Voltage Doubler Rectified Boost-Integrated Half Bridge (VDRBHB) Converter for Digital Car Audio Amplifiers

A new voltage doubler rectified boost-integrated half bridge converter for digital car audio amplifiers is proposed. The proposed converter shows low conduction loss due to low voltage stress of the secondary diodes, no 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 conditions and the secondary diodes are turned-off under zero current switching 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 filter does not need an inductor in the proposed converter. Therefore, the proposed converter has the desired features, high efficiency and low profile, for a viable power supplies for digital car audio amplifiers. A 60-W 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.

[1]  Gyu-Hyeong Cho,et al.  A new high-efficiency and super-fidelity analog audio amplifier with the aid of digital switching amplifier: class K amplifier , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[2]  Simon S. Ang,et al.  A multi-loop voltage feedback filterless class-D switching audio amplifier using unipolar pulse-width-modulation , 2004, IEEE Transactions on Consumer Electronics.

[3]  Gyu-Hyeong Cho,et al.  Ripple feedback filter suitable for analog/digital mixed-mode audio amplifier for improved efficiency and stability , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[4]  K. M. Smedley,et al.  A low distortion switching audio power amplifier , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[5]  Bah-Hwee Gwee,et al.  A micropower low-distortion digital pulsewidth modulator for a digital class D amplifier , 2002 .

[6]  A.J.M. van Tuijl,et al.  A power efficient audio amplifier combining switching and linear techniques , 1998, Proceedings of the 24th European Solid-State Circuits Conference.

[7]  Jianhong Zeng,et al.  A novel DC/DC ZVS converter for battery input application , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[8]  H. Watanabe,et al.  A novel high-efficient DC-DC converter with 1V/20A DC output , 2002, 24th Annual International Telecommunications Energy Conference.

[9]  G. H. Cho,et al.  New power active filter with simple low cost structure without tuned filters , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[10]  Edelmoser,et al.  High Dynamic Class-D Power Amplifier , 1997, 1997 International Conference on Consumer Electronics.