Driver reference · WSE AC/DC TIG

WSE secondary driver board reference

Use this page when a WSE AC/DC TIG welder has no AC output, AC output only in one direction, secondary inverter devices fail repeatedly, or gate drive appears missing in AC mode. The secondary driver board sits between the control signal and the polarity-switching output devices.

Driver board role

This page is for the secondary driver board

Use this page when the question is whether the secondary driver receives AC-mode enable, has isolated/local driver supply, outputs complementary gate signals, or prevents shoot-through. For the overall secondary inverter + driver relationship, use the relationship map 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.

Secondary driver role

Drive command input

Receives AC-mode timing, polarity and enable signals from the control board.

Auxiliary supply

Uses isolated or local auxiliary rails to power gate-drive circuits.

Gate-drive outputs

Feeds paired power devices for alternating output polarity.

Dead-time / interlock

Prevents opposing devices from conducting at the same time.

Fault isolation

A bad driver can destroy secondary inverter devices even if main inverter is healthy.

Feedback relation

Output feedback can disable driver if polarity/current behavior is abnormal.

Driver-side checks

Check	Normal meaning	Fault clue
AC-mode enable input	Driver receives permission to switch only in AC mode.	No enable: panel/control board path may be upstream fault.
Auxiliary driver supply	Driver IC/opto/transformer section has stable local power.	Missing supply: no gate outputs even when command is present.
Gate-pair balance	Opposite-polarity device gates receive complementary drive.	Only one side switches: AC output one direction only.
Dead-time protection	Prevents shoot-through across secondary inverter stage.	Repeated device failure or breaker trip in AC mode.
Output feedback	Driver/control reacts to abnormal output state.	AC starts and stops or falls into protection.

Driver board rule

Do not install replacement secondary inverter devices until the driver board has been checked for missing, one-sided or overlapping gate signals. Otherwise the same devices may fail again as soon as AC mode starts.