APWM adapted half-bridge LLC converter with voltage doubler rectifier for improving light load efficiency

APWM adapted half-bridge LLC converter with voltage doubler rectifier for improving light load efficiency

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LLC converter is widely used in various applications due to its simple structure and zero voltage switching capability. To achieve high efficiency, LLC converter is usually designed to operate near the resonant frequency over the entire load conditions. However, a constant core loss of the main transformer due to the constant frequency operation has a bad effect on the efficiency in a light load condition where the core loss dominates the total loss. Therefore, it is essential to reduce transformer core loss in order to improve light load efficiency. Adapting asymmetric pulse-width modulation (APWM) in a half-bridge LLC resonant converter with voltage doubler rectifier for improving light load efficiency has been proposed. By adapting APWM, the core loss can be reduced dramatically in the light load condition, because both the switching frequency and the flux swing of the transformer are reduced. Furthermore, the proposed method does not affect the design of the converter. The experimental results with 400–250 V input and 100 V/2 A output prototype converter support the effectiveness of the proposed method.


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      • 1. Kim, J.-H., Kim, C.-E., Kim, J.-K., Lee, J.-B., Moon, G.-W.: ‘Analysis on load-adaptive phase-shift control for high efficiency full-bridge LLC resonant converter under light-load conditions’, IEEE Trans. Power Electron., 2016, 31, (7), pp. 49424955, doi: 10.1109/TPEL.2015.2462077.
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      • 2. McDonald, B., Wang, F.: ‘LLC performance enhancements with frequency and phase shift modulation control’. 2014 IEEE Applied Power Electronics Conf. and Exposition – APEC 2014, Texas, USA, March 2014, pp. 20362040, doi: 10.1109/APEC.2014.6803586.
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      • 3. Kim, B.-C., Park, K.-B., Moon, G.-W.: ‘Asymmetric PWM control scheme during hold-up time for LLC resonant converter’, IEEE Trans. Power Electron., 2012, 59, (7), pp. 29922997, doi: 10.1109/TIE.2011.2166237.
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