Transcript Slide 1

ENERGY HARVESTING
MULTI-SOURCE DEMOBOARD
WITH TRANSDUCERS
(DC2080A)
Brian Shaffer
Applications Manager
Boston Design Center
Linear Technology Corporation
email: [email protected], Phone: 978-656-3755
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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
© 2013 Linear Technology
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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
•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
Top Assembly
© 2013 Linear Technology
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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
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Features:
Integrated rectifier converts piezo AC output to
DC ( extremely low leakage )
500nA UVLO circuit allows input cap to be
charged up before DC/DC enabled – ensures
reliable startup
Synchronous step-down DC/DC operates over
wide VIN and load current with high efficiency
Overvoltage shunt protects input – dumps
excess energy to GND at VIN > 20V
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
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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
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LTC3108 Voltage Sequencing (Measurements)
Power Up
Power Down
VIN
o VLDO: 2.2V fixed
VSTORE
o VOUT: 2.35V, 3.3V, 4.1V or 5V
(LTC3108 & LTC3109)
VOUT
o VOUT: 2.5V, 3.0V, 3.7V, 4.5V
(LTC3108-1)
VLDO
o VSTORE charges up to 5.25V
© 2011, Linear Technology Corporation
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LTC3105:
SUPPLIED BY DIODE VOLTAGE DROP IN 4-20MA LOOP
o Synchronous Boost Converter + LDO starts up at 250mV
o Includes Maximum Power Point Control (MPPC), which adjusts
the peak inductor current to maintain Vin at a programmed voltage
o Operates from higher resistance sources than traditional boosts
o 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
© 2013 Linear Technology
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DC2080A Schematic
Vibration
or
High-Impedance
AC
Optional:
Energy Storage
Optional:
PGOOD
Pulse Circuit
Thermal
Electric
Generator
(Rs=3.5Ohms)
4-20mA Loop
(Lower-Voltage
Solar)
Lower-Voltage
Solar
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Optional:
PGOOD
Pulse Circuit
VSUPPLY
ON @ 3.15Volts
OFF @ 2.25 Volts
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Linear Technology
Energy Harvesting Products – Power Capability
Maximum Output Power*
VIN Range
LTC3588-1
Iq = 950nA
LTC3588-2
Iq = 1.5uA
UVLO_Rising<VIN<=18V
0.36W
(3.6V*100mA)
0.5W
(5.0V*100mA)
90mW
(18V*5mA)
90mW
(18V*5mA)
Vin>18V
LTC3108
Iq=6uA
LTC3109
Iq = 6uA
LTC3105
Iq =24uA
10mW
(2.8mA*3.3V)
15mW
([email protected])
Vcc<=Vshunt
50mA@Vshunt
Vin=3V
500mW
(Vout=5V)
Vin=1V
290mW
(Vout=5V)
*Provided the source is capable of delivering the required power
to overcome the inefficiency of the power converter
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LTC4071
Iq = 550nA
0.25W
(5V@50mA)
2.7V<VIN<=20V
VIN=0.6V
LTC3388-X
Iq = 720nA
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LTC Energy Harvesting Solutions
Energy source
Indoor Solar
(200lux – 1000lux)
Outdoor Solar
(1000lux – 50000lux)
Transducers
Photovoltaic Cells (100cm2)
Photovoltaic Cells (100cm2)
LTC Power
Management ICs
LTC3105
LTC4071
LTC3129
LTC3459
LTC3105
LTC3588
LTC3129
Typical POUT
@ VOUT = 3.3V
Maximum POUT
@ VOUT = 3.3V
100uW – 1mW
>100mW
1mW – 100mW
>100mW
200uW – 1.4mW
>10mW
50uW – 500uW
500uW – 10mW
>100mW
LTC3108
LTC3109
Thermal
(10 C – 30oC dT)
TEGs (100cm3)
Vibration
(Piezo: 0.1g – 1g)
(EM: 0.025g – 0.5g)
Piezoelectric (30cm2)
Electromechanical (200cm3)
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LTC3588
LTC3129
LTC3459
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Conclusion
•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
Thank You
© 2013 Linear Technology