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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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“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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94 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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29 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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40 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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39 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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28 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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43 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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68 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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107 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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70 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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435 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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111 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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323 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
148 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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366 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
249 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
290 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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563 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
75 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
112 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
195 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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259 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
203 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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0answers
45 views

triboelectric nanogenerators

My thesis is "triboelectric nanogenerators". These nanogenerators produce high voltage(e.g. 700V AC) and small current. I want to design an ic power management in cadence virtuso, in 0,35 technology. ...
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1answer
317 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
85 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
197 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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0answers
85 views

Boost 0.8w (5v) solar cell when cloudy

I'm using little solar cell can be delivery 5.5v on open circuit at full sun. But cloudy day the voltage is between about 1v-2.5v, i would like to boost the voltage to about 4.5v-5v to charge lithium ...
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1answer
833 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
77 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
119 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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261 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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47 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
537 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
94 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
156 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
289 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
605 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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167 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
305 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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3answers
564 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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1answer
3k 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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1answer
91 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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2answers
87 views

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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1answer
179 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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1answer
302 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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1answer
212 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
309 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
368 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 ...