Modeling and Simulation

of a

Series Resonant Inverter

with

RL Load Sreeram Navya Sri

2009A3PS286U Inverter Inverter converts DC to AC DC sources – solar panels and batteries

AC current – any voltage or frequency using suitable transformers and switching devices Series resonant inverters (SRI) Based on resonant current oscillation

Resonating components and the switching devices are in series with the load to from an underdamped circuit

Approximately sinusoidal wave

High output frequency ranging from 20kHz to 100kHZ

Small resonating componets due to high switching frequency

induction heating

sonar transmitters

fluorescent lighting

ultrasonic generator Applications Contents Literature Survey All metal domestic induction heating Domestic induction appliances can only heat ferromagnetic pans. A number of non-ferromagnetic pans made up aluminium, copper, copper-nickel and stainless steel cannot be properly heated by this technology. Models capable of heating ferromagnetic and non-ferromagnetic pans are called all-metal induction cookers.

Millan et al. have developed a topology which uses minimum number of components as compared to others. It is based on a modified half-bridge topology with two selective operation modes. The performance of this topology is high with ferromagnetic pans and acceptable with non-ferromagnetic pans Electronic ballast in fluorescent lights Samuel S. M. Chan et al. presented a low cost method of modifying a non-dimmable electronic ballast into a dimmable one by increasing the switching frequency of the self oscillating series resonant inverter from the natural frequency of the resonant tank. Thin film sputtering of desired material Woratut et al. have presented an application of half-bridge class D series-parallel-resonant inverter for plasma-driven circuit. Under environment of Argon gas this prototype can sputter thin film of Titanium on a glass slide. Vicente Esteve et al. have successfully tested a voltage-source series resonant PDM (Pulse Density Modulation) inverter prototype with IGBT for induction heating industrial applications. Oscar Lucia et al. have proposed half- bridge series resonant inverter with variable frequency duty cycle (VFDC) control to improve efficiency of low and medium power range and power loss reduction with low quality factor loads (like domestic induction heating) by means of a switching-frequency reduction Classification of Series Resonant Inverter Induction Heating in Industrial Applications Improve Efficiency of low quality loads Series inverters can be classified into two categories:

Series resonant inverter with unidirectional switches

Series resonant inverter with bidirectional switches Unidirectional Switches Bidirectional switches Series Resonant Inverter with Unidirectional Switches T1 fired, resonant of current flows through the load. The current falls to zero at and T1 is “self – commutated”.

T2 fired, reverse resonant current flows through the load and T2 is also “self-commutated”. MODE 1 MODE 2 MODE 3 There are three modes of operation T1 is fired Capacitor is initially charged to -Vc

1) more current

2) Indirectly thyristor T2 is reversed

biased

hence T2 is OFF After applying Laplace transform This mode is valid from t=0 to t=t1m T2 is ON Redefining the time origin, t=0, at the beginning of the mode.

This mode is valid from t=0 to t=t3m Applying Laplace Transform Disadvantages of using Unidirectional Switches References The power devices have to be turned on in every half-cycle of the output voltage. This limits the inverter frequency and the amount of energy transfer. The power devices are subjected to high peak reverse voltage. Output frequency is limited to Dc and AC waveforms Basic Series Resonant Inverter Basic Series Resonant Inverter showing the direction of current in Mode 1 Mode 1 Equivalent Circuit Waveform Mode 1 Equivalent Circuit Waveform Mode 2 Equivalent Circuit Waveform Mode 2 Equivalent Circuit Waveform Basic Series Resonant Inverter showing the direction of current in Mode 3 Mode 3 Equivalent Circuit Waveform Mode 3 Equivalent Circuit Waveform Inverter

Series Resonant Inverter

Classification of Series Resonant Inverter

Series Resonant Inverter with Unidirectional Switches

Disadvantages of Using Unidirectional Switches

Series Resonant Inverter with Bidirectional Switches

Analysis taking the transformer into effect

Conclusion

References http://ieeexplore.ieee.org/Xplore/guesthome.jsp

http://en.wikipedia.org/wiki/Power_inverter

http://en.wikipedia.org/wiki/Resonant_inverter

http://books.google.ae/books/about/Power_Electronics_Circuits_Devices_and_A.html?id=-WqvjxMXClAC&redir_esc=y

http://www.faculty.umassd.edu/xtras/catls/resources/binarydoc/3873.ppt Future Work Study and analysis of series resonant inverter with bidirectional switches taking the effect of transformer (on the load side) into consideration. Basic series resonant inverter with bidirectional switches SRI with Bidirectional Switches Performance is improved Basic Series Resonant Inverter with Bidirectional Switch Analysis of SRI with Bidirectional Switches When Power Device is Switched ON When Q1 is switched ON Voltage Balance Equation is: When Power Device is Switched OFF When Q2 is switched OFF

Capacitor acts as a source

Resonant current direction reverses Analysis taking the transformer into effect Final expression of current i2 Final expression of current i1 Conclusion Analysis of the series resonant inverter with bidirectional switches varies when the transformer effect is taken on the load side.

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