Thermistor sensor arrangement for measuring chipset temperature

Patent metadata

Field	Value
Publication number	US-11733107-B2
Application number	US-202017067654-A
Country	US
Kind code	B2
Filing date	Oct 10, 2020
Priority date	Oct 10, 2020
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A thermistor sensor arrangement for measuring chipset temperature is provided. According to various aspects of the present disclosure, a sensor assembly is placed between a heat sink of a chipset and a PCB on which the chipset is mounted. The sensor assembly includes a thermistor sensor, an electrical connector, and a resilient pad. The thermistor sensor includes a first end having a sensing element and a second end having sensor contacts. The electrical connector has a first interface to receive the sensor contacts, a second interface through which the signals are outputted, and a bottom surface to mount to the PCB. The resilient pad has an upper surface to which the sensing element is attached and a lower surface to engage with the PCB such that when the resilient pad is compressed, spring force of the resilient pad facilitates temperature measurement by pressing the sensing element against the heat sink.

First claim

What is claimed is:

1. A sensor assembly to be placed between a heat sink of a chipset and a printed circuit board (PCB) on which the chipset is mounted for measurement of a temperature associated with the chipset, the sensor assembly comprising:
a thermistor sensor comprising a first end having a sensing element to measure the temperature and a second end having sensor contacts to output signals indicative of the temperature;
an electrical connector having a first interface to receive the sensor contacts, a second interface through which the signals are output, and a bottom surface to mount to the PCB; and
a resilient pad having an upper surface to which the sensing element is attached and a lower surface to engage with the PCB, wherein when the resilient pad is compressed between the heat sink and the PCB, a spring force of the resilient pad facilitates the measurement by pressing the sensing element against the heat sink.

2. The sensor assembly of claim 1 , wherein the sensor contacts comprise conductors of a flexible flat cable (FFC).

3. The sensor assembly of claim 1 , wherein the electrical connector comprises a Flexible Printed Circuit (FPC) connector.

4. The sensor assembly of claim 1 , wherein resilient pad has a compression ratio of between 20% to 40%.

5. The sensor assembly of claim 1 , wherein a temperature resistant adhesive bonds the sensing element to the upper surface of the resilient pad.

6. The sensor assembly of claim 5 , wherein the temperature resistant adhesive bonds the lower surface of the resilient pad to the PCB.

7. The sensor assembly of claim 1 , wherein the sensing element comprises a stiff, flat sensing area.

8. The sensor assembly of claim 7 , wherein the sensing element comprises a flex foil circuit.

9. The sensor assembly of claim 8 , wherein the thermistor sensor comprises a negative temperature coefficient (NTC) thermistor sensor.

10. A system comprising:
a printed circuit board (PCB);
a chipset mounted on the PCB;
a heat sink mounted on the chipset; and
a sensor assembly placed between the heat sink and the PCB for measurement of a temperature associated with the chipset, the sensor assembly comprising:
a thermistor sensor comprising a first end having a sensing element to measure the temperature and a second end having sensor contacts to output signals indicative of the temperature;
an electrical connector having a first interface coupled to the sensor contacts, a second interface through which the signals are output, and a bottom surface mounted to the PCB; and
a resilient pad having an upper surface to which the sensing element is attached and a lower surface engaging the PCB, wherein the resilient pad is compressed between the heat sink and the PCB creating a spring force that presses the sensing element against the heat sink.

11. The system of claim 10 , wherein the sensor contacts comprise conductors of a flexible flat cable (FFC).

12. The system of claim 10 , wherein the electrical connector comprises a Flexible Printed Circuit (FPC) connector.

13. The system of claim 10 , wherein resilient pad has a compression ratio of between 20% to 40%.

14. The system of claim 10 , wherein a temperature resistant adhesive bonds the sensing element to the upper surface of the resilient pad.

15. The system of claim 14 , wherein the temperature resistant adhesive bonds the lower surface of the resilient pad to the PCB.

16. The system of claim 10 , wherein the sensing element comprises a stiff, flat sensing area.

17. The system of claim 16 , wherein the sensing element comprises a flex foil circuit.

18. The system of claim 17 , wherein the thermistor sensor comprises a negative temperature coefficient (NTC) thermistor sensor.

19. A method comprising:
providing a sensor assembly between a heat sink of a chipset and a printed circuit board (PCB) on which the chipset is mounted, wherein the sensor assembly includes:
a thermistor sensor comprising a first end having a sensing element to measure a temperature of the heat sink and a second end having sensor contacts to output signals indicative of the temperature;
an electrical connector having a first interface to receive the sensor contacts, a second interface through which the signals are output, and a bottom surface to mount to the PCB; and
a resilient pad having an upper surface to which the sensing element is attached and a lower surface to engage with the PCB, wherein when the resilient pad is compressed between the heat sink and the PCB, a spring force of the resilient pad facilitates measurement of the temperature by pressing the sensing element against the heat sink;

receiving, by a system management controller (SMC), the temperature of the heat sink via the second interface; and
determining, by the SMC, a temperature of the chipset based on the temperature of the heat sink.

Assignees

• Fortinet Inc

Inventors

• Luo Shan
• Zhong Shen Sunny
• Yu Qian
• Jiang Shenghua

Classifications

• G01K7/223 Primary

  characterised by the shape of the resistive element · CPC title

• G01K1/08

  Protective devices, e.g. casings · CPC title

• G01K7/22 Primary

  the element being a non-linear resistance, e.g. thermistor (G01K7/26 takes precedence) · CPC title

• G01K1/14

  Supports; Fastening devices; Arrangements for mounting thermometers in particular locations · CPC title