US 2012/0236456 A1 · TRANSISTOR CIRCUIT WITH PROTECTING FUNCTION

Abstract

The present invention provides a transistor circuit with protecting function. The transistor circuit includes a transistor, a voltage detecting unit, a current detecting unit, a temperature detecting unit, and a protecting unit. The voltage detecting unit detects a voltage drop of the transistor and generates an over-voltage protection signal. The current detecting signal detects a current flowing through the transistor and generates an over-current protection signal. The temperature detecting unit detects a temperature of the transistor circuit and generates an over-temperature protection signal. The protecting unit is coupled to the control terminal to control a state of the transistor according to the over-voltage protection signal, the over-current protection signal, and the over-temperature protection signal to reduce the voltage difference between the control terminal and the second terminal, such that the voltage drop of the transistor is decreased or decreased to zero.

Claims14

Dependent claims

A transistor circuit with protecting function, packaged in a single package structure having a first terminal, a second terminal and a control terminal, the transistor circuit comprising:

a transistor, having a drain end, a source end and a gate end, in which the drain end is coupled to the first terminal, the source end is coupled to the second terminal and the gate end is coupled to the control terminal;
a voltage detecting unit, detecting a voltage drop of the transistor and generating an over-voltage protection signal;
and
a protecting unit, coupled to the control terminal, controlling a state of the transistor according to the over-voltage protection signal;
wherein the protecting unit reduces a voltage difference between the control terminal and the second terminal when the voltage drop of the transistor is higher than a first preset voltage, such that a current flowing through the transistor is decreased or decreased to zero.

2 more elements

Dependencies are inferred from the claim text.

Transistor circuit with protecting function

Life of this patent

Transistor circuit with protecting function

Life of this patent

Abstract

Claims14