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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Piezoelectric Harvester Circuitry

Can anyone tell me what type of circuit is used in this piezoelectric harvester? And if possible, could you also provide a diagram of it when connected to battery?
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Sorting very different voltages and use them to charge batteries

I'm working on a project to produce electricity from a source that can produce sometimes negative, sometimes positive voltages, ranging from mV to kV depending on the situation, with very little ...
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Convert kWh during a 1 hour period to average 15 min kW output

If I have a photovoltaic system that outputs 100 kWh from 1PM - 2PM on a given day and I am trying to figure out what the average 15 minute kW would be during that time period, would that be equal to ...
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Show polarity of magnetic pulse using two LEDs

I have made this simple circuit: In response to a rapidly changing magnetic field (pulse), the LED blinks. An example of the pulse is shown below: Now I would like to have a circuit with 2 LEDs so ...
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Ideal diode for 0-5V range for measurement circuit

I am building a measurement circuit that measures the voltage/current from a thermogenerator. The expected measurement range (and therefore input voltage range) is 0-5V. I plan to measure it with a ...
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Efficiency of a solar cell

I am from Colombia where recently was opened a solar park with a power of 61 MW link to news I consulted the Solar radiation in the area and has a value of 5 kWh/m², the solar cell efficiency is 20%, ...
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Can you charge a LI-PO battery using negative voltage?

I have to charge a LI-PO Battery (11.1V 1800MAh LB-12 19.98Wh 5C) using an P2110B (RF Harvester). The battery charger (YT-0003S) supplies 12.6V @ 1.1A. The P2110B supplies only up to 5.5V at 50mA. Now,...
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Harvest AC current by connecting to ground?

The other day I was curious and I tried the following: Set multimeter to AC Hold one lead in one hand Plug the other lead into ground plug of a house socket Multimeter shows ~2V Does that mean that ...
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How to use a battery charger evaluation module as a booster?

I have a power source that can give me around 0.9 ~ 1 V and 900uA. I would like to use the BQ25570 battery charger evaluation module to give an output of 1.8 V. I would like to attach a capacitor to ...
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How to calculate energy added to grid using active and reactive power?

I have recently installed solar system that adds energy to the grid. My utility company has installed bi-directional meter at my place to record energy consumed as well as energy added to the grid. ...
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Measuring AC power output from harvester

In order to characterise an energy harvester, I want to measure its power output. It is a rotary harvester (basically like a regular generator) with three phases. I do not have fancy measuring ...
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A piezoelectric battery

This question is of a purely theorethical nature. Applying pressure to a piezoelectric material creates voltage, and the inverse is also true. I have seen this likened to a spring, and was wondering ...
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Impedance Matching using Transmission line

Hi! I was looking at this research paper for Energy Harvesting through Rectanna and I stuck with this thing. The author, first, calculated the Rzin of the rectifier circuit. He had a source resistance ...
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Is it possible to generate RF to then harvest instead of just using background RF?

I know you can harvest background RF using energy harvesting techniques but this only generates a small amount of power. Could you put a RF emitter close to an energy harvesting product to get more ...
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Can electronic devices be installed on the pillar of UHV towers such as 345kV?

Can electronic devices be installed on the pillar of UHV towers such as 345 kV? Because I have an idea to install a remote automatic control electronic device on the tower to control the rotation and ...
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What is this symbol called? A blue rectangle with a red dot

This is a rectifier circuit in RF Energy Harvesting. I have no idea what does the blue rectangle symbol called. (Found in https://pdfs.semanticscholar.org/d6fe/47f5539a231dfeeef67166977893070788f2.pdf)...
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Current transformer energy harvesting from a mid-voltage line

I'm planning on harvesting energy from a 33kV line which has an average 10rms A current. The main conductor (N1) has a overall diameter of about 13mm.In the beginning I tried to harvest around 3-4 W ...
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SSHI circuit on LTSpice

I've been trying to get an SSHI circuit running on LTspice for several days now (see below schematic). My problem is the following: the simulation (.tran) stops after a hundred milliseconds. Being a ...
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Can we harvest energy from a Rogowski coil?

Can we harvest enough energy (4-5 watts of power) from a custom made Rogowski coil? The primary conductor is 33kV and has an average current of 10A. I'm aware of the induced voltage and the mutual ...
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Can I charge a 16V 16.6F supercapacitor with an 18V solar panel?

I'm working on my calculus project (I recently started college) and my topic is using solar panels and supercapacitors to help mitigate the lack of energy/electricity in the rural areas in my region. ...
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Enhancement and MPP of a basic Al-air battery with saline electrolyte

I created a simple Al-air battery in oceans using Aluminum and graphite electrodes with ocean water as the electrolyte. There is no electrical separation between the electrodes due to design ...
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How does a relay or switch work with batteries or capacitors?

I am charging my capacitor so it can act as a battery for a short period of time. I already did the calculations for the battery discharging and charging. My problem is now that I have a load, I want ...
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Energy Harvesting application capacitor selection

I have an energy harvesting application and I want to use a capacitor to store energy. Due to the application being very low power, a capacitor of around 50uF might be enough. What is really important ...
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Very low voltage BJT behaivor

I'm interested in very low supply voltage boosting. 20-200mV, the lower the better. Usually such applications use zero threshold MOSFETs, but I'm curious if BJT will do the work too. In the datasheet,...
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Capacitor's energy required for a predetermined drop in its voltage - with LDO and constant current elements as load

I am trying to understand how much energy a circuit (composed by some passives here called analog, and an MCU) will require. The system is powered through a capacitor, and the "passives" are actually ...
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Unpredicted behavior in an energy harvester circuit using max666

I conducted the simulation of a circuit used for energy harvesting. Its functioning is explained in detail in How the voltage stable mechanism work in Bridge rectifier?. But it was observed in the ...
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Simulation issue when using LT3012B

For an energy havesting application I needed a power management circuit so that it can power a wireless sensor module. The sensor module requires roughly 25mA current in active mode and 100uA in sleep ...
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What should I do to control the impedance in piezoelectric energy harvester

I am trying to design an piezoelectric energy harvester circuit and using voltage multiplier rectifier to build it now. I am using a piezo film, LDT4-028k as a source and it has 11nF cap inside the ...
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Low voltage MPPT boost converter IC, constant input voltage

Following scenario: I have a bunch of Sunpower C50 unprocessed single solar cells. I'm trying to make a panel out of them for hiking. According to the datasheet each cell has 0.574 Vmpp an 5.65 Impp ...
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Schottky diodes in series to reduce maximum voltage at supercapacitor solar charging circuit

I use the following circuit to store solar energy harvested by photodiodes into a supercapacitor. The cap is rated at maximum 2.8V. The zener diode is rated at 3V, but depending on the harvested solar ...
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Micropower voltage regulator with discrete components

Overview I have an unregulated power source (photodiodes BPW34) from which I want to get a regulated voltage output 1V. My load consumes less than 10 microamps of current at 1 V. Constraints: I'm ...
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Overvoltage protection Piezo Harvester

I have a piezo harvester, capable of creating spikes of 50+Volts. My harvesting circuit which will be connected to the harvester output, has a maximum rating of 20Volts. Therefore I need some kind of ...
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BQ25570 Ground Layout

I am using the BQ25570 power management IC for energy harvesting from a solar panel. I am currently designing the PCB layout for the IC, and I am a bit confused about the ground. As you can see in ...
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Can an LED run by harvesting energy from mains hum? [closed]

One morning 2 weeks ago I found a green LED in a carpark attached to a deflated ballon. It had obviously landed overnight. I left it there and when I returned in the evening it was still glowing quite ...
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Can I charge a lipo battery using piezoeletric energy harvesting?

I use a 9V 800mAh lipo Okcell battery to power my ESP8266 ESP-01 with a voltage regulator to change it to 3.3V. I use the ESP to detect the voltage peak from a piezoelectric when someone is running to ...
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Which type of RF harvested device is used now?

I want to do some research about energy harvesting optimization, and I want to ask which type of RF energy harvested device is used now? first,one transmitter will transmit one signal to the energy ...
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Simulation of the Micro-kinetic generator

I am simulating the block diagram of the Autoquartz system during unwinding in Simulink. I want to get the current of microgenerator (Ibus), but I get an oscillating pattern, which you can see here ....
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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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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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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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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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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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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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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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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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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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"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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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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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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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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