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Journal of power electronics : JPE v.6 no.1, 2006년, pp.83 - 93  

A New High Efficiency and Low Profile On-Board DC/DC Converter for Digital Car Audio Amplifiers

Kim Chong-Eun    (Dept. of Electrical Engineering, KAIST   ); Han Sang-Kyoo    (School of Electrical Engineering, Kookmin University   ); Moon Gun-Woo    (Dept. of Electrical Engineering, KAIST  );
  • 초록

    A new high efficiency and low profile on-board DC/DC converter for digital car audio amplifiers is proposed. The proposed converter shows low conduction loss due to the low voltage stress of the secondary diodes, a lack of DC magnetizing current for the transformer, and a lack of stored energy in the transformer. Moreover, since the primary MOSFETs are turned-on under zero-voltage-switching (ZVS) conditions and the secondary diodes are turned-off under zero-current-switching (ZCS) conditions, the proposed converter has minimized switching losses. In addition, the input filter can be minimized due to a continuous input current, and an output inductor is absent in the proposed converter. Therefore, the proposed converter has the desired features, high efficiency and low profile, for a viable power supply for digital car audio amplifiers. A 60W industrial sample of the proposed converter has been implemented for digital car audio amplifiers with a measured efficiency of $88.3\%$ at nominal input voltage.


  • 주제어

    digital car audio amplifier .   DC/DC converter .   zero-voltage-switching .   zero-current-switching.  

  • 참고문헌 (5)

    1. B-H. Gwee, J. S. Chang, H. Li, 'A micropower low-distortion digital pulse width modulator for a digital class D amplifier,' IEEE Trans. Circuits and Systems II: Analog and Digital Signal Processing, Vol. 49, Issue 4, pp. 245-256, April, 2002 
    2. J. Zeng, J. Ying, Q. Zhang, 'A novel DC/DC ZVS converter for battery input application,' in Proc. IEEE APEC 2002, Vol. 2, pp. 892-896, March, 2002 
    3. N.-S. Jung, N.-I. Kim; G.-H. Cho, 'A new high-efficiency and super-fidelity analog audio amplifier with the aid of digital switching amplifier: class K amplifier,' in Proc. IEEE PESC 1998, Vol. 1, pp. 457 - 463, May, 1998 
    4. H. Watanabe, H. Matsuo, 'A novel high-efficient DC-DC converter with 1V/20A DC output,' in Proc. IEEE INTELEC 2002, pp. 34-39, Sept.-Oct., 2002 
    5. N.-I. Kim, S.-H. Jung, J.-Y. Ryoo, G.-H. Cho, 'Ripple feedback filter suitable for analog/digital mixed-mode audio amplifier for improved efficiency and stability,' in Proc. IEEE PESC 2002, Vol. 1, pp. 45-49, June, 2002 

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  • Han, Sang-Kyoo (32)

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