CN114280337A - Single-channel multiplexing type fire monitoring detector and electrical fire monitoring system - Google Patents
Single-channel multiplexing type fire monitoring detector and electrical fire monitoring system Download PDFInfo
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- CN114280337A CN114280337A CN202111461982.0A CN202111461982A CN114280337A CN 114280337 A CN114280337 A CN 114280337A CN 202111461982 A CN202111461982 A CN 202111461982A CN 114280337 A CN114280337 A CN 114280337A
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Abstract
The application relates to a single-channel multiplexing type fire monitoring detector and an electrical fire monitoring system. The single-channel multiplexing fire monitoring detector comprises: the device comprises a control unit, a circuit switching unit, a multiplexing detection interface and at least two detection circuits. Wherein, the accessible circuit switching unit switches over the type with the detection circuitry that multiplexing detection interface switched on to multiplexing detection interface joinable corresponds the sensor of type, also through same multiplexing detection interface, the accessible is connected different sensors and is gathered different detection data, realizes the "multiplexing" of single detection interface (single channel), thereby the user can carry out nimble configuration to single channel multiplexing formula fire monitoring detector according to actual need, satisfies actual engineering needs better.
Description
Technical Field
The application relates to the technical field of electrical fire monitoring, in particular to a single-channel multiplexing fire monitoring detector and an electrical fire monitoring system.
Background
The national standard GB14287-2005 "electrical fire monitoring system" stipulates that the electrical fire monitoring detector is divided into two types, namely "residual current type electrical fire monitoring detector" and "temperature measurement type electrical fire monitoring detector", by detection parameters, and in the national standard, the residual electricity and temperature in the electrical fire protection are considered to be the key points for monitoring, and in fact, the main cause of the occurrence of the electrical fire is generally caused by an earth arc short circuit, and an excessively high temperature of equipment or a connection point.
The existing fire monitoring detector comprises an independent type and a combined type, wherein the independent type only comprises one detection interface for detecting temperature or residual current, and the combined type comprises two detection interfaces, so that the temperature and the residual current can be simultaneously detected through different interfaces. However, the detection content of each detection interface is fixed no matter whether the detection interface is independent or composite, so that the universality of the detector is poor, and the actual requirements of different projects or users cannot be flexibly met.
Disclosure of Invention
The application provides a multiplexing formula conflagration monitoring detector of single channel and electric fire monitored control system to solve traditional conflagration monitoring detector because every detection interface's detection content is fixed, lead to the commonality very poor, can't satisfy the problem of different engineering or user's actual demand in a flexible way.
The above object of the present application is achieved by the following technical solutions:
in a first aspect, an embodiment of the present application provides a single-channel multiplexing type fire monitoring detector, which includes: the circuit comprises a control unit, a circuit switching unit, a multiplexing detection interface and at least two detection circuits;
the control unit is connected with the circuit switching unit and used for sending a control signal to the circuit switching unit;
the circuit switching unit is also connected with the multiplexing detection interface and all the detection circuits and is used for enabling the multiplexing detection interface to be conducted with only one of the detection circuits according to the control signal;
the multiplex detection interface is used for connecting the sensor and transmitting detection data acquired by the sensor to a currently communicated detection circuit; the different types of detection circuits are used for processing detection data acquired by the different types of sensors.
Optionally, the circuit switching unit includes a plurality of switch elements, and the control signal sent by the control unit is used to control the plurality of switch elements to be in corresponding switch states, so that the multiplexing detection interface is only conducted with one of the detection circuits; wherein the switching element comprises a transistor.
Optionally, the detection circuit includes a first detection circuit and a second detection circuit; the circuit switching unit comprises a first triode, a second triode, a first resistor, a second resistor, a third resistor and a fourth resistor; the first triode is a PNP triode and the second triode is an NPN triode;
the base electrode of the first triode is connected with the control end of the control unit through the second resistor, the emitting electrode of the first triode is connected with the multiplexing detection interface, and the collecting electrode of the first triode is connected with the first detection circuit;
the base electrode of the second triode is connected with the control end of the control unit through the third resistor, the collector electrode of the second triode is connected with the multiplexing detection interface, and the emitter electrode of the second triode is connected with the second detection circuit;
the first resistor is connected between the base electrode and the emitting electrode of the first triode in parallel, and the fourth resistor is connected between the base electrode and the emitting electrode of the second triode in parallel.
Optionally, the sensor includes: a current sensor for detecting a residual current and a temperature sensor for detecting a temperature.
Optionally, the single-channel multiplexing fire monitoring detector further comprises a three-phase current detection interface and a three-phase voltage detection interface connected with the control unit;
the control unit is further used for acquiring the three-phase current and the three-phase voltage of the monitored circuit through the three-phase current detection interface and the three-phase voltage detection interface, and calculating based on the acquired three-phase current and three-phase voltage to obtain power consumption data corresponding to the monitored circuit.
Optionally, the single-channel multiplexing fire monitoring detector further includes an indicator light connected to the control unit; the indicating lamp is used for indicating the working state of the single-channel multiplexing type fire monitoring detector.
Optionally, the single-channel multiplexing fire monitoring detector further includes a dial switch connected to the control unit;
the dial switch is used for sending a trigger instruction to the control unit according to user operation so as to enable the control unit to generate the control signal.
In a second aspect, embodiments of the present application further provide an electrical fire monitoring system, which includes: the fire monitoring system comprises a single-channel multiplexing fire monitoring detector and a control center in communication connection with the single-channel multiplexing fire monitoring detector;
and the control center is used for sending a control instruction to the single-channel multiplexing type fire monitoring detector so as to enable the control unit to generate the control signal and acquire the monitoring data acquired by the single-channel multiplexing type fire monitoring detector.
Optionally, if the single-channel multiplexing fire monitoring detector comprises a three-phase current detection interface and a three-phase voltage detection interface which are connected with the control unit;
and the control center is also used for sending a switching instruction to the single-channel multiplexing type fire monitoring detector so as to enable the control unit to start or stop acquiring the three-phase current and the three-phase voltage of the monitored circuit.
Optionally, the number of the single-channel multiplexing fire monitoring detectors is multiple, and the multiple multiplexing fire monitoring detectors are connected to the control center through multiple expansion interfaces of the expansion module respectively.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
the embodiment of the application provides a technical scheme, accessible circuit switching unit switches over the type with multiplexing detection circuitry that detects the interface and switches on, thereby multiplexing detection interface joinable corresponds the sensor of type, also through same multiplexing detection interface, the accessible is connected different sensors and is gathered different detection data, realize the "multiplexing" of single detection interface (single channel), thereby the user can carry out nimble configuration to the multiplexing formula fire monitoring detector of single channel according to actual need, satisfy actual engineering needs better.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic diagram of a single-channel multiplexing fire monitoring detector according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit structure diagram of a relevant portion of a circuit switching unit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit structure diagram of a relevant portion of another circuit switching unit according to an embodiment of the present application;
FIG. 4 is a block diagram of a fire monitoring detector according to an embodiment of the present disclosure;
FIG. 5 is a topology diagram of an electrical fire monitoring system according to an embodiment of the present disclosure;
FIG. 6 is a diagram of a data protocol;
fig. 7 is a diagram of a message body portion of the data protocol of fig. 6.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
In order to make the technical solution of the present application easier to understand, the related art and the problems thereof will be briefly described below.
In the existing composite fire monitoring detector, a plurality of detection interfaces are usually included, and the types of the detection interfaces are two (for detecting residual current and temperature respectively), and in case of 4 residual current detection interfaces and 2 temperature detection interfaces, the detector can simultaneously acquire residual current data of at most 4 circuits and temperature data of at most 2 circuits. However, in actual engineering, the number of circuits that a user needs to monitor the residual current may not be 4, and the number of positions that the user needs to monitor the temperature may not be 2, but since the detection content of each detection interface of the detector is fixed, the detector has poor versatility, and cannot flexibly meet the actual requirements of different engineering or users.
For better understanding, for example, in a scenario where a user needs to monitor the residual current at 4 and the temperature at 2, the above detector just meets the requirement; in another scenario, the user may need to monitor 3 residual currents and 3 temperatures, and then the detector can meet the requirements for residual currents (3 connections are selected from 4 residual current detection interfaces), but cannot meet the requirements for temperatures (because there are only 2 temperature detection interfaces). For the latter scenario, it is inconvenient for the user to select other detectors including more temperature detection interfaces, or to additionally arrange one detector.
For the independent detectors, since both the two detectors can only detect one kind of data, when the user needs to monitor the residual current and the temperature at the same time, at least two detectors need to be arranged, which causes problems of cost, occupying more space and the like.
In order to solve the problem, the application provides a multiplexing formula conflagration monitoring detector of single channel and contains its electric fire monitored control system, through the mode that switching element switching circuit connects, makes same interface can gather different detection data to improve the flexibility of detector. The details of the embodiment are described below by way of examples.
Examples
Referring to fig. 1, fig. 1 is a schematic diagram of a single-channel multiplexing fire monitoring detector according to an embodiment of the present application. As shown in fig. 1, the single-channel multiplexing fire monitoring detector (hereinafter referred to as a detector) of this embodiment includes a control unit 1, a circuit switching unit 2, a multiplexing detection interface 3, and at least two detection circuits 4 (only two, i.e., a first detection circuit and a second detection circuit, are shown in fig. 1, but may include 3 or more in practical application);
the control unit 1 is connected with the circuit switching unit 2 and used for sending a control signal to the circuit switching unit 2;
the circuit switching unit 2 is further connected with the multiplexing detection interface 3 and all the detection circuits 4, and is configured to enable the multiplexing detection interface 3 to be conducted with only one of the detection circuits according to the control signal sent by the control unit 1;
the multiplexing detection interface 3 is used for connecting a sensor and transmitting detection data acquired by the sensor to a detection circuit 4 which is communicated currently; the different types of detection circuits are used for processing detection data acquired by the different types of sensors.
In specific application, the control Unit 1 may be implemented based on a control chip such as an MCU ((Microcontroller Unit, Microcontroller Unit 1), and the type thereof may be selected according to actual needs, and is not particularly limited.
After the control unit 1 sends a control signal to the circuit switching unit 2, the operating state of the circuit switching unit 2 can be changed, so that the circuit switching unit 2 can change the circuit connection relationship, and the multiplexing detection interface 3 is conducted with different detection circuits 4. Therefore, after the sensor connected with the multiplexing detection interface 3 collects corresponding data, the collected data is transmitted to the currently communicated detection circuit 4 for processing. However, since the data processed by the detection circuit 4 generally cannot be directly applied subsequently, in practical application, the detection circuit 4 is further connected to the control unit 1, and is configured to send the processed detection data to the control unit 1 for subsequent processing, so as to perform operations such as alarming when the detection data is judged to be abnormal subsequently. The data processing performed by the detection circuit 4 is mainly for facilitating the control unit 1 to perform subsequent processing, and reference may be made to a conventional method, which is not described in detail herein.
When the circuit switching unit 2 is implemented, it may include a plurality of switching elements, so that the control signal sent by the control unit 1 is used to control the plurality of switching elements to be in corresponding switching states, so that the multiplexing detection interface 3 is only conducted with one of the detection circuits 4. That is, the control unit 1 changes the circuit connection relationship by controlling the switching element of the circuit switching unit 2, thereby changing the detection circuit 4 that can receive the detection data. Further, the switching element may be a transistor. Of course, MOS transistors or other switching elements may be used, and this is not limited.
For the sake of understanding, a possible circuit configuration of the circuit switching unit is described by a specific embodiment with reference to the drawings.
Referring to fig. 2, in the present embodiment, taking two types of detection circuits, i.e., a first detection circuit and a second detection circuit, as an example, the probe includes a first transistor Q1, a second transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4; the first triode Q1 is a PNP type triode, and the second triode Q2 is an NPN type triode; the base electrode of the first triode Q1 is connected with the control end of the control unit through a second resistor R2, the emitting electrode is connected with the multiplexing detection interface, and the collecting electrode is connected with the first detection circuit; the base electrode of the second triode Q2 is connected with the control end of the control unit through a third resistor R3, the collector electrode of the second triode Q2 is connected with the multiplexing detection interface, and the emitter electrode of the second triode Q2 is connected with the second detection circuit; the first resistor R1 is connected in parallel between the base and the emitter of the first triode Q1, and the fourth resistor R4 is connected in parallel between the base and the emitter of the second triode Q2.
Wherein, the resistors R1, R2, R3 and R4 mainly play a protection role. The bases of the first transistor Q1 and the second transistor Q2 are connected to the same control terminal (connected to a common enable pin) of the control unit. Based on this, since the first triode Q1 is a PNP type triode and the second triode Q2 is an NPN type triode, when the control end of the control unit outputs a high level, the first triode Q1 is turned off, the second triode Q2 is turned on, and at this time, only the second detection circuit can acquire the detection data transmitted by the multiplexing detection interface; when the control end of the control unit outputs a high level, the first triode Q1 is turned on, the second triode Q2 is turned off, and at this time, only the first detection circuit can acquire the detection data transmitted by the multiplexing detection interface. The high level and the low level output by the control unit are the control signals. The switching function of the circuit switching unit is realized through the scheme, so that the detection of two different parameters can be realized through the matching of one multiplexing detection interface and two detection circuits. For example, when the adopted sensor is a current sensor or a temperature sensor, the detection of the residual current or the temperature can be realized.
In addition, as shown in fig. 2, in practical applications, after the detection circuit processes the detection data, the detection data may be amplified by a common signal amplification circuit and input to a detection terminal of the control unit (e.g., an ADC detection port of the MCU) under the action of the clamp protection circuit, so that the control unit can better perform subsequent processing.
In addition, although the above description is given by taking two detection circuits as an example, when the detector includes more detection circuits, the detection can be realized by the same principle, and only more switching elements (such as a triode) need to be added according to actual situations, for example, when 4 detection circuits are included, the detection can be realized by using the circuit schematic diagram shown in fig. 3, and at this time, the detection of four different parameters (such as voltage, current, temperature, humidity, and the like) can be realized by matching one multiplexing detection interface with the four detection circuits, so as to meet the requirements of different users for different detections.
Through the scheme of the embodiment, the type of the detection circuit conducted with the multiplex detection interface can be switched through the circuit switching unit, so that the multiplex detection interface can be connected with the sensors of the corresponding type, namely, through the same multiplex detection interface, different detection data can be acquired through connecting different sensors, and multiplexing of a single detection interface (single channel) is realized, so that a user can flexibly configure the single-channel multiplex fire monitoring detector according to actual needs, and the actual engineering needs are better met.
In addition, in order to enable the detector to provide more functions and meet more requirements of users, in some embodiments, the detector further comprises a three-phase current detection interface and a three-phase voltage detection interface which are connected with the control unit; correspondingly, the control unit is also used for acquiring the three-phase current and the three-phase voltage of the monitored circuit through the three-phase current detection interface and the three-phase voltage detection interface, and calculating based on the acquired three-phase current and three-phase voltage to obtain the power consumption data corresponding to the monitored circuit.
Wherein, three-phase current detection interface and three-phase voltage detect the interface and connect corresponding sensor respectively in order to realize corresponding data acquisition, so, handle the back through the detector, can realize the monitoring to power consumption data to can save the cost of purchasing the electric energy meter for the user.
In addition, in some embodiments, the detector further comprises an indicator light connected to the control unit; the indicating lamp is used for indicating the working state of the single-channel multiplexing type fire monitoring detector. For example, indicator lights of different colors may be provided, a green light may be lit when the detector is operating normally, a red light may be lit when an abnormal alarm occurs in the monitored data, and a red light may flash when the detector fails, etc. Therefore, the working state of the detector can be better known by a user through the indicator lamp.
In order to be able to intuitively understand the structural framework of the detector, fig. 4 provides a framework diagram of a fire monitoring detector, in fig. 4, the lower 1-6 are multiplexing detection interfaces, and a and B are communication interfaces for communicating with other devices; the IC, IB and IA on the upper part are three-phase current interfaces, the UC, UB and UA are three-phase voltage interfaces, and the PE, N and L are power supply interfaces for connecting the detector with a power supply; and three indicator lights are arranged on the left side and are respectively used for indicating normal operation, abnormal alarm and detector failure.
In addition, in practical applications, before the detector is used, a user needs to perform corresponding configuration, such as configuring a current detection data type of the multiplexing detection interface, and therefore, a corresponding configuration approach is needed. In the existing detector, a key and an LCD screen are usually arranged on the detector for a user to configure parameters, but there are many problems in this way, including: each time the configuration parameters are changed, the user needs to configure on site; due to the fact that the key, the LCD screen and other components are added, the occupied space of the detector is increased, and therefore the design of the power distribution cabinet is affected (in practical application, the detector is usually arranged in the power distribution cabinet to protect the detector, and other equipment can be arranged in the power distribution cabinet), and the like.
In view of the above problems, the present application provides an electrical fire monitoring system, as shown in fig. 5, the electrical fire monitoring system includes the above single-channel multiplexing fire monitoring detector and a control center in communication connection with the single-channel multiplexing fire monitoring detector; the control center is configured to send a control instruction to the single-channel multiplexing fire monitoring detector, so that the control unit generates the control signal according to the above embodiment, and acquires monitoring data acquired by the single-channel multiplexing fire monitoring detector.
Therefore, through the control center, a user can remotely realize the configuration of the single-channel multiplexing type fire monitoring detector, including the data type which is currently required to be detected through the multiplexing detection interface and the like. In addition, the control center can also obtain the operation diary of the detector and the operation data collected by the detector, such as residual current, temperature and other data in different time periods, and can also obtain power utilization data when the detector comprises a three-phase current detection interface and a three-phase voltage detection interface. Thereby facilitating remote analysis by the user.
In addition, if the detector comprises a three-phase current detection interface and a three-phase voltage detection interface, a switch instruction can be sent to the single-channel multiplexing type fire monitoring detector through the control center so that the control unit starts or stops acquiring the three-phase current and the three-phase voltage of the monitored circuit. That is, a user can remotely configure whether to start the power consumption data monitoring function of the detector through the control center, if not, part of circuits of the detector do not work, so that the power consumption can be reduced, and meanwhile, the control center cannot acquire the power consumption data; if the power consumption data is started, the detector acquires three-phase current and three-phase voltage, corresponding processing can be carried out to obtain power consumption data, and the power consumption data is sent to the control center when the control center requests the data.
In addition, as shown in fig. 5, in a specific implementation, the probe may be connected to the extension module through a corresponding communication manner (in fig. 5, the probe is connected to the RS485 extension module through RS485 communication, and other extension modules may be selected in practical applications), and then the extension module is connected to the network controller, and finally the network controller is connected to the control center through ethernet or the like (a communication protocol may be BACnet IP or other protocols), so as to implement communication between the probe and the control center.
In some embodiments, the number of the single-channel multiplexing fire monitoring detectors is multiple, and the multiple multiplexing fire monitoring detectors are respectively connected to the control center through multiple expansion interfaces of the expansion module. That is, can connect the multiplexing formula fire control detector of a plurality of single channels (64 can be connected to RS485 extension module at most) through the extension module, with the monitoring data transmission that a plurality of multiplexing formula fire control detector gathered to control center to be convenient for actual scene design.
In practical applications, the control center communicates with the detector through a specific data protocol, and a schematic diagram of the data protocol is shown in fig. 6 and includes at least four parts, namely, a device address, a frame type, a Cyclic Redundancy Check (CRC), and a frame end.
Wherein the device address is used to distinguish different probes connected to the expansion module (when the RS485 expansion module is used, the device address is 64 at maximum, that is, 64 probes are supported and connected at most).
The frame type is divided into a control frame and a request frame, the control frame further includes a message body of 1 byte (8 bits) between the frame type and the CRC (as shown in fig. 7), and the request frame does not include the message body; the control frame is divided into two types, namely on-off control and detection type control, when the control frame is on-off control, high bits (7 and 6) of a message body are reserved, and other bits (0-5) respectively control whether IA, IB, IC, UA, UB and UC are started for detection; when the control frame is controlled by the detection type, high bits (7 and 6) of a message body are reserved, other bits (0-5) respectively control the detection type of the 1-6 multiplexing detection interface, the temperature is detected when each bit value is 0, and the residual current is detected when the value is 1.
The request frame is also divided into two types, namely a diary operation request and a power consumption data request. After the control center issues data, the data are converted through various protocols and then transmitted to the electric fire monitoring detector, and the detector sends back multiframes to the control center according to the received data. And when the received frame type is a request frame, the detector replies a running diary or power consumption data.
In addition, the CRC is used for checking, followed by a tail to indicate termination.
By the scheme, communication of all parts of the electrical fire monitoring system can be realized, and if the RS-485 communication protocol is adopted, data can be captured and identified based on the standard RS-485 protocol in the message transmission process, multiple tests can be carried out to compare data before and after the comparison, and whether the operation strategy changes or not can be judged according to the data change before and after the comparison based on the multiple tests.
It should be noted that, when the above-mentioned parts of the electrical fire monitoring system communicate with each other, the standard communication protocol used is not limited to the above-mentioned protocol. For example, RS-485 communication may be replaced with other protocols (e.g., IIC or SPI, etc.).
Furthermore, in order to allow such users to make good use of the detector, considering that some users may not need to use the control center, the detector may in some embodiments further comprise a dial switch connected to the control unit; the dial switch is used for sending a trigger instruction to the control unit according to user operation so as to enable the control unit to generate the control signal, and therefore configuration of the data type detected by the multiplexing detection interface is achieved. Therefore, the user can configure the detector on site on the basis of not obviously increasing the detectors.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A single channel multiplexed fire monitoring detector comprising: the circuit comprises a control unit, a circuit switching unit, a multiplexing detection interface and at least two detection circuits;
the control unit is connected with the circuit switching unit and used for sending a control signal to the circuit switching unit;
the circuit switching unit is also connected with the multiplexing detection interface and all the detection circuits and is used for enabling the multiplexing detection interface to be conducted with only one of the detection circuits according to the control signal;
the multiplex detection interface is used for connecting the sensor and transmitting detection data acquired by the sensor to a currently communicated detection circuit; the different types of detection circuits are used for processing detection data acquired by the different types of sensors.
2. The single-channel multiplexing fire monitoring detector according to claim 1, wherein the circuit switching unit comprises a plurality of switching elements, and the control signal sent by the control unit is used for controlling the plurality of switching elements to be in corresponding switching states, so that the multiplexing detection interface is conducted with only one of the detection circuits; wherein the switching element comprises a transistor.
3. The single channel multiplexed fire monitoring detector of claim 2, wherein the detection circuit comprises a first detection circuit and a second detection circuit; the circuit switching unit comprises a first triode, a second triode, a first resistor, a second resistor, a third resistor and a fourth resistor; the first triode is a PNP triode and the second triode is an NPN triode;
the base electrode of the first triode is connected with the control end of the control unit through the second resistor, the emitting electrode of the first triode is connected with the multiplexing detection interface, and the collecting electrode of the first triode is connected with the first detection circuit;
the base electrode of the second triode is connected with the control end of the control unit through the third resistor, the collector electrode of the second triode is connected with the multiplexing detection interface, and the emitter electrode of the second triode is connected with the second detection circuit;
the first resistor is connected between the base electrode and the emitting electrode of the first triode in parallel, and the fourth resistor is connected between the base electrode and the emitting electrode of the second triode in parallel.
4. The single channel multiplexed fire monitoring detector of claim 1, wherein the sensor comprises: a current sensor for detecting a residual current and a temperature sensor for detecting a temperature.
5. The single-channel multiplexing fire monitoring detector according to claim 1, further comprising a three-phase current detection interface and a three-phase voltage detection interface connected to the control unit;
the control unit is further used for acquiring the three-phase current and the three-phase voltage of the monitored circuit through the three-phase current detection interface and the three-phase voltage detection interface, and calculating based on the acquired three-phase current and three-phase voltage to obtain power consumption data corresponding to the monitored circuit.
6. The single channel multiplexed fire monitoring detector of claim 1, further comprising an indicator light connected to the control unit; the indicating lamp is used for indicating the working state of the single-channel multiplexing type fire monitoring detector.
7. The single channel multiplexed fire monitoring detector of claim 1, further comprising a dip switch coupled to the control unit;
the dial switch is used for sending a trigger instruction to the control unit according to user operation so as to enable the control unit to generate the control signal.
8. An electrical fire monitoring system, comprising: the single channel multiplexed fire monitoring detector of any of claims 1-7 and a control center communicatively coupled to the single channel multiplexed fire monitoring detector;
and the control center is used for sending a control instruction to the single-channel multiplexing type fire monitoring detector so as to enable the control unit to generate the control signal and acquire the monitoring data acquired by the single-channel multiplexing type fire monitoring detector.
9. The electrical fire monitoring system of claim 8, wherein if the single channel multiplexed fire monitoring detector includes a three-phase current detection interface and a three-phase voltage detection interface connected to the control unit;
and the control center is also used for sending a switching instruction to the single-channel multiplexing type fire monitoring detector so as to enable the control unit to start or stop acquiring the three-phase current and the three-phase voltage of the monitored circuit.
10. The electrical fire monitoring system of claim 8, wherein the number of the single-channel multiplexed fire monitoring detectors is plural, and the plural multiplexed fire monitoring detectors are respectively connected to the control center through plural extension interfaces of the extension module.
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