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Energy Harvesting Circuits


Energy Harvesting:   #'s - L        M - Z
 

Last Updated: October 25, 2017 06:47 AM

Circuits Designed by Dave Johnson, P.E. :

1W Solar Path Light with COB  -  Chip on board (COB) LEDs are all the rage.  These devices assemble multiple tiny LED chips onto a metal backed circuit board, then cover the assembly with a plastic cover.  The metal back allows the assembly to be mounted to heat sink to keep the device cool.  The multiple LED chips can be wired into any number of series/parallel configurations.  Some are wired for 12v operation while other COB LEDs in flashlights are all wired in parallel, with an operating voltage of about 3 volts. . . . Circuit by David Johnson P.E.-May 23, 2017

4_D-Cell_LED_Lantern_Modified  -  While shopping at a sporting goods store one day, I spotted a compact LED lantern.  It looked like the kind of lantern I could modify. The lantern LEDs were grouped into three sections of 7 LEDs each, oriented into 120 degree angles.  The LEDs were standard T 1-3/4 epoxy types.  The lantern had a three mode switch which selected between off, full power and half power modes.  At the half power mode, only half of the 21 LEDs were illuminated.  At full power all LEDs were illuminated. . . . Hobby Circuit by David Johnson P.E.-September 21, 2017

8 Solar Cell LED Light  -  I have been modifying a lot of solar garden and path lights for the last several years.  I buy some units from home improvement stores, then I gut them completely.  I take out the battery, electronic control board, LED and solar panel.  I then replace those components with new units.  I increase the size of the solar panel and battery.  I use a more efficient and brighter LED . . . Circuit by David Johnson P.E.-September 22, 2017

Colman_Lantern3_Modified  -  While shopping at a sporting goods store one day, I spotted a compact LED lantern.  It looked like the kind of lantern I could modify. The lantern LEDs were grouped into three sections of 7 LEDs each, oriented into 120 degree angles.  The LEDs were standard T 1-3/4 epoxy types.  The lantern had a three mode switch which selected between off, full power and half power modes.  At the half power mode, only half of the 21 LEDs were illuminated.  At full power all LEDs were illuminated. . . . Hobby Circuit by David Johnson P.E.-September 21, 2017

Fireflies_In_Jar_Solar_Light  -  When I was a kid, growing up in Illinois, I remember catching fireflies and putting them into a jar.  I loved watching them flashing away at night.  Later, I would let them out to live another day. . . . Hobby Circuit by David Johnson P.E.-September 21, 2017

Flasher_&_Beeper_for_Well_Pump  -  Several years ago I installed a box on my water well pump head.  At the well head, the solar powered box flashed a very bright LED light and chirped a very load siren, whenever the pump motor was in operation.  After many years of service, the box finally became corroded from rain water and died.  So, I thought it was time to redesign the circuit and build up a replacement. . . . Hobby Circuit by David Johnson P.E.-June 29, 2017

Insolution_Meter_Solar  -  You donít need a fancy and expensive meter to measure the sunís intensity.  With some inexpensive parts you can build your own meter.  I used a 1ma meter movement and a single solar cell I got on eBay with an area of about one square inch.  I calibrated the meter on a very clear bright summer day when the sun was directly overhead. . . . Hobby Circuit by David Johnson P.E.-July 14, 2017

LED_Light_8_Solar_Cell  -  I have been modifying a lot of solar garden and path lights for the last several years.  I buy some units from home improvement stores, then I gut them completely.  I take out the battery, electronic control board, LED and solar panel.  I then replace those components with new units.  I increase the size of the solar panel and battery.  I use a more efficient and brighter LED . . . Hobby Circuit by David Johnson P.E.-September 22, 2017

LED_Light_for_Tool_Shed  -  I have a lean-to 8ft by 12ft shed next to my house.  It is full of lawn chemicals and garden supplies.  There were times when I needed to get something from inside the shed during the dead of night.  Early on I had to use a flashlight.  But later, I installed a series of five 12v LED light strips on the ceiling.  Each strip contained 15 3v white LEDs.  The strip had 5 strings of three LEDs, wired in series, with a 150 ohm current limiting resistor. . . . Hobby Circuit by David Johnson P.E.-July 14, 2017

Light_Pathway_1w_Solar_Cob_LED  -  Chip on board (COB) LEDs are all the rage.  These devices assemble multiple tiny LED chips onto a metal backed circuit board, then cover the assembly with a plastic cover.  The metal back allows the assembly to be mounted to heat sink to keep the device cool.  The multiple LED chips can be wired into any number of series/parallel configurations.  Some are wired for 12v operation while other COB LEDs in flashlights are all wired in parallel, with an operating voltage of about 3 volts. . . . Hobby Circuit by David Johnson P.E.-May 23, 2017

Lighthouse_Solar_Powered  -  While at a discount store one day, I spotted an interesting tall lighthouse.  It had a tiny solar panel and an equally tiny LED light.  The LED was pointing downward, at the center of a rotating light reflector.  I thought it might be turned into an interesting addition to my wifeís garden. . . . Hobby Circuit by David Johnson P.E.-September 21, 2017

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

14 Volt Toilet Tank Refiller  -  A flushing toilet is something that most city dwellers take for granted, but it can be a luxury for those who live away from utility water and electricity.  This circuit provides on-off pump switching for a small 12 Volt pump that is used to fill a toilet tank from an external rain water collection cistern.  The 12 Volt power comes from a small solar power system.  The cistern is located at ground level, so the pump is required to move the water up to the toilet tank __ Designed by Nicola Asuni

1A Solar Panel Powered 3-Stage 12V Lead-Acid Charger  -  1A Solar Panel Powered 3-Stage 12V Lead-Acid Fast/Float Charger; 1A Charger Fast Charges with CC/CV characteristics Up to 14.4V; When Charge Current Falls to 0.1A Charger Switches to 13.5V Float Charge Mode; Charger Re-initiates 14.4V Fast Charge Mode if Battery Voltage Falls Below 13.2V and Trickle Charges at 0.15A if Battery __ Designed by Linear Technology/Analog Devices App Note, Jun 15th 2010

1W Solar Path Light with COB  -  Chip on board (COB) LEDs are all the rage.  These devices assemble multiple tiny LED chips onto a metal backed circuit board, then cover the assembly with a plastic cover.  The metal back allows the assembly to be mounted to heat sink to keep the device cool.  The multiple LED chips can be wired into any number of series/parallel configurations.  Some are wired for 12v operation while other COB LEDs in flashlights are all wired in parallel, with an operating voltage of about 3 volts. . . . Circuit by David Johnson P.E.-May 23, 2017

2.2V/3.3V/3.3V Peltier-Powered (TEG) Energy Harvester for Wireless Remote Sensor Application  -  The LTC3108 is a highly integrated DC/DC converter ideal for harvesting and managing surplus energy from extremely low input voltage sources such as TEGs (thermoelectric generators) , thermopiles and small solar cells.  The step-up topology operates from input voltages as low as 20mV.  __ Linear Technology/Analog Devices App Note, Mar 23, 2010

2.35V/2.2V Peltier-Powered (TEG) Energy Harvester for Remote Sensor Application  -  The LTC3108 is a highly integrated DC/DC converter ideal for harvesting and managing surplus energy from extremely low input voltage sources such as TEGs (thermoelectric generators) , thermopiles and small solar cells.  The step-up topology operates from input voltages as low as 20mV.  __ Linear Technology/Analog Devices App Note, Mar 23, 2010

2A Solar Panel Power Manager with 7.2V LiFePO4 Battery & 17V Peak Power Tracking  -  The LT3652 is a complete monolithic step-down battery charger that operates over a 4.95V to 32V input voltage range.  The LT3652 provides a constant-current/ constant-voltage charge characteristic, with maximum charge current externally programmable up to 2A.  The charger employs a 3.3 V fl oat voltage feedback reference, so any__ Linear Technology/Analog Devices App Note, Jun 15th 2010

2-Cell Solar Panel Li-Ion Battery Charger  -  This circuit shows a compact solar-powered battery charger using a LTC3105 as a boost converter and a LTC4071 as Li-ion shunt charger.  A 2-cell 400mW solar panel provides the input power to the LTC3105 to produce over 60mA of charge current in full sunlight.  Maximum power point control prevents the solar panel voltage from__ Linear Technology/Analog Devices App Note, Jul 1, 2011

3.3V Fluorescent (Electric Field) Energy Harvester  -  The LTC3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized for high output impedance energy sources such as piezoelectric transducers.  __ Linear Technology/Analog Devices App Note, Mar 23, 2010

3.3V from Multiple Stacked-Cell Photovoltaic with Source Temperature Tracking  -  The LTC3105 is a high efficiency step-up DC/DC converter that can operate from input voltages as low as 200mV.  A 250mV start-up capability and integrated maximum power point controller (MPPC) enable operation directly from low voltage, high impedance alternative power sources such as photovoltaic cells, TEGs (thermoelectric__ Linear Technology/Analog Devices App Note, Oct 26th 2010

3.3V Piezo Energy Harvester with 9V Battery Backup  -  The LTC3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized for high output impedance energy sources such as piezoelectric transducers.  __ Linear Technology/Analog Devices App Note, Mar 23, 2010

3.3V Piezoelectric Energy Harvester Powering a Microprocessor with a Wireless Transmitter & 50mA Load Step Response  -  The LTC3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized for high output impedance energy sources such as piezoelectric transducers.  __ Linear Technology/Analog Devices App Note, Mar 22, 2010

3.3V Piezoelectric Energy Harvester Powering a Microprocessor with a Wireless Transmitter & 50mA Load Step Response  -  The LTC3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized for high output impedance energy sources such as piezoelectric transducers.  __ Linear Technology/Analog Devices App Note, Mar 22, 2010

4_D-Cell_LED_Lantern_Modified  -  While shopping at a sporting goods store one day, I spotted a compact LED lantern.  It looked like the kind of lantern I could modify. The lantern LEDs were grouped into three sections of 7 LEDs each, oriented into 120 degree angles.  The LEDs were standard T 1-3/4 epoxy types.  The lantern had a three mode switch which selected between off, full power and half power modes.  At the half power mode, only half of the 21 LEDs were illuminated.  At full power all LEDs were illuminated. . . . Hobby Circuit by David Johnson P.E.-September 21, 2017

5.4V to 2.5V Thermoelectric Energy Harvester  -  The LTC3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized for high output impedance energy sources such as piezoelectric transducers.  __ Linear Technology/Analog Devices App Note, Mar 23, 2010

5V to 16V Solar-Powered 2.5V Supply with Supercapacitor for Increased Output Energy Storage & Battery Backup  -  5V to 16V Solar-Powered 2.5V Supply with Supercapacitor for increased Output Energy Storage and Battery Backup__ Linear Technology/Analog Devices App Note, Mar 23, 2010

70W, Solar Energy Harvester with Maximum Power Point Regulation  -  The LT3763 is a fixed frequency, synchronous, step-down DC/DC controller designed to accurately regulate output currents up to 20A.  The average current mode controller will maintain inductor current regulation over a wide output voltage range from 0V to 55V.  Output current is set by analog voltages on the CTRL pins and an external__ Linear Technology/Analog Devices App Note, Oct 10th 2012

8 Solar Cell LED Light  -  I have been modifying a lot of solar garden and path lights for the last several years.  I buy some units from home improvement stores, then I gut them completely.  I take out the battery, electronic control board, LED and solar panel.  I then replace those components with new units.  I increase the size of the solar panel and battery.  I use a more efficient and brighter LED . . . Circuit by David Johnson P.E.-September 22, 2017

AC Line Powered 3.6V Buck Regulator with Large Output Capacitor to Support Heavy Loads   -  The LTC3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized for high output impedance energy sources such as piezoelectric transducers.  __ Linear Technology/Analog Devices App Note, Mar 23, 2010

Colman_Lantern3_Modified  -  While shopping at a sporting goods store one day, I spotted a compact LED lantern.  It looked like the kind of lantern I could modify. The lantern LEDs were grouped into three sections of 7 LEDs each, oriented into 120 degree angles.  The LEDs were standard T 1-3/4 epoxy types.  The lantern had a three mode switch which selected between off, full power and half power modes.  At the half power mode, only half of the 21 LEDs were illuminated.  At full power all LEDs were illuminated. . . . Hobby Circuit by David Johnson P.E.-September 21, 2017

Dual (3.6V/1.8V) Rail Power Supply with Single Piezo & Automatic Supply Sequencing  -  The LTC3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized for high output impedance energy sources such as piezoelectric transducers.  __ Linear Technology/Analog Devices App Note, Mar 23, 2010

Dual TEG Energy Harvester (3.3V/2.2V) Operates from Temperature Differentials of Either Polarity   -  The LTC3108 is a highly integrated DC/DC converter ideal for harvesting and managing surplus energy from extremely low input voltage sources such as TEGs (thermoelectric generators) , thermopiles and small solar cells.  The step-up topology operates from input voltages as low as 20mV.  __ Linear Technology/Analog Devices App Note, Mar 23, 2010

Energy Harvester Operates from Small Temperature Differentials of Either Polarity  -  The LTC3109 is a highly integrated DC/DC converter ideal for harvesting surplus energy from extremely low input voltage sources such as TEGs (thermoelectric generators) and thermopiles.  Its unique, proprietary autopolarity topology allows it to operate from input voltages as low as 30mV, regardless of polarity.  In this circuit, __ Linear Technology/Analog Devices App Note, Jul 8th 2010

Energy Harvesting Converter Operates from a Variety of Weak Sources  -  The LTC3129 is a high efficiency, 200mA buck-boost DC/DC converter with a wide ViN and VOUT range.  It includes an accurate RUN pin threshold to allow predictable regulator turn-on and a maximum power point control (MPPC) capability that ensures maximum power extraction from non-ideal power sources such as photovoltaic panels.  __ Linear Technology/Analog Devices App Note, Feb 15th 2013

Fireflies_In_Jar_Solar_Light  -  When I was a kid, growing up in Illinois, I remember catching fireflies and putting them into a jar.  I loved watching them flashing away at night.  Later, I would let them out to live another day. . . . Hobby Circuit by David Johnson P.E.-September 21, 2017

Flasher_&_Beeper_for_Well_Pump  -  Several years ago I installed a box on my water well pump head.  At the well head, the solar powered box flashed a very bright LED light and chirped a very load siren, whenever the pump motor was in operation.  After many years of service, the box finally became corroded from rain water and died.  So, I thought it was time to redesign the circuit and build up a replacement. . . . Hobby Circuit by David Johnson P.E.-June 29, 2017

Insolution_Meter_Solar  -  You donít need a fancy and expensive meter to measure the sunís intensity.  With some inexpensive parts you can build your own meter.  I used a 1ma meter movement and a single solar cell I got on eBay with an area of about one square inch.  I calibrated the meter on a very clear bright summer day when the sun was directly overhead. . . . Hobby Circuit by David Johnson P.E.-July 14, 2017

LED_Light_8_Solar_Cell  -  I have been modifying a lot of solar garden and path lights for the last several years.  I buy some units from home improvement stores, then I gut them completely.  I take out the battery, electronic control board, LED and solar panel.  I then replace those components with new units.  I increase the size of the solar panel and battery.  I use a more efficient and brighter LED . . . Hobby Circuit by David Johnson P.E.-September 22, 2017

LED_Light_for_Tool_Shed  -  I have a lean-to 8ft by 12ft shed next to my house.  It is full of lawn chemicals and garden supplies.  There were times when I needed to get something from inside the shed during the dead of night.  Early on I had to use a flashlight.  But later, I installed a series of five 12v LED light strips on the ceiling.  Each strip contained 15 3v white LEDs.  The strip had 5 strings of three LEDs, wired in series, with a 150 ohm current limiting resistor. . . . Hobby Circuit by David Johnson P.E.-July 14, 2017

Light_Pathway_1w_Solar_Cob_LED  -  Chip on board (COB) LEDs are all the rage.  These devices assemble multiple tiny LED chips onto a metal backed circuit board, then cover the assembly with a plastic cover.  The metal back allows the assembly to be mounted to heat sink to keep the device cool.  The multiple LED chips can be wired into any number of series/parallel configurations.  Some are wired for 12v operation while other COB LEDs in flashlights are all wired in parallel, with an operating voltage of about 3 volts. . . . Hobby Circuit by David Johnson P.E.-May 23, 2017

Lighthouse_Solar_Powered  -  While at a discount store one day, I spotted an interesting tall lighthouse.  It had a tiny solar panel and an equally tiny LED light.  The LED was pointing downward, at the center of a rotating light reflector.  I thought it might be turned into an interesting addition to my wifeís garden. . . . Hobby Circuit by David Johnson P.E.-September 21, 2017

Li-Ion Battery Charger & 2.2V LDO Powered by a Solar Cell with Indoor Lighting  -  The LTC3108 is a highly integrated DC/DC converter ideal for harvesting and managing surplus energy from extremely low input voltage sources such as TEGs (thermoelectric generators) , thermopiles and small solar cells.  The step-up topology operates from input voltages as low as 20mV.  __ Linear Technology/Analog Devices App Note, Mar 23, 2010


Energy Harvesting Circuits:   #'s - L        M - Z

 


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