Primary Side Control For Flyback Converter Operating in DCM and CCM

Primary side regulation (PSR) technology has the characteristics of lower cost and standby power losses. However, there is no algorithm suitable for discontinuous conduction mode (DCM) and continuous conduction mode (CCM) operations of primary side control for flyback converter because of the diffic...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2018-04, Vol.33 (4), p.3604-3612
Main Authors: Liang, Tsorng-Juu, Kai-Hui Chen, Jiann-Fuh Chen
Format: Article
Language:English
Subjects:
Algorithms
Continuous conduction mode (CCM)
Control algorithms
Control theory
Converters
Current control
discontinuous conduction mode (DCM)
Electric potential
Electronics
Equivalent circuits
flyback converter
Microcontrollers
Power loss
primary side controlled
Resistance
Sensors
Switches
Voltage control
Voltage drop
Windings
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Summary:Primary side regulation (PSR) technology has the characteristics of lower cost and standby power losses. However, there is no algorithm suitable for discontinuous conduction mode (DCM) and continuous conduction mode (CCM) operations of primary side control for flyback converter because of the difficulty in estimating the output voltage correctly. In this paper, a PSR control algorithm suitable for DCM/CCM flyback converter is proposed and implemented with digital micro controller. The voltage drop on the secondary winding and output diode at CCM operation is compensated by sensing the secondary side current at the instant when primary side switch is being turned-on. The secondary side current is zero at the voltage sensing instant and equal to the current at the instant when primary side switch is being turned-on as flyback operated at DCM. In addition, the proposed algorithm can be used to regulate either the output voltage or current very well. An experimental prototype with 150 W rated power is built to verify the feasibility of the proposed control. Experimental results show that the output voltage can be controlled with error less than 0.25%, and the output current error is less than 5%. The conversion efficiency is up to 92.8%.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2017.2709811