Fault detection circuit of security monitoring system

Abstract

The utility model relates to the technical field of security and protection monitoring, in particular to a fault detection circuit of a security and protection monitoring system, which comprises monitoring equipment, a voltage sampling circuit, a first analog-to-digital conversion chip, a temperature acquisition circuit, a current sampling circuit, a second analog-to-digital conversion chip and a microprocessor, two input ends of the voltage sampling circuit are respectively connected with two ends of monitoring equipment, the temperature acquisition circuit is installed inside the monitoring equipment, the current sampling circuit is used for acquiring working current of the monitoring equipment, the voltage sampling circuit, the first analog-to-digital conversion chip and the microprocessor are electrically connected in sequence, the temperature acquisition circuit is electrically connected with the microprocessor, and the microprocessor is electrically connected with the first analog-to-digital conversion chip. And the current sampling circuit, the second digital-to-analog conversion chip and the microprocessor are electrically connected in sequence. According to the utility model, the voltage, the temperature and the current of the monitoring equipment can be respectively collected in real time, the multi-dimensional comprehensive monitoring of the working state of the monitoring equipment is realized, the potential fault hidden danger can be found in time, and the practicability is stronger.

Description

TECHNICAL FIELD

[0001] The utility model relates to the security monitoring technical field, specifically, relate to the fault detection circuit of security monitoring system. BACKGROUND

[0002] In the security monitoring system, the stable operation of monitoring equipment is crucial to security protection;However, the traditional security monitoring system often lacks effective fault detection means;Once the monitoring equipment fails, it may not be able to be found and handled in time, resulting in monitoring loopholes and affecting the security effect.

[0003] The invention patent with publication number CN111787311A discloses a kind of security monitoring camera's fault detection system and method, the detection system includes video image duration and length judgment module, investigation judgment module and investigation information transmission module, the video image duration and length judgment module is used to judge whether the each frame video image of camera is sustained and the relationship between the continuous time length of sustained and continuous time length threshold value, the investigation judgment module further gathers the information of other cameras according to the judgment result of video image duration judgment module and judges the transmission information of camera possible existence fault condition and removes information transmission module to work, the investigation information transmission module is used to transmit information and investigate corresponding camera.

[0004] Although the invention judges whether to transmit information and investigate corresponding camera by detecting whether the each frame video image of camera is sustained and the video image of corresponding preferred adjacent camera is sustained, and transmits the information of suspected fault camera after determining suspected fault camera through multi-aspect detection, reduces the probability of misjudgment, but the fault of security monitoring system is not limited to video image aspect, and the hardware running state of monitoring equipment also has key influence on the stability of system. UTILITY MODEL CONTENT

[0005] The utility model aims at providing the fault detection circuit of security monitoring system to solve the problems raised in the above background.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] The fault detection circuit of the security monitoring system comprises a monitoring device, a voltage sampling circuit, a first analog-digital conversion chip, a temperature acquisition circuit, a current sampling circuit, a second digital-analog conversion chip and a microprocessor, two input ends of the voltage sampling circuit are connected to two ends of the monitoring device respectively, the temperature acquisition circuit is installed in the interior of the monitoring device, the current sampling circuit is used for acquiring the working current of the monitoring device, the voltage sampling circuit, the first analog-digital conversion chip and the microprocessor are electrically connected in sequence, the temperature acquisition circuit is electrically connected with the microprocessor, and the current sampling circuit, the second digital-analog conversion chip and the microprocessor are electrically connected in sequence.

[0008] Preferably, the voltage sampling circuit comprises resistors R1, R2, R3, R4, R5 and an operational amplifier U1.

[0009] The first end of the resistor R1 and the first end of the resistor R3 are used as two input ends of the voltage sampling circuit, the second end of the resistor R1 is connected to the inverting input end of the operational amplifier U1, the first end of the resistor R2 is connected to the inverting input end of the operational amplifier U1, the second end of the resistor R2 is connected to the output end of the operational amplifier U1, the second end of the resistor R3 is connected to the non-inverting input end of the operational amplifier U1, the first end of the resistor R4 is connected to the non-inverting input end of the operational amplifier U1, the second end of the resistor R4 is connected to the ground, the first end of the resistor R5 is connected to the output end of the operational amplifier U1, and the second end of the resistor R5 is used as the output end of the voltage sampling circuit.

[0010] Preferably, the temperature acquisition circuit comprises a power supply VCC, capacitors C1, C2, C3 and a temperature measurement chip U2.

[0011] The first end of the capacitor C1 is connected to the power supply VCC, the second end of the capacitor C1 is connected to the ground, the first end of the capacitor C2 is connected to the power supply VCC, the second end of the capacitor C2 is connected to the ground, the first end of the capacitor C3 is connected to the power supply VCC, the second end of the capacitor C3 is connected to the ground, the temperature measurement chip U2 is of the model DS18B20, the power supply end of the temperature measurement chip U2 is connected to the power supply VCC, the ground end of the temperature measurement chip U2 is connected to the ground, and the output end of the temperature measurement chip U2 is connected to the microprocessor.

[0012] Preferably, the current sampling circuit comprises resistors R6, R7, R8, R9, R10, R11, an operational amplifier U3 and a capacitor C4.

[0013] Resistor R6 is connected in series with the monitoring device, the first end of resistor R7 is connected to the first end of resistor R6, the second end of resistor R7 is connected to the inverting input terminal of operational amplifier U3, the first end of resistor R8 is connected to the inverting input terminal of operational amplifier U3, the second end of resistor R8 is connected to the ground, the first end of resistor R9 is connected to the second end of resistor R6, the second end of resistor R9 is connected to the non-inverting input terminal of operational amplifier U3, the first end of resistor R10 is connected to the non-inverting input terminal of operational amplifier U3, the second end of resistor R10 is connected to the output terminal of operational amplifier U3, the first end of resistor R11 is connected to the output terminal of operational amplifier U3, the second end of resistor R11 is used as the output terminal of the current sampling circuit, the first end of capacitor C4 is connected to the second end of resistor R11, and the second end of capacitor C4 is connected to the ground.

[0014] As preferred, an alarm circuit is further included, which is electrically connected with the microprocessor, and the alarm circuit comprises a buzzer and a display lamp.

[0015] As preferred, a communication chip is further included, which is signal connected with the microprocessor.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] The utility model discloses a voltage sampling circuit, temperature acquisition circuit and current sampling circuit are set up, can respectively to the voltage, temperature and current of monitoring device real -time acquisition, realize the multidimensional comprehensive monitoring of monitoring device working condition, and timely discover potential fault hidden danger, and the practicality is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is whole structure schematic diagram of utility model;

[0019] Figure 2 It is circuit diagram of voltage sampling circuit in utility model;

[0020] Figure 3 It is circuit diagram of temperature acquisition circuit in utility model;

[0021] Figure 4 It is circuit diagram of current sampling circuit in utility model;

[0022] In the drawing:

[0023] 1, monitoring device;

[0024] 2, voltage sampling circuit;

[0025] 3, first analog-digital conversion chip;

[0026] 4, temperature acquisition circuit;

[0027] 5, current sampling circuit;

[0028] 6, second digital-analog conversion chip;

[0029] 7, microprocessor;

[0030] 8, alarm circuit;

[0031] 9, communication chip. DETAILED DESCRIPTION

[0032] The technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Please refer to Figures 1-4 The present application provides technical solutions:

[0034] The fault detection circuit of the security monitoring system comprises a monitoring device 1, a voltage sampling circuit 2, a first analog-digital conversion chip 3, a temperature acquisition circuit 4, a current sampling circuit 5, a second digital-analog conversion chip 6 and a microprocessor 7. The two input ends of the voltage sampling circuit 2 are connected to the two ends of the monitoring device 1. The temperature acquisition circuit 4 is installed inside the monitoring device 1. The current sampling circuit 5 is used to acquire the working current of the monitoring device 1. The voltage sampling circuit 2, the first analog-digital conversion chip 3 and the microprocessor 7 are electrically connected in sequence. The temperature acquisition circuit 4 is electrically connected to the microprocessor 7. The current sampling circuit 5, the second digital-analog conversion chip 6 and the microprocessor 7 are electrically connected in sequence. The microprocessor 7 can use a common single-chip microcomputer. The first analog-digital conversion chip 3 and the second digital-analog conversion chip 6 need to be selected according to the needs. By acquiring the voltage, current and temperature of the monitoring device 1 when it is working, the working condition of the monitoring device 1 can be understood in time, which is convenient for troubleshooting when the monitoring device 1 has a problem, and the practicability is stronger.

[0035] In the present embodiment, the voltage sampling circuit 2 comprises resistors R1, R2, R3, R4, R5 and an operational amplifier U1.

[0036] The first end of the resistor R1 and the first end of the resistor R3 are respectively two input ends of the voltage sampling circuit 2, the second end of the resistor R1 is connected to the inverting input end of the operational amplifier U1, the first end of the resistor R2 is connected to the inverting input end of the operational amplifier U1, the second end of the resistor R2 is connected to the output end of the operational amplifier U1, the second end of the resistor R3 is connected to the non-inverting input end of the operational amplifier U1, the first end of the resistor R4 is connected to the non-inverting input end of the operational amplifier U1, the second end of the resistor R4 is connected to the ground, the first end of the resistor R5 is connected to the output end of the operational amplifier U1, and the second end of the resistor R5 is an output end of the voltage sampling circuit 2. The voltage sampling circuit 2 is a differential proportional amplification circuit, obtains the voltage when the equipment works, and then converts the analog signal into a digital signal through the first analog-digital conversion chip 3, so as to facilitate the microprocessor 7 to process.

[0037] Specifically, the temperature acquisition circuit 4 includes a power supply VCC, capacitors C1, C2 and C3, and a temperature measurement chip U2.

[0038] The first end of the capacitor C1 is connected to the power supply VCC, the second end of the capacitor C1 is connected to the ground, the first end of the capacitor C2 is connected to the power supply VCC, the second end of the capacitor C2 is connected to the ground, the first end of the capacitor C3 is connected to the power supply VCC, the second end of the capacitor C3 is connected to the ground, the temperature measurement chip U2 is a DS18B20, the power supply end of the temperature measurement chip U2 is connected to the power supply VCC, the ground end of the temperature measurement chip U2 is connected to the ground, the output end of the temperature measurement chip U2 is connected to the microprocessor 7, the temperature measurement chip U2 is installed at a position close to the main heat generating components inside the monitoring equipment 1, such as the battery and the chip position, the temperature measurement chip U2 can measure the temperature in real time, and the temperature data is transmitted to the microprocessor 7 in the form of a digital signal through the output end, and the capacitors C1, C2 and C3 are all filter capacitors.

[0039] Further, the current sampling circuit 5 includes resistors R6, R7, R8, R9, R10, R11, an operational amplifier U3 and a capacitor C4.

[0040] The resistor R6 is connected in series with the monitoring equipment 1, the first end of the resistor R7 is connected to the first end of the resistor R6, the second end of the resistor R7 is connected to the inverting input end of the operational amplifier U3, the first end of the resistor R8 is connected to the inverting input end of the operational amplifier U3, the second end of the resistor R8 is connected to the ground, the first end of the resistor R9 is connected to the second end of the resistor R6, the second end of the resistor R9 is connected to the non-inverting input end of the operational amplifier U3, the first end of the resistor R10 is connected to the non-inverting input end of the operational amplifier U3, the second end of the resistor R10 is connected to the output end of the operational amplifier U3, the first end of the resistor R11 is connected to the output end of the operational amplifier U3, the second end of the resistor R11 is an output end of the current sampling circuit 5, the first end of the capacitor C4 is connected to the second end of the resistor R11, and the second end of the capacitor C4 is connected to the ground. The resistor R6 is used as a sampling resistor. Taking the camera as an example, when the current enters the camera from the power supply, the sampling resistor R6 is connected in series in the power supply input path, so that the current flowing through the camera passes through the sampling resistor.

[0041] It is worth mentioning that the alarm circuit 8 is also included, the alarm circuit 8 is electrically connected with the microprocessor 7, the alarm circuit 8 includes a buzzer and a display lamp, the microprocessor 7 can output a high level to control the corresponding buzzer and display lamp to work, and a triode or MOS tube can also be used as a switch tube.

[0042] It is worth noting that the communication chip 9 is also included, the communication chip 9 is signal connected with the microprocessor 7, and the communication chip 9 can use WiFi, 4G and 5G and other communication modules.

[0043] The fault detection circuit of the security monitoring system is used, the monitoring device 1 is working, the voltage sampling circuit 2 obtains the working voltage of the monitoring device 1, the current sampling circuit 5 obtains the working current of the monitoring device 1, the temperature acquisition circuit 4 obtains the working temperature of the monitoring device 1, the analog signals obtained by the voltage sampling circuit 2 and the current sampling circuit 5 are converted into digital signals by the first analog-digital conversion chip 3 and the second digital-analog conversion chip 6, the temperature acquisition circuit 4 can directly obtain the temperature digital signal, then the data is processed by the microprocessor 7, for example, whether the data is in the normal interval, when the abnormality occurs, the alarm circuit 8 sends an alarm, and the communication chip 9 can also send data remotely.

[0044] The above shows and describes the basic principle, main features and advantages of the utility model. The skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only preferred examples of the utility model, and are not used to limit the utility model, under the premise of not departing from the spirit and scope of the utility model, the utility model will also have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed to be protected. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A fault detection circuit for a security monitoring system, comprising a monitoring device (1), a voltage sampling circuit (2), a first analog-to-digital converter chip (3), a temperature acquisition circuit (4), a current sampling circuit (5), a second digital-to-analog converter chip (6), and a microprocessor (7), characterized in that: Two inputs of the voltage sampling circuit (2) are connected to two ends of the monitoring device (1) respectively, the temperature acquisition circuit (4) is installed in the monitoring device (1), the current sampling circuit (5) is used for acquiring working current of the monitoring device (1), the voltage sampling circuit (2), the first analog-digital conversion chip (3) and the microprocessor (7) are electrically connected in sequence, the temperature acquisition circuit (4) is electrically connected with the microprocessor (7), and the current sampling circuit (5), the second digital-analog conversion chip (6) and the microprocessor (7) are electrically connected in sequence.

2. The fault detection circuit of the security surveillance system of claim 1, wherein: The voltage sampling circuit (2) comprises resistors R1, R2, R3, R4, R5 and an operational amplifier U1. The first end of the resistor R1 and the first end of the resistor R3 are used as two inputs of the voltage sampling circuit (2) respectively, the second end of the resistor R1 is connected to the inverting input end of the operational amplifier U1, the first end of the resistor R2 is connected to the inverting input end of the operational amplifier U1, the second end of the resistor R2 is connected to the output end of the operational amplifier U1, the second end of the resistor R3 is connected to the non-inverting input end of the operational amplifier U1, the first end of the resistor R4 is connected to the non-inverting input end of the operational amplifier U1, the second end of the resistor R4 is connected to the ground, the first end of the resistor R5 is connected to the output end of the operational amplifier U1, and the second end of the resistor R5 is used as the output end of the voltage sampling circuit (2).

3. The fault detection circuit of the security surveillance system of claim 1, wherein: The temperature acquisition circuit (4) comprises a power supply VCC, capacitors C1, C2, C3 and a temperature measurement chip U2. The first end of the capacitor C1 is connected to the power supply VCC, the second end of the capacitor C1 is connected to the ground, the first end of the capacitor C2 is connected to the power supply VCC, the second end of the capacitor C2 is connected to the ground, the first end of the capacitor C3 is connected to the power supply VCC, the second end of the capacitor C3 is connected to the ground, the temperature measurement chip U2 is of the model DS18B20, the power supply end of the temperature measurement chip U2 is connected to the power supply VCC, the ground end of the temperature measurement chip U2 is connected to the ground, and the output end of the temperature measurement chip U2 is connected to the microprocessor (7).

4. The fault detection circuit of the security surveillance system of claim 1, wherein: The current sampling circuit (5) comprises resistors R6, R7, R8, R9, R10, R11, an operational amplifier U3 and a capacitor C4. The resistor R6 is connected in series with the monitoring device (1), the first end of the resistor R7 is connected to the first end of the resistor R6, the second end of the resistor R7 is connected to the inverting input end of the operational amplifier U3, the first end of the resistor R8 is connected to the inverting input end of the operational amplifier U3, the second end of the resistor R8 is connected to the ground, the first end of the resistor R9 is connected to the second end of the resistor R6, the second end of the resistor R9 is connected to the non-inverting input end of the operational amplifier U3, the first end of the resistor R10 is connected to the non-inverting input end of the operational amplifier U3, the second end of the resistor R10 is connected to the output end of the operational amplifier U3, the first end of the resistor R11 is connected to the output end of the operational amplifier U3, the second end of the resistor R11 is used as the output end of the current sampling circuit (5), the first end of the capacitor C4 is connected to the second end of the resistor R11, and the second end of the capacitor C4 is connected to the ground.

5. The fault detection circuit of the security surveillance system of claim 1, wherein: Further comprising an alarm circuit (8), the alarm circuit (8) is electrically connected with the microprocessor (7), and the alarm circuit (8) comprises a buzzer and a display lamp.

6. The fault detection circuit of the security surveillance system of claim 1, wherein: Also included is a communication chip (9) in signal connection with the microprocessor (7).

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