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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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CAS-D20TB Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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CAS-D20TB Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
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6 / 8 page  OPERATION The EHE004 performance was measured while connected to a Volture™ V25W piezoelectric energy harvester. The system was properly clamped and tuned using the procedures detailed in the Volture™ datasheet. The assembly was attached to a shake table to generate vibrations to test the system. The shake table was driven by a function generator and the amplitude was measured with an accelerometer. To determine average power, the output duty cycle at the known output voltage over a fixed 1.00K-ohm load was measured. Performance measurements were taken at 0.25g, 0.50g, 0.75g, and 1g amplitudes. The lowest amplitude at which the EHE004 input exceeded the UVLO threshold, producing a usable output, was also recorded. The figure below shows the results for these tests. For the same amplitude conditions, other Volture™ products would exhibit similar performance characteristics though with different power output levels. Typical average power output levels for Volture™ energy harvesting products can be found on the Volture™ datasheet. This representative figure shows how the different settings on the EHE004 can be used most efficiently given the vibration profile that this specific energy harvester with this tip mass was subjected to. For lowest amplitude vibrations (in this instance below 0.175 gee) 6 REVISION N0. 002 REVISION DATE: 01-23-2013 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 V25W, 1.8V, 75 Hz, 2.4 gram Tip Mass, Reg Cap Amplitude (g) Normal, Series Normal, Parallel Superseries, Series Superseries, Parallel Vout setting (V) UVLO rising (V) UVLO falling (V) Vmpp (V) 1 Vmin (V) 2 Vripple @ Vin=UVLO (mV) 3 Vripple @ Vin=20 (mV) 3 1.8 4.04 2.87 7.4 3.1 120 160 2.5 4.04 2.87 7.5 3.1 120 160 3.3 5.05 3.67 9.3 3.6 140 280 3.6 5.05 4.02 9.6 3.6 160 300 NOTE 1: Approximate maximum power point (open- circuit piezo voltage) at which power transfer to the load is maximized. NOTE 2: Minimum start-up voltage in halfbridge (“superseries”) configuration. NOTE 3: Ripple values measured at no load and the 10uF onboard output capacitance. PERFORMANCE PLOTS EHE004 |
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