Electronic device and method of estimating core body temperature using the same
An electronic device according to an embodiment of the present disclosure includes: a first temperature sensor configured to measure a first temperature of body skin; a second temperature sensor configured to measure a second temperature inside a main body; a thermal resistance structure having effective thermal resistance so that a difference between the first temperature and the second temperature is greater than or equal to a predetermined threshold value; and a processor configured to obtain skin heat flux based on the first temperature and the second temperature, and to estimate core body temperature of a user based on the first temperature and the skin heat flux.
1 . An electronic device comprising:
a first circuit board;
a first temperature sensor disposed on the first circuit board and configured to measure a first temperature of body skin of a user;
a second circuit board spaced apart from the first circuit board;
a second temperature sensor disposed on the second circuit board and configured to measure a second temperature inside a main body of the electronic device;
a heat transfer material disposed between the first circuit board and the second circuit board, and in contact with the first circuit board and the second circuit board; and
at least one processor configured to obtain a skin heat flux based on the first temperature and the second temperature, and estimate a core body temperature of the user based on the first temperature and the skin heat flux.
2 . The electronic device of claim 1 , wherein at least one of the first temperature sensor and the second temperature sensor is a contact-type temperature sensor comprising a thermistor.
3 . The electronic device of claim 1 , wherein the first temperature sensor and the second temperature sensor are arranged in a thickness direction of the main body of the electronic device.
4 . The electronic device of claim 1 , wherein the thermal resistance structure has the thermal resistance that corresponds to a thermal resistance parameter including a thickness, a thermal conductivity, and a cross-sectional area of the thermal resistance structure.
5 . The electronic device of claim 1 , wherein the heat transfer materials-material comprise at least one of a C-clip and a pin connector.
6 . The electronic device of claim 1 , wherein the first circuit board, the second circuit board, and the heat transfer material constitute a thermal resistance structure,
wherein the heat transfer material comprises a first heat transfer material and a second heat transfer material,
wherein a thermal resistance parameter of the thermal resistance structure corresponds to types of the first circuit board and the second circuit board, types of the first heat transfer material and second heat transfer material, distances between the first heat transfer material and second heat transfer material, a distance between the first circuit board and the second circuit board, cross-sectional areas of the first circuit board and the second circuit board, and board contact areas of the first heat transfer material and second heat transfer material.
7 . The electronic device of claim 6 , wherein the thermal resistance parameter comprises the distances between the first heat transfer material and second heat transfer material and the distance between the first circuit board and the second circuit board, as a thickness parameter of the thermal resistance structure.
8 . The electronic device of claim 6 , wherein the thermal resistance parameter comprises a thermal conductivity of at least one of the first circuit board and the second circuit board, and thermal conductivities of first heat transfer material and second heat transfer material, as a thermal conductivity parameter of the thermal resistance structure.
9 . The electronic device of claim 6 , wherein the thermal resistance parameter comprises contact areas between the first heat transfer material and second heat transfer material and each of the first circuit board and the second circuit board, and a cross-sectional area of at least one of the first circuit board and the second circuit board, as a cross-section area parameter of the thermal resistance structure.
10 . The electronic device of claim 1 , wherein the at least one processor is further configured to estimate the skin heat flux based on the difference between the first temperature and the second temperature.
11 . The electronic device of claim 1 , further comprising a heat flux sensor disposed in the main body and configured to estimate a first heat flux,
wherein the at least one processor is further configured to estimate a second heat flux based on the difference between the first temperature and the second temperature, and obtain the skin heat flux based on the first heat flux and the second heat flux.
12 . The electronic device of claim 1 , wherein the at least one processor is further configured to estimate the core body temperature based on the first temperature and the skin heat flux by using a predefined body temperature estimation model.
13 . The electronic device of claim 1 , further comprising a display configured to output at least one of the first temperature, the second temperature, the core body temperature, core body temperature change information during a predetermined period, and body temperature guidance information.
14 . A method of estimating a core body temperature in an electronic device, the method comprising:
by a first temperature sensor, measuring a first temperature of body skin of a user;
by a second temperature sensor, measuring a second temperature inside a main body of the electronic device, the main body comprising a first circuit board on which the first temperature sensor is disposed, a second circuit board which is spaced apart from the first circuit board, and on which the second temperature sensor is disposed, and a heat transfer material disposed between the first circuit board and the second circuit board and in contact with the first circuit board and the second circuit board;
obtaining a skin heat flux based on the first temperature and the second temperature; and
estimating the core body temperature of the user based on the first temperature and the skin heat flux.
15 . The method of claim 14 , wherein the first circuit board, the second circuit board, and the heat transfer material constitute a thermal resistance structure, and
wherein the thermal resistance structure has the thermal resistance that corresponds to a thermal resistance parameter of the thermal resistance structure including a thickness, a thermal conductivity, and a cross-sectional area of the thermal resistance structure.
16 . The method of claim 14 , wherein the obtaining of the skin heat flux comprises estimating the skin heat flux based on the difference between the first temperature and the second temperature.
17 . The method of claim 14 , wherein the obtaining of the skin heat flux comprises:
by a heat flux sensor, measuring a first heat flux;
estimating a second heat flux based on the difference between the first temperature and the second temperature; and
obtaining the skin heat flux based on the first heat flux and the second heat flux.
18 . A wearable device comprising:
a main body comprising:
a body contact surface;
a first circuit board and a second circuit board that are apart from each other;
a plurality of temperature sensors comprising a first temperature sensor disposed on the first circuit board and configured to measure a first temperature of body skin of a user, and a second temperature sensor disposed on the second circuit board and configured to measure a second temperature inside the main body, when the body skin of the user comes into contact with the body contact surface;
a heat transfer material disposed between the first circuit board and the second circuit board, and in contact with the first circuit board and the second circuit board; and
at least one processor configured to perform predetermined operations based on temperature data measured by the plurality of temperature sensors.
19 . The wearable device of claim 18 , wherein the predetermined operations comprise at least one of transmitting the temperature data to another electronic device, determining a measurement state based on the temperature data, estimating core body temperature based on the temperature data, generating guidance information based on the temperature data, and outputting a processing result.