“ACPL-337J is an advanced and highly integrated gate drive optocoupler designed to isolate, drive, protect and feedback the working state of IGBTs.
ACPL-337J is an advanced and highly integrated gate drive optocoupler designed to isolate, drive, protect and feedback the working state of IGBTs.
It has rail-to-rail output, can provide a maximum current of 4A, and can directly drive high-power IGBTs. The integrated DESAT detection protects the IGBT in the event of a short circuit, and the isolated feedback reports this fault to the controller.
In addition to these basic functions, ACPL-337J also integrates more new functions to further reduce the external discrete components used by designers, thereby improving the overall power efficiency and reliability of the system. The end result is an easy-to-use, compact and affordable IGBT gate drive optocoupler solution.
Functional diagram of ACPL-337J gate drive optocoupler
At the beginning
Optocouplers are used to provide high-voltage enhanced electrical insulation and noise isolation in inverter or motor drive applications. Gate drive optocouplers that can usually provide high output current are usually used to charge and discharge the gate capacitance of IGBTs. To turn the IGBT on or off. soon. When driving higher power IGBTs, current buffers are sometimes used.
The IGBT desaturation detection circuit is composed of discrete components such as a voltage comparator, a constant current source and a transistor switch, which can protect the expensive IGBT during a short-circuit fault. The fault will provide feedback to the low-voltage controller through another electrically isolated path (usually a digital optocoupler).
The basic gate driver optocoupler and discrete components can isolate, drive, protect and feedback the operating state of the IGBT
Avago Technologies first integrated a complete gate drive solution,
To isolate, drive, protect and provide feedback to HCPL-316J.of
HCPL-316J is RST 2.5A gate drive optocoupler with integrated DESAT
(Desaturation) Detect and isolate fault feedback.
HCPL-316J, 2.5A gate drive optocoupler, with integrated DESAT detection and isolated FAULT feedback
In order to further maximize design flexibility, HCPL-316J also has an undervoltage lockout (UVLO) function to prevent the gate voltage from being insufficient to drive the IGBT and “soft” IGBT turn-off to prevent high-voltage steering or transient stress on the IGBT.