CN115655503A - Probe thermometer and its control method - Google Patents

Abstract

The embodiment of the application provides a probe thermometer and a control method thereof, wherein the probe thermometer comprises an equipment main body and a probe, the equipment main body comprises an interface circuit, an analog switch circuit and a main control circuit, and the interface circuit is used for detecting whether the probe is inserted into the equipment main body or not; one end of the analog switch circuit is connected with the power supply, the other end of the analog switch circuit is connected with the interface circuit, the interface circuit is grounded, a connection point between the analog switch circuit and the interface circuit is used as a voltage division output node, the analog switch circuit is provided with a plurality of gears, and different gears have different resistance values; the master control circuit is connected with the interface circuit and the analog switch circuit and is connected with the voltage division output node, and the master control circuit is configured to: and if the probe is not detected to be inserted in the equipment main body, controlling the analog switch circuit to be switched to a gear with the maximum resistance value. The probe thermometer provided by the embodiment can switch the analog switch circuit to the gear with the largest resistance value when the probe is not detected to be inserted in the device body, so that the low power consumption effect in the standby state is realized.

Description

Probe thermometer and its control method

technical field

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

Background technique

Probe thermometers, also known as food thermometers, can be used to measure the temperature inside food, so that users can judge the degree of raw or cooked food. Probe thermometers are usually equipped with batteries for power supply. However, the high power consumption of existing probe thermometers leads to rapid battery power consumption, which not only wastes power, but also requires users to frequently replace batteries, which needs further improvement.

Contents of the invention

The purpose of this application is to propose a probe thermometer and a control method to solve the above problems. The present application achieves the above object through the following technical solutions.

In the first aspect, the embodiment of the present application provides a probe thermometer, which includes a device body and a probe. The probe is detachably inserted into the device body. The device body includes an interface circuit, an analog switch circuit and a main control circuit. The interface circuit It is used to detect whether the probe is inserted into the main body of the device; one end of the analog switch circuit is connected to the power supply, the other end is connected to the interface circuit, the interface circuit is grounded, and the connection point between the analog switch circuit and the interface circuit is used as a voltage divider output node, the analog switch The 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 divider output node. The main control circuit is configured as follows: if no probe is detected It is inserted into the main body of the device to control the analog switch circuit to switch to the gear with the largest resistance value.

In the second aspect, the embodiment of the present application provides a control method, which is applied to a probe thermometer. The probe thermometer includes a device body and a probe. The probe is detachably inserted into the device body. The device body includes an interface circuit and an analog switch. circuit and the main control circuit, one end of the analog switch circuit is connected to the power supply, the other end is connected to the interface circuit, the interface circuit is grounded, the connection point between the analog switch circuit and the interface circuit is used as a voltage division output node, and the analog switch circuit has multiple gears , where different gears have different resistance values; the main control circuit is connected to the interface circuit and the analog switch circuit, and connected to the voltage divider output node, and the control method includes:

Whether the probe is inserted into the main body of the device is detected through the interface circuit; if it is not detected that the probe is inserted into the main body of the device, the analog switch circuit is controlled to switch to the gear with the largest resistance value.

Compared with the prior art, the probe thermometer provided by the embodiment of the present application can switch the analog switch circuit to the gear with the largest resistance value when the probe is not detected to be inserted into the main body of the device, which can reduce the current of the whole machine , which in turn can reduce the overall power consumption of the probe thermometer, and realize the low power consumption effect in the standby state.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 shows the module block diagram of the probe thermometer that the embodiment of the application provides;

Fig. 2 shows another kind of block diagram of the probe thermometer provided by the embodiment of the present application;

Fig. 3 shows a schematic diagram of the circuit structure of the analog switch circuit in the probe thermometer provided by the embodiment of the present application.

Fig. 4 shows a schematic diagram of the circuit structure of the main control circuit in the probe thermometer provided by the embodiment of the present application.

Fig. 5 shows a schematic diagram of the circuit structure of the interface circuit in the probe thermometer provided by the embodiment of the present application.

Fig. 6 shows another kind of block diagram of the probe thermometer provided by the embodiment of the present application;

Fig. 7 shows a schematic flowchart of a control method provided by an embodiment of the present application.

Detailed ways

Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, are only for explaining the present application, and should not be construed as limiting the present application.

In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

Please refer to Fig. 1, the probe thermometer 100 provided by the embodiment of the present application includes a device body 110 and a probe 120, the probe 120 is detachably inserted in the device body 110, the device body 110 includes an interface circuit 111, an analog switch circuit 112 and the main control circuit 113, the interface circuit 111 is used to detect whether the probe 120 is inserted in the device main body 110, one end of the analog switch circuit 112 is connected to the power supply, the other end is connected to the interface circuit 111, the interface circuit 111 is grounded, and the analog switch circuit 112 The connection point with the interface circuit 111 is used as a voltage-dividing output node 114, and the analog switch circuit 112 has multiple gear positions, wherein different gear positions have different resistance values; the main control circuit 113 connects the interface circuit 111 and the analog switch circuit 112, and connect the voltage division output node 114; the main control circuit 113 is configured as:

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

In the probe thermometer 100 provided in the embodiment of the present application, the main control circuit 113 is connected to the interface circuit 111 for obtaining the detection signal about whether the probe 120 is inserted into the device main body 110 sent by the interface circuit 111; the main control circuit 113 is connected to the analog The switch circuit 112 is used to control the analog switch circuit 112 to switch gears, and can be used to provide power for the analog switch circuit 112. The main control circuit 113 is also connected to the voltage division output node 114 for reading the voltage at the voltage division output node 114 .

The probe 120 may be an NTC thermistor 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 divider output node 114 is That is, a change occurs, and the main control circuit 113 can obtain temperature information detected by the probe 120 according to the voltage. At the same time, when the probe 120 is not detected to be inserted into the device main body 110, the main 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 main control circuit 113 size, thereby reducing the overall power consumption of the probe thermometer 100 and realizing the low power consumption effect in the standby state.

Please refer to FIG. 1 and FIG. 2 together. In this embodiment, the device body 110 may also include a Bluetooth chip 130, such as a Bluetooth chip FR8018HA or a Bluetooth chip FR8016HB, etc., and the Bluetooth chip 130 may be integrated with an interface circuit 111, an analog switch, etc. Circuit 112 and main control circuit 113.

Of course, in some other embodiments, the Bluetooth chip 130 can also be replaced with other MCU (Microcontroller Unit, micro control unit) chips, and the MCU chip can also be integrated with the interface circuit 111, the analog switch circuit 112 and the main control circuit 113 .

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

The number of probes 120 can include multiple, for example, the probes 120 can include 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 detachably inserted into the device main body 110 .

Please refer to FIG. 1 and FIG. 3 together. In some embodiments, the analog switch circuit 112 may include a first resistor R1, a second resistor R2 and a third resistor R3, and the first resistor R1, the second resistor R2 and the third resistor The three resistors R3 can be selectively connected to the interface circuit 111 to switch the gear position of the analog switch circuit 112, and the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 are sequentially increased; the main control circuit 113 is configured as:

If it is not detected that the probe 120 is inserted into the device main body 110 , control the third resistor R3 to be connected in series with the interface circuit 111 , and disconnect the first resistor R1 from the interface circuit 111 and the second resistor R2 from the interface circuit 111 .

As an example, the resistance value of the first resistor R1 is 330 ohms and the precision is 1%; the resistance value of the second resistor R2 is 5.1K ohms and the precision is 1%; the resistance value of the third resistor R3 is 100K ohms and the precision is 1%. 1%. The higher the precision of the resistance, the better the consistency of the resistance. In some other implementation manners, the resistance value of the third resistor R3 may also be 150K ohms or be in a high resistance state.

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

When it is not detected that the probe 120 is inserted into the main body 110 of the device, the main control circuit 113 controls the analog switch circuit 112 to switch to the third gear. At this time, the third resistor R3 with the largest resistance is connected in series with the interface circuit 111 at the power supply and ground terminals. Between, the magnitude of the current can be effectively reduced, so that the probe thermometer 100 enters a low power consumption state.

In some other embodiments, the analog switch circuit 112 may also perform voltage division through a capacitor, or perform voltage division through an inductor, which will not be described in detail here.

Please refer to FIG. 3 and FIG. 4 together. In some embodiments, the analog switch circuit 112 may also include a first analog switch U1 and a second analog switch U2, and the signal input terminal IN of the first analog switch U1 is connected to the master CH3_ADC_EN2 and CH3_ADC_EN2 of the circuit 113 can specifically be ports used to control the first analog switch U1 in the Bluetooth chip, and the power supply terminal V+ of the first analog switch U1 is connected to RL3V0 of the main control circuit 113, and RL3V0 can specifically 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 terminal NC of the second analog switch U2, the normally open terminal NO of the first analog switch U1 is connected to the second terminal of the third resistor R3, and the first terminal of the third resistor R3 is connected to the branch The normally closed terminal NC of the first analog switch U1 is connected to the second terminal of the second resistor R2, the first terminal of the second resistor R2 is connected to the voltage division output node CH3_ADC1, and the ground terminal of the first analog switch U1 is grounded.

The signal input terminal IN of the second analog switch U2 is connected to CH3_ADC_EN1 of the main control circuit 113, CH3_ADC_EN1 can specifically be a port used to control the second analog switch U2 in the main control circuit 113, and the power supply terminal V+ of the second analog switch U2 is connected to the main control circuit 113. RL3V0 of the circuit 113, the common terminal COM of the second analog switch U2 is connected to RL3V0 of the main control circuit 113, the normally open terminal NO of the second analog switch U2 is connected to the second end of the first resistor R1, and the first end of the first resistor R1 is connected to Voltage divider output node CH3_ADC1. The main control circuit 113 is configured as:

The first resistor R1 , the second resistor R2 or the third resistor R3 is selected to be connected to 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 .

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 not detected that the probe 120 is inserted into the device main body 110, CH3_ADC_EN1 is pulled down to a logic low level, and at this time, the common terminal COM of the second analog switch U2 is connected to the normally closed terminal NC; at the same time, CH3_ADC_EN2 is pulled up as logic high level, at this time, the common terminal COM of the first analog switch U1 is switched to the normally open terminal NO, and the power supply current can be connected to RL3V0 of the second analog switch U2, pin 4 of the second analog switch U2, and Pin 3, pin 4 of the first analog switch U1, pin 1 of the first analog switch U1, and the third resistor R3 flow to the voltage-dividing output node CH3_ADC1, that is, the third resistor R3 and the interface circuit 111 are connected in series between the power supply and the ground terminal. between.

In this embodiment, the first analog switch U1 and the second analog switch U2 can be SGM3157 analog signal switch chips. This type of chip adopts a rail-to-rail working mode, and the switching time is short and the speed is fast, which meets the application occasions that require high-speed switching. .

In some other embodiments, the analog switch circuit 112 can also be composed of a JFET (Junction Field Effect Transistor) or a MOS transistor (Insulated Gate Field Effect Transistor), as long as the gear switching function of the analog switch circuit 112 can be realized.

Please refer to Fig. 4 and Fig. 5 together, the interface circuit 111 can include the earphone jack PJ-342, the earphone jack PJ-342 is used for inserting the probe 120, the pin 3 of the earphone jack PJ-342 is connected to the main CH3_PJ_EN1 of the control circuit 113, CH3_PJ_EN1 can specifically be the port used to detect whether the probe 120 is inserted in the Bluetooth chip, the pin 4 and pin 6 of the earphone socket PJ-342 are connected to the CH3_ADC1 detection pin of the main control circuit 113, and the earphone Pin 4 and pin 6 of socket PJ-342 are grounded through diode ED7 to achieve anti-static effect.

When the probe 120 is not inserted into the earphone jack PJ-342, the pin 8 and pin 9 of the earphone jack PJ-342 are disconnected, at this moment the CH3_PJ_EN1 of the main control circuit 113 is pulled up to high level; when the probe 120 is inserted When the earphone jack is PJ-342, pin 8 and pin 9 of the earphone jack PJ-342 are turned on, and CH3_PJ_EN1 is grounded at this time, so CH3_PJ_EN1 of the main control circuit 113 is pulled down from high level to low level, thereby triggering an interrupt, the main The control circuit 113 judges that the probe 120 is inserted according to the interruption.

Please refer to FIG. 1, FIG. 3 and FIG. 5 together. The voltage detection terminal CH3_PROBE_ADC1 of the main control circuit 113 is connected to the voltage division output node CH3_ADC1. The main control circuit 113 is also configured as:

If it is detected that the probe 120 is inserted into the device main body 110, that is, it is detected that the probe 120 is inserted into the earphone jack PJ-342, determine whether the voltage obtained by the voltage detection terminal CH3_PROBE_ADC1 exceeds the range;

If so, control the analog switch circuit 112 to switch between multiple gears until the voltage obtained by the voltage detection terminal CH3_PROBE_ADC1 meets the range, and obtain temperature data according to the voltage.

In this embodiment, the voltage range is 0V-3.0V, and when the voltage obtained by the voltage detection terminal CH3_PROBE_ADC1 is greater than or equal to 3.0V, it is determined that the voltage exceeds the range.

As an example, when it is detected that the probe 120 is plugged into the earphone jack PJ-342, the analog switch circuit 112 switches to the first gear to read the voltage value of CH3_PROBE_ADC1, if the voltage value of CH3_PROBE_ADC1 exceeds the range, then switch to The second gear is used to read the voltage value of CH3_PROBE_ADC1. If the voltage value of CH3_PROBE_ADC1 still exceeds the range at this time, switch to the third gear until the voltage value of CH3_PROBE_ADC1 does not exceed the range. At this time, the software of the main control circuit 113 passes By analog-to-digital conversion of this voltage, accurate temperature data can be obtained, which can then be stored in memory.

In some embodiments, the voltage detection terminal CH3_PROBE_ADC1 can adopt a timing mechanism to collect voltage in different periods, for example, the collection time interval is 1 second, that is, the voltage is collected sequentially every 1 second, and the interface circuit 111 and analog The power supply of the switching circuit 112 is used to achieve lower power consumption.

The following is a detailed introduction to the specific circuit directions of the first gear, the second gear and the third gear:

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 switched to the normally open terminal NO, at this time pin 4 and pin 3 of the second analog switch U2 are disconnected, and the first analog The switch U1 is in the open circuit state, and the power supply current flows to the voltage-dividing output node CH3_ADC1 after passing through RL3V0 of the second analog switch U2, pin 4 of the second analog switch U2, pin 1 of the second analog switch U2, and the first resistor R1. A resistor R1 acts as a voltage divider, and the analog switch circuit 112 is in the first gear.

When the CH3_ADC_EN1 of the second analog switch U2 is pulled down to a logic low level, the common terminal COM of the second analog switch U2 is connected to the normally closed terminal NC; the CH3_ADC_EN2 of the first analog switch U1 is pulled down to a logic low level, and the second The common terminal COM of an analog switch U1 is connected to the normally closed terminal NC, and the power supply current passes through RL3V0 of the second analog switch U2, pin 4 of the second analog switch U2, pin 3 of the second analog switch U2, and pin 3 of the first analog switch U1. Pin 4, pin 3 of the first analog switch U1, and the second resistor R2 flow to the voltage-dividing output node CH3_ADC1. At this time, the second resistor R2 acts as a voltage divider, and the analog switch circuit 112 is in the second gear.

When the CH3_ADC_EN1 of the second analog switch U2 is pulled down to a logic low level, the common terminal COM of the second analog switch U2 opens the normally closed terminal NC; the CH3_ADC_EN2 of the first analog switch U1 is pulled up to a logic high level, and the second When the common terminal COM of an analog switch U1 is connected to the normally open terminal NO, the power supply current passes through RL3V0 of the second analog switch U2, pin 4 of the second analog switch U2, pin 3 of the second analog switch U2, and pin 4 of the first analog switch U1. pin, pin 1 of the first analog switch U1, and the third resistor R3 then flow to the voltage divider output node CH3_ADC1. At this time, the third resistor R3 acts as a voltage divider, and the analog switch circuit 112 is in the third gear.

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

Record the gear information corresponding to the gear that meets the range;

If the voltage detection terminal CH3_PROBE_ADC1 acquires the voltage of the next cycle, the analog switch circuit 112 is controlled to switch to the gear corresponding to the gear information.

In this embodiment, the software of the main control circuit 113 records the gear information corresponding to the gear that satisfies the range, and the software of the main control circuit 113 can only record the gear information used in the last cycle to save storage space. For example, if the voltage of the previous cycle is satisfied after the analog switch circuit 112 switches to the second gear, the second gear is recorded as the gear information. When the voltage detection terminal CH3_PROBE_ADC1 obtains the voltage of the next cycle, the analog switch circuit 112 directly switches to the second gear, and then judges whether the voltage value of CH3_PROBE_ADC1 satisfies the range, which can reduce the number of times the analog switch circuit 112 switches gears to a certain extent, thereby reducing the time for collecting the voltage input by the probe 120, and also That is to reduce the temperature detection time, and finally reduce the power consumption of the whole machine.

In this embodiment, if the time interval between the current voltage obtained by CH3_PROBE_ADC1 and the previous voltage exceeds the set time value, it is judged that the current voltage is the voltage of the next cycle. In some other embodiments, the main control circuit 113 records that the probe 120 is at room temperature, and the voltage obtained by the voltage detection terminal CH3_PROBE_ADC1 is used as a reference signal. If the voltage difference between the voltage currently obtained by CH3_PROBE_ADC1 and the reference voltage exceeds the set voltage value , then it is judged that the current voltage is the voltage of the next cycle.

In some other embodiments, the main control circuit 113 can sort the gears of the analog switch circuit 112, and then switch the gears of the analog switch circuit 112 through a binary search algorithm until the voltage obtained by the voltage detection terminal CH3_PROBE_ADC1 meets the range.

As an example, the analog switch circuit 112 has gear 1, gear 2, gear 3, gear 4, gear 5, gear 6, gear 7, gear 8, gear 9 and gear 10, first switch the analog switch circuit 112 to the intermediate gear 5 to read the voltage value of CH3_PROBE_ADC1, if the voltage value of CH3_PROBE_ADC1 exceeds the range, then switch to the middle gear in the second half, that is, gear 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, switch to gear 9 and gear 10 in turn until the voltage value of CH3_PROBE_ADC1 does not exceed the range, which can also reduce the analog to a certain extent The number of times the switching circuit 112 switches gears.

In some other embodiments, the main control circuit 113 can also switch the gear of the analog switch circuit 112 through round-robin training. Specifically, the main control circuit 113 first sorts the multiple gears of the analog switch circuit 112, and then sequentially switches each gear of the analog switch circuit 112 according to the sorting until the voltage value of CH3_PROBE_ADC1 meets the range.

In some embodiments, the main control circuit 113 is further configured to:

If the main control circuit 113 obtains the temperature data, it controls the analog switch circuit 112 to switch to the gear with the largest resistance value.

Taking the third gear as the gear with the largest resistance value of the analog switch circuit 112 as an example, after the software of the main control circuit 113 obtains the temperature data according to the voltage satisfying the range, it controls the analog switch circuit 112 to switch to the third gear. The third resistor R3 with the largest resistance value acts as a voltage divider, which can reduce the current of the probe thermometer 100 to a minimum, thereby reducing the power consumption of the whole machine when it is in standby.

Please refer to FIG. 1 and FIG. 6 together. In some embodiments, the device body 110 further includes a Bluetooth module 115 , and the Bluetooth module 115 is connected to the main control circuit 113 . Wherein, the Bluetooth module 115 can be integrated into the Bluetooth chip 130 (see FIG. 2 for details). The main control circuit 113 is configured as:

After the device main body 110 is powered on, configure the broadcast period of the Bluetooth module 115;

Control the Bluetooth module 115 to send temperature data according to the broadcast cycle; and

After the temperature data is sent out, the bluetooth module 115 is controlled to enter the dormant state.

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

In this embodiment, the bluetooth module 115 is only used to receive control commands sent by bluetooth receiving devices such as mobile phones after entering the dormant state, and transmits the control commands to the main control circuit 113. The bluetooth module 115 does not send data externally in the dormant state, so Reduce power consumption. Or, in some other embodiments, after the Bluetooth module 115 enters the sleep state, the power supply of the Bluetooth module 115 is cut off to achieve lower power consumption.

Furthermore, after the temperature data is sent out, even if the broadcast duration is not over, the Bluetooth module 115 is immediately controlled to enter the sleep state, which can further reduce power consumption. For example, the bluetooth broadcast duration is 2s, if the temperature data has been sent in 1s, and the bluetooth broadcast duration has 1s left, then the bluetooth module 115 is still controlled to enter the dormant state, rather than waiting for the remaining 1s to end before controlling the bluetooth to enter the dormant state.

In some embodiments, the number of probes 120 includes multiple, the number of voltage detection terminals of the main control circuit 113 is consistent with the number of probes 120, and the number of interface circuits 111 and analog switch circuits 112 is consistent with the number of probes 120 , each probe 120 is respectively connected to the corresponding voltage detection terminal through the corresponding interface circuit 111 and the analog switch circuit 112 .

Please refer to FIG. 2 , FIG. 4 and FIG. 6 . Exemplarily, the probe 120 may include a first probe 121 , a second probe 122 , a third probe 123 and a fourth probe 124 . The circuit 113 is configured with voltage detection terminals CH1_PROBE_ADC1 , CH2_PROBE_ADC1 , CH3_PROBE_ADC1 and CH4_PROBE_ADC1 to acquire voltages input by the first probe 121 , the second probe 122 , the third probe 123 and the fourth probe 124 respectively.

In this embodiment, the main control circuit 113 is configured as:

Obtain multiple temperature data according to the voltage input by multiple voltage detection terminals;

The multiple temperature data are compressed and then sent through the bluetooth module 115 .

Wherein, the voltages input by multiple voltage detection terminals may be the voltages obtained by each voltage detection terminal at the same time. , CH2_PROBE_ADC1 obtain a voltage at the same time, according to the input voltage of CH1_PROBE_ADC1 and CH2_PROBE_ADC1, the temperature data of the first probe 121 and the temperature data of the second probe 122 can be respectively obtained, and then the temperature data of the first probe 121 and the temperature data of the second probe can be obtained The temperature data of the needle 122 is compressed and sent together through the Bluetooth module 115, which can reduce the data sending time.

The voltage input by multiple voltage detection terminals can also be the voltage obtained by each voltage detection terminal within a preset time period. The second probe 122 measures the temperature, and after an interval of 3 seconds, the third probe 123 is used to measure the temperature, then the time interval for CH1_PROBE_ADC1, CH2_PROBE_ADC1, and CH3_PROBE_ADC1 to obtain the voltage is within 10 seconds, then the temperature data of the first probe 121, the second probe The temperature data of 122 and the temperature data of the third probe 123 will be sent through the bluetooth module 115 after being compressed.

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, then the time interval between CH1_PROBE_ADC1 and CH2_PROBE_ADC1 to obtain the voltage is 10s If the time interval between CH1_PROBE_ADC1 and CH3_PROBE_ADC1 to obtain the voltage exceeds 10s, 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 Issued separately.

When the probe thermometer 100 provided in this embodiment does not detect that the probe 120 is inserted into the device main body 110, the main control circuit 113 controls the analog switch circuit 112 to switch to the gear with the largest resistance value, which can reduce the flow through the analog switch circuit 112. and the current of the main control circuit 113, thereby reducing the overall power consumption of the probe thermometer 100 and realizing the effect of low power consumption in the standby state.

Please refer to FIG. 1 and FIG. 7 together. The embodiment of the present application also provides a control method, which is applied to a probe thermometer 100. The probe thermometer 100 includes a device main body 110 and a probe 120. The probe 120 Removably inserted in 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 the 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 used as a voltage-dividing output node 114, and the analog switch circuit 112 has a plurality of gear positions, wherein different gear positions have different resistance values; the main control circuit 113 is connected to the interface circuit 111 and the analog switch circuit 112 , and connected to the voltage-dividing output node 114 .

The control method may include step S210 and step S220:

Step S210: Detect whether the probe 120 is inserted into the device main body 110 through the interface circuit 111;

Step S220: If it is not detected that the probe 120 is inserted into the device main body 110, control the analog switch circuit 112 to switch to the gear with the largest resistance value.

In some embodiments, the voltage detection terminal of the main control circuit 113 is connected to the voltage division output node 114, and the control method further includes the following steps:

If it is detected that the probe 120 is inserted into the device main body 110, it is judged whether the voltage obtained by the voltage detection terminal exceeds the range;

If yes, the analog switch circuit 112 is controlled to switch between multiple gears until the voltage obtained by the voltage detection terminal satisfies the range, and temperature data is obtained according to the voltage.

In some embodiments, the control method may also include the following steps:

Record the gear information corresponding to the gear that meets the range;

If the voltage detection terminal acquires the voltage of the next cycle, the analog switch circuit 112 is controlled to switch to the gear corresponding to the gear information.

In some embodiments, the control method may also include the following steps:

If the main control circuit 113 obtains the temperature data, it controls the analog switch circuit 112 to switch to the gear with the largest resistance value.

In some embodiments, the device main body 110 also includes a Bluetooth module 115, and the Bluetooth module 115 is connected to the main control circuit 113; the control method also includes the following steps:

After the device main body 110 is powered on, configure the broadcast period of the Bluetooth module 115;

Control the Bluetooth module 115 to send temperature data according to the broadcast cycle; and

After the temperature data is sent out, the bluetooth module 115 is controlled to enter the dormant state.

In some embodiments, the number of probes 120 includes multiple, and the number of voltage detection terminals is consistent with the number of probes 120; the control method can also ensure the following steps:

Obtain multiple temperature data according to the voltage input by each voltage detection terminal;

The multiple temperature data are compressed and then sent through the bluetooth module 115 .

The embodiment of the present application provides a control method applied to the probe thermometer 100. When the probe thermometer 100 does not detect that the probe 120 is inserted into the device main body 110, it can control the analog switch circuit 112 to switch to the one with the largest resistance value. The gear position can reduce the current size of the whole machine, thereby reducing the overall power consumption of the probe thermometer 100, and realizing the low power consumption effect in the standby state.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims (10)

1. A probe thermometer, characterized in that it comprises a device body and a probe, and the probe is detachably inserted in the device body, and the device body comprises: an interface circuit for detecting whether the probe is inserted into the device main 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 the connection point between the analog switch circuit and the interface circuit is used as a voltage division output node, The analog switch circuit has multiple gears, wherein different gears have different resistance values; and A main control circuit, connected to the interface circuit and the analog switch circuit, and connected to the voltage division output node, the main control circuit is configured as: If it is not detected that the probe is inserted into the main body of the device, the analog switch circuit is controlled to switch to a gear with the largest resistance value. 2. The probe thermometer according to claim 1, wherein the voltage detection terminal of the main control circuit is connected to the voltage divider output node, and the main control circuit is configured as: If it is detected that the probe is inserted into the main body of the device, it is determined whether the voltage obtained by the voltage detection terminal exceeds the range; If so, 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, wherein the main control circuit is configured as: Recording the gear information corresponding to the gear that satisfies the range; If the voltage detection terminal obtains the voltage of the next cycle, the analog switch circuit is controlled to switch to the gear corresponding to the gear information. 4. The probe thermometer according to claim 2, wherein the main control circuit is configured as: If the main control circuit acquires the temperature data, it controls the analog switch circuit to switch to the gear with the largest resistance value. 5. The probe thermometer according to claim 2, wherein the main body of the device further comprises a bluetooth module, the bluetooth module is connected to the main control circuit, and the main control circuit is configured as: After the main body of the device is turned on, configure the broadcast period of the Bluetooth module; controlling the bluetooth module to send the temperature data according to the broadcast period; and After the temperature data is sent out, the bluetooth module is controlled to enter a dormant state. 6. The probe thermometer according to claim 5, wherein the number of the probes comprises a plurality, and the number of the voltage detection terminals is consistent with the number of the probes; the main control circuit is configured as : Acquire a plurality of temperature data according to the voltage input by each of the voltage detection terminals; The multiple temperature data are compressed and then sent through the bluetooth module. 7. The probe thermometer according to claim 1, wherein said analog switch circuit comprises a first resistor, a second resistor and a third resistor, said first resistor, said second resistor and said first resistor The three resistors can be selectively connected to the interface circuit to switch the gear position of the analog switch circuit, and the resistance values of the first resistor, the second resistor and the third resistor increase sequentially; the main control The circuit is configured as: If it is not detected that the probe is inserted into the main body of the device, control the third resistor to be connected in series with the interface circuit, and disconnect the first resistor from the interface circuit, and the second resistor from the interface circuit. connection of the interface circuit. 8. The probe thermometer according to claim 7, wherein the analog switch circuit further comprises a first analog switch and a second analog switch, and the signal input end and the power end of the first analog switch are connected to the The main control circuit, the common terminal of the first analog switch is connected to the normally closed end of the second analog switch, the normally open end of the first analog switch is connected to the second end of the third resistor, and the third The first end of the resistor is connected to the voltage division output node; the normally closed end of the first analog switch is connected to the second end of the second resistor, and the first end of the second resistor is connected to the voltage division output node ; The signal input terminal, the power supply terminal and the common terminal of the second analog switch are all connected to the main control circuit, the normally open end of the second analog switch is connected to the second end of the first resistor, and the first resistor The first end of the voltage divider is connected to the output node; the main control circuit is configured as: The first resistor, the second resistor or the third resistor is selected 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 includes a device body and a probe, the probe is detachably inserted into the device body, the device body includes an interface circuit, an analog switch circuit and a main control 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 the connection point between the analog switch circuit and the interface circuit is used as a voltage divider output node, the analog switch circuit has multiple 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 divided voltage output node, so The control methods mentioned above include: Detecting whether the probe is inserted into the device main body through the interface circuit; If it is not detected that the probe is inserted into the main body of the device, the analog switch circuit is controlled to switch to a position with the largest resistance value. 10. The control method according to claim 9, wherein the voltage detection terminal of the main 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 main body of the device, it is determined whether the voltage obtained by the voltage detection terminal exceeds the range; If so, control the analog switch circuit to switch between multiple gears until the voltage meets the range, and acquire temperature data according to the voltage.

Images