State monitoring system of fire-fighting power supply

Abstract

The utility model discloses a state monitoring system of a fire-fighting power supply, which belongs to the field of fire-fighting power supplies and comprises a box body, a circuit board is mounted in the box body, and a microcontroller MCU, a voltage sampling circuit, a current detection circuit, a temperature detection circuit and a communication module are arranged on the circuit board. A digital sampling module ADC is arranged in the MCU; the voltage sampling circuit comprises an optocoupler D1 and a measurement module, a transmitting tube of the optocoupler D1 is connected with a to-be-measured line through a current limiting module, a receiving tube of the optocoupler D1 is connected with a digital sampling module ADC of the MCU through the measurement module, and the voltage sampling circuit isolates the to-be-measured line and the measurement module through the optocoupler D1; and the temperature detection circuit is connected to the optocoupler D1. Through integration of voltage, current and temperature multi-parameter detection and an optocoupler temperature compensation technology, omnibearing accurate monitoring of the state of the fire-fighting power supply is realized. And safe isolation between a high-voltage side and a low-voltage control circuit is ensured by adopting isolation type voltage sampling.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of fire power supply, concretely relates to a state monitoring system of fire power supply. BACKGROUND

[0002] In the fire fighting system, the state monitoring of power supply is the key link of ensuring the stable operation of the whole system. The traditional fire power supply monitoring method often depends on the simple voltage and current detection circuit, for example, the Chinese patent with the announcement number CN204809983U discloses an intelligent fire-fighting equipment power supply monitoring system, which comprises a monitor, a power conversion device, a communication module, a current transformer, a voltage transformer, a temperature collector, an ATT7022B electric energy chip, a single-chip microcomputer, a monitoring host, a monitor, a monitoring sensor and the like. The power conversion device is connected with the monitoring sensor, the monitor and the communication module, the communication module is connected with the current transformer, the voltage transformer and the temperature collector, and the single-chip microcomputer is connected with the ATT7022B electric energy chip and the monitoring host, and the monitoring host is connected with the monitor.

[0003] Specifically, these traditional voltage sampling circuits are directly connected with the to-be-detected line without effective electrical isolation measures, are easily affected by external interference, and influence the measurement accuracy and even damage the monitoring equipment. The cost of using the voltage transformer to collect the fire AC220V voltage value is very high, because the voltage transformer is a plug-in component, and manual placement of the voltage transformer on the circuit board is needed during production, which belongs to manual feeding and has low production efficiency. Meanwhile, the voltage transformer plug-in package pin is symmetrical up and down, and the feeding reverse situation is prone to occur during batch manual feeding. After the voltage transformer is reversed, the function of detecting the alternating voltage of the product is lost, which finally causes high production defective rate and needs manual rework. If the detection process is not perfect, there is also a risk of product outflow. These circuits usually do not have temperature compensation function and cannot effectively cope with the influence of environmental temperature change on electrical parameters.

[0004] Therefore, the present application is proposed. UTILITY MODEL CONTENT

[0005] The utility model solves the technical problem in the prior art, and provides a state monitoring system of fire power supply. The utility model is realized through the following technical schemes.

[0006] A state monitoring system of fire power supply, comprising a box body, a circuit board is installed in the box body, a microcontroller MCU, a voltage sampling circuit, a current detection circuit, a temperature detection circuit and a communication module are arranged on the circuit board.

[0007] A digital sampling module ADC is arranged in the microcontroller MCU.

[0008] The voltage sampling circuit comprises an optical coupler D1 and a measurement module, an emitting tube of the optical coupler D1 is connected to a line to be measured through a current limiting module, and a receiving tube of the optical coupler D1 is connected to a digital sampling module ADC of a microcontroller MCU through the measurement module; the voltage sampling circuit is isolated from the line to be measured and the measurement module through the optical coupler D1.

[0009] The temperature detection circuit is connected to the optical coupler D1.

[0010] Preferably, the box body comprises a lower cover assembly, the upper cover assembly is covered on the lower cover assembly, and a circuit board is installed between the upper cover assembly and the lower cover assembly.

[0011] Preferably, the upper cover assembly and the lower cover assembly are connected through fasteners, and a nameplate mounting groove is arranged on the upper cover assembly.

[0012] Preferably, the emitting tube of the optical coupler D1 comprises a positive emitting tube and a negative emitting tube, the negative emitting tube is connected to a zero line N of the line to be measured, and the positive emitting tube is connected to a live line L of the line to be measured through the current limiting module.

[0013] The current limiting module comprises, in sequence and in series, a current limiting resistor R1, a current limiting resistor R2, a current limiting resistor R3, a current limiting resistor R4 and a current limiting resistor R5 between the live line L and the positive emitting tube.

[0014] A diode VD1 is arranged between an output side of the current limiting module and the negative emitting tube of the optical coupler D1, and the diode VD1 is arranged in a direction from the negative emitting tube of the optical coupler D1 to the positive emitting tube of the optical coupler D1 to be conductive and reverse blocking.

[0015] Preferably, the measurement module comprises a measured resistor R7 connected to a receiving tube E, a low-pass filter module is connected in parallel to the measured resistor R7, and the low-pass filter module is connected to the digital sampling module ADC of the microcontroller MCU.

[0016] Preferably, the low-pass filter module comprises a filter resistor R6 and a filter capacitor C2, the filter resistor R6 and the filter capacitor C2 are connected in parallel to the measured resistor R7, a voltage collection point is arranged between the filter resistor R6 and the filter capacitor C2, and the voltage collection point is connected to the digital sampling module ADC of the microcontroller MCU.

[0017] Preferably, the temperature detection circuit comprises a thermistor RT, and the thermistor RT is arranged beside the optical coupler D1.

[0018] Preferably, the thermistor RT is connected in series with a voltage dividing resistor R8, one end of the voltage dividing resistor R8 is connected to the thermistor RT, and the other end of the voltage dividing resistor R8 is connected to an IO port of the microcontroller MCU, so that the current detection circuit is supplied with power through the IO port of the microcontroller MCU.

[0019] Preferably, a filter capacitor C3 is connected in parallel with the thermistor RT, and a current collection point is arranged between the thermistor RT and the filter capacitor C3, and the current collection point is connected to a digital sampling module ADC of the microcontroller MCU.

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] 1. By integrating voltage, current and temperature multi-parameter detection and optocoupler temperature compensation technology, the fire power state is monitored accurately in all directions; the isolation type voltage sampling is adopted to ensure the safe isolation of the high-voltage side and the low-voltage control circuit; the communication module realizes remote data interaction, and the system response speed and intelligent management level are improved.

[0022] 2. The upper cover assembly and the lower cover assembly are designed in a split type, the circuit board is convenient to install and maintain, the sealing structure enhances the protection performance of the box body, and the erosion of dust and moisture to the internal circuit is effectively blocked.

[0023] 3. The high-voltage side signal is safely collected by combining the optocoupler isolation and the current limiting module, the impact of voltage surges on the microcontroller MCU is avoided, and the circuit topology is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the front view of the box body of the utility model;

[0025] Figure 2 is the side view of the box body of the utility model;

[0026] Figure 3 is the back view of the box body of the utility model;

[0027] Figure 4 is the schematic view of the circuit board installation position of the utility model;

[0028] Figure 5 is the schematic view of the voltage sampling circuit of the utility model;

[0029] Figure 6 is the schematic view of the temperature detection circuit of the utility model.

[0030] In the drawing: 1, upper cover assembly; 2, nameplate installation groove; 3, lower cover assembly; 4, fastener; 5, circuit board. DETAILED DESCRIPTION

[0031] The utility model will be further described in combination with the drawings.

[0032] As Figure 1 - Figure 6As shown, the embodiment provides a fire power state monitoring system, which comprises a box body, a circuit board 5 is installed in the box body, a microcontroller MCU, a voltage sampling circuit, a current detection circuit, a temperature detection circuit and a communication module are arranged on the circuit board 5;

[0033] The microcontroller MCU is provided with a digital sampling module ADC, which is used for collecting information, communicating with a superior device, feeding back information to the superior device and receiving control instructions;

[0034] The voltage sampling circuit is isolated by an optical coupler D1 and collects an external voltage value;

[0035] The current detection circuit collects an external current value;

[0036] The temperature detection circuit detects a temperature value of the optical coupler D1 and compensates for temperature drift of the optical coupler through the microcontroller MCU;

[0037] The communication module is used for receiving control instructions of the superior device, communicating with the superior device, feeding back information to the superior device.

[0038] Through integration of voltage, current and temperature multi-parameter detection and optical coupler temperature compensation technology, all-round accurate monitoring of the fire power state is realized; the isolated voltage sampling ensures safety isolation of the high-voltage side and the low-voltage control circuit; the communication module realizes remote data interaction and improves system response speed and intelligent management level.

[0039] Preferably, the box body comprises a lower cover assembly 3, the upper cover assembly 1 is covered on the lower cover assembly 3, and the circuit board 5 is installed between the upper cover assembly 1 and the lower cover assembly 3. The split design of the upper and lower cover assemblies 3 facilitates installation and maintenance of the circuit board 5, the sealing structure enhances the protection performance of the box body and effectively blocks the erosion of dust and moisture on the internal circuit.

[0040] Further, the upper cover assembly 1 and the lower cover assembly 3 are connected through fasteners 4 (the fasteners 4 can use common threaded fastening structures such as screws and bolts), and the upper cover assembly 1 is provided with a nameplate mounting groove 2. The connection of the fasteners 4 ensures the stability of the box body structure, and the nameplate mounting groove 2 provides a standardized identification interface, which facilitates equipment information management and later operation and maintenance tracing.

[0041] Preferably, the voltage sampling circuit comprises an optical coupler D1, an emitting tube of the optical coupler D1 is connected to a to-be-measured line through a current limiting module, and a receiving tube of the optical coupler D1 is connected to a digital sampling module ADC of the microcontroller MCU through a measurement module.

[0042] Preferably, the emitting tube of the optical coupler D1 comprises a positive emitting tube and a negative emitting tube, the negative emitting tube is connected to a zero line N of the to-be-measured line, and the positive emitting tube is connected to a live line L of the to-be-measured line through the current limiting module.

[0043] The current limiting module comprises, in sequence, a current limiting resistor R1, a current limiting resistor R2, a current limiting resistor R3, a current limiting resistor R4 and a current limiting resistor R5 connected in series between the live wire L and the positive electrode of the transmitting tube.

[0044] A diode VD1 is arranged between the output side of the current limiting module and the negative electrode of the transmitting tube of the optocoupler D1, and the diode VD1 is arranged to be conductive from the negative electrode of the transmitting tube of the optocoupler D1 to the positive electrode of the transmitting tube of the optocoupler D1 and reverse blocking.

[0045] The high-voltage side signal is safely collected by the optocoupler isolation combined with the current limiting module, the impact of voltage surges on the microcontroller MCU is avoided, and the circuit topology is simplified.

[0046] Preferably, the measurement module comprises a to-be-measured resistor R7 connected to the receiving tube E pole, and a low-pass filter module is connected in parallel to the to-be-measured resistor R7, and the low-pass filter module is connected to the digital sampling module ADC of the microcontroller MCU.

[0047] Preferably, the low-pass filter module comprises a filter resistor R6 and a filter capacitor C2, which are connected in parallel to the to-be-measured resistor R7, and a voltage collection point is arranged between the filter resistor R6 and the filter capacitor C2, and the voltage collection point is connected to the digital sampling module ADC of the microcontroller MCU.

[0048] The multi-stage current limiting resistor series design disperses power loss, reduces the risk of single resistor overheating, prevents current backflow by using the reverse blocking characteristic of the diode VD1, and further improves the safety of the circuit. The low-pass filter module effectively filters out interference signals, ensures the stability and accuracy of the voltage sampling value, and reduces the risk of misjudgment. Specifically, the filter resistor R6 and the filter capacitor C2 are connected in parallel to form an RC low-pass filter, which optimizes the high-frequency noise suppression effect and improves the signal-to-noise ratio of the sampled signal of the digital sampling module ADC.

[0049] Specifically, the voltage collected by the digital sampling module ADC is the voltage across the to-be-measured resistor R7, the primary current value of the optocoupler D1 depends on the size of the external measured voltage, and the conversion relationship between the primary current and the secondary current of the optocoupler D1 is affected by the transmission ratio of the optocoupler itself, but the transmission ratio of the optocoupler D1 is known, so the secondary current of the optocoupler D1 forms a loop with the size of the external measured voltage, and the secondary current of the optocoupler D1 multiplied by the resistance value of the resistor equals the collection value of the voltage collection point. Therefore, by collecting the voltage collection point, the voltage value of the external measured voltage can be equivalent.

[0050] Preferably, the temperature detection circuit comprises a thermistor RT arranged beside the optocoupler D1. The thermistor RT is arranged close to the optocoupler D1, can sense the temperature change of the optocoupler D1 in real time, provides accurate data source for temperature drift compensation, and improves the reliability of current detection.

[0051] Preferably, the thermistor RT is connected in series with a voltage dividing resistor R8, one end of the voltage dividing resistor R8 is connected to the thermistor RT, and the other end is connected to the IO port of the microcontroller MCU, so as to provide power supply for the current detection circuit through the IO port of the microcontroller MCU. The voltage dividing resistor R8 is linked with the IO port of the MCU, realizes controllability of power supply of the current detection circuit, reduces static power consumption, and simplifies dependence on external power supply.

[0052] Preferably, the thermistor RT is connected in parallel with a filter capacitor C3, and a current collection point is arranged between the thermistor RT and the filter capacitor C3, and the current collection point is connected to the digital sampling module ADC of the microcontroller MCU. The filter capacitor C3 is connected in parallel with the thermistor, eliminates the influence of environmental electromagnetic interference on the current signal, and ensures the stability and anti-interference of the ADC collected data.

[0053] Specifically, the resistance value of the thermistor RT changes with the change of temperature, the voltage dividing resistor R8 is a resistor with fixed resistance value, therefore, the resistance value of the thermistor TR can be obtained by detecting the voltage value between the two ends of the thermistor RT, and the equivalent temperature value can be obtained synchronously.

Claims

1. A status monitoring system for a fire service power supply, characterized by: The box body is provided with a circuit board (5) installed therein, and the circuit board (5) is provided with a microcontroller MCU, a voltage sampling circuit, a current detection circuit, a temperature detection circuit and a communication module; The microcontroller MCU is provided with a digital sampling module ADC; The voltage sampling circuit comprises an optical coupler D1 and a measurement module, an emitting tube of the optical coupler D1 is connected to a to-be-measured line through a current limiting module, a receiving tube of the optical coupler D1 is connected to the digital sampling module ADC of the microcontroller MCU through the measurement module, and the voltage sampling circuit is isolated from the to-be-measured line and the measurement module through the optical coupler D1. The temperature detection circuit is connected to the optical coupler D1.

2. The status monitoring system of a fire pump power supply according to claim 1, wherein: The box body comprises a lower cover assembly (3), the upper cover assembly (1) is covered on the lower cover assembly (3), and the circuit board (5) is installed between the upper cover assembly (1) and the lower cover assembly (3).

3. A status monitoring system for a fire pump according to claim 2, wherein: The upper cover assembly (1) and the lower cover assembly (3) are connected through a fastener (4), and the upper cover assembly (1) is provided with a nameplate mounting groove (2).

4. A status monitoring system for a fire pump according to any one of claims 1-3, characterized in that: The emitting tube of the optical coupler D1 comprises a positive emitting tube and a negative emitting tube, the negative emitting tube is connected to a zero line N of the to-be-measured line, and the positive emitting tube is connected to a live line L of the to-be-measured line through the current limiting module; The current limiting module comprises current limiting resistors R1, R2, R3, R4 and R5 connected in series between the live line L and the positive emitting tube; A diode VD1 is arranged between the output side of the current limiting module and the negative emitting tube of the optical coupler D1, and the diode VD1 is arranged in a direction from the negative emitting tube of the optical coupler D1 to the positive emitting tube of the optical coupler D1 to be conductive and reverse blocking.

5. A status monitoring system for a fire pump according to any one of claims 1-3, characterized in that: The measurement module comprises a to-be-measured resistor R7 connected to a receiving tube E, the to-be-measured resistor R7 is provided with a low-pass filtering module in parallel, and the low-pass filtering module is connected to the digital sampling module ADC of the microcontroller MCU.

6. A status monitoring system for a fire pump according to claim 5, wherein: The low-pass filtering module comprises a filter resistor R6 and a filter capacitor C2, the filter resistor R6 and the filter capacitor C2 are connected in parallel on the to-be-measured resistor R7, a voltage collection point is arranged between the filter resistor R6 and the filter capacitor C2, and the voltage collection point is connected to the digital sampling module ADC of the microcontroller MCU.

7. A status monitoring system for a fire pump according to any one of claims 1-3, characterized in that: The temperature detection circuit comprises a thermistor RT arranged beside the optical coupler D1.

8. A status monitoring system for a fire pump power supply according to claim 7, wherein: The thermistor RT is connected in series with a voltage dividing resistor R8, one end of the voltage dividing resistor R8 is connected to the thermistor RT, and the other end of the voltage dividing resistor R8 is connected to an IO port of the microcontroller MCU, so that the current detection circuit is provided with a power supply through the IO port of the microcontroller MCU.

9. A status monitoring system for a fire pump power supply according to claim 8, wherein: The thermistor RT is provided with a filter capacitor C3 in parallel, a current collection point is arranged between the thermistor RT and the filter capacitor C3, and the current collection point is connected to the digital sampling module ADC of the microcontroller MCU.

Images