CN210893466U - Miniature temperature measuring sensor - Google Patents

Abstract

The utility model relates to the technical field of electronics, in particular to a miniature temperature measurement sensor, which is provided with a power supply circuit to provide a working power supply for a control circuit; the antenna circuit is electrically connected with the control circuit to realize data sending and receiving, the control circuit can transmit the received temperature data to the temperature measuring circuit, and when the system needs to detect the temperature, the temperature measuring circuit can convert the detected voltage into a temperature value and store the temperature value in a chip of the control circuit, thereby realizing the online monitoring of the temperature of the joint part; the miniature temperature sensor of this scheme design's circuit structure is simple, can reduce the space of PCB cloth board greatly when adopting small-size PCB encapsulation, is favorable to realizing temperature sensor's miniaturization.

Description

Miniature temperature measuring sensor

Technical Field

The utility model relates to the field of electronic technology, in particular to miniature temperature sensor.

Background

The potential fault of over-temperature rise of the contact parts of the electrical equipment caused by factors such as material aging, poor contact, current overload and the like needs to be monitored on line. In the prior art, a built-in battery is mostly adopted for supplying power to realize wireless monitoring, or a surface acoustic wave technology is adopted for carrying out passive wireless online temperature detection. The wireless temperature measurement sensor generally comprises an LDO conversion circuit, an MCU main control circuit and a radio frequency module circuit, wherein the LDO conversion circuit is processed in a voltage reduction mode, the radio frequency module circuit adopts a whole integrated module with MCU main control, and the MCU main control circuit adopts a common low-power consumption MCU processing program.

With the above circuit configuration, there are several problems: the LDO conversion circuit is processed in a voltage reduction mode, so that the whole system can be driven to operate only by a large input voltage signal, and the whole machine product is large in size; the radio frequency module circuit and the MCU master control circuit are added together to use two MCU singlechips, so that the programming is complex, the occupied volume is large, and the miniaturization cannot be realized.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to solve the technical problems that: a miniature temperature sensor is provided.

In order to solve the technical problem, the utility model discloses a technical scheme be:

a miniature temperature measurement sensor comprises a power taking circuit, a control circuit, a temperature measurement circuit and an antenna circuit, wherein the control circuit is electrically connected with the power taking circuit, the temperature measurement circuit and the antenna circuit respectively;

the temperature measuring circuit comprises a resistor R3, a resistor R4 and a capacitor C12, one end of the resistor R3 is electrically connected with one end of the capacitor C12, the other end of the capacitor C12 is grounded, the other end of the resistor R3 is electrically connected with one end of the resistor R4, and the other end of the resistor R4 is grounded.

Further, the power taking circuit comprises an inductor L2, a capacitor C10, an electrolytic capacitor CE1, an electrolytic capacitor CE2, a diode D1, a zener diode ZD1 and a chip U2;

the chip U2 comprises a first pin, a second pin, a third pin and a fourth pin, the first pin of the chip U2 is electrically connected with the third pin of the chip U2, one end of a capacitor C10, the cathode of a diode D1, one end of a zener diode ZD1 and one end of an inductor L2 respectively, the other end of the inductor L2 is electrically connected with the other end of the zener diode ZD1, the other end of the inductor L2 and the other end of the zener diode ZD1 are both grounded, the other end of the capacitor C10 is electrically connected with the second pin of the chip U2, one end of the electrolytic capacitor CE1 and one end of the electrolytic capacitor CE2 respectively, the other end of the capacitor C10, the second pin of the chip U2, one end of the electrolytic capacitor CE1 and one end of the electrolytic capacitor CE2 are all grounded, the other end of the electrolytic capacitor CE1 is electrically connected with the fourth pin of the chip U2 and the other end of the electrolytic capacitor CE2 respectively.

Further, the antenna circuit comprises a resistor R2, an inductor L3, an inductor L5, an inductor L6, an inductor L7, an inductor L8, a capacitor C11, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17 and an antenna L4;

one end of the inductor L3 is electrically connected to one end of the capacitor C11 and one end of the inductor L5, the other end of the inductor L5 is electrically connected to one end of the capacitor C15 and one end of the inductor L8, the other end of the inductor L8 is electrically connected to one end of the capacitor C17, the other end of the capacitor C17 is grounded, the other end of the capacitor C15 is electrically connected to one end of the capacitor C16, the other end of the inductor L3 and one end of the inductor L6, the other end of the inductor L6 is electrically connected to one end of the capacitor C13 and one end of the inductor L7, the other end of the capacitor C13 is grounded, the other end of the inductor L7 is electrically connected to one end of the capacitor C14 and one end of the resistor R2, the other end of the capacitor C14 is grounded, and the other end of the resistor R2 is electrically connected to the antenna L4.

Further, the control circuit comprises a chip U1, a resistor R1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, an X capacitor CX1, a Y capacitor CY1 and an inductor L1;

the chip U17 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin, a ninth pin, a tenth pin, an eleventh pin, a twelfth pin, a thirteenth pin and a fourteenth pin, the first pin of the chip U1, the fourth pin of the chip U1, the seventh pin of the chip U1, the tenth pin of the chip U1 and the twelfth pin of the chip U1 are all grounded, the second pin of the chip U1 is respectively and electrically connected with one end of the capacitor C8 and one end of an X capacitor CX1, the other end of the capacitor C8 is grounded, the other end of the X capacitor CX1 is electrically connected with one end of the capacitor C9, the other end of the capacitor C9 is grounded, the fifth pin of the chip U1 is respectively and electrically connected with one end of the capacitor C3, one end of the capacitor C4, one end of the capacitor C5 and one end of the capacitor C6, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5 and the other end of the capacitor C6 are all grounded, a sixth pin of the chip U1 is electrically connected with one end of the capacitor C7, the other end of the capacitor C7 is grounded, an eighth pin of the chip U1 is electrically connected with one end of the capacitor C2 through the inductor L1, the other end of the capacitor C2 is grounded, an eleventh pin of the chip U1 is electrically connected with one end of the resistor R1 and one end of the capacitor C1 respectively, the other end of the capacitor C1 is grounded, a thirteenth pin of the chip U1 is electrically connected with a fourteenth pin of the chip U1 through the Y capacitor CY1, and the Y capacitor CY1 is grounded.

The beneficial effects of the utility model reside in that:

the power supply circuit is arranged to provide a working power supply for the whole temperature measurement system, so that the normal operation of the whole temperature measurement system is ensured; the temperature measuring circuit converts the measured temperature value into a voltage value, transmits the voltage value to the control circuit for analysis and judgment, and transmits the voltage value to the receiving terminal through the antenna circuit, thereby realizing the online monitoring of the temperature of the joint part; the miniature temperature sensor of this scheme design's circuit structure is simple, can reduce the space of PCB cloth board greatly when adopting small-size PCB encapsulation, is favorable to realizing temperature sensor's miniaturization.

Drawings

Fig. 1 is a block diagram of an overall circuit module of a miniature temperature measuring sensor according to the present invention;

fig. 2 is a schematic circuit diagram of a temperature measuring circuit of a miniature temperature measuring sensor according to the present invention;

fig. 3 is a schematic circuit diagram of a power-taking circuit of a micro temperature measuring sensor according to the present invention;

fig. 4 is a schematic circuit diagram of an antenna circuit of a miniature temperature sensor according to the present invention;

fig. 5 is a schematic circuit diagram of a control circuit of a micro temperature measuring sensor according to the present invention;

description of reference numerals:

1. a power taking circuit; 2. a control circuit; 3. a temperature measuring circuit; 4. an antenna circuit.

Detailed Description

In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

Referring to fig. 1, the technical solution provided by the present invention is:

a miniature temperature measurement sensor comprises a power taking circuit, a control circuit, a temperature measurement circuit and an antenna circuit, wherein the control circuit is electrically connected with the power taking circuit, the temperature measurement circuit and the antenna circuit respectively;

the temperature measuring circuit comprises a resistor R3, a resistor R4 and a capacitor C12, one end of the resistor R3 is electrically connected with one end of the capacitor C12, the other end of the capacitor C12 is grounded, the other end of the resistor R3 is electrically connected with one end of the resistor R4, and the other end of the resistor R4 is grounded.

From the above description, the beneficial effects of the present invention are:

the power supply circuit is arranged to provide a working power supply for the whole temperature measurement system, so that the normal operation of the whole temperature measurement system is ensured; the temperature measuring circuit converts the measured temperature value into a voltage value, transmits the voltage value to the control circuit for analysis and judgment, and transmits the voltage value to the receiving terminal through the antenna circuit, thereby realizing the online monitoring of the temperature of the joint part; the miniature temperature sensor of this scheme design's circuit structure is simple, can reduce the space of PCB cloth board greatly when adopting small-size PCB encapsulation, is favorable to realizing temperature sensor's miniaturization.

Further, the power taking circuit comprises an inductor L2, a capacitor C10, an electrolytic capacitor CE1, an electrolytic capacitor CE2, a diode D1, a zener diode ZD1 and a chip U2;

the chip U2 comprises a first pin, a second pin, a third pin and a fourth pin, the first pin of the chip U2 is electrically connected with the third pin of the chip U2, one end of a capacitor C10, the cathode of a diode D1, one end of a zener diode ZD1 and one end of an inductor L2 respectively, the other end of the inductor L2 is electrically connected with the other end of the zener diode ZD1, the other end of the inductor L2 and the other end of the zener diode ZD1 are both grounded, the other end of the capacitor C10 is electrically connected with the second pin of the chip U2, one end of the electrolytic capacitor CE1 and one end of the electrolytic capacitor CE2 respectively, the other end of the capacitor C10, the second pin of the chip U2, one end of the electrolytic capacitor CE1 and one end of the electrolytic capacitor CE2 are all grounded, the other end of the electrolytic capacitor CE1 is electrically connected with the fourth pin of the chip U2 and the other end of the electrolytic capacitor CE2 respectively.

From the above description, the power-taking circuit is connected with the high-voltage bus or the high-voltage cable, passes through the inductor L2 to generate voltage on the inductor L2, and provides back-end conversion voltage for use, so that the power-taking circuit is a key device for realizing the working power supply of the temperature measuring sensor in the scheme; because the voltage generated by the front-end inductor L2 (induction coil) is alternating voltage, rectification is needed, the rectification is realized by arranging the diode D1, the diode D1 can adopt a diode with the model of MBR0530WS, the conducting voltage of the device is low, the front-end voltage cannot be excessively lost, and the phenomenon of insufficient load carrying capacity is avoided; the voltage stabilizing diode is arranged to play a role in stabilizing voltage and protect the voltage of the input end of the rear-end chip U2; playing the energy storage effect through setting up electrolytic capacitor CE1 and electrolytic capacitor CE2, because induced voltage is lower, need be to induced voltage energy storage and filtering, prevent to appear the not enough phenomenon of on-load capacity, chip U2 can just use the LDO chip (the model is NCP551SN33T1G), and the low dropout satisfies when voltage input is lower, can guarantee that output voltage and electric current satisfy the system requirement.

Further, the antenna circuit comprises a resistor R2, an inductor L3, an inductor L5, an inductor L6, an inductor L7, an inductor L8, a capacitor C11, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17 and an antenna L4;

one end of the inductor L3 is electrically connected to one end of the capacitor C11 and one end of the inductor L5, the other end of the inductor L5 is electrically connected to one end of the capacitor C15 and one end of the inductor L8, the other end of the inductor L8 is electrically connected to one end of the capacitor C17, the other end of the capacitor C17 is grounded, the other end of the capacitor C15 is electrically connected to one end of the capacitor C16, the other end of the inductor L3 and one end of the inductor L6, the other end of the inductor L6 is electrically connected to one end of the capacitor C13 and one end of the inductor L7, the other end of the capacitor C13 is grounded, the other end of the inductor L7 is electrically connected to one end of the capacitor C14 and one end of the resistor R2, the other end of the capacitor C14 is grounded, and the other end of the resistor R2 is electrically connected to the antenna L4.

From the above description, the inductor L6, the capacitor C13, the inductor L7, the capacitor C14, the inductor L3, the capacitor C11, the inductor L8, and the capacitor C17 respectively form an LC filter for filtering radio frequency signals, the inductor L5 is used for preventing higher harmonics generated by oscillation from interfering with a power supply, protecting a chip pin, and the capacitor C16 is not provided with a low filter capacitor, and plays a role in protecting signal stability.

Further, the control circuit comprises a chip U1, a resistor R1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, an X capacitor CX1, a Y capacitor CY1 and an inductor L1;

the chip U17 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin, a ninth pin, a tenth pin, an eleventh pin, a twelfth pin, a thirteenth pin and a fourteenth pin, the first pin of the chip U1, the fourth pin of the chip U1, the seventh pin of the chip U1, the tenth pin of the chip U1 and the twelfth pin of the chip U1 are all grounded, the second pin of the chip U1 is respectively and electrically connected with one end of the capacitor C8 and one end of an X capacitor CX1, the other end of the capacitor C8 is grounded, the other end of the X capacitor CX1 is electrically connected with one end of the capacitor C9, the other end of the capacitor C9 is grounded, the fifth pin of the chip U1 is respectively and electrically connected with one end of the capacitor C3, one end of the capacitor C4, one end of the capacitor C5 and one end of the capacitor C6, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5 and the other end of the capacitor C6 are all grounded, a sixth pin of the chip U1 is electrically connected with one end of the capacitor C7, the other end of the capacitor C7 is grounded, an eighth pin of the chip U1 is electrically connected with one end of the capacitor C2 through the inductor L1, the other end of the capacitor C2 is grounded, an eleventh pin of the chip U1 is electrically connected with one end of the resistor R1 and one end of the capacitor C1 respectively, the other end of the capacitor C1 is grounded, a thirteenth pin of the chip U1 is electrically connected with a fourteenth pin of the chip U1 through the Y capacitor CY1, and the Y capacitor CY1 is grounded.

From the above description, a reset circuit is formed by arranging the resistor R1 and the capacitor C1, the chip can be reset automatically and restarted when the chip U1 is halted, the Y capacitor CY1 and the X capacitor CX1 are crystal oscillator devices and are used as standard matching devices for starting oscillation of the chip U1, the capacitor C8 and the capacitor C9 are matched with the X capacitor CX1 to form an oscillation circuit, the capacitor C7 is 1.27V to adjust a power supply decoupling capacitor, the inductor L1 and the capacitor C2 form an LC filter circuit for filtering a direct-current power supply, and the capacitor C3, the capacitor C4, the capacitor C5 and the capacitor C6 are power supply filter capacitors and are used for filtering the power supply in circuit layout.

Referring to fig. 1 to 5, a first embodiment of the present invention is:

referring to fig. 1, a micro temperature measuring sensor includes a power supply circuit 1, a control circuit 2, a temperature measuring circuit 3, and an antenna circuit 4, where the control circuit 2 is electrically connected to the power supply circuit 1, the temperature measuring circuit 3, and the antenna circuit 4, respectively.

Referring to fig. 5, the control circuit 2 includes a chip U1 (model No. CC1310F128RSM), a resistor R1 (resistance value 100K), a capacitor C1 (capacitance value 100nF), a capacitor C2 (capacitance value 100nF), a capacitor C3 (capacitance value 100nF), a capacitor C4 (capacitance value 100nF), a capacitor C5 (capacitance value 100nF), a capacitor C6 (capacitance value 100nF), a capacitor C7 (capacitance value 1uF), a capacitor C8 (capacitance value 12pF), a capacitor C9 (capacitance value 12pF), an X capacitor CX1, a Y capacitor CY1, and an inductor L1 (model No. SWEL1005C6.8NJT);

the chip U17 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin, a ninth pin, a tenth pin, an eleventh pin, a twelfth pin, a thirteenth pin and a fourteenth pin, the first pin of the chip U1, the fourth pin of the chip U1, the seventh pin of the chip U1, the tenth pin of the chip U1 and the twelfth pin of the chip U1 are all grounded, the second pin of the chip U1 is respectively and electrically connected with one end of the capacitor C8 and one end of an X capacitor CX1, the other end of the capacitor C8 is grounded, the other end of the X capacitor CX1 is electrically connected with one end of the capacitor C9, the other end of the capacitor C9 is grounded, the fifth pin of the chip U1 is respectively and electrically connected with one end of the capacitor C3, one end of the capacitor C4, one end of the capacitor C5 and one end of the capacitor C6, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5 and the other end of the capacitor C6 are all grounded, a sixth pin of the chip U1 is electrically connected with one end of the capacitor C7, the other end of the capacitor C7 is grounded, an eighth pin of the chip U1 is electrically connected with one end of the capacitor C2 through the inductor L1, the other end of the capacitor C2 is grounded, an eleventh pin of the chip U1 is electrically connected with one end of the resistor R1 and one end of the capacitor C1 respectively, the other end of the capacitor C1 is grounded, a thirteenth pin of the chip U1 is electrically connected with a fourteenth pin of the chip U1 through the Y capacitor CY1, and the Y capacitor CY1 is grounded.

Referring to fig. 2, the temperature measuring circuit 3 includes a resistor R3 (thermistor, resistance value is 50K Ω), a resistor R4 (resistance value is 499K Ω), and a capacitor C12 (capacitance value is 100nF), one end of the resistor R3 is electrically connected to one end of the capacitor C12 and is connected to the VDDS pin of the chip U1, the other end of the capacitor C12 is grounded, the other end of the resistor R3 is electrically connected to one end of the resistor R4 and is connected to the RMDZ pin of the chip U1, and the other end of the resistor R4 is grounded.

The resistor R3 is an NTC thermistor, the resistance of which is related to the change of temperature, when the system needs to monitor the temperature, the resistor R3 and the resistor R4 perform voltage division, and the JTAG _ TCKC pin of the chip U1 converts the voltage (the divided voltage thereof is 3.3V × R3/(499+ R3)) at the RMDZ point (the intersection point between the other end of the resistor R3 and one end of the resistor R4) into a temperature value, and then stores the temperature value into the chip U1 of the control circuit 2.

Referring to fig. 3, the power taking circuit 1 includes an inductor L2 (with an inductance of 860mH), a capacitor C10 (with a capacitance of 23uF), an electrolytic capacitor CE1 (with a capacitance of 470uF and a voltage of 10V), an electrolytic capacitor CE2 (with a capacitance of 470uF and a voltage of 10V), a diode D1 (with a model of MBR0530W), a zener diode ZD1 (with a model of SMBJ90CA), and a chip U2 (with a model of NCP551SN33T1G), where the electrolytic capacitor CE1 and the electrolytic capacitor CE2 are tantalum electrolytic capacitors, which have an energy storage function, and since the induced voltage is low, energy storage and filtering are required for the induced voltage, thereby preventing insufficient carrying capacity;

the chip U2 comprises a first pin, a second pin, a third pin and a fourth pin, the first pin of the chip U2 is electrically connected with the third pin of the chip U2, one end of a capacitor C10, the cathode of a diode D1, one end of a zener diode ZD1 and one end of an inductor L2 respectively, the other end of the inductor L2 is electrically connected with the other end of the zener diode ZD1, the other end of the inductor L2 and the other end of the zener diode ZD1 are both grounded, the other end of the capacitor C10 is electrically connected with the second pin of the chip U2, one end of the electrolytic capacitor CE1 and one end of the electrolytic capacitor CE2 respectively, the other end of the capacitor C10, the second pin of the chip U2, one end of the electrolytic capacitor CE1 and one end of the electrolytic capacitor CE2 are all grounded, the other end of the electrolytic capacitor CE1 is electrically connected with the fourth pin of the chip U2 and the other end of the electrolytic capacitor CE2 respectively.

Referring to fig. 4, the antenna circuit 4 includes a resistor R2, an inductor L3 (model SWEL1005C7.5NJT), an inductor L5 (model SWEL1005C7.5NJT), an inductor L6 (model SWEL1005C7.5NJT), an inductor L7 (model SWEL1005C6.8NJT), an inductor L8 (model SWEL1005C7.5NJT), a capacitor C11 (capacitance value 3.6pF), a capacitor C13 (capacitance value 6.2pF), a capacitor C14 (capacitance value 3.3pF), a capacitor C15 (capacitance value 3.6pF), a capacitor C16 (capacitance value 2.7pF), a capacitor C17 (capacitance value 100pF), and an antenna L4 (frequency 433 MHz);

one end of the inductor L3 is electrically connected to one end of the capacitor C11 and one end of the inductor L5 respectively and is connected to an RF _ P pin of a chip U1, the other end of the inductor L5 is electrically connected to one end of the capacitor C15 and one end of the inductor L8 respectively and is connected to an RF _ N pin of the chip U1, and the other end of the inductor L8 is electrically connected to one end of the capacitor C17 and is connected to an RF _ TX pin of the chip U1 respectively; when the RF _ TX pin is at a high level, the RF _ P pin and the RF _ N pin send data to the outside, and when the RF _ TX pin is at a low level, the RF _ P pin and the RF _ N pin receive the data sent from the outside;

the other end of the capacitor C17 is grounded, the other end of the capacitor C15 is electrically connected with one end of the capacitor C16, the other end of the inductor L3 and one end of the inductor L6, the other end of the inductor L6 is electrically connected with one end of the capacitor C13 and one end of the inductor L7, the other end of the capacitor C13 is grounded, the other end of the inductor L7 is electrically connected with one end of the capacitor C14 and one end of the resistor R2, the other end of the capacitor C14 is grounded, and the other end of the resistor R2 is electrically connected with the antenna L4.

In summary, the utility model provides a miniature temperature measurement sensor, which provides a working power supply for the control circuit by arranging the power supply circuit; the antenna circuit is electrically connected with the control circuit to realize data sending and receiving, the control circuit can transmit the received temperature data to the temperature measuring circuit, and when the system needs to detect the temperature, the temperature measuring circuit can convert the detected voltage into a temperature value and store the temperature value in a chip of the control circuit, thereby realizing the online monitoring of the temperature of the joint part; the miniature temperature sensor of this scheme design's circuit structure is simple, can reduce the space of PCB cloth board greatly when PCB encapsulation, is favorable to realizing temperature sensor's miniaturization.

The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.

Claims (4)

1. A miniature temperature measurement sensor is characterized by comprising a power taking circuit, a control circuit, a temperature measurement circuit and an antenna circuit, wherein the control circuit is respectively and electrically connected with the power taking circuit, the temperature measurement circuit and the antenna circuit;

the temperature measuring circuit comprises a resistor R3, a resistor R4 and a capacitor C12, one end of the resistor R3 is electrically connected with one end of the capacitor C12, the other end of the capacitor C12 is grounded, the other end of the resistor R3 is electrically connected with one end of the resistor R4, and the other end of the resistor R4 is grounded.

2. The miniature temperature measurement sensor according to claim 1, wherein the electricity taking circuit comprises an inductor L2, a capacitor C10, an electrolytic capacitor CE1, an electrolytic capacitor CE2, a diode D1, a zener diode ZD1 and a chip U2;

the chip U2 comprises a first pin, a second pin, a third pin and a fourth pin, the first pin of the chip U2 is electrically connected with the third pin of the chip U2, one end of a capacitor C10, the cathode of a diode D1, one end of a zener diode ZD1 and one end of an inductor L2 respectively, the other end of the inductor L2 is electrically connected with the other end of the zener diode ZD1, the other end of the inductor L2 and the other end of the zener diode ZD1 are both grounded, the other end of the capacitor C10 is electrically connected with the second pin of the chip U2, one end of the electrolytic capacitor CE1 and one end of the electrolytic capacitor CE2 respectively, the other end of the capacitor C10, the second pin of the chip U2, one end of the electrolytic capacitor CE1 and one end of the electrolytic capacitor CE2 are all grounded, the other end of the electrolytic capacitor CE1 is electrically connected with the fourth pin of the chip U2 and the other end of the electrolytic capacitor CE2 respectively.

3. The miniature thermometric sensor of claim 1, wherein the antenna circuit comprises a resistor R2, an inductor L3, an inductor L5, an inductor L6, an inductor L7, an inductor L8, a capacitor C11, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, and an antenna L4;

one end of the inductor L3 is electrically connected to one end of the capacitor C11 and one end of the inductor L5, the other end of the inductor L5 is electrically connected to one end of the capacitor C15 and one end of the inductor L8, the other end of the inductor L8 is electrically connected to one end of the capacitor C17, the other end of the capacitor C17 is grounded, the other end of the capacitor C15 is electrically connected to one end of the capacitor C16, the other end of the inductor L3 and one end of the inductor L6, the other end of the inductor L6 is electrically connected to one end of the capacitor C13 and one end of the inductor L7, the other end of the capacitor C13 is grounded, the other end of the inductor L7 is electrically connected to one end of the capacitor C14 and one end of the resistor R2, the other end of the capacitor C14 is grounded, and the other end of the resistor R2 is electrically connected to the antenna L4.

4. The miniature temperature sensor according to claim 1, wherein the control circuit comprises a chip U1, a resistor R1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, an X capacitor CX1, a Y capacitor CY1 and an inductor L1;

the chip U17 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin, a ninth pin, a tenth pin, an eleventh pin, a twelfth pin, a thirteenth pin and a fourteenth pin, the first pin of the chip U1, the fourth pin of the chip U1, the seventh pin of the chip U1, the tenth pin of the chip U1 and the twelfth pin of the chip U1 are all grounded, the second pin of the chip U1 is respectively and electrically connected with one end of the capacitor C8 and one end of an X capacitor CX1, the other end of the capacitor C8 is grounded, the other end of the X capacitor CX1 is electrically connected with one end of the capacitor C9, the other end of the capacitor C9 is grounded, the fifth pin of the chip U1 is respectively and electrically connected with one end of the capacitor C3, one end of the capacitor C4, one end of the capacitor C5 and one end of the capacitor C6, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5 and the other end of the capacitor C6 are all grounded, a sixth pin of the chip U1 is electrically connected with one end of the capacitor C7, the other end of the capacitor C7 is grounded, an eighth pin of the chip U1 is electrically connected with one end of the capacitor C2 through the inductor L1, the other end of the capacitor C2 is grounded, an eleventh pin of the chip U1 is electrically connected with one end of the resistor R1 and one end of the capacitor C1 respectively, the other end of the capacitor C1 is grounded, a thirteenth pin of the chip U1 is electrically connected with a fourteenth pin of the chip U1 through the Y capacitor CY1, and the Y capacitor CY1 is grounded.

Images