DC welding output
From primary inverter and rectifier stage.
AC/DC TIG board reference
WSE Secondary Inverter and Driver Board Reference
A board-level reference for WSE AC/DC TIG secondary inverter and secondary driver diagnosis.
Quick Answer
Use this page when a WSE AC/DC TIG machine has secondary inverter, secondary driver or AC output behavior that does not match the primary output stage.
- Separate primary DC output from secondary AC/DC polarity switching.
- Check secondary driver supply before replacing secondary inverter devices.
- For balance or pulse issues, confirm the control-panel command path.
Why WSE secondary-stage diagnosis is different
WSE AC/DC TIG machines add a secondary inverter stage and a secondary driver board after the primary inverter and rectifier stage. AC/DC mode faults can be caused by the secondary inverter, driver supply or control-panel mode command.
AC/DC TIG secondary stage
WSE secondary inverter and driver map
Separate primary output from the secondary AC/DC switching and driver stage.
Secondary inverter board
AC square-wave and polarity switching.
Secondary driver board
Isolated drive and AC20 V supply groups.
Control panel
AC/DC switch, pulse and balance command.
AC output missing
Check driver supply, inverter board and mode command.
Driver abnormal
Check secondary drive, auxiliary AC20 V and isolation.
Balance / pulse abnormal
Check control panel and mode signal path.
Secondary-stage evidence table
| Fault | Evidence layer | Direction |
|---|---|---|
| AC output missing | secondary inverter or driver command | check AC/DC switch, secondary drive, gate output and board supply. |
| DC works but AC abnormal | secondary inverter stage | separate primary output from secondary polarity-switching. |
| Driver board dead | auxiliary AC20 V groups and isolation | verify driver supply before blaming inverter devices. |
| Pulse / balance wrong | control panel and signal path | check front-panel command and secondary driver response. |