CN111693891A - Terminal with communication module and remote diagnosis system - Google Patents

Abstract

The invention discloses a terminal with a communication module and a remote diagnosis system. The terminal includes a communication module, a diagnosis circuit and a control unit; the diagnosis circuit includes first and second switches, a detection resistor, and a module power supply output end; The second switch includes a first end, a second end and a control end respectively; the power supply input end is electrically connected to the first end of the first switch and the first end of the second switch respectively; the second end of the second switch is connected to the detection resistor One end of the first switch is electrically connected; the second end of the first switch and the other end of the detection resistor are electrically connected to the output end of the power supply of the module; the output end of the power supply of the module is used for power supply of the communication module; the control unit is used to collect power when the second switch is turned on The voltage data at both ends of the resistor is detected, and diagnostic data is obtained according to the voltage data; the diagnostic data is used to determine whether there is abnormal leakage of the terminal. The invention can diagnose the health status of the communication modules scattered in the terminal equipment of the client, so as to ensure that the communication function is not affected.

Description

Terminal and remote diagnostic system with communication module

technical field

The invention relates to the field of Internet of Things equipment, in particular to a terminal with a communication module and a remote diagnosis system.

Background technique

IoT devices run outdoors for a long time, and will face various harsh application environments such as extreme heat and cold, extremely high humidity, lightning, static electricity, and unstable voltage. Only the threat of static electricity will cause several damages to electronic devices around the world every year. billions of dollars in losses.

In some key applications, such as the financial field, the reliability of the operation of the communication modules scattered in the terminal devices of the client (such as the Internet of Things terminal) is extremely high, and it is necessary to ensure the absolute smooth communication of each terminal device. In the prior art, the hardware of the communication module in the terminal device cannot be found in time for signs of damage, which eventually leads to abnormal communication function of the terminal device, and cannot meet the reliability requirements of the communication module in some applications.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the inability to detect the signs of damage to the hardware of the communication module in the terminal equipment in time in the prior art, which eventually leads to the abnormal occurrence of the communication function of the terminal equipment, which cannot satisfy the reliability of the communication module in some applications. It provides a system that can diagnose the health status of the communication modules scattered in the terminal equipment of the client, and find the signs of damage to the hardware of the module in time. Once there is hardware damage, the equipment can be repaired and replaced in time to ensure that Terminals with communication modules and remote diagnostic systems where the communication function is not affected.

The present invention solves the above-mentioned technical problems through the following technical solutions:

A first aspect of the present invention provides a terminal with a communication module, including a power supply input end and the communication module, the terminal further includes a diagnosis circuit and a control unit; the control unit is communicatively connected to the communication module;

The diagnostic circuit includes a first switch, a second switch, a detection resistor, and a module power supply output terminal; the first switch and the second switch respectively include a first terminal, a second terminal and a control terminal;

The power supply input end is electrically connected to the first end of the first switch and the first end of the second switch, respectively;

The second end of the second switch is electrically connected to one end of the detection resistor;

The second end of the first switch and the other end of the detection resistor are electrically connected to the output end of the power supply of the module;

The module power supply output terminal is used for power supply of the communication module;

the control unit is used for outputting a first switch signal to the control terminal of the first switch to control the on and off of the first switch;

The control unit is further configured to output a second switch signal to the control terminal of the second switch to control the on and off of the second switch;

The control unit is further configured to collect voltage data across the detection resistor when the second switch is turned on, and obtain diagnostic data according to the voltage data;

The diagnostic data is used to determine whether the terminal has abnormal leakage current.

In this solution, the diagnostic circuit is composed of two switching devices, namely a first switch and a second switch. The control unit generates control signals for the two switches to control the on and off of the corresponding switches. When the second switch is turned on and the second switch is turned off, the power input from the power supply input end is output to the module power supply output end through the first switch to supply power for the communication module; when the second switch is turned on and the first switch is turned off, the power supply The power input at the input end passes through the second switch and the detection resistor in turn and is output to the output end of the module power supply to supply power for the communication module. At this time, the control unit collects the voltage data at both ends of the detection resistor, and obtains diagnostic data according to the voltage data, and further Through the diagnostic data, it can be determined whether the terminal has abnormal leakage current.

Through the setting of the diagnostic circuit including the two-way switching device, this solution can diagnose the health status of the communication module in the terminal equipment, and timely find the signs of damage to the hardware of the module. Repair and replace the equipment to ensure that the communication function is not affected.

Preferably, the first switch is an NMOS (N-type metal-oxide-semiconductor) transistor, the second switch is a PMOS (P-type metal-oxide-semiconductor) transistor, and the terminal further includes a first resistor and a second resistor; the first resistor is connected in series between the first end and the control end of the first switch; the second resistor is connected in series between the first end and the control end of the second switch ;

The gate of the NMOS transistor is the control terminal of the first switch, the drain of the NMOS transistor is the first terminal of the first switch, and the source of the NMOS transistor is the second terminal of the first switch;

The gate of the PMOS transistor is the control terminal of the second switch, the source of the PMOS transistor is the first terminal of the second switch, and the drain of the PMOS transistor is the second terminal of the second switch.

Preferably, the resistance value of the detection resistor is less than 0.05 ohm, and the accuracy of the detection resistor is greater than or equal to 1%.

Preferably, the control unit is further configured to calculate the current value on the detection resistor according to the voltage data, and use the current value and the working mode information of the terminal as the diagnostic data;

The communication module is used for sending the diagnostic data to the remote monitoring terminal;

The remote monitoring terminal determines whether the terminal has abnormal leakage based on the diagnostic data

In this solution, a high-precision and high-power current detection resistor is used to calculate the working current value of the terminal in each working mode. The specific resistance value is less than 0.05 ohm and the accuracy is greater than or equal to 1%. The detection resistor set in this way can identify the hardware of the module. When signs of damage appear, it is better to diagnose the health status of the communication module in the terminal device.

Preferably, the control unit is further configured to receive a control instruction sent by the remote monitoring terminal via the communication module, and generate the first switch signal and the second switch signal according to the control instruction.

Preferably, the terminal is an IoT terminal, and the communication module is a communication module.

A second aspect of the present invention provides a remote diagnosis system, comprising a remote monitoring terminal and a terminal with a communication module as described in the first aspect; the remote monitoring terminal and the communication module of the terminal are communicated and connected via a wireless network;

The remote monitoring terminal is used to send control instructions to the communication module of the terminal, and the communication module is used to transmit the control instructions to the control unit; the control instructions include diagnostic instructions and work instructions;

When the control command is the diagnosis command, the control unit is configured to output a first switch signal to the control terminal of the first switch to control the first switch to be turned off, and the control unit is further configured to output The second switch signal is sent to the control end of the second switch to control the second switch to be turned on; when the control command is the work command, the control unit is used to output the first switch signal to the first switch A control terminal of a switch is used to control the first switch to be turned on, and the control unit is further used to output a second switch signal to the control terminal of the second switch to control the second switch to be turned off;

The communication module is also used for sending the diagnostic data to the remote monitoring terminal;

The remote monitoring terminal is configured to determine whether the terminal has abnormal leakage based on the diagnostic data.

In this solution, the terminal is in the normal working mode by default. At this time, the first switch is turned on and the second switch is turned off, which can be realized by the remote monitoring terminal sending work instructions to the communication module of the terminal. When it is necessary to diagnose the health status of the communication module in the terminal equipment, the remote monitoring terminal sends a diagnosis instruction to the communication module of the terminal, and the control unit outputs the corresponding first switch signal and second switch signal after receiving the diagnosis instruction to make the The first switch is turned off and the second switch is turned on. At this time, the control unit collects the voltage data at both ends of the detection resistor, and obtains diagnostic data according to the voltage data. The communication module transmits the diagnostic data to the remote monitoring terminal, and the remote monitoring The terminal judges whether the terminal has abnormal leakage according to the diagnostic data.

Preferably, the remote monitoring terminal is further configured to send a working mode command to a communication module of the terminal, and the communication module is further configured to transmit the working mode command to the control unit;

The control unit is further configured to set the terminal to be in a corresponding working mode according to the working mode instruction;

The remote monitoring terminal is further configured to compare the diagnostic data with the standard data corresponding to the working mode, and judge whether the terminal has abnormal leakage according to the comparison result.

This solution can realize refined diagnosis for terminals including multiple working modes, and realize the setting of terminal working modes by sending working mode commands from the remote monitoring terminal. The obtained diagnostic data is compared with the standard data corresponding to the working mode corresponding to the diagnostic data, so as to determine whether there is abnormal leakage of electricity when the terminal works in the corresponding working mode.

Preferably, the control unit is further configured to calculate the current value on the detection resistor according to the voltage data, and use the current value and the working mode of the terminal as the diagnostic data.

In this solution, the diagnostic data is specifically limited to the current value and the working mode of the terminal, wherein the current value is obtained by dividing the voltage data by the resistance value of the detection resistor. In this solution, the remote monitoring terminal is realized by comparing the difference between the current value and the standard current value when judging whether the terminal has abnormal leakage. The standard current value can be pre-stored in the database, and different working modes correspond to different standard current values. The remote monitoring terminal searches the database for the corresponding standard current value according to the working mode corresponding to the received current value to complete the subsequent comparison.

Preferably, the determining whether the terminal has abnormal leakage current according to the comparison result is: when the current value exceeds 10% of the standard current value corresponding to the working mode, the terminal has abnormal leakage current.

In this solution, after the remote monitoring terminal obtains the diagnostic data, it is compared with the standard current value in the database. If the current consumption value is obviously too large, it is determined that the terminal has a certain abnormal leakage current. Significantly larger means more than 10% of the standard current value.

The positive improvement effect of the present invention is that the terminal with communication module and the remote diagnosis system provided by the present invention can diagnose the health status of the communication modules scattered in the terminal equipment of the client, and find out signs of damage to the hardware of the module in time. If the hardware is damaged, further measures can be taken, such as repairing and replacing the equipment in time, so as to ensure that the communication function is not affected.

Description of drawings

FIG. 1 is a schematic structural diagram of a terminal with a communication module according to Embodiment 1 of the present invention.

FIG. 2 is a schematic circuit diagram of a diagnostic circuit of a terminal with a communication module according to Embodiment 1 of the present invention.

FIG. 3 is a schematic structural diagram of a remote diagnosis system according to Embodiment 2 of the present invention.

FIG. 4 is a working sequence diagram of the diagnosis circuit of the remote diagnosis system according to Embodiment 2 of the present invention.

Detailed ways

The present invention is further described below by way of examples, but the present invention is not limited to the scope of the described examples.

Example 1

As shown in FIG. 1 , this embodiment provides a terminal 1 with a communication module, including a communication module 11 , a diagnosis circuit 13 and a control unit 12 , wherein the diagnosis circuit 13 is shown in FIG. 2 . The control unit 12 is connected in communication with the communication module 11 . The terminal 1 also includes a power supply input terminal VCC. In this embodiment, the terminal 1 is an IoT terminal, and the communication module 11 is a communication module of the IoT terminal.

In this embodiment, the diagnosis circuit 13 includes a first switch A, a second switch B, a first resistor R1, a second resistor R2, a third resistor R3, a detection resistor R4, a module power supply output terminal VBAT, and a first voltage detection terminal ADC1, a second voltage detection terminal ADC2, a first control terminal DIAGNOSE_CTRL_A and a second control terminal DIAGNOSE_CTRL_B. The first switch A and the second switch B respectively include a first terminal, a second terminal and a control terminal; the first switch A is an NMOS transistor, the second switch B is a PMOS transistor, and the gate G of the NMOS transistor is the gate of the first switch A. The control terminal, the drain D of the NMOS transistor is the first terminal of the first switch A, and the source S of the NMOS transistor is the second terminal of the first switch A. The gate G of the PMOS transistor is the control terminal of the second switch B, the source S of the PMOS transistor is the first terminal of the second switch B, and the drain D of the PMOS transistor is the second terminal of the second switch B. The first resistor R1 is connected in series between the first end and the control end of the first switch A, with a resistance value of 470KR (kiloohm); the second resistor R2 is connected in series between the first end and the control end of the second switch B , the resistance value is 470KR; the third resistor R3 is a 0R resistor, which is connected in series between the other end of the detection resistor R4 and the second voltage detection end ADC2.

The power supply input terminal VCC is electrically connected to the first terminal of the first switch A and the first terminal of the second switch B, respectively. The second end of the second switch B is electrically connected to one end of the detection resistor R4; the second end of the first switch A and the other end of the detection resistor R4 are electrically connected to the module power supply output terminal VBAT; the module power supply output terminal VBAT is used for Power supply of the communication module 11 .

The control unit 12 is used for outputting a signal for switching the control circuit to the diagnosis circuit 13, so as to control the diagnosis circuit 13 to switch to the diagnosis mode or the normal operation mode. Specifically, the control unit 12 is configured to receive the control command sent by the remote monitoring terminal via the communication module 11, generate a first switch signal and a second switch signal according to the control command, and output the first switch signal to the first switch signal through the first control terminal DIAGNOSE_CTRL_A The control terminal of switch A is used to control the on and off of the first switch A; the control unit 12 is also used to output the second switch signal to the control terminal of the second switch B through the second control terminal DIAGNOSE_CTRL_B to control the On and off. In addition, the control unit 12 is further configured to perform voltage sampling when the second switch B is turned on, specifically collecting the voltage data across the detection resistor R4, and obtaining diagnostic data according to the voltage data; specifically, collecting the voltage data through the first voltage detection terminal ADC1 The first voltage value at one end of the resistor R4 is detected, and the second voltage value at the other end of the detection resistor R4 is collected through the second voltage detection terminal ADC2, and the first voltage value and the second voltage value are used as voltage data. The diagnostic data is used to determine whether the terminal 1 has abnormal leakage current. The specific judgment method is as follows: the control unit 12 calculates the current value on the detection resistor R4 according to the voltage data, and uses the current value and the working mode information of the terminal 1 as the diagnosis data; the communication module 11 is used for sending the diagnosis data to the remote monitoring terminal, The remote monitoring terminal determines whether the terminal 1 has abnormal leakage based on the diagnostic data.

The resistance value of the detection resistor R4 is less than 0.05 ohm, and the accuracy is greater than or equal to 1%. In this embodiment, the resistance value of the detection resistor R4 is 0.01R, the accuracy is 1%, and the power is 1W (watt). In this embodiment, a high-precision and high-power current detection resistor R4 is used to calculate the working current value of the terminal in each working mode. The detection resistor R4 set in this way can identify the signs of damage to the hardware of the module and better realize the detection of the terminal. Health status diagnosis of the communication module 11 in the device.

In this embodiment, the diagnosis circuit 13 is composed of two switch devices, namely a first switch A and a second switch B, and the control unit 12 generates control signals for the two switches to control the on and off of the corresponding switches , when the first switch A is turned on and the second switch B is turned off, the power input from the power supply input terminal VCC is output to the module power supply output terminal VBAT through the first switch A to supply power for the communication module 11; when the second switch B is connected When the first switch A is turned off at the same time, the power input from the power supply input terminal VCC passes through the second switch B and the detection resistor R4 and then is output to the module power supply output terminal VBAT to supply power to the communication module 11. At this time, the control unit 12 collects The voltage data at both ends of the resistor R4 is detected, and diagnostic data is obtained according to the voltage data, and further through the diagnostic data, it can be determined whether the terminal 1 has abnormal leakage current.

In this embodiment, through the setting of the diagnostic circuit 13 including the two-way switching device, the health status of the communication module 11 in the terminal device can be diagnosed, and the hardware of the module can be found to show signs of damage in time. Once the hardware is damaged, further measures can be taken. , such as timely maintenance and replacement of equipment, so as to ensure that the communication function is not affected.

Example 2

As shown in FIG. 3 , this embodiment provides a remote diagnosis system, including a remote monitoring terminal 2 and a terminal 1 with a communication module in Embodiment 1; the remote monitoring terminal 2 and the communication module 11 of the terminal 1 via a wireless network communication connection.

In this embodiment, the remote monitoring terminal 2 is used for sending control instructions to the communication module 11 of the terminal 1, and the communication module 11 is used for transmitting the control instructions to the control unit 12; the control instructions include diagnostic instructions and work instructions. When the control command is a diagnostic command, the control unit 12 is configured to output a first switch signal to the control terminal of the first switch to control the first switch to be turned off, and output a second switch signal to the control terminal of the second switch to control the second switch Turn on; when the control command is a work command, the control unit 12 is used to output the first switch signal to the control end of the first switch to control the first switch to be turned on, and output the second switch signal to the control end of the second switch to control The second switch is off.

In this embodiment, the remote monitoring terminal 2 is also used to send the working mode instruction to the communication module 11 of the terminal 1, and the communication module 11 is also used to transmit the working mode instruction to the control unit 12; Set Terminal 1 to be in the corresponding working mode.

In this embodiment, when the control command is a diagnostic command, the control unit 12 is further configured to calculate the current value on the detection resistor according to the acquired voltage data at both ends of the detection resistor, and use the current value and the working mode of the terminal 1 as Diagnostic data. The communication module 11 is used for sending diagnostic data to the remote monitoring terminal 2; the remote monitoring terminal 2 is used for judging whether the terminal 1 has abnormal leakage based on the diagnostic data. Specifically, the remote monitoring terminal 2 is used to compare the diagnostic data with the standard data corresponding to the working mode. When the current value exceeds 10% of the standard current value corresponding to the working mode, the terminal 1 has abnormal leakage current.

The working principle of the remote diagnosis system of this embodiment is described in more detail below, so as to better understand the present invention.

1. When the terminal 1 works normally, the first switch A is on, the second switch B is off, and the power supply input terminal VCC is supplied to the module power supply output terminal VBAT of the communication module 11 through the NMOS transistor.

2. The remote monitoring terminal 2 sends a diagnosis command to the terminal 1 to start the diagnosis circuit 13. The control unit 12 switches the level states of DIAGNOSE_CTRL_A and DIAGNOSE_CTRL_B to turn off the first switch A and turn on the second switch B. The specific timing is shown in the diagram. 4. The first is the switching buffer state in which the first switch A and the second switch B are turned on at the same time, and then the first switch A is turned off and the second switch B is turned on, and the diagnostic circuit 13 starts to work.

3. The remote monitoring terminal 2 sends a working mode instruction to the terminal 1, so that the terminal 1 enters the working mode 1. At this time, the control unit 12 samples the voltage value across the detection resistor R4 through the first voltage detection terminal ADC1 and the second voltage detection terminal ADC2, are V1 and V2, respectively.

4. After the control unit 12 obtains the two voltage values, the working current I1 of the terminal 1 in the working mode 1 is calculated by the formula I1=(V1-V2)/R4.

5. If you want to test data in multiple modes, you can repeat the above steps 3 and 4, and you can get the working currents I2 and I3 of the terminal 1 in various modes such as working mode 2, working mode 3, ..., working mode n, etc. respectively. , ...In, where n is a positive integer.

6. The communication module 11 of the terminal 1 sends the working mode information and the corresponding working current information to the remote monitoring terminal 2 .

7. After obtaining the data, the remote monitoring terminal 2 can send a work instruction to the terminal 1, so that the terminal enters a normal working state. At this time, the first switch A is turned on and the second switch B is turned off. The remote monitoring terminal 2 compares the obtained working current with the standard current value in the database. If the current consumption value is obviously too large, it is determined that there is a certain abnormal leakage current in the terminal 1 .

8. The remote monitoring terminal 2 can also notify the customer to repair and replace the equipment whose hardware is at risk.

In this embodiment, the terminal 1 is in the normal working mode by default, and the first switch A is turned on and the second switch B is turned off. When it is necessary to diagnose the health status of the communication module 11 in the terminal device, the remote monitoring terminal 2 sends a diagnosis command to the communication module 11 of the terminal 1, and the control unit 12 outputs the corresponding first switch signal and the first switch signal after receiving the diagnosis command. Two switch signals are used to turn off the first switch A and turn on the second switch B. At this time, the control unit 12 collects the voltage data across the detection resistor and obtains diagnostic data according to the voltage data, and the communication module transmits the diagnostic data. To the remote monitoring terminal 2, the remote monitoring terminal 2 determines whether the terminal 1 has abnormal leakage according to the diagnostic data.

This embodiment can implement refined diagnosis for the terminal 1 including multiple working modes. The remote monitoring terminal 2 sends a working mode command to realize the setting of the working mode of the terminal 1, and the diagnosis data is collected for the terminal 1 in different working modes. The remote monitoring terminal 2 compares the received diagnostic data with the standard data corresponding to the working mode corresponding to the diagnostic data, so as to determine whether there is abnormal leakage of electricity when the terminal 2 works in the corresponding working mode.

In this embodiment, the diagnostic data is specifically limited to the current value and the working mode in which the terminal 2 is located, wherein the current value is obtained by dividing the voltage data by the resistance value of the detection resistor. In this embodiment, the remote monitoring terminal 2 determines whether the terminal 1 has abnormal leakage by comparing the difference between the current value and the standard current value. The standard current value can be pre-stored in the database, and different working modes correspond to different standard current values. The remote monitoring terminal 2 searches the database for the corresponding standard current value according to the working mode corresponding to the received current value to complete the subsequent comparison.

The remote diagnosis system provided in this embodiment can diagnose the health status of the communication modules 11 scattered in the terminal equipment of the client, and find out signs of damage to the hardware of the modules in time. The equipment is repaired and replaced to ensure that the communication function is not affected.

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that this is only an illustration, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (10)

1. A terminal with a communication module comprises a power supply input end and the communication module, and is characterized by further comprising a diagnosis circuit and a control unit; the control unit is in communication connection with the communication module;

the diagnosis circuit comprises a first switch, a second switch, a detection resistor and a module power supply output end; the first switch and the second switch respectively comprise a first end, a second end and a control end;

the input end of the power supply is electrically connected with the first end of the first switch and the first end of the second switch respectively;

the second end of the second switch is electrically connected with one end of the detection resistor;

the second end of the first switch and the other end of the detection resistor are electrically connected with the output end of the module power supply;

the module power supply output end is used for supplying power to the communication module;

the control unit is used for outputting a first switch signal to the control end of the first switch so as to control the on and off of the first switch;

the control unit is further used for outputting a second switch signal to the control end of the second switch so as to control the second switch to be switched on and off;

the control unit is also used for collecting voltage data at two ends of the detection resistor when the second switch is switched on and obtaining diagnosis data according to the voltage data;

the diagnostic data is used for judging whether the terminal has abnormal electric leakage or not.

2. The terminal with the communication module of claim 1, wherein the first switch is an NMOS transistor and the second switch is a PMOS transistor, the terminal further comprising a first resistor and a second resistor; the first resistor is connected between the first end and the control end of the first switch in series; the second resistor is connected between the first end and the control end of the second switch in series;

the grid electrode of the NMOS tube is the control end of the first switch, the drain electrode of the NMOS tube is the first end of the first switch, and the source electrode of the NMOS tube is the second end of the first switch;

the grid electrode of the PMOS tube is the control end of the second switch, the source electrode of the PMOS tube is the first end of the second switch, and the drain electrode of the PMOS tube is the second end of the second switch.

3. The terminal with the communication module of claim 1, wherein the resistance of the sensing resistor is less than 0.05 ohms and the accuracy of the sensing resistor is greater than or equal to 1%.

4. The terminal with the communication module according to claim 3, wherein the control unit is further configured to calculate a current value on the detection resistor according to the voltage data, and use the current value and the operation mode information of the terminal as the diagnostic data;

the communication module is used for sending the diagnosis data to a remote monitoring end;

and the remote monitoring terminal judges whether the terminal has abnormal electric leakage or not based on the diagnosis data.

5. The terminal with the communication module according to claim 4, wherein the control unit is further configured to receive a control command sent by the remote monitoring terminal through the communication module, and generate the first switching signal and the second switching signal according to the control command.

6. The terminal with the communication module according to claim 1, wherein the terminal is an internet of things terminal, and the communication module is a communication module.

7. A remote diagnosis system comprising a remote monitoring terminal and a terminal with a communication module according to any one of claims 1 to 6; the remote monitoring terminal is in communication connection with the communication module of the terminal through a wireless network;

the remote monitoring terminal is used for sending a control instruction to a communication module of the terminal, and the communication module is used for transmitting the control instruction to the control unit; the control instruction comprises a diagnosis instruction and a working instruction;

when the control instruction is the diagnosis instruction, the control unit is used for outputting a first switch signal to the control end of the first switch to control the first switch to be switched off, and is also used for outputting a second switch signal to the control end of the second switch to control the second switch to be switched on; when the control instruction is the working instruction, the control unit is used for outputting a first switch signal to the control end of the first switch to control the first switch to be switched on, and is also used for outputting a second switch signal to the control end of the second switch to control the second switch to be switched off;

the communication module is also used for sending the diagnosis data to the remote monitoring terminal;

and the remote monitoring terminal is used for judging whether the terminal has abnormal electric leakage or not based on the diagnosis data.

8. The remote diagnostic system of claim 7, wherein the remote monitoring terminal is further configured to send an operation mode command to the communication module of the terminal, and the communication module is further configured to transmit the operation mode command to the control unit;

the control unit is also used for setting the terminal to be in a corresponding working mode according to the working mode instruction;

and the remote monitoring end is also used for comparing the diagnostic data with the standard data corresponding to the working mode and judging whether the terminal has abnormal electric leakage according to the comparison result.

9. The remote diagnostic system of claim 8, wherein the control unit is further configured to calculate a current value across the detection resistor according to the voltage data, and use the current value and an operation mode of the terminal as the diagnostic data.

10. The remote diagnosis system according to claim 9, wherein said determining whether the terminal has abnormal electrical leakage according to the result of the comparison is: and when the current value exceeds 10% of the standard current value corresponding to the working mode, the terminal has abnormal electric leakage.

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