Temperature measuring circuit structure and temperature probe

Abstract

The utility model provides a temperature measurement circuit structure and a temperature probe. The temperature measuring circuit structure comprises a first temperature measuring circuit, a second temperature measuring circuit, a charging module and a switching circuit, and the switching circuit is connected with the charging module. A third wire and a fourth wire of the second temperature measuring circuit are connected with the control chip through the PCBA board. A first charging wire of the charging module is connected with the control chip through the PCBA board; in the charging state, the switching circuit connects the third wire or the fourth wire to the charging module and serves as a second charging wire of the charging module. In the non-charging state, the switching circuit cuts off the third wire or the fourth wire serving as the second charging wire from the charging module. One wire in the handle is reduced through the switching circuit, so that interference to antenna signals is reduced, the use number and manufacturing difficulty of wire rods are reduced, the number of through holes in the ceramic piece is reduced, and the structural strength of the ceramic piece is enhanced.

Description

Technical Field

[0001] The utility model relates to a temperature measuring circuit structure and a temperature probe, belonging to the technical field of temperature probe devices. Background Art

[0002] The continuous streamlining and optimization of the internal structure of temperature probes, especially food temperature probes, is an important development direction in the field of temperature probe devices. A more streamlined internal structure can not only provide more physical space for the internal structure design of the temperature probe, but also further reduce the production cost of the product.

[0003] In the prior art, a food temperature probe usually includes a probe housing assembly and a temperature measuring circuit arranged inside the probe housing assembly. The probe housing assembly usually includes a probe body and a handle. The temperature measuring circuit includes a first temperature measuring circuit and a second temperature measuring circuit. The first temperature measuring circuit is usually arranged inside the tip of the probe body for inserting into the food and measuring the temperature inside the food. The second temperature measuring circuit is usually arranged in the handle. When the food temperature probe is inserted into the food, the handle is exposed to the outside of the food and measures the ambient temperature around the food.

[0004] Existing food temperature probes often include a charging module, which includes a first charging wire and a second charging wire. The first charging wire is typically connected to the probe body, serving as the first charging electrode, while the second charging wire is connected to the handle or other metal component, serving as the second charging electrode. When the food temperature probe is placed in the probe box, the probe body, serving as the first charging electrode, and the handle or other metal component, serving as the second charging electrode, connect to a charging power source to begin charging the battery in the temperature measurement circuit. Consequently, existing food temperature probes typically have at least four wires arranged in the handle: a third wire and a fourth wire for the second temperature measurement circuit, the second charging wire of the charging module, and an antenna. Technical issues associated with this include: first, the presence of at least three metal wires surrounding the antenna negatively impacts antenna signal stability; second, the greater the number of wires, the higher the production cost and manufacturing difficulty; and third, the wires in the handle typically need to pass through a first transition piece (typically a high-temperature-resistant, insulating ceramic piece). The ceramic piece requires pre-set perforations for the wires to pass through. Consequently, the greater the number of wires, the greater the number of perforations in the ceramic piece, increasing the manufacturing complexity and also deteriorating the stability and rigidity of the ceramic piece. Therefore, the four-wire layout method in the existing technology has a large room for improvement and needs to be further solved and improved. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a temperature measurement circuit structure and a temperature probe.

[0006] According to the implementation scheme of the present utility model, the first solution is provided as follows: a temperature measurement circuit structure, which is arranged in a temperature probe, including a PCBA board, a control chip, a first temperature measurement circuit, a second temperature measurement circuit, a battery, a charging module and an antenna, and also includes a switching circuit, and the switching circuit is connected to the charging module;

[0007] The first temperature measurement circuit includes a first wire and a second wire, and the first wire and the second wire are connected to the control chip through a PCBA board;

[0008] The second temperature measurement circuit includes a third wire and a fourth wire, and the third wire and the fourth wire are connected to the control chip through the PCBA board;

[0009] The charging module includes a first charging wire connected to the control chip via a PCBA board;

[0010] In the charging state, the switching circuit connects the third wire or the fourth wire to the charging module and serves as the second charging wire of the charging module;

[0011] In the non-charging state, the switching circuit disconnects the third wire or the fourth wire serving as the second charging wire from the charging module.

[0012] Furthermore, the temperature probe includes a probe housing assembly, which includes a metal probe body, a metal handle housing and a first transition connector. The first transition connector is arranged between the metal probe body and the metal handle housing and is non-conductive. The third wire, the fourth wire and the antenna pass through the first transition connector.

[0013] Furthermore, the first temperature measurement circuit further includes a first temperature measurement sensor, and the first temperature measurement sensor is arranged inside the tip of the metal probe body.

[0014] Furthermore, the first charging wire is connected to the metal probe body and the metal probe body serves as the first charging pole of the charging module.

[0015] Furthermore, the second temperature measurement circuit further includes a second temperature measurement sensor, and the second temperature measurement sensor is disposed in the metal handle housing;

[0016] The probe housing assembly further includes a metal cover plate and a second transition connector, wherein the metal cover plate is disposed at the end of the metal handle housing and the second transition connector is disposed between the metal handle housing and the metal cover plate, and the second transition connector is non-conductive;

[0017] The second temperature sensor is electrically connected to the metal handle shell or the metal cover plate, and the metal handle shell or the metal cover plate serves as the second charging pole of the charging module.

[0018] Furthermore, the second temperature sensor includes a second thermocouple consisting of a third wire and a fourth wire, the third wire and the fourth wire are connected at the metal cover and the third wire and / or the fourth wire are electrically connected to the metal cover, or the third wire and the fourth wire are connected inside the metal handle housing and are electrically connected to the metal cover through a fifth wire.

[0019] Furthermore, the second temperature sensor is a second thermistor, the second thermistor is fixed on the metal cover, and the third wire or the fourth wire is electrically connected to the metal cover through a fifth wire.

[0020] Furthermore, the temperature probe includes a probe housing assembly, which includes a metal probe body, a high-temperature insulating handle housing, and a metal cover. The high-temperature insulating handle housing is non-conductive, and the metal probe body and the metal cover are connected to both ends of the high-temperature insulating handle housing.

[0021] The first charging wire is connected to the metal probe body and the metal probe body serves as the first charging pole of the charging module. The second temperature sensor of the second temperature measurement circuit is electrically connected to the metal cover and the metal cover serves as the second charging pole of the charging module. The second temperature sensor includes a second thermocouple consisting of a third wire and a fourth wire. The third wire and the fourth wire are connected at the metal cover and the third wire and / or the fourth wire are electrically connected to the metal cover, or the third wire and the fourth wire are connected in a high-temperature insulating watch case and are electrically connected to the metal cover through a fifth wire.

[0022] Furthermore, the switching circuit includes a field effect transistor.

[0023] According to the implementation scheme of the present utility model, using the temperature measurement circuit structure in the first solution provided by the present utility model, a second solution is provided:

[0024] A temperature probe comprises any one of the above-mentioned temperature measurement circuit structures.

[0025] Furthermore, one end of the antenna is connected to the control chip through a PCBA board, and the other end of the antenna is connected to the metal handle housing.

[0026] Compared with the prior art, the technical solution provided by the present application has the following unique beneficial effects: the present solution adds a switching circuit, through which one of the third or fourth wires of the second temperature measurement circuit is used as the second charging wire of the charging module in the charging state, thereby reducing one metal wire inside the handle; in the non-charging state, the switching circuit cuts off the connection between the third or fourth wire and the charging module so that the second temperature measurement circuit maintains a normal working state.

[0027] By eliminating one charging wire from the charging module, the number of metal wires arranged around the antenna is reduced, reducing the environmental electromagnetic impact on the antenna signal reception and transmission, and reducing the signal interference problem caused by too many connecting wires in a closed and narrow space.

[0028] Reducing the number of wires reduces the manufacturing cost of the temperature probe and further reduces the manufacturing difficulty;

[0029] The number of perforations on the first transition connecting piece is reduced, the production cost of the first transition connecting piece is lowered, and the rigidity and firmness of the first transition connecting piece are enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] in:

[0032] Figure 1 Schematic diagram of the structure of a temperature measurement circuit in one embodiment;

[0033] Figure 2 It is a structural diagram of a temperature measurement circuit structure in the prior art;

[0034] Figure 3 is a schematic diagram of an embodiment in which the second temperature sensor is a second thermocouple;

[0035] Figure 4 FIG. 4 is a schematic diagram of an embodiment in which the second temperature sensor is a second thermistor.

[0036] Reference numerals:

[0037] 1-metal probe body; 2-metal handle shell; 3-first transition connector; 21-metal cover; 22-second transition connector; 4-PCBA board; 41-battery; 51-first temperature sensor; 52-second temperature sensor; 521-third wire; 522-fourth wire; 611-first charging wire; 612-second charging wire; 7-antenna. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0039] Example 1

[0040] like Figure 2 As shown, most existing food temperature probes include a charging module, which includes a first charging wire 611 and a second charging wire 612. Usually, the first charging wire 611 is connected to the probe body and the probe body serves as the first charging pole, and the second charging wire 612 is connected to the handle or other metal parts and serves as the second charging pole. When the food temperature probe is placed on the probe box, the probe body serves as the first charging pole, and the handle or other metal parts serve as the second charging pole and are connected to the charging power supply to start charging the battery 41 of the temperature measurement circuit. Therefore, the existing food temperature probe usually has at least 4 wires arranged on the handle, including the third wire 521 of the second temperature measurement circuit, the fourth wire 522, the second charging wire 612 of the charging module and the antenna 7. The technical problems it has include at least the following: First, at least three metal wires are arranged around the antenna 7, which have an adverse effect on the signal stability of the antenna 7; second, the more wires there are, the higher the production cost and the greater the manufacturing difficulty; third, the wires in the handle usually need to pass through the first transition connector 3 (usually a high-temperature resistant, insulating ceramic part), and the ceramic part needs to have preset perforations for the wires to pass through. Therefore, the more wires there are, the more perforations are set in the ceramic part, which not only increases the difficulty of the manufacturing process, but also the stability and rigidity of the ceramic part will deteriorate as the number of perforations increases.

[0041] In order to solve the above technical problems, this embodiment provides a temperature measurement circuit structure, such as Figure 1 As shown, the temperature measurement circuit structure includes not only the existing PCBA board 4, the control chip, the first temperature measurement circuit, the second temperature measurement circuit, the battery 41 and the antenna 7, but also a switching circuit, and the charging module only includes a first charging wire 611 but no second charging wire 612. The switching circuit is connected to the charging module and in the charging state, the third wire 521 or the fourth wire 522 of the second temperature measurement circuit is connected to the charging module and the third wire 521 or the fourth wire 522 is used as the second charging wire 612, thereby reducing the second charging wire 612 of the charging module in the prior art.

[0042] This solution adds a switching circuit, which uses one of the third wire 521 or the fourth wire 522 of the second temperature measurement circuit as the second charging wire 612 of the charging module in the charging state, thereby reducing one metal wire inside the handle. In the non-charging state, the switching circuit cuts off the connection between the third wire 521 or the fourth wire 522 and the charging module, thereby maintaining the second temperature measurement circuit in normal working condition.

[0043] By reducing the charging wire of one charging module, the metal wires arranged around the antenna 7 are reduced, the environmental electromagnetic impact on the signal reception and transmission of the antenna 7 is reduced, and the signal interference problem caused by too many connecting wires to the antenna 7 in a closed and narrow space is reduced; the reduction in wire material reduces the manufacturing cost of the temperature probe and further reduces the manufacturing difficulty; the number of perforations on the first transition connector 3 is reduced, the production cost of the first transition connector 3 is reduced and the rigidity and firmness of the first transition connector 3 are enhanced.

[0044] Example 2

[0045] This embodiment specifically provides a temperature measurement circuit structure, including a PCBA board 4, a control chip, a first temperature measurement circuit, a second temperature measurement circuit, a battery 41, a charging module and an antenna 7, and also includes a switching circuit, which is connected to the charging module;

[0046] Specifically, the first temperature measuring circuit includes a first wire and a second wire, which are connected to the control chip through the PCBA board 4. Usually, the first temperature measuring circuit is set at the tip of the metal probe body 1 to measure the innermost temperature of the food.

[0047] The second temperature measurement circuit includes a third wire 521 and a fourth wire 522. The third wire 521 and the fourth wire 522 are connected to the control chip via the PCBA board 4. The second temperature measurement circuit is disposed within the metal handle housing 2. When measuring the temperature of food, the metal handle is exposed to the outside of the food. The second temperature measurement circuit is used to measure the ambient temperature of the food.

[0048] The charging module includes a first charging wire 611, which is connected to the control chip through the PCBA board 4; the difference from the prior art is that the charging module only includes the first charging wire 611.

[0049] In the charging state, the switching circuit connects the third wire 521 or the fourth wire 522 to the charging module and serves as the second charging wire 612 of the charging module; in the non-charging state, the switching circuit disconnects the third wire 521 or the fourth wire 522 serving as the second charging wire 612 from the charging module.

[0050] Specifically, the temperature probe includes a probe housing assembly, which includes a metal probe body 1, a metal handle housing 2, and a first transition piece 3. The first transition piece 3 is disposed between the metal probe body 1 and the metal handle housing 2 and is non-conductive. The third wire 521, the fourth wire 522, and the antenna 7 pass through the first transition piece 3. The metal probe body 1 is connected to the first charging wire 611 and serves as a first charging electrode.

[0051] Specifically, the metal probe body 1 can be further divided into two sections, a tip tube section and a main stainless steel shell. The tip tube section and the main stainless steel shell are laser welded to achieve a sealed and reliable connection.

[0052] The first transition connector 3 is preferably a ceramic component, which has high temperature resistance and insulation properties.

[0053] Specifically, the probe housing assembly also includes a metal cover plate 21 and a second transition connector 22, wherein the metal cover plate 21 is arranged at the end of the metal handle housing 2 and the second transition connector 22 is arranged between the metal handle housing 2 and the metal cover plate 21, and the second transition connector 22 is non-conductive; the second temperature sensor 52 is electrically connected to the metal handle housing 2 or the metal cover plate 21 and uses the metal handle housing 2 or the metal cover plate 21 as the second charging pole of the charging module.

[0054] The second charging electrode is preferably a metal cover 21. First, the distance between the metal cover 21 and the food is the farthest among all structures of the food temperature probe. Second, the metal cover 21 as the second charging electrode is also related to the location of the second temperature measurement circuit. The second temperature measurement circuit needs to respond quickly to the ambient temperature. In traditional solutions, the ambient temperature must pass through the medium including the handle and the air inside the handle to be transmitted to the second temperature measurement circuit. This results in a slow response time for the second temperature measurement circuit, inaccurate temperature measurement results, and poor durability. The metal cover 21 is preferably used as the second charging electrode. The second temperature sensor 52 can be further disposed on the metal cover 21, so that the ambient temperature is transmitted to the second temperature measurement circuit only through the metal cover 21 medium. The handle as an integral structure requires a certain thickness to ensure overall rigidity, while the metal cover 21 is disposed at the end and can be made thinner, thereby quickly responding to the ambient temperature and achieving higher ambient temperature measurement accuracy. In particular, attaching the second temperature sensor to the metal cover 21 rather than suspending it inside the handle results in faster response and higher measurement accuracy.

[0055] Example 3

[0056] like Figure 3-4 As shown, this embodiment specifically provides two types of second temperature measuring sensors 52 .

[0057] Preferably, the second temperature sensor 52 is a thermocouple structure, and the second temperature sensor 52 includes a second thermocouple consisting of a third wire 521 and a fourth wire 522, the third wire 521 and the fourth wire 522 are connected at the metal cover 21, and the third wire 521 and / or the fourth wire 522 are electrically connected to the metal cover 21.

[0058] In another embodiment, the second thermocouple is not directly connected to the metal cover 21, but is suspended in the metal handle housing 2 or the high-temperature insulating handle housing, and is then electrically connected to the metal cover through a fifth wire.

[0059] The structure of the thermocouple is simpler, and in this case the thermocouple is directly connected to the metal cover 21, which is not affected by the intermediate medium, resulting in higher measurement accuracy and faster response speed;

[0060] Alternatively, the second temperature sensor 52 is a thermistor, a second thermistor fixed to the metal cover 21, and the third wire 521 or the fourth wire 522 is electrically connected to the metal cover 21 via a fifth wire. In this solution, the second thermistor can be fixed to the metal cover 21. However, to ensure that the switching circuit can use the third wire 521 or the fourth wire 522 as the second charging wire 612 in the charging state, the third wire 521 or the fourth wire 522 needs to be electrically connected to the metal cover 21 via the fifth wire.

[0061] Likewise, the first temperature sensor 51 may also be a thermocouple structure or a thermistor structure.

[0062] Example 4

[0063] In another trial solution, the handle adopts a non-metallic high-temperature insulating handle shell, that is, the temperature probe includes a probe shell assembly, which includes a metal probe body 1, a high-temperature insulating handle shell and a metal cover 21. The high-temperature insulating handle shell is non-conductive, and the metal probe body 1 and the metal cover 21 are connected to both ends of the high-temperature insulating handle shell.

[0064] The first charging wire 611 is connected to the metal probe body 1 and the metal probe body 1 is used as the first charging pole of the charging module. The second temperature sensor 52 of the second temperature measurement circuit is electrically connected to the metal cover 21 and the metal cover 21 is used as the second charging pole of the charging module. The second temperature sensor 52 includes a second thermocouple composed of a third wire 521 and a fourth wire 522. The third wire 521 and the fourth wire 522 are connected at the metal cover 21 and the third wire 521 and / or the fourth wire 522 are electrically connected to the metal cover 21, or the third wire 521 and the fourth wire 522 are connected in a high-temperature insulating watch case and are electrically connected to the metal cover 21 through a fifth wire.

[0065] Example 5

[0066] This embodiment specifically provides a switching circuit, which includes a field effect transistor.

[0067] In the charging state, the field effect transistor is in a low-level conduction state, and the connection between the third wire 521 or the fourth wire 522 and the charging module is connected, and the third wire 521 or the fourth wire 522 serves as the second charging wire 612 of the charging module. In the non-charging state, the field effect transistor is in a high-level disconnection state, and the switching circuit disconnects the third wire 521 or the fourth wire 522 serving as the second charging wire 612 from the charging module.

[0068] Obviously, the high and low pad states of the field effect tube are interchangeable, and the third wire 521 or the fourth wire 522 can be connected to or disconnected from the charging module through a simple circuit structure.

[0069] Obviously, other similar components or circuit structures also fall within the protection scope of this utility model.

[0070] Example 6

[0071] This embodiment provides a temperature probe including any of the above-mentioned temperature measurement circuit structures.

[0072] Furthermore, one end of the antenna 7 can be connected to the metal handle shell 2, thereby reducing the use of the handle shell as the antenna 7. Its signal transmission is not affected by the direction of the probe placement, and the metal handle shell 2 serves as the antenna 7, and its signal transmission is in the outer layer. The signal transmission is not affected by the shell components, nor is it interfered with by other sensor metal wires inside. The transmission distance is more stable and farther, and the antenna 7 can also be directly connected to the metal handle shell 2 after passing through the first transition connector 3. The size of the antenna 7 can be shorter, and it is less interfered with by other sensor metal wires.

[0073] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above embodiments only express several implementation methods of the present application. The description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of this application. It should be pointed out that for ordinary technicians in this field, without departing from the concept of this application, several variations and improvements can be made, which all fall within the scope of protection of this application.

[0074] It should be noted that when an element is referred to as being "fixed on" or "set on" another component, it may be directly on the other component or indirectly set on the other component; when a component is referred to as being "connected to" another component, it may be directly connected to the other component or indirectly connected to the other component. It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting this application.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0076] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

Claims

1. A temperature measurement circuit structure, which is arranged in a temperature probe, including a PCBA board, a control chip, a first temperature measurement circuit, a second temperature measurement circuit, a battery, a charging module and an antenna, characterized in that: Also included is a switching circuit, wherein the switching circuit is connected to the charging module; The first temperature measurement circuit includes a first wire and a second wire, and the first wire and the second wire are connected to the control chip through a PCBA board; The second temperature measurement circuit includes a third wire and a fourth wire, and the third wire and the fourth wire are connected to the control chip through the PCBA board; The charging module includes a first charging wire connected to the control chip via a PCBA board; In the charging state, the switching circuit connects the third wire or the fourth wire to the charging module and serves as the second charging wire of the charging module; In the non-charging state, the switching circuit disconnects the third wire or the fourth wire serving as the second charging wire from the charging module.

2. The temperature measurement circuit structure according to claim 1, characterized in that: The temperature probe includes a probe housing assembly, which includes a metal probe body, a metal handle housing and a first transition connector. The first transition connector is arranged between the metal probe body and the metal handle housing and is non-conductive. The third wire, the fourth wire and the antenna pass through the first transition connector.

3. The temperature measurement circuit structure according to claim 2, characterized in that: The first charging wire is connected to the metal probe body and the metal probe body serves as the first charging pole of the charging module.

4. The temperature measurement circuit structure according to claim 3, characterized in that: The second temperature measurement circuit further includes a second temperature measurement sensor, and the second temperature measurement sensor is disposed in the metal handle housing; The probe housing assembly further includes a metal cover plate and a second transition connector, wherein the metal cover plate is disposed at the end of the metal handle housing and the second transition connector is disposed between the metal handle housing and the metal cover plate, and the second transition connector is non-conductive; The second temperature sensor is electrically connected to the metal handle shell or the metal cover plate, and the metal handle shell or the metal cover plate serves as the second charging pole of the charging module.

5. The temperature measurement circuit structure according to claim 4, characterized in that: The second temperature measuring sensor includes a second thermocouple consisting of a third wire and a fourth wire; The third wire and the fourth wire are connected at the metal cover and the third wire and / or the fourth wire are electrically connected to the metal cover, or the third wire and the fourth wire are connected in the metal handle housing and are electrically connected to the metal cover through the fifth wire.

6. The temperature measurement circuit structure according to claim 4, characterized in that: The second temperature measuring sensor is a second thermistor, which is fixed on the metal cover. The third wire or the fourth wire is electrically connected to the metal cover through the fifth wire.

7. The temperature measurement circuit structure according to claim 1, characterized in that: The temperature probe includes a probe housing assembly, which includes a metal probe body, a high-temperature insulating handle housing, and a metal cover. The high-temperature insulating handle housing is non-conductive, and the metal probe body and the metal cover are connected to both ends of the high-temperature insulating handle housing. The first charging wire is connected to the metal probe body and the metal probe body serves as the first charging pole of the charging module. The second temperature sensor of the second temperature measurement circuit is electrically connected to the metal cover and the metal cover serves as the second charging pole of the charging module. The second temperature sensor includes a second thermocouple consisting of a third wire and a fourth wire. The third wire and the fourth wire are connected at the metal cover and the third wire and / or the fourth wire are electrically connected to the metal cover, or the third wire and the fourth wire are connected in a high-temperature insulating watch case and are electrically connected to the metal cover through a fifth wire.

8. The temperature measurement circuit structure according to claim 1, characterized in that: The switching circuit includes a field effect transistor.

9. A temperature probe, characterized in that: The invention comprises a temperature measurement circuit structure as claimed in any one of claims 1 to 8.

10. The temperature probe according to claim 9, characterized in that One end of the antenna is connected to the control chip through the PCBA board, and the other end of the antenna is connected to the metal handle shell.

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