• The site will be going down for scheduled maintenance at 2PM GMT / 6AM PST Tuesday, Nov. 12 for approximately 30 minutes to perform some minor software updates.

UcD Tanaka Bridge LTspice simulation

Status
Not open for further replies.
Hello, I had great fun transforming the Sansui-Tanaka Full Balanced Bridge into a Class D UcD amp. Can somebody check the waveforms ?
 

Attachments

  • Sansui AUX701 - Tanaka Full Balanced Bridge.jpg
    Sansui AUX701 - Tanaka Full Balanced Bridge.jpg
    210.9 KB · Views: 301
  • UcD Tanaka Bridge (schema).JPG
    UcD Tanaka Bridge (schema).JPG
    81.5 KB · Views: 288
  • UcD Tanaka Bridge (simulation result).jpg
    UcD Tanaka Bridge (simulation result).jpg
    364.4 KB · Views: 279
  • UcD Tanaka Bridge (insufficient dead time issue).JPG
    UcD Tanaka Bridge (insufficient dead time issue).JPG
    215.3 KB · Views: 266
  • UcD Tanaka Bridge.zip
    UcD Tanaka Bridge.zip
    638.5 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!
 

Attachments

  • UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 420.GIF
    UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 420.GIF
    87.8 KB · Views: 95
  • UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 400.GIF
    UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 400.GIF
    88.6 KB · Views: 85
  • UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 380.GIF
    UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 380.GIF
    89.1 KB · Views: 80
  • UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 360.GIF
    UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 360.GIF
    91.6 KB · Views: 103
  • UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 340.GIF
    UcD Tanaka Bridge (5kHz .tran 0 405µ 205µ 100n) R109 R209 340.GIF
    89.4 KB · Views: 229
  • UcD Tanaka Bridge.zip
    UcD Tanaka Bridge.zip
    20.8 KB · Views: 77
Status
Not open for further replies.