A New Active Snubber Circuit for PFC Converter by BURAK

Author:BURAK
Language: eng
Format: epub
Tags: Power factor correction (PFC), soft switching (SS), ZCS, ZCT, and ZVT

Figure 3. Key waveforms of the operation stages

Stage 11 [ ti2<t<ti 3 : Fig.2(k) ]

Cs is charged linearly with constant L current and C R is discharged. At t=ti 3 , when C s capacitor voltage reaches to V 0 , C R capacitor voltage falls to zero and D F diode is turned on with ZVS.

Stage 12 [ ti 3 <t<ti4 : Fig.2(l) ]

During this stage, the main diode D F conducts input current Ii and the snubber circuit is not active. This time period is determined by the PWM control and large part of the off state of the converter. Finally, at t=ti4=to, one switching period is completed and then next switching period starts.

EXPERIMENTAL RESULTS

A prototype of a 300 W and 100 kHz PFC converter is shown in Fig. 4 to verify the predicted analysis of the

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©2010 ACEEE DOI: 01.ijepe.01.02.09

^•ACEEE

ACEEE International Journal on Electrical and Power Engineering, Vol. 1, No. 2, July 2010

proposed converter. The PFC converter is obtained by adding ZVT-ZCT-PWM active snubber circuit to the boost converter, which is fed by universal input AC line. The boost converter consists of the main inductance L F , the main switch Si with the antiparallel diode D S i and the main diode D F . The active snubber circuit consists of the auxiliary switch S2, four auxiliary diodes Di, D 2 , D 3 ,and D 4 , the snubber inductances Lri and L R2 with the coupling inductance and the snubber capacitor C R . For output receiver, resistive load is aplied to the output of the converter.

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