Simple Igbt Gate Driver Circuit

In essence a gate driver consists of a level shifter in combination with an amplifier.

Simple igbt gate driver circuit.

Based on the basic construction of the insulated gate bipolar transistor a simple igbt driver circuit is designed using pnp and npn transistors jfet osfet that is given in the below figure. Igbt and mosfet gate drive models the figure below shows the simple driver with one output pin driving the gate of a mosfet through the gate resistor rg. The insulated gate bipolar transistor hereinafter referred to as igbt is a composite device of mosfet and gtr. A gate driver is a power amplifier that accepts a low power input from a controller ic and produces a high current drive input for the gate of a high power transistor such as an igbt or power mosfet gate drivers can be provided either on chip or as a discrete module.

For wide duty cycle applications such as buck converters it doesn t provide adequate gate drive voltage and thus a dc restoration circuit has to be added on the secondary side of the transformer capacitor and diode coupling capacitor voltage increases with duty ratio increase and also. Thus it has the advantages of mosfet including fast operation speed high switching frequency high input impedance simple drive circuit and good thermal temperature. It is often helpful to consider the gate as a simple capacitor when discussing drive circuits. A special section deals with the gate drive requirements of the mosfets in synchronous rectifier applications.

This circuit is limited to 50 duty ratio. For more information see the overview for mosfet and igbt gate drivers product page. The jfet transistor is used to connect the collector of the npn transistor to the base of the pnp transistor. By adding a steering diode to the gate circuit see figure 1 3 simple driver with independent rise and fall times on page 2.

When a mosfet or igbt gate threshold voltage is higher than the available drive voltage it s standard to use an. Circuit diagram of an igbt. It also contains the advantages of gtr like large current carrying capacity and high blocking voltage. Single ended transformer coupled gate drive circuit diagram.

Simple circuit overcomes mosfet gate threshold voltage challenge. Procedure for ground referenced and high side gate drive circuits ac coupled and transformer isolated solutions are described in great details. Driving mosfet and igbt switches using the.