Wireless temperature measurement system applied to power supply cabinet in strong electromagnetic environment

Abstract

The utility model discloses a wireless temperature measurement system applied to a power supply cabinet in a strong electromagnetic environment in the technical field of temperature measurement, comprising a temperature detection circuit comprising a crystal oscillator which generates stable frequency signals and is used for collecting accurate temperature signals; the input end of the processing chip is connected with the temperature detection circuit; the signal modulation and amplification circuit comprises a radio frequency chip, and an input pin of the radio frequency chip is connected to the output end of the processing chip; the input end of the wireless transmitting circuit is connected with the output pin of the radio frequency chip; and the filter circuit is connected with the output end of the processing chip. The beneficial effects of the utility model are that the accuracy of temperature signal acquisition is ensured through the temperature detection circuit, and the temperature signal is converted into a transmission signal consistent with a preset format through the signal modulation amplification circuit and then is sent to the wireless emission circuit, so that the signal is prevented from being subjected to strong electromagnetic interference; and the stability of wireless signal transmission is ensured.

Description

Technical Field

[0001] This utility model relates to the field of temperature measurement technology, and in particular to a wireless temperature measurement system for power supply cabinets in strong electromagnetic environments. Background Technology

[0002] The excitation system is a crucial component of a synchronous generator, responsible for automatically controlling the generator terminal voltage and reactive power. It directly impacts the generator's operating characteristics and significantly influences the safe operation of the power system. The rectifier cabinet in the excitation system converts the AC output from the excitation transformer anode into DC. It is the component that generates the most heat in the excitation system. Conventional rectifier cabinets use fans for cooling to ensure heat dissipation from the thyristors, and the fan operation (air pressure or speed) and the temperature of the air outlet from the rectifier cabinet are monitored to ensure the cabinet operates within a normal temperature range. As generator capacity increases, the anode voltage and output current of the power rectifier bridge in the excitation system also gradually increase. To ensure stable operation of the excitation system and reduce maintenance workload, it is essential to measure the temperature of each thyristor in the rectifier bridge.

[0003] In the excitation system of large generator sets, the high voltage and large current cause frequent commutation of the thyristor, generating extremely strong electromagnetic interference signals. Simultaneously, the thyristor is pressed between two heat sinks in a confined space, making temperature monitoring of the thyristor very difficult. In thyristor heat dissipation measurements, the temperature at the contact surface between the thyristor and the heat sink is the highest and closest to the temperature of the thyristor's internal PN junction. Therefore, the best measurement point is on the heat sink near the contact surface, but this requires a small temperature sensing element and wireless communication for safety. Utility Model Content

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of this section, the abstract and the title of this utility model. Such simplifications or omissions shall not be used to limit the scope of this utility model.

[0005] In view of the technical problems existing in the prior art, this utility model is proposed.

[0006] The purpose of this invention is to provide a wireless temperature measurement system for power supply cabinets in strong electromagnetic environments. The aim is to solve the problem that the temperature measurement device of the power supply cabinet is subject to strong electromagnetic interference in strong electromagnetic environments, resulting in unstable measurement system and low accuracy of temperature measurement results.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a temperature detection circuit, including a crystal oscillator, wherein the crystal oscillator generates a stable frequency signal for acquiring an accurate temperature signal;

[0008] A processing chip, the input terminal of which is connected to the temperature detection circuit;

[0009] A signal modulation and amplification circuit includes an radio frequency (RF) chip, wherein the input pin of the RF chip is connected to the output terminal of the processing chip;

[0010] A wireless transmitting circuit, wherein the input terminal of the wireless transmitting circuit is connected to the output pin of the radio frequency chip;

[0011] A filtering circuit is provided, which is connected to the output terminal of the processing chip.

[0012] As a preferred embodiment of the wireless temperature measurement system for power supply cabinets in strong electromagnetic environments described in this utility model, the temperature detection circuit includes a crystal oscillator, capacitor C1, capacitor C2 and resistor R1, with the two ends of resistor R1 connected to the processing chip.

[0013] As a preferred embodiment of the wireless temperature measurement system for power supply cabinets in strong electromagnetic environments described in this utility model, the crystal oscillator includes a first pin, a second pin, a third pin, and a fourth pin. One end of capacitor C1 is connected to the first pin, and the other end of capacitor C1 is connected to the fourth pin. One end of capacitor C2 is connected to the third pin, and the other end of capacitor C2 is connected to the third pin. One end of resistor R1 is connected to the first pin, and the other end of resistor R1 is connected to the third pin.

[0014] As a preferred embodiment of the wireless temperature measurement system for power supply cabinets in strong electromagnetic environments described in this utility model, the processing chip includes several input interfaces and several output interfaces. Two of the input interfaces are respectively connected to the two ends of the resistor R1, three of the output interfaces are connected to the signal modulation and amplification circuit, and two of the output interfaces are connected to the power supply.

[0015] As a preferred embodiment of the wireless temperature measurement system for power supply cabinets in strong electromagnetic environments described in this utility model, the signal modulation and amplification circuit includes an RF chip, capacitor C3, resistor R2, resistor R3, capacitor C11, and capacitor C7.

[0016] As a preferred embodiment of the wireless temperature measurement system for power supply cabinets in strong electromagnetic environments described in this utility model, wherein: pins a and c of the radio frequency chip are connected to the processing chip, and pin b of the radio frequency chip is grounded;

[0017] The d pin of the RF chip is connected to one end of the resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is grounded.

[0018] The f pin of the radio frequency chip is connected to one end of the resistor R3, the other end of the resistor R3 is connected to one end of the capacitor C11, and the other end of the capacitor C11 is grounded.

[0019] The e pin of the radio frequency chip is connected to one end of the capacitor C7, and the other end of the capacitor C7 is connected to the wireless transmission circuit.

[0020] As a preferred embodiment of the wireless temperature measurement system for power supply cabinets in strong electromagnetic environments described in this utility model, the signal modulation and amplification circuit adopts amplitude modulation, and the modulation target frequency of the signal modulation and amplification circuit is 433MHz.

[0021] As a preferred embodiment of the wireless temperature measurement system for power supply cabinets in strong electromagnetic environments described in this utility model, the wireless transmitting circuit includes inductor L5, capacitor C8, inductor L6, capacitor C5, inductor L7 and antenna.

[0022] One end of the inductor L5 is connected to the capacitor C7. The inductors L5, L6, L7 and the antenna are connected in sequence. One end of the capacitor C8 is connected to the junction of the inductors L5 and L6, and the other end of the capacitor C8 is grounded. One end of the capacitor C5 is connected to the junction of the inductors L6 and L7, and the other end of the capacitor C5 is grounded.

[0023] As a preferred embodiment of the wireless temperature measurement system for power supply cabinets in strong electromagnetic environments described in this utility model, the filter circuit includes inductor L2, capacitor C9, inductor L3, capacitor C6, capacitor C4, capacitor C12, inductor L4, capacitor C13, capacitor C10, inductor L8, capacitor C14, capacitor C15, and capacitor C16.

[0024] As a preferred embodiment of the wireless temperature measurement system for power supply cabinets in strong electromagnetic environments described in this utility model, the inductor L2 includes a first contact, a second contact, and a third contact. The first contact and the second contact are respectively connected to two different output interfaces of the processing chip, and the third contact is connected to one end of the capacitor C9, while the other end of the capacitor C9 is grounded.

[0025] One end of the inductor L3 is connected to the third contact, and the other end of the inductor L3 is connected to one end of the capacitor C6. The other end of the capacitor C6 is connected to the a pin.

[0026] One end of capacitor C4 is connected to the second contact, and the other end of capacitor C4 is connected to the junction of capacitor C6 and inductor L3;

[0027] One end of capacitor C12 is connected to another output interface of the processing chip, the other end of capacitor C12 is connected to inductor L4, the other end of inductor L4 is connected to capacitor C13, and the other end of capacitor C13 is grounded.

[0028] One end of capacitor C10 is connected to the junction of inductor L4 and capacitor C3, and the other end of capacitor C10 is connected to pin c.

[0029] One end of the inductor L8 is connected to the junction of the processing chip and the capacitor C12. The capacitors C14, C15 and C16 are connected in parallel and one end of each is connected to the inductor L8. The other ends of the capacitors C14, C15 and C16 are all grounded.

[0030] The beneficial effects of this utility model are as follows: by collecting the temperature signal of each thyristor in the power supply cabinet through the temperature detection circuit, the accuracy of temperature signal acquisition is ensured, and the temperature signal is converted into a transmission signal with the same preset format by the signal modulation and amplification circuit and then sent to the wireless transmission circuit, avoiding strong electromagnetic interference to the signal and ensuring the stability of wireless signal transmission. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0032] Figure 1 A flowchart illustrating a wireless temperature measurement system for a power supply cabinet in a strong electromagnetic environment, as provided in one embodiment of this utility model.

[0033] Figure 2 This is a schematic diagram of the circuit structure of a wireless temperature measurement system for a power supply cabinet in a strong electromagnetic environment, as described in one embodiment of this utility model. Detailed Implementation

[0034] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0037] Example 1

[0038] Reference Figure 1 This embodiment provides a wireless temperature measurement system for power supply cabinets in strong electromagnetic environments, including a temperature detection circuit 100, a processing chip 200, a signal modulation and amplification circuit 300, a wireless transmission circuit 400, and a filtering circuit 500.

[0039] Temperature detection circuit 100 is used to collect the temperature signal of each thyristor in the power supply cabinet;

[0040] The processing chip 200 is used to control the transmission of temperature signals, and to control the modulation and amplification circuit 300 and the wireless transmission circuit 400 to adjust their corresponding modulation parameters.

[0041] The signal modulation and amplification circuit 300 is used to receive the temperature signal and convert the temperature signal into a transmission signal that is consistent with the preset format.

[0042] The wireless transmitting circuit 400 is used to convert the transmission signal into a wireless signal according to a preset operating frequency and a preset transmission power, and transmit the wireless signal to the signal receiving end;

[0043] The filter circuit 500 is used to filter out interference signals in the temperature signal to obtain the target temperature signal, and then transmits the target temperature signal to the signal modulation and amplification circuit 300.

[0044] Specifically, the temperature detection circuit 100 collects the temperature signal of each thyristor in the power supply cabinet, ensuring the accuracy of the temperature signal acquisition. Furthermore, the temperature signal is converted into a transmission signal with the same preset format by the signal modulation and amplification circuit 300 and then sent to the wireless transmission circuit 400, avoiding strong electromagnetic interference and ensuring the stability of wireless signal transmission.

[0045] Example 2

[0046] Reference Figure 2This is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but differs in that the crystal oscillator 101 generates a stable frequency signal through its internal crystal resonator, thereby achieving stable and accurate temperature signal acquisition. Capacitors C1 and C2 are connected to the pins of the crystal oscillator 101, forming a resonant circuit to help stabilize the frequency of the crystal oscillator 101. Resistor R1 plays a role in regulating current and voltage in the circuit. This ensures that the crystal oscillator operates under appropriate conditions and improves the stability of the entire circuit. The two ends of resistor R1 are connected to the processing chip 200, transmitting the signal output by the crystal oscillator 101 to the processing chip 200 for subsequent temperature signal processing or control.

[0047] Specifically, the processing chip 200 uses an MCU chip with the model number CMT2380F32.

[0048] Preferably, the RF chip 301 is used to process RF signals, including signal modulation and amplification. Resistor R2 and capacitor C3 are used to filter and stabilize the signal at pin d, and resistor R3 and capacitor C11 are used to filter and stabilize the signal at pin f. The processed RF signal is output from pin e of the RF chip 301. Capacitor C7 is connected between pin e and the wireless transmitting circuit 400 to couple the RF signal. It allows the signal to pass through while blocking DC components or low-frequency signals, ensuring that the wireless transmitting circuit 400 receives a suitable RF signal. Pin b of the RF chip 301 is used for grounding to ensure circuit stability and normal signal operation.

[0049] Furthermore, the function of inductor L5 is to transfer the RF signal from the signal modulation amplifier circuit 300 to capacitor C8, typically acting as part of a filter to block unwanted frequency components and ensure signal transmission quality. Capacitor C8, in conjunction with inductor L5, forms a low-pass or high-pass filter to stabilize and remove unwanted signals from the RF signal. The other end of capacitor C8 is grounded, further aiding in filtering out unwanted signal components. Inductor L6 is connected between capacitors C8 and C5. Inductor L6, along with capacitors C8 and C5, forms a filter network that further stabilizes and filters the signal. This helps adjust the frequency and quality of the signal transmitted to antenna 401.

[0050] The function of capacitor C5 is to further filter and stabilize the signal. The other end of capacitor C5 is grounded to remove any remaining unwanted frequency components. Inductor L7 is connected between capacitor C5 and the antenna. It is used to transmit the filtered and stabilized RF signal to the antenna. The function of inductor L7 is to adjust the signal transmission and ensure that the signal can be effectively coupled to antenna 401. Antenna 401 is responsible for converting the RF signal into electromagnetic waves for wireless transmission. The performance of antenna 401 directly affects the signal transmission distance and quality.

[0051] Example 3

[0052] Reference Figure 2 This is the third embodiment of the present invention. This embodiment provides a pipe bending machine. This embodiment is based on the previous embodiment, but differs from the previous embodiment in that: inductor L2 receives signals from the processing chip through the first contact 501 and the second contact 502, respectively, and adjusts the frequency characteristics of these signals; inductor L2 and capacitor C9 form a filter network to remove high-frequency noise from the logic control circuit. Inductor L3 and capacitor C6 constitute a filter to further stabilize the signal and reduce noise. The configuration of capacitor C4 can further adjust and filter the signal. Capacitor C12 and inductor L4 form another filter to remove interference in the processing chip signal, while the setting of capacitor C10 can further adjust and stabilize the signal. Capacitors C14, C15, and C16 work together to remove remaining noise and interference. The parallel configuration of these capacitors increases the total capacitance value of the filter, improves the filtering effect, and stabilizes the signal.

[0053] Specifically, the filter circuit 500 filters and stabilizes the signal through a precisely configured network of inductors and capacitors. The inductors are used to adjust the frequency characteristics of the signal, while the capacitors are used to remove unwanted frequency components and noise. The circuit design is complex yet effective, which helps to optimize signal quality and ensure the stability and reliability of the circuit.

[0054] Preferably, the filter circuit 500 adopts the standard LC filtering method, which reduces the interference of multiple harmonics in the three-phase fully controlled bridge on the sampling circuit.

[0055] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0056] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to the implementation of the present invention) may be omitted.

[0057] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A wireless temperature measurement system for power supply cabinets in strong electromagnetic environments, characterized in that: include, The temperature detection circuit (100) includes a crystal oscillator (101) that generates a stable frequency signal for acquiring an accurate temperature signal; A processing chip (200) is provided, the input terminal of which is connected to the temperature detection circuit (100); The signal modulation and amplification circuit (300) includes an RF chip (301), the input pin of which is connected to the output terminal of the processing chip (200); A wireless transmitting circuit (400) is provided, wherein the input terminal of the wireless transmitting circuit (400) is connected to the output pin of the radio frequency chip (301); A filter circuit (500) is connected to the output terminal of the processing chip (200).

2. The wireless temperature measurement system for power supply cabinets in strong electromagnetic environments according to claim 1, characterized in that: The temperature detection circuit (100) includes a crystal oscillator (101), capacitors C1 and C2, and a resistor R1, with the two ends of the resistor R1 connected to the processing chip (200).

3. The wireless temperature measurement system for power supply cabinets in strong electromagnetic environments according to claim 2, characterized in that: The crystal oscillator (101) includes a first pin, a second pin, a third pin, and a fourth pin. One end of the capacitor C1 is connected to the first pin, and the other end of the capacitor C1 is connected to the fourth pin. One end of the capacitor C2 is connected to the third pin, and the other end of the capacitor C2 is connected to the third pin. One end of the resistor R1 is connected to the first pin, and the other end of the resistor R1 is connected to the third pin.

4. The wireless temperature measurement system for power supply cabinets in strong electromagnetic environments according to claim 3, characterized in that: The processing chip (200) includes several input interfaces and several output interfaces. Two of the input interfaces are respectively connected to the two ends of the resistor R1, and three of the output interfaces are connected to the signal modulation and amplification circuit (300). Two of the output interfaces are connected to the power supply.

5. The wireless temperature measurement system for power supply cabinets in strong electromagnetic environments according to claim 4, characterized in that: The signal modulation and amplification circuit (300) includes an RF chip (301), a capacitor C3, a resistor R2, a resistor R3, a capacitor C11, and a capacitor C7.

6. The wireless temperature measurement system for power supply cabinets in strong electromagnetic environments according to claim 5, characterized in that: The a and c pins of the radio frequency chip (301) are connected to the processing chip (200), and the b pin of the radio frequency chip (301) is grounded; The d pin of the radio frequency chip (301) is connected to one end of the resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is grounded. The f pin of the radio frequency chip (301) is connected to one end of the resistor R3, the other end of the resistor R3 is connected to one end of the capacitor C11, and the other end of the capacitor C11 is grounded. The e pin of the radio frequency chip (301) is connected to one end of the capacitor C7, and the other end of the capacitor C7 is connected to the wireless transmission circuit (400).

7. The wireless temperature measurement system for power supply cabinets in strong electromagnetic environments according to claim 6, characterized in that: The signal modulation amplifier circuit (300) adopts amplitude modulation, and the modulation target frequency of the signal modulation amplifier circuit (300) is 433MHz.

8. The wireless temperature measurement system for power supply cabinets in strong electromagnetic environments according to claim 7, characterized in that: The wireless transmitting circuit (400) includes an inductor L5, a capacitor C8, an inductor L6, a capacitor C5, an inductor L7, and an antenna (401). One end of the inductor L5 is connected to the capacitor C7. The inductors L5, L6, L7 and the antenna (401) are connected in sequence. One end of the capacitor C8 is connected to the junction of the inductors L5 and L6, and the other end of the capacitor C8 is grounded. One end of the capacitor C5 is connected to the junction of the inductors L6 and L7, and the other end of the capacitor C5 is grounded.

9. The wireless temperature measurement system for power supply cabinets in strong electromagnetic environments according to claim 1, characterized in that: The filter circuit (500) includes inductor L2, capacitor C9, inductor L3, capacitor C6, capacitor C4, capacitor C12, inductor L4, capacitor C13, capacitor C10, inductor L8, capacitor C14, capacitor C15 and capacitor C16.

10. The wireless temperature measurement system for power supply cabinets in strong electromagnetic environments according to claim 9, characterized in that: The inductor L2 includes a first contact (501), a second contact (502), and a third contact (503). The first contact (501) and the second contact (502) are respectively connected to two different output interfaces of the processing chip (200). The third contact (503) is connected to one end of the capacitor C9, and the other end of the capacitor C9 is grounded. One end of the inductor L3 is connected to the third contact (503), and the other end of the inductor L3 is connected to one end of the capacitor C6. The other end of the capacitor C6 is connected to the a pin. One end of the capacitor C4 is connected to the second contact (502), and the other end of the capacitor C4 is connected to the junction of the capacitor C6 and the inductor L3; One end of the capacitor C12 is connected to another output interface of the processing chip (200), the other end of the capacitor C12 is connected to the inductor L4, the other end of the inductor L4 is connected to the capacitor C13, and the other end of the capacitor C13 is grounded. One end of capacitor C10 is connected to the junction of inductor L4 and capacitor C3, and the other end of capacitor C10 is connected to pin c. One end of the inductor L8 is connected to the junction of the processing chip (200) and the capacitor C12. The capacitors C14, C15 and C16 are connected in parallel and one end of each is connected to the inductor L8. The other ends of the capacitors C14, C15 and C16 are all grounded.

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