The document summarizes resonant inverters, which use resonant current oscillation to reduce switching losses. It classifies resonant inverters into eight types, including series resonant inverters, parallel resonant inverters, and Class E resonant converters. Circuit diagrams and operating principles are provided for series resonant inverters and Class E resonant inverters. Applications mentioned include use in low power applications and high frequency electric lamps.

1. Jyotiprakash Lenka
Dept. of Electrical &Electronics
Engineering
Regd No-1021288015
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2.  Introduction
 Classification
 Conclusion
 Reference
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3.  Resonant inverters are electrical inverter based
on resonant current oscillation. It is known as DC to
DC Converter or Dc to Ac PWM inverter.
 Main function is to reduce switching losses of the
devices(MOSFET&IGBT).
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4.  The Resonant Converter broadly Classified into Eight
types. Those are:-
1. Series Resonant inverter
2. Parallel Resonant inverter
3. Class E Resonant Converter
4. Class E Resonant Rectifier
5. Zero Voltage Switching(ZVS) Resonant Converter
6. Zero Current Switching(ZCS) Resonant Converter
7. Two Quadrant ZVS Resonant Converter
8. Resonant dc-link inverter
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5.  It is Based on resonant current oscillation.
 Switching device are placed in series with Load.
 Thyristor are work in switching device.
 This type of inverter produces an approximately
sinusoidal wave form at a high Frequency ,ranging
from 200Hz to 100KHz.
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6. Circuit dig. of series Resonant Converter
Equivalent circuit dig. Waveform 4/13/2013 6

7.  Parallel Resonant inverter is dual of series resonant
inverter
 Current is continuously controlled , that gives better
short circuit protection under fault condition
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8.  It has low switching losses , yielding a high efficiency
of more than 95%.
 Used in low power application & high frequency
electric lamp.
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9. Circuit Dig. of class E Resonant inverter & Wave Form
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10.  Class E Resonant Rectifier is based on the principle of
Zero Voltage Switching(ZVS) .
 The diode turn off at zero voltage.
 A high frequency diode rectifier suffers from
disadvantage that is switching losses , harmonic
content.
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12.  The ZVS Resonant Converter turn on & turn off at zero
voltage.
 Output voltage control can be achieved by varying the
frequency & operates with constant off time control .
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14.  Zero Current Switching(ZCS) Resonant Converter turn
On & turn off at zero current.
 This converter can operate at higher range frequency
that is 1MHz to 2Mhz.
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17. 
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19.  The DC link inverter is similar to the PWM inverter .
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21.  It is used for high frequency application.
 ZCS&ZVS becomes popular and they can turn ON
&turn OFF at zero voltage&current and also eliminate
switching losses.
 In dc-link inverters , a resonant circuit is connected
between the inverter & DC supply.
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22. 1. Muhammad H. Rashid ,”Power Electronics”
,Pearson publication,5th Edition, Ch-8, pg-352 to 404
2. P.S. Bimbhra,”Power Electronics”, Khanna
Publication,3rd Edition, Ch -11, pg-572 to 581
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