Questions tagged [energy-harvesting]

Energy harvesting devices generate power from an external source. While they may include solar, kinetic and other energy sources that are also used on a large scale the term is normally reserved for small low-power applications. An example is a wristwatch that uses kinetic energy while the wearer is walking to power the watch.

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127 views

Simple RF energy-harvesting circuit

I wanted to dabble a bit in RF energy harvesting. Nothing fancy, just see what's possible. I came up with the following circuit, but I'm a complete layman when it comes to antennas and the like. ...
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27 views

Piezo Energy Harvesting: Power Balance

I am doing some piezo and energy harvesting tests, but I am having a hard time calculating the available energy balance. I setup a voltage and current measurement for both the energy harvesting input ...
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55 views

Magnetic induction with varying rpm: Dealing with excess energy

I would like to get some advice regarding the following scenario: I want to build a cheap, small generator for an energy harvesting application. There are magnets on a rotating shaft and off-the-shelf ...
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1answer
53 views

Turn on power when voltage higher than set value

We are trying do design a circuit which works by harvesting energy from a split core current transformer. Most of the electronic works correctly, we use a 1.5F 5.5V SuperCap to provide enough power ...
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1answer
65 views

Probing with oscilloscope causes current drop

We are testing a fabricated chip with expected output current of around 4mA which is then used to charge a button cell. The input is from a PV cell. However, when we attach an oscilloscope probe onto ...
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5answers
374 views

Diode type with lowest drop voltage [duplicate]

I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ? Thank you
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48 views

Solar power pump - Design critique and help

Okay so, I have a design that 'works' on the breadboard. But I feel like it could use some improvement. Here is my current design: simulate this circuit – Schematic created using CircuitLab ...
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0answers
24 views

Is there a Energy Harvesting Power Management and Battery Charging EVM dev kit (e.g. BQ25504) with easily adjustable voltage thresholds?

I have a BQ25504EVM-674 Energy Harvesting Power Management with Battery Charging (EHM) development board by Texas Instruments. It fulfills my requirement of charging an energy store (e.g. supercap/...
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118 views

Is it possible to power a MCU with a button press / touch? [closed]

I hope to use a piezoelectric button to harvest and produce a sufficient energy burst to power ON and bootup a MSP430 for a few ms enough to update a simple data structure (e.g. two integers stored in ...
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81 views

Transfer of Energy from Initially charged capacitor to uncharged Capacitor

I have started to learn about LC circuits, Specifically, I am simulating a case where the initial conditions are where one large capacitor (100F) has previously been charged to 1.3V, considering the ...
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301 views

How to calculate the impedance of a rectifier?

I am working on RF energy harvesting. Now I am trying to calculate the impedance of the rectifier, in order to do the impedance matching. An antenna (50 ohm) receives RF signal (915 MHz) and finally ...
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150 views

“RF energy harvesting” Can rf transmitter be a rf signal generator?

I'm trying to build an rf energy harvester. But having some problem. The harvester should collect the 915MHz signal. Can I use 915MHz RF transceiver + 915MHz amplifier as the rf signal source? How ...
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139 views

UVLO for Energy Harvester circuit

A good background on the problem can be found in the document: (Under Voltage Lock-Out Design Rules for Proper Start-Up of Energy Autonomous Systems Powered by Supercapacitors). The above document ...
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32 views

Data communication in power harvesting project

I want to design a wearable gadget for elderly to detect falling. This gadget should work by energy harvesting. Now I want to find the best effitient way of power consumtion to send data to a station ...
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1answer
52 views

Harvest energy from ultra low current and high voltage source?

I have a sensor which can produce voltage upto 10 V but can only produce 50 nA of current. I tried to harvest energy using TI's BQ25570 evaluation board but the current is too low to kickstart the ...
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49 views

Help required to design a suitable energy harvester for TENG

So I am in the process of desgining a scalable Triboelectric Nanogenerator(TENG) through which I can easily harvest and store electricity in a battery or a capacitor. A TENG can be modelled as voltage ...
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1answer
29 views

How to do high switched current from small solar

I am working on a small, solar-powered application that makes use of RF and a few higher-power sensors. Those will only be on for a fraction of the time, but might consume 1A-2A at 3.3V. The ...
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1answer
45 views

Outdoor versus indoor amourphous silicon solar cells

I've read in a few articles that amorphous silicon (a-Si) based solar cells have a greater spectral response for indoor light conditions here. If this is the case, then why manufacturers emphasize ...
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1answer
76 views

Moving a magnet through coils wound in the opposite direction

Suppose I want to harvest kinetic energy by moving a magnet back and forth through a coil assembly. Faraday flashlights work by this principle, but to my knowledge those usually only have one coil. ...
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1answer
154 views

unknown op-amp current leak

I've created a dual source energy harvesting board to store energy from small energy sources, like a 3V 15mA solar panel, into a 3F 2.7V supercap and to power a small wireless node (3.3V, 30mA), but I ...
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2answers
70 views

Maximum Power Point Tracking for multiple sources

I know there are several commercial products for maximum power point tracking for a single power source (solar cells for example). But does anyone know any solution for the case where there are ...
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0answers
75 views

Voltage regulator outputs some voltage even if in shutdown

I've created a dual source energy harvesting board to store energy from small energy sources, like a 3V 15mA solar panel, into a 3F 2.7V supercap and to power a small wireless node (3.3V, 30mA), but I ...
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2answers
669 views

Current Transformers and Energy Harvesting

Current Transformers (CT)s work like any other transformer: through Faraday's law of induction, the changing magnetic flux (from the AC current flowing through the conductor) induces a proportional ...
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1answer
260 views

Is it possible to cut flexible solar PV panels down to size to suit small IoT type devices? [closed]

I've been looking for a supplier for tiny (approx 10mm x 30mm x 1mm) PV cells that you find on solar powered calculators without any success. Is it possible to cut a larger flex amorphous Si panel ...
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1answer
467 views

Brushed DC motor as generator, characterising the motor

I've read through the several topics here concerning using a DC motor as a generator but I've failed to answer my question so, apologies, I'm going to ask again. I need to use a small DC motor as a ...
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1answer
198 views

Nanovolts to millivolts signal amplification [closed]

I need to amplify a weak signal(few nanovlts) from solenoid to few hundred millivolts. I am working on an energy harvesting device but I am unsure of the output since the DAQ(HP 34970 A) works in ...
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407 views

Solar charging a lipo battery with ESP8266 as a battery load

I am trying to add solar harvesting capability to my IoT device based on esp8266. I am using linear charge controller (MCP 73831) with solar input to charge a 500maH lipo battery. An observation when ...
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2answers
317 views

RF Voltage Multiplier

My project partner and I are working on making a rf-dc energy harvesting circuit capable of lighting an LED (even intermittently) or trickle charging a coin cell battery over a long time. We are ...
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2answers
610 views

Flash an LED with an extremely low power source

Let's say I have a very low power solar cell, which is producing a couple of uA of current at 100-200 mV for an output power of a few hundred nW. What I would like to know is what is the best (most ...
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1answer
1k views

What is the typical power that is transmitted through NFC from a smartphone

I think the question is clear. I only need a reference value, like is it in the range of 1mW or 10mW or 100mW. Clearly this will vary among smartphones. Also do you think it is possible to set the ...
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1answer
85 views

Input of boost converter or charge pump in the energy harvest [closed]

I read some paper about the energy harvest, and lots of paper said the induced voltage from, for example, the thermo-electric harvesting could be as low as tens of millivolts in a realistic case, so ...
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1answer
123 views

Thermoelectric Generator output computation

Can I compute the output voltage of a thermoelectric generator? I want to compare the theoretical and actual values (generated voltage) of a thermoelectric generator. I'm about to use TEC-12706.
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2answers
221 views

LTC3525 Shutdown feature reacts to wrong thresholds

I've be thankful if somebody can help me with my energy harvesting board problem. I've created an energy harvesting board based on the step-ups Linear Technology LTC3105 and LTC3525-3.3. Below please ...
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2answers
288 views

Amplifying 10-30mV into at least 5V

My thesis title is "Powerbank with sound to eletrical energy converter" meaning I'll be using sound to charge the powerbank, and I decide to used dynamic microphone instead of condenser microphone ...
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1answer
216 views

Low voltage AC to DC for energy harvesting

For an energy harvesting application, I need to charge a capacitor using induced voltage due to the movements of a magnet inside a coil. The generated voltage is typically low frequency AC (4-5 Hz) ...
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1answer
434 views

Teg energy harvesting by ltc3108

I am currently doing a project regarding thermal energy harvesting using TEC Peltier modules and LTC3108 IC chip. This IC chip requires inductors that act as transformer to step up the voltage input. ...
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1answer
97 views

Energy Harvesting IC datasheet question

I am experimenting with energy harvesting using electromagnetic induction. I am using the [LTC3108(Ultralow Voltage Step-Up Converter and Power Manager) circuit. ==>http://cds.linear.com/docs/en/...
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2answers
258 views

Thermoelectric Energy Harvesting

I'm building a project based on ltc3108, Linear Technologies IC, and the Peltier cells, TEC 12706. The basic idea is to recharge a battery by the temperature difference between the body-skin and the ...
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1answer
1k views

Parallel coupling of piezoelectric

I'm trying to couple multiple piezoelectric discs as parallel to get electrical energy through vibration. using LTC3588 rectifier , which way is correct: wiring all piezo parallel,then connect output ...
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1answer
80 views

Storing short, small, intermittent pulses of energy

I am running an experiment using graphene at the moment to create energy from different chemical solutions. A link to what I am building on is below: https://phys.org/news/2014-04-team-electricity-...
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1answer
126 views

how to calculate the power of the energy harvester

this is a tough question for me.looking for your guys's help.This energy harvester use DC motor to collect the energy.And an external electrical load R is connected to the generator,i got an ...
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1answer
342 views

In a single diode rectifier circuit, is capacitor offering additional energy to Load?

I am a graduate student majoring in electrical engineering. Now, I am studying about wireless power transfer and energy harvesting. While reading a paper written by Bruno Clerckx, who is senior member ...
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1answer
48 views

question on diode in the Energy storing circuit

Please consider the following circuit. For this case, my following notion is correct? When v(t) is greater than diode turning-on voltage (v_d), the forwarding current (i_d) occurrs, and then energy ...
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2answers
716 views

RF to DC convertor [closed]

I am working on RF energy harvester and I want to increase the current. Should I connect more rectifiers in parallel to one antenna or more antennas to one rectifier? Here is my schematic. My antenna ...
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1answer
103 views

Powering a li-ion battery from a TEG

For a project, i would like to power a li-ion battery from a TEG. For that, i use a step-up converter called LTC3109 developed by linear technology but it was limited in current. I intend to create a ...
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1answer
173 views

Automatic switch between parallel and series connections

I need advice if it is possible to replace switches ( see drawings ) with suitable transistors and other parts. Requirements: Base leg voltage to "open" transistor ~0.2 - 0.3 Volts. Transistor ...
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1answer
359 views

How to design the rectifier??

I am going to use rectifier circuit (attached in below) for consumer application (mobile). I tried this schematic design in virtuoso (cadence). I consider rectifier input voltage=1V and based on this ...
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1answer
679 views

How to design CMOS bridge rectifier?

I designed the bridge rectifier circuit. I wnat to make a full-wave rectification. so, I made a CMOS circuit. I refered to other papers. Figure2. "An ultra-low-voltage self-powered energy harvesting ...
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212 views

What should I keep instead of this energy harvester breakout for maximum efficiency of the solar and supercaps circuit?

This is my circuit which charges the supercapacitors. The problem with the circuit is the minimum input voltage require to get 3.3 volts output. Once the input voltage goes below the certain level ( i ...
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1answer
313 views

Bipolar energy harvesting circuit

I'm planning an energy harvesting circuit using LTC3105 (400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up). The problem is that my energy source is bipolar, although ...