Protective circuit for a field-effect transistor
AssigneeGKN Automotive AG
InventorRoman Liebsch
Life of this patent
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Abstract
A protective circuit includes a first field-effect transistor having a first drain terminal, a first source terminal and a first gate terminal, a control device by which an electrical first voltage between the first drain terminal and the first source terminal can be determined, and a first temperature sensor by which a first temperature of the first field-effect transistor can be detected, wherein a first resistance of the first field effect transistor and an electrical first current conducted via the first field-effect transistor can be determined by the control device based on the first temperature.
Claims21
-10. (cancelled)
A protective circuit comprising:
- a first field-effect transistor having a first drain terminal, a first source terminal and a first gate terminal;
- a control device by which an electrical first voltage between the first drain terminal and the first source terminal is determinable, and
- a first temperature sensor by which a first temperature of the first field-effect transistor is detectable;
- wherein a first resistance of the first field-effect transistor and an electrical first current conducted via the first field-effect transistor are determinable by the control device based on the first temperature.
A motor vehicle comprising an electrical machine and a protective circuit, the protective circuit including:
- a first field-effect transistor having a first drain terminal, a first source terminal and a first gate terminal;
- a control device by which an electrical first voltage between the first drain terminal and the first source terminal is determinable;
- and
- a first temperature sensor by which a first temperature of the first field-effect transistor is detectable;
- wherein a first resistance of the first field-effect transistor and an electrical first current conducted via the first field-effect transistor are determinable by the control device based on the first temperature;
- wherein the first drain terminal of the first field-effect transistor is connected to the electrical machine and to an electrical ground via the electrical machine.
A method for operating an electrical circuit comprising at least one protective circuit including a first field-effect transistor having a first drain terminal, a first source terminal and a first gate terminal;
- a control device by which an electrical first voltage between the first drain terminal and the first source terminal is determinable;
- and a first temperature sensor by which a first temperature of the first field-effect transistor is detectable;
- wherein a first resistance of the first field-effect transistor and an electrical first current conducted via the first field-effect transistor are determinable by the control device based on the first temperature;
- the method comprising:
- determining an electrical first voltage between the first drain terminal and the first source terminal;
- detecting a first temperature of the first field-effect transistor;
- calculating an electrical first current conducted via the first field-effect transistor based on the detected first temperature.
Dependencies are inferred from the claim text.