides of the platform.

OBJECTS OF THE INVENTION
1. The primary object of invention is to shift the focus from fossil fuels and other conventional energy sources.
2. Another object of invention is to develop sustainable, inexhaustible and continuous generation of electricity.
3. Another object of invention is to harness the abundant human potential energy in the form of body weight at places where the footfall is high such as railway stations, places of worship and shopping malls.
4. Another object of this invention is to design an inexpensive mechanical assembly for sustaining rotational motion based on weight pulses.
5. Another object of invention is to integrate active piezoelectric crystals for sustainable DC electric power output.

SUMMARY OF THE INVENTION
This invention uses a robust electro-mechanical device which is used to convert the mechanical motion obtained from weight pulses to sustainable electrical energy.
The device is suited to harness energy at various places such as: entrance gate of bus stands, railways stations, metro stations, airport, shops, malls, banks, temples, churches, schools, institute, fairs etc. or any other public places at security checks, at weighing stations and in weighing machines, in exercise equipment and in industry where vibration mechanism is available, at remote area to generate electricity by weight pulses and during natural disaster when the grid electricity is cut off.
Platform will be specially design in such a way that as the weight will fall upon it, it will be pressed inside and this linear displacement will be converted into rotational motion using chain-freewheel mechanism, gears, springs, flywheels, free wheels will get regular rotation which will be used to rotate shaft of generator to produce electrical energy.
(a) Generation of energy from the combination of three steps.
i. Linear displacement applies force on piezoelectric transducer. Output of transducer is rectified by a rectifier circuit to get DC from AC signal.
ii. Linear displacement converts into rotational motion by chain-freewheel. This rotational motion winds the coiled metal strip i.e., the spiral spring to full kinetic energy which is similar to mechanism of wind-up toys or clocks. This system is further coupled with PMDC generator.
iii. The rim is connected with freewheel which further is coupled to flywheel. Shaft rotates the fly wheel and this fly wheel is coupled with more than two PMDC generators.
iv. Similar mechanism can be mounted on both side of the platform.
v. Connecting the generated DC voltages in series and parallel for appropriate power, voltage and current output.
Further, the working prototype of the device is successfully fabricated and many laboratory experiments were conducted to ascertain its working performance. Results obtained thereafter prove the effectiveness of the system to provide useable electric energy from weight pulses. The stored power is further used to drive DC loads such as LEDs light.
In future, with a few modifications in design with higher range components, the system will be able to generate more power and can be converted into a suitable energy harvesting system from human weight pulses. The system can easily be installed at crowded places such as security check points, entrance gates of railway stations, commercial building, mall, shopping complex etc. to tap human weight pulses on the platform. The platform coupled to mechanical components generates mechanical rotational energy to drive DC generator that charge the rechargeable battery /super capacitor for sustaining regulated DC power output.

BRIEF DESCRIPTION OF THE DRAWING
The present invention will become more understandable from the description given herein and the accompanying drawings below. These are given by way of illustration only and therefore not limited to present invention and wherein:
Figure 1 illustrates energy harvesting electromechanical device.
Figure 2 illustrates Functional block diagram of the energy harvesting electromechanical device Figure 3 illustrates PC based virtual instrumentation. system for testing the performance of the energy harvesting electromechanical device.
Figure 4. illustrates Working methodology of the energy harvesting electromechanical device.
Figure 5. illustrates Variation of voltage of super capacitor during charging by weight pulses using the energy harvesting electromechanical device.
Figure 6 illustrates Test results of the energy harvesting electromechanical device on virtual instrument panel.

DETAILED DESCRIPTION
The following presents a simplified description of the invention in order to provide a basic understanding of some aspects of the invention. This description is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form.
Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.
By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.
It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

Embodiments
Referring to the figures, and more particularly to Figure 1, device (100) comprising mechanical and electrical subsystems with special components integrated together to form a workable system. Mechanical subsystem further comprises a rectangular platform (102) and two plates, one moveable plate (104) and other fixed plate (104’) connected through spring (124). The input to the system in the form of human weight pulses is applied on the moveable plate (104). As the human steps on the moveable platform (104), the plate through the spring (124) moves downward and presses the lower plate (104’). The drawer slide connected to the lower plate (104’) undergoes linear displacement and drives other mechanically coupled devices. The drawer slider is also connected with the lever (128). Lever (128) is used for driving bicycle chain (116) and first freewheel (122). This converts the linear displacement of the platform (120) to rotational motion. Further, bicycle wheel (116) and second freewheel (124) attached to the assembly amplifies (x4) the rotational motion. Stored energy in flywheel (114) and spiral spring with gear box (112) help in sustaining continuous rotation during the time when there is no weight pulse.
Electrical subsystem consists of group of DC generators (118) and piezo electrical transducer (122) with associated processing units to harness rotational and vibrational energy generated by mechanical assembly to charge the battery. Group of DC generators (118) are fixed on the circumference of the flywheel (114) to tap rotational energy and generate electrical output. Piezoelectric transducers (122) are seamlessly connected on the fixed plate (104’) of the platform (102). Continuous generation of vibration energy on the piezoelectric transducer (122) due to the weight pulses on the fixed plate (104’) generates variable AC voltage that is converted to DC and regulated. The electrical DC power generated by the individual sources is processed and integrated (series/ parallel connections) to charge a battery or super capacitor through a charge controller.
For continuous testing the performance of the proposed energy generating system, a PC based virtual instrumentation system is also implemented. Figure 2 shows the schematics of PC based virtual instrumentation system for testing the performance of the proposed system. The electrical generated output voltage of different sources and battery voltage, through the respective interfacing circuit are connected to the analog input channels of data acquisition device (NI 6009). A dedicated virtual instrument program with GUI allows the user to test the system performance by applying the input weight pulses and graphical monitoring time-variations of the generated voltages of various power sources along with battery voltage. Further, the data of each test is dynamically logged in host PC for post analysis.

Table 1 summarizes the preferred components of the electromechanical energy harvesting device

Referring to Figure 2 in an embodiment functional block diagram of the electromechanical energy harvesting device.
Referring to Figure 3 PC based virtual instrumentation system for testing the performance of the electromechanical energy harvesting device.
According to an embodiment when the input weight pulses greater than 32kg is continuously applied with time, rotational energy is sustained up to more than five seconds in the system.

Figure 4 illustrates working methodology of the electromechanical energy harvesting device explaining step-by-step procedure of energy conversion mechanism. Electrical energy is generated by the combination of different actions associated by the mechanical subsystem (chain-freewheel mechanism, gears, springs, flywheels, freewheels) in driving the active transducer and DC generators. By increasing, the radius of the flywheel and number of coupled PMDC generator the electrical power output of the system can be enhanced.

According to an embodiment, to analyze the working performance of the electromechanical energy harvesting device, various tests were conducted. In one of the preliminary test, the system was subjected to continuous 10 weight pulses of 52 kg with time increment of 5s or more. Maximum generated voltages across the generator with and without regulator were recorded and indicated in Table 2. In another test, two series connected super capacitor of 2.7V was charged by the regulated voltage with increased current output of parallel connected two generators (figure 5). As the weight pulses of 52kg were applied continuously after a gap of 5s, the voltage of the super capacitor (two series connected supper capacitor of 2.7V) started increasing gradually and reached to 5.21V after 600 pulses. Further, the performance of the system was also tested on a PC based virtual instrument panel. Human weight pulses of 60kg were continuously applied on the platform with time increment of 5s or more and real time data was recorded on the virtual instrument panel as shown in Figure 6. As the weight pulses were applied, the step up output voltage of generators 1 and 2 varied and remained within 25V as indicated on the panel graphs 1 and 2 respectively. Consequently, appreciable output power generated by the parallel combination of generator that smoothly and efficiently charged the battery connected at the output. In response to the weight pulses applied for shot time span of 140s, the battery voltage varied and increased from 23.8V to 24.4V as indicated on graph 4, thus providing the proof of concept of DC power harvesting by weight pulses for low power loads.

Table 2 Summary of electrical parameters of generated DC power of different generators without and with regulators under 52 kg of weight pulses

Conclusion: A prototype model of the proposed electromechanical energy harvesting system using human weight pulse has been designed, developed and tested. The working performance of the system has been tested using different input weight applied on the system with certain time increment and generated output voltage is used to charge the battery or super capacitor. The DC voltage generated is appreciable and the results produced are consistent. The convincing preliminary results obtained indicate that the energy harvesting electromechanical device can be implemented for practical purposes in places such as railway stations, air ports, shopping complex, movie theater etc. certain security checks wherein occurrence of human is frequently to harness useable energy from the waste energy of human weight pulses. This energy harvesting electromechanical device is an innovative, low cost concept of generating green sustainable energy
With a few modifications in energy harvesting electromechanical device, the device can be utilized for vehicular weights at weighing stations, toll plazas and speed road breakers to generate electrical energy. It can also be used at the entrance gate in parking areas.
Further, the electromechanical energy harvesting device can be redesigned for high ranges to generate 0-24V DC voltage for the DC grid.

CLAIMS:We claim
1. An electromechanical energy harvesting device (100) comprising mechanical and electrical subsystems, wherein mechanical subsystem further comprises a rectangular platform (102) and two plates, one moveable plate (104) and other fixed plate (104’) connected through spring (124), a drawer slide connected to the lower plate (104’) and the lever (128), bicycle wheel (116) and second freewheel (124), flywheel (114) and spiral spring with gear box (112); the electrical subsystem comprising of a group of DC generators (118) fixed on the circumference of the flywheel (114) and piezo electrical transducer (122) seamlessly connected on the fixed plate (104’) of the platform (102).2. An electromechanical energy harvesting device (100) as claimed in claim 1, wherein as the human steps on the moveable platform (104), the plate through the spring (124) moves downward and presses the lower plate (104’).
3. An electromechanical energy harvesting device (100) as claimed in claim 2, wherein the drawer slide undergoes linear displacement and converts the linear displacement of the platform (120) to rotational motion.
4. An electromechanical energy harvesting device (100) as claimed in claim 1, wherein continuous generation of vibration energy on the piezoelectric transducer (122) due to the weight pulses on the fixed plate (104’) generates variable AC voltage that is converted to DC and regulated.
5. An electromechanical energy harvesting device (100) as claimed in claim 4, wherein the electrical DC power generated by the individual sources is processed and integrated (series/ parallel connections) to charge a battery or super capacitor through a charge controller.