energy harvesting multi-source demoboard with transducers (dc2080a) brian shaffer applications...

ENERGY HARVESTINGMULTI-SOURCE DEMOBOARD WITH TRANSDUCERS (DC2080A)

Brian ShafferApplications ManagerBoston Design CenterLinear Technology Corporationemail: [email protected], Phone: 978-656-3755

© 2013 Linear Technology

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Outline• What is the DC2080A, Energy Harvesting (EH) Multi-Source Demoboard • Available Power from Typical Energy Harvesting

Sources

• Energy Harvesting Power Management Circuits

• LTC3588-1: Piezoelectric Energy Harvesting Power Supply.• LTC3108: Ultralow Voltage Step-Up Converter and Power Manager.• LTC3105: Step-Up DC/DC Converter with Power Point Control and LDO

Regulator.• LTC3459: 10V Micropower Synchronous Boost Converter with Input Voltage

Regulation.• LTC2935-2,-4: Ultralow Power Supervisor with Power-Fail Output Selectable

Thresholds.

• Schematic and BOM for Reference

• Conclusion


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What is the DC2080A

Power Management

Board

for the

ENERGY HARVESTING

“TO GO”

DESIGN KIT


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What is the DC2080A

Top Assembly

• Energy Harvesting Multi-Source Demoboard with Transducers

• Allowable Sources

• PIEZOELECTRIC TRANSDUCER

• ELECTROMECHANICAL TRANSDUCER

• THERMAL ELECTRIC GENERATOR

• 4-20mA LOOP

• PHOTOVOLTAIC CELLS

• VIN Range• 20mV @ 3.5 Ohms - 200V @ 40K

Ohms• VOUT Average

• 3.3V @ <50mA, Typically 20uA to 1mA


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What is the DC2080A• Energy Harvesting Multi-

Source Demoboard with Transducers

• Allowable Sources

• PIEZOELECTRIC TRANSDUCER

• ELECTROMECHANICAL TRANSDUCER

• THERMAL ELECTRIC GENERATOR

• 4-20mA LOOP

• PHOTOVOLTAIC CELLS

• VIN Range• 20mV @ 3.5 Ohms - 200V @ 40K

Ohms• VOUT Average

• 3.3V @ <50mA, Typically 20uA to 1mA

Bottom Assembly


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Available Sources• How Much Power is Available?


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LTC3588-1: Piezoelectric Energy Harvesting Power Supply (VIBRATION or High-impedance AC-sources)

•Key Features:o Integrated rectifier converts piezo AC

output to DC ( extremely low leakage )o 500nA UVLO circuit allows input cap to

be charged up before DC/DC enabled – ensures reliable startup

o Synchronous step-down DC/DC operates over wide VIN and load current with high efficiency

o Overvoltage shunt protects input – dumps excess energy to GND at VIN > 20V

o 1uA (typ) no load ICC minimizes wasted energy at low vibration levels


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LTC3108: TEG POWERED ENERGY HARVESTER

• Operates from inputs as low as 20mV• Alternate Fixed Output Voltages• Unique Resonant Power converter / Energy Harvester• Auxiliary LDO• Manages Energy storage between Reservoir and Main Cout or Batt• Compact Step-up Transformer• 3x4mm DFN or GN16 packages

LTC3108 Voltage Sequencing (Measurements)

9© 2011, Linear Technology Corporation

VLDO

VOUT

VSTORE

VIN

Power Up Power Down

o VLDO: 2.2V fixed

o VOUT: 2.35V, 3.3V, 4.1V or 5V

(LTC3108 & LTC3109)

o VOUT: 2.5V, 3.0V, 3.7V, 4.5V

(LTC3108-1)

o VSTORE charges up to 5.25V


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LTC3105: SUPPLIED BY DIODE VOLTAGE DROP IN 4-20MA

LOOP

o Synchronous Boost Converter + LDO starts up at 250mVo Includes Maximum Power Point Control (MPPC), which

adjusts the peak inductor current to maintain Vin at a programmed voltageo Operates from higher resistance sources than traditional boostso Uses burst-mode architecture with variable Ipk and Ivalley


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LTC3459 SUPPLIED BY SOLAR CELL

• >85% Efficiency over Wide Load Range• Internal Synchronous Rectifier• VIN Range: 1.72V to 3.3V• Burst Mode Operation• Inrush Current Limiting• Output Disconnect in Shutdown• Ultralow Quiescent (10μA) and Shutdown (<1μA)

Current


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Detailed Schematic of PGOOD_LTC3459 Circuit using LTC2935-2

• 500nA Quiescent Current• ±1.5% (Max) Accuracy over

Temperature• Integrated Precision Attenuators• Eight Pin-Selectable Reset

Thresholds• Eight Pin-Selectable Power-Fail

Thresholds


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DC2080A Schematic

Optional:PGOOD

Pulse Circuit

Optional:PGOOD

Pulse Circuit

Optional:Energy Storage

Vibration or

High-ImpedanceAC

Thermal Electric

Generator(Rs=3.5Ohms)

4-20mA Loop

(Lower-Voltage Solar)

Lower-Voltage Solar

VSUPPLYON @ 3.15Volts

OFF @ 2.25 Volts


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Linear TechnologyEnergy Harvesting Products – Power

Capability Maximum Output Power*VIN Range LTC3588-1

Iq = 950nALTC3588-2Iq = 1.5uA

LTC3108Iq=6uA

LTC3109Iq = 6uA

LTC3105Iq =24uA

LTC3388-XIq = 720nA

LTC4071Iq = 550nA

UVLO_Rising<VIN<=18V

0.36W (3.6V*100mA)

0.5W (5.0V*100mA)

Vin>18V 90mW (18V*5mA)

90mW(18V*5mA)

2.7V<VIN<=20V0.25W(5V@50mA)

VIN=0.6V10mW (2.8mA*3.3V)

15mW ([email protected])

Vcc<=Vshunt 50mA@Vshunt

Vin=3V500mW (Vout=5V)

Vin=1V290mW(Vout=5V)

*Provided the source is capable of delivering the required power to overcome the inefficiency of the power

converter


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LTC Energy Harvesting Solutions

Energy source Transducers LTC Power

Management ICs

Typical POUT @ VOUT = 3.3V

Maximum POUT

@ VOUT = 3.3V

Indoor Solar(200lux – 1000lux)

Photovoltaic Cells (100cm2)

LTC3105LTC4071 LTC3129LTC3459

100uW – 1mW >100mW

Outdoor Solar(1000lux – 50000lux)

Photovoltaic Cells (100cm2)

LTC3105LTC3588LTC3129 1mW – 100mW >100mW

Thermal(10oC – 30oC dT)

TEGs (100cm3)

LTC3108LTC3109

200uW – 1.4mW >10mW

Vibration(Piezo: 0.1g – 1g)

(EM: 0.025g – 0.5g)

Piezoelectric (30cm2)Electromechanical

(200cm3)

LTC3588LTC3129LTC3459

50uW – 500uW500uW – 10mW >100mW


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Conclusion

Thank You

• The DC2080A Multi-Source Demoboard contains power management circuits and support circuitry to condition:• Piezoelectric• Electromechanical • High impedance AC mains• Thermal Electric Generators• 4-20mA loop power• Photovoltaic cells

• If the Integrated Transducers are not needed consider the DC2042A

energy harvesting multi-source demoboard with transducers (dc2080a) brian shaffer applications...

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