An on-line temperature detection device

Abstract

This invention discloses an online temperature detection device. N*M NTC thermistors are installed at N heights above the ground in the silo, and at different locations on the cross-section of each height. The control module controls the on / off state of the first controllable switch module in each group of temperature measuring devices, thereby controlling the connection of the M NTC thermistors in the N groups of temperature measuring devices to detect the temperature at each location of the NTC thermistor in the silo. By controlling the on / off state of the second and third controllable switch modules in each group of temperature measuring devices, the device controls the connection of the NTC thermistor whose temperature was previously acquired by the first voltage acquisition module, thereby monitoring whether the temperature detection results are abnormal. This device, without affecting its own temperature detection function, establishes a tracking and monitoring mechanism to monitor whether any abnormalities occur in the N*M NTC thermistors in real time. Compared with manual detection, this method is more efficient and saves manpower.

Description

Technical Field

[0001] This invention relates to the field of detection, and in particular to an online temperature detection device. Background Technology

[0002] Large-scale farming consumes a significant amount of grain, necessitating the pre-storage of large quantities in silos to ensure supply. A silo is a cylindrical structure with a specific height and diameter. To ensure the grain within the silo is safely stored and does not spoil, it is necessary to monitor and analyze the temperature, promptly identify problems, and adjust environmental parameters.

[0003] Therefore, existing technologies typically involve installing temperature measuring devices with multiple temperature sensors at different heights and locations at the same height within the silo to monitor the temperature at multiple points within the silo. These temperature sensors are usually NTC thermistors (negative temperature coefficient thermistors). To prevent malfunctions in the temperature sensors from causing abnormal readings at the measurement points, developers need to periodically perform manual inspections on each temperature sensor. The inspection process usually involves using a multimeter to measure the resistance of each temperature sensor and comparing it to a "resistance-temperature" table for normal operation to obtain the current temperature. This temperature is then compared to the measured temperature value. If the difference exceeds an acceptable range, the temperature sensor is considered damaged and needs replacement, or the detection circuit containing the sensor is malfunctioning and requires troubleshooting.

[0004] However, the manual periodic testing method described above is too inefficient and wastes manpower. Since testing is only performed at intervals, the temperature sensor may have been damaged for some time before testing, resulting in a lag in the testing. Furthermore, manual testing requires shutting down the device, which means turning off the main power supply to the temperature measuring device, causing a disruption in normal temperature monitoring, which is very inconvenient. Summary of the Invention

[0005] The purpose of this invention is to provide an online temperature detection device that, without affecting the temperature detection function of the device itself, establishes a tracking and monitoring mechanism to monitor in real time whether N*M NTC thermistors are abnormal, so as to facilitate subsequent processing. This method is more efficient than manual detection and saves manpower.

[0006] To solve the above-mentioned technical problems, the present invention provides an online temperature detection device, including a control module and N sets of temperature measuring sub-devices; the N sets of temperature measuring sub-devices are respectively set at N heights above the ground of the silo, where N is an integer not less than 1;

[0007] Each set of temperature measuring sub-devices includes a first resistor, a first controllable switch module, M NTC thermistors, a first voltage acquisition module, a second resistor, a second voltage acquisition module, a second controllable switch module, and a third controllable switch module, wherein the M NTC thermistors are respectively disposed at different positions of the cross section at the height, and M is an integer not less than 1;

[0008] The first resistor is connected to the power supply and the first controllable switch module respectively. The first controllable switch module is also connected to the first terminals of the M NTC thermistors and the third controllable switch module. The second terminals of the M NTC thermistors are connected to the second voltage acquisition module and the common terminal of the connection is grounded. The second resistor is connected to the power supply and the second controllable switch module respectively. The second controllable switch module is also connected to the third controllable switch module and the second voltage acquisition module.

[0009] The control module is used to control the connection of M NTC thermistors in N groups of temperature measuring sub-devices by controlling the on and off states of the first controllable switch module in each group of temperature measuring sub-devices, and to receive the first voltage across the NTC thermistor currently connected by the first voltage acquisition module; to control the connection of the NTC thermistor previously acquired by the first voltage acquisition module by controlling the on and off states of the second and third controllable switch modules in each group of temperature measuring sub-devices, and to receive the second voltage across the NTC thermistor after its connection by the first voltage acquisition module; and to determine whether the NTC thermistor corresponding to the i-th first voltage is faulty based on the i-th first voltage and the second voltage corresponding to the i-th first voltage, where 1≤i≤N*M.

[0010] Preferably, the first controllable switch module in each group of temperature measuring sub-devices includes a Q-select multiplexer, wherein Q = M + 1 and the Q-select multiplexer includes one input and Q outputs, with the Qth output terminal left floating.

[0011] The input terminals of the Q-select multiplexer are connected to the first resistor and the first voltage acquisition module, respectively. The control terminal of the Q-select multiplexer is connected to the control module. The Q-1 output terminals of the Q-select multiplexer are connected to the first terminals of the M NTC thermistors one by one.

[0012] By controlling the on / off state of the first controllable switch module in each group of temperature measuring sub-devices, the M NTC thermistors in the N groups of temperature measuring sub-devices are respectively connected, including:

[0013] When the temperature measuring sub-device of the s-th group is selected, the input terminal of the Q-select multiplexer is connected to the first output terminal to the Q-1 output terminal of the Q-select multiplexer to connect the M NTC thermistors of the temperature measuring sub-device of the s-th group respectively, where 1≤s≤N and s is an integer;

[0014] When the temperature measuring sub-device in the s-th group is not selected, the input terminal of the Q-select multiplexer is connected to the Q-th output terminal of the Q-select multiplexer so that all M NTC thermistors in the temperature measuring sub-device in the s-th group are disconnected from the branch where the Q-select multiplexer is located.

[0015] Preferably, the first controllable switch module in each group of temperature measuring sub-devices includes a first two-to-one multiplexer and a first M-to-one multiplexer, wherein the first two-to-one multiplexer includes one input and two outputs, and the second output terminal is left floating.

[0016] The input terminals of the first two-to-one multiplexer are connected to the first resistor and the first voltage acquisition module, respectively. The control terminal of the first two-to-one multiplexer is connected to the control module. The first output terminal of the first two-to-one multiplexer is connected to the input terminal of the first M-to-one multiplexer.

[0017] The M output terminals of the first M-to-1 multiplexer are respectively connected to the first terminals of the M NTC thermistors, and the control terminal of the first M-to-1 multiplexer is connected to the control module.

[0018] By controlling the on / off state of the first controllable switch module in each group of temperature measuring sub-devices, the M NTC thermistors in the N groups of temperature measuring sub-devices are respectively connected, including:

[0019] When the temperature measuring sub-device of the z-th group is selected, the input terminal of the first two-to-one multiplexer is connected to the first output terminal of the first two-to-one multiplexer, and the input terminal of the first M-to-one multiplexer is connected to the first output terminal to the M-th output terminal of the first M-to-one multiplexer, so as to connect the M NTC thermistors of the temperature measuring sub-device of the z-th group respectively, where 1≤z≤N and z is an integer;

[0020] When the temperature measuring sub-device of the z-th group is not selected, the input terminal of the first two-to-one multiplexer is connected to the second output terminal of the first two-to-one multiplexer, so that all M NTC thermistors of the temperature measuring sub-device of the z-th group are disconnected from the branch where the first two-to-one multiplexer and the first M-to-one multiplexer are located.

[0021] Preferably, each group of temperature measuring sub-devices further includes a first analog-to-digital converter and a second analog-to-digital converter;

[0022] The first analog-to-digital converter is connected to the first voltage acquisition module and the control module respectively, and is used to perform analog-to-digital conversion on the data acquired by the first voltage acquisition module and transmit the converted result to the control module.

[0023] The second analog-to-digital converter is connected to the second voltage acquisition module and the control module respectively, and is used to perform analog-to-digital conversion on the data acquired by the second voltage acquisition module and transmit the converted result to the control module.

[0024] Preferably, each set of temperature measuring sub-devices further includes a first voltage follower and a second voltage follower;

[0025] The first voltage follower is disposed between the first voltage acquisition module and the first analog-to-digital converter, and the input terminal of the first voltage follower is connected to the first voltage acquisition module, and the output terminal of the first voltage follower is connected to the first analog-to-digital converter, for buffering and isolating the data acquired by the first voltage acquisition module;

[0026] The second voltage follower is disposed between the second voltage acquisition module and the second analog-to-digital converter, and the input terminal of the second voltage follower is connected to the second voltage acquisition module, and the output terminal of the second voltage follower is connected to the second analog-to-digital converter, for buffering and isolating the data acquired by the second voltage acquisition module.

[0027] Preferably, when both the first power source and the second power source are AC mains power sources,

[0028] The online temperature detection device also includes a first voltage conversion module and a second voltage conversion module;

[0029] The input terminal of the first voltage conversion module is connected to the mains power supply, and the output terminal of the first voltage conversion module is connected to the first resistor in each group of temperature measuring sub-devices, for converting the input voltage of the mains power supply to power the online temperature detection device.

[0030] The input terminal of the second voltage conversion module is connected to the mains power supply, and the output terminal of the second voltage conversion module is connected to the second resistor in each group of temperature measuring sub-devices, for converting the input voltage of the mains power supply to power the online temperature detection device.

[0031] Preferably, the control module includes a first MCU, a second MCU, and a third MCU;

[0032] The first MCU is connected to the third MCU, the first voltage acquisition module and the first controllable switch module in each group of temperature measuring sub-devices, respectively. It is used to control the M NTC thermistors in the N groups of temperature measuring sub-devices to be connected by controlling the conduction and cutoff of the first controllable switch modules in each group of temperature measuring sub-devices. It also receives the first voltage across the NTC thermistor currently connected by the first voltage acquisition module and determines the first temperature of the first position of the NTC thermistor corresponding to the i-th first voltage according to the i-th first voltage and the preset voltage-resistance-temperature correspondence.

[0033] The second MCU is connected to the third MCU, the second voltage acquisition module, the second controllable switch module, and the third controllable switch module in each group of temperature measuring sub-devices, respectively. It is used to control the connection of the NTC thermistor acquired by the first voltage acquisition module in the previous operation by controlling the conduction and cutoff of the second controllable switch module and the third controllable switch module in each group of temperature measuring sub-devices. It also receives the second voltage at both ends of the NTC thermistor after it is connected by the first voltage acquisition module in the previous operation by the second voltage acquisition module. Based on the i-th second voltage and the preset voltage-resistance-temperature correspondence, it determines the second temperature of each of the first positions that corresponds one-to-one with the first temperature.

[0034] The third MCU is connected to the first MCU and the second MCU respectively, and is used to determine whether the NTC thermistor corresponding to the i-th first position is faulty based on the first temperature and the second temperature of the i-th first position.

[0035] Preferably, the second controllable switch module in each group of temperature measuring sub-devices includes a second two-to-one multiplexer and the third controllable switch module includes a second M-to-one multiplexer, wherein the second two-to-one multiplexer includes one input and two outputs, and the second output terminal is left floating;

[0036] The input terminal of the second 2-to-1 multiplexer is connected to the second resistor, the control terminal of the second 2-to-1 multiplexer is connected to the control module, and the first output terminal of the second 2-to-1 multiplexer is connected to the input terminal of the second M-to-1 multiplexer and the second voltage acquisition module, respectively.

[0037] The M output terminals of the second M-to-one multiplexer are respectively connected to the first terminals of the M NTC thermistors, and the control terminal of the second M-to-one multiplexer is connected to the control module.

[0038] By controlling the on / off state of the second and third controllable switch modules in each group of temperature measuring sub-devices, the connection of the NTC thermistor previously acquired by the first voltage acquisition module is controlled, including:

[0039] The system controls the connection between the input terminal and the first output terminal of the second two-to-one multiplexer in the group of temperature measuring devices corresponding to the NTC thermistor acquired by the first voltage acquisition module in the previous test, and controls the connection between the input terminal of the second M-to-one multiplexer in the group of temperature measuring devices and the output terminal of the second M-to-one multiplexer corresponding to the NTC thermistor acquired by the first voltage acquisition module in the previous test, so that the NTC thermistor acquired by the first voltage acquisition module in the previous test can be connected.

[0040] Preferably, before connecting the input terminal and the first output terminal of the second two-to-one multiplexer in the group of temperature measuring sub-devices corresponding to the NTC thermistor acquired by the first voltage acquisition module in the previous step, the method further includes:

[0041] Determine the second location of the currently connected NTC thermistor;

[0042] The NTC thermistor acquired by the first voltage acquisition module in the previous transaction is determined based on the second position and the preset NTC thermistor operating sequence.

[0043] Preferably, determining the second location of the currently connected NTC thermistor includes:

[0044] Control the connection between the input terminal and the second output terminal of the second two-to-one multiplexer in each group of temperature measuring sub-devices;

[0045] Starting with the temperature measuring sub-devices in group 1, the temperature measuring sub-devices in each group are selected in a round-robin fashion to determine the second position of the currently connected NTC thermistor. The round-robin selection step specifically includes:

[0046] For the temperature measuring sub-devices in the p-th group selected in this round, where 1≤p≤N and p is an integer, the following steps are performed:

[0047] The input terminal of the second M-to-1 multiplexer is connected to the first to the Mth output terminals of the second M-to-1 multiplexer, respectively.

[0048] Determine whether the third voltage acquired by the second voltage acquisition module is 0 when the input terminal of the second M-to-1 multiplexer is turned on and each output terminal is turned on respectively; if not, determine which NTC thermistor corresponds to which output terminal is the currently connected NTC thermistor, wherein the position of the NTC thermistor corresponding to which output terminal is the second position of the currently connected NTC thermistor.

[0049] This invention provides an online temperature detection device. This device incorporates N*M NTC thermistors at N different heights above the ground in the silo, and at different cross-sectional locations at each height. The control module controls the on / off state of the first controllable switch module in each group of temperature measuring devices, thereby controlling the connection of each of the M NTC thermistors in the N groups, enabling temperature detection at the location of each NTC thermistor within the silo. Furthermore, by controlling the on / off state of the second and third controllable switch modules in each group of temperature measuring devices, the device controls the connection of the NTC thermistors whose readings were previously collected by the first voltage acquisition module. This allows for temperature monitoring to detect any anomalies in the temperature readings without affecting the device's core temperature detection function. Therefore, this solution, without compromising the device's core temperature detection function, can monitor the N*M NTC thermistors in real time for any abnormalities, facilitating subsequent processing and ensuring the safety of grain storage. Compared to manual inspection, this method is more efficient and saves manpower. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the structure of an online temperature detection device provided by the present invention;

[0052] Figure 2 This is a schematic diagram of another online temperature detection device provided by the present invention;

[0053] Figure 3 This is a schematic diagram of another online temperature detection device provided by the present invention. Detailed Implementation

[0054] The core of this invention is to provide an online temperature detection device. Without affecting the temperature detection function of the online temperature detection device itself, it can monitor in real time whether N*M NTC thermistors are abnormal, so as to facilitate subsequent processing. Compared with manual detection, it is more efficient and saves manpower.

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an online temperature detection device provided by the present invention.

[0057] The online temperature detection device includes a control module 1 and N sets of temperature measuring sub-devices; the N sets of temperature measuring sub-devices are respectively set at N heights above the ground of the silo, where N is an integer not less than 1;

[0058] Each temperature measuring sub-device includes a first resistor 2, a first controllable switch module 3, M NTC thermistors 4, a first voltage acquisition module 5, a second resistor 6, a second voltage acquisition module 7, a second controllable switch module 8, and a third controllable switch module 9. The M NTC thermistors 4 are respectively set at different positions of the cross-section at the height, and M is an integer not less than 1.

[0059] The first resistor 2 is connected to the power supply and the first controllable switch module 3 respectively. The first controllable switch module 3 is also connected to the first end of M NTC thermistors 4 and the third controllable switch module 9. The second end of M NTC thermistors 4 is connected to the second voltage acquisition module 7 and the common terminal of the connection is grounded. The second resistor 6 is connected to the power supply and the second controllable switch module 8 respectively. The second controllable switch module 8 is also connected to the third controllable switch module 9 and the second voltage acquisition module 7.

[0060] The control module 1 is used to control the connection of M NTC thermistors 4 in N groups of temperature measuring sub-devices by controlling the on and off of the first controllable switch module 3 in each group of temperature measuring sub-devices, and to receive the first voltage across the NTC thermistor 4 currently connected by the first voltage acquisition module 5; by controlling the on and off of the second controllable switch module 8 and the third controllable switch module 9 in each group of temperature measuring sub-devices, to control the connection of the NTC thermistor 4 previously acquired by the first voltage acquisition module 5, and to receive the second voltage across the NTC thermistor 4 after its connection by the second voltage acquisition module 7; and to determine whether the NTC thermistor 4 corresponding to the i-th first voltage is faulty based on the i-th first voltage and the second voltage corresponding to the i-th first voltage, where 1≤i≤N*M.

[0061] In this embodiment, to achieve temperature detection at various points within the silo, a temperature measuring device comprising multiple temperature sensors is installed in the silo, and each temperature sensor is periodically inspected to prevent damage that could affect the temperature detection results. However, the inspection of each temperature sensor requires a complete power-off of the entire device during inspection, affecting its normal operation. Furthermore, the inspection process requires manual intervention, and the method itself suffers from latency. To address these technical problems, this application provides an online temperature detection device. Without affecting the device's inherent temperature detection function, a temperature tracking and monitoring mechanism is established to ensure the accuracy and real-time nature of the temperature detection results.

[0062] The online temperature detection device may include a control module 1 and N sets of temperature measuring sub-devices. The control module 1 includes, but is not limited to, an MCU (Microcontroller Unit). This application does not impose any particular limitation on it. The N sets of temperature measuring sub-devices are respectively set at N different heights above the ground in the silo. The specific number of sets can be determined according to actual needs.

[0063] Each temperature measuring sub-device may include a first resistor 2, a first controllable switch module 3, M NTC thermistors 4, a first voltage acquisition module 5, a second resistor 6, a second voltage acquisition module 7, a second controllable switch module 8, and a third controllable switch module 9. It should first be noted that... Figure 1 As shown, the Figure 1 The structural diagram is illustrated using only one set of temperature measuring devices as an example, and there are a total of M NTC thermistors 4 in this example. Figure 1For ease of explanation, only a portion of the NTC thermistors 4 are shown, with ellipses added for illustrative purposes. Due to space limitations in the images, the control module 1, which connects to the control terminals of the first controllable switch module 3, the second controllable switch module 8, and the third controllable switch module 9, is represented by circles and reference numerals. The first controllable switch module 3 can have M output terminals, each corresponding to one of the M NTC thermistors, and the third controllable switch module 9 can also have M output terminals, each corresponding to one of the M NTC thermistors. Due to space limitations in the images, the M output terminals of the first controllable switch module 3 and the M output terminals of the third controllable switch module 9 are represented by a single connecting wire.

[0064] One end of the first voltage acquisition module 5 is connected to the first resistor 2 and the first controllable switch module 3 respectively. The other end of the first voltage acquisition module 5 is connected to the second end of M NTC thermistors 4 and the common terminal of the connection is grounded. Of course, the M NTC thermistors 4 can be set at different positions of the cross section at the height. The specific positions of the cross section at the height can be determined according to actual needs. For example, they can be set on the outermost circumference of the cross section or arranged at equal intervals on the cross section. This application does not make any special limitation here.

[0065] It is understood that the first power supply, the first resistor 2, the first controllable switch module 3, and the M NTC thermistors 4 constitute the first branch for real-time temperature detection. The control module 1 controls the M NTC thermistors 4 in the N groups of temperature measuring sub-devices to be connected separately, for example, separately and sequentially. Here, "separately connected" means that for the M NTC thermistors 4 in each group of temperature measuring sub-devices, only one NTC thermistor 4 is connected to the first branch for real-time temperature detection at any given time. The first voltage acquisition module 5 can acquire the first voltage across the NTC thermistor 4 when it is connected to the circuit and transmit each first voltage to the control module 1. It should be noted that each first voltage transmitted to the control module 1 corresponds to the temperature value at the location of an NTC thermistor 4.

[0066] The second power supply, the second resistor 6, the second controllable switch module 8, the third controllable switch module 9, and M NTC thermistors 4 constitute the second branch for real-time temperature monitoring. The control module 1 controls the connection of the NTC thermistors 4 collected by the first voltage acquisition module 5 in the previous operation by controlling the conduction and cutoff of the second controllable switch module 8 and the third controllable switch module 9 in each group of temperature measuring sub-devices. The second voltage acquisition module 7 can acquire the second voltage across the NTC thermistors 4 after they are connected by the first voltage acquisition module 5 and transmit each second voltage to the control module 1. Thus, for each NTC thermistor 4, the first voltage for temperature detection and the second voltage for temperature monitoring at that location can be obtained respectively.

[0067] It should be noted that the reason for controlling the connection of the NTC thermistor 4 previously acquired by the first voltage acquisition module 5 is that the online temperature detection device provided in this application, without affecting its own temperature detection function, establishes a tracking and monitoring mechanism to monitor whether each NTC thermistor 4 is abnormal. The NTC thermistor 4 previously acquired by the first voltage acquisition module 5 is adjacent to the currently connected NTC thermistor 4 and is not the NTC thermistor 4 to be acquired by the next first voltage acquisition module 5. For example, if M=5, there are 5 NTC thermistors 4. Therefore, for the first branch, which is used for real-time temperature detection, the control module 1 will cyclically control the 1st NTC thermistor 4, the 2nd NTC thermistor 4, the 3rd NTC thermistor 4, the 4th NTC thermistor 4, and the 5th NTC thermistor 4 in the following order. The NTC thermistors 4 are connected to the first branch. Assuming the currently connected NTC thermistor 4 is the second NTC thermistor 4, the control module 1 will control the third NTC thermistor 4 to be connected to the circuit as the currently connected NTC thermistor 4. That is, for the first voltage acquisition module 5, the next time it needs to acquire is the first voltage across the third NTC thermistor 4 when it is connected to the circuit. Therefore, it can be understood that at the current moment, if the currently connected NTC thermistor 4 is the second NTC thermistor 4, and these five NTC thermistors 4 are connected to the first branch in a sequential order, then the NTC thermistor 4 acquired by the first voltage acquisition module 5 last time was the first NTC thermistor 4. The control module 1 will then control the first NTC thermistor 4 to be connected to the second branch to realize the temperature tracking and monitoring mechanism given in this application.

[0068] Therefore, after receiving each first voltage and second voltage, the control module 1 can determine whether the NTC thermistor 4 corresponding to the i-th first voltage is faulty based on the first voltage and the second voltage corresponding to the i-th first voltage.

[0069] Of course, the temperature detection results obtained at each location can be used as control factors for other devices such as relays. This application does not impose any special limitations on this, but it depends on the actual needs. The control module 1 can also be connected to a display module such as an LCD-12964 display screen to display the first and second temperatures at each location in the silo, which is convenient for subsequent human-machine interaction. This application does not impose any special limitations on this. The various temperature measuring sub-devices here can share a common ground when actually connected.

[0070] It is understood that the phrase "controlling the connection of the NTC thermistor 4 collected by the first voltage acquisition module 5 in the previous period by controlling the on and off of the second controllable switch module 8 and the third controllable switch module 9 in each group of temperature measuring sub-devices" in this application can also be extended to control the connection of the NTC thermistor 4 collected by the first voltage acquisition module 5 in the previous period by controlling the on and off of the second controllable switch module 8 and the third controllable switch module 9 in each group of temperature measuring sub-devices. This application does not make any special limitation here, as long as the control logic can realize the tracking and monitoring logic concept in this application.

[0071] Furthermore, by replacing the N*M NTC thermistors 4 here with corresponding resistors that can change with the humidity environment of the silo, real-time detection and monitoring of the humidity of the silo can be achieved. This application does not make any special limitation here. It is understood that the online temperature detection device proposed in this application is also applicable to other occasions that require temperature detection and monitoring, in addition to silos.

[0072] In summary, this application provides an online temperature detection device. This device sets up N*M NTC thermistors 4 at N heights above the ground of the silo and at different positions of the cross-section at each height. Without affecting the temperature detection function of the online temperature detection device itself, by establishing a temperature tracking and monitoring mechanism, it can monitor in real time whether any abnormalities occur in the N*M NTC thermistors 4, so as to facilitate subsequent processing, ensuring the safety of grain storage. Moreover, it is more efficient than manual detection and saves manpower.

[0073] Based on the above embodiments:

[0074] In a preferred embodiment, the first controllable switch module 3 in each group of temperature measuring sub-devices includes a Q-select multiplexer, wherein Q = M + 1 and the Q-select multiplexer includes one input and Q outputs, with the Qth output terminal left floating.

[0075] The input terminals of the Q-select multiplexer are connected to the first resistor 2 and the first voltage acquisition module 5 respectively. The control terminal of the Q-select multiplexer is connected to the control module 1. The Q-1 output terminals of the Q-select multiplexer are connected to the first terminals of M NTC thermistors 4 respectively.

[0076] By controlling the on / off state of the first controllable switch module 3 in each group of temperature measuring sub-devices, the M NTC thermistors 4 in the N groups of temperature measuring sub-devices are respectively connected, including:

[0077] When the temperature measuring device of group s is selected, the input terminal of the Q-select multiplexer is connected to the first output terminal to the Q-1 output terminal of the Q-select multiplexer to connect the M NTC thermistors 4 of the temperature measuring device of group s respectively, where 1≤s≤N and s is an integer;

[0078] When the temperature measuring device of group s is not selected, the input terminal of the Q-select multiplexer is connected to the Q-output terminal of the Q-select multiplexer so that all M NTC thermistors 4 in the temperature measuring device of group s are disconnected from the branch where the Q-select multiplexer is located.

[0079] In this embodiment, the first controllable switch module 3 in each temperature measuring sub-device may include a Q-selector multiplexer. When the input terminal of the Q-selector multiplexer is connected to its first output terminal, the first NTC thermistor 4 can be connected to the first branch for real-time temperature detection described in the above embodiment. When the input terminal of the Q-selector multiplexer is connected to its second output terminal, the second NTC thermistor 4 can be connected to the first branch, and so on.

[0080] Therefore, as explained in the above embodiments, the control module 1 controls the M NTC thermistors 4 in the N groups of temperature measuring sub-devices to be connected separately, for example, separately and sequentially, by turning on and off the first controllable switch module 3 in each group of temperature measuring sub-devices. Specifically, when the s-th group of temperature measuring sub-devices is selected, the control module 1 controls the input terminal of the Q-select multiplexer to be connected to the first output terminal of the Q-select multiplexer, and then to the (Q-1)-th output terminal, so that the M NTC thermistors 4 in the s-th group of temperature measuring sub-devices can be connected separately. When the s-th group of temperature measuring sub-devices is not selected, the control module 1 controls the input terminal of the Q-select multiplexer to be connected to the Q-th output terminal of the Q-select multiplexer. Since the Q-th output terminal of the Q-select multiplexer is left floating, all M NTC thermistors 4 in the s-th group of temperature measuring sub-devices can be disconnected from the branch where the Q-select multiplexer is located, that is, the first branch mentioned above, so that the current group of temperature measuring sub-devices does not perform temperature detection.

[0081] It is evident that this method can simply and reliably implement the execution logic of the first controllable switch module 3, thereby ensuring temperature detection at various locations within the silo.

[0082] In a preferred embodiment, the first controllable switch module 3 in each group of temperature measuring sub-devices includes a first two-to-one multiplexer and a first M-to-one multiplexer, wherein the first two-to-one multiplexer includes one input and two outputs, and the second output terminal is left floating.

[0083] The input terminals of the first two-to-one multiplexer are connected to the first resistor 2 and the first voltage acquisition module 5 respectively. The control terminal of the first two-to-one multiplexer is connected to the control module 1. The first output terminal of the first two-to-one multiplexer is connected to the input terminal of the first M-to-one multiplexer.

[0084] The M output terminals of the first M-to-one multiplexer are respectively connected to the first terminals of the M NTC thermistors 4, and the control terminal of the first M-to-one multiplexer is connected to the control module 1.

[0085] By controlling the on / off state of the first controllable switch module 3 in each group of temperature measuring sub-devices, the M NTC thermistors 4 in the N groups of temperature measuring sub-devices are respectively connected, including:

[0086] When the z-th group of temperature measuring devices is selected, the input terminal of the first two-to-one multiplexer is connected to the first output terminal of the first two-to-one multiplexer, and the input terminal of the first M-to-one multiplexer is connected to the first output terminal to the M-th output terminal of the first M-to-one multiplexer, so as to connect the M NTC thermistors 4 of the z-th group of temperature measuring devices respectively, where 1≤z≤N and z is an integer;

[0087] When the z-th group of temperature measuring devices is not selected, the input terminal of the first two-to-one multiplexer is connected to the second output terminal of the first two-to-one multiplexer, so that all M NTC thermistors 4 of the z-th group of temperature measuring devices are disconnected from the branch where the first two-to-one multiplexer and the first M-to-one multiplexer are located.

[0088] In this embodiment, the first controllable switch module 3 may further include a first two-to-one multiplexer and a first M-to-one multiplexer. When the input terminal of the first M-to-one multiplexer is connected to its first output terminal, the first NTC thermistor 4 can be connected to the first branch for real-time temperature detection described in the above embodiment. When the input terminal of the first M-to-one multiplexer is connected to its second output terminal, the second NTC thermistor 4 can be connected to the first branch, and so on.

[0089] Therefore, as explained in the above embodiments, the control module 1 controls the connection of M NTC thermistors 4 in the N groups of temperature measuring sub-devices by turning the first controllable switch module 3 on and off in each group of temperature measuring sub-devices. For example, the connection can be made separately and sequentially. Specifically, when the z-th group of temperature measuring sub-devices is selected, the control module 1 controls the connection between the input terminal of the first two-to-one multiplexer and the first output terminal of the first two-to-one multiplexer to provide a basis for the connection of each NTC thermistor 4 in the z-th group of temperature measuring sub-devices; by controlling the input terminal of the first M-to-one multiplexer to connect with the first M-to-one multiplexer... Starting from the first output terminal of the switch, the circuit is connected to the Mth output terminal, allowing the M NTC thermistors 4 of the z-th temperature measuring device to be connected respectively. When the z-th temperature measuring device is not selected, the input terminal of the first 2-to-1 multiplexer is connected to the second output terminal of the first 2-to-1 multiplexer. Since the second output terminal of the first 2-to-1 multiplexer is left floating, all M NTC thermistors 4 of the z-th temperature measuring device are disconnected from the branch where the first 2-to-1 multiplexer and the first M-to-1 multiplexer are located, i.e., the first branch mentioned above. In other words, the current temperature measuring device of this group does not perform temperature detection.

[0090] More specifically, to better suit practical applications and simplify control logic, we can implement parallel control of the first M-to-1 multiplexer in each group of temperature measuring sub-devices. For example, let's take N=8 and M=16 as an example. Please refer to [link / reference]. Figure 2 , Figure 2 This is a schematic diagram of another online temperature detection device provided by the present invention.

[0091] For any one of the first 16-to-1 multiplexers 31, only four control terminals are needed to connect to the four control lines from the control module 1, one input terminal to the first resistor 2, and 16 output terminals, each corresponding to one of the 16 NTC thermistors 4 in the temperature measuring sub-device containing that first 16-to-1 multiplexer 31. Assuming the four control terminals of each first 16-to-1 multiplexer 31 are O1, O2, O3, and O4, and the 16 output terminals correspond to channels 0, 1, 2, and so on up to channel 15, the control module 1 can use hexadecimal encoding to select which output terminal is currently active for each first 16-to-1 multiplexer 31. Please refer to Table 1 for details. Table 1 is a truth table for selecting the active channel of each first 16-to-1 multiplexer 31 provided by this invention. Indicates the enable terminal.

[0092] Table 1

[0093]

[0094]

[0095] Therefore, based on this, refer to Figure 2 It can be seen that the control module 1 will control each of the first 16-to-1 switches to switch from channel 0 to channel 15 in parallel and simultaneously. Taking the control module 1 sending "0001" to each of the first 16-to-1 multiplexers 31 as an example, the control information received by the control terminal of the first 16-to-1 multiplexer 31 in each group of temperature measuring sub-devices is the same. That is, in each group of temperature measuring sub-devices, the first NTC thermistor 4 is selected to achieve temperature measurement. It can be seen that the specific embodiment given above further simplifies the control logic of the first controllable switch module 3.

[0096] It is evident that this method can reliably implement the execution logic of the first controllable switch module 3, ensuring temperature detection at various locations within the silo, thus demonstrating high practicality.

[0097] In a preferred embodiment, each set of temperature measuring sub-devices further includes a first analog-to-digital converter and a second analog-to-digital converter;

[0098] The first analog-to-digital converter is connected to the first voltage acquisition module 5 and the control module 1 respectively, and is used to perform analog-to-digital conversion on the data acquired by the first voltage acquisition module 5 and transmit the converted result to the control module 1.

[0099] The second analog-to-digital converter is connected to the second voltage acquisition module 7 and the control module 1 respectively, and is used to perform analog-to-digital conversion on the data acquired by the second voltage acquisition module 7 and transmit the converted result to the control module 1.

[0100] In this embodiment, considering that the control module 1 can only process digital quantities, while the first voltage acquired by the first voltage acquisition module 5 and the second voltage acquired by the second voltage acquisition module 7 are both analog quantities, each temperature measuring sub-device may also include a first analog-to-digital converter and a second analog-to-digital converter. The first analog-to-digital converter is connected between the first voltage acquisition module 5 and the control module 1, and can perform analog-to-digital conversion on the data acquired by the first voltage acquisition module 5, i.e., the first voltage, and transmit the converted result, i.e., the converted first voltage, to the control module 1. Similarly, the second analog-to-digital converter is connected between the second voltage acquisition module 7 and the control module 1, and can perform analog-to-digital conversion on the data acquired by the second voltage acquisition module 7, i.e., the second voltage, and transmit the converted result, i.e., the converted second voltage, to the control module 1.

[0101] Of course, if the control module 1 itself has a built-in analog-to-digital conversion function, each group of temperature measuring sub-devices may not include the first analog-to-digital converter and the second analog-to-digital converter. This application does not make any special restrictions here.

[0102] More specifically, and closer to practical applications, in actual applications, the first analog-to-digital converter can be any one of the conversion channels of an A / D converter with N input channels, and the same applies to the second analog-to-digital converter. This application does not impose any special limitations here. The communication interface between the first and second analog-to-digital converters and the control module 1 includes, but is not limited to, an SPI communication interface.

[0103] As can be seen, this method can simply and reliably convert the analog quantity of the first voltage acquired by the first voltage acquisition module 5 into the digital quantity of the first voltage that the control module 1 can process, and convert the analog quantity of the second voltage acquired by the second voltage acquisition module 7 into the digital quantity of the second voltage that the control module 1 can process.

[0104] In a preferred embodiment, each set of temperature measuring devices further includes a first voltage follower and a second voltage follower;

[0105] The first voltage follower is disposed between the first voltage acquisition module 5 and the first analog-to-digital converter, with the input terminal of the first voltage follower connected to the first voltage acquisition module 5 and the output terminal of the first voltage follower connected to the first analog-to-digital converter, and is used to buffer and isolate the data acquired by the first voltage acquisition module 5;

[0106] The second voltage follower is positioned between the second voltage acquisition module 7 and the second analog-to-digital converter, with its input terminal connected to the second voltage acquisition module 7 and its output terminal connected to the second analog-to-digital converter. It is used to buffer and isolate the data acquired by the second voltage acquisition module 7.

[0107] In this embodiment, the inventors further considered that in order to achieve the conditioning of the first voltage acquired by the first voltage acquisition module 5 and the conditioning of the second voltage acquired by the second voltage acquisition module 7, each temperature measuring sub-device may also include a first voltage follower and a second voltage follower.

[0108] The first voltage follower buffers and isolates the data acquired by the first voltage acquisition module 5, i.e., the first voltage, i.e., analog signal conditioning, which can reduce the first impedance of the input to the subsequent first analog-to-digital converter; the second voltage follower buffers and isolates the data acquired by the second voltage acquisition module 7, i.e., the second voltage, i.e., analog signal conditioning, which can reduce the second impedance of the input to the subsequent second analog-to-digital converter.

[0109] More specifically, and closer to practical applications, in a practical application, taking an online temperature detection device with N=8 as an example, four two-channel voltage followers can be used. Thus, the first voltage follower can be one of the channels of the two-channel voltage follower mentioned above, and the second voltage follower can be adjusted according to the actual connection circuit. This application does not make any special limitations here.

[0110] As can be seen, this method can achieve data buffering and isolation, ensuring the reliable operation of the subsequent first analog-to-digital converter and second analog-to-digital converter.

[0111] In a preferred embodiment, when both the first power supply and the second power supply are AC mains power supplies, the online temperature detection device further includes a first voltage conversion module and a second voltage conversion module.

[0112] The input terminal of the first voltage conversion module is connected to the mains power supply, and the output terminal of the first voltage conversion module is connected to the first resistor 2 in each group of temperature measuring sub-devices, which is used to convert the input voltage of the mains power supply to power the online temperature detection device.

[0113] The input terminal of the second voltage conversion module is connected to the mains power supply, and the output terminal of the second voltage conversion module is connected to the second resistor 6 in each group of temperature measuring sub-devices. It is used to convert the input voltage of the mains power supply to power the online temperature detection device.

[0114] In this embodiment, the inventors further considered that when both the first power supply and the second power supply for the online temperature detection device are AC mains power, it may not be able to meet the power supply requirements of the online temperature detection device. Therefore, the online temperature detection device may also include a first voltage conversion module and a second voltage conversion module.

[0115] The first voltage conversion module can convert the input voltage of the mains power supply to ensure the power supply requirements of the first branch used for real-time temperature detection; the second voltage conversion module can convert the input voltage of the mains power supply to ensure the power supply requirements of the second branch used for real-time temperature monitoring.

[0116] It is evident that this method can reliably guarantee the power supply requirements of the online temperature detection device, and to a certain extent ensure the reliable operation of the various components in the online temperature detection device without them being burned out.

[0117] In a preferred embodiment, the control module 1 includes a first MCU, a second MCU, and a third MCU;

[0118] The first MCU is connected to the third MCU, the first voltage acquisition module 5 and the first controllable switch module 3 in each group of temperature measuring sub-devices, respectively. It is used to control the M NTC thermistors 4 in the N groups of temperature measuring sub-devices to be connected by controlling the conduction and cutoff of the first controllable switch module 3 in each group of temperature measuring sub-devices. It also receives the first voltage across the NTC thermistor 4 currently connected by the first voltage acquisition module 5, and determines the first temperature of the first position of the NTC thermistor 4 corresponding to the i-th first voltage according to the i-th first voltage and the preset voltage-resistance-temperature correspondence.

[0119] The second MCU is connected to the third MCU, the second voltage acquisition module 7, the second controllable switch module 8, and the third controllable switch module 9 in each group of temperature measuring sub-devices. It is used to control the connection of the NTC thermistor 4 acquired by the first voltage acquisition module 5 in the previous operation by controlling the conduction and cutoff of the second controllable switch module 8 and the third controllable switch module 9 in each group of temperature measuring sub-devices. It also receives the second voltage at both ends of the NTC thermistor 4 after it is connected, acquired by the second voltage acquisition module 7, acquired by the first voltage acquisition module 5 in the previous operation, and determines the second temperature of each first position corresponding to the first temperature according to the i-th second voltage and the preset voltage-resistance-temperature correspondence.

[0120] The third MCU is connected to the first MCU and the second MCU respectively, and is used to determine whether the NTC thermistor 4 corresponding to the i-th first position is faulty based on the first temperature and the second temperature of the i-th first position.

[0121] In this embodiment, the control module 1 may include a first MCU, a second MCU, and a third MCU. The third MCU can be understood as a remote control device.

[0122] The first MCU is specifically used to control the on and off of the first controllable switch module 3 in each group of temperature measuring sub-devices, so as to control the M NTC thermistors 4 in the N groups of temperature measuring sub-devices to be connected respectively, and to receive the first voltage across the NTC thermistor 4 currently connected by the first voltage acquisition module 5. The first MCU has a preset voltage-resistance-temperature correspondence stored in advance. Therefore, for the i-th first voltage, the first temperature of the first position of the NTC thermistor 4 corresponding to the i-th first voltage can be determined according to the preset voltage-resistance-temperature correspondence, and the first temperature is transmitted to the third MCU. It can be understood that the first MCU here includes a first communication module to realize data transmission with the third MCU, and the first communication module here can be a wireless communication module, such as WiFi or LoRa (Long Range Radio), or an isolated 485 communication module. This application does not make any special limitation here.

[0123] The second MCU is specifically used to control the on / off state of the second controllable switch module 8 and the third controllable switch module 9 in each group of temperature measuring sub-devices, so as to control the connection of the NTC thermistor 4 collected by the first voltage acquisition module 5 in the previous operation, and to receive the second voltage across the two ends of the NTC thermistor 4 after it is connected, collected by the second voltage acquisition module 7. The second MCU also pre-stores the preset voltage-resistance-temperature correspondence. Therefore, for the i-th second voltage, the second temperature of the first position of the NTC thermistor 4 corresponding to the i-th second voltage can be determined according to the preset voltage-resistance-temperature correspondence, and the second temperature is transmitted to the third MCU. It is understood that the second MCU includes a second communication module to realize data transmission with the third MCU, and this second communication module can be a wireless communication module, such as WiFi or LoRa (Long Range Radio), or an isolated 485 communication module; this application does not make any special limitations here.

[0124] Therefore, the third MCU is specifically used to determine whether the NTC thermistor 4 corresponding to each first position is faulty based on the first temperature and second temperature corresponding to each first position. That is, it determines whether the NTC thermistor 4 corresponding to the i-th first position is faulty based on the first temperature and second temperature of the i-th first position.

[0125] More specifically, a more concrete and comprehensive qualitative scheme for determining whether each NTC thermistor 4 is faulty is presented here. The inventors considered that the components in the first branch for real-time temperature detection, excluding the individual NTC thermistors 4, may also malfunction. For simplicity, this is referred to as the measurement circuit. Therefore, assuming that the components in the second branch for real-time temperature monitoring, excluding the individual NTC thermistors 4, are functioning normally, the following discussion uses the first and second temperatures at the i-th first position as an example. Four possible scenarios can be presented to characterize various abnormal situations:

[0126] When the NTC thermistor 4 at the i-th first position is normal and the measurement circuit at this location is also normal, the first temperature is the same as the second temperature. Therefore, it can be determined that the NTC thermistor 4 at the i-th first position is normal.

[0127] When the NTC thermistor 4 at the i-th first position is normal, but the measurement circuit here is abnormal, the first temperature is different from the second temperature. However, since the second temperature is measured under the condition that the second branch is working normally, it can be determined that the measurement circuit here is abnormal.

[0128] When an anomaly occurs at the NTC thermistor 4 at the i-th first position, and the measurement circuit at this location is also abnormal, since N*M NTC thermistors 4 are used in common, the first temperature and the second temperature should be the same at this time, but both are abnormal values. At this time, a direct judgment cannot be made. It can be further considered that the temperature difference on the cross-section at the same height should not be large. Therefore, the first temperature here can be compared with the first temperature corresponding to the NTC thermistor 4 at the adjacent position. If the difference is large, it can be determined that the NTC thermistor 4 at the i-th first position is abnormal.

[0129] When an anomaly occurs in the NTC thermistor 4 at the i-th first position, and the measurement circuit at this location is also abnormal, the first temperature and the second temperature may be the same or different, but they are likely to be different. Therefore, it can be basically determined that the anomaly is in the NTC thermistor 4 at the i-th first position.

[0130] As can be seen, the control logic of control module 1 can be reliably implemented through the above method, ensuring the reliable operation of the online temperature detection device.

[0131] In a preferred embodiment, the second controllable switch module 8 in each group of temperature measuring sub-devices includes a second two-to-one multiplexer and the third controllable switch module 9 includes a second M-to-one multiplexer, wherein the second two-to-one multiplexer includes one input and two outputs, and the second output terminal is left floating.

[0132] The input terminal of the second 2-to-1 multiplexer is connected to the second resistor 6, the control terminal of the second 2-to-1 multiplexer is connected to the control module 1, and the first output terminal of the second 2-to-1 multiplexer is connected to the input terminal of the second M-to-1 multiplexer and the second voltage acquisition module 7 respectively.

[0133] The M output terminals of the second M-to-one multiplexer are respectively connected to the first terminals of the M NTC thermistors 4, and the control terminal of the second M-to-one multiplexer is connected to the control module 1.

[0134] By controlling the on / off state of the second controllable switch module 8 and the third controllable switch module 9 in each group of temperature measuring sub-devices, the connection of the NTC thermistor 4, which was previously acquired by the first voltage acquisition module 5, is controlled, including:

[0135] The input terminal of the second two-to-one multiplexer in the temperature measuring sub-device corresponding to the NTC thermistor 4 acquired by the first voltage acquisition module 5 in the previous test is connected to the first output terminal. The input terminal of the second M-to-one multiplexer in the temperature measuring sub-device and the output terminal of the second M-to-one multiplexer corresponding to the NTC thermistor 4 acquired by the first voltage acquisition module 5 in the previous test are connected to the NTC thermistor 4 acquired by the first voltage acquisition module 5 in the previous test are also connected to the first output terminal.

[0136] In this embodiment, the second controllable switch module 8 in each group of temperature measuring sub-devices may include a second two-to-one multiplexer and the third controllable switch module 9 may include a second M-to-one multiplexer. When the input terminal of the second M-to-one multiplexer is connected to its own first output terminal, the first NTC thermistor 4 can be connected to the second branch for real-time temperature monitoring as described in the above embodiment. When the input terminal of the second M-to-one multiplexer is connected to its own second output terminal, the second NTC thermistor 4 can be connected to the second branch as described above, and so on.

[0137] Therefore, the control module 1 controls the connection of the NTC thermistor 4 acquired by the first voltage acquisition module 5 by controlling the on and off of the second controllable switch module 8 and the third controllable switch module 9 in each group of temperature measuring sub-devices. Specifically, it controls the connection between the input terminal and the first output terminal of the second two-to-one multiplexer in the group of temperature measuring sub-devices corresponding to the NTC thermistor 4 acquired by the first voltage acquisition module 5 in the previous test, so as to provide a basis for the connection of the NTC thermistor 4 acquired by the first voltage acquisition module 5 in the group of temperature measuring sub-devices. It also controls the connection between the input terminal of the second M-to-one multiplexer in the group of temperature measuring sub-devices and the output terminal of the second M-to-one multiplexer corresponding to the NTC thermistor 4 acquired by the first voltage acquisition module 5 in the previous test, so that the NTC thermistor 4 acquired by the first voltage acquisition module 5 in the previous test can be connected.

[0138] It is evident that this method reliably enables the execution logic of the second controllable switch module 8 and the third controllable switch module 9, ensuring the reliable establishment of the tracking and monitoring mechanism in this application.

[0139] As a preferred embodiment, before connecting the input terminal and the first output terminal of the second two-to-one multiplexer in the temperature measuring sub-device corresponding to the NTC thermistor 4 acquired by the first voltage acquisition module 5 in the previous step, the method further includes:

[0140] Determine the second position of the currently connected NTC thermistor 4;

[0141] The NTC thermistor 4 that was previously acquired by the first voltage acquisition module 5 is determined based on the second position and the preset NTC thermistor working sequence.

[0142] In this embodiment, in order to determine the NTC thermistor 4 that was previously acquired by the first voltage acquisition module 5, before controlling the connection between the input terminal and the first output terminal of the second two-to-one multiplexer in the temperature measuring sub-device corresponding to the NTC thermistor 4 acquired by the first voltage acquisition module 5, the second position of the currently connected NTC thermistor 4 is first determined, and the NTC thermistor 4 acquired by the first voltage acquisition module 5 is determined according to the second position and the preset NTC thermistor working sequence.

[0143] It is understood that the preset NTC thermistor operating sequence here can be the sequential order described in the above embodiments. For example, taking M=5 as an example, for the first branch, the preset NTC thermistor operating sequence here can be that the control module 1 controls the first NTC thermistor 4, the second NTC thermistor 4, the third NTC thermistor 4, the fourth NTC thermistor 4, and the fifth NTC thermistor 4 to be connected to the first branch respectively. Of course, the preset NTC thermistor operating sequence here can also be that the control module 1 controls the fifth NTC thermistor 4, the fourth NTC thermistor 4, the third NTC thermistor 4, the second NTC thermistor 4, and the first NTC thermistor 4 to be connected to the first branch respectively. This application does not make any special limitation here, but no matter which method is used, the logic of determining the NTC thermistor 4 collected by the first voltage acquisition module 5 last time according to the second position and the preset NTC thermistor operating sequence can be reliably realized.

[0144] As a preferred embodiment, determining the second location of the currently connected NTC thermistor 4 includes:

[0145] Control the connection between the input terminal and the second output terminal of the second two-to-one multiplexer in each group of temperature measuring sub-devices;

[0146] Starting with the first group of temperature measuring devices, each group of temperature measuring devices is rotated to determine the second position of the currently connected NTC thermistor 4. The rotation process specifically includes:

[0147] For the p-th group of temperature measuring devices selected in this round, where 1≤p≤N and p is an integer, the following steps are performed:

[0148] The input terminal of the second M-to-1 multiplexer is connected to the first to the Mth output terminals of the second M-to-1 multiplexer, respectively.

[0149] When the input terminal of the second M-to-1 multiplexer is turned on and each output terminal is turned on, determine whether the third voltage collected by the second voltage acquisition module 7 is 0; if not, determine which NTC thermistor 4 is the currently connected NTC thermistor 4 corresponding to which output terminal, wherein the position of the NTC thermistor 4 corresponding to which output terminal is the second position of the currently connected NTC thermistor 4.

[0150] In this embodiment, in order to determine the second location of the currently connected NTC thermistor 4, the second MCU will first control the input terminal of the second two-to-one multiplexer in each group of temperature measuring sub-devices to be connected to the second output terminal, so that the determination process will not affect the operation of the first branch, that is, it will not affect the temperature detection function of the online temperature detection device itself.

[0151] After that, the selection process starts from the first group of temperature measuring devices to determine which group and position the currently connected NTC thermistor 4 is in. Of course, the selection process can also start from any group of temperature measuring devices, as long as it can determine which group of temperature measuring devices the currently connected NTC thermistor 4 is in.

[0152] Therefore, for the p-th group of temperature measuring devices selected in this round, the input terminal of the second M-to-1 multiplexer is connected to the first to the M-th output terminals of the second M-to-1 multiplexer. Since the first branch is working normally at this time, there must be voltage across the NTC thermistor 4 currently connected. Therefore, it is determined whether the third voltage collected by the second voltage acquisition module 7 is 0 when the input terminal of the second M-to-1 multiplexer is connected to each output terminal. If so, it means that the NTC thermistor corresponding to the output terminal connected to the second M-to-1 multiplexer is 0. 4 is not the currently connected NTC thermistor 4; if not, determine which NTC thermistor 4 corresponds to which output terminal is the currently connected NTC thermistor 4, wherein the position of the NTC thermistor 4 corresponding to which output terminal is the second position of the currently connected NTC thermistor 4. In order to achieve the above determination process as quickly as possible, the control process of the second M-select multiplexer can be performed at a faster speed than when it is normally controlled to perform temperature monitoring, so as to quickly determine the second position of the currently connected NTC thermistor 4.

[0153] For a specific implementation description of a practical application of all the above embodiments, please refer to Figure 3 , Figure 3 This is a schematic diagram of another online temperature detection device provided by the present invention. Figure 3Taking a scenario where both the first and second power supplies are AC 220V mains power inputs, with N=4 and M=4, the online temperature detection device in practical applications can specifically include a first MCU 11, a first voltage acquisition module 5, a first voltage conversion module, four sets of four NTC thermistors 4, four first 2-to-1 multiplexers 32, four first 4-to-1 multiplexers 33, four first voltage followers, and a first analog-to-digital converter with four input channels; a second MCU, a second voltage acquisition module 7, a second voltage conversion module, four second 2-to-1 multiplexers, four second 4-to-1 multiplexers, four second voltage followers, and a second analog-to-digital converter with four input channels; and a third MCU serving as a remote control module 1. Considering that some content has already been fully and clearly described in the previous embodiments, it will not be repeated here, and due to space limitations in the image display, [further details are needed]. Figure 3 The diagram shows only the structural schematics of the parts of the embodiments that are intended to be explained.

[0154] First, it should be noted that in the actual physical device, the four sets of four NTC thermistors 4 can be plugged into four pre-set first slots for plugging in four NTC thermistors 4. In parallel with each of the first slots mentioned above, there are also four sets of four second slots, which are used to connect the various devices that are connected to the four sets of four NTC thermistors 4 through cables according to the overall circuit connection relationship provided in this application. This application does not make any special limitations here.

[0155] The AC220V input cannot directly power the online temperature detection device. The part within the dashed box is the first voltage conversion module mentioned above. Here, the AC220V to DC12V module can convert 220V AC power into 12V DC power. Subsequently, the DC12V to 5V first circuit can generate the DC5V power supply connected to the first resistor 2. The advantage of this setting is that the DC12V to 5V first circuit can essentially be understood as a series voltage regulator circuit, namely an LDO (Low Dropout Voltage Regulator). It has good output stability, fast load response, and small output ripple. It is suitable for occasions with low power supply interference and sensitivity to ripple, thus requiring stable power supply, such as analog circuits. Therefore, this structure can better meet the power supply requirements of the various devices in the first branch. Of course, the power supply of the first two-to-one multiplexer 32 or the first four-to-one multiplexer 33 can also come from this, which will not be specifically explained here.

[0156] The second DC12V to 5V circuit is essentially just a regular DC to DC circuit with higher conversion efficiency. In addition, the subsequent DC5V to 3.3V third circuit can meet the power supply requirements of the first MCU11. This is because the first MCU11 is not sensitive to ripple.

[0157] Therefore, as explained in the above embodiments, in order to closely approximate the actual application and simplify the control logic as much as possible, we will again take the first 4-to-1 multiplexer 33 as an example. For any one of the first 4-to-1 multiplexers 33, only two control terminals are needed to connect to the two control lines from the control module 1, one input terminal is connected to the first resistor 2, and four output terminals are respectively connected to the four NTC thermistors 4 in the temperature measuring sub-device where the first 4-to-1 multiplexer 33 is located. Similarly, assuming that the two control terminals of each first 4-to-1 multiplexer 33 are G1 and G2, and the four output terminals correspond to channels 0, 1, 2 and 3 respectively, the control module 1 can select channel 0 by outputting "00", select channel 1 by outputting "01", select channel 2 by outputting "10" and select channel 3 by outputting "11", thereby realizing parallel control and selection of which output terminal is connected to the current input terminal of each first 4-to-1 multiplexer 33.

[0158] More specifically, the first MCU11 firstly controls the channel 0 of the first 4-to-1 multiplexer 33 in the 4 groups of temperature measuring sub-devices to be turned on, and finally obtains the first temperature corresponding to channel 0 as T1-0, T2-0, T3-0 and T4-0, where the number after T indicates which group of temperature measuring sub-device;

[0159] Secondly, the first MCU11 simultaneously controls the first 4-to-1 multiplexer 33 in the 4 sets of temperature measuring sub-devices to turn on channel 1, and finally obtains the first temperature corresponding to channel 1 as T1-1, T2-1, T3-1 and T4-1;

[0160] Secondly, the first MCU11 simultaneously controls the first 4-to-1 multiplexer 33 in the four sets of temperature measuring sub-devices to turn on channel 2, and finally obtains the first temperatures corresponding to channel 2 as T1-2, T2-2, T3-2 and T4-2; finally, the first MCU11 simultaneously controls the first 4-to-1 multiplexer 33 in the four sets of temperature measuring sub-devices to turn on channel 3, and finally obtains the first temperatures corresponding to channel 3 as T1-3, T2-3, T3-3 and T4-3.

[0161] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0162] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the stated element.

[0163] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An online temperature detection device, characterized in that, It includes a control module and N sets of temperature measuring sub-devices; the N sets of temperature measuring sub-devices are respectively set at N heights above the ground in the silo, where N is an integer not less than 1; Each set of temperature measuring sub-devices includes a first resistor, a first controllable switch module, M NTC thermistors, a first voltage acquisition module, a second resistor, a second voltage acquisition module, a second controllable switch module, and a third controllable switch module, wherein the M NTC thermistors are respectively disposed at different positions of the cross section at the height, and M is an integer not less than 1; The first resistor is connected to the power supply and the first controllable switch module respectively. The first controllable switch module is also connected to the first terminals of the M NTC thermistors and the third controllable switch module. The second terminals of the M NTC thermistors are connected to the second voltage acquisition module and the common terminal of the connection is grounded. The second resistor is connected to the power supply and the second controllable switch module respectively. The second controllable switch module is also connected to the third controllable switch module and the second voltage acquisition module. The control module is used to control the connection of M NTC thermistors in N groups of temperature measuring sub-devices by controlling the on and off states of the first controllable switch modules in each group of temperature measuring sub-devices, and to receive the first voltage across the currently connected NTC thermistor collected by the first voltage acquisition module; to control the connection of the NTC thermistor previously collected by the first voltage acquisition module by controlling the on and off states of the second and third controllable switch modules in each group of temperature measuring sub-devices, and to receive the second voltage across the NTC thermistor after its connection by the first voltage acquisition module; and to determine whether the NTC thermistor corresponding to the i-th first voltage is faulty based on the i-th first voltage and the second voltage corresponding to the i-th first voltage, where 1≤i≤N*M; Determining whether the NTC thermistor corresponding to the i-th first voltage is faulty based on the i-th first voltage and the second voltage corresponding to the i-th first voltage includes: The first temperature of the first position where the NTC thermistor corresponding to the i-th first voltage is located is determined according to the i-th first voltage and the preset voltage-resistance-temperature correspondence. The second temperature of each first position corresponding to the first temperature is determined according to the i-th second voltage and the preset voltage-resistance-temperature correspondence. When the first temperature is different from the second temperature, and the second temperature is normal, the measurement circuit is determined to be abnormal. If the first temperature is the same as the second temperature and the difference between the first temperature and the first temperature corresponding to the NTC thermistor at the adjacent position exceeds a preset difference, the NTC thermistor at the i-th first position is determined to be abnormal. The measurement circuit is a circuit consisting of the first resistor, the first controllable switch module, and the first voltage acquisition module.

2. The online temperature detection device as described in claim 1, characterized in that, The first controllable switch module in each group of temperature measuring sub-devices includes a Q-select multiplexer, wherein Q=M+1 and the Q-select multiplexer includes one input and Q outputs, with the Qth output terminal left floating. The input terminals of the Q-select multiplexer are connected to the first resistor and the first voltage acquisition module, respectively. The control terminal of the Q-select multiplexer is connected to the control module. The Q-1 output terminals of the Q-select multiplexer are connected to the first terminals of the M NTC thermistors one by one. By controlling the on / off state of the first controllable switch module in each group of temperature measuring sub-devices, the M NTC thermistors in the N groups of temperature measuring sub-devices are respectively connected, including: When the temperature measuring sub-device of the s-th group is selected, the input terminal of the Q-select multiplexer is connected to the first output terminal to the Q-1 output terminal of the Q-select multiplexer to connect the M NTC thermistors of the temperature measuring sub-device of the s-th group respectively, where 1≤s≤N and s is an integer; When the temperature measuring sub-device in the s-th group is not selected, the input terminal of the Q-select multiplexer is connected to the Q-th output terminal of the Q-select multiplexer so that all M NTC thermistors in the temperature measuring sub-device in the s-th group are disconnected from the branch where the Q-select multiplexer is located.

3. The online temperature detection device as described in claim 1, characterized in that, The first controllable switch module in each group of temperature measuring sub-devices includes a first two-to-one multiplexer and a first M-to-one multiplexer, wherein the first two-to-one multiplexer includes one input and two outputs, and the second output terminal is left floating. The input terminals of the first two-to-one multiplexer are connected to the first resistor and the first voltage acquisition module, respectively. The control terminal of the first two-to-one multiplexer is connected to the control module. The first output terminal of the first two-to-one multiplexer is connected to the input terminal of the first M-to-one multiplexer. The M output terminals of the first M-to-1 multiplexer are respectively connected to the first terminals of the M NTC thermistors, and the control terminal of the first M-to-1 multiplexer is connected to the control module. By controlling the on / off state of the first controllable switch module in each group of temperature measuring sub-devices, the M NTC thermistors in the N groups of temperature measuring sub-devices are respectively connected, including: When the temperature measuring sub-device of the z-th group is selected, the input terminal of the first two-to-one multiplexer is connected to the first output terminal of the first two-to-one multiplexer, and the input terminal of the first M-to-one multiplexer is connected to the first output terminal to the M-th output terminal of the first M-to-one multiplexer, so as to connect the M NTC thermistors of the temperature measuring sub-device of the z-th group respectively, where 1≤z≤N and z is an integer; When the temperature measuring sub-device of the z-th group is not selected, the input terminal of the first two-to-one multiplexer is connected to the second output terminal of the first two-to-one multiplexer, so that all M NTC thermistors of the temperature measuring sub-device of the z-th group are disconnected from the branch where the first two-to-one multiplexer and the first M-to-one multiplexer are located.

4. The online temperature detection device as described in claim 1, characterized in that, Each of the temperature measuring sub-devices further includes a first analog-to-digital converter and a second analog-to-digital converter; The first analog-to-digital converter is connected to the first voltage acquisition module and the control module respectively, and is used to perform analog-to-digital conversion on the data acquired by the first voltage acquisition module and transmit the converted result to the control module. The second analog-to-digital converter is connected to the second voltage acquisition module and the control module respectively, and is used to perform analog-to-digital conversion on the data acquired by the second voltage acquisition module and transmit the converted result to the control module.

5. The online temperature detection device as described in claim 4, characterized in that, Each of the temperature measuring sub-devices further includes a first voltage follower and a second voltage follower; The first voltage follower is disposed between the first voltage acquisition module and the first analog-to-digital converter, and the input terminal of the first voltage follower is connected to the first voltage acquisition module, and the output terminal of the first voltage follower is connected to the first analog-to-digital converter, for buffering and isolating the data acquired by the first voltage acquisition module; The second voltage follower is disposed between the second voltage acquisition module and the second analog-to-digital converter, and the input terminal of the second voltage follower is connected to the second voltage acquisition module, and the output terminal of the second voltage follower is connected to the second analog-to-digital converter, for buffering and isolating the data acquired by the second voltage acquisition module.

6. The online temperature detection device as described in claim 1, characterized in that, The first power supply, the first resistor, the first controllable switch module, and M NTC thermistors constitute the first branch for real-time temperature detection. The second power supply, the second resistor, the second controllable switch module, the third controllable switch module, and M NTC thermistors constitute the second branch for real-time temperature monitoring. When both the first power source and the second power source are AC power sources, the online temperature detection device further includes a first voltage conversion module and a second voltage conversion module. The input terminal of the first voltage conversion module is connected to the mains power supply, and the output terminal of the first voltage conversion module is connected to the first resistor in each group of temperature measuring sub-devices, for converting the input voltage of the mains power supply to power the online temperature detection device. The input terminal of the second voltage conversion module is connected to the mains power supply, and the output terminal of the second voltage conversion module is connected to the second resistor in each group of temperature measuring sub-devices, for converting the input voltage of the mains power supply to power the online temperature detection device.

7. The online temperature detection device as described in claim 1, characterized in that, The control module includes a first MCU, a second MCU, and a third MCU; The first MCU is connected to the third MCU, the first voltage acquisition module and the first controllable switch module in each group of temperature measuring sub-devices, respectively. It is used to control the M NTC thermistors in the N groups of temperature measuring sub-devices to be connected by controlling the conduction and cutoff of the first controllable switch modules in each group of temperature measuring sub-devices. It also receives the first voltage across the NTC thermistor currently connected by the first voltage acquisition module and determines the first temperature of the first position of the NTC thermistor corresponding to the i-th first voltage according to the i-th first voltage and the preset voltage-resistance-temperature correspondence. The second MCU is connected to the third MCU, the second voltage acquisition module, the second controllable switch module, and the third controllable switch module in each group of temperature measuring sub-devices, respectively. It is used to control the connection of the NTC thermistor acquired by the first voltage acquisition module in the previous operation by controlling the conduction and cutoff of the second controllable switch module and the third controllable switch module in each group of temperature measuring sub-devices. It also receives the second voltage at both ends of the NTC thermistor after it is connected by the first voltage acquisition module in the previous operation by the second voltage acquisition module. Based on the i-th second voltage and the preset voltage-resistance-temperature correspondence, it determines the second temperature of each of the first positions that corresponds one-to-one with the first temperature. The third MCU is connected to the first MCU and the second MCU respectively, and is used to determine whether the NTC thermistor corresponding to the i-th first position is faulty based on the first temperature and the second temperature of the i-th first position. Determining whether the NTC thermistor corresponding to the i-th first position is faulty based on the first temperature and the second temperature at the i-th first position includes: When the first temperature is different from the second temperature, and the second temperature is normal, the measurement circuit is determined to be faulty. If the first temperature is the same as the second temperature and the difference between the first temperature and the first temperature corresponding to the NTC thermistor at the adjacent position exceeds a preset difference, the NTC thermistor at the i-th first position is determined to be abnormal. The measurement circuit is a circuit consisting of the first resistor, the first controllable switch module, and the first voltage acquisition module.

8. The online temperature detection device according to any one of claims 1 to 7, characterized in that, The second controllable switch module in each group of temperature measuring sub-devices includes a second two-to-one multiplexer and the third controllable switch module includes a second M-to-one multiplexer, wherein the second two-to-one multiplexer includes one input and two outputs, and the second output terminal is left floating. The input terminal of the second 2-to-1 multiplexer is connected to the second resistor, the control terminal of the second 2-to-1 multiplexer is connected to the control module, and the first output terminal of the second 2-to-1 multiplexer is connected to the input terminal of the second M-to-1 multiplexer and the second voltage acquisition module, respectively. The M output terminals of the second M-to-one multiplexer are respectively connected to the first terminals of the M NTC thermistors, and the control terminal of the second M-to-one multiplexer is connected to the control module. By controlling the on / off state of the second and third controllable switch modules in each group of temperature measuring sub-devices, the connection of the NTC thermistor previously acquired by the first voltage acquisition module is controlled, including: The system controls the connection between the input terminal and the first output terminal of the second two-to-one multiplexer in the group of temperature measuring devices corresponding to the NTC thermistor acquired by the first voltage acquisition module in the previous test, and controls the connection between the input terminal of the second M-to-one multiplexer in the group of temperature measuring devices and the output terminal of the second M-to-one multiplexer corresponding to the NTC thermistor acquired by the first voltage acquisition module in the previous test, so that the NTC thermistor acquired by the first voltage acquisition module in the previous test can be connected.

9. The online temperature detection device as described in claim 8, characterized in that, Before connecting the input terminal and the first output terminal of the second two-to-one multiplexer in the temperature measuring sub-device corresponding to the NTC thermistor acquired by the first voltage acquisition module in the previous step, the following steps are also included: Determine the second location of the currently connected NTC thermistor; The NTC thermistor acquired by the first voltage acquisition module in the previous transaction is determined based on the second position and the preset NTC thermistor operating sequence.

10. The online temperature detection device as described in claim 9, characterized in that, Determining the second location of the currently connected NTC thermistor includes: Control the connection between the input terminal and the second output terminal of the second two-to-one multiplexer in each group of temperature measuring sub-devices; Starting with the temperature measuring sub-devices in group 1, the temperature measuring sub-devices in each group are selected in a round-robin fashion to determine the second position of the currently connected NTC thermistor. The round-robin selection step specifically includes: For the temperature measuring sub-devices in the p-th group selected in this round, where 1≤p≤N and p is an integer, the following steps are performed: The input terminal of the second M-to-1 multiplexer is connected to the first to the Mth output terminals of the second M-to-1 multiplexer, respectively. Determine whether the third voltage acquired by the second voltage acquisition module is 0 when the input terminal of the second M-to-1 multiplexer is turned on and each output terminal is turned on respectively; if not, determine which NTC thermistor corresponds to which output terminal is the currently connected NTC thermistor, wherein the position of the NTC thermistor corresponding to which output terminal is the second position of the currently connected NTC thermistor.

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