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Hi, I want to build a 15Kw DC motor driver. Is it possible to design five 3Kw half-bridge motor driver and connect them in parallel?
Are you talking about the CAS300 modules of post#9.In this module, they used a single MOSFET in each side
Whatever that means.Also, they mentioned to "Ease of paralleling" in their features
How do you know?without any additional elements
True.If you decide to use 5 ( or x number ) MOSFETS in parallel then make sure that the Peak Amps Rating of any one MOSFET can temporarily carry 100% FULL LOAD AMPS.
When turning ON ... the first MOSFET to turn ON will carry a huge load until every other MOSFET turns ON.
When turning OFF ... the last MOSFET to turn OFF will carry a huge load until it finally turns OFF.
In typical switching applications, source inductance is the limiting factor for switching speed and will almost perfectly balance the current rise and fall timing of parallel connected MOSFETs.If you decide to use 5 ( or x number ) MOSFETS in parallel then make sure that the Peak Amps Rating of any one MOSFET can temporarily carry 100% FULL LOAD AMPS.
When turning ON ... the first MOSFET to turn ON will carry a huge load until every other MOSFET turns ON.
When turning OFF ... the last MOSFET to turn OFF will carry a huge load until it finally turns OFF.
Delay skew is the parameter of interest. On the other hand, it's required to place the final driver near to the transistor. A possible solution may be a common driver with individual boosters, e.g. complementary common collector stages.I will parallel high current MOSFETs with single high source/sink current gate driver instead of paralleling multiple half-bridge modules with individual gate driver.