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CU-Boulder ECEN 4517 - A Three-part Experiment

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ECEN 45171Exp. 3: A three-part experiment: 5 weeksExp. 3 Part 1: 3 weeksDemonstrate dc-dc converter power stage operating open loop, driven by MSP430 PWM outputInside, with input power supply and resistive loadOutside, between PV panel and batteryDC system simulationExp. 3 Parts 2 and 3: 2 weeksDemonstrate working sensor circuitry, interfaced to microprocessorDemonstrate peak power tracker and battery charge controller algorithms, outside with converter connected between PV panel and batteryECEN 451721.1 design and construct the inductor1.2-1.4 demonstrate dc-dc power stage on the bench1.5 demonstrate dc-dc power stage with PV panel outside1.6 simulation and interpretation of data [D2L module and quiz will be posted]Exp. 3, Part 1TasksECEN 45173Layout issuesECEN 45174ECEN 45175ECEN 45176ECEN 45177ECEN 45178Gate drive circuitwith transformer isolation• Gate driver output vd(t) has a dc component when d ≠ 0.5• Transformer will saturate if we apply dc• Primary blocking capacitor removes dc component• Secondary capacitor and diodes form a diode clamp circuit that restores the dc componentECEN 45179Gate driver transformer• Use ferrite toroid in your kit• Leakage inductance is minimized if bifilar winding is used• Need enough turns so that applied volt-seconds do not saturate core:∆B = V1DTs /n1AcECEN 451710Alternate smaller version of gate driver• Uses only one gate driver instead of two, to produce half the voltage swing on primary• Transformer turns ratio is 1:1• Produces half as much gate current• Suitable for smaller MOSFETsECEN 451711Discussion of construction and layout


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CU-Boulder ECEN 4517 - A Three-part Experiment

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