Limiting circuit for a semiconductor transistor and method for limiting the voltage across a semiconductor transistor

摘要

A limiting circuit for at least one semiconductor transistor. The circuit includes a limiting path which is coupled between a first power terminal and a second power terminal of the semiconductor transistor. The limiting path includes a limiting transistor. A node of the limiting path located between the limiting transistor and the second power terminal of the semiconductor transistor is coupled to a control terminal of the semiconductor transistor. A voltage source is coupled to the control terminal of the limiting transistor and is designed to apply a control voltage to said control terminal of the limiting transistor. The control voltage corresponds to a critical voltage for the voltage between the first power terminal and the second power terminal of the semiconductor transistor. The limiting transistor is switched to a conductive state when said critical voltage is exceeded at a power terminal of said limiting transistor.

主权项

1. A limiting circuit for at least one semiconductor transistor, the circuit comprising:
a limiting path coupled between a first power terminal and a second power terminal of the semiconductor transistor and including a limiting transistor, wherein a node of the limiting path between the limiting transistor and the second power terminal of the semiconductor transistor is coupled to a control terminal of the semiconductor transistor; a voltage source, the voltage source comprising a boost converter which is designed to boost a supply voltage at an input terminal of the boost converter to the control voltage for the limiting transistor; wherein the voltage source is coupled to a control terminal of the limiting transistor, and wherein the voltage source is designed to supply a control voltage to the control terminal of the limiting transistor, the control voltage corresponding to a critical voltage for the voltage between the first power terminal and the second power terminal of the semiconductor transistor; and wherein the limiting transistor is switched to the conductive state when the critical voltage is exceeded at a power terminal of the limiting transistor.