CN210985631U

CN210985631U - Monitoring equipment

Info

Publication number: CN210985631U
Application number: CN201921496810.5U
Authority: CN
Inventors: 陈亚
Original assignee: Du Huaiyong
Current assignee: Du Huaiyong
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-07-10
Anticipated expiration: 2029-09-09

Abstract

The embodiment of the application provides monitoring equipment. The monitoring device includes: the trip unit, the processor and the AND gate chip; the release comprises a zero-crossing detection circuit and an open circuit control circuit; the output end of the zero-crossing detection circuit is connected with the processor and the AND gate chip, the input end of the zero-crossing detection circuit is used for being connected with a first power supply, and the first power supply is an alternating current power supply; the processor is connected with the AND gate chip; the AND gate chip is connected with the open circuit control circuit; the zero-crossing detection circuit is used for sending a zero-crossing signal to the processor and the AND gate chip, wherein the zero-crossing signal represents a signal of the alternating current signal when the alternating current signal passes through zero; the processor is used for receiving the zero-crossing signal and sending a first control signal to the AND gate chip; and the AND gate chip is used for sending a switching signal to the circuit breaking control circuit according to the first control signal and the zero-crossing signal so that the circuit breaking control circuit performs switching operation under the action of the switching signal. Therefore, the problem of short service life of the circuit protection component in the prior art can be solved.

Description

Monitoring equipment

Technical Field

The application relates to the field of electric appliance protection, in particular to a monitoring device.

Background

Currently, some circuits are provided with circuit breaking protection components to control the power supply of other devices or loads.

However, in real life, the circuit breaking protection component in the circuit often causes short service life of internal devices due to arcing problem, and further affects the operation of the whole circuit system.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a monitoring device, so as to solve the problem of short service life of the trip protection component in the prior art.

The embodiment of the application provides a monitoring device, the monitoring device includes: the trip unit, the processor and the AND gate chip;

the tripper comprises a zero-crossing detection circuit and an open circuit control circuit;

the output end of the zero-crossing detection circuit is connected with the processor and the AND gate chip, the input end of the zero-crossing detection circuit is used for being connected with a first power supply, and the first power supply is an alternating current power supply;

the processor is connected with the AND gate chip;

the AND gate chip is connected with the circuit breaking control circuit;

the zero-crossing detection circuit is used for sending a zero-crossing signal to the processor and the AND gate chip, wherein the zero-crossing signal represents a signal of an alternating current signal when the alternating current signal crosses zero;

the processor is used for receiving the zero-crossing signal and sending a first control signal to the AND gate chip;

and the AND gate chip is used for sending a switching signal to the circuit breaking control circuit according to the first control signal and the zero-crossing signal so that the circuit breaking control circuit performs switching operation under the action of the switching signal.

Through the monitoring equipment, the zero-crossing detection circuit for detecting the time of the signal zero crossing point of the first power supply is additionally arranged, the zero-crossing signal output by the zero-crossing detection circuit is simultaneously sent to the processor and the AND gate chip, the processor can determine the time for sending the first control signal according to the zero-crossing signal, and the first control signal can be a power-off signal or a power supply signal. The open circuit control circuit can perform switching operation according to the first control signal and a switching signal output by the zero-crossing signal through the AND gate chip. Because the zero-crossing signal is generated when the alternating current signal of the first power supply crosses the zero point, compared with a mode of switching when the alternating current signal does not cross the zero point, the switching operation is carried out by the circuit-breaking control circuit when the alternating current signal does not cross the zero point, so that the voltage between the contacts of the device in the circuit-breaking control circuit is small, the electric arc is restrained, the service life of the circuit-breaking control circuit and even the service life of the whole monitoring equipment are prolonged, and the normal operation of the whole circuit system is facilitated.

In one possible design, the zero-crossing detection circuit includes a zero-crossing comparison circuit, an isolation circuit;

the input end of the zero-crossing comparison circuit is connected with the first power supply, and the output end of the zero-crossing comparison circuit is connected with the isolation circuit;

the isolation circuit is connected with the processor and the AND gate chip;

the zero-crossing comparison circuit is used for outputting a zero-crossing comparison signal, and the zero-crossing comparison signal is transmitted to the processor and the AND gate chip through the isolation circuit.

In the implementation process, the zero-crossing comparison circuit can detect the zero-crossing point occurrence time of the output signal of the first power supply and output a zero-crossing comparison signal when the zero-crossing point occurs. The isolation circuit can realize signal isolation and avoid mutual interference among all circuits, so that the processor and the AND gate chip can receive the zero-crossing comparison signal.

In one possible design, the circuit breaking control circuit comprises a first switch tube and a relay;

the control end of the first switch tube is connected with the AND gate chip, and the output end of the first switch tube is connected with the relay;

the relay is connected with the first power supply;

the first switch tube is used for receiving a switching signal sent by the AND gate chip and controlling the relay to be powered on or powered off according to the switching signal.

In the implementation process, the first switch tube can control the relay to be powered on or powered off according to the switching signal output by the AND gate chip, so that switching operation is achieved, overlarge voltage between contacts of the relay is avoided, electric arcs can be effectively restrained, and the service life of a relay in a circuit breaking control circuit is prolonged.

In one possible design, the monitoring device further includes a second power supply including a voltage conversion circuit;

the voltage conversion circuit comprises a rectification filtering module and a conversion module;

the input end of the rectification filter module is connected with the first power supply, and the output end of the rectification filter module is connected with the conversion module;

and a first output end of the conversion module is connected with the circuit-breaking control circuit, and a second output end of the conversion module is connected with the zero-crossing detection circuit.

In the above implementation, the second power supply may serve as a main power supply of the monitoring device. The signals output by the two output ends of the conversion module can respectively and independently supply power to the circuit breaking control circuit and the zero-crossing detection circuit.

In one possible design, the second output of the conversion module is common to the output of the rectification and filtering module.

Through the implementation process, the low-voltage part and the high-voltage part are grounded, the high-voltage part is related to the first power supply, and the low-voltage part is related to the signal output by the conversion module. By connecting the high-voltage part and the low-voltage part to the ground, the conversion module can provide the working voltage for part of the devices of the high-voltage part.

In one possible design, the second power supply further includes a power down detection circuit;

the power failure detection circuit comprises a rectifier diode and an optocoupler;

the input end of the rectifier diode is connected with the first power supply, and the output end of the rectifier diode is connected with the optocoupler;

the optical coupler is connected with the processor;

the optical coupler is used for sending a power-down signal to the processor.

In the implementation process, the power failure detection circuit of the second power supply can detect whether the incoming line of the first power supply is in power failure or not, and sends a power failure signal to the processor when the power failure occurs.

In one possible design, the monitoring device further includes a third power supply;

the third power supply comprises a current limiting diode, an energy storage device, an electric quantity monitoring circuit, a second switching tube and a third switching tube;

the electric quantity monitoring circuit is connected with the energy storage device and the processor;

the processor is connected with the base of the third switching tube, the emitter of the third switching tube is grounded, the collector of the third switching tube is connected with the first output end of the conversion module, and the collector of the third switching tube is also connected with the base of the second switching tube;

a collector of the second switching tube is connected with the energy storage device, and an emitter of the second switching tube is connected with the first output end of the conversion module;

the anode of the current-limiting diode is connected with the collector of the second switching tube, and the cathode of the current-limiting diode is connected with the first output end of the conversion module;

the electric quantity monitoring circuit is used for sending an electric quantity acquisition signal to the processor.

In the implementation process, the third power supply can be used as a standby power supply of the monitoring device, and when the second power supply cannot normally supply power, the third power supply provides voltage required by the internal circuit of the monitoring device.

In one possible design, the monitoring device further comprises an identity recognition device and an alarm;

the identity recognition device and the alarm are connected with the processor;

the identity recognition device is used for acquiring the identity data of the target user and sending the acquired identity data to the processor;

and the processor is used for sending a first alarm signal to the alarm according to the identity data.

Through the implementation process, if the monitoring equipment is applied to places with confidentiality and privacy requirements, whether the target user with abnormal identity accesses the monitoring equipment can be known through the alarm.

In one possible design, the monitoring device further comprises an environment detection device and an alarm;

the environment detection device and the alarm are connected with the processor;

the environment detection device is used for sending environment data to the processor;

and the processor is used for sending a second alarm signal to the alarm according to the environment data.

Through the implementation process, if the monitoring equipment is applied to a place with a complex environment, whether the monitoring area corresponding to the environment detection device has an environmental threat or not can be known through the alarm.

In one possible design, the monitoring device further comprises a communication device;

the communication device is connected with the processor and also connected with external equipment;

the processor is used for receiving the expense query instruction and the parameter modification instruction sent by the external equipment through the communication device.

Therefore, data interaction between the monitoring equipment and the external equipment can be realized through the communication device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a block diagram of a monitoring device according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram of a zero-crossing detection circuit provided in an embodiment of the present application.

Fig. 3 is a schematic diagram of a circuit breaking control circuit according to an embodiment of the present disclosure.

Fig. 4 is a schematic diagram of a second power supply provided in an embodiment of the present application.

Fig. 5 is a schematic diagram of a third power supply provided in an embodiment of the present application.

Fig. 6 is a functional structure block diagram of another monitoring device provided in the embodiment of the present application.

Icon: 10-a monitoring device; 100-a release; 110-zero crossing detection circuit; 111-zero crossing comparison circuitry; 112-an isolation circuit; 120-open circuit control circuit; 200-a processor; 300-and gate chip; 400-a second power supply; 410-a voltage conversion circuit; 411-a rectification filter module; 412-a conversion module; 420-power down detection circuitry; 500-a third power supply; 600-an identity recognition device; 700-alarm; 800-an environment detection device; 900 — communication device.

Detailed Description

The technical solution in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

The embodiment of the application provides a monitoring device 10, and the monitoring device 10 can be applied to places needing circuit protection. For example, the method can be applied to places such as individual houses, rental houses, office buildings, production workshops and research institutes.

Referring to fig. 1, fig. 1 is a block diagram of a monitoring device 10 according to an embodiment of the present disclosure.

The monitoring device 10 comprises: tripper 100, processor 200, and gate chip 300.

Two input ends of a release 100 in the monitoring device 10 are respectively connected with a live wire and a zero line of a first power supply, two output ends of the release 100 are respectively connected with a live wire and a zero line of an outgoing wire of the first power supply, and the power supply and the power outage of the first power supply to other loads can be switched through the output end of the release 100. The other load is a load under the first power source.

The trip unit 100 includes a zero crossing detection circuit 110 and a trip control circuit 120.

The output terminal of the zero-crossing detection circuit 110 is connected to the processor 200 and also connected to the and chip 300. The input terminal of the zero-crossing detection circuit 110 is used for connecting a first power supply. The processor 200 is connected to the and chip 300, and the and chip 300 is connected to the disconnection control circuit 120.

Wherein the first power source may be an ac power source capable of outputting ac power. For example, the first power source may be a 220V ac power source. The signal output by the first power supply may be a sinusoidal signal or may be other irregular signals with the direction of the electrical signal changing continuously.

The zero-crossing detection circuit 110 is configured to send a zero-crossing signal to the processor 200 and the and chip 300, where the zero-crossing signal indicates that the ac signal is zero-crossing and is generated at the zero-crossing time. For example, the zero crossing signal may represent a signal output by the zero crossing detection circuit 110 when detecting that a polarity inversion will occur in the voltage of the 220V line-hot line.

And the processor 200 is configured to receive the zero-crossing signal and send a first control signal to the and gate chip 300.

The first control signal may be a power-off signal or a power-on signal, and the first control signal may be a signal output by the processor 200 according to another detection circuit connected to the processor 200 or a signal output by receiving a switching request initiated by a user. The switch request may be sent remotely or may be initiated by a mechanical component such as a button, valve, etc. connected to processor 200.

And the and gate chip 300 is configured to send a switching signal to the circuit break control circuit 120 according to the first control signal and the zero crossing signal, so that the circuit break control circuit 120 performs a switching operation under the action of the switching signal.

In this embodiment, the and gate chip 300 may be a chip independent from the processor 200. In other embodiments, the and gate chip 300 may implement corresponding logic functions by a software device or a program. The processor 200 may be a single chip microcomputer, which has a small size and can reduce the size of the whole monitoring device 10.

The timing of the switching operation can be determined by the zero-crossing signal, the switching operation of the power-off or power-on can be determined by the first control signal, and the first control signal is a signal which is sent after the processor 200 receives the zero-crossing signal.

It should be noted that the internal power supply of the monitoring device 10 itself is independent. Therefore, even if the circuit-breaking control circuit 120 cuts off the power supply from the first power source to other loads, the monitoring device 10, which is independently powered inside, can switch the first power source through the circuit-breaking control circuit 120, so that the first power source can resume the power supply to other loads.

With the monitoring device 10, since the zero-crossing detection circuit 110 for detecting the zero-crossing point of the first power supply is additionally provided, and the zero-crossing signal output by the zero-crossing detection circuit 110 is simultaneously sent to the processor 200 and the and gate chip 300, the processor 200 can determine the time for sending the first control signal according to the zero-crossing signal. The disconnection control circuit 120 may perform a switching operation by the and chip 300 according to the first control signal and a switching signal output by the zero-crossing signal. Since the zero-crossing signal is generated when the ac signal of the first power supply crosses zero, the switching operation of the trip control circuit 120 at the zero-crossing point can make the voltage between the device contacts inside the trip control circuit 120 smaller, thereby suppressing the arcing, extending the lifetime of the trip control circuit 120 and even the entire monitoring device 10, and facilitating the normal operation of the entire circuit system, compared to the switching operation at the non-zero-crossing point.

It can be understood that in a practical application scenario, the signal change speed of the first power supply is very fast, the time required from the voltage extreme value of the first power supply to the voltage zero-crossing point is very short, and even if the zero-crossing signal is introduced to determine the timing of the switching operation, the result of the switching operation is not affected.

Alternatively, as shown in fig. 2, the zero-cross detection circuit 110 includes a zero-cross comparison circuit 111 and an isolation circuit 112.

The input terminal of the zero-cross comparison circuit 111 is connected to the first power supply, and the output terminal of the zero-cross comparison circuit 111 is connected to the isolation circuit 112. The isolation circuit 112 is connected to the processor 200 and also connected to the and chip 300.

And the zero-crossing comparison circuit 111 is configured to output a zero-crossing comparison signal, and the zero-crossing comparison signal is transmitted to the processor 200 and the and gate chip 300 through the isolation circuit 112.

The zero-cross comparison circuit 111 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D1, a second diode D2, an operational amplifier, and a first capacitor C1.

One end of the first resistor R1 is connected to the line-hot line of the first power supply, and the other end is connected to the clamp circuit formed by the first diode D1 and the second diode D2. One end of the second resistor R2 is connected with the zero line, and the other end is connected with the clamping circuit.

The operational amplifier comprises a first amplifier U1A and a second amplifier U1B. The output of the second amplifier U1B is connected to the input of the first amplifier U1A. The first amplifier U1A and the second amplifier U1B may be packaged in the same operational amplifier chip. The operational amplifier includes eight pins. The second pin and the third pin are grounded through a third resistor R3 and a fourth resistor R4, respectively. The fourth pin is grounded. The eighth pin is connected to the first fixed voltage and is also connected to ground through a first capacitor C1. The first fixed voltage may have a value of 5V. The fifth pin is connected to the first pin of the first amplifier U1A, the sixth pin is connected to the seventh pin, and the seventh pin serves as the output of the operational amplifier and is connected to the isolation circuit 112. The first amplifier U1A is configured to output a zero-crossing comparison signal according to a signal variation of the first power source. The second amplifier U1B is a voltage follower with isolation.

The isolation circuit 112 includes a fifth resistor R5 and a photo coupler U2. The fifth resistor R5 can be considered as a current limiting resistor. The input side of the photocoupler U2 is connected to the output end of the zero-cross comparison circuit 111 through a fifth resistor R5, and the output side is connected to the processor 200 and the and chip 300. The photocoupler U2 couples the zero-crossing comparison signal of the high voltage part to the processor 200 of the low voltage side, and gate chip 300 through the terminal "b" in fig. 2.

Through the implementation process, the zero-crossing comparison circuit 111 can detect the zero-crossing point occurrence time of the output signal of the first power supply, and output the zero-crossing comparison signal when the zero-crossing point occurs. The isolation circuit 112 can achieve signal isolation to avoid mutual interference between the circuits, so that the processor 200 and the and gate chip 300 can receive the zero-crossing comparison signal.

As an embodiment, when the processor 200 reads that the zero-cross comparison signal is at a low level, the processor sends out the first control signal, so that the circuit breaking control circuit 120 performs a switching operation when the voltage crosses zero, thereby preventing contacts of devices inside the circuit breaking control circuit 120 from being damaged due to arc discharge, prolonging the service life, and improving the stability of the whole circuit system.

Alternatively, as shown in fig. 3, the disconnection control circuit 120 may include a first switching tube Q1, a relay K1, a sixth resistor R6, and a third diode D3.

The control end of the first switch tube Q1 is connected with the and chip 300, and the output end of the first switch tube Q1 is connected with the relay K1. The relay K1 is connected to the first power source.

The first switch tube Q1 is used for receiving the switching signal sent by the and gate chip 300 and controlling the relay K1 to be powered on or powered off according to the switching signal.

If the first switch Q1 is a triode. The base of the first switch tube Q1 is connected with the output end of the and chip 300 through a sixth resistor R6, the emitter is grounded, the collector is connected with the relay K1, and the collector is connected with a second fixed voltage through a third diode D3. The value of the second fixed voltage may be 12V. The "c" terminal in fig. 3 is used for receiving the switching signal output by the and gate chip 300.

The relay K1 includes a first contact, a second contact, a third contact, a fourth contact, and a fifth contact. The first contact and the second contact are connected with a coil in the relay K1, the first contact is connected with a second fixed voltage, and the second contact is connected with a first switch tube Q1. The third contact and the fourth contact are respectively connected with an incoming line and an outgoing line of the first power supply, and the fifth contact is suspended. When the relay K1 is powered off, the single-pole double-throw switch in the relay K1 is switched from the state where the third contact and the fourth contact are connected to the state where the third contact and the fifth contact are connected, so that the connection between the incoming line and the outgoing line of the first power supply is cut off, and the power off is realized.

A person skilled in the art can set the electrical relationship between the coil and the single-pole double-throw switch according to actual needs, so that under the control action of the first switching tube Q1, the coil in the relay K1 can be switched between a power-on state and a power-off state, thereby changing the connection state of the single-pole double-throw switch and realizing switching operation.

Through the structure, the first switch tube Q1 can control the relay K1 to be electrified or deenergized according to the switching signal output by the AND gate chip 300, so that the switching operation is realized, and because the switching signal is the signal output according to the zero-crossing signal, when the relay K1 performs the switching operation, the voltage between the contacts of the relay K1 can be prevented from being overlarge, the electric arc can be effectively inhibited, and the service life of the relay K1 in the circuit breaking control circuit 120 is prolonged.

Optionally, the monitoring device 10 may further include an overload detection circuit connected to the processor 200, and the overload detection circuit may be connected to other loads to obtain power from other load devices. The overload detection circuit sends the electrical signal collected from the load to the processor 200, and when the processor 200 reads that the actual voltage of the load is lower than a set value, a low-voltage alarm signal is sent. When the processor 200 reads that the actual voltage is higher than another set value, an overvoltage alarm signal is issued. When the processor 200 reads that the actual power is greater than another set value, it sends an overload alarm signal, and when it receives a zero-crossing signal, it sends a first control signal to the and gate chip 300. The overload detection circuit may be designed by a person skilled in the art according to actual needs, and other detection circuits may be used to replace the overload detection circuit to enable the processor 200 to output the first control signal, and the specific details of the overload detection circuit should not be taken as a limitation to the present application.

Optionally, as shown in fig. 4, the monitoring device 10 may further include a second power supply 400, and the second power supply 400 may include a voltage conversion circuit 410 and a power failure detection circuit 420.

The voltage converting circuit 410 includes a rectifying and filtering module 411 and a converting module 412.

The input end of the rectifying and filtering module 411 is connected to the first power supply, and the output end of the rectifying and filtering module 411 is connected to the converting module 412. A first output terminal of the converting module 412 is connected to the open circuit control circuit 120, and a second output terminal of the converting module 412 is connected to the zero-crossing detecting circuit 110.

The rectifying and filtering circuit comprises a fuse F1, a voltage dependent resistor Z1, a thermistor NT1, a second capacitor C2, a rectifier bridge DB1 and a third capacitor C3. One end of the fuse F1 is connected with the incoming line-live wire of the first power supply, and the other end is connected with one input end of the rectifier bridge DB 1. The other input end of the rectifier bridge DB1 is connected with the zero line through a thermistor NT 1. The piezoresistor Z1 is connected between the end of the fuse F1 far away from the live wire and the neutral wire in a bridge. The second capacitor C1 is connected across the two input terminals of the rectifier bridge DB 1. The third capacitor C3 is connected across the two output terminals of the rectifier bridge DB1, and the negative terminal of the third capacitor C3 is grounded. The second capacitor C2 may implement filtering before rectification and the third capacitor C3 may implement filtering after rectification.

The conversion module 412 may be a DC-DC chip U3 capable of converting power of one voltage value to power of another voltage value in a DC circuit. In some examples, the conversion module 412 may also be an off-the-shelf switching power supply module for performing power conversion. In this embodiment, the conversion module 412 may include at least two sets of output terminals to output a plurality of independent power signals, so as to supply power to different devices. In one example, the conversion module 412 can output 12V, 5V dc signals, which can supply power to corresponding devices in the zero-crossing detection circuit 110 and the open-circuit control circuit 120. It can be understood that, if there are devices in the monitoring device 10 that require other voltages to supply power, the converting module 412 may be set according to actual needs to meet the requirement of the operating voltage, so that the converting module 412 can output voltages of 3.3V, 1.5V, and the like. In order to meet more power requirements, a linear regulator may be further disposed at the output end of the conversion module 412, for example, a 12V voltage may be converted into a 3.3V voltage by the linear regulator for supplying power.

Through the implementation process described above, the second power supply 400 may serve as a main power supply of the monitoring apparatus 10. The signals output by the two output terminals of the conversion module 412 can independently power the internal devices of the open-circuit control circuit 120 and the zero-crossing detection circuit 110.

Alternatively, the second output terminal of the converting module 412 may be common to the output terminal of the rectifying and filtering module 411. The ground labeled "EARTH" in fig. 4 represents the ground of the high-voltage portion.

If the voltage of 5V is output from the second output terminal, the 5V signal output from the voltage conversion circuit 410 can provide 5V working voltage for the circuit of the high-voltage part, and no additional power supply is needed to be provided for the high-voltage part, thereby simplifying the circuit structure. And the signal isolation of the first output end and the second output end can be realized, and the 12V signal which is not grounded with the high-voltage part can be used as a main power supply of the low-voltage part because the 12V power supply signal is isolated from the voltage of the high-voltage part through the DC-DC chip.

This allows the low voltage portion to be common to the high voltage portion, the high voltage portion being associated with the first power source and the low voltage portion being associated with the signal output by the conversion module 412. By connecting the high voltage part and the low voltage part to the ground, the switching module 412 can provide the operating voltage for the parts of the high voltage part.

Optionally, the power down detection circuit 420 may include a rectifying diode D4, an optocoupler U4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a fourth capacitor C4.

The input end of the rectifier diode D4 is connected with the first power supply, the output end of the rectifier diode D4 is connected with the optocoupler U4, and the optocoupler U4 is connected with the processor 200. The optocoupler U4 is used to send a power down signal to the processor 200.

The first input end of the optocoupler U4 is connected with the rectifier diode D4, the second input end of the optocoupler U4 is connected with a zero line through a sixth resistor R6 and a seventh resistor R7 which are mutually connected in series, the first output end of the optocoupler U4 is connected with the processor 200, and the second output end of the optocoupler U4 is grounded. The eighth resistor R8 is connected in parallel with the fourth capacitor C4 to form a filter circuit, and the filter circuit is connected across two output ends of the optocoupler U4. The "d" terminal in fig. 4 is used to send a power down signal to the processor 200.

Through the above structure, the power-down detection circuit 420 can detect whether the incoming line of the first power supply is powered down, and send a power-down signal to the processor 200 when the power-down condition occurs.

Optionally, as shown in fig. 5, the monitoring device 10 may further include a third power supply 500. The third power supply 500 may include a current limiting diode D5, an energy storage device B1, a power monitoring circuit, a second switch tube Q2, and a third switch tube Q3. The energy storage device B1 may be a battery.

The power monitoring circuit is connected with the energy storage device B1 and also connected with the processor 200. The power monitoring circuit is configured to send a power acquisition signal to the processor 200.

The power monitoring circuit may include a ninth resistor R9 and a tenth resistor R10, the ninth resistor R9 is connected in series with the tenth resistor R10, and a node (end "e" in fig. 5) where the ninth resistor R9 is connected with the tenth resistor R10 is used to send the power collection signal to the processor 200.

The processor 200 is connected to the base of the third transistor Q3, for example, may be connected to the base of the third transistor Q3 through a thirteenth resistor R13. The emitter of the third switching tube Q3 is grounded. The collector of the third switch Q3 is connected to the first output terminal of the converting module 412 through a twelfth resistor R12, for example, the collector of the third switch Q3 may receive a 12V signal through the twelfth resistor R12.

The collector of the third switch transistor Q3 is connected to the base of the second switch transistor Q2, for example, the collector of the third switch transistor Q3 may be connected to the base of the second switch transistor Q2 through an eleventh resistor R11. The collector of the second switch Q2 is connected to the energy storage device B1 and to the end of the ninth resistor R9 away from the tenth resistor R10. The emitter of the second switching transistor Q2 is connected to the first output terminal of the converting module 412. The terminal "f" in fig. 5 is used to receive the charging control signal sent by the processor 200.

The anode of the current limiting diode D5 is connected to the collector of the second switch Q2, and the cathode is connected to the first output terminal of the converting module 412.

Take the example that the first output terminal of the converting module 412 outputs 12V. When the 12V main power signal output by the conversion module 412 is normally powered, the processor 200 monitors the power of the energy storage device B1 through the power monitoring circuit. When the fact that the electric quantity of the energy storage device B1 is reduced to the lower limit set value is monitored, the processor 200 sends a charging control signal to the third switching tube Q3, so that the third switching tube Q3 is turned on or off, the collector voltage of the third switching tube Q3 can be changed by turning on or off the third switching tube Q3, the base voltage of the second switching tube Q2 is further changed, switching control over the second switching tube Q2 is achieved, and therefore a main power supply signal of 12V can charge the energy storage device B1 through the second switching tube Q2.

Similarly, when the electric quantity of the energy storage device B1 is monitored to reach the upper limit set value, the third switching tube Q3 is controlled to switch the on state, so that the charging process of the energy storage device B1 is finished. When the 12V main power output by the converting module 412 is powered off, the energy storage device B1 supplies power to other devices connected to the first output terminal of the converting module 412 through the current limiting diode D5, for example, when the second power supply 400 cannot output a 12V main power signal, the energy storage device B1 of the third power supply 500 supplies power to the circuit-breaking control circuit 120 through the current limiting diode D5.

In general, if the processor is directly connected to the second switching tube Q2, the signal voltage output by the processor may not be able to reliably turn on or off the second switching tube Q2 due to the small signal voltage output by the processor itself, and the base voltage of the second switching tube Q2 can be reliably switched between the first output terminal voltage (12V) of the converting module 412 and the ground voltage as much as possible by the third switching tube Q3 connected to the processor, so that the second switching tube Q2 can be reliably turned on or off.

As an embodiment, the processor 200 may know whether a power failure occurs through a power failure signal, and when the power failure occurs, the second power supply 400 may not output a 12V signal normally, and at this time, the third power supply 500 may supply power to the circuits of the low voltage part instead of the second power supply 400.

Through the implementation process, the third power supply 500 can be used as a backup power supply for the monitoring device 10, and when the second power supply 400 cannot supply power normally, the third power supply 500 provides the voltage required by the internal circuits of the monitoring device 10. In addition, the electric quantity monitoring of the third power supply 500 can be realized through the electric quantity monitoring circuit, and the charging process of the third power supply 500 is controllable through the cooperation of the electric quantity monitoring circuit, the third switch tube Q3, the second switch tube Q2 and the processor 200.

Optionally, as shown in fig. 6, the monitoring device 10 may also include an alarm 700. The alarm 700 is connected to the processor 200. The alarm 700 may perform sound, light, and earthquake alarms, and may also transmit an alarm message to an external device. The alarm mode of the alarm 700 can be changed by those skilled in the art according to actual needs.

The processor 200 may send an alarm signal to the alarm 700 when the power of the third power supply 500 is lower than a set lower limit alarm value, so that the alarm 700 gives an alarm prompt. The processor 200 may also send an alarm signal to the alarm 700 upon detecting a power down condition.

Each of the devices in fig. 6 may be powered by the second power supply 400 or the third power supply 500.

Optionally, the monitoring device 10 may further comprise an identification means 600. The identification device 600 is connected to the processor 200.

The identification device 600 is configured to collect the identification data of the target user and send the collected identification data to the processor 200. The processor 200 is configured to send a first alarm signal to the alarm 700 based on the identity data. The alarm 700 may issue a corresponding alarm prompt according to the first alarm signal.

The identification device 600 may be any one or a combination of a fingerprint recognition device, a facial recognition device, an iris recognition device, and an IC Card (Integrated Circuit Card).

In the implementation process, if the monitoring device 10 is applied to a place with confidentiality and privacy requirements, whether a target user with an abnormal identity accesses the monitoring device 10 can be known through the alarm 700, so that identity identification of an accessor is realized, and a user can know that the user with the abnormal identity accesses through an alarm prompt sent by the alarm 700.

Optionally, the monitoring device 10 may further comprise an environment detection means 800. The environment detection device 800 is connected to the processor 200.

The environment sensing device 800 is configured to send environmental data to the processor 200, which may include, but is not limited to, parameters related to carbon monoxide, smoke, flame, oxygen. The specific detection content of the environment detection apparatus 800 may be determined according to the selected sensor. Those skilled in the art can select the environment detection apparatus 800 and configure the parameters of the processor 200 accordingly according to actual needs, so that the processor 200 can detect whether the environment data is abnormal or not.

The processor 200 is configured to send a second alarm signal to the alarm 700 according to the environmental data, and the processor 200 may send the second alarm signal to the alarm 700 when detecting that the environmental data is abnormal, so that the alarm 700 sends an alarm prompt.

In the implementation process, if the monitoring device 10 is applied to a place with a complex environment, whether an environmental threat exists in a monitoring area corresponding to the environment detection apparatus 800 can be known through the alarm 700, and an alarm is given when the environmental threat exists.

Optionally, the monitoring device 10 may also include a communication device 900. The communication device 900 is connected to the processor 200 and also connected to an external device. The communication device 900 may include any one or more of an ethernet module, a WIFI module, an RS485 module, a ZIGBEE module, and a USB interface, so as to implement wired or wireless communication connection between the monitoring device 10 and an external device.

The processor 200 is configured to receive a fee inquiry command and a parameter modification command sent by an external device through the communication device 900. If the monitoring device 10 is installed in a rental house, the user may send a fee inquiry instruction to the monitoring device 10 through the handheld terminal, and the monitoring device 10 may perform fee inquiry according to the fee inquiry instruction and may return a fee result fed back by the external server or the third-party platform to the handheld terminal of the user. The user may also update parameters, such as changing some settings, of the processor 200 of the monitoring device 10 through an external device communicatively connected to the communication device 900. Data interaction between the monitoring device 10 and the external device can be realized through the communication device 900.

If the communication device 900 includes an RS485 module, the RS485 module can provide the working voltage through the conversion module 412. The processor 200 can be connected with external devices such as an electric energy metering device, a water flow detector, a gas consumption acquisition device and the like through the RS485 module to obtain the electricity consumption, the water consumption and the gas consumption, and the processor 200 can calculate or look up the table according to a preset calculation formula to obtain the related cost of the electricity consumption, the water consumption and the gas consumption.

If the communication device 900 includes a WIFI module, the WIFI module may be connected to the processor 200 through a Serial Peripheral Interface (SPI).

Wherein, the monitoring device 10 can also send an alarm signal to an external device through the communication device 900. For example, a corresponding alarm prompt may be sent to the external device when power failure, an abnormal identity of a visitor, and an abnormal environmental data are detected, and a prompt message may also be sent to the external device, for example, a short message is sent to perform an alarm prompt.

To sum up, the embodiment of the present application provides a monitoring device 10, can control the relay in the control circuit 120 that opens circuit under the combined action of zero cross signal and first control signal and switch the operation, for the mode that the relay switches the operation directly, switch the operation and can avoid appearing great voltage between the contact of relay at the zero cross moment of first power, can effectively restrain electric arc, improved the short defect of life because of the arc discharge problem leads to, can promote whole circuit system's stability. If the monitoring device 10 is applied to a rental housing, the release 100 in the monitoring device 10 can provide power for the power equipment in the rental housing or perform power-off control on the rental housing, and when electric leakage, overload, fire or arrearage occurs, the release 100 may be disconnected to cut off the power supply to the rental housing.

It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In the description of the present application, unless otherwise explicitly stated or limited, the terms "connected" and "connected" should be interpreted broadly, for example, directly or indirectly through an intermediate connection, or through the communication between two elements, and the specific meaning of the terms in the present application can be understood by those skilled in the art according to specific situations.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A monitoring device, characterized in that the monitoring device comprises: the trip unit, the processor and the AND gate chip;

the processor is connected with the AND gate chip;

the AND gate chip is connected with the circuit breaking control circuit;

2. The monitoring device of claim 1, wherein the zero-crossing detection circuit comprises a zero-crossing comparison circuit, an isolation circuit;

the isolation circuit is connected with the processor and the AND gate chip;

3. The monitoring device of claim 1, wherein the circuit breaking control circuit comprises a first switch tube, a relay;

the relay is connected with the first power supply;

4. The monitoring device of claim 1, further comprising a second power supply, the second power supply comprising a voltage conversion circuit;

5. The monitoring device of claim 4, wherein the second output of the conversion module is common to the output of the rectifying and filtering module.

6. The monitoring device of claim 4, wherein the second power supply further comprises a power down detection circuit;

the optical coupler is connected with the processor;

the optical coupler is used for sending a power-down signal to the processor.

7. The monitoring device of claim 4, further comprising a third power source;

8. The monitoring device of claim 1, further comprising an identification means, an alarm;

the identity recognition device and the alarm are connected with the processor;

9. The monitoring device of claim 1, further comprising an environment detection means, an alarm;

10. The monitoring device of any one of claims 1-9, further comprising a communication means;