Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/196560
Title: Self-Compensating OCP Control Scheme for Primary-Side Controlled Flyback AC/DC Converters
Authors: Zhangming Zhu;Qiang Wu;Zeyu Wang
Year: 2017
Publisher: IEEE
Abstract: Primary-side controlled universal-line flyback converters have been widely used in low-power applications due to their simplicity, low standby power, and low cost. However, conventional OCP schemes normally cause too large a variation in output current when the input voltage varies. This paper proposes a self-compensating OCP circuit to achieve a high-precision constant current at different input voltages which can be used in flyback converters working in discontinues conduction mode. It consists of a CS S/H circuit and a dynamic OCP voltage reference circuit. Compared with conventional OCP circuits, it does not need an extra compensation circuit. To verify the feasibility and performance of the proposed circuit, an IC controller that uses the proposed OCP circuit has been designed and fabricated in 0.35 &x03BC;m 5-V/40V high-voltage CMOS technology. Experimental results show that the constant output current precision of the prototype is within &x00B1;1% when the input line voltage changes from 85 to 265 Vac. In the common line voltage range (110-220 Vac), the output current regulation accuracy can reach a level as high as &x00B1; 0.3%.
URI: http://localhost/handle/Hannan/196560
volume: 32
issue: 5
More Information: 3673,
3682
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7505651.pdf1.27 MBAdobe PDF
Title: Self-Compensating OCP Control Scheme for Primary-Side Controlled Flyback AC/DC Converters
Authors: Zhangming Zhu;Qiang Wu;Zeyu Wang
Year: 2017
Publisher: IEEE
Abstract: Primary-side controlled universal-line flyback converters have been widely used in low-power applications due to their simplicity, low standby power, and low cost. However, conventional OCP schemes normally cause too large a variation in output current when the input voltage varies. This paper proposes a self-compensating OCP circuit to achieve a high-precision constant current at different input voltages which can be used in flyback converters working in discontinues conduction mode. It consists of a CS S/H circuit and a dynamic OCP voltage reference circuit. Compared with conventional OCP circuits, it does not need an extra compensation circuit. To verify the feasibility and performance of the proposed circuit, an IC controller that uses the proposed OCP circuit has been designed and fabricated in 0.35 &x03BC;m 5-V/40V high-voltage CMOS technology. Experimental results show that the constant output current precision of the prototype is within &x00B1;1% when the input line voltage changes from 85 to 265 Vac. In the common line voltage range (110-220 Vac), the output current regulation accuracy can reach a level as high as &x00B1; 0.3%.
URI: http://localhost/handle/Hannan/196560
volume: 32
issue: 5
More Information: 3673,
3682
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7505651.pdf1.27 MBAdobe PDF
Title: Self-Compensating OCP Control Scheme for Primary-Side Controlled Flyback AC/DC Converters
Authors: Zhangming Zhu;Qiang Wu;Zeyu Wang
Year: 2017
Publisher: IEEE
Abstract: Primary-side controlled universal-line flyback converters have been widely used in low-power applications due to their simplicity, low standby power, and low cost. However, conventional OCP schemes normally cause too large a variation in output current when the input voltage varies. This paper proposes a self-compensating OCP circuit to achieve a high-precision constant current at different input voltages which can be used in flyback converters working in discontinues conduction mode. It consists of a CS S/H circuit and a dynamic OCP voltage reference circuit. Compared with conventional OCP circuits, it does not need an extra compensation circuit. To verify the feasibility and performance of the proposed circuit, an IC controller that uses the proposed OCP circuit has been designed and fabricated in 0.35 &x03BC;m 5-V/40V high-voltage CMOS technology. Experimental results show that the constant output current precision of the prototype is within &x00B1;1% when the input line voltage changes from 85 to 265 Vac. In the common line voltage range (110-220 Vac), the output current regulation accuracy can reach a level as high as &x00B1; 0.3%.
URI: http://localhost/handle/Hannan/196560
volume: 32
issue: 5
More Information: 3673,
3682
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7505651.pdf1.27 MBAdobe PDF