SEMICONDUCTOR INTEGRATED CIRCUITS

A PSR single-stage flyback LED driver with simple line regulation and quasi-resonant operation

Weidong Nie1, 2, , Zongguang Yu1, Haibing Wang2, Bin Guo2, Long Teng2 and Lihang Yang2

+ Author Affiliations

 Corresponding author: Nie Weidong, Email:youdanwd@163.com

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Abstract: A single-stage flyback driving integrated circuit (IC) for light-emitting diodes (LEDs) is proposed. With an average primary-side current estimation and negative feedback networks, the driver operates in the boundary conduction mode (BCM), while the output current can be derived and regulated precisely. By means of a simple external resistor divider, a compensation voltage is produced on the ISEN pin during the turn-on period of the primary MOSFET to improve the line regulation performance. On the other hand, since the delay time between the time that the secondary diode current reaches zero and the turn-on time of the MOSFET can be automatically adjusted, the MOSFET can always turn on at the valley voltage even if the inductance of the primary winding varies with the output power, resulting in quasi-resonant switching for different primary inductances. The driving IC is fabricated in a Dongbu HiTek's 0.35 μm bipolar-CMOS-DMOS process. An 18 W LED driver is finally built and tested. Results show that the driver has an average efficiency larger than 86%, a power factor larger than 0.97, and works under the universal input voltage (85-265 V) with the LED current variation within ±0.5%.

Key words: constant output currentsingle-stage flyback LED driverprimary-side-regulationquasi-resonant switchingline regulation



[1]
Li Y C, Chen C L. A novel single-stage high-power-factor AC-to-DC LED driving circuit with leakage inductance energy recycling. IEEE Trans Industrial Electron, 2012, 59(2):793 doi: 10.1109/TIE.2011.2151817
[2]
Dai Guoding, Yu Feng, Wang Xuan, et al. Design and implementation of a high precision and wide range adjustable LED driver controller. Journal of Semiconductors, 2010, 31(2):025010 doi: 10.1088/1674-4926/31/2/025010
[3]
Wang S, Ruan X, Yao K, et al. A flicker-free electrolytic capacitor-less AC-DC LED driver. IEEE Trans Power Electron, 2012, 27(11):4540 doi: 10.1109/TPEL.2011.2180026
[4]
Chou H H, Hwang Y S, Chen J J. An adaptive output current estimation circuit for a primary-side controlled LED driver. IEEE Trans Power Electron, 2013, 28(10):4811 doi: 10.1109/TPEL.2012.2236581
[5]
Nie W D, Wu J, Yu Z G. A simple cost-effective PSR LED driver without auxiliary winding. IEICE Electron Express, 2013, 10(23):1 http://www.jstage.jst.go.jp/browse/elex/10/23/_contents
[6]
Xie X G, Wang J, Zhao C, et al. A novel output current estimation and regulation circuit for primary side controlled high power factor single-stage flyback LED driver. IEEE Trans Power Electron, 2012, 27(11):4602 doi: 10.1109/TPEL.2012.2190523
[7]
Texas Instruments. Off-line primary side sensing controller with PFC (TPS92314). [Online] Available: http://www.ti.com/lit/ds/symlink/tps92314.pdf
[8]
STMicroelectronics. 10W wide range high power factor isolated LED driver using HVLED815PF800. [Online]Available: http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/DM00092673.pdf
[9]
Fairchild Semiconductor. Fairchild reference designfor FL7732. [Online] Available: http://www.fairchildsemi.com/support/referencedesign/docs/RD-L026.pdf
Fig. 1.  The proposed LED driver. (a) Control diagram. (b) Key control waveforms

Fig. 2.  Line regulation and valley turn-on circuit

Fig. 3.  Resonance waveforms of $V_{\rm d}(t)$ with (a) ADT and (b) FDT

Fig. 4.  Photograph of the driving IC

Fig. 5.  Output current with different external resistor divider values

Fig. 6.  Waveform of $V_{\rm d}(t)$ ($V_{\rm d}$: 100 V/div, time: 1 $\mu $s/div)

Fig. 7.  Measured efficiency and power factor

Table 1.   Key parameters of the prototype LED driver

Table 2.   Performance summary and comparison

[1]
Li Y C, Chen C L. A novel single-stage high-power-factor AC-to-DC LED driving circuit with leakage inductance energy recycling. IEEE Trans Industrial Electron, 2012, 59(2):793 doi: 10.1109/TIE.2011.2151817
[2]
Dai Guoding, Yu Feng, Wang Xuan, et al. Design and implementation of a high precision and wide range adjustable LED driver controller. Journal of Semiconductors, 2010, 31(2):025010 doi: 10.1088/1674-4926/31/2/025010
[3]
Wang S, Ruan X, Yao K, et al. A flicker-free electrolytic capacitor-less AC-DC LED driver. IEEE Trans Power Electron, 2012, 27(11):4540 doi: 10.1109/TPEL.2011.2180026
[4]
Chou H H, Hwang Y S, Chen J J. An adaptive output current estimation circuit for a primary-side controlled LED driver. IEEE Trans Power Electron, 2013, 28(10):4811 doi: 10.1109/TPEL.2012.2236581
[5]
Nie W D, Wu J, Yu Z G. A simple cost-effective PSR LED driver without auxiliary winding. IEICE Electron Express, 2013, 10(23):1 http://www.jstage.jst.go.jp/browse/elex/10/23/_contents
[6]
Xie X G, Wang J, Zhao C, et al. A novel output current estimation and regulation circuit for primary side controlled high power factor single-stage flyback LED driver. IEEE Trans Power Electron, 2012, 27(11):4602 doi: 10.1109/TPEL.2012.2190523
[7]
Texas Instruments. Off-line primary side sensing controller with PFC (TPS92314). [Online] Available: http://www.ti.com/lit/ds/symlink/tps92314.pdf
[8]
STMicroelectronics. 10W wide range high power factor isolated LED driver using HVLED815PF800. [Online]Available: http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/DM00092673.pdf
[9]
Fairchild Semiconductor. Fairchild reference designfor FL7732. [Online] Available: http://www.fairchildsemi.com/support/referencedesign/docs/RD-L026.pdf
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    Received: 26 December 2013 Revised: 19 March 2014 Online: Published: 01 August 2014

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      Weidong Nie, Zongguang Yu, Haibing Wang, Bin Guo, Long Teng, Lihang Yang. A PSR single-stage flyback LED driver with simple line regulation and quasi-resonant operation[J]. Journal of Semiconductors, 2014, 35(8): 085008. doi: 10.1088/1674-4926/35/8/085008 W D Nie, Z G Yu, H B Wang, B Guo, L Teng, L H Yang. A PSR single-stage flyback LED driver with simple line regulation and quasi-resonant operation[J]. J. Semicond., 2014, 35(8): 085008. doi: 10.1088/1674-4926/35/8/085008.Export: BibTex EndNote
      Citation:
      Weidong Nie, Zongguang Yu, Haibing Wang, Bin Guo, Long Teng, Lihang Yang. A PSR single-stage flyback LED driver with simple line regulation and quasi-resonant operation[J]. Journal of Semiconductors, 2014, 35(8): 085008. doi: 10.1088/1674-4926/35/8/085008

      W D Nie, Z G Yu, H B Wang, B Guo, L Teng, L H Yang. A PSR single-stage flyback LED driver with simple line regulation and quasi-resonant operation[J]. J. Semicond., 2014, 35(8): 085008. doi: 10.1088/1674-4926/35/8/085008.
      Export: BibTex EndNote

      A PSR single-stage flyback LED driver with simple line regulation and quasi-resonant operation

      doi: 10.1088/1674-4926/35/8/085008
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      • Corresponding author: Nie Weidong, Email:youdanwd@163.com
      • Received Date: 2013-12-26
      • Revised Date: 2014-03-19
      • Published Date: 2014-08-01

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