Hybrid Circuits Simplify IGBT Module Gate Drive （混合电路简化门驱动IGBT模块）.pdf

Hybrid Circuits Simplify IGBT Module Gate Drive Eric R. Motto Powerex Inc., Youngwood, Pennsylvania, USA Abstract: This paper will review the typical gate drive requirements for the latest generation of high power IGBT modules and present simplified implementations of the required circuits using newly developed hybrid integrated circuit (HIC) building blocks. A newly developed circuit that provides short circuit protection without desaturation detection will also be presented. I. INTRODUCTION In high power IGBT module applications it is usually desirable to use completely isolated gate drive circuits. A typical implementation of this type of gate drive is shown in figure 1. This circuit provides isolation of logic level control and fault feedback signals using optocouplers and separate isolated power supplies for each gate driver. There are a number of advantages to this topology including: (1) Stable on and off drive driving voltages that are independent of the power device switching duty. (2) Capable of providing very high output currents for large IGBT modules. (3) Power circuit switching noise and high voltages are isolated from control circuits. (4) Local power is available for protection circuits such as desaturation detectiont. The main Isolated DC Power disadvantages of th