The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Slope Compensation Design of Buck AC/DC LED Driver Based on Discrete-Time Domain Analysis

이산 시간 영역 해석에 기반한 벅 AC/DC LED 구동기의 슬로프 보상 설계

  • Kim, Marn-Go (Dept. of Control & Instrumentation Engineering, Pukyong National University)
  • Received : 2018.10.03
  • Accepted : 2018.12.26
  • Published : 2019.06.20
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Abstract

In this study, discrete-time domain analysis is proposed to investigate the input current of a buck AC/DC light-emitting diode (LED) driver. The buck power factor correction converter can operate in both discontinuous conduction mode (DCM) and continuous conduction mode (CCM). Two discontinuous and two continuous conduction operating modes are possible depending on which event terminates the conduction of the main switch in a switching cycle. All four operating modes are considered in the discrete-time domain analysis. The peak current-mode control with slope compensation is used to design a low-cost AC/DC LED driver. A slope compensation design of the buck AC/DC LED driver is described on the basis of a discrete-time domain analysis. Experimental results are presented to confirm the usefulness of the proposed analysis.

Keywords

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Fig. 1. Constant-frequency buck derived AC/DC LED driver.

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Fig. 2. Input voltage and inductor current waveforms of Fig. 1.

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Fig. 3. Operating modes of inductor current. (a) CCM1, (b) DCM1, (c) CCM2, (d) DCM2.

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Fig. 4. Analytical current waveforms when Vm = 310 V, fL = 60 Hz, Vo = 70 V, LED current = 0.6 A, Sro = 7, L = 1.5 mH, and fs = 100 kHz. (a) inductor current, (b) input current.

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Fig. 5. Slope ratio Sro versus PF when fL = 60 Hz, Vo =70 V, LED current =0.6 A, L = 1.5 mH, and fs = 100 kHz.

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Fig. 6. Experimental circuit (a) and Control IC (b).

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Fig. 7. External ramp signal OSC of CS3842 in the experiment.

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Fig. 8. Experimental input current waveforms as a function of the input voltage, (a) Vm/ $\sqrt[]{2}$=100 V (PF=0.933), (b) Vm/ $\sqrt[]{2}$=110 V (PF=0.952), (c) Vm/ $\sqrt[]{2}$=130 V (PF=0.970), (d) Vm/ $\sqrt[]{2}$=150 V (PF=0.977), (e) Vm/ $\sqrt[]{2}$=220 V (PF=0.981), (f) Vm/ $\sqrt[]{2}$=240 V (PF=0.976). Horizontal scale: 2 ms/div.

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Fig. 9. Input voltage versus PF for Sro = 7.

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Fig. 10. Input voltage versus measured efficiency (Vo ≈ 70 V, Po ≈ 42 W).

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Fig. 11. Start-up transient response.

TABLE I COMPONENTS AND PARAMETERS OF PROTOTYPE CONVERTER

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