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Implementation of An Active-Clamped Full-

Wave ZCS of Quasi-Resonant Boost Converter

in Power Factor Correction Application

PRESENTED BY GUIDED BY

V.SENTHIL NAYAGAM, Mrs. JAYARAMAPRADEEP M.E.,(Ph.D)

Reg. No:31709415013, Associate Professor ± EEE,

St.Joseph¶s College of Engineering. St.Joseph¶s college of Engineering.

1St.joseph's College of Engineering



Contents Abstract

Block Diagram

Conventional Circuit Diagram (Diode Clamped Full-WaveZCS of Quasi-Resonant Boost Converter Circuit)

Conventional Circuit Drawbacks

Proposed Circuit diagram and its modes of operation(Active-Clamped Full-Wave ZCS of Quasi-ResonantBoost Converter Circuit)

Simulation circuit of Active-Clamped Full-Wave ZCS of

Quasi-Resonant Boost Converter Circuit and results Hardware Circuit and results

Advantages

Conclusion

References



Abstract

Boost converter generates switching losses at turn ON andOFF, results in reduction in the system efficiency.

Active-Clamped Full-Wave ZCS of Quasi-Resonant Boost

Converter utilizes a soft switching method using an Active-

Clamped circuit with a resonant inductor , capacitor , auxiliar y

switch and clamping diode.

Advantage of Active-Clamped Full-Wave ZCS of Quasi-

Resonant Boost Converter is reduced switching losses and

achieve high efficiency.

Soft switching boost converter is suitable for photovoltaicdc/dc converter s, power factor correction circuit and batter y

charger s.



Block Diagram



CONVENTIONAL CIRCUIT DIAGRAM



Conventional Circuit Drawbacks

� More EMI

� Ringing problem

� More switching losses



Active-Clamped Full-Wave ZCS of

Quasi-Resonant Boost Converter Circuit



Modes of Operation

Assumptions:-

All the switching devices and passive elements are ideal

Input voltage (Vin) is constant



Mode1

� I/P Voltage is given

� Main switch is

closed and Auxiliary

switch is open

� Current starts flowing

in the circuit

�& Starts charging

because of & resp.

� Diode is forward

biased and current

flowing through it.

� is charging.

r L1L

iV

1i Lr

i

1S

2S

bD

0c



Mode2

� In this mode resonant condition

takes place because and

comes into picture.

� Charge in reverse biases the

� Now current starts flowing

through

� Current through increases.

� At the end of this mode pulse

to is removed.

b

1S

r r c

r c

r

0c



Mode3

� is turned off

� Its voltage is reached toDuring this mode energy

stored on is dumped to

� discharges througho

coR

1s

1S V

r cC



Mode4

� Here stored energy in

is completely dumped

in . ,therefore

is turned off.

� Both and is off.

� Again and are

starts storing energy

(closed path is

maintained by )

r L

1sc

1s 2s

1L

r L

cC 1

02 r Lr L i !

1sD



Mode5

� Discharging of

makes the forward

biased.

� Now current flowsthrough and charges

the 0c

b

0c

b



Mode6

� Auxiliary switch is

turned on.

� Then

� Charge on dischargesand charges

� At the end of this mode,

pulse to is removed.

� Due to the dischargingof ,During next cycle

the switch can be

turned on at zero

voltage condition.

2s

20

S !

Lr 1s

2s

1s

1s

2s



SIMULATION CIR CUIT DIAGR AM



AC INPUT VOLTAGE AND CURRENT





DC OUTPUT CURRENT



DC OUTPUT POWER



Hardware Diagram

20



Hardware circuit

� The overall hardware circuits involves

� Power supply circuits� PIC Microcontroller

� Driver circuit

� Active-Clamped Full-Wave ZCS of Quasi-Resonant

Boost Converter Circuit

21



Hardware circuit

22



Pulses for switch S1 & S2

23



Driver output

24



ADVANTAGES

� Reduce the EMI

� Switching losses are less due to ZCS� Improve the efficiency



Applications

� Telecom applications

� Lamp Load.

� DC Motor Load.



CONCULSION

� In this Paper , A topology called active-clamped full-wave zero-current switched quasi-resonant boost converter s has beendemonstrated.

� Its basic operation principles and experimental results have beenpresented.

� This new topology has proven to be able to alleviate the voltageringing phenomena during switch turn-off period on a full-waveZCS-QR boost converter. Beside that, active clamp circuit also givesadditional benefit by adding ZVS characteristic to current converter.

� It has been shown that this technique performance is better if compared to former simple diode clamp topology in terms of efficiency, voltage regulation, and conducted EMI characteristics.



Reference

1. E. Firmansyah, S. Abe, M. Shoyama An Active-Clamped Full-

Wave Zero-Current-Switched Quasi-Resonant Boost

Converter in Power Factor Correction Application 2010 IEEE

2. E. Firmansyah, S. Tomioka, S. Abe, M. Shoyama, T. Ninomiya,Zero Current Switch-Quasi Resonant Boost Converter

Performance in Power Factor Correction Application ,Proc.

of APEC 2009, pp. 1165-1169..



continued

4.Muhammad Rashid ,´ Power electronics circuits

,devices and application ´.

5.Bimal .k.bose ,´modern power electronics and

drives ³

6.www.mathworks.com

7.http://www.epanorama.net/links/psu_general.htm

l#



THANK YOU

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