EE Power Electronics – Lecture Notes (All Units) – Edition. Anna University. Department of Electrical & Electronics Engineering. Anna University Regulation EEE EE PE Notes, Power Electronics Lecture Handwritten Notes for all 5 units are provided below. POWER ELECTRONICS DEVICES Characteristics of power devices – characteristics of SCR, diac, triac, SCS, GTO, PUJT – power transistors – power FETs.

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Diode D prevents any current flow from capacitor to the source.

UNIT III DC Choppers.

We think you have liked this presentation. Malvino chapter 3, Next: To obtain full output voltage range, frequency has to be varied over a wide range. In step up chopper output voltage is more than input voltage. The current tends to decrease resulting in reversing the polarity of induced EMF in L. Step-up chopper is used to obtain a load voltage higher than the input voltage V. If the load voltage is volts, calculate the conduction period of the thyristor in each cycle.


Compute Chopping frequency, If the pulse width is halved for constant frequency of operation, find the new output voltage. Widely used for motor control. Current flows from supply to load. Auth with social network: Also known as dc-to-dc converter.

Published by Myrtle Dickerson Modified about 1 year ago. Also used in regenerative braking.

Thyristor converter offers greater efficiency, faster response, lower maintenance, smaller size and smooth control. Duty cycle d can be varied only between a min. Feedback Privacy Policy Feedback. How does a buck converter operate? If you wish to download it, please recommend it to your friends in any social system. A variable dc voltage is obtained from a constant dc voltage source. When the chopper is ON, the inductor L is connected across the supply.

Nasar Electric Drives. When thyristor is ON, supply voltage appears across the load When thyristor is OFF, the voltage across the load will be zero.


Malvino chapter 3, 4. Ripple in the load current depends inversely on the chopping frequency, f. Share buttons are a elecronics bit lower. To reduce the load ripple current, frequency should be as high as possible. Pulse width modulation control or constant frequency operation. M Buck Converter Objective is to answer the following questions: My presentations Profile Feedback Log out.


In step down chopper output voltage is less than input voltage.

To make this website work, we log user data and share it with processors. The thyristor in the circuit acts as a switch. The values of L and C are chosen depending upon the requirement of output voltage and current.

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Malvino chapter 3, Next:. Step up choppers are used for regenerative braking of dc motors. The output required is V. When chopper is ON, its voltage drop is 1.

About project SlidePlayer Terms of Service. When chopper is ON, its voltage drop is 2 V and the chopping frequency is 1 kHz.