Temperature computing parameter providing circuit, temperature computing parameter providing method and temperature monitoring method

Patent metadata

Field	Value
Publication number	US-11221259-B2
Application number	US-201916702490-A
Country	US
Kind code	B2
Filing date	Dec 3, 2019
Priority date	Dec 20, 2018
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A temperature computing parameter providing circuit, configured to generate sensing voltage values and calibrated voltage values as temperature computing parameters for a target electronic device, including: a parameter computing circuit, configured to compute a reference voltage, which is a cross voltage of a reference resistor coupled to the target electronic device in series, to generate a reference voltage value, and to compute the sensing voltage, which is a cross voltage of the target electronic device, to generate the sensing voltage value; a reference temperature sensing circuit, configured to sense a current reference temperature of the reference resistor; and a computing circuit, configured to calibrate the reference voltage value to generate the calibrated voltage value according to a calibrating function and the current reference temperature. The calibrating function corresponds to a resistance-temperature variation function.

First claim

What is claimed is:

1. A temperature computing parameter providing circuit, configured to generate a sensing voltage value and a calibrated voltage value as temperature computing parameters for a target electronic device, comprising:
a parameter computing circuit, coupled to the target electronic device, configured to compute a reference voltage to generate a reference voltage value, the reference voltage is a cross voltage of a reference resistor coupled to the target electronic device in series, and to compute the sensing voltage which is a cross voltage of the target electronic device to generate the sensing voltage value;
a reference temperature sensing circuit, coupled to the reference resistor, configured to sense a current reference temperature of the reference resistor; and
a calibrating circuit, coupled to the parameter computing circuit and the reference temperature sensing circuit, configured to calibrate the reference voltage value according to a calibrating function and the current reference temperature to generate the calibrated voltage value;
wherein the calibrating function corresponds to a resistance-temperature variation function of the reference resistor.

2. The temperature computing parameter providing circuit of claim 1 , wherein the calibrating circuit generates the calibrated voltage value according to the resistance-temperature variation function and the current reference temperature, wherein the calibrated voltage corresponds to a resistance variation of the reference resistor due to a temperature.

3. The temperature computing parameter providing circuit of claim 1 , wherein the resistance-temperature variation function is Rr(T1)=Rr(T0)×(1+αs(T1−T0)) wherein T0 is an initial reference temperature and T1 is the current reference temperature, Rr(T1) and Rr(T0) respectively indicates resistance values of the reference resistor at T1 and T0, and αs is a temperature coefficient of the reference resistor.

4. The temperature computing parameter providing circuit of claim 3 , wherein the calibrating circuit divides the reference voltage value by (1+αs(T1−T0)) to calibrate the reference voltage value, to generate the calibrated voltage value.

5. The temperature computing parameter providing circuit of claim 1 , wherein the parameter computing circuit comprises:
an analog input signal providing circuit, comprising a first input terminal and a second input terminal, the first input terminal is coupled to a first terminal of the reference resistor, a second terminal of the reference resistor is coupled to a first input terminal of the target electronic device, the second input terminal is coupled to a second terminal of the target electronic device;
wherein the analog input signal providing circuit provides an input signal at the first input terminal to the reference resistor and the target electronic device to generate the reference voltage and the sensing voltage, and the sensing voltage is a cross voltage of the first terminal and the second terminal of the target electronic device.

6. The temperature computing parameter providing circuit of claim 5 , wherein the reference computing circuit further comprises:
a reference voltage generating circuit, comprising a first input terminal and a second input terminal, wherein the first input terminal and the second input terminal of the reference voltage generating circuit are respectively coupled to the first terminal and the second terminal of the reference resistor, configured to receive the reference voltage and to generate the reference voltage value accordingly; and
a sensing voltage value generating circuit, comprising a first input terminal and a second input terminal, wherein the first input terminal and the second input terminal of the sensing voltage value generating circuit are respectively coupled to the first terminal and the second terminal of the target electronic device, configured to receive the sensing voltage and to accordingly generate the sensing voltage value.

7. The temperature computing parameter providing circuit of claim 6 , provided in an IC which comprising two data transmitting terminals respectively transmitting the sensing voltage value and the calibrated voltage value, and the IC does not output a value of the current reference temperature.

8. The temperature computing parameter providing circuit of claim 1 , wherein a resistance value of the target electronic device is linear with a temperature, and the target electronic device is a voice coil.

9. A temperature computing parameter providing method, for generating a sensing voltage value and a calibrated voltage value as temperature computing parameters for a target electronic device, comprising:
(a) computing a reference voltage to generate a reference voltage value, the reference voltage is a cross voltage of a reference resistor coupled to the target electronic device in series, and computing a sensing voltage which is a cross voltage of the target electronic device to generate the sensing voltage value;
(b) sensing a current reference temperature of the reference resistor; and
(c) calibrating the reference voltage value according to a calibrating function and the current reference temperature to generate the calibrated voltage value;
wherein the calibrating function corresponds to a resistance-temperature variation function of the reference resistor.

10. The temperature computing parameter providing method of claim 9 , wherein the step (c) generates the calibrated voltage value according to the resistance-temperature variation function and the current reference temperature, wherein the calibrated voltage corresponds to a resistance variation of the reference resistor due to a temperature.

11. The temperature computing parameter providing method of claim 9 , wherein the resistance-temperature variation function is Rr(T1)=Rr(T0)×(1+αs(T1−T0)), wherein T0 is an initial reference temperature and T1 is the current reference temperature, Rr(T1) and Rr(T0) respectively indicate resistance values of the reference resistor at T1 and T0, and αs is a temperature coefficient of the reference resistor.

12. The temperature computing parameter providing method of claim 11 , wherein the step (c) divides the reference voltage value by (1+αs(T1−T0)) to calibrate the reference voltage value, to generate the calibrated voltage value.

13. The temperature computing parameter providing method of claim 9 , wherein a resistance value of the target electronic device is linear with a temperature, and the target electronic device is a voice coil.

14. A temperature monitoring method, for generating a sensing voltage value and a calibrated voltage value as temperature computing parameters for a target electronic device and for monitoring a temperature of the target electronic device, comprising:
(a) computing a reference voltage to generate a reference voltage value which is a cross voltage of a reference resistor coupled to the target electronic device in series, and computing a sensing voltage which is a cross voltage of the target electronic device to generate the sensing voltage value;
(b) sensing a current reference temperature of the reference resistor;
(c) calibrating the reference voltage value according to a calibrating function and the current reference temperature to generate the calibrated voltage value; and
(d) computing the temperature according to the sensing voltage value and the calibrated voltage value, and adjusting a power of the target electronic device when the temperature is over a threshold value;
wherein the calibrating function corresponds to a resistance-temperature variation function of the

Assignees

• Realtek Semiconductor Corp

Inventors

• Chen Shin-Hao
• Tu Yi-Chang

Classifications

• G01K7/16

  using resistive elements · CPC title

• G01K15/005 Primary

  Calibration · CPC title

• G01K7/25

  for modifying the output characteristic, e.g. linearising · CPC title