Design improvements for Primary-Side-Regulated high-power flyback converters in Continuous-Conduction-Mode

Keogh, Bernard; Long, Billy; Leisten, J. M.

doi:10.1109/apec.2015.7104395

Cited by 20 publications

(4 citation statements)

References 5 publications

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“…If ΔI pm (n − 1) and ΔI pav (n − 1) both exist, ΔI pm (n) and Δt on (n − 1) can be obtained based on (9) to (14). The relationship of ΔI pm (n), ΔI pav (n), ΔI pm (n − 1), ΔI av (n − 1) can be expressed in (15), (16), and (17).…”

Section: Ipav Nmentioning

confidence: 99%

“…[6][7][8][9][10][11] To improve the power density, continuous conduction modulation (CCM) mode will be introduced. [13][14][15][16] In digital control, the inductor average current is always required for the output current estimation. When CCM mode is used, the average inductor current is always acquired with an analog-to-digital converter (ADC) to sample the valley point, the peak point, or the midpoint of the inductor current.…”

Section: Introductionmentioning

confidence: 99%

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A simple average current control with time‐length equality for primary‐side regulation flyback converter with constant output current control

Wang

Kou

et al. 2018

Circuit Theory & Apps

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Primary-side regulation (PSR) flyback converter is widely used in small power applications. To increase the output power, continuous conduction modulation mode is always introduced. In this paper, a simple average current control method with very low cost is proposed for constant current controlled PSR flyback converter in both continuous conduction modulation mode and discontinuous conduction modulation mode. The average current control method is realized with time-length equality by simply comparing the average current with switch current, such that analog-to-digital converter for current sampling in traditional average current control method is removed. In addition, to eliminate the subharmonic oscillation and keep low cost, a fixed switch-off time control with time-length compensation algorithm is used. To improve the output current accuracy, a hysteretic multimode control method is applied. The total control requires very low implementation costs that only contain a lowspeed Digital to analog converter (DAC), three comparators, and a digital controller. The performance of the proposed control method is experimentally verified on an Field-progrannable gate array (FPGA) controlled 3.8 to 16 V/3.8 A PSR flyback converter. In experiments, stable control and high output current accuracy are obtained, and the output current accuracy is within ±1.8% under universe line voltage and output load.

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Section: Ipav Nmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A simple average current control with time‐length equality for primary‐side regulation flyback converter with constant output current control

Wang

Kou

et al. 2018

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…Furthermore, a distinct functional advantage of PSR derives from having an absolute measure of the output voltage. Primary-side Constant Current/Constant Voltage converters are generally operated in BCM or DCM, and rarely used in CCM, except for high power applications [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Design of Medium Power AC-DC Flyback LED Driver

Yoppy

Hidayat

Nugroho

et al. 2021

Indonesian J. Electron. Instrum. Syst.

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LED lighting market share shows an ever increasing trend. This is driven by some of the LED advantages, such as higher efficiency, wide range of colors, and longer lifetime. LED is a DC device, and to power it from AC supply, like in household or street lightings, a driver is required to convert AC to DC supply. In addition, LED driver is preferred to operate in constant current mode in order to avoid LED thermal runaway. Also the driver has to have high efficiency, low THD (total harmonic distortion), and comply with electromagnetic emission limits. In this paper, a prototype of primary-side-regulated AC-DC flyback LED driver has been implemented. It has a constant output current of 0.990A 0.012A across the output voltage 15.59V – 42.80V. Measurement results show that the achieved efficiency is up to 88.55%, current harmonics comply with IEC 61000-3-2, and conducted emission levels comply with CISPR 15.

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“…Several factors have been considered to be related with the cross‐regulation effect in the previous literatures, such as the conduction losses of rectifier diode , the clamp voltage settled by primary side resistor‐capacitor‐diode (RCD) circuit and the leakage inductance between primary winding and those secondary windings . In some other works, the analysis of the cross‐regulation effect between the output windings is given based on either qualitative analysis or experimental results .…”

Section: Introductionmentioning

confidence: 99%

Analysis and improvement of cross‐regulation effect in the primary side‐regulated multi‐output flyback converter

Guo

Luan

Liu

et al. 2017

Circuit Theory & Apps

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In the multi-output primary side-regulated (PSR) flyback converters, cross-regulation effect denotes the phenomenon that change of load current in either one of the outputs would lead to the output voltage variations in other output terminals. Because the PSR flyback converters are frequently used to provide power supplies in a power system, the steady operation of the power system may be affected. Based on an improved Cantilever model, this paper proposes a thorough analysis on the cross-regulation effect in the PSR flyback converter. It has been found that the coupling between the output windings and the topology of the output terminal would have significant influence on the cross-regulation effect. Moreover, a mathematical expression has been derived to calculate the relationship, in the time domain, between the voltages of the output windings in the PSR flyback converter. In the mathematical expression, the leakage inductances in the improved cantilever model are lumped into a matrix R 0 . Hence, the winding method and the geometry of the transformer can be optimized to improve the precision of the multi-output voltages in the PSR flyback converter. A 10-W PSR flyback prototype with three output terminals is built. Experimental results are given to validate the theoretical analysis.where R L2 , R L3 and R L4 are the equivalent load resistance of the three output terminals V 2 , V 3 and V 4 . 1306 X. GUO ET AL.

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Design improvements for Primary-Side-Regulated high-power flyback converters in Continuous-Conduction-Mode

Cited by 20 publications

References 5 publications

A simple average current control with time‐length equality for primary‐side regulation flyback converter with constant output current control

A simple average current control with time‐length equality for primary‐side regulation flyback converter with constant output current control

Design of Medium Power AC-DC Flyback LED Driver

Analysis and improvement of cross‐regulation effect in the primary side‐regulated multi‐output flyback converter

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