WO2017000295A1 - 一种电子体温计及其控制方法 - Google Patents

一种电子体温计及其控制方法 Download PDF

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Publication number
WO2017000295A1
WO2017000295A1 PCT/CN2015/083138 CN2015083138W WO2017000295A1 WO 2017000295 A1 WO2017000295 A1 WO 2017000295A1 CN 2015083138 W CN2015083138 W CN 2015083138W WO 2017000295 A1 WO2017000295 A1 WO 2017000295A1
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WIPO (PCT)
Prior art keywords
time
charging
charge
capacitor
control chip
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PCT/CN2015/083138
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English (en)
French (fr)
Inventor
文孟军
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深圳市谷玛鹤健康科技有限公司
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Priority to PCT/CN2015/083138 priority Critical patent/WO2017000295A1/zh
Publication of WO2017000295A1 publication Critical patent/WO2017000295A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/20—Clinical contact thermometers for use with humans or animals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/01—Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Definitions

  • the invention relates to the field of medical and health, and in particular to an electronic thermometer and a control method thereof.
  • thermometers In the field of electronic thermometers, temperature measurement values have conventionally been obtained by measuring changes in resistance of a thermistor accompanying temperature changes. Specifically, the temperature change is converted into a voltage or current change by a thermistor, then amplified and analog-digital converted, and finally the body temperature is calculated by a general-purpose micro-processing chip. With this method, since the accuracy of the measurement is determined by the accuracy of the thermistor and the accuracy of the power supply voltage, the accuracy is low. At the same time, due to the need to use analog-to-digital converters and voltage regulators during body temperature acquisition, power consumption is large.
  • the technical problem to be solved by the present invention is to provide an electronic thermometer and a control method thereof, which can realize high-precision body temperature measurement at a lower cost and lower power consumption.
  • an electronic thermometer including a wireless control chip, a thermistor, a reference resistor and a capacitor;
  • the wireless control chip includes a first control end and a second control And a third control end; the first control end is connected to one end of the reference resistor, the second control end is connected to one end of the thermistor, the other end of the reference resistor, and the other end of the thermistor are respectively connected to one end of the capacitor, the capacitor The other end is grounded, and the third control terminal is connected to a common node of the reference resistor, the thermistor and the capacitor; wherein the wireless control chip performs charge and discharge operations and charge and discharge operations of the thermistor and the capacitor by alternately controlling the reference resistor and the capacitor. To get the temperature around the thermistor.
  • the electronic thermometer further includes an antenna, and the antenna is connected to the wireless control chip, and is configured to wirelessly transmit the temperature around the thermistor obtained by the wireless control chip.
  • the electronic thermometer further comprises a battery and a switch, and the battery is connected to the wireless control chip through the switch, wherein the wireless control chip is powered on or off by the switch being opened or closed.
  • another technical solution adopted by the present invention is to provide a method for controlling an electronic thermometer, the method comprising: controlling, by a first control terminal of the wireless control chip, a high-low level control reference resistor and a capacitor.
  • a charging and discharging operation to obtain a first charging and discharging time
  • a second control terminal of the wireless control chip outputs a high and low level control the thermistor and the capacitor to perform a charging and discharging operation to obtain a second charging and discharging corresponding to the first charging and discharging time
  • obtaining a ratio of each of the first charging and discharging times to a corresponding second charging and discharging time which is recorded as a time ratio
  • obtaining an average of the first time ratios recorded as a second time ratio
  • matching the second time ratio in the sample database to obtain a temperature around the thermistor, wherein the sample database includes the sample temperature and the sample The sample time ratio corresponding to the temperature.
  • the step of matching the second time ratio in the sample database to obtain the temperature around the thermistor is specifically: obtaining a time ratio of two samples adjacent to the second time ratio in the sample database, which is recorded as the first The ratio of the time to the second sample time, wherein the first sample time ratio is less than the second sample time ratio; obtaining the difference between the second time ratio and the first sample time ratio, recorded as the first difference; The difference between the ratio of the two sample time to the time of the first sample is recorded as the second difference; and the ratio of the ratio of the first difference to the second difference and the sample temperature corresponding to the first sample time ratio are obtained.
  • the temperature around the thermistor is specifically: obtaining a time ratio of two samples adjacent to the second time ratio in the sample database, which is recorded as the first The ratio of the time to the second sample time, wherein the first sample time ratio is less than the second sample time ratio; obtaining the difference between the second time ratio and the first sample time ratio, recorded as the first difference; The difference between the ratio of the two sample time to the time
  • the method further includes the steps of: obtaining a ratio of each of the first charging and discharging times to the corresponding second charging and discharging time, which is recorded as The three time ratios are obtained as the first mean value; the absolute value of the difference between each third time ratio and the first mean value is obtained as the first absolute value; the first absolute value is deleted.
  • the third time ratio within a predetermined range is corresponding to the first charge and discharge time and the second charge and discharge time.
  • the method further includes the steps of: obtaining an average value of each of the first charging and discharging times, and recording the second average value; acquiring the first charging The absolute value of the difference between the discharge time and the second mean is recorded as the second absolute value; The first charge and discharge time and the corresponding second charge and discharge time are not in the second predetermined range.
  • the method further includes the steps of: obtaining an average value of each of the second charging and discharging times, and recording the third average value; acquiring each second charging The absolute value of the difference between the discharge time and the third mean is recorded as a third absolute value; the second charge and discharge time in which the third absolute value is not within the third predetermined range and the corresponding first charge and discharge time are deleted.
  • the step of obtaining the first charging and discharging time by the first control terminal of the wireless control chip to output the high and low level control reference resistors and capacitors to obtain the first charging and discharging time is specifically: controlling the first control end of the wireless control chip to output high power The capacitor is charged by the reference resistor and starts timing; when the wireless control chip detects that the third control terminal is high, the first control terminal of the control wireless control chip outputs a low level to discharge the capacitor through the reference resistor; When the wireless control chip detects that the third control terminal changes from a high level to a low level, the timing is stopped to obtain a first charging and discharging time.
  • the method further includes: configuring the first control end to be an output mode, the second control end, and the first The third control terminal is an input mode; the first control terminal of the control wireless control chip outputs a low level and maintains the first predetermined time.
  • the step of controlling the thermistor and the capacitor to perform the charging and discharging operation to obtain the second charging and discharging time corresponding to the first charging and discharging time is specifically: controlling the second control end of the wireless control chip to output a high level to pass the thermal The resistor charges the capacitor and starts timing; when the wireless control chip detects that the third control terminal is high, the second control terminal of the control wireless control chip outputs a low level to discharge the capacitor through the thermistor; when the wireless control When the chip detects that the third control terminal changes from a high level to a low level, the timing is stopped to obtain a second charging and discharging time.
  • the method further includes: configuring the second control end to be an output mode, the first control end and The third control terminal is an input mode; the second control terminal of the control wireless control chip outputs a low level and maintains a second predetermined time.
  • the wireless control chip acquires a second time ratio corresponding to the sample temperature, which is recorded as a sample time ratio, wherein a plurality of sample temperatures and corresponding sample time ratios form a sample database.
  • another technical solution adopted by the present invention is to provide a control method for an electronic thermometer, the control method comprising: controlling a reference resistor and a capacitor through a first control terminal of the wireless control chip to output a high and low level.
  • the step of obtaining the first charging and discharging time by the first control terminal of the wireless control chip to output the high and low level control reference resistors and capacitors to obtain the first charging and discharging time is specifically: controlling the first control end of the wireless control chip to output high power The capacitor is charged by the reference resistor and starts timing; when the wireless control chip detects that the third control terminal is high, the first control terminal of the control wireless control chip outputs a low level to discharge the capacitor through the reference resistor; When the wireless control chip detects that the third control terminal changes from a high level to a low level, the timing is stopped to obtain a first charging and discharging time.
  • the method further includes: configuring the first control end to be an output mode, the second control end, and the third The control terminal is in an input mode; the first control terminal of the control wireless control chip outputs a low level and maintains the first predetermined time.
  • the step of controlling the thermistor and the capacitor to perform the charging and discharging operation to obtain the second charging and discharging time corresponding to the first charging and discharging time is specifically: controlling the second control end of the wireless control chip to output a high level to pass the thermal The resistor charges the capacitor and starts timing; when the wireless control chip detects that the third control terminal is high, the second control terminal of the control wireless control chip outputs a low level to discharge the capacitor through the thermistor; when the wireless control When the chip detects that the third control terminal changes from a high level to a low level, the timing is stopped to obtain a second charging and discharging time.
  • the method further comprises: configuring the second control end to be an output mode, the first control end and the first The third control terminal is an input mode; the second control terminal of the control wireless control chip outputs a low level and maintains a second predetermined time.
  • the plurality of sample temperatures are set in the reference thermostat, so that the thermistor is in the sample temperature, and the wireless control chip acquires the second time ratio corresponding to the sample temperature, which is recorded as the sample time ratio, wherein the plurality of sample temperatures and The corresponding sample time ratio forms a sample database.
  • the invention has the beneficial effects that the electronic thermometer and the control method thereof of the invention pass the first control terminal of the wireless control chip to output the high and low level control reference resistors and capacitors for charging and discharging operations to obtain the first charging and discharging time;
  • the second control terminal time-sharing output high and low level control the thermistor and the capacitor performs a charge and discharge operation to obtain a second charge and discharge time corresponding to the first charge and discharge time; and repeats the above two steps by a predetermined number of times to obtain more a first charging and discharging time and a second charging and discharging time; obtaining a ratio of each first charging and discharging time to a corresponding second charging and discharging value, and obtaining an average value of each ratio, which is recorded as a second time ratio;
  • the two time ratios are matched to obtain the temperature around the thermistor.
  • the electronic thermometer of the present invention can measure temperature without using an analog-to-digital converter and a voltage regulator, and consumes less power.
  • using the ratio of the first charge and discharge time to the second charge and discharge time Measuring the temperature eliminates many error factors and allows for a more accurate measurement of the temperature.
  • FIG. 1 is a schematic diagram showing the circuit structure of an electronic thermometer according to an embodiment of the present invention.
  • FIG. 2 is a flow chart showing a method of controlling an electronic thermometer according to a first embodiment of the present invention
  • Figure 3 is a flow chart of obtaining the first charge and discharge time in Figure 2;
  • Figure 4 is a flow chart of obtaining the second charge and discharge time in Figure 2;
  • Figure 5 is a waveform diagram of capacitor charging and discharging in Figures 3 and 4;
  • Figure 6 is a flow chart showing the temperature around the thermistor of Figure 2;
  • FIG. 7 is a flow chart showing a method of controlling an electronic thermometer according to a second embodiment of the present invention.
  • Figure 8 is a flow chart showing a method of controlling an electronic thermometer according to a third embodiment of the present invention.
  • Fig. 9 is a flow chart showing a method of controlling an electronic thermometer according to a fourth embodiment of the present invention.
  • the electronic thermometer includes a wireless control chip 1, a reference resistor 2, a thermistor 3, a capacitor 4, an antenna 5, a battery 6, and a switch 7.
  • the wireless control chip 4 includes a first control terminal PIO1, a second control terminal PIO2, and a third control terminal PIO3.
  • the first control terminal PIO1 of the wireless control chip 1 is connected to one end of the reference resistor 2
  • the second control terminal PIO2 is connected to one end of the thermistor 3, the other end of the reference resistor 2, the other end of the thermistor 3 and the capacitor 4
  • One end is connected, the other end of the capacitor 4 is grounded
  • the third control terminal PIO3 is connected to the common node of the reference resistor 2, the thermistor 3 and the capacitor 4.
  • the wireless control chip 4 performs charging and discharging operations by alternately controlling the reference resistor 2 and the capacitor 4, and charging and discharging operations of the thermistor 3 and the capacitor 4 to obtain the temperature around the thermistor.
  • the electronic thermometer further comprises an antenna 5, and the antenna 5 is connected to the wireless control chip 1 for wirelessly transmitting the temperature obtained by the wireless control chip 1.
  • the electronic thermometer further comprises a battery 6 and a switch 7, which is connected to the wireless control chip 4 via a switch 7.
  • the operation of powering on or off the wireless control chip 4 is controlled by the opening or closing of the switch 7.
  • the on/off of the electronic thermometer can be realized by the opening or closing of the switch 7.
  • FIG. 2 is a flow chart showing a method of controlling an electronic thermometer according to a first embodiment of the present invention, which is based on the electronic thermometer shown in FIG. 1. It should be noted that the method of the present invention is not limited to the sequence of the flow shown in FIG. 2 if substantially the same result is obtained. As shown in FIG. 2, the method includes the following steps:
  • Step S10 performing a charge and discharge operation by the first control terminal of the wireless control chip to output a high and low level control reference resistor and a capacitor to obtain a first charge and discharge time.
  • step S10 the first control terminal of the wireless control chip outputs a high and low level control reference resistor and a capacitor to generate a reference charge and discharge process, and performs reference timing to obtain a reference charge and discharge time, that is, a first charge and discharge time.
  • FIG. 3 is a flow chart of obtaining the first charging and discharging time in FIG. 2. As shown in FIG. 3, the steps of obtaining the first charging and discharging time include:
  • Step S101 The first control terminal, the second control terminal, and the third control terminal of the wireless control chip are configured to be in a no-pull mode.
  • step S101 since the first control terminal, the second control terminal, and the third of the wireless control chip are GPIO (General Purpose Input Output), the usage mode of the wireless control chip needs to be configured before use. In this embodiment, it is configured in a pullless mode.
  • GPIO General Purpose Input Output
  • Step S102 configuring the first control end to be an output mode, and the second control end and the third control end are an input mode.
  • step S102 configuring the first control terminal to be an output mode to apply or remove power to the reference resistor
  • the voltage is such that the RC integrating circuit composed of the reference resistor and the capacitor realizes a charge and discharge operation.
  • the third control terminal is configured to be in an input mode to detect the voltage across the capacitor during charging and discharging.
  • Step S103 Control the first control terminal to output a low level and maintain the first predetermined time.
  • step S103 before the first charging and discharging time is acquired, the first control terminal is controlled to output a low level and maintained for a first predetermined time, so that the stored charge on the capacitor is completely released, thereby ensuring acquisition of the first charging and discharging time. The accuracy. After the first predetermined time, the voltage across the capacitor is close to zero volts, and the logic level of the third control terminal acquired by the wireless control chip is low.
  • the third control terminal is a general-purpose input/output port.
  • the wireless control chip reads the third.
  • the logic level of the control terminal is high level.
  • the read logic level is low level, wherein VIL is less than VIH, VIL and VIH specific values are selected by the selected wireless control chip. to make sure.
  • Step S104 Control the first control terminal to output a high level to charge the capacitor through the reference resistor and start timing.
  • step S104 the timing is started while the first control terminal outputs the high level signal, that is, the start time of the first charging and discharging time, that is, the starting time at which the first control terminal outputs the high level signal.
  • the capacitor After the first control terminal outputs a high level signal, that is, after applying a voltage to the reference resistor, the capacitor starts to charge, and the voltage across the capacitor rises exponentially. Wherein, as the voltage across the capacitor gradually rises from near zero volts, when the voltage rises to VIH, the logic level of the third control terminal obtained by the wireless control chip changes from a low level to a high level.
  • Step S105 When the wireless control chip detects that the third control terminal is at a high level, the first control terminal is controlled to output a low level to discharge the capacitor through the reference resistor.
  • step S105 when the wireless control chip detects that the third control terminal is at a high level, the first control terminal outputs a low level signal to cause the capacitor to start discharging, and the voltage across the capacitor decreases exponentially. As the voltage across the capacitor decreases, when the voltage drops to VIL, the logic level of the third control terminal read by the wireless control chip changes from a high level to a low level.
  • Step S106 When the wireless control chip detects that the third control terminal changes from a high level to a low level, the timing is stopped to obtain a first charging and discharging time.
  • step S106 when the wireless control chip detects that the third control terminal changes from a high level to a low level, the timing is stopped, that is, the end time of the first charging and discharging time, that is, the time when the capacitor is discharged until the voltage becomes VIL. .
  • the logic level of the digital circuit is directly used as the criterion of the time point, and the comparator of the analog circuit is not used as the criterion of the time point, so that the circuit of the electronic thermometer is simpler, and the electronic thermometer is further reduced. Cost and power consumption.
  • the first charging and discharging time includes both the charging time of the capacitor and the discharging time of the capacitor, and has higher resolution and temperature accuracy than the method of calculating the temperature using only the charging time or only using the discharging time. high.
  • Step S11 The second control terminal of the wireless control chip outputs a high and low level control the thermistor and the capacitor to perform a charge and discharge operation to obtain a second charge and discharge time corresponding to the first charge and discharge time.
  • step S11 the second control terminal of the wireless control chip outputs a high and low level control the thermistor and the capacitor to generate a measured charging and discharging process, and performs measurement timing to obtain a measured charging and discharging time, that is, a second charging and discharging. time.
  • FIG. 4 is a flow chart of obtaining the second charging and discharging time in FIG. 2.
  • the step of acquiring the second charging and discharging time includes:
  • Step S111 The second control terminal is configured to be in an output mode, and the first control terminal and the third control terminal are in an input mode.
  • Step S112 Control the second control terminal to output a low level and maintain the second predetermined time.
  • Step S113 Control the second control terminal to output a high level to charge the capacitor through the thermistor and start timing.
  • Step S114 When the wireless control chip detects that the third control terminal is at a high level, the second control terminal is controlled to output a low level to discharge the capacitor through the thermistor.
  • Step S115 When the wireless control chip detects that the third control terminal changes from a high level to a low level, the timing is stopped to obtain a second charging and discharging time.
  • the step of acquiring the second charging and discharging time shown in FIG. 4 is similar to the step of acquiring the first charging and discharging time shown in FIG. 3, and the main difference is that: in FIG. 4, the second control terminal is applied to the thermistor or The voltage is removed, so that the RC integrating circuit composed of the thermistor and the capacitor realizes the charging and discharging operation. In FIG. 3, a voltage is applied or removed to the reference resistor through the first control terminal, so that the RC integration circuit composed of the reference resistor and the capacitor realizes a charge and discharge operation.
  • the second predetermined time in FIG. 4 and the first predetermined time in FIG. 3 may be the same or different.
  • step S111 is started.
  • FIG. 5 is a waveform diagram of capacitor charging and discharging in FIG. 3 and FIG. As shown in FIG. 5, the T axis represents time and the V axis represents voltage.
  • TREST1 is a first predetermined time for the first control terminal to output a low level
  • TREST2 is a second predetermined time for the second control terminal to output a low level
  • TREF is a first charging and discharging time
  • TMEA is a second charging and discharging time.
  • the voltage VOL corresponds to the output low level of the first control terminal or the second control terminal, which is close to zero volt;
  • the voltage VIH corresponds to the minimum voltage value of the logic high level of the third control terminal, that is, the input high voltage of the third control terminal.
  • the voltage VIL corresponds to the maximum voltage value of the logic low level of the third control terminal, that is, the input low level of the third control terminal.
  • Step S12 performing a predetermined number of repeated operations on the above two steps to obtain a plurality of first charging and discharging times and second charging and discharging times.
  • step S12 after performing a predetermined number of repetition operations on steps S10 and S11, since a set of first charge and discharge times and a second charge and discharge time are obtained every time steps S10 and S11 are performed, a predetermined number of steps S10 and After the repeated operation of step S11, a first number of sets of first charge and discharge times and a second charge and discharge time are obtained.
  • Step S13 Obtain a ratio of each first charging and discharging time to a corresponding second charging and discharging time, and record the first time ratio.
  • step S13 a ratio operation, that is, a division operation, is performed on each of the first charge and discharge times and the corresponding second charge and discharge time, respectively, to obtain a plurality of first time ratios.
  • the calculated first time ratio is subjected to the amplification operation and then the subsequent operation is performed.
  • the magnification of the first time ratio is determined according to the requirements of the body temperature accuracy. For example, when the magnification is 10000 times, the corresponding low temperature error is 0.004 ° C, and the high temperature error is 0.002 ° C.
  • Step S14 Acquire an average value of each first time ratio, and record it as a second time ratio.
  • the second time ratio is the average of the first time ratio after 10,000 times magnification. It should be understood by those skilled in the art that the multiple of the magnification is 10000 times, which is only an example, and the invention is not limited thereto.
  • Step S15 Matching the second time ratio in the sample database to obtain the temperature around the thermistor, wherein the sample database includes the sample temperature and a sample time ratio corresponding to the sample temperature.
  • step S15 the second time ratio is first matched in the sample database to obtain a sample time ratio corresponding to the second time ratio, and then the corresponding sample temperature is obtained in the sample database according to the sample time ratio, and finally calculated according to the sample temperature.
  • the temperature around the thermistor is first matched in the sample database to obtain a sample time ratio corresponding to the second time ratio, and then the corresponding sample temperature is obtained in the sample database according to the sample time ratio, and finally calculated according to the sample temperature. The temperature around the thermistor.
  • the temperature around the thermistor can be obtained according to the following formula:
  • 100t 100 (10000k - 10000kn) / (10000k (n + 1) - 10000kn) + 100tn.
  • FIG. 6 is a flow chart of obtaining the temperature around the thermistor in FIG. As shown in FIG. 6, the steps of obtaining the temperature around the thermistor include:
  • Step S151 Obtain two sample time ratios adjacent to the second time ratio in the sample database, and record the first sample time ratio and the second sample time ratio.
  • step S151 comparing the second time ratio 10000k with the sample time ratio in the sample time library, obtaining the two sample time ratios closest to the second time ratio, respectively recorded as the first sample time ratio 10000kn and the first
  • the second sample time ratio is 10000 k(n+1)
  • the first sample time ratio is 10000 kn is smaller than the second time ratio 10000 k
  • the second time ratio 10000 k is smaller than the second sample time ratio 10000 k (n+1).
  • the sample time ratio stored in the sample database is 10,000 times the sample time ratio after the amplification.
  • Step S152 Acquire a difference between the second time ratio and the first sample time ratio, and record it as the first difference value.
  • step S152 the first difference is (10000k - 10000kn).
  • Step S153 Acquire a difference between the time ratio of the second sample and the time ratio of the first sample, and record it as the second difference.
  • step S153 the second difference is (10000k(n+1) - 10000kn).
  • Step S154 The temperature around the thermistor is obtained by summing the ratio of the first difference value to the second difference value and the sample temperature corresponding to the first sample time ratio.
  • step S154 first, a ratio of the first difference value to the second difference value is calculated, that is, (10000k-10000kn)/(10000k(n+1)-10000kn), and then the ratio is corresponding to the first sample time 10000kn.
  • an integer operation is used, and the calculated ratio of the first difference value to the second difference value is subjected to an amplification operation, and then a subsequent summation operation is performed.
  • the magnification of the ratio of the first difference value to the second difference value is 100 times
  • the sample temperature stored in the sample database is the sample temperature 100tn after performing 100 times magnification, and therefore, the heat after being amplified by 100 times
  • obtaining the temperature around the thermistor can also be performed by looking up the closest sample time ratio in the sample time library, using the closest sample time ratio corresponding to the sample temperature as the temperature around the thermistor, This way, you can simplify the process of calculation and increase the speed of calculation.
  • Fig. 7 is a flow chart showing a method of controlling an electronic thermometer according to a second embodiment of the present invention, which is based on the electronic thermometer shown in Fig. 1. It should be noted that the method of the present invention is not limited to the sequence of processes shown in FIG. 7 if substantially the same result is obtained.
  • FIG. 7 As shown in FIG. 7, the main differences between the first embodiment in FIG. 7 and FIG. 2 are as follows:
  • FIG. 7 further includes the following steps:
  • Step S701 Acquire a ratio of each first charging and discharging time to a corresponding second charging and discharging time, and record it as a third time ratio.
  • the third time ratio is a third time ratio after performing the amplification operation, and the amplification factor is specifically 10000 times.
  • Step S702 Acquire an average value of each third time ratio, and record it as a first average value.
  • the first mean value is an average value of each of the third time ratios after the magnification is 10000 times.
  • Step S703 Acquire an absolute value of the difference between each third time ratio and the first mean value, and record it as the first absolute value.
  • Step S704 Delete the first charging and discharging time and the second charging and discharging time corresponding to the third time ratio in which the first absolute value is not within the first predetermined range.
  • the first predetermined range is determined according to the requirements of the body temperature accuracy.
  • the first predetermined range is less than or equal to 100, that is, if the first absolute value exceeds 100, the first charging and discharging time corresponding to the first absolute value and the second charging and discharging time are deleted.
  • the error is 0.4 ° C corresponding to the low temperature, and 0.2 ° C when the temperature is high.
  • the first charging and discharging time and the second charging and discharging time corresponding to the ratio of the first charging and discharging time and the second charging and discharging time including the coarse error can be eliminated. Therefore, the fluctuation of the result caused by the random interference can be reduced, the accuracy of the subsequent calculation time ratio can be improved, and the accuracy of calculating the temperature around the thermistor can be further improved.
  • Fig. 8 is a flow chart showing a method of controlling an electronic thermometer according to a third embodiment of the present invention, which is based on the electronic thermometer shown in Fig. 1. It should be noted that if there are substantially the same results, the method of the present invention is not limited to the sequence of processes shown in FIG.
  • FIG. 8 further includes the following steps:
  • Step S801 Acquire an average value of each first charging and discharging time, and record it as a second average value.
  • Step S802 Acquire an absolute value of a difference between each first charging and discharging time and a second average value, and record it as a second absolute value.
  • Step S803 Delete the first charging and discharging time in which the second absolute value is not within the second predetermined range and the corresponding second charging and discharging time.
  • the second predetermined range is determined according to the requirements of the body temperature accuracy.
  • the second predetermined range is less than or equal to 50 microseconds, that is, if the second absolute value exceeds 50 microseconds, the first charging and discharging time and the corresponding second charging and discharging time are deleted.
  • the error is 0.25° C. at the low temperature and 0.6° C. at the high temperature.
  • the first charging and discharging time containing the coarse error and the corresponding second charging and discharging time can be eliminated, thereby reducing the fluctuation of the result caused by the random interference and improving the subsequent calculation.
  • the accuracy of the time ratio further improves the accuracy of calculating the temperature around the thermistor.
  • Fig. 9 is a flow chart showing a method of controlling an electronic thermometer according to a fourth embodiment of the present invention, which is based on the electronic thermometer shown in Fig. 1. It should be noted that if there are substantially the same results, the method of the present invention is not limited to the sequence of processes shown in FIG.
  • FIG. 9 further includes the following steps:
  • Step S901 Acquire an average value of each second charging and discharging time, and record it as a third average value.
  • Step S902 Acquire an absolute value of a difference between each second charging and discharging time and a third average value, and record it as a third absolute value.
  • Step S903 deleting the second charging and discharging time in which the third absolute value is not within the third predetermined range and the corresponding first charging and discharging time.
  • the third predetermined range is determined according to the requirements of the body temperature accuracy.
  • the third predetermined range is less than or equal to 50 microseconds, that is, if the third absolute value exceeds 50 microseconds, the second charging and discharging time and the corresponding first charging and discharging time are deleted.
  • the error is 0.25 ° C corresponding to low temperature and 0.6 ° C at high temperature.
  • the second charging and discharging time including the coarse error and the corresponding first charging and discharging time can be eliminated, thereby reducing the fluctuation of the result caused by the random interference and improving the subsequent calculation.
  • Time ratio accuracy further improve the calculation of the thermistor week The accuracy of the temperature of the side.
  • Fig. 10 is a flow chart showing a method of controlling an electronic thermometer according to a fourth embodiment of the present invention, which is based on the electronic thermometer shown in Fig. 1. It should be noted that if there are substantially the same results, the method of the present invention is not limited to the sequence of processes shown in FIG.
  • FIG. 10 As shown in FIG. 10, the main differences between the first embodiment in FIG. 10 and FIG. 2 are as follows:
  • FIG. 10 further includes the following steps:
  • Step S1001 Obtain a ratio of the first charging and discharging time to the corresponding second charging and discharging time, and record it as a third time ratio;
  • Step S1002 Acquire an average value of each third time ratio, and record it as a first mean value
  • Step S1003 Acquire an absolute value of a difference between each third time ratio and a first mean value, and record it as a first absolute value;
  • Step S1004 Delete the first charging and discharging time and the second charging and discharging time corresponding to the third time ratio in which the first absolute value is not within the first predetermined range.
  • Step S1005 Obtain an average value of each first charging and discharging time, and record it as a second average value
  • Step S1006 Obtain an absolute value of a difference between each first charging and discharging time and a second average value, and record it as a second absolute value;
  • Step S1007 deleting the first charging and discharging time in which the second absolute value is not within the second predetermined range and the corresponding second charging and discharging time.
  • Step S1008 Acquire an average value of each second charging and discharging time, and record it as a third average value
  • Step S1009 Obtain an absolute value of a difference between each second charging and discharging time and a third average value, and record it as a third absolute value;
  • Step S1010 Delete the second charging and discharging time in which the third absolute value is not within the third predetermined range and the corresponding first charging and discharging time.
  • the content may be coarse.
  • the first charging and discharging time and the second charging and discharging time corresponding to the ratio of the first charging/discharging time of the error to the second charging and discharging time, the first charging and discharging time including the coarse error, and the corresponding second charging and discharging time, and the coarse charging error
  • the second charging and discharging time and the corresponding first charging and discharging time are all eliminated, thereby reducing the fluctuation of the result caused by the random interference, improving the accuracy of the subsequent calculation time ratio, and further improving the accuracy of calculating the body temperature around the thermistor.
  • the control method in the fourth embodiment can be performed.
  • the operation was repeated to obtain a plurality of temperatures, and then the plurality of temperatures were averaged and then measured as an electronic thermometer.
  • the sample time ratio and the corresponding sample temperature in the sample database of the present invention can also be obtained according to the control method of the first embodiment, the second embodiment, the third embodiment or the fourth embodiment of the present invention.
  • a plurality of sample temperatures are set with a reference thermostat to place the thermistor in the sample temperature.
  • the wireless control chip first runs the control method in the first embodiment, the second embodiment, the third embodiment, or the fourth embodiment to obtain a second time ratio corresponding to the sample temperature, that is, a sample time ratio, and then the wireless control chip
  • the sample time ratio and the corresponding sample temperature are stored in the sample database.
  • the wireless control chip operates the control method in the fourth embodiment to acquire the sample time ratio.
  • the invention has the beneficial effects that the electronic thermometer and the control method thereof of the invention pass the first control terminal of the wireless control chip to output the high and low level control reference resistors and capacitors for charging and discharging operations to obtain the first charging and discharging time;
  • the second control terminal time-sharing output high and low level control the thermistor and the capacitor performs a charge and discharge operation to obtain a second charge and discharge time corresponding to the first charge and discharge time; and repeats the above two steps by a predetermined number of times to obtain more a first charging and discharging time and a second charging and discharging time; obtaining a ratio of each first charging and discharging time to a corresponding second charging and discharging value, and obtaining an average value of each ratio, which is recorded as a second time ratio;
  • the two time ratios are matched to obtain the temperature around the thermistor.
  • the electronic thermometer of the present invention can measure temperature without using an analog-to-digital converter and a voltage regulator, and consumes less power.
  • using the ratio of the first charge and discharge time to the second charge and discharge time Measuring the temperature eliminates many error factors and allows for a more accurate measurement of the temperature.

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Abstract

一种电子体温计，包括无线控制芯片（1）、热敏电阻（3）、参考电阻（2）和电容（4）；无线控制芯片（1）包括第一控制端（PIO1）、第二控制端（PIO2）和第三控制端（PIO3），第一控制端（PIO1）与参考电阻（2）的一端连接，第二控制端（PIO2）与热敏电阻（3）的一端连接，参考电阻（2）的另一端、热敏电阻（3）的另一端分别与电容（4）的一端连接，电容（4）的另一端接地，第三控制端（PIO3）连接于参考电阻（2）、热敏电阻（3）和电容（4）的公共节点处。一种电子体温计控制方法，其中，无线控制芯片（1）通过交替控制参考电阻（2）和电容（4）进行充放电操作以及热敏电阻（3）和电容（4）进行充放电操作以获取热敏电阻（3）周边的温度。通过上述方式，能够以较低成本，较低功耗实现高精度的温度测量。

Description

一种电子体温计及其控制方法 【技术领域】
本发明涉及医疗卫生领域，特别是涉及一种电子体温计及其控制方法。
【背景技术】
在电子体温计领域，一直以来通过对伴随温度变化的热敏电阻的阻值变化进行测定来获得温度测量值。具体来说，通过热敏电阻将温度变化转化为电压或电流的变化，然后经放大和模数转换，最后经通用微处理芯片运算处理计算出体温。采用该种方法，由于测量的精度由热敏电阻的精度以及电源电压的精度来决定，精度较低。同时，由于体温获取的过程中需要使用模数转换器和电压调节器，功耗较大。
【发明内容】
本发明主要解决的技术问题是提供一种电子体温计及其控制方法，能够以较低成本、较低功耗实现高精度的体温测量。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种电子体温计，该电子体温计包括无线控制芯片、热敏电阻、参考电阻和电容；无线控制芯片包括第一控制端、第二控制端和第三控制端；第一控制端与参考电阻的一端连接，第二控制端与热敏电阻的一端连接，参考电阻的另一端、热敏电阻的另一端分别与电容的一端连接，电容的另一端接地，第三控制端连接于参考电阻、热敏电阻和电容的公共节点处；其中，无线控制芯片通过交替控制参考电阻和电容进行充放电操作以及热敏电阻和电容进行充放电操作以获取热敏电阻周边的温度。
其中，电子体温计进一步包括天线，天线与无线控制芯片连接，用以将无线控制芯片获得的热敏电阻周边的温度通过无线方式发送出去。
其中，电子体温计进一步包括电池和开关，电池通过开关与无线控制芯片连接，其中，通过开关打开或闭合以控制无线控制芯片上电或断电。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种电子体温计的控制方法，该方法包括：通过无线控制芯片的第一控制端分时输出高低电平控制参考电阻和电容进行充放电操作以获取第一充放电时间；通过无线控制芯片的第二控制端分时输出高低电平控制热敏电阻和电容进行充放电操作以获取与第一充放电时间对应的第二充放电时间；对上述两个步骤进行预定次数的重复操作以获取多个第一充放电时间和第二充放电时间；获取各第一充放电时间与对应的第二充放电时间的比值，记为第一时间比；获取各第一时间比的均值，记为第二时间比；在样本数据库中对第二时间比进行匹配以获取热敏电阻周边的温度，其中，样本数据库包括样本温度以及与样本温度对应的样本时间比。
其中，在样本数据库中对第二时间比进行匹配以获取热敏电阻周边的温度的步骤具体为：在样本数据库中获取与第二时间比相邻的两个样本时间比，记为第一样本时间比和第二样本时间比，其中，第一样本时间比小于第二样本时间比；获取第二时间比与第一样本时间比的差值，记为第一差值；获取第二样本时间比与第一样本时间比的差值，记为第二差值；对第一差值与第二差值的比值和第一样本时间比对应的样本温度求和即可得到热敏电阻周边的温度。
其中，获取各第一充放电时间与对应的第二充放电时间的比值的步骤之前，该方法进一步包括步骤：获取各第一充放电时间与对应的第二充放电时间的比值，记为第三时间比；获取各第三时间比的均值，记为第一均值；获取各第三时间比与第一均值的差值的绝对值，记为第一绝对值；删除第一绝对值不在第一预定范围内的第三时间比对应的第一充放电时间和第二充放电时间。
其中，获取各第一充放电时间与对应的第二充放电时间的比值的步骤之前，该方法进一步包括步骤：获取各第一充放电时间的均值，记为第二均值；获取各第一充放电时间与第二均值的差值的绝对值，记为第二绝对值；删除第二绝 对值不在第二预定范围内的第一充放电时间以及对应的第二充放电时间。
其中，获取各第一充放电时间与对应的第二充放电时间的比值的步骤之前，该方法进一步包括步骤：获取各第二充放电时间的均值，记为第三均值；获取各第二充放电时间与第三均值的差值的绝对值，记为第三绝对值；删除第三绝对值不在第三预定范围内的第二充放电时间以及对应的第一充放电时间。
其中，通过无线控制芯片的第一控制端分时输出高低电平控制参考电阻和电容进行充放电操作以获取第一充放电时间的步骤具体为：控制无线控制芯片的第一控制端输出高电平以通过参考电阻对电容进行充电并启动计时；当无线控制芯片检测到第三控制端为高电平时，控制无线控制芯片的第一控制端输出低电平以使电容通过参考电阻进行放电；当无线控制芯片检测到第三控制端由高电平变为低电平时，停止计时以获得第一充放电时间。
其中，控制无线控制芯片的第一控制端输出高电平以通过参考电阻对电容进行充电并启动计时的步骤之前，该方法进一步包括：配置第一控制端为输出模式，第二控制端和第三控制端为输入模式；控制无线控制芯片的第一控制端输出低电平并维持第一预定时间。
其中，控制热敏电阻和电容进行充放电操作以获取与第一充放电时间相对应的第二充放电时间的步骤具体为：控制无线控制芯片的第二控制端输出高电平以通过热敏电阻对电容进行充电并启动计时；当无线控制芯片检测到第三控制端为高电平时，控制无线控制芯片的第二控制端输出低电平以使电容通过热敏电阻进行放电；当无线控制芯片检测到第三控制端由高电平变为低电平时，停止计时以获得第二充放电时间。
其中，控制无线控制芯片的第二控制端输出高电平以通过热敏电阻对电容进行充电并启动计时的步骤之前，该方法进一步包括：配置第二控制端为输出模式，第一控制端和第三控制端为输入模式；控制无线控制芯片的第二控制端输出低电平并维持第二预定时间。
其中，在参考恒温槽分时设置多个样本温度，使热敏电阻处于样本温度中， 无线控制芯片获取与样本温度对应的第二时间比，记为样本时间比，其中，多个样本温度与对应的样本时间比形成样本数据库。
为解决上述技术问题，本发明采用的又一个技术方案是：提供一种电子体温计的控制方法，该控制方法包括：通过无线控制芯片的第一控制端分时输出高低电平控制参考电阻和电容进行充放电操作以获取第一充放电时间；通过无线控制芯片的第二控制端分时输出高低电平控制热敏电阻和电容进行充放电操作以获取与第一充放电时间对应的第二充放电时间；对上述两个步骤进行预定次数的重复操作以获取多个第一充放电时间和第二充放电时间；获取各第一充放电时间与对应的第二充放电时间的比值，记为第三时间比；获取各第三时间比的均值，记为第一均值；获取各第三时间比与第一均值的差值的绝对值，记为第一绝对值；删除第一绝对值不在第一预定范围内的第三时间比对应的第一充放电时间和第二充放电时间；获取各第一充放电时间的均值，记为第二均值；获取各第一充放电时间与第二均值的差值的绝对值，记为第二绝对值；删除第二绝对值不在第二预定范围内的第一充放电时间以及对应的第二充放电时间；获取各第二充放电时间的均值，记为第三均值；获取各第二充放电时间与第三均值的差值的绝对值，记为第三绝对值；删除第三绝对值不在第三预定范围内的第二充放电时间以及对应的第一充放电时间；获取各第一充放电时间与对应的第二充放电时间的比值，记为第一时间比；获取各第一时间比的均值，记为第二时间比；在样本数据库中对第二时间比进行匹配以获取热敏电阻周边的温度，其中，样本数据库包括样本温度以及与样本温度对应的样本时间比。
其中，通过无线控制芯片的第一控制端分时输出高低电平控制参考电阻和电容进行充放电操作以获取第一充放电时间的步骤具体为：控制无线控制芯片的第一控制端输出高电平以通过参考电阻对电容进行充电并启动计时；当无线控制芯片检测到第三控制端为高电平时，控制无线控制芯片的第一控制端输出低电平以使电容通过参考电阻进行放电；当无线控制芯片检测到第三控制端由高电平变为低电平时，停止计时以获得第一充放电时间。
其中，控制无线控制芯片的第一控制端输出高电平以通过参考电阻对电容进行充电并启动计时的步骤之前，方法进一步包括：配置第一控制端为输出模式，第二控制端和第三控制端为输入模式；控制无线控制芯片的第一控制端输出低电平并维持第一预定时间。
其中，控制热敏电阻和电容进行充放电操作以获取与第一充放电时间相对应的第二充放电时间的步骤具体为：控制无线控制芯片的第二控制端输出高电平以通过热敏电阻对电容进行充电并启动计时；当无线控制芯片检测到第三控制端为高电平时，控制无线控制芯片的第二控制端输出低电平以使电容通过热敏电阻进行放电；当无线控制芯片检测到第三控制端由高电平变为低电平时，停止计时以获得第二充放电时间。
其中，控制无线控制芯片的第二控制端输出高电平以通过热敏电阻对电容进行充电并启动计时的步骤之前，方法进一步包括：配置第二控制端为输出模式，第一控制端和第三控制端为输入模式；控制无线控制芯片的第二控制端输出低电平并维持第二预定时间。
其中，在参考恒温槽分时设置多个样本温度，使热敏电阻处于样本温度中，无线控制芯片获取与样本温度对应的第二时间比，记为样本时间比，其中，多个样本温度与对应的样本时间比形成样本数据库。
本发明的有益效果是：本发明的电子体温计及其控制方法通过无线控制芯片的第一控制端分时输出高低电平控制参考电阻和电容进行充放电操作以获取第一充放电时间；通过第二控制端分时输出高低电平控制热敏电阻和电容进行充放电操作以获取与第一充放电时间相对应的第二充放电时间；对上述两个步骤进行预定次数的重复操作以获取多个第一充放电时间和第二充放电时间；求取各第一充放电时间与对应的第二充放电的比值后获取各比值的均值，记为第二时间比；在样本数据库中对第二时间比进行匹配以获取热敏电阻周边的温度。通过上述方式，本发明的电子体温计不需要使用模数转换器和电压调节器即可测量温度，功耗较小。同时，使用第一充放电时间与第二充放电时间的比值来 测量温度，抵消掉了很多误差因素，能得到的更高精度的测量温度。
【附图说明】
图1是本发明实施例的电子体温计的电路结构示意图；
图2是本发明第一实施例电子体温计的控制方法的流程图；
图3是图2中获取第一充放电时间的流程图；
图4是图2中获取第二充放电时间的流程图；
图5是图3、图4中电容充放电的波形图；
图6是图2中获取热敏电阻周边的温度的流程图；
图7是本发明第二实施例电子体温计的控制方法的流程图；
图8是本发明第三实施例电子体温计的控制方法的流程图；
图9是本发明第四实施例电子体温计的控制方法的流程图。
【具体实施方式】
在说明书及权利要求书当中使用了某些词汇来指称特定的组件，所属领域中的技术人员应可理解，制造商可能会用不同的名词来称呼同样的组件。本说明书及权利要求书并不以名称的差异来作为区分组件的方式，而是以组件在功能上的差异来作为区分的基准。下面结合附图和实施例对本发明进行详细说明。
图1是本发明实施例的电子体温计的电路结构示意图。如图1所示，电子体温计包括无线控制芯片1、参考电阻2、热敏电阻3、电容4、天线5、电池6和开关7。其中，无线控制芯片4包括第一控制端PIO1，第二控制端PIO2和第三控制端PIO3。
无线控制芯片1的第一控制端PIO1与参考电阻2的一端连接，第二控制端PIO2与热敏电阻3的一端连接，参考电阻2的另一端、热敏电阻3的另一端与电容4的一端连接，电容4的另一端接地，第三控制端PIO3连接于参考电阻2、热敏电阻3和电容4的公共节点处。
其中，无线控制芯片4通过交替控制参考电阻2和电容4进行充放电操作以及热敏电阻3和电容4进行充放电操作来获取热敏电阻周边的温度。
优选地，电子体温计进一步包括天线5，天线5与无线控制芯片1连接，用于将无线控制芯片1获得的温度以无线的方式发送出去。
优选地，电子体温计进一步包括电池6和开关7，电池6通过开关7与无线控制芯片4连接。通过开关7的打开或闭合以控制对无线控制芯片4进行上电或断电的操作。换个角度来说，通过开关7的打开或闭合可以实现电子体温计的开关机。
图2是本发明第一实施例电子体温计的控制方法的流程图，该方法基于图1所示的电子体温计。需注意的是，若有实质上相同的结果，本发明的方法并不以图2所示的流程顺序为限。如图2所示，该方法包括如下步骤：
步骤S10：通过无线控制芯片的第一控制端分时输出高低电平控制参考电阻和电容进行充放电操作以获取第一充放电时间。
在步骤S10中，通过无线控制芯片的第一控制端分时输出高低电平控制参考电阻和电容产生参考的充放电过程，并进行参考计时以获取参考充放电时间，也即第一充放电时间。
请一并参考图3，图3是图2中获取第一充放电时间的流程图，如图3所示，获取第一充放电时间的步骤包括：
步骤S101：配置无线控制芯片的第一控制端、第二控制端和第三控制端为无拉模式。
在步骤S101中，由于无线控制芯片的第一控制端、第二控制端和第三为GPIO(General Purpose Input Output，通用输入/输出口)，在使用前，需要对其的使用模式进行配置。在本实施例中，将其配置为无拉模式。
步骤S102：配置第一控制端为输出模式，第二控制端和第三控制端为输入模式。
在步骤S102中，配置第一控制端为输出模式以向参考电阻施加或撤除电 压，从而使得参考电阻和电容组成的RC积分电路实现充放电操作。配置第三控制端为输入模式以检测在充放电过程中电容两端的电压。
步骤S103：控制第一控制端输出低电平并维持第一预定时间。
在步骤S103中，在获取第一充放电时间之前，控制第一控制端输出低电平并维持第一预定时间，以使得电容上已存储的电荷被完全释放，从而确保获取第一充放电时间的准确性。其中，经过第一预定时间后，电容两端的电压接近零伏，此时无线控制芯片获取到的第三控制端的逻辑电平为低电平。
本领域的技术人员可以理解，第三控制端为通用输入/输出口，当第三控制端被配置为输入模式后，当其输入的电压值大于VIH时，无线控制芯片读取到的第三控制端的逻辑电平为高电平，当输入的电压值小于VIL时，读取到的逻辑电平为低电平，其中，VIL小于VIH，VIL和VIH具体的数值由所选择的无线控制芯片来确定。
步骤S104：控制第一控制端输出高电平以通过参考电阻对电容进行充电并启动计时。
在步骤S104中，在第一控制端输出高电平信号的同时启动计时，也即第一充放电时间的起始时刻也即第一控制端输出高电平信号的起始时刻。
第一控制端输出高电平信号也即向参考电阻施加电压后，电容开始充电，电容两端的电压按照指数规律上升。其中，随着电容两端的电压从接近零伏逐步上升，当电压上升至VIH时，无线控制芯片获取到的第三控制端的逻辑电平由低电平变为高电平。
步骤S105：当无线控制芯片检测到第三控制端为高电平时，控制第一控制端输出低电平以使电容通过参考电阻进行放电。
在步骤S105中，当无线控制芯片检测到第三控制端为高电平后，第一控制端输出低电平信号以使电容开始放电，此时电容两端的电压按照指数规律下降。随着电容两端的电压降低，当电压下降到VIL时，无线控制芯片读取到的第三控制端的逻辑电平由高电平变为低电平。
步骤S106：当无线控制芯片检测到第三控制端由高电平变为低电平时，停止计时以获得第一充放电时间。
在步骤S106中，当无线控制芯片检测到第三控制端由高电平变为低电平的同时停止计时，也即第一充放电时间的结束时刻也即电容放电至电压变为VIL的时刻。在本实施例中，直接使用数字电路的逻辑电平作为时间点的判据，而不使用模拟电路的比较器作为时间点的判据，使得电子体温计的电路更加简单，进一步减低了电子体温计的成本和功耗。
另外，第一充放电时间既包括了电容的充电时间也包括可电容的放电时间，与仅仅使用充电时间或仅仅使用放电时间计算温度的方法相比，具有更高的分辨率，温度的精度更高。
步骤S11：通过无线控制芯片的第二控制端分时输出高低电平控制热敏电阻和电容进行充放电操作以获取与第一充放电时间相对应的第二充放电时间。
在步骤S11中，通过无线控制芯片的第二控制端分时输出高低电平控制热敏电阻和电容产生测量的充放电过程，并进行测量计时以获取测量充放电时间，也即第二充放电时间。
请一并参考图4，图4是图2中获取第二充放电时间的流程图，如图4所示，获取第二充放电时间的步骤包括：
步骤S111：配置第二控制端为输出模式，第一控制端和第三控制端为输入模式。
步骤S112：控制第二控制端输出低电平并维持第二预定时间。
步骤S113：控制第二控制端输出高电平以通过热敏电阻对电容进行充电并启动计时。
步骤S114：当无线控制芯片检测到第三控制端为高电平时，控制第二控制端输出低电平以使所述电容通过热敏电阻进行放电。
步骤S115：当无线控制芯片检测到第三控制端由高电平变为低电平时，停止计时以获得第二充放电时间。
其中，图4所示的获取第二充放电时间的步骤和图3所示的获取第一充放电时间的步骤类似，其主要区别在于：图4中通过第二控制端向热敏电阻施加或撤除电压，从而使得热敏电阻和电容组成的RC积分电路实现充放电操作。图3中通过第一控制端向参考电阻施加或撤除电压，从而使得参考电阻和电容组成的RC积分电路实现充放电操作。图4中的第二预定时间和图3中的第一预定时间可以相同也可以不相同。
另外，在本实施例中，当步骤S106执行完成后，开始执行步骤S111。
请一并参考图5，图5是图3、图4中电容充放电的波形图。如图5所示，T轴表示时间，V轴表示电压。
其中，TREST1为第一控制端输出低电平的第一预定时间，TREST2为第二控制端输出低电平的第二预定时间，TREF为第一充放电时间，TMEA为第二充放电时间。
其中，电压VOL对应第一控制端或第二控制端的输出低电平，其接近于零伏；电压VIH对应第三控制端的逻辑高电平的最小电压值，也即第三控制端的输入高电平；电压VIL对应第三控制端的逻辑低电平的最大电压值，也即第三控制端的输入低电平。
步骤S12：对上述两个步骤进行预定次数的重复操作以获取多个第一充放电时间和第二充放电时间。
在步骤S12中，对步骤S10和步骤S11进行预定次数的重复操作后，由于每执行一次步骤S10和步骤S11得到一组第一充放电时间和第二充放电时间，则执行预定次数步骤S10和步骤S11的重复操作后将得到预定次数组第一充放电时间和第二充放电时间。
步骤S13：获取各第一充放电时间与对应第二充放电时间的比值，记为第一时间比。
在步骤S13中，分别对各第一充放电时间和对应的第二充放电时间进行比值运算也即除法运算，得到多个第一时间比。
在本实施例中，优选地，为了免除实数运算而使用整数运算，对计算出的第一时间比进行放大运算后再执行后续的操作。其中，第一时间比的放大倍数根据体温精度的要求来进行确定，例如，当放大倍数为10000倍时，对应的低温时的误差为0.004℃，高温时的误差为0.002℃。
步骤S14：获取各第一时间比的均值，记为第二时间比。
在步骤S14中，第二时间比为放大10000倍后第一时间比的均值。本领域的技术人员可以理解，放大的倍数为10000倍仅为举例，本发明不以此为限。
步骤S15：在样本数据库中对第二时间比进行匹配以获取热敏电阻周边的温度，其中，样本数据库包括样本温度以及与样本温度对应的样本时间比。
在步骤S15中，首先在样本数据库中对第二时间比进行匹配以获取与第二时间比对应的样本时间比，接着根据样本时间比在样本数据库中获取对应的样本温度，最后根据样本温度计算热敏电阻周边的温度。
具体来说，热敏电阻周边的温度可根据如下公式进行获取：
100t＝100(10000k-10000kn)/(10000k(n+1)-10000kn)+100tn。
结合上述公式，并请一并参考图6，图6是图2中获取热敏电阻周边的温度的流程图。如图6所示，获取热敏电阻周边的温度步骤包括：
步骤S151：在样本数据库中获取与第二时间比相邻的两个样本时间比，记为第一样本时间比和第二样本时间比。
在步骤S151中，将第二时间比10000k与样本时间库中的样本时间比进行比较，获取与第二时间比最接近的两个样本时间比，分别记为第一样本时间比10000kn和第二样本时间比10000k(n+1)，第一样本时间比10000kn小于第二时间比10000k，第二时间比10000k小于第二样本时间比10000k(n+1)。其中，优选地，样本数据库中存储的样本时间比为10000倍放大后的样本时间比。
步骤S152：获取第二时间比与第一样本时间比的差值，记为第一差值。
在步骤S152中，第一差值为(10000k-10000kn)。
步骤S153：获取第二样本时间比与第一样本时间比的差值，记为第二差值。
在步骤S153中，第二差值为(10000k(n+1)-10000kn)。
步骤S154：对第一差值与第二差值的比值和第一样本时间比对应的样本温度求和即可得到热敏电阻周边的温度。
在步骤S154中，首先计算第一差值与第二差值的比值也即(10000k-10000kn)/(10000k(n+1)-10000kn)，接着将该比值与第一样本时间10000kn对应的样本温度tn进行求和即可得到热敏电阻周边的温度t，也即t＝(10000k-10000kn)/(10000k(n+1)-10000kn)+tn。
优选地，为了免除实数运算而使用整数运算，对计算出的第一差值与第二差值的比值进行放大运算后再执行后续的求和操作。
在本实施例中，第一差值与第二差值的比值的放大倍数为100倍，样本数据库中存储的样本温度为进行100倍放大后的样本温度100tn，因此，放大100倍后的热敏电阻周边的温度100t＝100(10000k-10000kn)/(10000k(n+1)-10000kn)+100tn。
在其它实施例中，获取热敏电阻周边的温度也可以通过在样本时间库中查找最接近的样本时间比，将最接近的样本时间比对应的样本温度作为热敏电阻周边的温度，采用这种方式，可以简化运算的过程、提高运算的速度。
图7是本发明第二实施例电子体温计的控制方法的流程图，该方法基于图1所示的电子体温计。需注意的是，若有实质上相同的结果，本发明的方法并不以图7所示的流程顺序为限。
如图7所示，图7与图2中第一实施例的主要区别在于：
在步骤S13之后，图7进一步包括以下步骤：
步骤S701：获取各第一充放电时间与对应第二充放电时间的比值，记为第三时间比。
在步骤S701中，第三时间比为进行放大运算后的第三时间比，放大倍数具体为10000倍。
步骤S702：获取各第三时间比的均值，记为第一均值。
在步骤S702中，第一均值为放大10000倍后各第三时间比的均值。
步骤S703：获取各第三时间比与第一均值的差值的绝对值，记为第一绝对值。
步骤S704：删除第一绝对值不在第一预定范围内的第三时间比对应的第一充放电时间和第二充放电时间。
在步骤S704中，第一预定范围根据体温精度的要求进行确定。在本实施例中，第一预定范围为小于等于100，也即若第一绝对值超出100，则删除第一绝对值对应的第一充放电时间以及第二充放电时间。其中第一预定范围小于等于100时，对应低温时误差0.4℃，高温时误差0.2℃。
本领域的技术人员可以理解，执行步骤S701～S704后，可以将含有粗大误差的第一充放电时间与第二充放电时间的比值对应的第一充放电时间和第二充放电时间剔除掉，从而可以减少随机干扰造成的结果波动，提高后续计算时间比的精度，进一步提高计算热敏电阻周边的温度的精度。
图7所示流程图的其他步骤均已揭露于图2中，为简洁起见，此处不再赘述。
图8是本发明第三实施例电子体温计的控制方法的流程图，该方法基于图1所示的电子体温计。需注意的是，若有实质上相同的结果，本发明的方法并不以图8所示的流程顺序为限。
如图8所示，图8与图2中第一实施例的主要区别在于：
在步骤S13之后，图8进一步包括以下步骤：
步骤S801：获取各第一充放电时间的均值，记为第二均值。
步骤S802：获取各第一充放电时间与第二均值的差值的绝对值，记为第二绝对值。
步骤S803：删除第二绝对值不在第二预定范围内的第一充放电时间以及对应的第二充放电时间。
在步骤S803中，第二预定范围根据体温精度的要求进行确定。在本实施例 中，第二预定范围为小于等于50微秒，也即若第二绝对值超出50微秒，则删除第一充放电时间以及对应的第二充放电时间。其中当第二预定范围小于等于50微秒时，对应低温时误差0.25℃，高温时误差0.6℃。
本领域的技术人员可以理解，执行步骤S801～S803后，可以将含有粗大误差的第一充放电时间以及对应的第二充放电时间剔除掉，从而可以减少随机干扰造成的结果波动，提高后续计算时间比的精度，进一步提高计算热敏电阻周边的温度的精度。
图8所示流程图的其他步骤均已揭露于图2中，为简洁起见，此处不再赘述。
图9是本发明第四实施例电子体温计的控制方法的流程图，该方法基于图1所示的电子体温计。需注意的是，若有实质上相同的结果，本发明的方法并不以图9所示的流程顺序为限。
如图9所示，图9与图2中第一实施例的主要区别在于：
在步骤S13之后，图9进一步包括以下步骤：
步骤S901：获取各第二充放电时间的均值，记为第三均值。
步骤S902：获取各第二充放电时间与第三均值的差值的绝对值，记为第三绝对值。
步骤S903：删除第三绝对值不在第三预定范围内的第二充放电时间以及对应的第一充放电时间。
在步骤S903中，第三预定范围根据体温精度的要求进行确定。在本实施例中，第三预定范围为小于等于50微秒，也即若第三绝对值超出50微秒，则删除第二充放电时间以及对应的第一充放电时间。其中当第三预定范围小于等于50微秒时，对应低温时误差0.25℃，高温时误差0.6℃。
本领域的技术人员可以理解，执行步骤S901～S903后，可以将含有粗大误差的第二充放电时间以及对应的第一充放电时间剔除掉，从而可以减少随机干扰造成的结果波动，提高后续计算时间比的精度，进一步提高计算热敏电阻周 边的温度的精度。
图9所示流程图的其他步骤均已揭露于图2中，为简洁起见，此处不再赘述。
图10是本发明第四实施例电子体温计的控制方法的流程图，该方法基于图1所示的电子体温计。需注意的是，若有实质上相同的结果，本发明的方法并不以图10所示的流程顺序为限。
如图10所示，图10与图2中第一实施例的主要区别在于：
在步骤S13之后，图10进一步包括以下步骤：
步骤S1001：获取第一充放电时间与对应的第二充放电时间的比值，记为第三时间比；
步骤S1002：获取各第三时间比的均值，记为第一均值；
步骤S1003：获取各第三时间比与第一均值的差值的绝对值，记为第一绝对值；
步骤S1004：删除第一绝对值不在第一预定范围内的第三时间比对应的第一充放电时间和第二充放电时间。
步骤S1005：获取各第一充放电时间的均值，记为第二均值；
步骤S1006：获取各第一充放电时间与第二均值的差值的绝对值，记为第二绝对值；
步骤S1007：删除第二绝对值不在第二预定范围内的第一充放电时间以及对应的第二充放电时间。
步骤S1008：获取各第二充放电时间的均值，记为第三均值；
步骤S1009：获取各第二充放电时间与第三均值的差值的绝对值，记为第三绝对值；
步骤S1010：删除第三绝对值不在第三预定范围内的第二充放电时间以及对应的第一充放电时间。
本领域的技术人员可以理解，执行步骤S1001～S1010后，可以将含有粗大 误差的第一充放电时间与第二充放电时间的比值对应的第一充放电时间和第二充放电时间，含有粗大误差的第一充放电时间以及对应的第二充放电时间，含有粗大误差的第二充放电时间以及对应的第一充放电时间全部剔除掉，从而可以减少随机干扰造成的结果波动，提高后续计算时间比的精度，进一步提高计算热敏电阻周边的体温的精度。
在实际应用中，由于根据本发明第四实施例的控制方法获取到的热敏电阻周边的温度的速度很快，为了减少随机干扰造成的结果波动，可以对第四实施例中的控制方法进行重复操作以得到多个温度，然后将多个温度进行平均后作为电子体温计测得的温度。
另外，本发明样本数据库中样本时间比和对应的样本温度也可根据本发明第一实施例、第二实施例、第三实施例或第四实施例的控制方法得到。具体来说，用参考恒温槽设定多个样本温度，使热敏电阻处于样本温度中。无线控制芯片首先运行第一实施例、第二实施例、第三实施例或第四实施例中的控制方法以获取与样本温度对应的第二时间比也即为样本时间比，随后无线控制芯片将样本时间比和对应的样本温度存入样本数据库中。优选地，由于第四实施例的控制方法具有更高的精度，在实际运用中，无线控制芯片运行第四实施例中的控制方法以获取样本时间比。
本发明的有益效果是：本发明的电子体温计及其控制方法通过无线控制芯片的第一控制端分时输出高低电平控制参考电阻和电容进行充放电操作以获取第一充放电时间；通过第二控制端分时输出高低电平控制热敏电阻和电容进行充放电操作以获取与第一充放电时间相对应的第二充放电时间；对上述两个步骤进行预定次数的重复操作以获取多个第一充放电时间和第二充放电时间；求取各第一充放电时间与对应的第二充放电的比值后获取各比值的均值，记为第二时间比；在样本数据库中对第二时间比进行匹配以获取热敏电阻周边的温度。通过上述方式，本发明的电子体温计不需要使用模数转换器和电压调节器即可测量温度，功耗较小。同时，使用第一充放电时间与第二充放电时间的比值来 测量温度，抵消掉了很多误差因素，能得到的更高精度的测量温度。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (19)

  1. 一种电子体温计，其中，所述电子体温计包括无线控制芯片、热敏电阻、参考电阻和电容；
    所述无线控制芯片包括第一控制端、第二控制端和第三控制端；
    所述第一控制端与所述参考电阻的一端连接，所述第二控制端与所述热敏电阻的一端连接，所述参考电阻的另一端、所述热敏电阻的另一端分别与所述电容的一端连接，所述电容的另一端接地，所述第三控制端连接于所述参考电阻、所述热敏电阻和所述电容的公共节点处；
    其中，所述无线控制芯片通过交替控制所述参考电阻和所述电容进行充放电操作以及所述热敏电阻和所述电容进行充放电操作以获取所述热敏电阻周边的温度。
  2. 根据权利要求1所述的电子体温计，其中，所述电子体温计进一步包括天线，所述天线与所述无线控制芯片连接，用以将所述无线控制芯片获得的所述热敏电阻周边的所述温度通过无线方式发送出去。
  3. 根据权利要求2所述的电子体温计，其中，所述电子体温计进一步包括电池和开关，所述电池通过所述开关与所述无线控制芯片连接，其中，通过所述开关打开或闭合以控制所述无线控制芯片上电或断电。
  4. 一种根据权利要求1所述的电子体温计的控制方法，其中，所述控制方法包括：
    通过所述无线控制芯片的所述第一控制端分时输出高低电平控制所述参考电阻和所述电容进行充放电操作以获取第一充放电时间；
    通过所述无线控制芯片的所述第二控制端分时输出高低电平控制所述热敏电阻和所述电容进行充放电操作以获取与所述第一充放电时间对应的第二充放电时间；
    对上述两个步骤进行预定次数的重复操作以获取多个所述第一充放电时间 和所述第二充放电时间；
    获取各所述第一充放电时间与对应的所述第二充放电时间的比值，记为第一时间比；
    获取各所述第一时间比的均值，记为第二时间比；
    在样本数据库中对所述第二时间比进行匹配以获取所述热敏电阻周边的温度，其中，所述样本数据库包括样本温度以及与所述样本温度对应的样本时间比。
  5. 根据权利要求4所述的方法，其中，所述在样本数据库中对所述第二时间比进行匹配以获取所述热敏电阻周边的温度的步骤具体为：
    在样本数据库中获取与所述第二时间比相邻的两个样本时间比，记为第一样本时间比和第二样本时间比，其中，所述第一样本时间比小于所述第二样本时间比；
    获取所述第二时间比与所述第一样本时间比的差值，记为第一差值；
    获取所述第二样本时间比与所述第一样本时间比的差值，记为第二差值；
    对所述第一差值与所述第二差值的比值和所述第一样本时间比对应的样本温度求和即可得到所述热敏电阻周边的温度。
  6. 根据权利要求4所述的方法，其中，所述获取各所述第一充放电时间与对应的所述第二充放电时间的比值的步骤之前，所述方法进一步包括步骤：
    获取各所述第一充放电时间与对应的所述第二充放电时间的比值，记为第三时间比；
    获取各所述第三时间比的均值，记为第一均值；
    获取各所述第三时间比与所述第一均值的差值的绝对值，记为第一绝对值；
    删除所述第一绝对值不在第一预定范围内的所述第三时间比对应的所述第一充放电时间和所述第二充放电时间。
  7. 根据权利要求4所述的方法，其中，所述获取各所述第一充放电时间与对应的所述第二充放电时间的比值的步骤之前，所述方法进一步包括步骤：
    获取各所述第一充放电时间的均值，记为第二均值；
    获取各所述第一充放电时间与所述第二均值的差值的绝对值，记为第二绝对值；
    删除所述第二绝对值不在第二预定范围内的所述第一充放电时间以及对应的所述第二充放电时间。
  8. 根据权利要求4所述的方法，其中，所述获取各所述第一充放电时间与对应的所述第二充放电时间的比值的步骤之前，所述方法进一步包括步骤：
    获取各所述第二充放电时间的均值，记为第三均值；
    获取各所述第二充放电时间与所述第三均值的差值的绝对值，记为第三绝对值；
    删除所述第三绝对值不在第三预定范围内的所述第二充放电时间以及对应的所述第一充放电时间。
  9. 根据权利要求4所述的方法，其中，所述通过所述无线控制芯片的所述第一控制端分时输出高低电平控制所述参考电阻和所述电容进行充放电操作以获取第一充放电时间的步骤具体为：
    控制所述无线控制芯片的所述第一控制端输出高电平以通过所述参考电阻对所述电容进行充电并启动计时；
    当所述无线控制芯片检测到所述第三控制端为高电平时，控制所述无线控制芯片的所述第一控制端输出低电平以使所述电容通过所述参考电阻进行放电；
    当所述无线控制芯片检测到所述第三控制端由高电平变为低电平时，停止计时以获得第一充放电时间。
  10. 根据权利要求9所述的方法，其中，所述控制所述无线控制芯片的所述第一控制端输出高电平以通过所述参考电阻对所述电容进行充电并启动计时的步骤之前，所述方法进一步包括：
    配置所述第一控制端为输出模式，所述第二控制端和所述第三控制端为输 入模式；
    控制所述无线控制芯片的所述第一控制端输出低电平并维持第一预定时间。
  11. 根据权利要求4所述的方法，其中，所述控制所述热敏电阻和所述电容进行充放电操作以获取与所述第一充放电时间相对应的第二充放电时间的步骤具体为：
    控制所述无线控制芯片的所述第二控制端输出高电平以通过所述热敏电阻对所述电容进行充电并启动计时；
    当所述无线控制芯片检测到所述第三控制端为高电平时，控制所述无线控制芯片的所述第二控制端输出低电平以使所述电容通过所述热敏电阻进行放电；
    当所述无线控制芯片检测到所述第三控制端由高电平变为低电平时，停止计时以获得第二充放电时间。
  12. 根据权利要求11所述的方法，其中，所述控制所述无线控制芯片的所述第二控制端输出高电平以通过所述热敏电阻对所述电容进行充电并启动计时的步骤之前，所述方法进一步包括：
    配置所述第二控制端为输出模式，所述第一控制端和所述第三控制端为输入模式；
    控制所述无线控制芯片的所述第二控制端输出低电平并维持第二预定时间。
  13. 根据权利要求4所述的方法，其中，在参考恒温槽分时设置多个所述样本温度，使所述热敏电阻处于所述样本温度中，无线控制芯片获取与所述样本温度对应的所述第二时间比，记为样本时间比，其中，多个所述样本温度与对应的所述样本时间比形成所述样本数据库。
  14. 一种根据权利要求1所述的电子体温计的控制方法，其中，所述控制方法包括：
    通过所述无线控制芯片的所述第一控制端分时输出高低电平控制所述参考电阻和所述电容进行充放电操作以获取第一充放电时间；
    通过所述无线控制芯片的所述第二控制端分时输出高低电平控制所述热敏电阻和所述电容进行充放电操作以获取与所述第一充放电时间对应的第二充放电时间；
    对上述两个步骤进行预定次数的重复操作以获取多个所述第一充放电时间和所述第二充放电时间；
    获取各所述第一充放电时间与对应的所述第二充放电时间的比值，记为第三时间比；
    获取各所述第三时间比的均值，记为第一均值；
    获取各所述第三时间比与所述第一均值的差值的绝对值，记为第一绝对值；
    删除所述第一绝对值不在第一预定范围内的所述第三时间比对应的所述第一充放电时间和所述第二充放电时间；
    获取各所述第一充放电时间的均值，记为第二均值；
    获取各所述第一充放电时间与所述第二均值的差值的绝对值，记为第二绝对值；
    删除所述第二绝对值不在第二预定范围内的所述第一充放电时间以及对应的所述第二充放电时间；
    获取各所述第二充放电时间的均值，记为第三均值；
    获取各所述第二充放电时间与所述第三均值的差值的绝对值，记为第三绝对值；
    删除所述第三绝对值不在第三预定范围内的所述第二充放电时间以及对应的所述第一充放电时间；
    获取各所述第一充放电时间与对应的所述第二充放电时间的比值，记为第一时间比；
    获取各所述第一时间比的均值，记为第二时间比；
    在样本数据库中对所述第二时间比进行匹配以获取所述热敏电阻周边的温度，其中，所述样本数据库包括样本温度以及与所述样本温度对应的样本时间比。
  15. 根据权利要求14所述的方法，其中，所述通过所述无线控制芯片的所述第一控制端分时输出高低电平控制所述参考电阻和所述电容进行充放电操作以获取第一充放电时间的步骤具体为：
    控制所述无线控制芯片的所述第一控制端输出高电平以通过所述参考电阻对所述电容进行充电并启动计时；
    当所述无线控制芯片检测到所述第三控制端为高电平时，控制所述无线控制芯片的所述第一控制端输出低电平以使所述电容通过所述参考电阻进行放电；
    当所述无线控制芯片检测到所述第三控制端由高电平变为低电平时，停止计时以获得第一充放电时间。
  16. 根据权利要求15所述的方法，其中，所述控制所述无线控制芯片的所述第一控制端输出高电平以通过所述参考电阻对所述电容进行充电并启动计时的步骤之前，所述方法进一步包括：
    配置所述第一控制端为输出模式，所述第二控制端和所述第三控制端为输入模式；
    控制所述无线控制芯片的所述第一控制端输出低电平并维持第一预定时间。
  17. 根据权利要求14所述的方法，其中，所述控制所述热敏电阻和所述电容进行充放电操作以获取与所述第一充放电时间相对应的第二充放电时间的步骤具体为：
    控制所述无线控制芯片的所述第二控制端输出高电平以通过所述热敏电阻对所述电容进行充电并启动计时；
    当所述无线控制芯片检测到所述第三控制端为高电平时，控制所述无线控 制芯片的所述第二控制端输出低电平以使所述电容通过所述热敏电阻进行放电；
    当所述无线控制芯片检测到所述第三控制端由高电平变为低电平时，停止计时以获得第二充放电时间。
  18. 根据权利要求17所述的方法，其中，所述控制所述无线控制芯片的所述第二控制端输出高电平以通过所述热敏电阻对所述电容进行充电并启动计时的步骤之前，所述方法进一步包括：
    配置所述第二控制端为输出模式，所述第一控制端和所述第三控制端为输入模式；
    控制所述无线控制芯片的所述第二控制端输出低电平并维持第二预定时间。
  19. 根据权利要求14所述的方法，其中，在参考恒温槽分时设置多个所述样本温度，使所述热敏电阻处于所述样本温度中，无线控制芯片获取与所述样本温度对应的所述第二时间比，记为样本时间比，其中，多个所述样本温度与对应的所述样本时间比形成所述样本数据库。
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CN204072062U (zh) * 2014-08-11 2015-01-07 深圳市理邦精密仪器股份有限公司 一种温度传感装置及医疗设备
CN105078416A (zh) * 2015-07-01 2015-11-25 深圳市谷玛鹤健康科技有限公司 一种电子体温计及其控制方法
CN204909403U (zh) * 2015-07-01 2015-12-30 深圳市谷玛鹤健康科技有限公司 一种电子体温计

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