High precision control technique for constant current regulation in primary‐side regulation systems

Wang, Zeyu; Lai, Xiaojun; He, Huisen

doi:10.1049/el.2014.3331

Cited by 18 publications

(7 citation statements)

References 3 publications

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“…I smin , I smax , and I sav are the minimum value, the maximum value, and the average current of i s during t r period. Because the output current calculated by (5) may fluctuate, the average value of output current from several continuous switching cycles is more stable and smooth as in (6). Because the output current calculated by (5) may fluctuate, the average value of output current from several continuous switching cycles is more stable and smooth as in (6).…”

Section: Lpmentioning

confidence: 99%

“…Considering the relationship between i p and i s , the output current can be expressed as in (5). Because the output current calculated by (5) may fluctuate, the average value of output current from several continuous switching cycles is more stable and smooth as in (6). I o is used for closed-loop control.…”

Section: Lpmentioning

confidence: 99%

“…[3][4][5][6][7][8][9][10][11][12] In PSR flyback converter, discontinuous conduction modulation (DCM) mode is mostly used for small power. [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.…”

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: Lpmentioning

confidence: 99%

Section: Lpmentioning

confidence: 99%

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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“…In addition, they suffer from CTR degradation over time and temperature [12]. The primary-side control scheme uses an auxiliary winding instead of opto-coupler to achieve the output voltage information [13,14,15,16]. However, it decreases the accuracy of output voltage and increases the size of transformer.…”

Section: Introductionmentioning

confidence: 99%

A synchronous rectified flyback AC-DC converter using capacitor-coupled isolated communication

2020

IEICE Electron. Express

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This paper presents a synchronous rectified (SR) flyback AC-DC converter based on capacitor-coupled isolated communication. Instead of bulky opto-couples as isolators, the proposed converter integrates an isolated capacitor to accomplish communication between the primary and secondary side, in an attempt to reduce system size. In secondary side, an adaptive zero-current detector (ZCD) for driving synchronous rectifier is adopted to increase efficiency. The converter is designed and fabricated in a 0.18-m BCD process. The experimental results demonstrate that our scheme shrinks the isolator size by a factor of 52.24 times and simultaneously improves the system efficiency by 3% with ZCD.

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“…In contrast, the primary-side control scheme achieves output regulation without the feedback loop from secondary side. Owing to its elimination of opto-coupler, this type of converter results in lower cost, higher power density, lower standby power and simpler control circuit [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Digital regulation scheme for multimode primary‐side controlled flyback converter

Cheng

Wang

et al. 2016

IET Power Electronics

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This study described a novel digital regulation scheme for multimode primary-side controlled flyback converter. This approach ensured good energy continuity at the modes transition points of the converter. Compared with the normal control methods, the proposed digital regulation scheme could achieve smooth modes transition and suppress the large output voltage ripple when the converter works at the boundaries of different working modes. A prototype of a multimode primary-side controlled flyback converter had been made to verify the proposed digital regulation scheme.

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High precision control technique for constant current regulation in primary‐side regulation systems

Cited by 18 publications

References 3 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

A synchronous rectified flyback AC-DC converter using capacitor-coupled isolated communication

Digital regulation scheme for multimode primary‐side controlled flyback converter

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