A dark line detection circuit and a visual handheld portable line finder

Abstract

The present invention relates to a dark line detection circuit, which includes: a magnetic head coil, an induction circuit and a status display circuit; the magnetic head coil is connected to the induction circuit, and the magnetic head coil is used to sense the alternating magnetic field generated when an alternating current is passed through the dark line, and convert the alternating magnetic field into a voltage signal and output it to the induction circuit; the induction circuit is connected to the status display circuit, and the induction circuit is used to convert the voltage signal into a binary signal, and the status display circuit is used to display the binary signal. The present invention uses the principle that when the current in the energized cable is constant, the closer the magnetic head coil is to the energized wire, the stronger the induced voltage is, and sets a magnetic head coil and an induction circuit to perform dark line detection, and uses the status display circuit to perform display, thereby realizing the detection and visual display of the dark line path.

Description

Technical Field

[0001] The invention relates to the technical field of line detection, in particular to a dark line detection circuit and a visual handheld portable line finder. Background Art

[0002] Nowadays, concealed wires are often installed in household decoration, which can ensure the beauty of the interior and is easy to use. Faced with increasingly complex decoration and home requirements, a visual handheld portable wire finder can display the concealed wires in the wall in the form of images, which greatly helps electricians, construction workers, etc. to quickly determine whether the wires in the wall are disconnected and the direction of the wires. At the same time, it can also quickly determine the direction of the wires in the wall when the circuit routing cannot be correctly determined in old residential areas, greatly improving the work efficiency and convenience of decoration workers.

[0003] When decorating a house, concealed wiring is usually used to improve the aesthetics. When other electrical equipment needs to be installed in the decorated house, such as when drilling holes in the wall to install an air conditioner, blind construction may damage the original cables and even cause electric shock. Therefore, when drilling holes, it is necessary to first determine whether there are cables in the wall at the drilling location in order to achieve accurate construction. It can be seen that in production and life, most of the lines are concealed, and it is difficult to detect the cable line path, and it is impossible to accurately maintain and modify the lines. Summary of the invention

[0004] The purpose of the present invention is to provide a dark line detection circuit and a visual handheld portable line finder to achieve the detection and visual display of the dark line path.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A dark line detection circuit, the dark line detection circuit comprising: a magnetic head coil, an induction circuit and a state display circuit;

[0007] The magnetic head coil is connected to the induction circuit, and is used to sense the alternating magnetic field generated when an alternating current is passed through the dark wire, and convert the alternating magnetic field into a voltage signal and output it to the induction circuit;

[0008] The sensing circuit is connected to the state display circuit, and the sensing circuit is used to convert the voltage signal into a binary signal, wherein the binary signal indicates whether there is a dark line or no dark line under the magnetic head coil;

[0009] The state display circuit is used to display the binary signal.

[0010] Optionally, the sensing circuit includes a NE555 chip;

[0011] Pins 2 and 6 of the NE555 chip are connected to the two ends of the magnetic head coil respectively;

[0012] Pin 3 of the NE555 chip is connected to the status display circuit.

[0013] Optionally, the status display circuit includes an LED lamp and a current limiting resistor;

[0014] The LED lamp and the current limiting resistor are connected in series between pin 3 of the NE555 chip and the ground.

[0015] Optionally, the magnetic head coil is an I-shaped inductor.

[0016] A visual handheld portable line finder, the line finder comprises a shell, a lower layer sensing circuit board, a power supply circuit board, an upper layer screen-carrying circuit board, a power supply circuit and one or more dark line detection circuits are arranged in sequence from bottom to top in the shell;

[0017] One or more magnetic head coils and induction circuits in the dark line detection circuit are arranged on the lower induction circuit board;

[0018] One or more status display circuits in the dark line detection circuit are arranged on the upper sensing circuit;

[0019] The sensing circuit and the status display circuit are connected via a flat cable;

[0020] The power circuit is arranged on the power circuit board.

[0021] Optionally, a shielding ring is disposed outside each of the magnetic head coils, and the shielding ring is made of copper sheet metal.

[0022] Optionally, the power supply circuit includes a lithium-ion battery and a power module;

[0023] The power module is respectively connected to the lithium-ion battery, the charging interface, the power output interface and the induction circuit;

[0024] The power module, the charging interface and the power output interface are all arranged on the power circuit board;

[0025] The lithium-ion battery is fixedly arranged on the power circuit board.

[0026] Optionally, the housing includes an outer shell, a rear panel, a front panel and a translucent black acrylic plate;

[0027] An observation window is provided on the top surface of the housing, the translucent black acrylic plate is arranged on the observation window, and the front panel and the rear panel are arranged at the front end and the rear end of the housing respectively;

[0028] The front panel is provided with a charging interface and a power output interface hole.

[0029] Optionally, the lower sensing circuit board, the power circuit board and the upper screen-carrying circuit board are fixed by support columns.

[0030] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0031] The present invention discloses a dark line detection circuit, which includes: a magnetic head coil, an induction circuit and a status display circuit; the magnetic head coil is connected to the induction circuit, and the magnetic head coil is used to sense the alternating magnetic field generated when an alternating current is passed through the dark line, and convert the alternating magnetic field into a voltage signal and output it to the induction circuit; the induction circuit is connected to the status display circuit, and the induction circuit is used to convert the voltage signal into a binary signal, and the binary signal indicates whether there is a dark line or no dark line under the magnetic head coil; the status display circuit is used to display the binary signal. The present invention uses the principle that when the current in the energized cable is constant, the closer the magnetic head coil is to the energized wire, the stronger the induced voltage is, and sets a magnetic head coil and an induction circuit for dark line detection, and uses the status display circuit for display, thereby realizing the detection and visual display of the dark line path.

[0032] Furthermore, the visual handheld portable line finder of the present invention is miniaturized by providing a multi-layer circuit board, so as to be convenient to carry.

[0033] The visual handheld portable line finder of the present invention is provided with a plurality of dark line detection circuits to realize the detection of line turning points.

[0034] The visual handheld portable line finder of the present invention is also provided with a shielding ring to avoid mutual interference between magnetic head coils in a plurality of dark line detection circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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 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 labor.

[0036] Figure 1 A circuit schematic diagram of a dark line detection circuit provided in Embodiment 1 of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of a visual handheld portable line finder provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The purpose of the present invention is to provide a dark line detection circuit and a visual handheld portable line finder to achieve the detection and visual display of the dark line path.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] The present invention provides a dark line detection circuit, which comprises: a magnetic head coil, an induction circuit and a status display circuit; the magnetic head coil is connected to the induction circuit, and is used to sense an alternating magnetic field generated when an alternating current is passed through a dark line, and convert the alternating magnetic field into a voltage signal and output it to the induction circuit; the induction circuit is connected to the status display circuit, and is used to convert the voltage signal into a binary signal, and the binary signal indicates whether there is a dark line or no dark line below the magnetic head coil; and the status display circuit is used to display the binary signal.

[0043] like Figure 1 As shown, the induction circuit includes a NE555 chip U6; pins 2 and 6 of the NE555 chip U6 are respectively connected to the two ends of the magnetic head coil; and pin 3 of the NE555 chip U6 is connected to the status display circuit. The status display circuit includes an LED lamp LED6 and a current limiting resistor R6; the LED lamp LED6 and the current limiting resistor R6 are connected in series between pin 3 of the NE555 chip U6 and the ground GND. Pins 4, 7 and 8 of the NE555 chip U6 are connected to the power supply VCC, and pin 5 of the NE555 chip U6 is connected to GND through a capacitor C6. The magnetic head coil is an I-shaped inductor.

[0044] The induction circuit of the present invention adopts the bistable multi-oscillation circuit of NE555 (time base circuit). The bistable circuit uses an external AC signal to change the state of pin 6 and pin 2, so as to make the 555 chip oscillate internally and control the output. This external signal is obtained from the sensor (magnetic head coil) under the device, which senses the alternating electric field generated by the AC in the wire and transmits it to NE555 for calculation, thereby changing the output state of pin 3.

[0045] Example 2

[0046] Combined with the dark line detection circuit in Example 1, this embodiment provides a visual handheld portable line finder.

[0047] (1) Power supply system

[0048] Powered by a 5V lithium-ion battery, it can store a large amount of energy and achieve a long standby time. At the same time, a power module with a safety protection function is added to the power supply system, so that users can use it with more confidence, and it can protect the lithium-ion battery when it enters low voltage, thereby protecting the battery from over-discharge damage caused by low voltage. At the same time, it has the ability of reverse charging and can charge other devices.

[0049] (2) Anti-interference structure

[0050] The whole shell of the machine is made of aluminum alloy and acrylic. A shielding structure is established between each unit in the bottom sensing part to eliminate the interference between units, as well as the interference of the power supply to the sensing circuit and the interference of strong external electromagnetic. We will use copper or aluminum plates for partition and shielding.

[0051] (3) Induction circuit

[0052] When current passes through the dark wire in the wall, its alternating current will generate a weak alternating magnetic field. According to the law of electromagnetic induction, the induced voltage changes at both ends of the magnetic head coil in the handheld portable line finder can be visualized. When the current in the coil and the energized cable is constant, the induced voltage U at both ends of the magnetic head coil is inversely proportional to r. The closer the magnetic head coil is to the energized wire, the stronger the induced voltage. This principle can be used to find the signal, that is, to find the closest point to the dark wire in the wall, so as to determine the position of the dark wire. The multi-point measurement method can be used to perform accurate measurements.

[0053] (4) External structure

[0054] The present invention adopts acrylic and ABS materials to make the shell, which is convenient and compact, and has good portability, and can be carried with you and taken with you. At the same time, it has a good appearance and is pleasing to the eye and pleasant to use. At the same time, a charging interface is reserved, and the commonly used mobile phone charging interface can be compatible with daily chargers such as mobile phone chargers, which greatly provides convenience and comfort.

[0055] like Figure 2As shown, Embodiment 2 of the present invention provides a visual handheld portable line finder, which includes a shell, a lower layer induction circuit board 10, a power supply circuit board 4, an upper layer screen-carrying circuit board 2, a power supply circuit and one or more dark line detection circuits arranged in sequence from bottom to top in the shell; one or more magnetic head coils and induction circuits in the dark line detection circuits are arranged on the lower layer induction circuit board; one or more status display circuits in the dark line detection circuits are arranged on the upper layer induction circuit; the induction circuit and the status display circuit are connected by a flat cable; the power supply circuit is arranged on the power supply circuit board. The lower layer induction circuit board, the power supply circuit board and the upper layer screen-carrying circuit board are fixed by a support column 3.

[0056] A shielding ring 6 is disposed outside each magnetic head coil, and the material of the shielding ring is copper sheet metal.

[0057] As a specific implementation, 9 measuring points are set at the bottom of the device for measurement, that is, the number of dark line detection circuits is 9, which is 8 more measuring points than the traditional measuring equipment, and can more accurately judge the situation of the live wires under the wall. At the same time, because of the ability of multi-point measurement, the device has the ability to judge whether the wires under the wall are turned, so that it can better detect the situation under the wall. Since electromagnetic radiation radiates outward in a spherical shape, in order to avoid misjudgment caused by a signal being detected by multiple sensors, the present invention uses copper sheets to make a metal shielding cover of a specific shape around each sensor (head coil) so that it can only sense the electromagnetic signal directly below the sensor, avoiding misdetection of the sensor. Specifically, the measuring point is at the bottom of the device, and the specific structure of the metal shielding cover is a ring made of copper sheet metal, which is welded at the bottom to play a shielding role, and what is wrapped is the induction element (head coil), and the head coil is an induction device made of an I-shaped inductor.

[0058] The power supply circuit includes a lithium-ion battery 11, and the power supply module adopts the SW6208 power supply chip, which supports protection mechanisms such as overvoltage and overcurrent protection and short circuit protection, and also supports multiple output fast charging protocols to achieve reverse power supply requirements.

[0059] The battery type can be set by FLED / BSET of SW6208 power chip. When VCC is pulled up by 10KΩ resistor, it is set to 4.2V battery; when VCC is pulled up by 15KΩ resistor, it is set to 4.35V battery; when VCC is pulled up by 5.6KΩ resistor, it is set to 4.4V battery; when VCC is pulled up by 3KΩ resistor, it is set to 4.5V battery.

[0060] SW6208 integrates a Type-C interface controller, which not only supports bidirectional input and output, but also supports the try.SRC role. When the adapter is connected, the chip automatically powers on and charges; when the adapter is unplugged, charging stops automatically. When the power device is connected, the boost module starts working. If the power device is unplugged, the boost module is automatically turned off. When the power device is connected and the boost function is turned on, SW6208 will broadcast 3A current capability on the CC pin. If VBUSB / Lightning is connected, 3A current capability will also be broadcast on CC.

[0061] The power module is connected to the lithium-ion battery, the charging interface 5, the power output interface 4 and the induction circuit respectively; the power module, the charging interface and the power output interface are all arranged on the power circuit board; the lithium-ion battery is fixedly arranged on the power circuit board. The design of the power supply realizes the protection of the internal battery so that it can realize the charging and discharging functions. At the same time, based on the function of the SW6208 chip, two input charging ports, Micro USB and Type-c, are arranged on the circuit board so that it can adapt to a variety of charging interfaces to increase convenience. At the same time, the device can provide the function of reverse power supply. Two USB interfaces are arranged on the side in the same direction as the charging interface, so that it can be used as a tool and also as a mobile power supply to provide power for mobile phones, flashlights and other devices.

[0062] The shell includes an outer shell 8, a rear panel 9, a front panel 7 and a translucent black acrylic plate 1; an observation window is provided on the top surface of the outer shell, the translucent black acrylic plate is arranged on the observation window, the front panel and the rear panel are arranged at the front and rear ends of the outer shell respectively; a charging interface and a power output interface hole are provided on the front panel. The outer shell is basically made of ABS material for 3D printing, and anti-slip stripes are set on the side of the outer shell to prevent it from falling when held in the hand. The upper part is encapsulated with a translucent acrylic plate, and the screen on the bottom circuit board can be directly seen. Due to the acrylic encapsulation, it also has a certain waterproof ability.

[0063] The installation method is: the upper screen-carrying circuit board is inserted into the outer shell and fixed using its own size, and the power supply circuit board is fixed on the upper screen-carrying circuit board through supporting elements such as supporting columns (copper columns), and the lower sensor circuit board is also fixed on the copper columns.

[0064] Among them, one sensing element (head coil) corresponds to one LED, and they do not interfere with each other. The lower sensing circuit board corresponds to the upper screen-carrying circuit board. When the lower sensing has a signal, the corresponding LED on the upper screen-carrying circuit board at the same position will light up.

[0065] The power module is responsible for charging and discharging the lithium-ion battery, as well as supplying power and reverse charging to the upper screen-carrying circuit board and the lower induction circuit board. Only the positive and negative wires of the power supply are connected to the lower induction circuit board.

[0066] There are only 9 LEDs, 9 current limiting resistors and a 10P XH flat cable terminal in the upper screen-carrying circuit board. (This flat cable terminal is used to connect the 10P of the lower sensor circuit board. The 10P XH flat cable corresponds to one line for each LED and one GND line). The upper screen-carrying circuit board uses a 10P flat cable to connect to the lower sensor circuit board.

[0067] The lower sensor circuit board is composed of 9 NE555 and peripheral components (except LED and its current limiting resistor) plus a 10P XH cable terminal.

[0068] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0069] 1. You can directly judge the situation of live wires under the wall through the screen

[0070] 2. Use metal to wrap the measuring element to shield other interference and have good anti-interference ability

[0071] 3. Compared with similar products on the market, it has greater economic benefits

[0072] 4. It has the ability of reverse charging and can provide power to charging devices such as mobile phones and flashlights

[0073] 5. The shell is ergonomically designed, making it convenient and comfortable to use.

[0074] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0075] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A visual handheld portable line finder, characterized in that: The line finder comprises a housing, in which a lower layer sensing circuit board, a power supply circuit board, an upper layer screen-carrying circuit board, a power supply circuit and one or more dark line detection circuits are arranged in sequence from bottom to top; The dark line detection circuit comprises: a magnetic head coil, an induction circuit and a status display circuit; The magnetic head coil is connected to the induction circuit, and is used to sense the alternating magnetic field generated when an alternating current is passed through the dark wire, and convert the alternating magnetic field into a voltage signal and output it to the induction circuit; The sensing circuit is connected to the state display circuit, and the sensing circuit is used to convert the voltage signal into a binary signal, wherein the binary signal indicates whether there is a dark line or no dark line under the magnetic head coil; The state display circuit is used to display the binary signal; The sensing circuit includes a NE555 chip; Pins 2 and 6 of the NE555 chip are connected to the two ends of the magnetic head coil respectively; Pin 3 of the NE555 chip is connected to the status display circuit; The status display circuit includes an LED lamp and a current limiting resistor; The LED lamp and the current limiting resistor are connected in series between pin 3 of the NE555 chip and the ground; The magnetic head coil is an I-shaped inductor; One or more magnetic head coils and induction circuits in the dark line detection circuit are arranged on the lower induction circuit board; One or more status display circuits in the dark line detection circuit are arranged on the upper screen-carrying circuit board; The sensing circuit and the status display circuit are connected via a flat cable; The power circuit is arranged on the power circuit board.

2. The visual handheld portable line finder according to claim 1, characterized in that: A shielding ring is arranged outside each magnetic head coil, and the material of the shielding ring is copper plate metal.

3. The visual handheld portable line finder according to claim 1, characterized in that: The power supply circuit includes a lithium-ion battery and a power module; The power module is respectively connected to the lithium-ion battery, the charging interface, the power output interface and the induction circuit; The power module, the charging interface and the power output interface are all arranged on the power circuit board; The lithium-ion battery is fixedly arranged on the power circuit board.

4. The visual handheld portable line finder according to claim 1 or 3, characterized in that: The housing comprises an outer shell, a rear panel, a front panel and a translucent black acrylic plate; An observation window is provided on the top surface of the housing, the translucent black acrylic plate is arranged on the observation window, and the front panel and the rear panel are arranged at the front end and the rear end of the housing respectively; The front panel is provided with a charging interface and a power output interface hole.

5. The visual handheld portable line finder according to claim 1, characterized in that: The lower layer induction circuit board, the power circuit board and the upper layer screen-carrying circuit board are fixed by supporting columns.

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