Is there any quality difference between products made in Japan and those made overseas?

Fuji Electric Corp. of America enforces the same quality standard for product management at all locations, regardless of where the manufacturing sites are.

Where are Fuji semiconductor products manufactured?

The semiconductor products of Fuji Electric Corp. of America are manufactured at its six sites in Japan (including Matsumoto Factory, Yamanashi Factory, Fuji Electric Power Semiconductor Co., Ltd., and Fuji Electric Tsugaru Semiconductor Co., Ltd.), and three overseas sites (Fuji Electric (ShenZhen) Co., Ltd., Fuji Electric Philippines, Inc., and Fuji Electric (Malaysia) Sdn. Bhd.).

What precautions do I need to be aware of when connecting IGBT modules in parallel?

There are four basic precautions, shown below, when connecting IGBT modules in parallel: (1) Current unbalance control during steady operation (2) Current unbalance control at the time of switching (3) Gate drive circuit (4) Derating For details, refer to Application Manual Chapter 4-3.5 and Chapter 8.

Can IGBT modules be used in parallel?

Some IGBT module models can be connected in parallel, while other models cannot. Please contact Fuji Electric Corp. of America or your local sales representative or distributor to answer your question.

How do I mount a module?

Refer to IGBT module’s Application Manual Chapter 6-3 or Mounting Instruction.

How is the capacitor C of the snubber circuit to be determined?

The necessary capacity for a snubber capacitor can be obtained with the following formula. For details, refer to Application Manual Chapter 5.

What types of snubber circuit are available?

There are two types of snubber circuits. The first type is implemented between the DC power supply busbars and is called lump snubber. The second type is called individual snubber ciruit and is connected to each IGBT. For details, refer to Application Manual Chapter 5.

Does Cies show temperature dependence?

There is no dependency.

Does QG show temperature dependence?

There is no dependency.

How can we confirm the dead-time?

One way to determine the validity of the dead-time setting is to verify the current on the direct current power line during non-loading time. For details, refer to Application Manual Chapter 7.