Gate Drive Transformer Circuit

Coilcraft s off the shelf gate drive transformers simplify the design of your gate drive circuit and shorten design cycle time.

Gate drive transformer circuit. Zeners are frequently used to protect the gate from transients. A gate drive circuit with very low impedance insures that the gate voltage is not exceeded in normal operation. This is explained in more detail in the next section. A gate drive transformer isolates the controlling gate drive circuit from the switch node when driving the mosfet gate and may also scale the output voltage via an appropriate primary to secondary turns ratio.

Gate drive transformers are essentially pulse transformers that are used. The basic circuit of a transformer based isolated gate drive is relatively large. Most circuit designers would consider these gate drive transformers to be a type of pulse transformer. In addition to the transformer it also consists of the associated reset components such as the blocking capacitor c primary resistor r gate resistor r g back to back zener diodes etc.

They also are used for voltage isolation and impedance matching. A special section deals with the gate drive requirements of the mosfets in synchronous rectifier applications. Some gate drive transformers simply deliver a voltage pulse or a series of voltage pulses to a semiconductor gate. Procedure for ground referenced and high side gate drive circuits ac coupled and transformer isolated solutions are described in great details.

For more information see the overview for mosfet and igbt gate drivers product page. They also are used for voltage isolation and impedance matching. A gate drive transformer is needed in a smps to control the timing of the circuit. A gate drive transformer is needed in a smps to control the timing of the circuit.

Gate drive transformer may be used to deliver voltage to the grids or plates of a vacuum tube or flash tube. These devices provide electrical pulses for turning on and off semiconductors such as high voltage power mosfets or igbts. Gate driver circuits need an isolated floating bias supply to maintain the required turn on bias when the fet source rises to the input voltage. Gate drive transformer circuit maintains fast turn off time this gate drive transformer gdt circuit allows the drive signal to the mosfet to range from 50 down to 0 while still offering a fast.

A gate drive transformer functioning in this manner could also be called a pulse transformer. This transformer is a bi directional link between the ground referenced control ic and the floating gate drive. A gate drive transformer isolates the controlling gate drive circuit from the switch node when driving the mosfet gate and may also scale the output voltage via an appropriate primary to secondary turns ratio.