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CBC915-ACA-TR5 Datasheet(PDF) 6 Page - Cymbet Corporation |
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CBC915-ACA-TR5 Datasheet(HTML) 6 Page - Cymbet Corporation |
6 / 16 page CBC915 EnerChip Energy Processor ©2012 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com DS-72-15 Rev F Page 6 of 16 Figure 2. Current-Voltage Profile of a Constant Impedance Transducer Most other energy harvesting transducers (e.g., thermoelectric and piezoelectric generators) have constant output impedance. These constant impedance transducers can be further categorized into subgroups based on impedance and typical output voltage. Most - but not all - thermoelectric generators (TEGs) have low impedances (less than 300Ω) and output voltages that vary linearly with the temperature difference across the generator. The matched impedance output voltage of a TEG used in an energy harvesting application is typically in the low tens of millivolts to around 1V depending on the number of elements in the TEG and temperature difference across the TEG. The CBC915 energy processer is designed to work with TEGs with several hundred ohms of impedance and open circuit output voltages ranging from 500mV to 2V. Extracting maximum efficiency from a TEG requires careful mechanical design which allows good thermal conduction from the hot to cold side of the TEG but at the same time insulates any thermal leakage path around the TEG that can reduce the temperature differential. Piezoelectric generators also have a constant impedance characteristic, in that changes in input excitation cause a fairly linear change in output voltage. Piezoelectric generators typically have output impedances in the 10kΩ to 100kΩ range, with output voltage that changes linearly with input excitation. Most piezoelectric energy harvesters elements resonate at only one particular frequency with a power bandwidth of only a few Hertz (2-3Hz being typical). The CBC915 Energy Processer is designed to work with piezoelectric generators having an output voltage - after rectification and filtering into a matched load - ranging from 4.5V to 20V DC. The current-voltage (I-V) profile depicted in Figure 2 is indicative of a constant impedance transducer. From the I-V curve, it is evident that operation at a point away from the peak power point results in a significant reduction of power available from the transducer and therefore to the load. Consequently, to transfer a useful amount of power to the load when input power is scarce, it is imperative to match the impedance of the transducer; moreover efficient power conversion using impedance matching must be done dynamically, as the transducer I-V profile will often vary in accordance with fluctuations in ambient conditions. 0 10 20 30 40 50 60 70 80 90 100 0 250 500 750 1000 1250 1500 1750 2000 2250 2500 0 10 20 30 40 50 60 70 80 90 100 Current as a percentage of short circuit current Normalized Power From a Constant Impedance Transducer Power Volts |
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