Hello, I had great fun transforming the Sansui-Tanaka Full Balanced Bridge into a Class D UcD amp. Can somebody check the waveforms ?
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Sansui AUX701 - Tanaka Full Balanced Bridge.jpg210.9 KB · Views: 301
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UcD Tanaka Bridge (schema).JPG81.5 KB · Views: 288
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UcD Tanaka Bridge (simulation result).jpg364.4 KB · Views: 279
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UcD Tanaka Bridge (insufficient dead time issue).JPG215.3 KB · Views: 266
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UcD Tanaka Bridge.zip638.5 KB · Views: 112
As suggested by Tekko in the "UcD Philips UM10155 LTspice simulation" thread, I played with the value of R9 (R109 and R209 here) for controlling the deadtime.
Here are the results:
R109 and R 209 (ohm)...Spikes.............................THD at 5kHz (%)
340............................Twice the AVG current........0.048
360............................Same as the AVG current.....0.042
380............................Acceptable......................0.092
400............................Barely noticeable...............0.092
420............................Past barely noticeable........0.152
See attached pictures and .zip
Thanks Tekko!
Here are the results:
R109 and R 209 (ohm)...Spikes.............................THD at 5kHz (%)
340............................Twice the AVG current........0.048
360............................Same as the AVG current.....0.042
380............................Acceptable......................0.092
400............................Barely noticeable...............0.092
420............................Past barely noticeable........0.152
See attached pictures and .zip
Thanks Tekko!
Attachments
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UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 420.GIF87.8 KB · Views: 95
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UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 400.GIF88.6 KB · Views: 85
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UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 380.GIF89.1 KB · Views: 80
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UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 360.GIF91.6 KB · Views: 103
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UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 340.GIF89.4 KB · Views: 229
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UcD Tanaka Bridge.zip20.8 KB · Views: 77
Hello, I wonder if you ever builded this design and/or if you have any suggestion for the 3mA biasing?
Best regards
Best regards
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