House AC power outlet line detection system

Abstract

The present invention belongs to the technical field of house circuit detection, and in particular relates to a house AC power socket line-finding detection system, comprising a receiver and a plurality of transmitters, wherein the receiver is connected to each of the transmitters via wireless communication for controlling the working state of the transmitter via the receiver; the transmitter comprises a trigger module for accessing an AC power source and generating a line-finding signal; the receiver comprises a line-finding signal sensing module, a shaping and amplifying module, a secondary shaping module and a data sampling and processing module connected in sequence; the present application can detect the connection relationship between the socket and the circuit breaker without powering off, and does not affect the electrical equipment connected to the socket. In addition, only one person is required to complete the entire detection process, and the operation is convenient and simple, saving labor costs.

Description

Technical Field

[0001] The present application relates to the technical field of house measurement, and in particular to a house AC power socket line finding detection system. Background Art

[0002] With the advancement of power technology and the improvement of awareness of safe electricity use, the AC power wiring projects of modern houses generally use central distribution boxes to centrally manage all branch lines in the entire house. As key components in the central distribution box, leakage protectors and circuit breakers are responsible for switching control of power sockets in a certain branch and circuit safety protection. Therefore, the connection between leakage protectors and circuit breakers and power sockets scattered throughout the house constitutes the main framework of the AC power wiring diagram of the entire house.

[0003] Under normal circumstances, it is difficult for anyone other than the homeowner to quickly determine the connection between the sockets and circuit breakers inside a house. This can only be done through cooperation between two people: one person is responsible for controlling the circuit breaker at the distribution box, and the other person plugs in the electrical equipment to the socket that needs to be tested in the house as an indicator of power on. For example, when a lamp is repeatedly opened and closed by the circuit breaker, the light also turns on and off, which means that the socket is connected to the currently controlled circuit breaker; conversely, if the light does not change with the opening and closing of the circuit breaker, it means that the socket is not connected to the currently controlled circuit breaker. However, since this detection method requires repeated power on and off during operation, it will affect the normal use of power-off appliances on the line, and the detection efficiency is very low. If the house area is large, multiple people are required to cooperate to complete the test.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In view of at least one of the above technical problems, the present application provides a house AC power socket line finding detection system, which solves the problem that under normal circumstances, the power needs to be turned off to detect the connection relationship between the socket inside the house and the circuit breaker.

[0006] An embodiment of the first aspect of the present application provides a house AC power socket line finding detection system, comprising a receiver and a plurality of transmitters, wherein the receiver is connected to each transmitter via wireless communication for controlling the working state of the transmitter via the receiver;

[0007] The transmitter includes a trigger module for receiving an AC power supply and generating a line-finding signal;

[0008] The receiver includes a line-finding signal sensing module, a shaping and amplifying module, a secondary shaping module and a data sampling and processing module which are connected in sequence;

[0009] Among them, after the line-finding signal is captured by the line-finding signal sensing module, it is processed by the shaping amplifier module and the secondary shaping module to generate a sawtooth wave signal, and the sawtooth wave signal is input into the data sampling processing module, and the average voltage value of the sawtooth wave signal is calculated;

[0010] When the receiver fails to capture the line-finding signal, the average voltage value of the sawtooth wave signal is the reference voltage value;

[0011] When the receiver is close to the circuit breaker on which the line-finding signal is superimposed, a deviation voltage value is generated, and the deviation voltage value is the difference between the reference voltage value and the average voltage value of the sawtooth wave signal;

[0012] When the deviation voltage value is greater than the alarm threshold value, the receiver alarms to indicate that the currently approaching circuit breaker is the target circuit breaker.

[0013] The present application has the following technical effects: the present application can detect the connection relationship between the socket and the circuit breaker without turning off the power, and does not affect the electrical equipment connected to the socket. In addition, only one person is required to complete the entire detection process, which is convenient and simple to operate and saves labor costs.

[0014] In one implementation, the trigger module includes a trigger circuit;

[0015] The first input terminal of the trigger circuit is connected to the live wire terminal of the AC power supply, and the second output terminal of the trigger circuit is connected to the neutral wire terminal of the AC power supply.

[0016] In one implementation, the trigger circuit includes a two-phase trigger diode D1, a diode D2, a resistor R100 and a capacitor C100, one end of the two-phase trigger diode D1 is connected to the neutral line end of the AC power supply, the other end of the two-phase trigger diode D1 is connected to one end of the capacitor C100, the anode of the diode D2 is connected to the live line end of the AC power supply, the cathode of the diode D2 is connected to the other end of the capacitor C100, and the resistor R100 is connected in parallel at both ends of the capacitor C100.

[0017] In one implementation, the line-finding signal sensing module includes a signal capture circuit and a first co-directional pulse amplification circuit;

[0018] A signal capture circuit, used for receiving a line-finding signal;

[0019] A first co-directional pulse amplifying circuit, wherein the input end of the first co-directional pulse amplifying circuit is connected to the signal capturing circuit, and the output end of the first co-directional pulse amplifying circuit is connected to the shaping amplifying module.

[0020] In one implementation, the signal capture circuit includes an inductor L1, a resistor R9, a resistor R8, a capacitor C4, a capacitor C5 and a reference power supply. The first end of the resistor R8 is connected to the positive electrode of the reference power supply, the second end of the resistor R8 is connected to the first end of the resistor R9, the second end of the resistor R9 is connected to the first end of the inductor L1 through the capacitor C4, the second end of the inductor L1 is connected to the positive electrode of the reference power supply, the two ends of the capacitor C5 are respectively connected to the first end and the second end of the resistor R8, and the common end of the second end of the resistor R8 and the capacitor C5 is the output end of the signal capture circuit for connecting to the first co-directional pulse amplification circuit.

[0021] In one implementation, the first co-directional pulse amplification circuit includes an operational amplifier U3A, a capacitor C6, a resistor R10, a resistor R11 and a capacitor C7. The non-inverting input terminal of the operational amplifier U3A is connected to the signal capture circuit, the inverting input terminal of the operational amplifier U3A is connected to the resistor R10 through the capacitor C6, and the resistor R10 is grounded, the output terminal of the operational amplifier U3A is connected to the shaping amplification module, the two ends of the resistor R11 are respectively connected between the inverting input terminal of the operational amplifier U3A and the output terminal of the operational amplifier U3A, and the capacitor C7 is connected in parallel with the resistor R11.

[0022] In one implementation, the shaping and amplifying module includes a shaping circuit and a second co-directional pulse amplifying circuit; the input end of the shaping circuit is connected to the line-finding signal sensing module, and the output end of the shaping circuit is connected to the second co-directional pulse amplifying circuit, and the shaping circuit is used to output a negative triangular pulse signal to the second co-directional pulse amplifying circuit, and the output end of the second co-directional pulse amplifying circuit is connected to the secondary shaping module, and the second co-directional pulse amplifying circuit is used to output a negative triangular pulse amplified signal to the secondary shaping module.

[0023] In one implementation, the shaping circuit includes a comparator U2A, a comparator U2B, a resistor R1, a resistor R2, a resistor R3 and a capacitor C1, the non-inverting input terminal of the comparator U2A is connected to a line-finding signal sensing module, the inverting input terminal of the comparator U2A is connected to the output terminal of the comparator U2A, the first voltage terminal of the comparator U2A is connected to the output terminal of the comparator U2A through the resistor R1, the second voltage terminal of the comparator U2A is connected to the output terminal of the comparator U2A through the capacitor C1, the non-inverting input terminal of the comparator U2B is connected to a DC bias power supply, the inverting input terminal of the comparator U2B is connected to the line-finding signal sensing module through the resistor R3, the output terminal of the comparator U2B is connected to the inverting input terminal of the comparator U2B through the resistor R2, and the output terminal of the comparator U2B is connected to the output terminal of the comparator U2A to output a negative triangular pulse signal.

[0024] In one implementation, the second co-directional pulse amplification circuit includes an operational amplifier U3B, a resistor R4, a resistor R5 and a capacitor C2. The non-inverting input terminal of the operational amplifier U3B is connected to the output terminal of the shaping circuit, the inverting input terminal of the operational amplifier U3B is connected to the output terminal of the operational amplifier U3B through the resistor R5, the inverting input terminal of the operational amplifier U3B is grounded through the resistor R4, the output terminal of the operational amplifier U3B is connected to the secondary shaping module, and the capacitor C2 is connected in parallel to both ends of the resistor R5.

[0025] In one implementation, the secondary shaping module includes a comparator U1B, a resistor R6, a resistor R7 and a capacitor C3. The non-inverting input terminal of the comparator U1B is connected to the shaping amplifier module through the resistor R7, the inverting input terminal of the comparator U1B is connected to the output terminal of the comparator U1B, the output terminal of the comparator U1B is connected to the first power supply V7 through the resistor R6, the first voltage terminal of the comparator U1B is connected to the second power supply V6, the second voltage terminal of the comparator U1B is connected to the output terminal of the comparator U1B through the capacitor C3, and the output terminal of the comparator U1B is used to output a sawtooth wave signal to the data sampling and processing module.

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a schematic diagram of a house AC power socket line finding detection system in an embodiment of the present invention;

[0029] Figure 2 is a circuit diagram of a trigger module in an embodiment of the present invention;

[0030] Figure 3 is a circuit diagram of a line-finding signal sensing module in an embodiment of the present invention;

[0031] Figure 4 is a circuit diagram of a shaping and amplifying module in an embodiment of the present invention;

[0032] Figure 5 is a circuit diagram of a secondary shaping module in an embodiment of the present invention;

[0033] Figure 6 Schematic diagram of wireless connection between a receiver and a transmitter in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0035] In the prior art, in order to clarify the relationship between the socket and the circuit breaker inside the house, generally two or more people cooperate to complete the detection, and the circuit breaker needs to be opened and closed continuously, so as to judge whether the circuit breaker is connected to the socket one by one. In this way, the operator needs to operate each circuit breaker to open and close, so as to try to judge the connection relationship between the circuit breaker and the socket. This operation is very cumbersome and inefficient, and the accurate connection relationship between the two cannot be quickly judged. In addition, there are generally multiple rooms in the house. If you want to know the relationship between the circuit breakers corresponding to each room, you need to repeat the above detection process, which is extremely inefficient and not conducive to rapid detection. However, the present application cooperates with a receiver S1 and multiple transmitters S2 to form a line-finding detection system, and a transmitter S2 is placed in each room or each AC branch, and cooperates with the receiver S1. The receiver S1 starts a transmitter S2 through the LoRa wireless communication connection, thereby realizing the connection mode judgment between the circuit breaker and the socket in turn.

[0036] In layman's terms, the receiver S1 is equipped with a first radio frequency wireless communication module, and the transmitter S2 is equipped with a second radio frequency wireless communication module. The user selects the ID number of the transmitter S2 to be detected on the receiver S1, and the receiver S1 will send a wireless control instruction through the first radio frequency wireless communication module. When the transmitter S2 corresponding to the ID number receives the wireless control instruction, the trigger module is activated to generate a line search signal. Different transmitters S2 have different ID numbers to achieve a quick connection response.

[0037] Furthermore, the ID number setting of the transmitter S2 involves the digital communication protocol of multi-point communication. It is common to distinguish different devices by address code or device ID. The general format is: prefix 1 + prefix 2 + device ID + command ID + information length + information content.

[0038] The header indicates the beginning of a data frame. The data receiver uses the header to locate a frame of data for subsequent data analysis and processing. In the above example, the header is composed of two bytes, header 1 and header 2 (0x01FC).

[0039] Device ID: Indicates who is the receiver of this frame of data. Each device involved in the communication is assigned a unique device ID. When the receiver receives a data frame, it will compare the device ID in the data frame with its own device ID. Only when the two match will the data frame be received and processed, otherwise it will be discarded.

[0040] Command ID: Indicates the function of this frame of data. The receiver will parse the following valid information according to the format of different command IDs.

[0041] Information length: indicates the length of valid information in this frame of data. The receiver will receive complete valid information according to the information length.

[0042] Information content: the specific content of the valid information in this frame of data.

[0043] In the embodiment of the present application, VT1 is a positive and negative pulse signal, VT2 is a negative triangular pulse signal, VT3 is a negative triangular pulse amplified signal, and VT4 is a sawtooth wave signal.

[0044] like Figures 1 to 6 As shown, an embodiment of the first aspect of the present application provides a house AC power socket line search detection system, including a receiver S1 and a plurality of transmitters S2, the receiver S1 and each transmitter S2 are connected via wireless communication for controlling the working state of the transmitter S2 via the receiver S1;

[0045] The transmitter S2 includes a trigger module for connecting to an AC power source and generating a line-finding signal;

[0046] Receiver S1, including a line-finding signal sensing module, a shaping and amplifying module, a secondary shaping module and a data sampling and processing module connected in sequence;

[0047] Among them, after the line-finding signal is captured by the line-finding signal sensing module, it is processed by the shaping amplifier module and the secondary shaping module to generate a sawtooth wave signal VT4, which is input into the data sampling processing module, and the average voltage value Va of the sawtooth wave signal VT4 is calculated; when the receiver S1 does not capture the line-finding signal, the average voltage value of the sawtooth wave signal VT4 is the reference voltage value, that is, Va = 2.5V; when the receiver S1 is close to the circuit breaker superimposed with the line-finding signal, a deviation voltage value is generated, and the deviation voltage value is the difference between the reference voltage value and the average voltage value of the sawtooth wave signal VT4, that is, △V = 2.5-Va; when the deviation voltage value is greater than the alarm threshold value △Vth, the receiver S1 alarms to prompt that the circuit breaker currently approaching is the target circuit breaker. That is to say, as long as △V>△Vth, the alarm is triggered.

[0048] Specifically, the data sampling and processing module is ADC.

[0049] When calculating the deviation voltage value, the maximum deviation voltage value △Vmax is continuously updated and saved, and 95% of the maximum deviation voltage value △Vmax is set as the alarm threshold value △Vth.

[0050] When in use, the transmitter S2 is inserted into the socket to be detected, the trigger module inside the transmitter S2 is started, and a line-finding signal is generated. The user holds the receiver S1 and approaches the circuit breakers one by one. When the receiver S1 approaches or is close to the circuit breaker that is connected to the transmitter S2, an audible and visual alarm is triggered, which prompts to find the circuit breaker directly connected to the socket to be detected. The present application can detect the connection relationship between the socket and the circuit breaker without turning off the power, and does not affect the electrical equipment connected to the socket. In addition, only one person is required to complete the entire detection process, which is convenient and simple to operate and saves labor costs.

[0051] like Figures 1 to 6 As shown, the trigger module includes a trigger circuit;

[0052] The first input terminal of the trigger circuit is connected to the live wire terminal of the AC power supply, and the second output terminal of the trigger circuit is connected to the neutral wire terminal of the AC power supply.

[0053] Specifically, when the transmitter S2 is connected to the socket, the transmitter S2 is connected to the AC branch, thereby triggering the module to turn on and generating a line-finding signal. The line-finding signal is superimposed on the AC branch of the socket, so that all sockets belonging to the current AC branch and the connected circuit breakers will appear on the line-finding signal. In this way, no additional interference signals will be generated to other AC branches, thereby ensuring the accuracy of the signal captured by the receiver S1.

[0054] like Figures 1 to 6 As shown, the trigger circuit includes a two-phase trigger diode D1, a diode D2, a resistor R100 and a capacitor C100. One end of the two-phase trigger diode D1 is connected to the neutral line end of the AC power supply, the other end of the two-phase trigger diode D1 is connected to one end of the capacitor C100, the anode of the diode D2 is connected to the live line end of the AC power supply, the cathode of the diode D2 is connected to the other end of the capacitor C100, and the resistor R100 is connected in parallel to both ends of the capacitor C100.

[0055] Specifically, resistor R100 is a load resistor, and capacitor C100 is a load capacitor. When the voltage across the two-phase trigger diode D1 exceeds its breakdown voltage threshold, it is turned on, and capacitor C100 will be charged at this moment. The moment C100 is charged is equivalent to a short circuit. At the same time, due to the existence of the power supply loop resistance, the power supply of the current AC branch will be instantly pulled down, thereby causing a momentary pull-down pulse on the originally smooth AC sine wave. This is the line-seeking signal used as an identifier. In this way, the trigger circuit has a simple structure and low production cost, which is conducive to mass production.

[0056] The resistance value of the resistor R100 is 10kΩ, and the resistance value of the capacitor C100 is 0.33uF.

[0057] like Figures 1 to 6 As shown, the line-finding signal sensing module includes a signal capture circuit and a first co-directional pulse amplifying circuit;

[0058] A signal capture circuit, used for receiving a line-finding signal;

[0059] The first in-phase pulse amplifier circuit has an input end connected to the signal capture circuit, and an output end connected to the shaping amplifier module. The first in-phase pulse amplifier circuit is used to output positive and negative pulse signals VT1.

[0060] When in use, after the signal capture circuit captures the line-finding signal, the first co-directional pulse amplification circuit receives the line-finding signal, amplifies the line-finding signal, obtains positive and negative pulse signals VT1, and outputs the positive and negative pulse signals VT1 to the shaping and amplification module.

[0061] like Figures 1 to 6 As shown, the signal capture circuit includes an inductor L1, a resistor R9, a resistor R8, a capacitor C4, a capacitor C5 and a reference power supply V8. The first end of the resistor R8 is connected to the positive electrode of the reference power supply V8, the second end of the resistor R8 is connected to the first end of the resistor R9, the second end of the resistor R9 is connected to the first end of the inductor L1 through the capacitor C4, the second end of the inductor L1 is connected to the positive electrode of the reference power supply V8, the two ends of the capacitor C5 are respectively connected to the first end and the second end of the resistor R8, the second end of the resistor R8 and the common end of the capacitor C5 are the output end of the signal capture circuit for connecting to the first co-directional pulse amplification circuit.

[0062] Specifically, the voltage of the reference power supply V8 is 2.5 V. When the inductive probe of the receiver S1 is close to the circuit breaker superimposed with the line-finding signal, the voltage pulse in the line-finding signal is captured by the inductive probe, and the line-finding signal is superimposed on the reference voltage V8.

[0063] The inductive probe of the receiver S1 uses the LC series resonance principle to capture the line-finding signal. Among them, the inductance value of the inductor L1 and the capacitance of the capacitor C4 are matched according to the frequency of the line-finding signal. When the signal capture circuit captures the line-finding signal, the induced current flowing through the resistor R8 and the resistor R9 can reach the maximum, and the corresponding induced voltage is also larger.

[0064] The resistors R8, R9 and C5 together serve as the load of the induced current, and can convert the induced current into an induced voltage. Meanwhile, the resistors R8 and R9 form a voltage divider circuit to perform voltage division processing on the line-finding signal.

[0065] Capacitor C8 is connected to both ends of the reference voltage V8 and serves as a filter capacitor of the reference voltage V8, thereby stabilizing the reference voltage V8.

[0066] The inductance of the inductor L1 is 4.7 mH, the resistance of the resistor R9 is 470 Ω, the resistance of the resistor R8 is 330 Ω, the capacitance of the capacitor C4 is 4.7 nF, and the capacitance of the capacitor C5 is 2.2 nF.

[0067] like Figures 1 to 6 As shown, the first co-directional pulse amplification circuit includes an operational amplifier U3A, a capacitor C6, a resistor R10, a resistor R11 and a capacitor C7. The non-inverting input terminal of the operational amplifier U3A is connected to the signal capture circuit, the inverting input terminal of the operational amplifier U3A is connected to the resistor R10 through the capacitor C6, and the resistor R10 is grounded, the output terminal of the operational amplifier U3A is connected to the shaping amplification module, the two ends of the resistor R11 are respectively connected between the inverting input terminal of the operational amplifier U3A and the output terminal of the operational amplifier U3A, and the capacitor C7 is connected in parallel with the resistor R11.

[0068] Exemplarily, the first in-phase pulse amplifying circuit receives the line-seeking signal superimposed with a 2.5V DC voltage reference, amplifies it, and finally outputs a positive and negative pulse signal VT1 superimposed with a 2.5V DC bias.

[0069] The resistor R11 and the capacitor C7 form a feedback loop of the first co-directional pulse amplifying circuit.

[0070] Capacitor C6 is a DC blocking capacitor, which enables the first co-directional pulse amplifier circuit to amplify only the AC part of the line-finding signal superimposed with a 2.5V DC voltage reference.

[0071] The resistor R10 forms a reference loop of the first co-directional pulse amplifying circuit, and provides a reference potential of the first co-directional pulse amplifying circuit to the ground line.

[0072] The capacitance of the capacitor C6 is 330 nF, the resistance of the resistor R10 is 15 kΩ, the resistance of the resistor R11 is 150 kΩ, and the capacitance of the capacitor C7 is 47 pF.

[0073] like Figures 1 to 6 As shown, the shaping and amplifying module includes a shaping circuit and a second co-directional pulse amplifying circuit; the input end of the shaping circuit is connected to the line-finding signal sensing module, and the output end of the shaping circuit is connected to the second co-directional pulse amplifying circuit, and the shaping circuit is used to output the negative triangular pulse signal VT2 to the second co-directional pulse amplifying circuit, and the output end of the second co-directional pulse amplifying circuit is connected to the secondary shaping module, and the second co-directional pulse amplifying circuit is used to output the negative triangular pulse amplified signal VT3 to the secondary shaping module.

[0074] like Figures 1 to 6As shown, the shaping circuit includes a comparator U2A, a comparator U2B, a resistor R1, a resistor R2, a resistor R3 and a capacitor C1. The in-phase input terminal of the comparator U2A is connected to the line-finding signal sensing module, the inverting input terminal of the comparator U2A is connected to the output terminal of the comparator U2A, the first voltage terminal of the comparator U2A is connected to the output terminal of the comparator U2A through the resistor R1, the second voltage terminal of the comparator U2A is connected to the output terminal of the comparator U2A through the capacitor C1, the in-phase input terminal of the comparator U2B is connected to a DC bias power supply, the inverting input terminal of the comparator U2B is connected to the line-finding signal sensing module through the resistor R3, the output terminal of the comparator U2B is connected to the inverting input terminal of the comparator U2B through the resistor R2, and the output terminal of the comparator U2B is connected to the output terminal of the comparator U2A to output a negative triangular pulse signal.

[0075] Exemplarily, the positive and negative pulse signals VT1 are flipped by the comparators U2A and U2B in the shaping circuit to become a single negative pulse signal, and then filtered by the capacitor C1 to finally become the negative triangular pulse signal VT2.

[0076] Comparator U2A and comparator U2B in the shaping circuit process the positive pulse and negative pulse in the positive and negative pulse signal VT1 respectively. Comparator U2A and comparator U2B are both integrated comparators, model LM393, and their output ports are characterized by open-drain output, which means that the output ports of comparator U2A and comparator U2B must rely on resistor R1 as a pull-up resistor to output a high level, and can directly output a low level under normal circumstances. Therefore, capacitor C1 can be instantly pulled down and discharged by the output ports of comparator U2A and comparator U2B, but can only rely on resistor R1 for charging.

[0077] Comparator U2A forms a same-direction follower in the shaping circuit. When the positive pulse in the positive and negative pulse signal VT1 passes, the output of comparator U2A is cut off; when the negative pulse in the positive and negative pulse signal VT1 passes, comparator U2A outputs a low level.

[0078] Comparator U2B forms a reverse follower in the shaping circuit. When the positive pulse in the positive and negative pulse signal VT1 passes, the output of comparator U2B is cut off. When the negative pulse in the positive and negative pulse signal VT1 passes, the output of comparator U2B is cut off.

[0079] Since the output terminals of comparator U2A and comparator U2B are directly connected, coupled with the charging and discharging effects of capacitor C1 and resistor R1, a negative triangular pulse signal VT2 can be obtained.

[0080] The resistance value of resistor R1 is 100 kΩ. The resistance value of resistor R2 is 12 kΩ. The resistance value of resistor R3 is 12 kΩ. The capacitance of capacitor C1 is 330 nF.

[0081] like Figures 1 to 6 As shown, the second common-direction pulse amplifying circuit includes an operational amplifier U3B, a resistor R4, a resistor R5 and a capacitor C2. The common-phase input terminal of the operational amplifier U3B is connected to the output terminal of the shaping circuit, the inverting input terminal of the operational amplifier U3B is connected to the output terminal of the operational amplifier U3B through the resistor R5, the inverting input terminal of the operational amplifier U3B is grounded through the resistor R4, the output terminal of the operational amplifier U3B is connected to the secondary shaping module, and the capacitor C2 is connected in parallel to both ends of the resistor R5.

[0082] Exemplarily, the second common-direction pulse amplifier circuit receives and amplifies the negative triangular pulse signal VT2, and finally outputs a negative triangular pulse amplified signal VT3.

[0083] The resistor R5 and the capacitor C2 form a feedback loop of the second co-directional pulse amplifying circuit.

[0084] The resistor R4 is connected to the reference power source V4. The resistor R4 and the reference power source V4 form a reference loop of the second co-directional pulse amplifying circuit, providing the second co-directional pulse amplifying circuit with a reference potential of 2.5V.

[0085] The voltage of the reference power source V4 is 2.5V. The resistance value of the resistor R4 is 12kΩ. The resistance value of the resistor R5 is 12kΩ. And the capacitance of the capacitor C2 is 36pF. The signal of the operational amplifier U3B is LM358AD.

[0086] like Figures 1 to 6 As shown, the secondary shaping module includes a comparator U1B, a resistor R6, a resistor R7 and a capacitor C3. The non-inverting input terminal of the comparator U1B is connected to the shaping amplifier module through the resistor R7, the inverting input terminal of the comparator U1B is connected to the output terminal of the comparator U1B, the output terminal of the comparator U1B is connected to the first power supply V7 through the resistor R6, the first voltage terminal of the comparator U1B is connected to the second power supply V6, the second voltage terminal of the comparator U1B is connected to the output terminal of the comparator U1B through the capacitor C3, and the output terminal of the comparator U1B is used to output the sawtooth wave signal VT4 to the data sampling and processing module.

[0087] Specifically, the resistance value of resistor R6 is 1MΩ. Since the resistance value of resistor R6 is very large, the current of positive charging of capacitor C3 will be very small. After the negative triangular pulse amplified signal VT3 is filtered by capacitor C3, the rising edge of its pulse becomes flatter. When the falling edge of the next pulse comes, the forward voltage of capacitor C3 starts to discharge before it rises to 2.5V, so that the negative triangular pulse amplified signal VT3 is shaped into a sawtooth wave signal VT4, and the voltage average value of the sawtooth wave signal VT4 is significantly lower than the 2.5V reference.

[0088] When the induction probe of the receiver S1 is closer to or closer to the target circuit breaker, the induced voltage is stronger and the average voltage of the sawtooth wave signal VT4 is smaller.

[0089] More specifically, the comparator U1B is an integrated comparator, model LM393. The resistance of the resistor R7 is 1 kΩ. The capacitance of the capacitor C3 is 100 nF. The voltage of the first power supply V7 is 2.5 V. The voltage of the second power supply V6 is 5 V.

[0090] The above are only preferred embodiments of the present application, and do not constitute any formal limitation on the present application. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment of equivalent changes. Therefore, all equivalent changes made according to the shape, structure and principle of the present application without departing from the content of the technical solution of the present application should be included in the protection scope of the present application.

Claims

1. A house AC power socket line detection system, characterized in that: It includes a receiver and a plurality of transmitters, wherein the receiver is connected to each of the transmitters via wireless communication for controlling the working state of the transmitters via the receiver; The transmitter includes a trigger module for connecting to an AC power supply and generating a line-finding signal; the trigger module includes a trigger circuit; a first input end of the trigger circuit is connected to the live wire end of the AC power supply, and a second output end of the trigger circuit is connected to the neutral wire end of the AC power supply; the trigger circuit includes a dual-phase trigger diode D1, a diode D2, a resistor R100 and a capacitor C100, one end of the dual-phase trigger diode D1 is connected to the neutral wire end of the AC power supply, the other end of the dual-phase trigger diode D1 is connected to one end of the capacitor C100, the anode of the diode D2 is connected to the live wire end of the AC power supply, the cathode of the diode D2 is connected to the other end of the capacitor C100, and the resistor R100 is connected in parallel to both ends of the capacitor C100; A receiver, comprising a line-finding signal sensing module, a shaping and amplifying module, a secondary shaping module and a data sampling and processing module connected in sequence; the line-finding signal sensing module comprises a signal capture circuit and a first unidirectional pulse amplifying circuit; the signal capture circuit is used to receive a line-finding signal; a first unidirectional pulse amplifying circuit, the input end of the first unidirectional pulse amplifying circuit is connected to the signal capture circuit, and the output end of the first unidirectional pulse amplifying circuit is connected to the shaping and amplifying module; the signal capture circuit comprises an inductor L1, a resistor R9, a resistor R8, a capacitor C4, a capacitor C5 and a reference power supply, the first end of the resistor R8 is connected to the positive electrode of the reference power supply, the second end of the resistor R8 is connected to the first end of the resistor R9, the second end of the resistor R9 is connected to the first end of the inductor L1 through the capacitor C4, the second end of the inductor L1 is connected to the positive electrode of the reference power supply, the two ends of the capacitor C5 are respectively connected to the first end and the second end of the resistor R8, the second end of the resistor R8 and the common end of the capacitor C5 are the output end of the signal capture circuit for connecting to the first unidirectional pulse amplifying circuit; The line-finding signal is captured by the line-finding signal sensing module, and is processed by the shaping and amplification module and the secondary shaping module to generate a sawtooth wave signal. The sawtooth wave signal is input into the data sampling and processing module, and the average voltage value of the sawtooth wave signal is calculated. When the receiver fails to capture the line-finding signal, the average voltage value of the sawtooth wave signal is a reference voltage value; When the receiver is close to the circuit breaker on which the line search signal is superimposed, a deviation voltage value is generated, wherein the deviation voltage value is the difference between the reference voltage value and the average voltage value of the sawtooth wave signal; When the deviation voltage value is greater than the alarm threshold value, the receiver alarms to indicate that the currently approaching circuit breaker is the target circuit breaker.

2. The house AC power socket line finding detection system according to claim 1, characterized in that: The first co-directional pulse amplifying circuit includes an operational amplifier U3A, a capacitor C6, a resistor R10, a resistor R11 and a capacitor C7. The non-inverting input terminal of the operational amplifier U3A is connected to the signal capture circuit, the inverting input terminal of the operational amplifier U3A is connected to the resistor R10 through the capacitor C6, and the resistor R10 is grounded, the output terminal of the operational amplifier U3A is connected to the shaping amplification module, the two ends of the resistor R11 are respectively connected between the inverting input terminal of the operational amplifier U3A and the output terminal of the operational amplifier U3A, and the capacitor C7 is connected in parallel with the resistor R11.

3. The house AC power socket line finding detection system according to claim 1, characterized in that: The shaping and amplifying module includes a shaping circuit and a second unidirectional pulse amplifying circuit; the input end of the shaping circuit is connected to the line-finding signal sensing module, and the output end of the shaping circuit is connected to the second unidirectional pulse amplifying circuit, and the shaping circuit is used to output a negative triangular pulse signal to the second unidirectional pulse amplifying circuit, and the output end of the second unidirectional pulse amplifying circuit is connected to the secondary shaping module, and the second unidirectional pulse amplifying circuit is used to output a negative triangular pulse amplified signal to the secondary shaping module.

4. The house AC power socket line finding detection system according to claim 3, characterized in that: The shaping circuit includes a comparator U2A, a comparator U2B, a resistor R1, a resistor R2, a resistor R3 and a capacitor C1. The non-phase input terminal of the comparator U2A is connected to the line-finding signal sensing module, the inverting input terminal of the comparator U2A is connected to the output terminal of the comparator U2A, the first voltage terminal of the comparator U2A is connected to the output terminal of the comparator U2A through the resistor R1, the second voltage terminal of the comparator U2A is connected to the output terminal of the comparator U2A through the capacitor C1, the inverting input terminal of the comparator U2B is connected to a DC bias power supply, the non-phase input terminal of the comparator U2B is connected to the line-finding signal sensing module through the resistor R3, the output terminal of the comparator U2B is connected to the non-phase input terminal of the comparator U2B through the resistor R2, and the output terminal of the comparator U2B is connected to the output terminal of the comparator U2A to output the negative triangular pulse signal.

5. The house AC power socket line finding detection system according to claim 3, characterized in that: The second co-directional pulse amplifying circuit includes an operational amplifier U3B, a resistor R4, a resistor R5 and a capacitor C2. The non-inverting input terminal of the operational amplifier U3B is connected to the output terminal of the shaping circuit, the inverting input terminal of the operational amplifier U3B is connected to the output terminal of the operational amplifier U3B through the resistor R5, the inverting input terminal of the operational amplifier U3B is grounded through the resistor R4, the output terminal of the operational amplifier U3B is connected to the secondary shaping module, and the capacitor C2 is connected in parallel to both ends of the resistor R5.

6. The house AC power socket line finding detection system according to claim 1, characterized in that: The secondary shaping module includes a comparator U1B, a resistor R6, a resistor R7 and a capacitor C3. The non-inverting input terminal of the comparator U1B is connected to the shaping amplification module through the resistor R7, the inverting input terminal of the comparator U1B is connected to the output terminal of the comparator U1B, the output terminal of the comparator U1B is connected to the first power supply V7 through the resistor R6, the first voltage terminal of the comparator U1B is connected to the second power supply V6, the second voltage terminal of the comparator U1B is connected to the output terminal of the comparator U1B through the capacitor C3, and the output terminal of the comparator U1B is used to output a sawtooth wave signal to the data sampling and processing module.

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