Circuit fault location system and air conditioning system

Abstract

The utility model discloses a kind of circuit fault positioning system and air conditioning system, the circuit fault positioning system includes main control chip, still including power supply detection module and signal detection module connected with the main control chip;The power supply detection module is used to sample and obtain power signal, and the first sampling value is obtained after the power signal is divided voltage and is fed back to the main control chip;The signal detection module is used to sample and obtain signal to be measured, and the second sampling value is obtained after signal to be measured is filtered and amplified and is fed back to the main control chip;The main control chip judges whether the power signal and signal to be measured are abnormal according to the first sampling value and the second sampling value. Compared with prior art, the utility model can realize circuit self-checking function and fault judging mechanism, can quickly detect and position fault in running process, reduce downtime caused by circuit fault.

Description

Technical Field

[0001] This utility model relates to the field of circuit fault detection, and in particular to a circuit fault location system and an air conditioning system. Background Technology

[0002] With the development of the home appliance market, air conditioner circuit control systems have gradually become more mature. However, existing air conditioner circuit control systems often struggle to quickly detect and locate circuit faults during operation, resulting in low system reliability and high maintenance costs.

[0003] Currently, air conditioning circuit control systems lack effective hardware self-testing mechanisms and reserved test points, which requires additional debugging equipment and complex operations during factory testing and on-site maintenance, affecting the maintainability and testing efficiency of the system.

[0004] Therefore, how to design a circuit fault location system and an air conditioning system that can quickly detect and locate the location of circuit faults is a technical problem that the industry urgently needs to solve. Utility Model Content

[0005] In view of the problem that it is difficult to quickly detect and locate circuit faults in the existing air conditioning circuit control system during operation, this utility model proposes a circuit fault location system and an air conditioning system.

[0006] The technical solution of this utility model is to propose a circuit fault location system, which includes a main control chip, and also includes a power detection module and a signal detection module connected to the main control chip.

[0007] The power detection module is used to sample and acquire power signals, and after voltage division of the power signals, obtain the first sampled value and feed it back to the main control chip.

[0008] The signal detection module is used to sample and acquire the signal to be tested, and after filtering and amplifying the signal to be tested, obtain a second sample value and feed it back to the main control chip.

[0009] The main control chip determines whether the power signal and the signal under test are abnormal based on the first sample value and the second sample value.

[0010] Furthermore, the power detection module includes multiple power sampling circuits and voltage sampling circuits connected to each power sampling circuit in a corresponding manner.

[0011] The input terminal of each power sampling circuit is connected to the power signal, the output terminal of each power sampling circuit is connected to the input terminal of the voltage sampling circuit, and the output terminal of each voltage sampling circuit is connected to the main control chip.

[0012] Furthermore, the voltage sampling circuit includes at least one sampling resistor and multiple voltage dividing resistors;

[0013] All the voltage divider resistors are connected in series between the output terminal of the power sampling circuit and ground. One end of the series connection of all the sampling resistors is connected between any two adjacent voltage divider resistors, and the other end of the series connection of all the sampling resistors is connected to the input terminal of the main control chip.

[0014] Furthermore, the signal detection module includes multiple signal sampling circuits and current sampling circuits connected to each of the signal sampling circuits in a corresponding manner.

[0015] The input terminal of each of the signal sampling circuits is connected to the signal to be measured, the output terminal of each of the signal sampling circuits is connected to the input terminal of the current sampling circuit, and the output terminal of each of the current sampling circuits is connected to the main control chip.

[0016] Furthermore, the current sampling circuit includes an amplifier, a first input resistor, a second input resistor, and a first current-limiting resistor;

[0017] The first input terminal of the amplifier is connected in series with the first input resistor and then connected to the output terminal of the signal sampling circuit. The second input terminal of the amplifier is connected in series with the second input resistor and then grounded. The output terminal of the amplifier is connected in series with the first current limiting resistor and then connected to the input terminal of the main control chip.

[0018] Furthermore, the current sampling circuit also includes a filter capacitor, one end of which is connected between the first current-limiting resistor and the input terminal of the main control chip, and the other end of the first current-limiting resistor is grounded.

[0019] Furthermore, it also includes a display module connected to the main control chip;

[0020] The display module has multiple indicator lights, which are used to indicate the sampling status of the power detection module and the signal detection module.

[0021] Furthermore, the display module includes multiple display circuits, each of which includes at least one indicator light and a second current-limiting resistor connected in series with the indicator light;

[0022] One end of the indicator light and the second current-limiting resistor are connected in series to the output terminal of the main control chip, and the other end of the indicator light and the second current-limiting resistor are connected to the power supply.

[0023] Furthermore, the display circuit includes a first indicator light, a second indicator light, and a third indicator light for emitting different light colors;

[0024] The first indicator light is used to indicate the abnormal position of the power detection module, the second indicator light is used to indicate the abnormal position of the signal detection module, and the third indicator light is used to indicate whether the sampling status of the power detection module and the signal detection module is abnormal.

[0025] This utility model also proposes an air conditioning system, which has the above-mentioned circuit fault location system.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] This utility model is equipped with a power detection module and a signal detection module, which can be used to acquire power signals and signals under test respectively, and feed them back to the main control chip. The main control chip can determine whether the power signals and signals under test are abnormal based on the first and second sampled values ​​obtained from the feedback, thereby realizing rapid detection and fault location when the circuit is abnormal, and reducing downtime caused by circuit faults. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the circuit fault location system in this utility model;

[0030] Figure 2 This is a schematic diagram of the power sampling circuit in this utility model;

[0031] Figure 3 This is a schematic diagram of the voltage sampling circuit in this utility model;

[0032] Figure 4 This is a schematic diagram of the signal sampling circuit in this utility model;

[0033] Figure 5 This is a schematic diagram of the current sampling circuit in this utility model;

[0034] Figure 6 This is a schematic diagram of the display circuit in this utility model;

[0035] Figure 7 This is a flowchart illustrating the abnormal judgment of power supply signal and test signal by the main control chip in this utility model;

[0036] Figure 8This is a display logic diagram of the display module in this utility model. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0039] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0040] Currently, air conditioning circuit control systems often struggle to quickly detect and locate circuit faults during operation, resulting in low system reliability and high maintenance costs.

[0041] To address the aforementioned problems, this utility model proposes a circuit fault location system, aiming to achieve rapid detection and location of circuit faults. Please refer to [link / reference]. Figure 1 The circuit fault location system proposed in this utility model includes a main control chip, a power detection module and a signal detection module connected to the main control chip;

[0042] The power detection module is used to sample and acquire the power signal, and after voltage division of the power signal, obtain the first sampled value and feed it back to the main control chip;

[0043] The signal detection module is used to sample and acquire the signal to be tested, and after filtering and amplifying the signal to be tested, the second sampled value is fed back to the main control chip;

[0044] The main control chip determines whether the power supply signal and the signal under test are abnormal based on the first and second sampled values.

[0045] As can be seen from the above settings, this utility model, through the setting of the power detection module and the signal detection module, can monitor and acquire the power signal and the signal under test in real time, and feed them back to the main control chip. The main control chip can determine whether the power signal and the signal under test are abnormal. Under this setting, when a circuit fault occurs, the main control chip can determine whether the power supply part is faulty based on whether the power signal is abnormal, and determine whether the control chip is faulty based on whether the signal under test is abnormal, thereby realizing rapid detection and location of circuit faults.

[0046] The circuit fault location system proposed in this utility model can be used in air conditioning circuit control systems. By connecting the power detection module to the power supply of the air conditioning circuit control system and the signal detection module to the control chip of the air conditioning circuit control system, the fault location of the air conditioning circuit control system can be specifically determined based on the power signal and the signal to be tested fed back by the main control chip, thereby reducing downtime caused by circuit faults.

[0047] The power detection circuit proposed in this utility model includes multiple power sampling circuits and voltage sampling circuits that are connected one-to-one with the power sampling circuits.

[0048] The input of each power sampling circuit is connected to a power signal, the output of each power sampling circuit is connected to the input of a voltage sampling circuit, and the output of each voltage sampling circuit is connected to the main control chip.

[0049] The power sampling circuit here is used to perform the above-mentioned sampling and acquisition of power signals, and the voltage sampling circuit is used to perform the above-mentioned acquisition of the first sample value and feedback to the main control chip.

[0050] This invention uses the above-mentioned power sampling circuit and voltage sampling circuit connection to sample the power signal because the voltage of the power signal of the air conditioning circuit control system is generally high, while the voltage sampling sensor can detect a relatively low operating voltage. If the power signal is directly connected to the main control chip and the above-mentioned power sampling circuit and voltage sampling circuit are omitted, the main control chip may be damaged due to the excessively high voltage of the power signal.

[0051] In this invention, by setting up the voltage sampling circuit described above, the voltage of the power signal can be reduced by a preset ratio after being divided by multiple voltage dividing resistors, thereby avoiding damage to the main control chip due to excessive voltage. The preset ratio is determined by the ratio of each resistor in the voltage sampling circuit.

[0052] Please see Figure 2The power sampling circuit in this utility model has multiple channels. Here, V1, V2, and V3 represent the power signals output from the secondary of the switching power supply in the air conditioning circuit control system, and DV1, DV2, and DV3 are the power signals obtained by the power sampling circuit.

[0053] Please see Figure 3 The voltage sampling circuit in this utility model includes at least one sampling resistor and multiple voltage dividing resistors;

[0054] All voltage divider resistors are connected in series between the output of the power sampling circuit and ground. One end of the series connection of all sampling resistors is connected between any two adjacent voltage divider resistors, and the other end of the series connection of all sampling resistors is connected to the input of the main control chip.

[0055] Figure 3 The diagram shows a voltage sampling circuit connected to the power sampling circuit. DVx is the power signal mentioned above. Here, x can be 1, 2, or 3. When x is 1, the voltage sampling circuit is connected to the power sampling circuit that obtains DV1. When x is 2, the voltage sampling circuit is connected to the power sampling circuit that obtains DV2. When x is 3, the voltage sampling circuit is connected to the power sampling circuit that obtains DV3.

[0056] The resistor connected to DVx here is a voltage divider resistor. Figure 3 In this embodiment, three voltage divider resistors are provided, which are connected in series between DVx and ground, and are used to perform series voltage division on the acquired power signal;

[0057] According to the principle of series circuits, the voltage drop across each resistor in a series circuit is proportional to its resistance. Therefore, for a given voltage-dividing resistor, the voltage across it is the product of the ratio of its resistance to the total resistance of all voltage-dividing resistors and the power supply signal. For example, assuming there are three voltage-dividing resistors, R1, R2, and R3, the voltage across resistor R1 is actually R1*DVx / (R1+R2+R3). In this invention, one end of the sampling resistor is connected between any two voltage-dividing resistors to obtain the voltage after voltage division.

[0058] It should be noted that when one end of the sampling resistor is connected between any two voltage divider resistors, the voltage it obtains may not be the voltage of a single voltage divider resistor, but rather the voltage obtained with ground as the reference zero potential. The voltage obtained by the sampling resistor is the sum of the voltages divided by all the voltage divider resistors between the sampling resistor and ground.

[0059] After the above settings are applied, the magnitude of the power signal can be reduced proportionally, thereby avoiding the problem of excessive power signal voltage damaging the main control chip. In addition, the purpose of setting the sampling resistor here is to further limit the current and prevent excessive current from entering the main control chip.

[0060] Appendix Figure 3 DVx-IN in the figure is the first sampled value obtained by the power detection module, which is fed back to the main control chip to determine whether the power signal is abnormal.

[0061] The method of this utility model for determining whether a power signal is abnormal is based on the average value of multiple DVx-IN values. The method determines whether the final average value exceeds a preset voltage range. If it does, the power signal is determined to be abnormal.

[0062] Furthermore, the signal detection module in this utility model includes multiple signal sampling circuits and current sampling circuits that are connected one-to-one with the signal sampling circuits.

[0063] The input terminal of each signal sampling circuit is connected to the signal to be measured, the output terminal of each signal sampling circuit is connected to the input terminal of the current sampling circuit, and the output terminal of each current sampling circuit is connected to the main control chip.

[0064] The signal sampling circuit here is used to perform the above-mentioned action of acquiring the signal to be measured, and the current sampling circuit is used to perform the above-mentioned action of filtering and amplifying to acquire the second sample value and feeding it back to the main control chip.

[0065] The purpose of setting up a current sampling circuit in this invention is to amplify the acquired test signal. As mentioned above, this invention can be used in an air conditioning circuit control system. At this time, the test signal acquired by the signal detection module is actually a signal wave sent by the control chip in the air conditioning circuit control system. Its corresponding current is small. If it is sampled directly, there may be a large error. Therefore, it is necessary to set up a corresponding current sampling circuit to amplify the above-mentioned small test signal for normal sampling.

[0066] Please see Figure 4 In the signal sampling circuit, d1, d2, and d3 are the signal waves sent by the control chip in the air conditioning circuit control system. After passing through the signal sampling circuit, they are converted into DI1, DI2, and DI3 for output.

[0067] Please see Figure 5 The current sampling circuit in this utility model includes an amplifier, a first input resistor, a second input resistor, and a first current limiting resistor;

[0068] The first input terminal of the amplifier is connected in series with the first input resistor and then connected to the output terminal of the signal sampling circuit. The second input terminal of the amplifier is connected in series with the second input resistor and then grounded. The output terminal of the amplifier is connected in series with the first current limiting resistor and then connected to the input terminal of the main control chip.

[0069] The above-mentioned configuration in this utility model constitutes a non-inverting amplifier circuit, which can amplify the signal wave obtained by the signal sampling circuit according to a set ratio and finally transmit it to the main control chip for the main control chip to obtain the second sampling value.

[0070] Appendix Figure 5 DIx-IN in the diagram represents the second sampled value obtained by the signal detection module. This value is fed back to the main control chip to determine whether the power signal is abnormal. Here, x can be 1, 2, or 3. When x is 1, the current sampling circuit is connected to the current sampling circuit that obtains the signal of DI1. When x is 2, the current sampling circuit is connected to the current sampling circuit that obtains the signal of DI2. When x is 3, the current sampling circuit is connected to the current sampling circuit that obtains the signal of DI3.

[0071] In other words, by setting up the current sampling circuit described above, this utility model realizes the detection of the signal to be tested, namely the signal wave emitted by the air conditioning circuit control system, thereby achieving accurate acquisition of the second sampling value.

[0072] Please see Figure 5 The current sampling circuit proposed in this utility model also includes a filter capacitor, one end of which is connected between the first current limiting resistor and the input terminal of the main control chip, and the other end of the first current limiting resistor is grounded.

[0073] The purpose of this invention is to set the filter capacitor to avoid noise interference during the sampling process and to avoid errors in the second sampled value obtained from the sampling of the signal under test.

[0074] Furthermore, this utility model also includes a display module connected to the main control chip. The display module has multiple indicator lights, which are used to indicate the sampling status of the power detection module and the signal detection module.

[0075] As mentioned above, this utility model can determine the fault location and fault information in the air conditioning circuit control system through the main control chip, power detection module and signal detection module. However, for users, the fault information obtained is not intuitive. Therefore, this utility model is equipped with the above-mentioned indicator light. By corresponding the illumination state of the indicator light with the fault location and fault information, users can intuitively obtain the specific fault location and fault information, which will improve the efficiency of subsequent after-sales testing.

[0076] Please see Figure 6 In this utility model, the display module includes multiple display circuits, and each display circuit includes at least one indicator light and a second current-limiting resistor connected in series with the indicator light;

[0077] One end of the indicator light and the second current-limiting resistor are connected in series to the output terminal of the main control chip, and the other end of the indicator light and the second current-limiting resistor are connected to the power supply.

[0078] From the above appendix Figure 6 As can be seen, the indicator lights in this utility model are LED lights, namely LED R, LED Y and LED B, which are used to display different light colors. The different light colors are used to inform the fault information and fault location of the air conditioning circuit control system. Here, a second current limiting resistor is also connected in series in this utility model to avoid the problem of excessive current in the circuit causing damage to the LED lights.

[0079] C1, C2, and C3 are the corresponding control signals issued by the main control chip. The voltage duty cycle of C1, C2, and C3 is controlled by PWM to achieve different on / off flashing patterns of the LEDs. Based on the information identified by the power detection module and the signal detection module, the main control chip outputs different PWM control signals to C1, C2, and C3 to indicate the different lighting states of LEDs R, LEDY, and LEDB, thereby informing the user of the specific fault location and fault information.

[0080] The display circuit of this utility model includes a first indicator light, a second indicator light, and a third indicator light for emitting different light colors;

[0081] The first indicator light is used to indicate the abnormal position of the power detection module, the second indicator light is used to indicate the abnormal position of the signal detection module, and the third indicator light is used to indicate whether the sampling status of the power detection module and the signal detection module is abnormal.

[0082] Here, the first indicator light corresponds to LED R, which is red; the second indicator light corresponds to LED Y, which is yellow; and the third indicator light corresponds to LED B, which is blue. Please refer to [link / reference]. Figure 8 The display logic of the display module in this utility model is as follows:

[0083] The red light indicates the detection status of the power module (the power module here refers to the power module in the air conditioning circuit control system, which is detected by the power detection module in this utility model), the yellow light indicates the detection status of the signal module (the signal module here refers to the signal module in the air conditioning circuit control system, i.e., the control chip mentioned above, which is used to emit corresponding signal waves and is detected by the signal detection module in this utility model), and the blue light is an auxiliary indicator light.

[0084] A solid red light indicates that the power module is functioning normally; a flashing red light indicates an abnormality in the X-channel of the power module. Different flashing frequencies are set for different channels of the power module.

[0085] A solid yellow light indicates that the signal module is functioning normally; a flashing yellow light indicates an abnormality in the X-channel of the signal module. Different flashing frequencies are set for different signal modules on different channels.

[0086] A solid blue light indicates that the power module and signal module are functioning normally; a flashing blue light indicates that at least one of the power module or signal module is malfunctioning.

[0087] Please see Figure 7 This is a flowchart of the main control chip's judgment of abnormal power supply signals and signals under test in this utility model. The specific process is as follows:

[0088] The DSP main control chip (i.e., the main control chip mentioned above) receives external instructions and executes the DSP wave detection operation;

[0089] First, a power supply detection stage is performed. DVx_IN is acquired through the power supply sampling circuit and voltage sampling circuit. After the counter k accumulates to m, the power supply sampling and voltage sampling stage is exited, and calculation is performed. If the calculated value falls within [Vx-δ, Vx+δ], it indicates that the power module is normal; if the calculated value falls within [0-δ, 0+δ], it indicates that the power module is abnormal and has no output voltage; otherwise, it indicates that the power detection module is abnormal and requires manual troubleshooting.

[0090] Next, in the signal detection stage, DIx_IN is obtained through the signal sampling circuit and the current sampling circuit. After the counter k accumulates to n, the signal sampling and current sampling stages are exited, and the calculation is performed. If the calculated value falls within [Ix-δ, Ix+δ], the signal module is normal; if the calculated value falls within [0-δ, 0+δ], the signal module is abnormal and has no output; otherwise, the signal detection module is abnormal and manual troubleshooting is required.

[0091] Based on the above configuration, this utility model has at least the following beneficial effects compared with the prior art: This utility model is provided with a power detection module and a signal detection module, which can be used to acquire power signals and signals under test respectively, and feed them back to the main control chip. The main control chip can determine whether the power signals and signals under test are abnormal based on the first and second sampled values ​​obtained from the feedback, thereby realizing rapid detection and fault location when the circuit is abnormal, and reducing downtime caused by circuit faults.

[0092] This utility model also proposes an air conditioning system that has the above-mentioned circuit fault location system.

[0093] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A circuit fault location system, comprising a main control chip, characterized in that, It also includes a power detection module and a signal detection module connected to the main control chip; The power detection module is used to sample and acquire power signals, and after voltage division of the power signals, obtain the first sampled value and feed it back to the main control chip. The signal detection module is used to sample and acquire the signal to be tested, and after filtering and amplifying the signal to be tested, obtain a second sample value and feed it back to the main control chip. The main control chip determines whether the power signal and the signal under test are abnormal based on the first sample value and the second sample value.

2. The circuit fault location system according to claim 1, characterized in that, The power detection module includes multiple power sampling circuits and voltage sampling circuits connected to each power sampling circuit in a corresponding manner. The input terminal of each power sampling circuit is connected to the power signal, the output terminal of each power sampling circuit is connected to the input terminal of the voltage sampling circuit, and the output terminal of each voltage sampling circuit is connected to the main control chip.

3. The circuit fault location system according to claim 2, characterized in that, The voltage sampling circuit includes at least one sampling resistor and multiple voltage dividing resistors; All the voltage divider resistors are connected in series between the output terminal of the power sampling circuit and ground. One end of the series connection of all the sampling resistors is connected between any two adjacent voltage divider resistors, and the other end of the series connection of all the sampling resistors is connected to the input terminal of the main control chip.

4. The circuit fault location system according to claim 1, characterized in that, The signal detection module includes multiple signal sampling circuits and current sampling circuits connected to each of the signal sampling circuits in a one-to-one correspondence. The input terminal of each of the signal sampling circuits is connected to the signal to be measured, the output terminal of each of the signal sampling circuits is connected to the input terminal of the current sampling circuit, and the output terminal of each of the current sampling circuits is connected to the main control chip.

5. The circuit fault location system according to claim 4, characterized in that, The current sampling circuit includes an amplifier, a first input resistor, a second input resistor, and a first current-limiting resistor; The first input terminal of the amplifier is connected in series with the first input resistor and then connected to the output terminal of the signal sampling circuit. The second input terminal of the amplifier is connected in series with the second input resistor and then grounded. The output terminal of the amplifier is connected in series with the first current limiting resistor and then connected to the input terminal of the main control chip.

6. The circuit fault location system according to claim 5, characterized in that, The current sampling circuit also includes a filter capacitor, one end of which is connected between the first current limiting resistor and the input terminal of the main control chip, and the other end of the first current limiting resistor is grounded.

7. The circuit fault location system according to claim 1, characterized in that, It also includes a display module connected to the main control chip; The display module has multiple indicator lights, which are used to indicate the sampling status of the power detection module and the signal detection module.

8. The circuit fault location system according to claim 7, characterized in that, The display module includes multiple display circuits, each of which includes at least one indicator light and a second current-limiting resistor connected in series with the indicator light; One end of the indicator light and the second current-limiting resistor are connected in series to the output terminal of the main control chip, and the other end of the indicator light and the second current-limiting resistor are connected to the power supply.

9. The circuit fault location system according to claim 8, characterized in that, The display circuit includes a first indicator light, a second indicator light, and a third indicator light for emitting different light colors; The first indicator light is used to indicate the abnormal position of the power detection module, the second indicator light is used to indicate the abnormal position of the signal detection module, and the third indicator light is used to indicate whether the sampling status of the power detection module and the signal detection module is abnormal.

10. An air conditioning system, characterized in that, The air conditioning system has a circuit fault location system as described in any one of claims 1 to 9.

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