Open circuit finder

Abstract

The open circuit finder comprises a transmitter and a receiver, the transmitter comprises a transmitting circuit, and the transmitting circuit can transmit two groups of pulse signals; when the transmitter carries out open-circuit searching, the transmitting circuit is connected with the live wire and the null line, one group of pulse signals flow from the live wire to the null line, and the other group of pulse signals flow from the null line to the live wire; and the receiver is used for detecting the pulse signal transmitted by the transmitting circuit and outputting a position indication. Two groups of pulse signals are transmitted through the transmitting circuit, the flow directions of the two groups of pulse signals are opposite and are respectively from a live wire to a zero wire and from the zero wire to the live wire, and reverse waveforms are supplemented, so that when a receiver searches a line, the direction is not limited, signal query is more stable and reliable, and the receiver can stably receive the signals no matter which direction the receiver approaches the line. Therefore, non-direction limitation detection is realized, the detection precision and efficiency are improved, the dependence on user specialty is reduced, and the method adapts to a complex electromagnetic environment.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit break finders, and in particular to a circuit break finder. Background Art

[0002] A fault finder consists of a transmitter and a receiver. Connecting the transmitter to a circuit injects a unique high-frequency signal into the target circuit, and the receiver detects the electromagnetic field generated by the signal. By analyzing the pattern of changes in signal strength detected by the receiver, the fault point can be located or the line path can be traced. It is an efficient and relatively safe fault location tool based on electromagnetic induction.

[0003] like Figure 1 The figure shown is a standard U.S. circuit breaker. Because the circuit breaker's transmitter only transmits one signal, which flows from the hot wire to the neutral wire, its waveform is only forward, with no reverse waveform. This results in the receiver only being able to detect the circuit breaker from top to bottom vertically when testing for continuity. This ensures a more stable signal and allows for accurate on / off determination. Each operation requires testing from top to bottom. If the receiver is moved from bottom to top, or in other directions, the reverse signal is weak, or even completely lost, making circuit breaker detection impossible.

[0004] As we all know, due to the living habits of American residents, most people tend to do simple installation and maintenance of some house circuits by themselves. This group of people often lack professional knowledge in using tools. If they do not know that the receiver can only be moved in a single direction for detection, they cannot use the detection tools correctly. Summary of the Invention

[0005] Based on the above, the purpose of the present invention is to provide a circuit breaker finder to supplement the transmitted signal. No matter from which direction the receiver approaches the line, it can stably receive the signal, thereby improving the efficiency and accuracy of circuit maintenance.

[0006] To achieve the above object, the present invention adopts the following technical solutions: The present invention provides a circuit breaker finder, comprising a transmitter and a receiver, wherein the transmitter comprises a transmitting circuit capable of sending two sets of pulse signals; When the transmitter performs a circuit break search, the transmitting circuit connects the live wire and the neutral wire, wherein one group of pulse signals flows from the live wire to the neutral wire, and another group of pulse signals flows from the neutral wire to the live wire; The receiver is used to detect the pulse signal sent by the transmitting circuit and output a position indication.

[0007] Furthermore, the transmitting circuit includes two groups of first transmitting circuits, each group of the first transmitting circuits transmits a group of pulse signals, and the directions of the two pulse signals are opposite; Alternatively, the transmitting circuit includes two groups of second transmitting circuits, each group of the second transmitting circuits transmits a group of pulse signals, and the directions of the two pulse signals are opposite; Alternatively, the transmitting circuit includes a first transmitting circuit and a second transmitting circuit, the first transmitting circuit transmits a group of pulse signals, and the second transmitting circuit transmits another group of pulse signals, and the two pulse signals have opposite directions.

[0008] Further, the transmitting circuit includes a first transmitting circuit; The first transmitting circuit includes a bilateral voltage-triggered switch Q1, a capacitor C2, a diode D5, and a resistor R5, wherein L is connected to one end of Q1, the other end of Q1 is connected to one end of C2 and R5 in parallel, and the other ends of C2 and R5 are connected together to the cathode of D5; the anode of D6 is connected to N; And / or, the first transmitting circuit includes a bilateral voltage-triggered switch Q2, a capacitor C7, a diode D11, and a resistor R14, N is connected to one end of Q2, the other end of Q2 is simultaneously connected to one end of C7 and R14 in parallel, the other ends of C7 and R14 are connected together to the cathode of D11, and the anode of D11 is connected to L.

[0009] Further, the transmitting circuit includes a second transmitting circuit; The second transmitting circuit includes a bilateral voltage-triggered switch Q3, capacitors C10 and C11, diodes D17 and D18, resistors R24 and R25, N is connected to the anode of D17 and one end of Q3 at the same time, the cathode of D17 is connected to one end of C10 and R24 in parallel, the other end of Q3 is connected to one end of C11 and R25 in parallel, the other ends of C10 and C11 and the other ends of R24 and R25 are commonly connected to the cathode of D18, and the anode of D18 is connected to L; And / or, the second transmitting circuit includes a bilateral voltage-triggered switch Q4, capacitors C12 and C13, diodes D19 and D20, resistors R26 and R27, L is connected to the anode of D19 and one end of Q4 at the same time, the cathode of D19 is connected to one end of C12 and R26 in parallel, the other end of Q4 is connected to one end of C13 and R27 in parallel, the other ends of C12 and C13 and the other ends of R25 and R26 are commonly connected to the cathode of D20, and the anode of D20 is connected to N.

[0010] Furthermore, the capacitors C2 and C7 in the first transmitting circuit are both safety X2 type AC capacitors; And / or, the diodes D5 and D11 are 1N4007 rectifier diodes; And / or, the bilateral voltage-triggered switches Q1 and Q2 are K1050E silicon bilateral voltage-triggered switches, and the driving signals are provided by the MCU after being isolated by an optical coupler.

[0011] Furthermore, the capacitors C10, C11, C12, and C13 in the second transmitting circuit are all safety X2 type AC capacitors. And / or, the diodes D17, D18, D19, and D20 are all 1N4007 rectifier diodes; And / or, the bilateral voltage-triggered switches Q3 and Q4 are K1050E silicon bilateral voltage-triggered switches, and the driving signals are provided by the MCU after being isolated by an optical coupler.

[0012] Furthermore, the pulse signal is a low-frequency pulse train.

[0013] Another aspect provides a disconnect finder transmitter, comprising a transmitting circuit capable of emitting two sets of pulse signals; When the transmitter performs circuit breakage detection, the transmitting circuit connects the live wire and the neutral wire, wherein one group of pulse signals flows from the live wire to the neutral wire, and another group of pulse signals flows from the neutral wire to the live wire.

[0014] Furthermore, the transmitting circuit includes two groups of first transmitting circuits, each group of the first transmitting circuits transmits a group of pulse signals, and the directions of the two pulse signals are opposite; Alternatively, the transmitting circuit includes two groups of second transmitting circuits, each group of the second transmitting circuits transmits a group of pulse signals, and the directions of the two pulse signals are opposite; Alternatively, the transmitting circuit includes a first transmitting circuit and a second transmitting circuit, the first transmitting circuit transmits a group of pulse signals, and the second transmitting circuit transmits another group of pulse signals, and the two pulse signals have opposite directions.

[0015] Furthermore, the circuit break finder transmitter includes a shell, a triangular plug is provided on the shell, and the transmitting circuit is electrically connected to the live wire plug and the neutral wire plug of the triangular plug.

[0016] The beneficial effects of the present invention are: The present invention provides a circuit break finder, which transmits two groups of pulse signals through a transmitting circuit. The two groups of pulse signals flow in opposite directions, namely from the live wire to the neutral wire and from the neutral wire to the live wire. Reverse waveforms are added, so that when the receiver searches for the line, the direction is not restricted, and the signal query is more stable and reliable. No matter from which direction the receiver approaches the line, it can stably receive the signal, thereby realizing detection without direction restriction, improving detection accuracy and efficiency, reducing dependence on user expertise, and adapting to complex electromagnetic environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. 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 the contents of the embodiments of the present invention and these drawings without any creative work.

[0018] Figure 1 A diagram of a prior art break finder receiver during testing; Figure 2 A circuit diagram of a first transmitting circuit of a break finder transmitter provided in an embodiment of the present invention; Figure 3 A circuit diagram of a second transmitting circuit of a break finder transmitter provided in an embodiment of the present invention; Figure 4 A schematic structural diagram of a circuit break finder transmitter provided in an embodiment of the present invention; Figure 5 A schematic structural diagram of a receiver of a circuit break finder provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0020] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0021] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0023] The present invention breaks through the problem that traditional transmitter signals can only be transmitted in one direction, with only one set of forward waveforms and the reverse waveform signal missing, and the receiver can only receive the forward waveform during verification, which is normal for professional power grid maintenance personnel. However, when facing ordinary amateur power grid maintenance personnel, especially in the European and American market environment, users themselves inspect and maintain the home power grid. Due to the lack of professional inspection and maintenance knowledge, in normal use scenarios, users may not necessarily perform inspections in exactly the same way as the product itself is set. Once the user does not follow the standard forward inspection, if reverse inspection occurs, the instrument will have poor results or malfunction. The bidirectional signal waveform of the present application perfectly solves the defects in signal transmission, and its detection effect can be accurately and effectively exerted regardless of the user or the complex environment.

[0024] The embodiment of the present invention provides a circuit breaker finder, including a transmitter and a receiver, such as Figure 4 The figure shows a schematic diagram of the structure of the transmitter, which includes a housing, a triangular plug is provided on the housing, and the transmitting circuit is electrically connected to the live wire plug and the neutral wire plug of the triangular plug; Figure 5 The receiver is equipped with an electromagnetic induction module. After receiving the signal (i.e. sensing the change in the magnetic field), the receiver can indicate the detection result through the MCU output of buzzer alarm, analog bar indicator signal strength display, single signal indicator, LCD screen analog bar signal indication, LCD screen analog bar percentage signal display, and other sound and light interaction information. The receiver is no different from the existing technology and will not be repeated here.

[0025] The transmitter includes a transmitting circuit, which can emit two sets of pulse signals; when the transmitter performs a circuit break search, the transmitting circuit connects the live wire and the neutral wire, where one set of pulse signals flows from the live wire to the neutral wire, and the other set of pulse signals flows from the neutral wire to the live wire; the receiver is used to detect the pulse signals emitted by the transmitting circuit and output a position indication.

[0026] The present invention provides a circuit break finder, which transmits two groups of pulse signals through a transmitting circuit. The two groups of pulse signals flow in opposite directions, namely from the live wire to the neutral wire and from the neutral wire to the live wire. The reverse waveform is supplemented, so that when the receiver searches for the line, the direction is not restricted, and the signal query is more stable and reliable. No matter from which direction the receiver approaches the line, it can stably receive the signal, thereby realizing detection without direction restriction, improving detection accuracy and efficiency, reducing dependence on user expertise, and adapting to complex electromagnetic environments.

[0027] In some embodiments, the transmitting circuit includes two groups of first transmitting circuits, each group of the first transmitting circuits transmits a group of pulse signals, and the two pulse signals flow in opposite directions; or, the transmitting circuit includes two groups of second transmitting circuits, each group of the second transmitting circuits transmits a group of pulse signals, and the two pulse signals flow in opposite directions; or, the transmitting circuit includes a first transmitting circuit and a second transmitting circuit, the first transmitting circuit transmits a group of pulse signals, and the second transmitting circuit transmits another group of pulse signals, and the two pulse signals flow in opposite directions.

[0028] In some embodiments, as Figure 2 As shown, Figure 2 Shown is a circuit diagram of two groups of first transmitting circuits, wherein the transmitting circuit includes a first transmitting circuit; The first transmitting circuit includes a bilateral voltage-triggered switch Q1, a capacitor C2, a diode D5, and a resistor R5, with L connected to one end of Q1, the other end of Q1 connected to both ends of C2 and R5 in parallel, the other ends of C2 and R5 connected together to the cathode of D5; the anode of D6 connected to N; and / or the first transmitting circuit includes a bilateral voltage-triggered switch Q2, a capacitor C7, a diode D11, and a resistor R14, with N connected to one end of Q2, the other end of Q2 connected to both ends of C7 and R14 in parallel, the other ends of C7 and R14 connected together to the cathode of D11, and the anode of D11 connected to L. Specifically, in this embodiment of the present invention, the MCU drives Q1 and Q2 via an optocoupler. When Q1 is turned on, a positive pulse is generated from the hot line to the neutral line, instantaneously charging the capacitor. After Q1 is turned off, the charge on C2 is rapidly discharged through R5 and D5, preparing for the next pulse. When Q2 is turned on, a reverse pulse is generated from the neutral line to the hot line, and similarly, the charge on C7 is rapidly discharged through R14 and D11. This alternating conduction forms a bidirectional, low-energy, high-frequency pulse current between the live wire and the neutral wire for the receiver to detect and locate.

[0029] In some embodiments, as Figure 3 As shown, Figure 3 Shown is a circuit diagram of two groups of second transmitting circuits, wherein the transmitting circuit includes a second transmitting circuit; The second transmitting circuit includes a bilateral voltage-triggered switch Q3, capacitors C10 and C11, diodes D17 and D18, resistors R24 and R25, N is simultaneously connected to the anode of D17 and one end of Q3, the cathode of D17 is connected to one end of C10 and R24 in parallel, the other end of Q3 is connected to one end of C11 and R25 in parallel, the other ends of C10 and C11 and the other ends of R24 and R25 are commonly connected to the cathode of D18, and the anode of D18 is connected to L; and / or, the second transmitting circuit includes a bilateral voltage-triggered switch Q4, capacitors C12 and C13, diodes D19 and D20, resistors R26 and R27, L is simultaneously connected to the anode of D19 and one end of Q4, the cathode of D19 is connected to one end of C12 and R26 in parallel, the other end of Q4 is connected to one end of C13 and R27 in parallel, the other ends of C12 and C13 and the other ends of R25 and R26 are commonly connected to the cathode of D20, and the anode of D20 is connected to N. Specifically, in the embodiment of the present invention, the MCU drives Q3 and Q4 to turn on alternately through the optocoupler, C10 and R24 and C14 and R25 (or C12 and R26 and C13 and R27) form an AC discharge combination, D17 and D19 provide a return path, and D18 and D20 send a forward pulse to the live wire, ultimately forming a bidirectional, low-frequency, low-energy pulse current between the live wire and the neutral wire for the receiver to detect and locate.

[0030] In the embodiment of the present invention, the two first transmitting circuits can complement each other alternately, the two second transmitting circuits can complement each other alternately, and the first transmitting circuit and the second transmitting circuit can also complement each other alternately. The two groups of transmitting circuits inject pulse currents into the live wire and the neutral wire successively, bidirectionally, and crosswise within the same cycle. By adding a group of transmitting circuits to supplement the reverse waveform, the signal blind spot is eliminated, and the receiver can perform detection in any direction of the line, achieving high-precision detection and positioning without blind spots.

[0031] In some embodiments, as Figure 2 and 3 As shown, the capacitors C2 and C7 in the first transmitting circuit and the capacitors C10, C11, C12, and C13 in the second transmitting circuit are all safety X2 type AC capacitors with a rated withstand voltage of not less than 275 V_AC and a pitch of 15 mm, and are used to achieve AC coupling and DC isolation between the live wire and the neutral wire.

[0032] In some embodiments, as Figure 2 and 3 As shown, the resistance values ​​of the resistors R5, R14, R24, R25, R26, and R27 are all 220 kΩ, and the circuit package is 1206, which is used to discharge the voltage across the corresponding capacitor to below the safety threshold after power failure.

[0033] In some embodiments, as Figure 2 and 3 As shown, the diodes D5, D11, D17, D18, D19, and D20 are all 1N4007 rectifier diodes with a reverse withstand voltage of not less than 1000 V, and are used to clamp reverse spikes and provide a return path.

[0034] In some embodiments, as Figure 2 and 3 As shown, the bilateral voltage-triggered switches Q1, Q2, Q3, and Q4 are all silicon bilateral voltage-triggered switches, and the driving signals are provided by the MCU after being isolated by optical couplers.

[0035] In some embodiments, as Figure 2 and 3 As shown, the pulse signal is a bidirectional low-frequency pulse train with a pulse frequency range of 0.5 kHz to 2 kHz, a pulse width of 50 µs to 200 µs, and a pulse current amplitude of ≤5 mA, ensuring safety to the human body and electrical equipment.

[0036] It should be noted that the transmitter of this application not only has the function of a circuit breaker finder, but also has many functions such as a socket tester, a leakage protector trip tester, voltage detection, leakage current detection, etc. The above functions all belong to the prior art and have been disclosed in patents such as CN109100607A, so they will not be repeated here.

[0037] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A circuit breaker finder, comprising a transmitter and a receiver, characterized in that: The transmitter includes a transmitting circuit, and the transmitting circuit is capable of sending two sets of pulse signals; When the transmitter performs circuit breakage detection, the transmitting circuit connects the live wire and the neutral wire, wherein one group of pulse signals flows from the live wire to the neutral wire, and another group of pulse signals flows from the neutral wire to the live wire; The receiver is used to detect the pulse signal sent by the transmitting circuit and output a position indication.

2. A circuit breaker finder according to claim 1, characterized in that: The transmitting circuit includes two groups of first transmitting circuits, each group of the first transmitting circuits transmits a group of pulse signals, and the directions of the two pulse signals are opposite; The transmitting circuit includes two groups of second transmitting circuits, each group of the second transmitting circuits transmits a group of pulse signals, and the directions of the two pulse signals are opposite; Alternatively, the transmitting circuit includes a first transmitting circuit and a second transmitting circuit, the first transmitting circuit transmits a group of pulse signals, and the second transmitting circuit transmits another group of pulse signals, and the two pulse signals have opposite directions.

3. A circuit breaker finder according to claim 1, characterized in that: The transmitting circuit includes a first transmitting circuit; The first transmitting circuit includes a bilateral voltage-triggered switch Q1, a capacitor C2, a diode D5, and a resistor R5, wherein L is connected to one end of Q1, the other end of Q1 is connected to one end of C2 and R5 in parallel, and the other ends of C2 and R5 are connected together to the cathode of D5; the anode of D6 is connected to N; And / or, the first transmitting circuit includes a bilateral voltage-triggered switch Q2, a capacitor C7, a diode D11, and a resistor R14, N is connected to one end of Q2, the other end of Q2 is simultaneously connected to one end of C7 and R14 in parallel, the other ends of C7 and R14 are connected together to the cathode of D11, and the anode of D11 is connected to L.

4. A circuit breaker finder according to claim 1, characterized in that: The transmitting circuit includes a second transmitting circuit; The second transmitting circuit includes a bilateral voltage-triggered switch Q3, capacitors C10 and C11, diodes D17 and D18, resistors R24 and R25, N is connected to the anode of D17 and one end of Q3 at the same time, the cathode of D17 is connected to one end of C10 and R24 in parallel, the other end of Q3 is connected to one end of C11 and R25 in parallel, the other ends of C10 and C11 and the other ends of R24 and R25 are commonly connected to the cathode of D18, and the anode of D18 is connected to L; And / or, the second transmitting circuit includes a bilateral voltage-triggered switch Q4, capacitors C12 and C13, diodes D19 and D20, resistors R26 and R27, L is connected to the anode of D19 and one end of Q4 at the same time, the cathode of D19 is connected to one end of C12 and R26 in parallel, the other end of Q4 is connected to one end of C13 and R27 in parallel, the other ends of C12 and C13 and the other ends of R25 and R26 are commonly connected to the cathode of D20, and the anode of D20 is connected to N.

5. The circuit breaker finder according to claim 3, characterized in that: The capacitors C2 and C7 in the first transmitting circuit are both safety X2 type AC capacitors; And / or, the diodes D5 and D11 are 1N4007 rectifier diodes; And / or, the bilateral voltage-triggered switches Q1 and Q2 are K1050E silicon bilateral voltage-triggered switches, and the driving signals are provided by the MCU after being isolated by an optical coupler.

6. A circuit breaker finder according to claim 4, characterized in that: The capacitors C10, C11, C12, and C13 in the second transmitting circuit are all safety X2 type AC capacitors And / or, the diodes D17, D18, D19, and D20 are all 1N4007 rectifier diodes; And / or, the bilateral voltage-triggered switches Q3 and Q4 are K1050E silicon bilateral voltage-triggered switches, and the driving signals are provided by the MCU after being isolated by an optical coupler.

7. A circuit breaker finder according to any one of claims 1 to 6, characterized in that: The pulse signal is a low-frequency pulse train.

8. A circuit break finder transmitter, characterized in that: The transmitting circuit includes a transmitting circuit capable of transmitting two sets of pulse signals; When the transmitter performs circuit breakage detection, the transmitting circuit connects the live wire and the neutral wire, wherein one group of pulse signals flows from the live wire to the neutral wire, and another group of pulse signals flows from the neutral wire to the live wire.

9. A circuit break finder transmitter according to claim 8, characterized in that: The transmitting circuit includes two groups of first transmitting circuits, each group of the first transmitting circuits transmits a group of pulse signals, and the directions of the two pulse signals are opposite; Alternatively, the transmitting circuit includes two groups of second transmitting circuits, each group of the second transmitting circuits transmits a group of pulse signals, and the directions of the two pulse signals are opposite; Alternatively, the transmitting circuit includes a first transmitting circuit and a second transmitting circuit, the first transmitting circuit transmits a group of pulse signals, and the second transmitting circuit transmits another group of pulse signals, and the two pulse signals have opposite directions.

10. A circuit break finder transmitter according to claim 8 or 9, characterized in that: The circuit break finder transmitter comprises a shell, a triangular plug is provided on the shell, and the transmitting circuit is electrically connected to a live wire plug and a neutral wire plug of the triangular plug.

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