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San José State University College of Engineering/Electrical Engineering EE174: Analog Peripheral for Embedded Systems Section 01, Spring 2017 LAB4 Energy Harvesting (EH) Goals: The goal of the experiment is to generate power from a miniature photo cell. Understand basic principle and knowledge of EH photovoltaic transducer. Required Equipment: CPC1822 miniature photo cell Boost converter from Lab 3 Breadboard and Components References: http://www.farnell.com/datasheets/1681419.pdf DS-CPC1822-R03 www.ixysic.com www.spacegrant.hawaii.edu/reports/26_SP12/TMartinez_S12.pdf CPC 1822 Specifications: The CPC1822 is a monolithic photovoltaic string of solar cells with switching circuitry. When operating in sunlight or a bright artificial light environment the optical energy will activate the cell array and generate a voltage at the output. The solar cells are capable of generating a floating source voltage and current sufficient to drive and power CMOS ICs, logic gates and/or provide “trickle charge” for battery applications. CPC 1822 Circuit: To ensure that enough current is available to drive an output (LED), a voltage follower or buffer was included in the circuit setup. The buffer copies the voltage reading from the sensor and forces current to the copied output voltage. To improve noise at the output, a RC low-pass filter is implemented in conjunction with an op-amp, capacitor and resistor. The capacitor would have a fixed capacitance but a trim-pot resistor would be used for variable resistance allowing for tuning the filter. The overall circuit would consist of a buffer and low-pass filter. A schematic of the circuit is shown below. Circuit 1. Another circuit to drive an output load (LED). Circuit 2. Circuit 3. Required Task: 1. Measure the output of the photo cell at no load. Plot the data. Completely Dark In door no light In door with light Bright sun or high density lamp 2. Circuit 1: Verify if single photo cell has sufficient current to power the load. Record the voltage range. 3. Capture the output voltages and record values of resistor and capacitor used in circuit. 4. Circuit 2: Repeat step 2. and 3. 5. Measure voltage across Rb to verify the current. 6. Implement two photo cell in series and in parallel and repeat the results. 7. Circuit 3: Use photo cell to drive the input of the Boost converter Measure output and Duty Cycle for each condition below. Compare measured data to expected data. Plot the data. Measured Vout / Duty Cycle In door no light In door with light Bright sun or high density lamp 8. Conclusions. Expected Vout / Duty Cycle