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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT1674 датащи(PDF) 13 Page - Linear Technology |
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LT1674 датащи(HTML) 13 Page - Linear Technology |
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13 / 24 page  LTC3109 13 3109fa APPLICATIONS INFORMATION TEG LOAD MATCHING The LTC3109 was designed to present an input resistance (load) in the range of 2Ω to 10Ω, depending on input volt- age, transformer turns ratio and the C1A and C2A capacitor values (as shown in the Typical Performance curves). For a given turns ratio, as the input voltage drops, the input resistance increases. This feature allows the LTC3109 to optimize power transfer from sources with a few Ohms of source resistance, such as a typical TEG. Note that a lower source resistance will always provide more output current capability by providing a higher input voltage under load. UNIPOLAR APPLICATIONS The LTC3109 can also be configured to operate from two independent unipolar voltage sources, such as two TEGs in different locations. In this configuration, energy can be harvested from either or both sources simultaneously. See the Typical Applications for an example. The LTC3109 can also be configured to operate from a single unipolar source, using a single step-up transformer, by ganging its VIN and SW pins together. In this manner, it can extract the most energy from very low resistance sources. See Figure 3 for an example of this configuration, along with the performance curves. PELTIER CELL (TEG) SUPPLIERS Peltier cells are available in a wide range of sizes and power capabilities, from less than 10mm square to over 50mm square. They are typically 2mm to 5mm in height. A list of some Peltier cell manufacturers is given in Table 3 and some recommended part numbers in Table 4. COMPONENT SELECTION Step-Up Transformer The turns ratio of the step-up transformers will determine how low the input voltage can be for the converter to start. Due to the auto-polarity architecture, two identical step-up transformers should be used, unless the temperature drop across the TEG is significantly different in one polarity, in which case the ratios may be different. Table 3. Peltier Cell Manufacturers CUI Inc www.cui.com Ferrotec www.ferrotec.com/products/thermal/modules/ Fujitaka www.fujitaka.com/pub/peltier/english/thermoelectric_power.html Hi-Z Technology www.hi-z.com Kryotherm www.kryotherm Laird Technologies www.lairdtech.com Micropelt www.micropelt.com Nextreme www.nextreme.com TE Technology www.tetech.com/Peltier-Thermoelectric-Cooler-Modules.html Tellurex www.tellurex.com/ Table 4. Recommended TEG Part Numbers by Size MANUFACTURER 15mm 20mm 30mm 40mm CUI Inc. (Distributor) CP60133 CP60233 CP60333 CP85438 Ferrotec 9501/031/030 B 9501/071/040 B 9500/097/090 B 9500/127/100 B Fujitaka FPH13106NC FPH17106NC FPH17108AC FPH112708AC Kryotherm TGM-127-1.0-0.8 LCB-127-1.4-1.15 Laird Technology PT6.7.F2.3030.W6 PT8.12.F2.4040.TA.W6 Marlow Industries RC3-8-01 RC6-6-01 RC12-8-01LS Tellurex C2-15-0405 C2-20-0409 C2-30-1505 C2-40-1509 TE Technology TE-31-1.0-1.3 TE-31-1.4-1.15 TE-71-1.4-1.15 TE-127-1.4-1.05 |
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