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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216 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
315 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 ...
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654 views

How do energy harvesting ICs like LTC3106 and LTC3105 safely charge lipos?

I'm designing a simple device with a single cell LiPo that I want to be chargeable from a single solar power cell. As I start to look through the data sheets, I'm seeing that the battery charging is ...
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4k views

What is the maximum power transmitted through NFC that can be harvested?

What is the maximum power an NFC-enabled card can draw from a contactless payment terminal? What are the determinants (i.e. card reader voltage)? What techniques are available for harvesting this ...
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93 views

Paint Can Power Plant {gasification stove, steam turbine, dynamo, batteries} [closed]

thanks for stopping, here's a little update, this is not going to happen the way I'd hoped so I'm going to change my tack a little, it was suggested that I pick up an alternator so I'll do that and ...
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How to be sure that I harvest power?

I am working with an electrochemical device which (I guess) harvests power. How can I be sure that I harvest power ? My first idea was to plug a battery on my system. The problem is that my device ...
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194 views

Solar Li-Ion battery charger at low light

typically a MPPT ic such as the LTC3105 is directly connected to the solar cell. To charge a li-Ion battery, a li-ion charger ic is connected to the output. This charger ic e.g. a MAX1551 has a fixed ...
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325 views

Circuit to harvest power

I am working with a homemade material. I can harvest a power from this system. Thus a load, plugged to short cut my material, is crossed by a current. I would like to really harvest this power, it ...
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247 views

LTspice simulation problem - energy harvesting rectifier circuit

SO the circuit below is an approximation to an electrostatic energy harvesting system and device. Basically I want to observe the charging voltage waveform across the cap C3. In real life the cap ...
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1answer
341 views

Ways to Turn Electrical Energy into Kinetic Energy? [closed]

We want to build a pumpkin chunkin' launcher from Tesla Coil parts (and maybe some more). We were originally thinking a rail gun would be the closest thing to make it, but from the designs I've seen ...
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2answers
477 views

What are the ways to power 5V sensor using solar panels?

I have an outdoor sensor (which will have to work in the winter on Poland, however, we usually have temperature much over -10 Celsius degrees) which needs 5V. The sensor operates 24 hours per day ...
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1answer
113 views

Irregular output from DC Motor used as a generator?

I was trying to make a generator out of a DC motor inrunner by following this video by following this schematic: I made this structure and started testing the phase voltages. A-, B+, C- are combined ...
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208 views

Angry birds spinning toy working

I recently purchased the Angry birds spinning toy which works like this. The hand crank basically rotates and from the power generated,Dissecting the product into various parts, I came across certain ...
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How to light an LED using supercapacitor [duplicate]

I would like to light up a 3W LED from Cree having a forward voltage of 2.9 V at 350 mA. It's maximum drive current is 1 A and gives 300 lumens/m2 output. I am considering lighting up this LED using ...
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2answers
148 views

What happens to current in a RC-battery circuit when you move plates with a square signal?

I use an RC circuit connected in series with a battery. I change the gap between plates of my air capacitor (2 paralleles plates, one fixe, the other one moving with an actuator) so as to change my ...
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151 views

switching between solar input and 5V supply

I am designing an energy harvesting system from a low power solar panel. I am using the output of the solar panel to power a high efficiency boost converter which charges a single cell Lithium battery ...
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Lowest voltage drop diode possible

I am harvesting energy from an NFC device using a tuned antenna on my PCB. Though this method I am able to generate about 3.05V. I would like to charge a super capacitor using the power harvested from ...
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4answers
332 views

Combining of two or more ultra low voltage DC/DC step up converter chip's (LTC3108) output

I want to use one LTC3108 with micro solar panel and other LTC3108 with TEG panel. Can I connect two LTC3108s' output to the one battery charger chip's input (max1555 for example)?
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140 views

Energy Harvesting Primary VDD and Battery Backup VDD power for MCU

Currently I am in the design process of circuitry for my energy harvesting circuit. I am using the CC1110F32 MCU from TI. I am using the Development kit boards that they created for this project. The ...
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1answer
187 views

Can't find small supercap, 1mF [closed]

I'm trying to find a small supercap for an energy harvesting application, but I can't seem to find one after hours of googling. Loads of pdfs say "Capacitance, 1mF to 100F" or something, but I can ...
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1answer
226 views

RF energy harvesting using UHF and HF from tv, radio and cell towers [duplicate]

I am busy with a project where I want to harvest energy from UHF and VHF such as tv broadcasts, radio and cell phone towers to charge a 100uf capacitor to be able to power a low power appliance such ...
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2answers
344 views

Maximum power out of thermoelectric generator?

The conventional method to extract maximum amount of energy from ThermoElectric Generator (TEG) is to load it with a resistance equal to the TEG's internal resistance as the maximum power transfer ...
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1answer
4k views

DC generator without permanent magnets

I have heard that there are DC generators where resistance can be regulated by using electro-magnetic field. Where permanent magnets are substituted with electro-magnets. Are this kind of generator ...
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4k views

LED as power generator

As many of you probably know, a normal light emitting diode, while very handy as a cheap and ubiquitous indicator, can double as a power generator. The mechanism is the same that is exploited in ...
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1answer
152 views

thermoelectric generator

My question is can a thermoelectric generator(input:heat difference to output:electricity) module also work as a peltier module(Input: current to output:cooling effect)? If I buy a thermoelectric ...
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1answer
95 views

Energy Harvesting, Equivalent Capacitance of Battery Formula

So I was reading through TI's datasheet for their BQ25505 here, and came across the following: 8.1.2 Storage Element Selection In order for the charge management circuitry to protect the ...
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1answer
133 views

Electromagnetic energy harvesting designing problems

We designed a very simple energy harvester made of a little magnet that moves inside a coil. We have a vibrating environment moving at 12 Hz with 10 millimeters peak-to-peak. Our pcb will be ...
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2answers
648 views

Energy harvesting from a current transformer [closed]

Looking into developing a mobile GSM/3G/SMS current monitoring widget which measures and powers the circuitry from a current transformer(s). One of the major hurdles is gathering enough power to ...
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1answer
352 views

Harvesting Energy from an Electromagnetic Generator

I have designed a simple circuit that harvests energy that is generated from an electromagnetic generator. I would like to know tips I could use to improve efficiency and minimize the losses I may ...
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1answer
148 views

How to design batteryless circuits with power harvesting

I'm designing a PCB with - Micro-controller - Accelerometer - WiFi/Bluetooth - NFC Is it possible to run this board without any external batteries. I was looking at power harvesting modules, ...
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1answer
167 views

How much energy can a RF harvester capture from a mobile phone

Hi Guys, I've wondered if mobile phones were able to transmit energy to RF harvesters. Is there a way to calculate how much energy can be harvested from a standard smart phone today when placed at a ...
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1answer
216 views

Electrical eel electricity harvesting

I am watching this video over and over again and I can't visualize the current flow from the eel, to the two metal plates, to the Christmas tree. Is there a voltage difference between the two plates, ...
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3answers
468 views

Piezoelectric vibration energy harvesting

Recently I'm working on a project aiming to convert the vibration of sound waves into electricity to charge batteries using a piezoelectric material (MFC type). I was trying to use the human voice as ...
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1answer
446 views

How does this step up oscillator actually work?

I watched a Dave jones video on an energy harvester but I'm trying to figure out how the front end of this circuit actually resonates and how that steps up some small input voltage. Is it a function ...
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2answers
3k views

Which of the following motors best suit as a wind generator? [closed]

I'm watching some brushless outrunners with low kv as a generator for a simple wind turbine that I'm going to build soon. It might not be a scale or fully useful turbine, because I want to build it ...
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3k views

RF Energy Harvesting

Why can energy invested in RF radiation not be harvested fully? What are the main factors that affect this? Is there any significant research nowadays that fully describes this process? I stand on the ...
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2answers
1k views

Convert high voltage AC (10kV, 60Hz) to low voltage DC (5V)

Is there any easy and safe way to convert the high voltage AC (60Hz, 10kV, such as the voltage on the overhead line) to 5V DC that can be used to power up a micro controller (around 1W power)? We do ...
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242 views

How to add two or more harvested voltages

We are harvesting power from a variety of sources. Each harvested voltage has its own super capacitor to store. We want all of the super capacitor voltages to contribute to a single Vout, but don't ...
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How do the cassette tape adapters get their energy

I was wondering where the cassette tape adaptors get their energy, looking at this image http://car-mods.wonderhowto.com/how-to/hack-your-cars-cassette-deck-into-wireless-bluetooth-music-player-...
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Energy harvesting from AC wire

I'm designing a home automation module and finding a way to supply power. Is it possible to harvest energy from existing AC wire using step-up current transformer? Also I can only find step-down ...
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2answers
1k views

Harvesting Back EMF Possible?

Let me start by saying that I am not talking about the free energy or "overunity" idea of back EMF. When searching around for information I can only seem to find information from free energy sites, ...
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Solar panel calculation

I have a small solar panel of the following, Area = 0.0078 square meter Rated Power = 1 W Now, I am interested to calculated the total energy this solar panel can harvest over a day. I am taking ...
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218 views

Why harvesting energy why not harvesting power?

I am wondering why is it called Harvesting energy and why not harvesting power? Energy is measured in Joules/s and power is Watt but the result is watt. For example if we harvest energy from sun or ...
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669 views

Energy harvesting to power Xbee

I'm planning on a little experiment with a friend. We're gonna be using 2 Xbee series 1 modules at 3.3V and 50mA. One of the Xbee modules will be sealed in a music instrument and I was wondering: is ...
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964 views

Powercast Powerharvester Chipset PCC110 Issues

I recently picked up a PCC110 datasheet, an RF energy harvester. I assumed the 3 pins would correspond to GND, Antenna, and Vout (the datasheet does not specify). I attempted all of the permutations ...
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2k views

Energy harvesting circuit modification

I'm currently doing a project on micro-power harvesting and I wanted to make some practical application but need to modify a circuit I've found. I'm not really sure about all the calculations, so I'd ...
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1answer
75 views

Best battery configuration

With this typical connection, lighting lasts for about 19h. With this arrangement lasts more? All batteries are rechargeable Ni-Cd
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772 views

Energy harvesting - drain capacitor when voltage is reached, ultra low power

I want to connect tiny solar cell to a capacitor, let it charge it and once voltage reaches 2V - flush it through tiny red LED. Could anyone suggest how to implement that given that charge current ...
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Creating power from shaft rotation

I am a mechanical engineer and am working on a project. This project consists of a rotating shaft and I would like to generate power from that rotating shaft.The shaft will not be rotating ...
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2k views

Harvesting energy from old batteries?

Old batteries (I mean AA, AAA -sized 1.5v ones) usually have some residual energy, which can be used, for example, to charge mobile phones/pads. I have seen some schematics on the Net, but all of them ...