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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How does a buck converter operate?

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Widely used for motor control. Malvino chapter 3, Next:. Feedback Privacy Policy Feedback.

Step-up chopper is used to obtain a load voltage ellectronics than the input voltage V. In step down chopper output voltage is less than input voltage. Malvino chapter 3, 4. Pulse width modulation control or constant frequency operation.

Compute Chopping frequency, If the pulse width is halved for constant frequency of operation, find the new output voltage.



To reduce the load ripple current, frequency should be as high as possible. The thyristor in the circuit acts as a switch. A variable dc voltage is obtained from a constant dc voltage source.

Duty cycle d can be varied only between a min. We think you have liked this presentation. When thyristor is ON, supply voltage appears across the load When thyristor is OFF, the voltage across the load will be eldctronics. To use this website, you must agree to our Privacy Policyincluding cookie policy. Ripple in the load current depends inversely on the chopping frequency, f.

Auth with social network: When the chopper is ON, the inductor L is connected across the supply.

The current tends to decrease resulting in reversing the polarity of induced EMF in L. In step up chopper output voltage is more than input voltage. Nasar Electric Drives. Also used in regenerative braking. Also known as dc-to-dc converter. Diode D elecyronics any current flow from capacitor to the source. Share buttons are a little poewr lower. When chopper is ON, its voltage drop is 2 V and the chopping frequency is 1 kHz. To obtain full output voltage range, frequency has to be varied over a wide range.


Current flows from supply to load. The output required is V.

Power Electronics EE notes – Annauniversity lastest info

If the load voltage is volts, calculate the conduction period of the thyristor in each cycle. The values of L and C are chosen depending upon the requirement of output voltage and current. Registration Forgot your password? Thyristor converter offers greater efficiency, faster response, lower maintenance, smaller size and smooth control. Malvino chapter 3, Next: About project SlidePlayer Terms of Service.

Step up choppers are used for regenerative braking of dc motors. When chopper is ON, its voltage drop is 1. M Buck Converter Objective is to answer the following questions: My presentations Profile Feedback Log out. Published by Myrtle Dickerson Modified about 1 year ago.

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