Optimal Trajectory Control of Burst Mode for LLC Resonant Converter

Feng, Weiyi; Lee, F. C.; Mattavelli, Paolo

doi:10.1109/tpel.2012.2200110

Cited by 193 publications

(44 citation statements)

References 10 publications

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“…In [31], it was further proposed that the on time of the first pulse can be optimized to limit the charging time of the first pulse. The objective is to avoid the shrinking current in the resonant tank, therefore improve the efficiency and also minimize the output voltage ripple.…”

Section: B Burst-mode Llc Implemented By Vppmmentioning

confidence: 99%

Burst-Mode Resonant LLC Converter for an LED Luminaire With Integrated Visible Light Communication for Smart Buildings

Zhao

Trescases

2014

IEEE Trans. Power Electron.

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This study presents a digitally controlled LLC resonant dc-dc converter targeted to white LED luminaires in smart buildings. The module uses the LED array both for ambient lighting and for transmitting sensor data. Visible light communication is implemented with minimal incremental cost, by operating the LLC converter in burst mode, without causing any visible disturbance. The converter operates with a regulated average LED current, while the burst pulse timing is controlled to minimize the current disturbance and reduce the output capacitance. Variable pulse position modulation is used to modulate the data, while supporting a range of dimming settings. A digital demodulation scheme that supports variable frequency transmission is demonstrated. The 80 W, 340-400 to 23 V converter prototype has an efficiency of 95.1%. The bit error rate of the complete system is fully characterized versus distance and angle.

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Section: B Burst-mode Llc Implemented By Vppmmentioning

confidence: 99%

Burst-Mode Resonant LLC Converter for an LED Luminaire With Integrated Visible Light Communication for Smart Buildings

Zhao

Trescases

2014

IEEE Trans. Power Electron.

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“…However, i Lr is shrinking during the burst-on time as shown in Fig. 2 [14], [15]. The higher RMS value of shrinking i Lr offsets the benefit from burst-mode control.…”

Section: Introductionmentioning

confidence: 96%

“…The initial condition of a resonant tank is uncertain if driving signals did not set the initial values of i Lr and v Cr . There are different pulse patterns in some research results[14]-Error! Reference source not found.5].…”

mentioning

confidence: 99%

LLC resonant converter controller with novel light load control

Yang

Liang

Chen

et al. 2014

2014 International Power Electronics and Application Conference and Exposition

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LLC resonant converter is an attractive topology to achieve high power density with high efficiency. However, the high switching frequency and circulating current result the poor efficiency of a LLC resonant converter under light load condition. To improve efficiency further, a modified burst-mode control is implemented in the proposed controller. The switching frequency decreases gradually during burst-on time to reduce the number of switching cycles under the same output ripple. Moreover, in burston time, the first pulse drives the MOSFET at high side with limited pulse width to suppress the initial current in resonant tank. The last switching cycle in burst-on time must be complete to ensure that initial conditions of each burst cycle are the same. Consequently, the switching losses are reduced, and light-load efficiency is improved.Index Terms------LLC resonant converter, burst-mode control, switching losses.

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“…The lower the load current, the longer the inactive period and, hence, the lower the equivalent switching frequency. This principle has also been applied to improve the light-load efficiency of resonant DC/DC converters [14]. Two techniques have been proposed to control the burst in active period [15]: (i) constant duty cycle [13]; and (ii) constant average (or peak) inductor current [16], which has been applied in many commercial DC/DC converters such as TPS6120x, LT1303, L6920 and STBB1-AXX.…”

Section: Introductionmentioning

confidence: 99%

Optimal Inductor Current in Boost DC/DC Converters Operating in Burst Mode Under Light-Load Conditions

Reverter

Gasulla

2016

IEEE Trans. Power Electron.

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Abstract-This letter analyses how the efficiency of boost DC/DC converters operating in burst mode under light-load conditions can be improved by an appropriate selection of the inductor current that transfers energy from the input to the output. A theoretical analysis evaluates the main power losses (fixed, conduction and switching losses) involved in such converters and how do they depend on the inductor current. This analysis shows that there is an optimal value of this current that causes minimum losses and, hence, maximum efficiency. These theoretical predictions are then compared with experimental data resulting from a commercial boost DC/DC converter (TPS61252) whose average inductor current is adjustable. Experimental results show that the use of the optimal inductor current, which was around 340 mA for an output voltage of 5 V, provides an efficiency increase of 7%.

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Optimal Trajectory Control of Burst Mode for LLC Resonant Converter

Cited by 193 publications

References 10 publications

Burst-Mode Resonant LLC Converter for an LED Luminaire With Integrated Visible Light Communication for Smart Buildings

Burst-Mode Resonant LLC Converter for an LED Luminaire With Integrated Visible Light Communication for Smart Buildings

LLC resonant converter controller with novel light load control

Optimal Inductor Current in Boost DC/DC Converters Operating in Burst Mode Under Light-Load Conditions

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