Electronic fuse

• US 9,979,180 B2
• Filed: 10/20/2014
• Issued: 05/22/2018
• Est. Priority Date: 10/20/2014
• Status: Active Grant

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Bader, Markus, Keser, Goran
• Primary Examiner(s): Freeman, Joshua E
• Application Number:
  US14/518,685
• Publication Number:
  US 20160109212A1
• Time in Patent Office: 1,310 Days
• CPC Class Codes: F42C 15/40 wherein the safety or arming action is effected electrically
• CPC Class Codes: H02H 3/087 for dc applications

Abstract

According to an example, a device is suggested, said device comprising a switching element, an integrated sensor providing a signal and an electronic fuse that is arranged to determine a fuse condition based on the signal and based on at least one fuse characteristic and to trigger a fuse event in case the fuse condition is met.

Claims

1. A device comprising:

a switching element,

an integrated sensor arranged to provide a signal, and

a separate electronic fuse that is arranged

to receive the signal from the integrated sensor,

to determine a fuse condition based on the signal and based on at least one fuse characteristic, and

to trigger a fuse event in case the fuse condition is met,

wherein the electronic fuse comprises both a software entity and a hardware entity, and wherein the software entity and the hardware entity monitor each other and provide separate output signals to a processing logic that controls the switching element to safeguard a load in a redundant manner.

2. The device according to claim 1, wherein the switching element comprises an electronic switching element or a mechanical switching element.

3. The device according to claim 1, wherein the electronic fuse is arranged to not trigger the fuse event in case the fuse condition is not met.

4. The device according to claim 1, wherein the integrated sensor is part of the switching element.

5. The device according to claim 1, wherein the switching element and the integrated sensor are arranged on a single chip.

6. The device according to claim 1, wherein the switching element is a vertical element comprising:

a control terminal,

a first terminal, and

a second terminal,

wherein the first and the second terminal are electrically coupled via a signal applied to the control terminal, and

wherein the control terminal and the first terminal are arranged on one side of the vertical element and the second terminal is arranged at the opposite side of the vertical element.

7. The device according to claim 1, wherein the switching element comprises at least one of the following:

a transistor;

a MOSFET;

an IGBT;

a JFET;

a diode;

a vertical element;

a protected FET;

a high-side switching element;

a low-side switching element;

or

an electrical relay.

8. The device according to claim 1, wherein the signal provided by the integrated sensor is a power or a power-based signal.

9. The device according to claim 1, wherein at least one of the software entity and the hardware entity are arranged to:

determine the fuse condition based on the signal and based on at least one fuse characteristic, and

trigger the fuse event in case the fuse condition is met.

10. The device according to claim 9, wherein said at least one entity is both the hardware entity or a software entity.

11. The device according to claim 9, wherein the at least one entity is arranged for determining the fuse condition based on a fuse characteristic.

12. The device according to claim 11, wherein said fuse characteristic is at least partially simulated or modelled by or within the at least one entity.

13. The device according to claim 9, wherein the switching element is switched off in case the at least one entity triggered the fuse event.

14. The device according to claim 1, wherein the software entity utilizes a thermal model and iteratively determines and compares a thermal load with a predefined threshold.

15. The device according to claim 1, wherein the fuse condition is determined in case the signal reaches or exceeds a threshold.

16. The device according to claim 1, wherein the fuse event is conveyed to the switching element.

17. The device according to claim 1, wherein the fuse event is conveyed to a processing logic that controls the switching element.

18. The device according to claim 1, wherein the signal is provided by a sensor that is external to the switching element.

19. The device according to claim 1, wherein the switching element comprises a thermal over-temperature shut-down functionality.

20. The device according to claim 1, wherein the switching element comprises a first output directly connected to a load and a second output coupled an input of the electronic fuse, the second output configured to provide the signal as a load-dependent signal to the electronic fuse.

21. The device of claim 1, wherein at least one of the software entity and the hardware entity may be tested individually on demand, and wherein during such testing the respective other entity is configured to provide the functionality of the electronic fuse.

22. The device of claim 1, wherein the hardware entity comprises:

an offset and scale component coupled to the signal;

a square component coupled to the offset and scale component;

an integrated/low pass filter component coupled to the square component; and

a Schmitt trigger coupling the integrated/low past filter component to an output configured to provide a hardware output signal.

23. A method for controlling a switching element comprising:

receiving, at a separate electronic fuse a signal provided by an integrated sensor of the switching element,

determining a fuse condition by the electronic fuse based on the signal provided by the integrated sensor of the switching element and based on at least one fuse characteristic of the electronic fuse, and

triggering a fuse event by the electronic fuse in response to the fuse condition being met,

wherein the electronic fuse comprises both a software entity and a hardware entity, and wherein the software entity and the hardware entity monitor each other and provide separate output signals to a processing logic that controls the switching element to safeguard a load in a redundant manner.

24. A device comprising:

means for determining a fuse condition based on a load-dependent signal provided to a separate electronic fuse by an integrated sensor of a switching element and based on at least one fuse characteristic, and

means for triggering a fuse event in case the fuse condition is met,

wherein the electronic fuse comprises both a software entity and a hardware entity, and wherein the software entity and the hardware entity monitor each other and provide separate output signals to a processing logic that controls the switching element to safeguard a load in a redundant manner.

25. A non-transitory computer readable medium comprising instructions that, when executed by a digital processing device, cause the digital processing device to:

receive a signal provided by an integrated sensor of a switching element,

determine a fuse condition of a separate electronic fuse based on the signal provided by the integrated sensor of the switching element and based on at least one fuse characteristic of the electronic fuse, and

trigger a fuse event by the electronic fuse in response to the fuse condition being met,

wherein the electronic fuse comprises both a software entity and a hardware entity, and wherein the software entity and the hardware entity monitor each other and provide separate output signals to a processing logic that controls the switching element to safeguard a load in a redundant manner.