Telemetering terminal with power supply monitoring protection and power failure determination method

Abstract

The application relates to the technical field of monitoring, and discloses a telemetry terminal machine with power supply monitoring protection, which comprises a switching switch matrix, the switching switch matrix has multiple power supply input ends and multiple power supply output ends, and the power supply output ends are used for connecting loads; a collection end of a monitoring circuit is connected to a corresponding power supply input end, is used for monitoring current values of each load, and automatically cuts off the power supply of the power supply input end; a main controller is used for controlling the on-off of the switching switch matrix and receiving the collected current values of the monitoring circuit. Each sensor is independently powered, the monitoring circuit can monitor the current of each load in real time, when one of the sensors is damaged to cause a short circuit or an open circuit, the problem point can be immediately judged, the power supply of the sensor is cut off, the remaining sensors can normally work, and the RTU is not damaged due to the short circuit; and the reliability and the economy of the RTU can be greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of monitoring, in particular to a telemetry terminal machine with power supply monitoring protection and a power failure judgment method. BACKGROUND

[0002] The telemetry terminal machine (RTU) is mainly applied to river channels, pumping stations, reservoirs, mountain flood early warning, hydrological stations and the like, and is used for monitoring environmental parameters such as water level, rainfall (snow) amount, flow, flow rate, evaporation amount, silt, ice, soil moisture, water quality and the like.

[0003] In addition to uploading sensor data to a data center, the telemetry terminal machine also needs to provide power supply for each sensor. At present, all sensors are connected to one or two ends. When one of the sensors is damaged and causes a power supply short circuit, all other sensors cannot be used, and even the power supply line of the telemetry terminal machine is burned out. In addition, when the connected sensor is disconnected and has no data, it is also difficult to quickly determine whether the sensor or the telemetry terminal machine is faulty. SUMMARY

[0004] The purpose of the present application is to provide a telemetry terminal machine with power supply monitoring protection and a power failure judgment method, which solves the problem that the existing telemetry terminal machine cannot simultaneously monitor multiple power supplies.

[0005] To achieve the above-mentioned purpose of the application, the technical solution adopted by the present application is: a telemetry terminal machine with power supply monitoring protection, comprising a main controller, a multiple monitoring circuit and a switching switch matrix.

[0006] The switching switch matrix has a multiple power supply input end and a multiple power supply output end, and the power supply output end is used for connecting a load.

[0007] The collection end of each monitoring circuit is connected to a corresponding power supply input end, which is used for monitoring the current value of each load, and automatically cutting off the power supply of the power supply input end of the switching switch matrix according to the abnormality of the current value;

[0008] The main controller is used for controlling the on-off of the switching switch matrix, receiving the current value collected by the monitoring circuit, and controlling the monitoring circuit to turn on the power supply of the power supply input end again after cutting off the power supply.

[0009] Preferably, the monitoring circuit comprises a current collection module and an over-limit self-locking module, the over-limit self-locking module comprises a comparison unit, an H bridge, a relay K201, a pulse unit, the normally closed switch of the relay K201 is connected in series between the power supply input end and the power supply, the first control end of the relay K201 is connected with the first output end of the H bridge, and the second control end of the relay K201 is connected with the second output end of the H bridge.

[0010] The acquisition end of the current acquisition module is connected between the power input end and the relay K201, the output end of the current acquisition module is connected with the first input end of the comparison unit, the second input end of the comparison unit is connected with the host computer, and the output end of the comparator is connected with the second input end of the H bridge;

[0011] The first input end of the H bridge is connected with the pulse unit.

[0012] Preferably, the output end of the comparison unit is connected with the DC blocking coupling circuit, and the output end of the DC blocking coupling circuit is connected with the second input end of the H bridge;

[0013] The comparison unit comprises a hysteresis comparator U202A, a resistor R203 and a resistor R204.

[0014] One pin of the resistor R203 is connected with the output end of the current acquisition module, two pins of the resistor R203 are respectively connected with one pin of the resistor R204 and the comparison end of the hysteresis comparator U202A, two pins of the resistor R204 are connected with the output end of the hysteresis comparator U202A, and the reference end of the hysteresis comparator U202A is connected with the host computer.

[0015] The DC blocking coupling circuit comprises a resistor R205 and a capacitor C202, one pin of the resistor R205 is respectively connected with one pin of the capacitor C202 and the second input end of the H bridge, two pins of the capacitor C202 are connected with the output end of the hysteresis comparator U202A, and two pins of the resistor R205 are grounded.

[0016] Preferably, the current acquisition module comprises a sampling resistor R202, an isolation chip U201, a resistor R201 and a capacitor C201, the sampling resistor R202 is connected in series between the power input end and the relay K201, two input ends of the isolation chip U201 are respectively connected with two pins of the resistor R202, the output end of the isolation chip U201 is respectively connected with one pin of the resistor R201, one pin of the capacitor C201 and one pin of the resistor R203, and two pins of the resistor R201 and two pins of the capacitor C201 are grounded.

[0017] Preferably, the switch matrix comprises a plurality of switch units and a decoder arranged in an array, one end of all switch units in the same column is connected together, the other end of all switch units in the same row is connected together, the control end of each switch unit is connected with the output end of the decoder, and the input end of the decoder is connected with the host computer.

[0018] Preferably, each switch unit comprises a transistor Q101 and a transistor Q102, and the D pole and the S pole of the transistor Q102 are respectively two ends of the switch unit.

[0019] The D pole of the triode Q102 is connected with one foot of the resistor R101, the G pole of the triode Q102 is connected with two feet of the resistor R101 and the D pole of the triode Q101 respectively;

[0020] The G pole of the triode Q101 is connected with the output end of the decoder, and the S pole of the triode Q101 is grounded.

[0021] A power failure judgment method of a telemetry terminal, comprising the following judgment methods:

[0022] Short circuit judgment: the monitoring circuit is used to monitor the current value in real time, and when a short circuit occurs, the short circuit type is distinguished, and the short circuit type includes one of load short circuit, power line short circuit and short circuit misjudgment;

[0023] Break judgment: the monitoring circuit is used to monitor the current value in real time, and when a break occurs, the break type is distinguished, and the break type includes one of load short circuit and power line break.

[0024] The short circuit judgment comprises the following steps:

[0025] S11, the multi-path monitoring circuit acquires multi-path load current information respectively, and judges whether each path of load current is abnormal;

[0026] S12, when one or more paths of load current are too large and abnormal, the monitoring circuit automatically cuts off the power input of the abnormal path of load;

[0027] S13, the monitoring circuit receives the delay unlocking signal of the main controller, and according to the delay unlocking signal, the abnormal path of load is connected to the power supply again, and if the short circuit does not occur again, it is a false trigger;

[0028] S14, if the short circuit occurs again, steps S12-S13 are repeated;

[0029] S15, if the abnormal path of load is still in the short circuit state, the main controller controls the switching switch matrix to switch the power supply channel of the abnormal path of load;

[0030] S16, after the power supply channel is switched, if the abnormal path of load remains in the short circuit state, the load is in the short circuit abnormal state, and if the short circuit state of the abnormal path of load is eliminated, the line of the power supply channel before switching is short-circuited.

[0031] The break judgment comprises the following steps:

[0032] S21, the multi-path monitoring circuit acquires multi-path load current information respectively, and judges whether each path of load current is abnormal;

[0033] S22, when one or more paths of load current are too small and abnormal, the main controller controls the switching switch matrix to switch the power supply channel of the abnormal load;

[0034] S23, if the load current remains in an abnormal state, a short circuit occurs in the load; if the abnormal state of the load current is eliminated, the line circuit of the power supply channel before switching is tripped.

[0035] Further comprising a circuit early warning step:

[0036] S31, the real-time current value obtained by the monitoring circuit is sent to the host controller for storage, and the host controller fits the historical data of the current into a prediction curve;

[0037] S32, when the current test current value deviates from the prediction curve, the host controller sends an early warning message.

[0038] The beneficial effects of the present application are concentrated in:

[0039] 1, the power supply of each sensor load of the present application is independent, each load has a monitoring circuit, the monitoring circuit can monitor the current of each load in real time, when one of the sensors is damaged and causes a short circuit or a circuit break, the problem can be immediately determined, and the power supply of the sensor is cut off, while the remaining sensors can work normally, and the RTU will not be damaged due to short circuit; can greatly improve the reliability and economy of RTU.

[0040] 2, the telemetry terminal of the present application can accurately determine whether the sensor or the telemetry terminal is faulty; when the power supply line fails, but the sensor is not faulty, the power supply line is switched by the switching matrix, which can ensure the normal work of the sensor. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is the overall structure block diagram of the power supply of the telemetry terminal of the present application;

[0042] Figure 2 is the principle diagram of the monitoring circuit of the present application;

[0043] Figure 3 is the circuit block diagram of the switching matrix of the present application;

[0044] Figure 4 is the principle diagram of the switching unit of the present application;

[0045] Figure 5 is the short circuit judgment flow chart of the present application;

[0046] Figure 6 is the short circuit judgment flow chart of the present application. DETAILED DESCRIPTION

[0047] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0048] As Figure 1 shown, a telemetry terminal with power supply monitoring protection includes a master controller, a plurality of monitoring circuits and a switching switch matrix;

[0049] The switching switch matrix has a plurality of power supply input terminals and a plurality of power supply output terminals, and the power supply output terminals are used to connect loads, for example, a four-way load, and if the load is a sensor, the switching switch matrix has at least four power supply output terminals, and the number of power supply input terminals is at least four, and the number of power supply input terminals can be 1-3 more than the number of power supply output terminals, and the excess power supply input terminals can be used as backup power supply input terminals;

[0050] The collection end of each monitoring circuit is connected to a corresponding power supply input terminal, which is used to monitor the current value of each load, and automatically cuts off the power supply of the power supply input terminal of the switching switch matrix of the abnormal path according to the abnormality of the current value; that is, when one or more sensors are damaged and cause short circuit or open circuit, the problem can be immediately determined, and the power supply of the sensor can be cut off, and the sensor can work normally, and at the same time, the RTU will not be damaged due to short circuit; can greatly improve the reliability and economy of the RTU; secondly, the telemetry terminal can accurately determine whether the sensor fails or the telemetry terminal fails; when the power supply line fails and the sensor does not fail, the power supply line can be switched by the switching switch matrix to ensure the normal work of the sensor;

[0051] The master controller is used to control the on-off of the switching switch matrix, receive the current value collected by the monitoring circuit, and control the monitoring circuit to control the power supply input terminal after cutting off the power supply to turn on the power supply again; the master controller can use an STM32 series MCU, and also has other functional modules, such as a storage module, a communication module and a human-computer interaction module.

[0052] Further, as Figure 2 shown, the monitoring circuit includes a current collection module and an over-limit self-locking module, the over-limit self-locking module includes a comparison unit, an H-bridge, a relay K201, and a pulse unit, the normally closed switch of the relay K201 is connected in series between the power supply input terminal and the power supply, the first control end of the relay K201 is connected to the first output end of the H-bridge, and the second control end of the relay K201 is connected to the second output end of the H-bridge; in this embodiment, the pulse unit can use a separate pulse generating element device, or the master controller can directly generate a pulse.

[0053] The relay K201 is a bistable relay K201, the collection end of the current collection module is connected between the power input end and the relay K201, the output end of the current collection module is connected with the first input end of the comparison unit, the second input end of the comparison unit is connected with the host computer, and the output end of the comparator is connected with the second input end of the H bridge.

[0054] The output end of the comparison unit is connected with the direct current isolation coupling circuit, and the output end of the direct current isolation coupling circuit is connected with the second input end of the H bridge.

[0055] The comparison unit comprises a hysteresis comparator U202A, a resistor R203 and a resistor R204, one pin of the resistor R203 is connected with the output end of the current collection module, two pins of the resistor R203 are respectively connected with one pin of the resistor R204 and the comparison end of the hysteresis comparator U202A, two pins of the resistor R204 are connected with the output end of the hysteresis comparator U202A, and the reference end of the hysteresis comparator U202A is connected with the host computer.

[0056] The reference end of the hysteresis comparator U202A and the host computer are provided with a DAC converter U203, the DAC converter U203 converts a digital signal into an analog signal, the reference signal of the hysteresis comparator U202A comes from the host computer and the external DAC converter U203, the reference voltage can be freely adjusted or remotely set according to the power supply requirement of the connected load device, and the adaptability and versatility of the device are greatly increased. R203 and R204 constitute a hysteresis circuit, and U202A is a wide power integrated comparator.

[0057] The direct current isolation coupling circuit comprises a resistor R205 and a capacitor C202, one pin of the resistor R205 is respectively connected with one pin of the capacitor C202 and the second input end of the H bridge, two pins of the capacitor C202 are connected with the output end of the hysteresis comparator U202A, and two pins of the resistor R205 are grounded. C202 and R205 can also constitute a single pulse generator, and can be automatically converted into a positive pulse generator or a negative pulse generator according to the change of the subsequent circuit; meanwhile, the resistor R205 and the capacitor C202 can also filter the output signal; the triodes Q201-Q206 constitute a classic H bridge circuit, control the orderly work of the bistable relay K201, and form an over-limit self-locking circuit.

[0058] Specifically, the current collecting module comprises a sampling resistor R202, an isolation chip U201, a resistor R201 and a capacitor C201. In the embodiment, the isolation chip U201 is linear output. The sampling resistor R202 is connected in series between the power input end and the relay K201. Two input ends of the isolation chip U201 are connected to two pins of the resistor R202 respectively. The output end of the isolation chip U201 is connected to one pin of the resistor R201, one pin of the capacitor C201 and one pin of the resistor R203 respectively. Two pins of the resistor R201 and two pins of the capacitor C201 are grounded. The sampling resistor R202 is arranged at the high end to avoid low-end sampling and affect the stability of the low level. Meanwhile, the sampling resistor R202 can prevent large inductive or capacitive load from interfering or damaging the sampling circuit. The isolation chip U201 collects the current after photoelectric conversion. One way of the current enters the hysteresis comparator as a monitoring signal of the over-limit self-locking module. As shown in FIG. 8, another way of the current is converted into a digital signal by an ADC converter. The host controller obtains the digital signal of the current value and stores the current value to monitor the working condition of the connected sensor power supply. The U201 adopts a linear optocoupler. The sampling resistor R202 is adjusted to work in the linear region. Figure 2

[0059] The working principle of the telemetry terminal after power-on is as follows: when powered on, the K201 is in a normally closed state. The signal collected by the current sampling module is less than the set value. The hysteresis comparator U202A outputs a low level. The subsequent H-bridge is not started. When the power supply supplies power to the load through the K201. When the load fails, the current consumption is too large, the signal collected by the current sampling module will be greater than the set value, causing the hysteresis comparator to flip, outputting a high level, generating a self-locking start pulse, passing through the H-bridge circuit, triggering the bistable relay K201 to disconnect, cutting off the power supply. When it is necessary to control the bistable relay K201 to connect the power supply to restore the power supply, a unlocking pulse generated by the pulse unit is loaded onto the triode Q202 to unlock the power supply.

[0060] As shown in FIG. 9, the switching switch matrix comprises a plurality of switch units arranged in an array and a decoder. One end of all the switch units in the same column is connected together, the other end of all the switch units in the same row is connected together, the control end of each switch unit is connected with the output end of the decoder, and the input end of the decoder is connected with the host controller. Figures 3-4

[0061] Preferably, each switch unit comprises a triode Q101, a triode Q102 and a resistor R101. The D pole and the S pole of the triode Q102 are two ends of the switch unit respectively.

[0062] ​​The D pole of the triode Q102 is connected with one foot of the resistor R101, the G pole of the triode Q102 is connected with two feet of the resistor R101 and the D pole of the triode Q101 respectively;

[0063] The G pole of the triode Q101 is connected with the output end of the decoder, and the S pole of the triode Q101 is grounded.

[0064] A power failure judgment method of a telemetry terminal, that is, when one or several paths of sensors connected with the RTU have power failure short circuit, the over-limit self-locking module automatically cuts off the path to ensure that other devices can normally operate; when one or several paths of sensor power failure are disconnected, the current sampling module can sense the sensor power failure of the path, can quickly judge the fault source and report.

[0065] The judgment method comprises the following steps:

[0066] Short circuit judgment: the monitoring circuit is used to monitor the current value in real time, and when short circuit occurs, the type of short circuit is distinguished, the type of short circuit comprises one of load short circuit, power line short circuit and short circuit misjudgment; the specific steps are as shown in the following: Figure 5

[0067] S11, the multi-path monitoring circuit respectively acquires multi-path load current information, and judges whether each path of load current is abnormal;

[0068] S12, when one or more paths of load current are excessively large and abnormal, the monitoring circuit automatically cuts off the power input of the abnormal path of load, that is, the current signal collected by the current sampling module is input to the host computer for storage in one path, and is input to the hysteresis comparator in another path; when the current signal is greater than the set value, the hysteresis comparator outputs a high level, generates a self-locking start pulse signal, triggers the bistable relay K201 to be disconnected through the H bridge, cuts off the power supply, and achieves over-limit self-locking;

[0069] S13, the monitoring circuit receives the delay unlocking signal of the host computer, and according to the delay unlocking signal, the power supply of the abnormal path of load is connected again, that is, after the power supply of the path is cut off for a period of time, the time delay is set by the host computer, one pulse signal of the host computer triggers the bistable relay K201 to be closed through the triode Q202, at this time, the sensor can be connected to the power supply again, and the unlocking control is completed; if short circuit does not occur again, it is a false trigger;

[0070] S14, if short circuit occurs again, steps S12-S13 are repeatedly executed, which can be repeated 2-3 times, and the number of times is set by the host computer;

[0071] S15, if the abnormal path of load is still in the short circuit state; the host computer controls the switching of the switch matrix to switch the power supply channel of the abnormal path of load;

[0072] ​S16, after switching the power supply channel, if the abnormal road load remains in a short circuit state, the load appears a short circuit abnormality; if the short circuit state of the abnormal road load is eliminated, the line of the power supply channel before switching is short-circuited.

[0073] Break judgment: the monitoring circuit is used to monitor the current value in real time, and when a break occurs, the break type is distinguished, the break type including one of a load short circuit and a power supply line break, and specifically including the following steps, as shown in Figure 6

[0074] S21, the multi-path monitoring circuit acquires the multi-path load current information respectively, and judges whether each path of load current is abnormal;

[0075] S22, when one or more paths of load current are too small and abnormal, the main control unit controls the switching switch matrix to switch the power supply channel of the abnormal load;

[0076] S23, the current sampling module collects the current value again, if the load current remains in an abnormal state, the load appears a break; if the abnormal state of the load current is eliminated, the line of the power supply channel before switching is broken.

[0077] Further, under normal circumstances, the power consumption of the connected sensor device is certain, which only changes in a small range with temperature, and as the device use time is prolonged, the electronic components are aged, the power consumption will gradually increase, when the consumption changes obviously, it indicates that some performance of the electronic components may change significantly, but it can still work, at this time, early warning is needed, there is a risk of damage in a short time, and it needs to be replaced or repaired, to prevent the device from being damaged in a critical moment such as flood and rain, and to avoid the trouble brought by monitoring.

[0078] Further, under normal circumstances, the power consumption of the connected sensor device is certain, which only changes in a small range with temperature, and as the device use time is prolonged, the electronic components are aged, the power consumption will gradually increase, when the consumption changes obviously, it indicates that some performance of the electronic components may change significantly, but it can still work, at this time, early warning is needed, there is a risk of damage in a short time, and it needs to be replaced or repaired, to prevent the device from being damaged in a critical moment such as flood and rain, and to avoid the trouble brought by monitoring.

[0079] S31, the real-time current value obtained by the monitoring circuit is sent to the main control unit for storage, and the main control unit fits the historical data of the current into a prediction curve, and also corrects the prediction curve;

[0080] S32, when the current test current value deviates from the prediction curve, the main control unit sends a warning information; analyze whether the power supply state of each sensor changes, which can early warn the sensor power working condition, solve the problem in advance, and prevent accidents.

[0081] ​It should be noted that, for the aforementioned various method embodiments, the sequences of the actions are described for simple description, but the person skilled in the art should know that the present application is not limited to the action sequences described, because according to the present application, some steps can be performed in other sequences or simultaneously. In addition, the person skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and units involved are not necessarily necessary for the present application.

Claims

1. A telemetry terminal with power supply monitoring protection, characterized by: The utility model relates to a kind of power supply monitoring system, including master controller, multipath monitoring circuit and switching switch matrix; The switching switch matrix has multiple power supply input terminals and multiple power supply output terminals, and the power supply output terminals are used to connect loads; The acquisition end of each monitoring circuit is connected to the corresponding power supply input terminal, for monitoring the current value of each load, and automatically cutting off the power supply of the power supply input terminal of the switching switch matrix according to the abnormality of the current value; The master controller is used to control the on-off of the switching switch matrix, receive the current value collected by the monitoring circuit, and control the monitoring circuit to turn on the power supply of the power supply input terminal again after cutting off the power supply;The switching switch matrix includes a plurality of switch units arranged in an array and a decoder, one end of all switch units in the same column is connected together, the other end of all switch units in the same row is connected together, the control end of each switch unit is connected to the output end of the decoder, and the input end of the decoder is connected to the master controller; The monitoring circuit includes a current acquisition module and an over-limit self-locking module, the over-limit self-locking module includes a comparison unit, an H-bridge, a relay K201, and a pulse unit, the normally closed switch of the relay K201 is connected in series between the power supply input terminal and the power supply, the first control end of the relay K201 is connected to the first output end of the H-bridge, and the second control end of the relay K201 is connected to the second output end of the H-bridge; The acquisition end of the current acquisition module is connected between the power supply input terminal and the relay K201, the output end of the current acquisition module is connected to the first input end of the comparison unit, the second input end of the comparison unit is connected to the master controller, and the output end of the comparison unit is connected to the second input end of the H-bridge; The first input end of the H-bridge is connected to the pulse unit; The output end of the isolation coupling circuit is connected to the second input end of the H-bridge; The comparison unit includes a hysteresis comparator U202A, a resistor R203, and a resistor R204; One pin of the resistor R203 is connected to the output end of the current acquisition module, two pins of the resistor R203 are respectively connected to one pin of the resistor R204 and the comparison end of the hysteresis comparator U202A, two pins of the resistor R204 are connected to the output end of the hysteresis comparator U202A, and the reference end of the hysteresis comparator U202A is connected to the master controller; The isolation coupling circuit includes a resistor R205 and a capacitor C202, one pin of the resistor R205 is respectively connected to one pin of the capacitor C202 and the second input end of the H-bridge, two pins of the capacitor C202 are connected to the output end of the hysteresis comparator U202A, and two pins of the resistor R205 are grounded.

2. A telemetry terminal with power monitoring protection according to claim 1, characterized in that: The current collecting module comprises a sampling resistor R202, an isolation chip U201, a resistor R201, a capacitor C201, the sampling resistor R202 is connected in series between a power input end and a relay K201, two input ends of the isolation chip U201 are connected to two pins of the resistor R202 respectively; an output end of the isolation chip U201 is connected to one pin of the resistor R201, one pin of the capacitor C201 and one pin of the resistor R203 respectively, two pins of the resistor R201 and two pins of the capacitor C201 are grounded.

3. A telemetry terminal with power monitoring protection according to claim 1, characterized in that: Each switch unit comprises a triode Q101, a triode Q102 and a resistor R101, the D pole and the S pole of the triode Q102 are two ends of the switch unit respectively; the D pole of the triode Q102 is connected to one pin of the resistor R101, the G pole of the triode Q102 is connected to two pins of the resistor R101 and the D pole of the triode Q101 respectively; the G pole of the triode Q101 is connected to an output end of the decoder, and the S pole of the triode Q101 is grounded.

4. A power failure determination method for determining the type of failure of the telemetry terminal with power monitoring protection according to any one of claims 1 to 3, characterized in that The method comprises the following steps: Short circuit judgment: the monitoring circuit is used to monitor the current value in real time, and the type of short circuit is distinguished when the short circuit occurs, the short circuit type including one of load short circuit, power line short circuit and short circuit misjudgment; Open circuit judgment: the monitoring circuit is used to monitor the current value in real time, and the type of open circuit is distinguished when the open circuit occurs, the open circuit type including one of load short circuit and power line open circuit.

5. The power failure determination method of claim 4, wherein: The short circuit judgment comprises the following steps: S11, the multi-way monitoring circuit acquires multi-way load current information respectively, and judges whether each way of load current is abnormal; S12, when one way or more ways of load current are too large and abnormal, the monitoring circuit automatically cuts off the power input of the abnormal way of load; S13, the monitoring circuit receives the delay unlocking signal of the main controller, and connects the power of the abnormal way of load again according to the delay unlocking signal, if the short circuit does not occur again, it is a false trigger; S14, if the short circuit occurs again, steps S12-S13 are repeated; S15, if the abnormal way of load is still in the short circuit state, the main controller controls the switch matrix to switch the power channel of the abnormal way of load; S16, after the power channel is switched, if the abnormal way of load remains in the short circuit state, the load is in the short circuit state; if the short circuit state of the abnormal way of load is eliminated, the line short circuit of the power channel before switching.

6. The power failure determination method of claim 4, wherein: The open circuit judgment comprises the following steps: S21, the multi-way monitoring circuit acquires multi-way load current information respectively, and judges whether each way of load current is abnormal; S22, when one way or more ways of load current are too small and abnormal, the main controller controls the switch matrix to switch the power channel of the abnormal load; S23, if the load current remains in the abnormal state, the load is in the open circuit; if the abnormal state of the load current is eliminated, the line open circuit of the power channel before switching.

7. The method of claim 4, wherein: The circuit fault early warning step further comprises the following steps: S31, the real-time current value acquired by the monitoring circuit is sent to the main controller for storage, and the main controller fits the historical data of the current into a prediction curve; S32, when the current test value deviates from the prediction curve, the main controller sends an early warning information.

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