Instructor Eng Jalal Al Roumy The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department بسم الله الرحمن الرحيم ID: 238504
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Slide1
POWER ELECTRONICS
Instructor: Eng. Jalal Al Roumy
The Islamic University of Gaza
Faculty of Engineering
Electrical Engineering Department
بسم الله الرحمن الرحيم
EELE 5450
—
Summer 2012
Lecture
23Slide2
STEP-UP CHOPPERS
The chopper can be used to step up voltage as well as to step it down; it behaves in fact like a
d.c
. transformer. Slide3
STEP-UP CHOPPERS
When the transistor is switched on, current ramps up in the inductor and energy is stored. When the transistor is switched off, the inductor voltage reverses and acts together with the battery voltage to forward bias the diode, transferring energy to the capacitor. Slide4
STEP-UP CHOPPERS
When the transistor is switched on again, load current is maintained by the capacitor, energy is stored in the inductor and the cycle can start again. The value of the load voltage is increased by
increasing the
duty cycle or the on-time of the transistor.Slide5
Error1:
D=tn/T
Error2:Vo=vb(1+DT/TT(1-D).Slide6
STEP-UP CHOPPERS
When the steady variation of battery current has been reached, the variation will be between Io and I1Slide7
STEP-UP CHOPPERSSlide8
STEP-UP CHOPPERSSlide9
STEP-UP CHOPPERS
End of Lecture