Falla

IGBT / MOSFET se quema repetidamente

Repeated etapa de potencia failure diagnóstico: driver forma de onda, snubber, transformador y rectificador secundario.

Why repeated device failure happens

Repeated IGBT o MOSFET failure is usually a síntoma, not the original cause. New potencia devices can fail immediately if the driver de compuerta, snubber, transformador, rectificador secundario o PWM timing remains abnormal.

Safe diagnóstico path

Remove / isolate damaged devices

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Comprobación compuerta resistencias y driver salidas

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Comprobación snubber network

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Comprobación transformador y secondary shorts

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Verify PWM timing con current limiting

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Install new devices

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Potencia up gradually

Comprobaciones

Comprobación	Normal / valor esperado	Significado si es anormal
compuerta resistencia	Correct value, not open	Uneven o missing drive
Driver forma de onda	Balanced y clean	Shoot-through o no switching
Snubber	No short/open	Voltage spikes destroy devices
Main transformador	No shorted winding	Excess current
Rectificador secundario	Not shorted	Primary overload
PWM timing	No overlap	Shoot-through risk

Repair principle

Do not install expensive potencia devices until the low-potencia forma de onda de disparo y downstream load condition are verified.

ZX7-250 lesson connection

Lesson-based IGBT replacement warning: verify driver chain before full-power testing. — Lesson-based IGBT replacement warning: verify cadena driver before full-potencia testing.

The ZX7-250 lesson strengthens this falla page because it shows the correct order after a tubo de potencia short: use a limitador con lámpara, isolate the shorted H7B/tubo de potencia, verify that the control side still responds, then inspect the cadena driver before installing a new device.

Potencia tube short found

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Do not replace y fully potencia immediately

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Comprobación rieles de control

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Comprobación driver salida y compuerta path

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Only then install y retest