Electric control system capable of positioning communication fault and electric appliance

Abstract

The utility model discloses an electric control system capable of positioning a communication fault and an electric appliance. The electric control system capable of positioning the communication fault comprises at least one working plate provided with a first main control chip and a communication chip, and a detection plate connected with the working plate. A communication signal is transmitted between the first main control chip and the communication chip; the detection board is provided with a detection interface and a current detection circuit; the detection interface is connected between the first main control chip and the communication chip and is used for acquiring the communication signal; the current detection circuit is arranged at the detection interface and is used for detecting the current of the communication signal; and the detection board locates the position of a communication fault according to the current magnitude of the communication signal. Compared with the prior art, the system can accurately locate the root cause of communication faults, namely damage of the main control chip or damage of the communication chip, facilitates after-sales maintenance, can accurately locate fault conditions, improves maintenance efficiency, and reduces maintenance cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the control field of electric control system, especially a kind of electric control system and electric appliance with positionable communication fault. BACKGROUND

[0002] The electric appliance equipment needed in life needs mainboard to control its function operation, and display board shows corresponding parameters and operating state and fault state, and the fault state of display will only show communication fault when display board and mainboard communication is not on;

[0003] But actually there are many reasons for communication fault, one reason is that the communication chip corresponding to communication type is damaged;

[0004] Another is that main control chip is damaged;

[0005] If the cause of communication fault cannot be accurately positioned, after-sales maintenance can only blindly try to replace mainboard or display board, when the cause of communication fault is accurately positioned, unnecessary workload of after-sales maintenance can be reduced and maintenance cost is reduced.

[0006] Therefore, how to design a kind of electric control system and electric appliance with positionable communication fault, accurately position communication fault is main control chip damage or communication chip damage, thereby reducing unnecessary workload of after-sales maintenance, is the technical problem to be solved in the industry. CONTENT OF UTILITY MODEL

[0007] In view of the problem that display only shows communication fault in prior art, and cannot accurately position communication fault, the utility model provides a kind of electric control system and electric appliance with positionable communication fault.

[0008] The technical scheme of the utility model is to provide a kind of electric control system with positionable communication fault, at least one working plate with first main control chip and communication chip is arranged, and detection plate connected with the working plate;

[0009] The first main control chip and the communication chip transmit communication signal, the detection plate has a detection interface connected between the first main control chip and the communication chip for obtaining the communication signal, and current detection circuit is arranged at the detection interface for detecting the current size of the communication signal;

[0010] The detection plate positions the position of communication fault according to the current size of the communication signal.

[0011] Further, it further includes I / O input interface arranged on the working plate and I / O output interface arranged on the detection plate, and the I / O input interface is connected with the I / O output interface to transmit I / O signal;

[0012] The detection board has a second master chip, which provides I / O signals for the I / O output interface when it detects that the working board has communication failure.

[0013] Further, the current detection circuit comprises resistors R1, R2, R3, R4, R5 and an amplifier U1.

[0014] The resistor R1 is connected in series in the output circuit of the detection interface to obtain the communication signal, one end of the resistor R2 is connected to one side of the resistor R1, the other end of the resistor R2 is connected to the inverting input terminal of the amplifier U1, one end of the resistor R3 is connected to the other side of the resistor R1, the other end of the resistor R3 is connected to the non-inverting input terminal of the amplifier U1.

[0015] The resistor R5 is connected in series in the output circuit of the amplifier U1.

[0016] One end of the resistor R4 is connected between the resistor R3 and the non-inverting input terminal of the amplifier U1, and the other end of the resistor R4 is connected between the resistor R5 and the output terminal of the amplifier U1.

[0017] Further, a filter circuit is arranged at the output terminal of the current detection circuit, which comprises a capacitor C1.

[0018] One end of the capacitor C1 is connected to one end of the resistor R5 away from the amplifier U1, and the other end of the capacitor C1 is grounded.

[0019] Further, when the current detected by the current detection circuit is different from the current of the communication signal output by the first master chip, the communication failure is that the master chip is damaged.

[0020] Further, a timer is arranged in the detection board, which is used to capture the interval period of adjacent two rising edges in the communication signal.

[0021] Further, when the reciprocal of the greatest common divisor of all interval periods captured in the timer is consistent with the set baud rate, the communication failure is that the communication chip is damaged.

[0022] Further, the working board is any one of a main board, a display board and a driving board.

[0023] Further, a first indicator light and a second indicator light are arranged in the detection board.

[0024] The first indicator light is used for triggering when the first master control chip is damaged, and the second indicator light is used for triggering when the communication chip is damaged.

[0025] The utility model discloses still proposed a kind of electrical appliances, it has the electric control system of above-mentioned positionable communication failure.

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

[0027] 1, the utility model is provided with detection interface, current detection circuit is simultaneously provided with in detection interface, can be used to detect the current size of communication signal, and according to the current size and the current size of communication signal that first master control chip exports, determine whether communication failure is first master control chip damage;

[0028] Meanwhile, the utility model is provided with timer, is used for capturing the interval period of adjacent two rising edges in communication signal, to determine whether communication failure is communication chip damage;

[0029] Therefore, the utility model can accurately determine that communication failure is caused by first master control chip damage or communication chip damage, and after-sales maintenance can accurately locate fault condition, improve maintenance efficiency, reduce maintenance cost;

[0030] 2, the utility model is provided with I / O output interface on detection board, and I / O input interface is provided on workboard, can provide I / O signal for workboard by detection board, when detecting that communication failure is first master control chip damage, the utility model can provide I / O signal for workboard by first master control chip on detection board, to make workboard normal operation. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be used to the drawing in the embodiment or prior art description briefly introduced, obviously, the drawing in the following description only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying the creativity labor intensity, can also obtain other drawings according to these drawings.

[0032] Figure 1 It is the design block diagram of the utility model as a whole;

[0033] Figure 2 It is the detection schematic diagram of workboard communication failure of the utility model detection board;

[0034] Figure 3 It is the topological schematic diagram of current detection circuit in the utility model. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and embodiments.

[0036] Therefore, one feature indicated in the specification will be used to explain one feature of one embodiment of the utility model, rather than implying that each embodiment of the utility model must have the explained feature. In addition, it should be noted that the specification describes many features. Although certain features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly explained. Therefore, unless otherwise stated, the explained combinations are not intended to be limiting.

[0037] The principles and structures of the utility model will be described in detail below in combination with the drawings and embodiments.

[0038] There are many reasons for communication failure, one of which is that the communication chip corresponding to the communication type is damaged;

[0039] Another is that the main control chip is damaged;

[0040] At present, the display of the electric appliance can only display the existence of communication failure, but it cannot determine whether the communication failure is caused by the damage of the main control chip or the communication chip, so that the after-sales maintenance can only blindly try to replace the mainboard or the display board, and there is a lot of unnecessary workload.

[0041] The utility model gives the design scheme of the electric control system for accurately positioning the communication failure in view of the above problems, one of which is to determine whether the communication failure is caused by the damage of the first main control chip through the detection interface and the current detection circuit arranged at the detection interface;

[0042] The second is to capture the interval between the adjacent two rising edges in the communication signal through the timer, so as to determine whether the communication failure is caused by the damage of the communication chip;

[0043] The utility model can accurately determine whether the communication failure is caused by the damage of the first main control chip or the communication chip through the above scheme, can accurately position the fault condition in after-sales maintenance, improve the maintenance efficiency and reduce the maintenance cost.

[0044] It should be pointed out that, since the communication failure is divided into two kinds of main control chip damage and communication chip damage, therefore, when the communication failure occurs in the working board, the communication failure can be accurately determined through the above first or second scheme. For the first scheme, it can be determined whether the communication failure is caused by the damage of the main control chip, if it is determined that the communication failure is not caused by the damage of the main control chip, it can be determined that the communication failure at this time is caused by the damage of the communication chip;

[0045] Similarly, for the second solution, it can be determined whether the communication fault is a communication chip fault. If it is determined that the communication fault is not a communication chip fault, it can be determined that the communication fault at this time is a main control chip fault;

[0046] That is, both the first solution and the second solution in the present invention can achieve accurate determination of communication failures, and can be used in combination or individually.

[0047] The working principle of the electronic control system capable of locating communication faults in the present invention is described below with reference to the accompanying drawings:

[0048] The electric control system capable of locating communication faults proposed in the present invention includes at least one working board provided with a first main control chip and a communication chip, and a detection board connected to the working board;

[0049] like Figure 1 As shown, the working board referred to in the present invention is any one or more of the main board, display board, and driver board. For an electrical appliance, the main board generally serves as the control part of the electrical appliance, the driver board is used to drive the electrical appliance to perform corresponding actions, and the display board is used to display the working status of the electrical appliance, etc.

[0050] The main board, display board, and driver board all have the first main control chip and communication chip, and the communication failure occurs between the first main control chip and the communication chip;

[0051] The detection board is connected to the main board, display board, and driving board at the same time, and is used to detect whether there is a communication fault in the main board, display board, and driving board, and if there is a communication fault, determine the location of the communication fault.

[0052] Furthermore, in the above-mentioned electronic control system capable of locating communication faults, a communication signal is transmitted between the first main control chip and the communication chip, and the detection board has a detection interface connected between the first main control chip and the communication chip for obtaining the communication signal, and a current detection circuit provided at the detection interface for detecting the current magnitude of the communication signal;

[0053] The detection board locates the position of the communication fault according to the current size of the communication signal.

[0054] See Figure 2 , the left side is the working board, which has the first main control chip and the communication chip inside. Communication signals, namely TX (transmit) signal and RX (collect) signal, are transmitted between the first main control chip and the communication chip;

[0055] Under normal circumstances, the first main control chip communicates normally with the communication chip, and then the communication chip sends a communication signal to control the electrical appliance to perform the corresponding action;

[0056] When the communication fault occurs, the communication chip cannot obtain the communication signal sent by the first master chip, and thus cannot perform corresponding control on the electrical appliance.

[0057] The right side is a detection board, which has a second master chip and a detection interface inside, and the working board also has a corresponding detection interface, which can ensure that the detection board can be connected to the working board through the detection interface, so as to obtain the above-mentioned communication signal.

[0058] From Figure 2 It can be clearly seen that when the working board has a communication fault, the communication signal can be transmitted to the second master chip through the detection interface on the working board and the detection interface on the detection board in turn. Wherein, TX1 and RX1 represent the communication signal transmitted from the Figure 2 It can be seen that the communication signal can enter the detection board smoothly.

[0059] On the way of the detection interface outputting the TX1 signal, a resistance R1 and a current detection circuit are also arranged, and the resistance R1 is used as a sampling resistance and also belongs to the current detection circuit, and the current detection circuit can detect the current size of the TX1 signal, and since the TX1 signal is obtained from the first master chip, it is also a communication signal.

[0060] That is, the current detection circuit in the utility model can detect the current size of the communication signal, and the current size of the communication signal should be the same as the current size of the communication signal output by the first master chip under normal circumstances, otherwise, when the first master chip is damaged, the current size of the communication signal detected by the current detection circuit is different from the current size of the communication signal output by the first master chip.

[0061] Therefore, the utility model can locate the position of the communication fault according to the current size of the communication signal.

[0062] The above-mentioned beneficial effect 1 is realized through the above-mentioned scheme.

[0063] The utility model is provided with a detection interface, and a current detection circuit is arranged at the detection interface, which can be used to detect the current size of the communication signal, and according to the current size and the current size of the communication signal output by the first master chip, whether the communication fault is the damage of the first master chip is determined.

[0064] Further, the utility model further includes an I / O input interface arranged on the working board and an I / O output interface arranged on the detection board, and the I / O input interface and the I / O output interface are connected to transmit I / O signals.

[0065] The detection board has a second master control chip, which provides I / O signals for the I / O output interface when detecting that the working board has communication failure.

[0066] Please refer to Figure 2 , the left side is the working board, and the I / O input interface is arranged on the working board, and the right side is the detection board, and the I / O output interface is arranged on the detection board, and the I / O output interface is arranged on the detection board. Figure 2 It can be seen from the above that the I / O signal can be transmitted between the I / O input interface and the I / O output interface.

[0067] When detecting that there is communication failure, it is often impossible to repair immediately, but at this time, the communication function needs to be executed, and the I / O input interface and the I / O output interface are arranged in the utility model, which can ensure that the corresponding I / O signal is normally provided for the working board when the working board has communication failure, so that the I / O output interface of the second master control chip on the detection board can replace the first master control chip to perform the running function.

[0068] The above-mentioned beneficial effect 2 is realized by the above-mentioned scheme.

[0069] The utility model sets up I / O output interface on the detection board, and sets up I / O input interface on the working board, can provide I / O signal for the working board through the detection board, when detecting that the communication failure is the first master control chip damage, the utility model can use the first master control chip on the detection board to provide I / O signal for the working board, so that the working board normally runs.

[0070] Please refer to Figure 3 , the current detection circuit in the utility model includes: resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, amplifier U1;

[0071] Among them, resistance R1 is connected in series in the output circuit of the detection interface to obtain the communication signal, one end of resistance R2 is connected to one side of resistance R1, the other end of resistance R2 is connected to the inverting input terminal of amplifier U1, one end of resistance R3 is connected to the other side of resistance R1, the other end of resistance R3 is connected to the noninverting input terminal of amplifier U1;

[0072] Resistance R5 is connected in series in the output circuit of amplifier U1;

[0073] One end of resistance R4 is connected between resistance R3 and the noninverting input terminal of amplifier U1, and the other end of resistance R4 is connected between resistance R5 and the output terminal of amplifier U1.

[0074] Its working principle is:

[0075] The resistance R1 is used as a sampling resistance, and since it is connected in series to the output line of the detection interface, according to the working principle of the series circuit, the current at each position in the series circuit is equal, and thus the current on the resistance R1 is equal to the current of the communication signal, and in the utility model, the current on the resistance R1 is only detected, and thus the current of the communication signal can be obtained;

[0076] The amplifier U1, the resistance R2, the resistance R3 and the resistance R4 form an amplification circuit, and the current signal is converted into a voltage signal which is easy to detect, and the purpose of designing the amplification circuit is to facilitate detection, and in many cases, the current of the communication signal is small and cannot be accurately detected, and the utility model can realize the detection of the current of the communication signal by constructing the amplification circuit, amplifying the current signal and outputting the current signal in the form of a voltage.

[0077] The resistance R5 is used as a protection resistance, and the current output from the amplifier U1 is large, and thus the resistance R5 is arranged to avoid damaging the subsequent circuit.

[0078] Please refer to Figure 3 The utility model also comprises a filter circuit arranged at the output end of the current detection circuit, and the filter circuit comprises a capacitor C1.

[0079] One end of the capacitor C1 is connected to one end of the resistance R5 and the amplifier U1, and the other end of the capacitor C1 is grounded.

[0080] Here, the capacitor C1 is used as a filter capacitor and is used for filtering the current signal output from the amplifier U1, so as to avoid the interference of the noise signal.

[0081] Specifically, the principle for determining the damage of the first main control chip by the current detection circuit in the utility model is as follows:

[0082] When the current detected by the current detection circuit is different from the current of the communication signal output from the first main control chip, the communication failure is caused by the damage of the first main control chip.

[0083] Please refer to Figures 2 to 3 The whole process for determining the communication failure by the current detection circuit in the utility model is as follows:

[0084] When the communication between the communication chip and the first main control chip is disconnected, or when the first main control chip and other communication chips have a communication failure, the detection board first detects the current of the TX1 signal.

[0085] The current detection circuit obtains the current of the TX1 signal through a sampling resistor R1, and since the resistance value of the sampling resistor R1 is small, the current signal needs to be amplified by a certain multiple through an amplification circuit and then converted into a voltage signal, the second main control chip of the detection board reads the voltage value of the current detection signal and obtains the current size of the TX signal through calculation, if the TX current size is the same as the current size output by the first main control chip, it can be judged that the first main control chip has output the transceiving signal pair (namely, the TX signal and the RX signal), otherwise, it can be judged that the first main control chip has no output transceiving signal pair, and it can be determined that the communication failure reason is that the first main control chip is damaged.

[0086] Further, the utility model discloses still include setting in detection board's timer, timer is used to capture the interval period of adjacent two rising sides in communication signal.

[0087] Since the timer is a conventional setting, therefore in the drawings of the utility model, has not given the schematic specifically.

[0088] The utility model discloses the logic for determining communication failure based on the above timer is:

[0089] When the reciprocal of the greatest common divisor of all interval periods captured in the timer is consistent with the set baud rate, the communication failure is that the communication chip is damaged.

[0090] Its specific principle is:

[0091] When the first main control chip has output the transceiving signal pair (namely, the TX signal and the RX signal), the second main control chip of the detection board detects the baud rate of the transceiving signal pair (namely, the TX signal and the RX signal) by using the capture function.

[0092] The baud rate detection mode is that the timer opens the capture function, records the time used for opening the function to capture the first rising side of the transceiving signal pair and the interval period of capturing adjacent two rising sides and falling sides.

[0093] Then sort the period data, and the data is in a ladder shape, the first ladder is the duration of one-bit data, the second ladder is the duration of two-bit data, and so on.

[0094] Therefore, the second data is twice the first data, the third data is three times the first data, and the minimum common divisor of these sorted data is calculated to determine whether the reciprocal of the minimum common divisor is consistent with the set baud rate.

[0095] If consistent, it can be explained that the baud rate is correct, and the communication chip needs to be replaced if the baud rate is correct.

[0096] Otherwise, if the baud rate is incorrect, it means that the first main control chip is damaged.

[0097] It realizes the above beneficial effect 1 by the above scheme:

[0098] The utility model discloses a timer is provided for capturing the interval period of adjacent two rising edges in communication signal, thereby determining whether the communication failure is communication chip damage.

[0099] In conclusion, the utility model discloses the setting of current detection circuit and the setting of timer realize the above beneficial effect 1 in:

[0100] The utility model discloses a detection interface is provided with current detection circuit simultaneously at the detection interface, can be used to detect the current size of communication signal, and according to the current size and the current size of the communication signal that the first main control chip exports, determine whether the communication failure is the first main control chip damage;

[0101] Meanwhile, the utility model discloses a timer is provided for capturing the interval period of adjacent two rising edges in communication signal, thereby determining whether the communication failure is communication chip damage.

[0102] Therefore, the utility model can accurately determine that the communication failure is caused by main control chip damage or communication chip damage, which facilitates accurate positioning of the fault condition in after-sales maintenance, improves maintenance efficiency and reduces maintenance cost.

[0103] Please see Figure 1 The utility model discloses a workboard is any one of mainboard, display board and drive board.

[0104] For the communication process of mainboard, display board and drive board, communication is carried out through main control chip and communication chip, so the detection logic of the above-mentioned mainboard, display board and drive board is not different for the detection process of detection board, so the workboard in the utility model can be any one of the above-mentioned mainboard, display board and drive board.

[0105] Please see Figure 1 The utility model discloses a workboard has mainboard, display board and drive board.

[0106] The detection board is connected to the mainboard, display board and drive board simultaneously for judging whether communication failure appears, and determining the position of communication failure when communication failure appears.

[0107] The detection signal is transmitted between the above-mentioned mainboard and detection board, and the detection signal is the communication signal (namely TX signal and RX signal) described above, the detection board compares the current size of the communication signal with the current size of the communication signal output by the first main control chip in the mainboard, and then determines whether the specific communication failure of the mainboard is the first main control chip damage or communication chip damage when communication failure appears.

[0108] In Figure 1 It can be seen that the detection board has one I / O output signal reserved for the main board, which is set to provide I / O signal through the second main control chip on the detection board when it is determined that the communication failure is caused by the damage of the first main control chip, so that the working board can run normally.

[0109] The working logic of the display board is consistent with the main board, and the detection signal is transmitted between the display board and the detection board, which is the communication signal (i.e. TX signal and RX signal) described above. The detection board detects the current size of the communication signal, and then compares it with the current size of the communication signal output by the first main control chip in the display board, so that it can be determined that the specific communication failure of the display board when the communication failure occurs is the damage of the first main control chip or the damage of the communication chip.

[0110] In Figure 1 It can be seen that the detection board has one I / O output signal reserved for the display board, which is set to provide I / O signal through the second main control chip on the detection board when it is determined that the communication failure is caused by the damage of the first main control chip, so that the working board can run normally.

[0111] The working logic of the drive board is consistent with the main board, and the detection signal is transmitted between the drive board and the detection board, which is the communication signal (i.e. TX signal and RX signal) described above. The detection board detects the current size of the communication signal, and then compares it with the current size of the communication signal output by the first main control chip in the drive board, so that it can be determined that the specific communication failure of the drive board when the communication failure occurs is the damage of the first main control chip or the damage of the communication chip.

[0112] In Figure 1 It can be seen that the detection board has one I / O output signal reserved for the drive board, which is set to provide I / O signal through the second main control chip on the detection board when it is determined that the communication failure is caused by the damage of the first main control chip, so that the working board can run normally.

[0113] Further, the first indicator light and the second indicator light are arranged in the detection board.

[0114] The first indicator light is used to trigger when the first main control chip is damaged, and the second indicator light is used to trigger when the communication chip is damaged.

[0115] Please refer to Figure 2 In the utility model, the first indicator light is the main control chip fault indicator light, and the second indicator light is the communication chip fault indicator light.

[0116] The utility model discloses through above-mentioned setting, can be more intuitive to determine that the communication failure is main control chip damage or communication chip damage at this time.

[0117] The utility model discloses still propose a kind of electrical appliances, it has the electrical control system of above-mentioned locatable communication failure.

[0118] Compared with prior art, the utility model at least has following beneficial effects:

[0119] 1, the utility model is provided with detection interface, current detection circuit is simultaneously provided with in detection interface, can be used to detect the current size of communication signal, and according to the current size and the current size of communication signal that first main control chip exports, determine whether communication failure is main control chip damage;

[0120] Meanwhile, the utility model is provided with timer, is used for capturing the interval period of adjacent two rising sides in communication signal, to determine whether communication failure is communication chip damage;

[0121] Therefore, the utility model can accurately determine that communication failure is caused by main control chip damage or communication chip damage, and it is convenient for after-sales maintenance to accurately locate fault condition, improve maintenance efficiency, reduce maintenance cost;

[0122] 2, the utility model is provided with by I / O output interface on detection board, and I / O input interface is simultaneously provided with on workboard, can provide I / O signal for workboard by detection board, when detecting that communication failure is main control chip damage, the utility model can provide I / O signal for workboard by main control chip on detection board, to make workboard normal operation.

[0123] The above-mentioned is only the preferred embodiment of the utility model, and does not use to limit the utility model, and any modification, equivalent replacement and improvement etc. that are made within the spirit and principle of the utility model should be contained in the protection scope of the utility model.

Claims

1. An electronic control system capable of locating communication faults, characterized in that: It includes at least one working board provided with a first main control chip and a communication chip, and a detection board connected to the working board; The first main control chip and the communication chip transmit communication signals, and the detection board has a detection interface connected between the first main control chip and the communication chip for obtaining the communication signal, and a current detection circuit provided at the detection interface for detecting the current size of the communication signal; The detection board locates the position of the communication fault according to the current size of the communication signal.

2. The electronic control system capable of locating communication faults according to claim 1, characterized in that: It also includes an I / O input interface provided on the working board and an I / O output interface provided on the detection board, wherein the I / O input interface is connected to the I / O output interface to transmit I / O signals; The detection board has a second main control chip, and the second main control chip provides an I / O signal to the I / O output interface when detecting that a communication failure occurs in the working board.

3. The electronic control system capable of locating communication faults according to claim 1, characterized in that: The current detection circuit includes: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and an amplifier U1; The resistor R1 is connected in series in the output line of the detection interface to obtain the communication signal, one end of the resistor R2 is connected to one side of the resistor R1, and the other end of the resistor R2 is connected to the inverting input terminal of the amplifier U1, and one end of the resistor R3 is connected to the other side of the resistor R1, and the other end of the resistor R3 is connected to the non-inverting input terminal of the amplifier U1; The resistor R5 is connected in series in the output circuit of the amplifier U1; One end of the resistor R4 is connected between the resistor R3 and the non-inverting input terminal of the amplifier U1 , and the other end of the resistor R4 is connected between the resistor R5 and the output terminal of the amplifier U1 .

4. The electronic control system capable of locating communication faults according to claim 3, characterized in that: It also includes a filter circuit arranged at the output end of the current detection circuit, and the filter circuit includes: a capacitor C1; One end of the capacitor C1 is connected to the end of the resistor R5 away from the amplifier U1 , and the other end of the capacitor C1 is grounded.

5. The electronic control system capable of locating communication faults according to claim 1, characterized in that: When the current detected by the current detection circuit is different from the current of the communication signal output by the first main control chip, the communication fault is caused by damage to the first main control chip.

6. The electronic control system capable of locating communication faults according to claim 1, characterized in that: It also includes a timer arranged in the detection board, and the timer is used to capture the interval period between two adjacent rising edges in the communication signal.

7. The electronic control system capable of locating communication faults according to claim 6, characterized in that: When the reciprocal of the lowest common divisor of all interval periods captured in the timer is consistent with the set baud rate, the communication fault is caused by damage to the communication chip.

8. The electronic control system capable of locating communication faults according to claim 1, characterized in that: The working board is any one of a main board, a display board and a driving board.

9. The electronic control system capable of locating communication faults according to claim 1, characterized in that: Also included are a first indicator light and a second indicator light disposed in the detection board; The first indicator light is used to be triggered when the first main control chip is damaged, and the second indicator light is used to be triggered when the communication chip is damaged.

10. An electrical appliance, characterized in that: The electrical appliance comprises an electrical control system capable of locating communication faults as claimed in any one of claims 1 to 9.

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