Abstract
The dead zone in the buck converter can be eliminated by integrating flyback converter with it. However, its input Power Factor (PF) is low when operated with Constant On-Time Control (COTC). In this paper, a Variable On-Time Control (VOTC) strategy is proposed for Integrated Buck-Flyback Converter (IBFC) with simple structure to obtain unity PF. By feed forwarding input and output voltage to change the on-time of both switches, high PF can be achieved. The operating principle of the IBFC is discussed with both types of control schemes and for verifying the effectiveness of VOTC scheme; simulations are carried out by using Saber simulator. Keywords: Constant On-Time Control (COTC), Integrated Buck-Flyback Converter (IBFC), Variable On-Time Control (VOTC) Scheme
Highlights
Power electronic technology is used in various types of modern equipment’s which has made our life easier, simpler and luxurious
Unity P.F cannot be realized when the on-time is constant. It is necessary for the integrated buck-flyback converter to propose the technique which can realize unity Power Factor (PF) with simple structure and minimum losses
A Variable On-Time Control (VOTC) strategy is introduced for Integrated Buck-Flyback Converter (IBFC) to realize unity PF with minimum component cost. It requires one Bridge Rectifier (BR) and for passing the low frequency current to reduce losses, EMI filter is located after BR
Summary
Power electronic technology is used in various types of modern equipment’s which has made our life easier, simpler and luxurious. Unity P.F cannot be realized when the on-time is constant It is necessary for the integrated buck-flyback converter to propose the technique which can realize unity PF with simple structure and minimum losses. Integrated Buck-Flyback Converter (IBFC) for low cost, high PF and fast output voltage regulations is implemented in[6]. A new topology which combines buck and flyback converter to eliminate the dead zone is put forward in[10]. A VOTC strategy is introduced for IBFC to realize unity PF with minimum component cost It requires one Bridge Rectifier (BR) and for passing the low frequency current to reduce losses, EMI filter is located after BR.
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