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Søren Poulsen, Ørsted·DTU, Automation Technical University of Denmark NORPIE 20041 Integrating switch mode audio power amplifiers and.

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Presentation on theme: "Søren Poulsen, Ørsted·DTU, Automation Technical University of Denmark NORPIE 20041 Integrating switch mode audio power amplifiers and."— Presentation transcript:

1 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20041 Integrating switch mode audio power amplifiers and electro dynamic loudspeakers for a higher power efficiency Søren Poulsen Ph.D. Student Ørsted·DTU Technical University of Denmark spo@oersted.dtu.dk Michael A. E. Andersen Professor Ørsted·DTU Technical University of Denmark ma@oersted.dtu.dk

2 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20042 Integrating switch mode audio amplifier and loudspeaker •Using the voice coil inductance as output filter

3 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20043 Loudspeaker impedance •Maximum phase shift ~ 65° –Reral part caused by eddy current losses in the magnetic system •Resonances at high frequencies –Voice coil inductance –Voice coil capacitance

4 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20044 PWM modulation shemes 2-level modulation 3-level modulation

5 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20045 PWM HF output spectra 2-level modulation 3-level modulation M=0.01 M=1

6 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20046 Pushing up voice coil resonance frequency •Minimizing L·C –L  N 2 –C  1/number of layers •Fewer turns •More winding layers

7 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20047 Pushing up ressonance frequency •Layer to layer capacity

8 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20048 Voice coil fill factor

9 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 20049 Efficiency improvement with low impedance voice coils •Efficiency constant for same fill-factor •Higher fill factor benefits efficiency

10 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200410 Power stage losses, 2-level modulation •Output stage losses •Using same DIE area and voice coil fill factor for different supply voltages •Ripple current included Single ended and full bridge output stage 5V, 10V, 20V, 40V supply

11 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200411 Improving the magnetic system •Modifying magnetic system with other materials near the voice coil •Ferrite –Exellent HF properties –Bmax  0,5T •Powder iron –Exellent HF properties –Bmax  1-1,4T

12 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200412 Prototype magnetic system, FEM simulation -26 iron powder material used

13 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200413 Standard magnetic system Blue: Above gap Green: In gap Red: Below gap

14 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200414 Prototype magnetic system Blue: Above gap Green: In gap Red: Below gap

15 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200415 Standard and prototype magnetic system Blue: Prototype system Green: Std. system

16 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200416 Magnetic system power loss, 2-level modulation Blue: M=0Green: M=0.25Red: M=0.5 Magenta: M=0.75Orange: M=1

17 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200417 Magnetic system power loss, 3-level modulation Green: M=0.25Red: M=0.5 Magenta: M=0.75Orange: M=1

18 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200418 Audio quality •Listening tests carried out –Dual blind test •No prove of sound degradation

19 Søren Poulsen, spo@oersted.dtu.dk Ørsted·DTU, Automation Technical University of Denmark NORPIE 200419 Conclusion •Using the voice coil inductance as output filter for the amplifier possible •Eddy current losses in the magnetic system can be reduced significantly •Higher voice coil fill factor possible •Dedication favours low impedance interface •Significant improvement of power efficiency

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