Probe thermometer and method of controlling the same

Abstract

The embodiment of the application provides a probe thermometer and a control method thereof. The probe thermometer comprises a device main body and a probe. The device main body comprises an interface circuit, an analog switch circuit and a main control circuit. The interface circuit is used for detecting whether the probe is inserted into the device main body. One end of the analog switch circuit is connected to a power supply, and the other end is connected to the interface circuit. The interface circuit is grounded. A connection point between the analog switch circuit and the interface circuit serves as a voltage division output node. The analog switch circuit has multiple gears, and different gears have different resistance values. The main control circuit is connected to the interface circuit and the analog switch circuit, and is connected to the voltage division output node. The main control circuit is configured to control the analog switch circuit to switch to the gear with the maximum resistance value if it is detected that the probe is not inserted into the device main body. The probe thermometer provided by the embodiment can switch the analog switch circuit to the gear with the maximum resistance value when it is detected that the probe is not inserted into the device main body, thereby realizing the low-power-consumption effect in the standby state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermometers, in particular to a probe thermometer and a control method thereof. BACKGROUND

[0002] The probe thermometer is also known as a food thermometer, which can be used to measure the temperature inside food to facilitate the user to determine the raw or cooked degree of the food. The probe thermometer is usually equipped with a battery for power supply. However, the existing probe thermometer has high power consumption, which leads to fast consumption of the battery power. As a result, the electric energy is wasted and the user needs to frequently replace the battery, which needs to be further improved. SUMMARY

[0003] The present application aims to provide a probe thermometer and a control method to solve the above problems. The present application achieves the above-mentioned purpose through the following technical solutions.

[0004] In a first aspect, the present application provides a probe thermometer, comprising a device main body and a probe, the probe being detachably inserted into the device main body, the device main body comprising an interface circuit, an analog switch circuit and a main control circuit, the interface circuit being used to detect whether the probe is inserted into the device main body; one end of the analog switch circuit is connected to a power supply, and the other end is connected to the interface circuit, the interface circuit being grounded, a connection point between the analog switch circuit and the interface circuit serving as a voltage division output node, the analog switch circuit having a plurality of gears, wherein different gears have different resistance values; the main control circuit is connected to the interface circuit and the analog switch circuit, and is connected to the voltage division output node, the main control circuit being configured to: if it is detected that the probe is not inserted into the device main body, control the analog switch circuit to switch to the gear with the largest resistance value.

[0005] In a second aspect, the present application provides a control method applied to a probe thermometer, the probe thermometer comprising a device main body and a probe, the probe being detachably inserted into the device main body, the device main body comprising an interface circuit, an analog switch circuit and a main control circuit, one end of the analog switch circuit being connected to a power supply, and the other end being connected to the interface circuit, the interface circuit being grounded, a connection point between the analog switch circuit and the interface circuit serving as a voltage division output node, the analog switch circuit having a plurality of gears, wherein different gears have different resistance values; the main control circuit being connected to the interface circuit and the analog switch circuit, and being connected to the voltage division output node, the control method comprising:

[0006] detecting, by the interface circuit, whether the probe is inserted into the device main body; if it is detected that the probe is not inserted into the device main body, control the analog switch circuit to switch to the gear with the largest resistance value.

[0007] Compared with the prior art, the probe thermometer provided by the embodiment of the application can switch the analog switch circuit to the gear with the maximum resistance value when the probe is not detected to be inserted into the device main body, so as to reduce the current size of the whole machine, and then reduce the overall power consumption of the probe thermometer, and realize the low power consumption effect in the standby state. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0009] Figure 1 A module block diagram of the probe thermometer provided by the embodiment of the application is shown;

[0010] Figure 2 Another module block diagram of the probe thermometer provided by the embodiment of the application is shown;

[0011] Figure 3 A circuit structure schematic diagram of the analog switch circuit in the probe thermometer provided by the embodiment of the application is shown.

[0012] Figure 4 A circuit structure schematic diagram of the main control circuit in the probe thermometer provided by the embodiment of the application is shown.

[0013] Figure 5 A circuit structure schematic diagram of the interface circuit in the probe thermometer provided by the embodiment of the application is shown.

[0014] Figure 6 Another module block diagram of the probe thermometer provided by the embodiment of the application is shown;

[0015] Figure 7 A flowchart of the control method provided by the embodiment of the application is shown. DETAILED DESCRIPTION

[0016] The embodiments of the application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the application, and cannot be understood as a limitation to the application.

[0017] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings of the embodiments of the present application, so that those skilled in the art can better understand the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0018] Please refer to Figure 1 As shown in the figure, the probe thermometer 100 provided by the embodiments of the present application comprises a device main body 110 and a probe 120, the probe 120 is detachably inserted into the device main body 110, the device main body 110 comprises an interface circuit 111, an analog switch circuit 112 and a master control circuit 113, the interface circuit 111 is used to detect whether the probe 120 is inserted into the device main body 110, one end of the analog switch circuit 112 is connected to a power supply, the other end is connected to the interface circuit 111, the interface circuit 111 is grounded, the connection point between the analog switch circuit 112 and the interface circuit 111 is a voltage division output node 114, the analog switch circuit 112 has multiple gears, wherein different gears have different resistance values; the master control circuit 113 is connected to the interface circuit 111 and the analog switch circuit 112, and is connected to the voltage division output node 114; the master control circuit 113 is configured to:

[0019] If it is not detected that the probe 120 is inserted into the device main body 110, the analog switch circuit 112 is controlled to switch to the gear with the largest resistance value.

[0020] In the probe thermometer 100 provided by the embodiments of the present application, the master control circuit 113 is connected to the interface circuit 111, used to acquire the detection signal about whether the probe 120 is inserted into the device main body 110 sent by the interface circuit 111; the master control circuit 113 is connected to the analog switch circuit 112, used to control the analog switch circuit 112 to switch gears, and can be used to provide power supply for the analog switch circuit 112, the master control circuit 113 is also connected to the voltage division output node 114, used to read the voltage at the voltage division output node 114.

[0021] The probe 120 can be an NTC thermistor type temperature probe, as the temperature changes, the resistance value of the probe 120 changes, that is, the resistance value of the interface circuit 111 changes, at this time the voltage at the voltage division output node 114 changes, the master control circuit 113 can acquire the temperature information detected by the probe 120 according to the voltage. At the same time, when it is not detected that the probe 120 is inserted into the device main body 110, the master control circuit 113 controls the analog switch circuit 112 to switch to the gear with the largest resistance value, which can reduce the current flowing through the analog switch circuit 112 and the master control circuit 113, and further can reduce the overall power consumption of the probe thermometer 100, realizing the low power consumption effect in standby state.

[0022] Please refer to Figure 1 and Figure 2 As shown in the figure, in the embodiment, the device body 110 can further include a Bluetooth chip 130, such as Bluetooth chip FR8018HA or Bluetooth chip FR8016HB, etc. The Bluetooth chip 130 can be integrated with the interface circuit 111, the analog switch circuit 112 and the master control circuit 113.

[0023] Of course, in other embodiments, the Bluetooth chip 130 can be replaced by other MCU (Microcontroller Unit) chips, which can also be integrated with the interface circuit 111, the analog switch circuit 112 and the master control circuit 113.

[0024] The device body 110 can further include a display screen 141, a battery 142, a buzzer 143 and a key 144, etc. The display screen 141, the battery 142, the buzzer 143 and the key 144 are all connected to the Bluetooth chip 130. The display screen 141 is used to display the temperature value detected by the probe 120 in real time. The battery 142 is used to provide power. The buzzer 143 is used to issue an alarm when the temperature value detected by the probe 120 exceeds the preset temperature value. The key 144 can include a first key, a second key, a third key and a fourth key. The first key is used to manually switch the gear of the analog switch circuit 112. The second key is used to increase the preset temperature value. The third key is used to decrease the preset temperature value. The fourth key is used as the power on and off key of the probe thermometer 100.

[0025] The number of probes 120 can include multiple probes, such as a first probe 121, a second probe 122, a third probe 123 and a fourth probe 124. The first probe 121, the second probe 122, the third probe 123 and the fourth probe 124 are all detachably inserted into the device body 110.

[0026] Please refer to Figure 1 and Figure 3 As shown in the figure, in some embodiments, the analog switch circuit 112 can include a first resistor R1, a second resistor R2 and a third resistor R3. The first resistor R1, the second resistor R2 and the third resistor R3 can be selectively connected to the interface circuit 111 to switch the gear of the analog switch circuit 112. The resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 increase in turn. The master control circuit 113 is configured to:

[0027] If it is not detected that the probe 120 is inserted into the device body 110, the third resistor R3 is connected in series with the interface circuit 111, and the first resistor R1 and the interface circuit 111, and the second resistor R2 and the interface circuit 111 are disconnected.

[0028] As an example, the first resistor R1 has a resistance of 330 ohms and a precision of 1%; the second resistor R2 has a resistance of 5.1K ohms and a precision of 1%; and the third resistor R3 has a resistance of 100K ohms and a precision of 1%. The higher the precision of the resistor, the better the consistency of the resistor. In other embodiments, the third resistor R3 can also have a resistance of 150K ohms or a high resistance state.

[0029] The analog switch circuit 112 can selectively switch between the first gear, the second gear and the third gear. When the first resistor R1 is connected to the interface circuit 111, the analog switch circuit 112 is in the first gear; when the second resistor R2 is connected to the interface circuit 111, the analog switch circuit 112 is in the second gear; and when the third resistor R3 is connected to the interface circuit 111, the analog switch circuit 112 is in the third gear.

[0030] When it is detected that the probe 120 is not inserted into the device main body 110, the main control circuit 113 controls the analog switch circuit 112 to switch to the third gear, at which time the third resistor R3 with the largest resistance is connected in series between the power supply and the ground, which can effectively reduce the current size, so that the probe thermometer 100 enters a low-power consumption state.

[0031] In other embodiments, the analog switch circuit 112 can also divide the voltage by using a capacitor or by using an inductor, which will not be described one by one here.

[0032] Please refer to Figure 3 and Figure 4 In some embodiments, the analog switch circuit 112 can further include a first analog switch U1 and a second analog switch U2. The signal input end IN of the first analog switch U1 is connected to CH3_ADC_EN2 of the main control circuit 113, which can be a port in the Bluetooth chip for controlling the first analog switch U1. The power supply end V+ of the first analog switch U1 is connected to RL3V0 of the main control circuit 113, which can be a power supply port of the Bluetooth chip. The common terminal COM of the first analog switch U1 is connected to the normally closed end NC of the second analog switch U2. The normally open end NO of the first analog switch U1 is connected to the second end of the third resistor R3. The first end of the third resistor R3 is connected to the voltage division output node CH3_ADC1. The normally closed end NC of the first analog switch U1 is connected to the second end of the second resistor R2. The first end of the second resistor R2 is connected to the voltage division output node CH3_ADC1. The ground end of the first analog switch U1 is grounded.

[0033] The signal input end IN of the second analog switch U2 is connected with CH3_ADC_EN1 of the main control circuit 113, and CH3_ADC_EN1 can be a port in the main control circuit 113 for controlling the second analog switch U2. The power supply end V+ of the second analog switch U2 is connected with RL3V0 of the main control circuit 113. The common terminal COM of the second analog switch U2 is connected with RL3V0 of the main control circuit 113. The normally open end NO of the second analog switch U2 is connected with the second end of the first resistor R1. The first end of the first resistor R1 is connected with the voltage division output node CH3_ADC1. The main control circuit 113 is configured to:

[0034] The first resistor R1, the second resistor R2 or the third resistor R3 is selected to be connected with the interface circuit 111 through the first analog switch U1 and the second analog switch U2, so as to complete the gear switching function of the analog switch circuit 112.

[0035] Specifically, the main control circuit 113 switches the gear of the analog switch circuit 112 through the configuration of CH3_ADC_EN1 and CH3_ADC_EN2. For example, when it is detected that the probe 120 is not inserted into the device main body 110, CH3_ADC_EN1 is pulled down to a logic low level, at this time, the common terminal COM of the second analog switch U2 is connected to the normally closed end NC. At the same time, CH3_ADC_EN2 is pulled up to a logic high level, at this time, the common terminal COM of the first analog switch U1 is connected to the normally open end NO, and the power supply current can flow to the voltage division output node CH3_ADC1 through RL3V0 connected with the second analog switch U2, the fourth pin of the second analog switch U2, the third pin of the second analog switch U2, the fourth pin of the first analog switch U1, the first pin of the first analog switch U1 and the third resistor R3, that is, the third resistor R3 and the interface circuit 111 are connected in series between the power supply and the ground terminal.

[0036] In the embodiment, the first analog switch U1 and the second analog switch U2 can be SGM3157 type analog signal switch chips. The chips adopt a rail-to-rail working mode, have short switching time and high speed, and meet the application occasions requiring high-speed switching.

[0037] In other embodiments, the analog switch circuit 112 can also be composed of JFET (junction field effect transistor) or MOS tube (insulated gate field effect transistor), as long as the gear switching function of the analog switch circuit 112 can be realized.

[0038] Please refer to Figure 4 and Figure 5As shown, the interface circuit 111 can include an earphone socket PJ-342 for plugging the probe 120, a pin 3 of the earphone socket PJ-342 is connected to CH3_PJ_EN1 of the master control circuit 113 through a resistor R57, CH3_PJ_EN1 can be a port in a Bluetooth chip for detecting whether the probe 120 is inserted, a pin 4 and a pin 6 of the earphone socket PJ-342 are connected to CH3_ADC1 detection pins of the master control circuit 113, and the pin 4 and the pin 6 of the earphone socket PJ-342 are grounded through a diode ED7 to achieve an anti-static effect.

[0039] When the probe 120 is not inserted into the earphone socket PJ-342, the pins 8 and 9 of the earphone socket PJ-342 are disconnected, at this time CH3_PJ_EN1 of the master control circuit 113 is pulled high; when the probe 120 is inserted into the earphone socket PJ-342, the pins 8 and 9 of the earphone socket PJ-342 are connected, at this time CH3_PJ_EN1 is grounded, thus CH3_PJ_EN1 of the master control circuit 113 is pulled low from high, thereby triggering an interrupt, and the master control circuit 113 judges that the probe 120 is inserted according to the interrupt.

[0040] Please refer to Figure 1 , Figure 3 and Figure 5 together, the voltage detection end CH3_PROBE_ADC1 of the master control circuit 113 is connected to the voltage division output node CH3_ADC1, and the master control circuit 113 is further configured to:

[0041] If it is detected that the probe 120 is plugged into the device main body 110, that is, it is detected that the probe 120 is plugged into the earphone socket PJ-342, it is judged whether the voltage obtained by the voltage detection end CH3_PROBE_ADC1 exceeds the range;

[0042] If yes, the analog switch circuit 112 is controlled to switch between multiple gears until the voltage obtained by the voltage detection end CH3_PROBE_ADC1 meets the range, and temperature data is obtained according to the voltage.

[0043] In this embodiment, the range of the voltage is 0V-3.0V, and when the voltage obtained by the voltage detection end CH3_PROBE_ADC1 is greater than or equal to 3.0V, it is judged that the voltage exceeds the range.

[0044] As an example, when it is detected that the probe 120 is plugged into the earphone jack PJ-342, the analog switch circuit 112 is switched to the first gear to read the voltage value of CH3 PROBE ADC1, if the voltage value of CH3 PROBE ADC1 exceeds the range, it is switched to the second gear to read the voltage value of CH3 PROBE ADC1, if the voltage value of CH3 PROBE ADC1 still exceeds the range at this time, it is switched to the third gear, until the voltage value of CH3 PROBE ADC1 does not exceed the range, at this time the software of the host circuit 113 can obtain accurate temperature data by analog-to-digital conversion of the voltage, and then the temperature data can be stored in the memory.

[0045] In some embodiments, the voltage detection end CH3 PROBE ADC1 can adopt a timing mechanism to collect voltage in time periods, for example, the collection time interval is 1 second, that is, the voltage is collected once every 1 second, and the power supply of the interface circuit 111 and the analog switch circuit 112 is cut off in the idle time period to achieve lower power consumption.

[0046] The specific circuit layout of the first gear, the second gear and the third gear is described in detail below:

[0047] When the CH3 ADC EN1 of the second analog switch U2 is pulled up to a logic high level, the common terminal COM of the second analog switch U2 is hit to the normally open end NO, at this time the 4th pin and the 3rd pin of the second analog switch U2 are disconnected, the first analog switch U1 is in an open circuit state, the power supply current flows to the voltage division output node CH3 ADC1 through the RL3V0 of the second analog switch U2, the 4th pin of the second analog switch U2, the 1st pin of the second analog switch U2, and the first resistor R1, at this time the first resistor R1 plays a voltage division role, and the analog switch circuit 112 is in the first gear.

[0048] When the CH3 ADC EN1 of the second analog switch U2 is pulled down to a logic low level, at this time the common terminal COM of the second analog switch U2 is hit to the normally closed end NC; the CH3 ADC EN2 of the first analog switch U1 is pulled down to a logic low level, at this time the common terminal COM of the first analog switch U1 is hit to the normally closed end NC, the power supply current flows to the voltage division output node CH3 ADC1 through the RL3V0 of the second analog switch U2, the 4th pin of the second analog switch U2, the 3rd pin of the second analog switch U2, the 4th pin of the first analog switch U1, the 3rd pin of the first analog switch U1, and the second resistor R2, at this time the second resistor R2 plays a voltage division role, and the analog switch circuit 112 is in the second gear.

[0049] When the CH3_ADC_EN1 of the second analog switch U2 is pulled down to logic low level, the common terminal COM of the second analog switch U2 opens the normally closed terminal NC at this time; the CH3_ADC_EN2 of the first analog switch U1 is pulled up to logic high level, the common terminal COM of the first analog switch U1 hits the normally open terminal NO at this time, the power supply current flows to the voltage division output node CH3_ADC1 through the RL3V0 of the second analog switch U2, the 4th pin of the second analog switch U2, the 3rd pin of the second analog switch U2, the 4th pin of the first analog switch U1, the 1st pin of the first analog switch U1, the third resistor R3, at this time the third resistor R3 plays a role of voltage division, the analog switch circuit 112 is in the third gear.

[0050] In some embodiments, the main control circuit 113 is configured to:

[0051] record the gear information corresponding to the gear meeting the range;

[0052] If the voltage detection end CH3_PROBE_ADC1 obtains the voltage of the next period, the analog switch circuit 112 is switched to the gear corresponding to the gear information.

[0053] In this embodiment, the main control circuit 113 records the gear information corresponding to the gear meeting the range through the software of the main control circuit 113, and the software of the main control circuit 113 can only record the gear information used in the last period, so as to save storage space. For example, the voltage of the last period is the voltage meeting the range after the analog switch circuit 112 is switched to the second gear, and the second gear is recorded as the gear information. When the voltage detection end CH3_PROBE_ADC1 obtains the voltage of the next period, the analog switch circuit 112 is directly switched to the second gear, and then it is judged whether the voltage value of CH3_PROBE_ADC1 meets the range. In this way, the number of times of switching gears of the analog switch circuit 112 can be reduced to a certain extent, so as to reduce the time of collecting the voltage input by the probe 120, that is, to reduce the temperature detection time, and finally to reduce the power consumption of the whole machine.

[0054] In this embodiment, if the time interval between the current voltage obtained by CH3_PROBE_ADC1 and the last voltage exceeds the set time value, the current voltage is judged as the voltage of the next period. In other embodiments, the main control circuit 113 records the voltage obtained by the voltage detection end CH3_PROBE_ADC1 as a reference signal when the probe 120 is at room temperature, and if the voltage difference between the current voltage obtained by CH3_PROBE_ADC1 and the reference voltage exceeds the set voltage value, the current voltage is judged as the voltage of the next period.

[0055] In some other embodiments, the host circuit 113 can sort the positions of the analog switch circuit 112, and then switch the positions of the analog switch circuit 112 through a binary search algorithm until the voltage acquired by the voltage detection terminal CH3 PROBE ADC1 meets the range.

[0056] As an example, the analog switch circuit 112 has positions 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 with resistances increasing in order. The analog switch circuit 112 is first switched to the middle position 5 to read the voltage value of CH3 PROBE ADC1. If the voltage value of CH3 PROBE ADC1 exceeds the range, the analog switch circuit 112 is switched to the middle position of the second half, i.e., position 8, to read the voltage value of CH3 PROBE ADC1. If the voltage value of CH3 PROBE ADC1 still exceeds the range at this time, the analog switch circuit 112 is switched to positions 9 and 10 in order until the voltage value of CH3 PROBE ADC1 does not exceed the range. In this way, the number of times of switching the positions of the analog switch circuit 112 can be reduced to a certain extent.

[0057] In some other embodiments, the host circuit 113 can also switch the positions of the analog switch circuit 112 in a round-robin manner. Specifically, the host circuit 113 first sorts the positions of the analog switch circuit 112, and then switches the positions of the analog switch circuit 112 in order according to the sorting until the voltage value of CH3 PROBE ADC1 meets the range.

[0058] In some embodiments, the host circuit 113 is further configured to:

[0059] If the host circuit 113 acquires the temperature data, the host circuit 113 controls the analog switch circuit 112 to switch to the position with the largest resistance value.

[0060] Taking the third position as an example, the software of the host circuit 113 controls the analog switch circuit 112 to switch to the third position with the largest resistance value after acquiring the temperature data according to the voltage meeting the range. At this time, the third resistor R3 with the largest resistance value plays a role in voltage division, and the current of the probe thermometer 100 can be reduced to a minimum, thereby reducing the power consumption of the whole machine in standby.

[0061] Please refer to Figure 1 and Figure 6 In some embodiments, the device body 110 further includes a Bluetooth module 115 connected to the host circuit 113. The Bluetooth module 115 can be integrated into a Bluetooth chip 130 (see Figure 2 for details). The host circuit 113 is configured to:

[0062] After the device main body 110 is powered on, the broadcast period of the Bluetooth module 115 is configured;

[0063] The Bluetooth module 115 is controlled to transmit the temperature data according to the broadcast period; and

[0064] After the temperature data is transmitted, the Bluetooth module 115 is controlled to enter the sleep state.

[0065] The broadcast period of the Bluetooth module 115 includes a broadcast time interval and a broadcast duration of each broadcast. The broadcast time interval can be 1 second or 1.2 seconds, etc. The broadcast duration can be 1 second or 2 seconds, etc. After the broadcast duration ends, the Bluetooth module 115 automatically enters the sleep state. The Bluetooth module 115 intermittently transmits the temperature data to a mobile phone or other Bluetooth receiving device according to the broadcast period, so that the temperature value of the probe thermometer 100 can be viewed on the Bluetooth receiving device.

[0066] In this embodiment, the Bluetooth module 115 is only used to receive control instructions transmitted by a mobile phone or other Bluetooth receiving device after entering the sleep state, and transmit the control instructions to the main control circuit 113. The Bluetooth module 115 does not transmit data to the outside in the sleep state, so as to reduce power consumption. Alternatively, in some other embodiments, the power supply of the Bluetooth module 115 is cut off after the Bluetooth module 115 enters the sleep state, so as to achieve lower power consumption.

[0067] Further, after the temperature data is transmitted, the Bluetooth module 115 is immediately controlled to enter the sleep state even if the broadcast duration has not ended, so as to further reduce power consumption. For example, the Bluetooth broadcast duration is 2 seconds. If the temperature data is transmitted at 1 second, the Bluetooth broadcast duration is still 1 second, and the Bluetooth module 115 is still controlled to enter the sleep state, instead of waiting for the remaining 1 second to end and then controlling the Bluetooth to enter the sleep state.

[0068] In some embodiments, the number of probes 120 includes a plurality of probes. The number of voltage detection ends of the main control circuit 113 is consistent with the number of probes 120. The number of interface circuits 111 and analog switch circuits 112 is consistent with the number of probes 120. Each probe 120 is connected to a corresponding voltage detection end through a corresponding interface circuit 111 and analog switch circuit 112.

[0069] Please refer to Figure 2 , Figure 4 and Figure 6As shown, the exemplary probe 120 can include a first probe 121, a second probe 122, a third probe 123, and a fourth probe 124, and the master control circuit 113 is configured with voltage detection terminals CH1_PROBE_ADC1, CH2_PROBE_ADC1, CH3_PROBE_ADC1, and CH4_PROBE_ADC1 to respectively acquire the voltage input by the first probe 121, the second probe 122, the third probe 123, and the fourth probe 124.

[0070] In this embodiment, the master control circuit 113 is configured to:

[0071] acquire a plurality of temperature data according to the voltage input by the plurality of voltage detection terminals;

[0072] compress the plurality of temperature data and then send the compressed temperature data through the Bluetooth module 115.

[0073] The voltage input by the plurality of voltage detection terminals can be the voltage acquired by each voltage detection terminal at the same time, for example, the user simultaneously uses the first probe 121 and the second probe 122 to measure the temperature, and the CH1_PROBE_ADC1 and the CH2_PROBE_ADC1 of the master control circuit 113 simultaneously acquire a voltage. According to the voltage input by the CH1_PROBE_ADC1 and the CH2_PROBE_ADC1, the temperature data of the first probe 121 and the temperature data of the second probe 122 can be acquired respectively, and then the temperature data of the first probe 121 and the temperature data of the second probe 122 are compressed and sent through the Bluetooth module 115, which can reduce the data sending time.

[0074] The voltage input by the plurality of voltage detection terminals can also be the voltage acquired by each voltage detection terminal within a preset time period, for example, the preset time period is 10s, the user first uses the first probe 121 to measure the temperature, then uses the second probe 122 to measure the temperature after 2s, and then uses the third probe 123 to measure the temperature after 3s, and the time interval of the voltage acquired by the CH1_PROBE_ADC1, the CH2_PROBE_ADC1, and the CH3_PROBE_ADC1 is within 10s, then the temperature data of the first probe 121, the temperature data of the second probe 122, and the temperature data of the third probe 123 will be sent through the Bluetooth module 115 after compression.

[0075] If the user first uses the first probe 121 to measure the temperature, then uses the second probe 122 to measure the temperature after an interval of 5s, and then uses the third probe 123 to measure the temperature after an interval of 12s, the time interval for CH1_PROBE_ADC1 and CH2_PROBE_ADC1 to obtain the voltage is within 10s, while the time interval for CH1_PROBE_ADC1 and CH3_PROBE_ADC1 to obtain the voltage exceeds 10s, so the temperature data of the first probe 121 and the temperature data of the second probe 122 will be sent together after compression, and the temperature data of the third probe 123 can be sent separately.

[0076] The probe thermometer 100 provided in the embodiment can reduce the current flowing through the analog switch circuit 112 and the main control circuit 113 when the probe 120 is not detected to be inserted into the device main body 110, thereby reducing the overall power consumption of the probe thermometer 100, and realizing the low-power-consumption effect in the standby state.

[0077] Please refer to FIGS. 1 to 3, and FIGS. 4 to 6 as well. Figure 1 Figure 7 The control method provided in the embodiment can be applied to the probe thermometer 100, the probe thermometer 100 includes a device main body 110 and a probe 120, the probe 120 is detachably inserted into the device main body 110, the device main body 110 includes an interface circuit 111, an analog switch circuit 112, and a main control circuit 113, one end of the analog switch circuit 112 is connected to a power supply, the other end is connected to the interface circuit 111, the interface circuit 111 is grounded, a connection point between the analog switch circuit 112 and the interface circuit 111 is a voltage division output node 114, the analog switch circuit 112 has multiple gears, different gears have different resistance values; the main control circuit 113 is connected to the interface circuit 111 and the analog switch circuit 112, and is connected to the voltage division output node 114.

[0078] The control method can include steps S210 and S220.

[0079] Step S210: detecting whether the probe 120 is inserted into the device main body 110 through the interface circuit 111.

[0080] Step S220: if the probe 120 is not detected to be inserted into the device main body 110, controlling the analog switch circuit 112 to switch to the gear with the largest resistance value.

[0081] In some embodiments, the voltage detection end of the main control circuit 113 is connected to the voltage division output node 114, and the control method further includes the following steps.

[0082] ​If the probe 120 is detected to be inserted into the device body 110, it is determined whether the voltage obtained by the voltage detection end exceeds the range;

[0083] If yes, the analog switch circuit 112 is controlled to switch between multiple gears until the voltage obtained by the voltage detection end meets the range, and temperature data is obtained according to the voltage.

[0084] In some embodiments, the control method can further include the following steps:

[0085] Recording the gear information corresponding to the gear meeting the range;

[0086] If the voltage detection end obtains the voltage of the next period, the analog switch circuit 112 is controlled to switch to the gear corresponding to the gear information.

[0087] In some embodiments, the control method can further include the following steps:

[0088] If the host circuit 113 obtains the temperature data, the analog switch circuit 112 is controlled to switch to the gear with the largest resistance value.

[0089] In some embodiments, the device body 110 further includes a Bluetooth module 115 connected to the host circuit 113; the control method can further include the following steps:

[0090] After the device body 110 is powered on, the broadcast period of the Bluetooth module 115 is configured;

[0091] The Bluetooth module 115 is controlled to send the temperature data according to the broadcast period; and

[0092] After the temperature data is sent, the Bluetooth module 115 is controlled to enter a sleep state.

[0093] In some embodiments, the number of probes 120 includes multiple, and the number of voltage detection ends is consistent with the number of probes 120; the control method can further ensure the following steps:

[0094] Multiple temperature data are obtained according to the voltage input by each voltage detection end;

[0095] The multiple temperature data are compressed and then sent through the Bluetooth module 115.

[0096] The embodiments of the present application provide a control method applied to a probe thermometer 100, which can control the analog switch circuit 112 to switch to the gear with the largest resistance value when the probe thermometer 100 does not detect that the probe 120 is inserted into the device body 110, so as to reduce the current size of the whole machine, and further reduce the overall power consumption of the probe thermometer 100, and realize the low-power-consumption effect in the standby state.

[0097] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A probe thermometer characterized by comprising: The device comprises a device body and a probe, the probe is detachably inserted into the device body, the device body comprises: an interface circuit for detecting whether the probe is inserted into the device body; an analog switch circuit, one end of the analog switch circuit is connected to a power supply, the other end is connected to the interface circuit, the interface circuit is grounded, and a connection point between the analog switch circuit and the interface circuit serves as a voltage division output node, the analog switch circuit has multiple gears, wherein different gears have different resistance values; and a master control circuit connected to the interface circuit and the analog switch circuit, and connected to the voltage division output node, the master control circuit is configured to: if it is detected that the probe is not inserted into the device body, control the analog switch circuit to switch to a gear with the largest resistance value.

2. The probe thermometer according to claim 1, characterized by a voltage detection end of the master control circuit is connected to the voltage division output node, the master control circuit is configured to: if it is detected that the probe is inserted into the device body, determine whether the voltage obtained by the voltage detection end exceeds a range; if yes, control the analog switch circuit to switch between multiple gears until the voltage meets the range, and obtain temperature data according to the voltage.

3. The probe thermometer according to claim 2, characterized by the master control circuit is configured to: record gear information corresponding to the gear meeting the range; if the voltage detection end obtains the voltage of the next period, control the analog switch circuit to switch to a gear corresponding to the gear information.

4. The probe thermometer according to claim 2, wherein the master control circuit is configured to: if the master control circuit obtains the temperature data, control the analog switch circuit to switch to a gear with the largest resistance value.

5. The probe thermometer according to claim 2, wherein The device body further comprises a Bluetooth module connected to the master control circuit, the master control circuit is configured to: after the device body is powered on, configure a broadcast period of the Bluetooth module; control the Bluetooth module to send the temperature data according to the broadcast period; and after the temperature data is sent, control the Bluetooth module to enter a sleep state.

6. The probe thermometer according to claim 5, wherein The number of probes includes multiple, the number of voltage detection ends is consistent with the number of probes; the master control circuit is configured to: obtain multiple temperature data according to the voltage input by each voltage detection end; compress multiple temperature data and then send them through the Bluetooth module.

7. The probe thermometer according to claim 1, wherein The analog switch circuit comprises a first resistor, a second resistor and a third resistor, the first resistor, the second resistor and the third resistor are selectively connected to the interface circuit to switch the gears of the analog switch circuit, the resistance values of the first resistor, the second resistor and the third resistor increase in turn; the master control circuit is configured to: if it is detected that the probe is not inserted into the device body, control the third resistor to be connected in series with the interface circuit, and disconnect the first resistor and the interface circuit, and the second resistor and the interface circuit.

8. The probe thermometer according to claim 7, characterized by The analog switch circuit further comprises a first analog switch and a second analog switch, a signal input end and a power supply end of the first analog switch are connected to the master control circuit, a common terminal of the first analog switch is connected to a normally closed end of the second analog switch, a normally open end of the first analog switch is connected to a second end of the third resistor, and a first end of the third resistor is connected to the voltage division output node; a normally closed end of the first analog switch is connected to a second end of the second resistor, and a first end of the second resistor is connected to the voltage division output node; a signal input end, a power supply end and a common terminal of the second analog switch are connected to the master control circuit, a normally open end of the second analog switch is connected to a second end of the first resistor, and a first end of the first resistor is connected to the voltage division output node; the master control circuit is configured to: select the first resistor, the second resistor or the third resistor to be connected to the interface circuit through the first analog switch and the second analog switch.

9. A control method applied to a probe thermometer, the probe thermometer comprising a device main body and a probe, the probe being detachably inserted into the device main body, the device main body comprising an interface circuit, an analog switch circuit and a main control circuit, one end of the analog switch circuit being connected to a power supply, the other end being connected to the interface circuit, the interface circuit being grounded, a connection point between the analog switch circuit and the interface circuit serving as a voltage division output node, the analog switch circuit having multiple gears, wherein, Different gears have different resistance values; The master control circuit is connected to the interface circuit and the analog switch circuit, and is connected to the voltage division output node, and the control method comprises: detecting, through the interface circuit, whether the probe is inserted into the device body; If it is detected that the probe is not inserted into the device body, the analog switch circuit is controlled to switch to the gear with the maximum resistance value.

10. The control method according to claim 9, characterized by, The voltage detection end of the master control circuit is connected to the voltage division output node, and the control method further comprises: If it is detected that the probe is inserted into the device body, it is judged whether the voltage obtained by the voltage detection end exceeds the range; If yes, the analog switch circuit is controlled to switch between a plurality of gears until the voltage meets the range, and temperature data is obtained according to the voltage.

Images