Drain-Voltage Balance and Phase-Shifted PWM Control Schemes for High-Efficiency Parallel-String Dimmable LED Drivers

Liu, Pang-Jung; Hsu, Yu-Chi; Hsu, Shang-Ru

doi:10.1109/tie.2018.2793220

Cited by 18 publications

(17 citation statements)

References 20 publications

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“…According to the resonant components L r1 , C r1 , R ac1, and L m1 , the voltage gain of the presented resonant converter is derived in (8).…”

Section: Circuit Analysis and Design Proceduresmentioning

confidence: 99%

“…The main drawback of GaN power devices is high cost compared to power MOSFETs. For the past twenty years, the quasi-resonant (QR) flyback converter [1,2] with low turn-on switching loss, the active clamp dc/dc converters [3] with zero voltage switching operation, the resonant converters [4][5][6] with soft switching operation on power semiconductors, and pulse width modulation (PWM) converters [7][8][9] have been developed to implement high efficiency converters with power MOSFETs devices. QR flyback [1,2] is limited at low power applications, and active clamp dc/dc converters [3] have the problems of dc magnetizing current and unbalance voltage and current stresses on the rectifier diodes.…”

Section: Introductionmentioning

confidence: 99%

“…For conventional resonant converters [4][5][6], the input voltage variation is limited due to the limited available voltage gain on the resonant tank. Conventional phase-shift PWM full bridge converters [7][8][9] have drawbacks of hard switching loss at light or low load condition, and high freewheeling current at low load or high input voltage condition. For solar photovoltaic systems, the output voltage of a solar panel is relative to geographical location and solar intensity, so that the solar cell panel has wide output voltage range.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Implementation of a Parallel-Series Resonant Converter with Wide Input Voltage Range

Lin¹

2019

Energies

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A new resonant converter is presented to have the advantages of soft switching operation on power devices, without reverse recovery current loss on power diodes and wide input voltage range operation. Resonant converter with frequency modulation is adopted in the proposed circuit to accomplish the low switching loss on power switches and possible zero current switching operation on fast recovery diodes. To improve the problem of limit voltage range operation in the conventional resonant converter, a new parallel-series structure resonant converter is studied to achieve wide input voltage operation capability, such as from Vin,min to 4Vin,min. A 1.8 kW laboratory circuit is implemented, and the measured results are provided to confirm the theoretical analysis and circuit performance.

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“…According to the resonant components L r1 , C r1 , R ac1, and L m1 , the voltage gain of the presented resonant converter is derived in (8).…”

Section: Circuit Analysis and Design Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Implementation of a Parallel-Series Resonant Converter with Wide Input Voltage Range

Lin¹

2019

Energies

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“…More components are needed in the circuit, and these additional components introduce more power loss. For medium-power products, resonant converters [4][5][6][7] and full-bridge pulse width modulation converters [8][9][10][11] were developed to reduce switching losses. Full-bridge converters lose soft switching operation at low output power and the circuit efficiency will decrease at low load conditions.…”

Section: Introductionmentioning

confidence: 99%

Resonant Converter with Soft Switching and Wide Voltage Operation

Lin

2019

Energies

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A new DC/DC resonant converter with wide output voltage range operation is presented and studied to have the benefits of low switching losses on active devices and low voltage stresses on power diodes. To overcome serious reverse recovery losses of power diodes on a conventional full-bridge pulse-width modulation converter, the resonant converter is adopted to reduce the switching loss and increase the circuit efficiency. To extend the output voltage range in conventional half-bridge or full-bridge resonant converters, the secondary sides of two diode rectifiers are connected in series to have wide output voltage operation. The proposed converter can be either operated at one-resonant-converter mode for low voltage range or two-resonant-converter mode for high voltage range. Thus, the voltage rating of power diodes is decreased. Experiments with the design example are given to show the circuit performance and validate the theoretical discussion and analysis.

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“…High power density and high circuit efficiency are demanded of modern powered electronics in order to reduce the greenhouse effect. Power converters with soft switching characteristics, such as asymmetric pulse-width modulation converters [1][2][3][4] and phase-shift pulse-width modulation converters [5][6][7][8], have been developed and implemented to improve converter efficiency. The main drawback of these circuit topologies is a narrow soft switching range due to the limited energy stored on the leakage inductor under light or low load.…”

Section: Introductionmentioning

confidence: 99%

Resonant Converter with Voltage-Doubler Rectifier or Full-Bridge Rectifier for Wide-Output Voltage and High-Power Applications

Lin

Jian³

2018

Electronics

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This paper presents a resonant converter with the benefits of wide output voltage, wide soft switching characteristics for power devices and high circuit efficiency. Since the series resonant circuit is adopted on the primary side, the power switches are turned on under zero voltage switching and power diodes on the secondary side can be turned off under zero current switching. To overcome the drawback of narrow voltage operation range in the conventional resonant converter, full-bridge rectifier and voltage-doubler rectifier topologies are employed on the secondary side for low-voltage output and high-voltage output applications. Therefore, the voltage rating of power devices on the secondary side is clamped at output voltage, rather than two times output voltage, in the center-tapped rectifier circuit. Synchronous power switches are used on the secondary side to further reduce the conduction losses so that the circuit efficiency can be further improved. To verify the theoretical analysis and circuit performance, a laboratory prototype with 1 kW rated power was built and tested.2 of 16 needed for EV and HEV applications or outdoor LED lighting systems with variable series or parallel combinations of LED strings. There are several solutions to overcome the challenges of wide input or output voltage range operation. First, the conventional full-bridge converter, as shown in Figure 1a, with wide duty cycle control can be adopted to achieve wide voltage operation. If the maximum duty cycle is four times the minimum duty cycle (d max = 4 d min ), then the output voltage of full-bridge converter is controlled at the constant value for 4:1 input voltage range (v max = 4 v min ). However, wide duty cycle operation will result in low circuit efficiency in cases of high input voltage and low duty cycle. The second solution to achieve wide voltage operation is using two-stage dc-dc converters, as shown in Figure 1b, such as buck or boost circuit and full-bridge circuit. Since two-stage circuits are used, the circuit efficiency is decreased and the circuit reliability is also reduced. The third solution is using single stage hybrid resonant circuit topology [12][13][14] as shown in Figure 1c. The wide voltage range resonant converter with full-bridge circuit (S 1~S4 are operation) or half-bridge (S 1 , S 2 and S 3 are operation) circuit topology used on the primary side [13,14] has been proposed to extend the input voltage range. The main advantage of the full-bridge and half-bridge resonant converter on the primary side is the wide input voltage range (v in,max = 4 v in,min ). However, there is a transient duration between the half-bridge resonant converter and the full-bridge resonant converter operation, and one power switch S 3 is always in the on-state under half-bridge resonant circuit, which will result in one more conduction loss on a powered device. The secondary side of the circuit topologies in Figure 1 is the center-tapped rectified circuit with two diodes to obtain low voltage output. If a wide output voltage i...

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Drain-Voltage Balance and Phase-Shifted PWM Control Schemes for High-Efficiency Parallel-String Dimmable LED Drivers

Cited by 18 publications

References 20 publications

Implementation of a Parallel-Series Resonant Converter with Wide Input Voltage Range

Implementation of a Parallel-Series Resonant Converter with Wide Input Voltage Range

Resonant Converter with Soft Switching and Wide Voltage Operation

Resonant Converter with Voltage-Doubler Rectifier or Full-Bridge Rectifier for Wide-Output Voltage and High-Power Applications

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