초록 ▼

An active resistance is controlled to modify a drive signal provided to a gated device such as an insulated gate bipolar transistor (IGBT). The active resistance is between an input lead that receives an input drive signal, such as from a conventional gate driver IC, and an output lead at which an o

An active resistance is controlled to modify a drive signal provided to a gated device such as an insulated gate bipolar transistor (IGBT). The active resistance is between an input lead that receives an input drive signal, such as from a conventional gate driver IC, and an output lead at which an output drive signal is provided to the device's gate. The active resistance is controlled in response to a feedback signal that includes information about the output drive signal, so that the output drive signal is a modified version of the input drive signal. To reduce di/dt and hence control EMI emission, the output drive signal can include turn-on and turn-off transitions where the input drive signal includes steps. A transition can, for example, include an interval during which the active resistance is greater than zero to reduce peak voltage, another interval during which the active resistance is approximately zero to allow a large gate current, and yet another interval during which the active resistance is greater than zero to limit gate current. The active resistance can be an active resistance device such as a MOSFET resistor, with its channel connected in series between the input and output leads. Similar circuitry can be provided for turn-on and for turn-off. The gate control circuit can be on an integrated circuit with a pin for connecting directly to an IGBT's gate.

대표청구항 ▼

1. A method of controlling a gated device, comprising:receiving an input drive signal at an input lead; and in response to the input drive signal and a feedback signal, providing an output drive signal for the device's gate at an output lead, the feedback signal including information about the outpu

1. A method of controlling a gated device, comprising:receiving an input drive signal at an input lead; and in response to the input drive signal and a feedback signal, providing an output drive signal for the device's gate at an output lead, the feedback signal including information about the output drive signal; the act of providing the output drive signal including; responding to the feedback signal by controlling an active resistance between the input and output leads so that the output drive signal is a modified version of the input drive signal, the act of controlling the active resistance comprising providing an active resistance device that has a gate lead for receiving a control signal and a channel connected in series between the input and output leads, the resistance of the channel being controlled by the control signal; and providing the control signal to control the resistance of the active resistance device in response to the feedback signal.