Nt1310 Unit 4 Lab Report

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IV. PROPOSED CONVERTER WITH MAGNETIC COUPLING
Power Circuit With Magnetic coupling

Fig.4 SEPIC Converter With Magnetic Coupling The classical SEPIC and modified SEPIC without magnetic coupling is as shows fig. 3 and 4. Boost converter gain is half of the SEPIC converter without magnetic coupling but in some application extreme high gain is needed in such cases without magnetic coupling SEPIC converter compactable. One practical limitation of SEPIC converter is duty cycle should not be high because if duty cycle close to unity the static gain goes to infinity. To replaced L2 to mutual inductance which will acts as flyback transformer and its turns ratio increase the gain of the converter. But use mutual inductance developed reverse recovery …show more content…

Third Stage[t2-t3](Fig.9): At instant t2 The switch is turned off at the time t2. energy stored in L1 transfer to the Capacitor CM and also energy transfer through capacitor CS1 and CS2
4. Fourth Stage[t3-t4](Fig.10) : At time t3, CM finished energy get transfer at that instant the diode D1 is blocked. The energy transfer to output maintain till t4 till power switch is turn on.
5. Fifth Stage[t4-t5](Fig.11): When the Power switch is turn on at t4,the current is linearly decease of D0.which limits the reverse recovery current. when DO blocked the converter return to first stage.
The static gain of the modified SEPIC converter with magnetic coupling and voltage multiplier is calculated by (4).

where the inductor windings turns ratio (n) is calculated by

Considering a duty cycle equal to 0.8, a static gain equal to q = 10 is obtained for n = 1, q = 15 for n = 2 and q = 20 for n = 3 and the switch voltage is equal to five times the input voltage for all cases. The static gain variation as a function of the duty cycle is presented in Fig. 10.

V. SIMULATION RESULTS
Using MATLAB /SIMULINK software model of single-ended primary inductance converter (SEPIC) with magnetic coupling modeled and simulated. The parameters for preferred converter with magnetic coupling are shown in

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