|
|
Low Energy Solid-State Converters for Energy Harvesting
Znbill, Laila ; Husák, Miroslav (oponent) ; Salyk, Ota (oponent) ; Boušek, Jaroslav (vedoucí práce)
Dissertation is focused on low energy transducers for Energy Harvesting. The transducers based on single cell configuration were suggested and prepared for photovoltaic generators operating at low level illumination. A simple and reliable thermo-generator was designed and manufactured using inexpensive production processes and available materials. The original production methods used plasma surface activation by dielectric barrier discharge and modified PEDOT deposition methods. Simple and reliable J-FET driven DC to DC convertors were designed for low voltage applications as thermoelectric generators and single cell photovoltaic cells. They operate from the voltage of few tents of mV and the output voltage could be in the level of several volts. The efficiency is close to 50% and material and production costs are significantly lower in comparison with use of common low power integrated circuits for Energy Harvesting. For control circuit were used bipolar junction transistors which in low current operation mode can have the power supply voltage as low as 0,5 V. The possibility of the production of integrated circuits with extremely low power supply voltage was verified. In this case FET operate in Sub-threshold-mode and Bulk-driven-mode.
|
|
|
Low Energy Solid-State Converters for Energy Harvesting
Znbill, Laila ; Husák, Miroslav (oponent) ; Salyk, Ota (oponent) ; Boušek, Jaroslav (vedoucí práce)
Dissertation is focused on low energy transducers for Energy Harvesting. The transducers based on single cell configuration were suggested and prepared for photovoltaic generators operating at low level illumination. A simple and reliable thermo-generator was designed and manufactured using inexpensive production processes and available materials. The original production methods used plasma surface activation by dielectric barrier discharge and modified PEDOT deposition methods. Simple and reliable J-FET driven DC to DC convertors were designed for low voltage applications as thermoelectric generators and single cell photovoltaic cells. They operate from the voltage of few tents of mV and the output voltage could be in the level of several volts. The efficiency is close to 50% and material and production costs are significantly lower in comparison with use of common low power integrated circuits for Energy Harvesting. For control circuit were used bipolar junction transistors which in low current operation mode can have the power supply voltage as low as 0,5 V. The possibility of the production of integrated circuits with extremely low power supply voltage was verified. In this case FET operate in Sub-threshold-mode and Bulk-driven-mode.
|
|
|
Low Energy Thermoelectric Generators
Znbill, Laila
The paper describes the possibilities of energy harvesting using thermoelectric generators. It is shown that organic semiconductors enable a large variability of properties and some of their properties may be better than by inorganic semiconductor materials. Nevertheless they suffer from poor electrical conductivity. Because the voltage of one junction is quite low even in case of large temperature difference thermoelectric generators need integration of large number of individual thermo-junctions. Printing technologies enhance effective production of integrated thermo-generators with individual junctions connected in series.
|
|
|
Photovoltaic Cells In Low-Light Operation
Znbill, Laila
Comparison of the properties of respective technologies shows that for low-light operation there are most advantageous inorganic thin film cells. It is very important to consider the operating conditions and adapt the selection of the photovoltaic cell to these conditions. Because of very small area of the cell needed for the low energy converters the price of the photovoltaic cell is not an important item in the total cost of an Enargy Harvesting converter. Simple and reliable low price JFET driven DC to DC converter was designed for this application.
|
|
|
Low Voltage Converter for Organic Tranducers in Energy Harvesting
Znbill, Laila
The paper describes the possibilities of energy harvesting using organic semiconductors. It is shown that organic semiconductors enable a large variability and some of their properties may be better than by inorganic semiconductor materials. Simple and reliable JFET driven DC to DC converter was designed for low voltage applications as thermoelectric generators and single-cell solar panels. It is able to operate from the voltage of few tenths of Volt and the output voltage could be in the level of several Volts. The efficiency was found close to 50%. Material and production costs are significantly lower than in case of standard low power integrated circuits.
|
host ::
RSS.