Sensor controlled transistor protection

摘要

A circuit for protecting a transistor is disclosed. The circuit includes a temperature sensing device coupled to the transistor and a tunable clamping circuit connected between transistor terminals, wherein the tunable clamping circuit is configured to provide an adjustable clamping voltage. A temperature controller coupled to the temperature sensing device and the tunable clamping circuit is also included. The temperature controller is configured to trigger a change in a clamping voltage of the tunable clamping circuit based on a feedback from the temperature sensing device.

主权项

1. A circuit for protecting a transistor, comprising:
a temperature sensing device coupled to the transistor, the temperature sensing device includes a sense diode that is biased with a pre-selected constant current; a tunable clamping circuit connected between transistor terminals through a diode, wherein the tunable clamping circuit is configured to provide an adjustable clamping voltage; and a temperature controller coupled to the temperature sensing device and the tunable clamping circuit, the temperature controller is configured to trigger a change in a clamping voltage of the tunable clamping circuit based on a feedback from the temperature sensing device.