Method, apparatus for temperature detection and wearable device
Embodiments of the present disclosure provide a method for temperature detection. The method comprises obtaining a sensed temperature from a sensor, the sensor being in a mounted mode where the sensor is thermally radiated by a variable heat source and a fixed heat source; determining a temperature change rate of the sensor and at least one affecting factor that affects temperature sensing of the sensor; and determining a temperature of the variable heat source based on the sensed temperature, the temperature change rate, and the affecting factor. According to the method of the present disclosure, the temperature of the variable heat source such as an ambient temperature can be obtained or determined without a dedicated sensor and cables. With this method, the ambient temperature can be determined by a sensor for sensing a temperature of a heating element such as a battery, a control unit or the like. In this way, extra spaces and product designs for mounting a dedicated sensor for the ambient temperature are no longer needed, which reduces costs of the product. Furthermore, user experience can be improved without increasing costs.
1 . A method for determining a temperature of a physical environment around a wearable device, comprising:
obtaining a sensed temperature from a sensor indicating an internal temperature inside the wearable device, the sensor being in a mounted mode on a constant temperature object wearing the wearable device where the sensor is thermally radiated by the physical environment and the constant temperature object wearing the wearable device;
determining, based on the sensed temperature from the sensor, a temperature change rate of the sensor and at least one affecting factor that affects temperature sensing of the sensor, wherein the at least one affecting factor comprises a first affecting factor A, a second affecting factor B and a third affecting factor C, the affecting factors A, B and C being constants; and
determining the temperature of the physical environment based on the sensed temperature, the temperature change rate and the affecting factors A, B and C,
wherein the temperature of the physical environment is determined by
T
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A
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T
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T
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B
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T
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T
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wherein T env denotes the environmental temperature, T NTC is the sensed temperature of the sensor, A denotes the first affecting factor that affects the temperature change rate, B denotes the second affecting factor that affects the sensed temperature, and C denotes the third affecting factor determined based on a temperature of the constant temperature object that affects an intermediate temperature determined based on the sensed temperature and the temperature change rate.
2 . The method of claim 1 , wherein determining the at least one affecting factor comprises:
determining the first affecting factor based on a power generated by an active component on a printed circuit board (PCB) where the sensor is mounted, and a first equivalent thermal conductivity around the sensor,
wherein the first equivalent thermal conductivity is associated with an equivalent thermal conductivity (λ env ) from the physical environment to the sensor and an equivalent thermal conductivity (λ pcb1 ) from the PCB to the physical environment.
3 . The method of claim 1 , wherein determining the at least one affecting factor comprises:
determining the second affecting factor based on a power generated by an active component on a printed circuit board (PCB) where the sensor is mounted, and a second equivalent thermal conductivity around the sensor,
wherein the second equivalent thermal conductivity is associated with an equivalent thermal conductivity (λ env ) from the physical environment to the sensor, an equivalent thermal conductivity (λ pcb1 ) from the PCB to the physical environment, an equivalent thermal conductivity (λ face ) from the constant temperature object to the sensor, and an equivalent thermal conductivity (λ pcb2 ) from the PCB to the constant temperature object.
4 . The method of claim 1 , wherein determining the at least one affecting factor comprises:
determining the third affecting factor based on a temperature of the constant temperature object, a power generated by an active component on a printed circuit board (PCB) where the sensor is mounted, and a third equivalent thermal conductivity around the sensor,
wherein a second equivalent thermal conductivity is associated with an equivalent thermal conductivity (λ env ) from the physical environment to the sensor, an equivalent thermal conductivity (λ pcb1 ) from the PCB to the physical environment, an equivalent thermal conductivity (λ face ) from the constant temperature object to the sensor, and an equivalent thermal conductivity (λ pcb2 ) from the PCB to the constant temperature object.
5 . The method of claim 1 , wherein determining the temperature change rate comprises:
obtaining a plurality of historical temperatures sensed by the sensor over a period of time; and
determining the change rate based on the plurality of historical temperatures and the period of time.