Home / Circuits / WSE secondary inverter driver path

Circuit path · WSE AC/DC output

WSE secondary inverter and driver signal path

This page maps the WSE AC/DC TIG signal path from panel AC command to secondary driver, polarity-switching power devices, AC balance control, output feedback and protection. It explains why DC output can be normal while AC TIG output is missing or one-sided.

Relationship map

This page is not the same as the dedicated driver-board page

This page explains the relationship between the secondary inverter stage, secondary driver board, AC/DC command, auxiliary supply, rectifier/output path and feedback. For board-level gate-drive checks, use the dedicated secondary driver board page. For polarity-switching power devices, use the secondary inverter board page.

Which WSE AC/DC TIG page should you use?

These pages are intentionally separate. Use the relationship map for system-level orientation, the driver-board page for gate-drive evidence, the inverter-board page for AC polarity power switching, and the diagnostic route when starting from a field symptom.

Relationship mapExplains how AC/DC command, auxiliary supply, secondary driver, secondary inverter and feedback work together. Secondary driver boardUse for isolated driver supply, gate-pair outputs, dead-time, interlock and one-sided gate-drive faults. Secondary inverter boardUse for AC polarity switching devices, balance behavior, AC-only failure and secondary power-stage checks. AC/DC fault routeUse when DC mode works but AC fails, AC output is one-sided, or secondary devices fail repeatedly.

Signal path map

Panel AC commandAC/DC switch and balance controls generate mode request.
Control board logicConverts panel commands into AC timing and enable signals.
Secondary driverProduces isolated complementary drive for polarity devices.
Secondary inverterSwitches output polarity for AC TIG waveform.
Output pathArc receives alternating polarity and cleaning/penetration balance.
Feedback/protectionAbnormal waveform or current state can block drive.

One-sided AC waveform interpretation

If AC TIG sounds like switching but the output only appears in one polarity or cleaning action is missing, the fault may be in one driver output pair, one secondary power-device leg, the balance command, or feedback that disables part of the cycle.

ClueLikely boundaryCheck
Only one polarity conductsDriver pair or secondary legCompare gate signals and power-device continuity side by side.
AC mode silent/no switchAC command or driver enableCheck panel AC/DC command and driver supply.
AC starts then shuts downFeedback or protectionCheck output feedback and secondary over-current evidence.
Balance has no effectPanel balance or timing logicCheck balance signal change and driver timing response.
Secondary devices fail repeatedlyGate timing/dead-time/snubberCheck driver overlap and snubber components before re-powering.

WSE diagnosis principle

AC/DC TIG diagnosis must compare DC mode, AC mode, panel command and secondary switching. A normal DC weld does not prove the secondary inverter and driver are healthy.

Related WSE AC/DC TIG secondary inverter repair references

Use these links to move between symptom diagnosis, board-level evidence, circuit paths and component or chip checks for the same repair family.

Diagnostic routes

Boards and circuit paths

Components and chips

  • No dedicated page yet.