TRIAC Blows Off in Single-Phase Induction Motor Capacitor Switching Circuit

K

KAMAL ZINZUVADIYA

enter image description here (Q2 is not populated)I am working on a circuit involving a single-phase induction motor that uses a starting capacitor. The capacitor is supposed to be connected during the motor startup and then disconnected once the motor reaches a certain speed. However, I am facing an issue where the TRIAC blows off when trying to perform this operation.

Circuit Details: Motor Type: Single-phase induction motor Capacitor Configuration: Starting capacitor connected and disconnected for motor start operation Components Involved: TRIAC: BTA41600B Optocoupler: MOC3061 Gate Resistance: Approximately 360 ohms Snubber Circuit: 39 ohm resistor and 0.01uF 1000V capacitor Problem: The TRIAC blows off when the starting capacitor should disconnect from the circuit. The issue seems to be related to the transient behavior during the switching process.

Observations: The problem occurs specifically during the transition phase of the capacitor disconnection. The motor runs fine initially but once the TRIAC attempts to disconnect the capacitor, it fails. Questions: What could be causing the TRIAC to blow off in this scenario? Are there any specific protections or snubber circuits I should consider to handle the transients caused by disconnecting the starting capacitor? Could there be any issues related to the timing of the TRIAC switching that I should investigate? Are there any recommended practices for designing such circuits to ensure reliable operation? I would appreciate any insights or suggestions on how to resolve this issue.

Thank you!
 

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Deals: refurbished iPhone 15 models, Galaxy S24 series discounts and foldables​


Peter 15 September 2024

Deals


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Возможно ли реализовать это на WinForms? Если да - подскажите, какие контролы для этого подойдут. Заранее спасибо! P.S. На скрине изобразил, как это примерно может выглядеть. Пример
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