DC/DC Converter with Transparent Electronics for application on Photovoltaic Panels Romano Torres 19th July 2013 1 ervisor: Vitor Grade Tavares ond Supervisor: Pedro Miguel Cândido Barquinha ond Supervisor: Pydi Ganga Bahubalindruni Master of Electrical and Computers Engineering
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DC/DC Converter with Transparent Electronics for application on Photovoltaic Panels
Master of Electrical and Computers Engineering. DC/DC Converter with Transparent Electronics for application on Photovoltaic Panels. Romano Torres 19th July 2013. Supervisor: Vitor Grade Tavares Second Supervisor: Pedro Miguel Cândido Barquinha - PowerPoint PPT Presentation
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DC/DC Converter with Transparent Electronics for application on Photovoltaic Panels
Romano Torres19th July 2013 1
Supervisor: Vitor Grade TavaresSecond Supervisor: Pedro Miguel Cândido BarquinhaSecond Supervisor: Pydi Ganga Bahubalindruni
• To construct circuits on flexible substracts, such as plastic, glass:– Possible to embody in photovoltaic panels.
• Low cost fabrication at room temperature.
3
Objectives
• Design of a boost DC/DC converter using transparent electronics in order to have an increased and stable voltage level with direct current.– Vout > 1.5*Vin;– Efficiency >= 40%
• Fabrication of the circuit in CENIMAT/UNL.
4
a-IGZO TFTs
• High parasitic resistance;
• P-type transistors with low performance;
• Threshold voltage shift.
5Staggered bottom-gate TFT structure
Problems:
Voltage Boosting Stage – DC/DC converter
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• Indutors are avoided due to their low performance in transparent technology;
• Capacitor is used to save charge in electric field;
• Vdd < Vout < 2*Vdd
Voltage Boosting Stage - out of phase clock signals
7Lower variation of Vout level.
2 Voltage Boosting Stages in Cascade
8
• To increase the voltage level twice;
• Parasitic effects reduce the efficiency;
• 4 TFTs of 320 μm in parallel for each diode-connection are used;
• Vdd < Vout << 3*Vdd
Separation between Boosting Stages
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• Allow a stable voltage level at node E;
• Avoid clock feedthrough in TFT1 and TFT2.
3 Boosting Stages in Cascade
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• Proposed DC/DC converter includes 3 Voltage Boosting Stages;
• Settling time is increased.
Bootstrapping Stage – Proposed DC/DC converter
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• Bootstrapping stage is used to reduce the settling time of the circuit;
• Power consumption is negligble;
• Small capacitors and transistors can be used.
Comparison with previous DC/DC converters in the same technology
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DC/DC converter from other authors Proposed DC/DC converter
DC/DC Converter - Simulation
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Output voltage
With Load
I_load = 162 μAVout=16.37 V
Without Load
Vout=35.5 V
Bootstrapping
Cross-connected
Efficiency
• The supplied current of each voltage source is measured (I_in=167 μA);
• The currents multiplied by the supplied voltage (Vin=10V) are added, resulting in the input power;
• With the same current for each voltage source, efficiency is:
• The current supplied in bootstrapping stage is very low (I_bs=0.12μA);
• The efficiency is: 39.93%
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3 Voltage Boosting Stages - Simulation
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Voltage levels for each stage
DC/DC converter - Layout
165793.55 μm
3068.55 μm
10 DC/DC converters in parallel
- The equivalent resistance of 10 converters in parallel is lower than with only one converter.