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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Auth with social network: Malvino chapter 3, Next:.

Also known as dc-to-dc converter. M Buck Converter Objective is to answer the following questions: When thyristor is ON, supply voltage appears across the load When thyristor is OFF, the voltage across the load will be zero.

Current flows from supply to load.

To noyes the load ripple current, frequency should be as high as possible. Published by Myrtle Dickerson Modified about 1 year ago. How does a buck converter operate? To use this website, you must agree to our Privacy Policyincluding cookie policy.

If you wish to download it, please recommend it to your friends in any social system. Widely used for motor control.


In step up chopper output voltage is more than input voltage. A elecrronics dc voltage is obtained from a constant dc voltage source. In step down chopper output voltage is less than input voltage.

UNIT III DC Choppers. – ppt download

The current tends to decrease resulting in reversing the polarity of induced EMF in L. Nasar Electric Drives. Malvino chapter 3, 4. The values of L and C are chosen depending upon the requirement of output voltage and current.

UNIT III DC Choppers.

The thyristor in the circuit acts as a switch. To obtain full output voltage range, frequency has to be varied over a wide range. Pulse width modulation control or constant frequency operation.

Also used in regenerative braking. Thyristor converter offers greater efficiency, faster response, lower maintenance, smaller size and smooth control.

EE6503 PE Notes, Power Electronics Lecture Handwritten Notes – EEE 5th SEM Anna University

We think you have liked this presentation. Duty cycle d can be varied only between a min.

When the chopper is ON, the inductor L is connected across the supply. Share buttons are a little bit lower. When chopper is ON, its voltage drop ee230 2 V and the chopping frequency is 1 kHz.


The output required is V. Ripple in the load current depends inversely on the chopping frequency, f. Malvino chapter 3, Next: Diode D prevents any current flow from capacitor to the source.

When chopper botes ON, its voltage drop is 1. Step up choppers are used for regenerative braking of dc motors. Feedback Privacy Policy Feedback. To make this website work, we log user data and share it with processors. Step-up chopper is used to obtain a load voltage higher than the input voltage V.

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EE PE Notes, Power Electronics Lecture Handwritten Notes – EEE 5th SEM Anna University

Compute Chopping frequency, If the pulse width is halved for constant frequency of operation, find the new output voltage. My presentations Profile Feedback Elecctronics out. If the load voltage is volts, calculate the conduction period of the thyristor in each cycle. Registration Forgot your password?