Integrated protection devices with monitoring of electrical characteristics

• US 10,559,559 B2
• Filed: 05/17/2017
• Issued: 02/11/2020
• Est. Priority Date: 04/25/2011
• Status: Active Grant

• Current Assignee: Volterra Semiconductor Corporation (Analog Devices, Inc.)
• Original Assignee: Volterra Semiconductor Corporation (Analog Devices, Inc.)
• Inventors: Lidsky, David, Djekic, Ognjen, Opris, Ion Elinor, You, Budong, Stratakos, Anthony J., Ikriannikov, Alexandr, Beronja, Biljana, Roessig, Trey
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Dominique, Emmanuel
• Application Number:
  US15/598,037
• Publication Number:
  US 20170256532A1
• Time in Patent Office: 1,000 Days
• Field of Search: 307126
• CPC Class Codes: G01R 19/16552 in I.C. power supplies
• CPC Class Codes: H01L 27/0266 using field effect transistors as protective elements
• CPC Class Codes: H02H 3/087 for dc applications
• CPC Class Codes: H02H 3/18 responsive to reversal of direct current
• CPC Class Codes: H02H 3/202 for dc systems
• CPC Class Codes: H02H 3/42 responsive to product of voltage and current

Abstract

Disclosed are systems, devices, circuits, components, mechanisms, and processes in which a switching mechanism can be coupled between components. The switching mechanism is configured to have an on state or an off state, where the on state allows current to pass along a current path. A monitoring mechanism has one or more sensing inputs coupled to sense an electrical characteristic at the current path. The electrical characteristic can be a current, voltage, and/or power by way of example. The monitoring mechanism is configured to output a reporting signal indicating the sensed electrical characteristic. The monitoring mechanism can be integrated with the switching mechanism on a chip.

Claims

1. A device comprising:

a switching mechanism capable of being coupled between a power supply and a device, the switching mechanism configured to have an on state in which the power supply is coupled to the device or an off state in which the power supply is de-coupled from the device, the on state allowing current to pass from the power supply to the device along a current path; and

a controller including;

a current measuring mechanism having one or more current sensing inputs coupled to sense a current at the current path, and

a power measuring mechanism having;

one or more current sensing inputs coupled to sense the current at the current path, and a voltage sensing input coupled to sense a voltage at a node between the switching mechanism and the device, the power measuring mechanism configured to measure a power based on the sensed current and the sensed voltage,

the controller operatively coupled to cause the switching mechanism to have the off state in which the power supply is de-coupled from the device responsive to one or more events indicative of a system fault condition, the one or more events including the sensed current meeting or exceeding a current threshold and the measured power meeting or exceeding a designated power threshold, the current threshold being adjustable in relation to changes in the sensed voltage to maintain the designated power threshold, the controller integrated with the switching mechanism on a chip.

2. The device of claim 1, the chip being a flip chip.

3. The device of claim 1, the controller further having a temperature sensing input coupled to sense a temperature, the controller further operatively coupled to cause the switching mechanism to have the off state responsive to the one or more events including the sensed temperature exceeding a designated temperature threshold.

4. The device of claim 1, the power being measured using a scaled sensed current having a scale ratio with respect to the sensed current.

5. The device of claim 1, further comprising a reverse current switch coupled in series with the switching mechanism, the reverse current switch configured to have the on state or the off state.

6. The device of claim 5, the switching mechanism having a bulk connection, the reverse current switch having a reverse bulk connection.

7. A process comprising:

sensing, using a current measuring mechanism, a current at a current path between a power supply and a device, a switching mechanism being coupled between the power supply and the device, the switching mechanism configured to have an on state in which the power supply is coupled to the device or an off state in which the power supply is de-coupled from the device, the on state allowing current to pass from the power supply to the device along the current path;

sensing a voltage at a node between the switching mechanism and the device;

measuring, using a power measuring mechanism, a power based on the sensed current and the sensed voltage; and

controlling the switching mechanism to have the off state in which the power supply is de-coupled from the device responsive to the sensed current meeting or exceeding a current threshold and responsive to the measured power meeting or exceeding a designated power threshold, the current threshold being adjustable in relation to changes in the sensed voltage to maintain the designated power threshold.

8. The process of claim 7, further comprising:

comparing a first electrical characteristic sensed at the current path with a first threshold and a second threshold.

9. The process of claim 8, wherein the first threshold and the second threshold are adjustable.

10. The process of claim 8, further comprising:

determining that the sensed first electrical characteristic meets or exceeds the first threshold but does not meet or exceed the second threshold; and

sensing, responsive to the determination, a second electrical characteristic at the current path.

11. The process of claim 10, further comprising:

determining that the sensed second electrical characteristic meets or exceeds both the first threshold and the second threshold; and

causing, responsive to the determination, the switching mechanism to have the off state.

12. The process of claim 10, further comprising:

determining that the sensed second electrical characteristic does not exceed the second threshold; and

generating, responsive to the determination, a signal indicative of the sensed first electrical characteristic.

13. The process of claim 7, further comprising:

providing a reporting signal indicating the sensed current and the measured power.

14. The process of claim 7, wherein a designated time period passes between sensing the voltage and sensing the current.

15. The process of claim 14, wherein the time period is one of a plurality of selectable time periods.

16. The process of claim 14, wherein the time period is programmable.

17. The process of claim 14, wherein controlling the switching mechanism to have the off state includes:

causing the switching mechanism to have the off state after passing of the time period.