Common mode inductor with electric leakage detection function

Abstract

The utility model relates to the technical field of electronic components, and discloses a common mode inductor with an electric leakage detection function, which comprises a magnetic core, winding coils are wound on the front side and the rear side of the outer wall of the magnetic core, the bottom of the magnetic core is fixedly connected with a protective shell I, and a protective shell II is arranged at the top of the protective shell I; protective layers are fixedly connected to the inner walls of the first protective shell and the second protective shell, a mounting plate is fixedly connected to the bottoms of the protective layers, an isolation shell is fixedly connected to the right side of the top end of the mounting plate, and a current transformer is fixedly connected to the left side of the inner wall of the isolation shell. According to the utility model, the right side of the outer wall of the magnetic core is provided with the detection coil which is connected with the current transformer, induction current is generated at the primary side of the transformer by utilizing magnetic field change during electric leakage, effective electric leakage signals are extracted after being processed by the signal processor, the current is displayed and sent to the control module, and the protection switch is controlled to cut off a circuit when the signals exceed a threshold value; and the circuit safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic components technical field especially, relate to a common mode inductance with leakage detection function. BACKGROUND

[0002] Common mode circuit is a kind of circuit structure, mainly used to handle common mode signal, common mode signal refers to the signal component that simultaneously appears on the two or more transmission lines of circuit, and equal in size, same direction, common mode circuit is used to suppress common mode interference, guarantee the accuracy and integrity of signal transmission.

[0003] The coil winding of common mode inductance is wound by insulating enamel wire, with the passage of time, environmental temperature changes, long-term high voltage stress or mechanical vibration, the insulating paint will appear aging, cracking or even peeling, when the insulating layer is damaged, the current in coil winding leaks to the surrounding conductive medium through the damaged place, thereby generating leakage phenomenon, thus need to use a common mode inductance with leakage detection function.

[0004] Traditional detection whether common mode leaks mainly through using multimeter, places multimeter in resistance measurement position, connects red test pen to power line, black test pen connects ground wire, reading should be within a certain range under normal circumstances, if exceed range or no resistance value display, it shows that there may be leakage, but the operation process is relatively complex, prior art measures the insulation resistance of common mode circuit by using insulation resistance tester, if insulation resistance value is lower than normal range, it shows that circuit may exist leakage risk, this method is simple to operate, but cannot monitor leakage current size in real time, and cannot close power supply in first time after detecting common mode leakage, reduce the practicability of device. UTILITY MODEL CONTENTS

[0005] In order to make up for the above insufficient, the utility model provides a common mode inductance with leakage detection function, aims at improving the prior art that using insulation resistance tester cannot monitor leakage current size in real time, and cannot close power supply in first time after detecting common mode leakage, reduces the practicability of device.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: a common mode inductance with electric leakage detection function, including the magnetic core, the outer wall of magnetic core is wound with winding coil on the front and back sides, the bottom of magnetic core is fixedly connected with protective shell no.

[0007] As a further description of the above technical scheme:

[0008] The clamping mechanism includes two positioning plates, two positioning plates are fixedly connected on the bottom front and back sides of the isolation cover, the side away from each other of two positioning plates is rotatably connected with a rotating plate, the side away from each other of positioning plate is fixedly connected with a plurality of springs, the other end of a plurality of springs is fixedly connected with corresponding rotating plate, the top front and back sides of isolation shell are provided with a sliding groove one, two springs are respectively slidably connected with corresponding sliding groove one, the outer wall of isolation shell is provided with a clamping groove on the front and back sides, the inner wall of two clamping grooves is slidably connected with a sliding block one.

[0009] As a further description of the above technical scheme:

[0010] The top of protective shell no. four quarters are provided with a plurality of positioning holes, the bottom of protective shell no. four quarters are fixedly connected with a plurality of positioning rods, a plurality of positioning rods are respectively clamped with corresponding positioning hole.

[0011] As a further description of the above technical scheme:

[0012] The top of protective shell no. four quarters are provided with a plurality of positioning holes, the bottom of protective shell no. four quarters are fixedly connected with a plurality of positioning rods, a plurality of positioning rods are respectively clamped with corresponding positioning hole.

[0013] As a further description of the above technical scheme:

[0014] The top of positioning rod is fixedly connected with mounting seat, the inner wall of mounting seat is fixedly connected with alarm lamp.

[0015] As a further description of the above technical scheme:

[0016] The outer wall of the two anti-skid pads is fixedly connected with a plurality of anti-skid blocks.

[0017] As a further description of the above technical solution:

[0018] The inner wall of the two clamping grooves is provided with a sliding groove two on the left and right sides, and the outer wall of the two sliding blocks one is fixedly connected with a sliding block two on the left and right sides.

[0019] As a further description of the above technical solution:

[0020] The bottom left and right sides of the mounting plate are fixedly connected with mounting feet, and the bottom front and rear sides of the two mounting feet are threadedly connected with screws.

[0021] The utility model has the following beneficial effects:

[0022] 1、 the utility model discloses a detection coil is set up to the right side of the outer wall of the magnetic core, and is electrically connected with the current transformer, can produce induced current in the primary side of the current transformer when the electric leakage occurs, and the effective electric leakage signal is extracted and the current size is shown after amplification and filter processing of signal processor, then is sent to the control module, when the signal exceeds the threshold value, the control module controls the protection switch to cut off the circuit, prevents the electric leakage current from continuing to flow, greatly improves the circuit security.

[0023] 2、 the utility model discloses a positioning plate is aligned with the sliding groove one on the isolation shell, utilizes the elastic force of spring and the rotation mechanism of rotation plate, makes the isolation cover convenient to operate in the installation process, along with the isolation cover close to the isolation shell, when the rotation plate is rotated and compresses the spring under external force, when reaching the appropriate position, is also automatically clamped into the clamping groove under the spring elastic force, and the sliding block one is further positioned in the sliding of the clamping groove, to install the isolation cover quickly. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A three-dimensional view of the common mode inductor with electric leakage detection function is provided for the utility model;

[0025] Figure 2 A partial structure schematic view of the common mode inductor with electric leakage detection function is provided for the utility model;

[0026] Figure 3 A partial structure split view of the common mode inductor with electric leakage detection function is provided for the utility model;

[0027] Figure 4 A clamping mechanism schematic view of the common mode inductor with electric leakage detection function is provided for the utility model;

[0028] Figure 5 A partial structure display drawing of the common mode inductor with the leakage detection function is provided.

[0029] Legend:

[0030] 1, magnetic core; 2, clamping mechanism; 201, positioning plate; 202, rotating plate; 203, spring; 204, sliding groove one; 205, clamping groove; 206, sliding block one; 3, winding coil; 4, protective shell one; 5, protective shell two; 6, protective layer; 7, mounting plate; 8, isolation shell; 9, current transformer; 10, detection coil; 11, signal processor; 12, control module; 13, protection switch; 14, isolation layer; 15, positioning hole; 16, positioning rod; 17, heat dissipation hole; 18, mounting seat; 19, alarm lamp; 20, non-slip pad; 21, non-slip block; 22, sliding groove two; 23, sliding block two; 24, mounting foot; 25, screw; 26, isolation cover. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] Reference Figure 1 , Figure 2 and Figure 3The utility model provides a kind of embodiment with leakage detection function's common mode inductance, including magnetic core 1, magnetic core 1 is the core component of common mode inductance, mainly for providing magnetic circuit, enhancing inductive effect, concentrating magnetic field to realize the suppression to common mode interference, the outer wall of magnetic core 1 is wound with winding coil 3 in front and back, two winding coils 3 are wound to opposite and same number of turns, the magnetic field generated to normal differential mode signal is mutually offset, and superimposed magnetic field to common mode signal is inhibited, the bottom of magnetic core 1 is fixedly connected with protective shell one 4, the top of protective shell one 4 is provided with protective shell two 5, protective shell one 4 and protective shell two 5 jointly provide physical protection for the magnetic core 1 and winding coil 3 of common mode inductance, prevent it from being influenced by outside, the inner wall of protective shell one 4 and protective shell two 5 is fixedly connected with protective layer 6, protective layer 6 further enhances the protection to common mode inductance internal element, simultaneously has the function of insulation and heat insulation, the bottom of protective layer 6 is fixedly connected with mounting plate 7, and mounting plate 7 provides installation base for common mode inductance, so that it can be fixed in specific position, facilitate layout and connection in circuit, the top end right side of mounting plate 7 is fixedly connected with isolation shell 8, the inner wall left side of isolation shell 8 is fixedly connected with current transformer 9, the outer wall right side of magnetic core 1 is wound with detection coil 10, detection coil 10 is used to induct the magnetic field change of leakage current, and current transformer 9 amplifies and transmits the weak signal detected, the two ends of detection coil 10 are electrically connected with current transformer 9, the inner wall middle part of isolation shell 8 is fixedly connected with signal processor 11, signal processor 11 amplifies, filters and compares the leakage signal transmitted by current transformer 9, the inner wall right side of isolation shell 8 is fixedly connected with control module 12, the top of control module 12 is fixedly connected with protection switch 13, control module 12 judges whether there is leakage and whether leakage current exceeds set threshold according to the output result of signal processor 11, and controls the on-off of protection switch 13, realizes the automatic protection to circuit, the top of isolation shell 8 is provided with isolation cover 26, the inner wall of isolation shell 8 and isolation cover 26 is fixedly connected with isolation layer 14, isolation cover 26 and isolation layer 14 provide further protection for the element inside isolation shell 8, prevent outside electromagnetic interference and physical damage, the bottom of isolation cover 26 is provided with clamping mechanism 2, and clamping mechanism 2 is used for quick connection isolation shell 8 and isolation cover 26;The top of protective shell one 4 is provided with a plurality of positioning holes 15 around, the bottom of protective shell two 5 is fixedly connected with a plurality of positioning rods 16 around, a plurality of positioning rods 16 are respectively clamped with corresponding positioning hole 15, the clamping structure of positioning rod 16 and positioning hole 15 is used for quick and accurate connection protective shell one 4 and protective shell two 5, ensure the relative position between both is fixed, improve the installation efficiency and stability of protective shell;

[0033] Specifically, when there is a leakage situation, the leakage current will generate a magnetic field change in the detection coil 10 wound on the right side of the outer wall of the magnetic core 1. The detection coil 10 is electrically connected to the current transformer 9 at both ends. This magnetic field change will generate an induced current on the primary side of the current transformer 9. The secondary side of the current transformer 9 transmits the induced current to the signal processor 11. The signal processor 11 amplifies, filters, and processes the current signal to remove interference signals and extract effective signals that can reflect the leakage situation. Then, the signal processor 11 sends the processed signal to the control module 12. The control module 12 compares and judges the received signal according to the preset threshold value. If the signal exceeds the threshold value, the control module 12 sends a control signal to the protection switch 13. When the protection switch 13 receives the signal, it cuts off the circuit, thereby preventing the leakage current from continuing to flow in the circuit. The protective shell one 4 and the protective shell two 5 form a relatively closed space to protect the magnetic core 1 and the winding coil 3 from physical damage, dust, and moisture interference. The inner walls of the isolation shell 8 and the isolation cover 26 are provided with an isolation layer 14 to prevent electromagnetic interference between circuit elements and ensure the normal operation of the leakage detection and protection function. When installing the protective shell two 5 onto the protective shell one 4, align the positioning rod 16 with the positioning hole 15, then apply appropriate pressure. When the positioning rod 16 is completely inserted into the positioning hole 15, the protective shell two 5 is accurately positioned above the protective shell one 4, achieving the preliminary fixation and precise determination of the relative position of the two.

[0034] Reference Figure 4 and Figure 5The engaging mechanism 2 comprises two positioning plates 201 fixedly connected to the front and rear sides of the bottom of the isolation cover 26, the positioning plates 201 serving as a base support and positioning, the side away from each other of the two positioning plates 201 is rotatably connected with a rotating plate 202, the rotating plate 202 can rotate by a certain angle around the connecting point with the positioning plate 201, and can be adjusted in rotation according to the position and angle of the clamping groove 205, the side away from each other of the positioning plate 201 is fixedly connected with a plurality of springs 203, the other end of the plurality of springs 203 is fixedly connected with the corresponding rotating plate 202, the spring 203 keeps the rotating plate 202 in a specific position by its own elastic force, so as to realize stable engaging effect, the top of the isolation shell 8 is provided with a sliding groove 204 on the front and rear sides, the positioning plate 201 and the rotating plate 202 can slide in the sliding groove 204, the two springs 203 are slidably connected with the corresponding sliding groove 204, the outer wall of the isolation shell 8 is provided with a clamping groove 205 on the front and rear sides, when the rotating plate 202 slides to be consistent with the height of the clamping groove 205, the rotating plate 202 rotates under the elastic force of the spring 203 and is clamped in the clamping groove 205, the inner wall of the two clamping grooves 205 is slidably connected with a sliding block 206, the sliding block 206 can slide in the clamping groove 205, when the rotating plate 202 is clamped in the clamping groove 205, the rotating plate 202 pushes the sliding block 206 to slide outward; the side away from each other of the two sliding blocks 206 is fixedly connected with a non-slip pad 20, the outer wall of the two non-slip pads 20 is fixedly connected with a plurality of anti-skid blocks 21, the non-slip pad 20 and the anti-skid block 21 can increase the friction between the hand and the sliding block 206, and prevent the hand from slipping when pressing the sliding block 206; the inner wall of the two clamping grooves 205 is provided with a sliding groove 22 on the left and right sides, the outer wall of the two sliding blocks 206 is fixedly connected with a sliding block 23, when the sliding block 206 is clamped, pulled out and slid in the clamping groove 205, the sliding block 23 will slide along the corresponding sliding groove 22 synchronously, and the sliding groove 22 provides a precise guide path for the sliding of the sliding block 206;

[0035] Specifically, the positioning plate 201 is matched with the sliding groove 204 on the isolation shell 8, the rotating plate 202 is in an initial position under the elastic force of the spring 203, as the isolation cover 26 gradually approaches the isolation shell 8, the rotating plate 202 is pressed by external force and starts to rotate around the connecting point with the positioning plate 201, and the spring 203 is compressed at the same time, when the isolation cover 26 continues to be pressed to the appropriate position, the rotating plate 202 is automatically clamped into the clamping groove 205 on the outer wall of the isolation shell 8 under the elastic recovery of the spring 203, at this time, the sliding block 206 slides to the corresponding position in the clamping groove 205, which further limits the rotating plate 202, and the clamping and installation of the isolation cover 26 and the isolation shell 8 are completed, when the isolation cover 26 needs to be disassembled, the sliding block 206 is manually pushed out of the clamping groove 205, so that the rotating plate 202 can be detached from the clamping groove 205, and then the rotating plate 202 rotates around the connecting point under the further deformation of the spring 203, and the clamping state of the rotating plate 202 and the clamping groove 205 is separated, so that the isolation cover 26 is removed from the isolation shell 8, facilitating the maintenance of the components in the isolation shell 8; the non-slip pad 20 and the non-slip block 21 can increase the friction between the hand and the sliding block 206, preventing the hand from slipping when pressing the sliding block 206; when the sliding block 206 is clamped, pulled out and slid in the clamping groove 205, the sliding block 23 will slide along the corresponding sliding groove 22 synchronously, and the sliding groove 22 provides a precise guide path for the sliding of the sliding block 206.

[0036] Referring to Figure 1 , Figure 2 and Figure 3 , a plurality of heat dissipation holes 17 are formed in the top of the protective shell 5, and the plurality of heat dissipation holes 17 are respectively arranged equidistantly on the left and right sides of the top of the protective shell 5, in the working process of the common mode inductor, the magnetic core 1 and the winding coil 3 generate heat due to the current passing through, and the existence of the heat dissipation holes 17 provides a way for heat dissipation; the top of the positioning rod 16 is fixedly connected with a mounting seat 18, the inner wall of the mounting seat 18 is fixedly connected with an alarm lamp 19, and the mounting seat 18 provides installation space for the alarm lamp 19, when there is a leakage in the circuit, the alarm lamp 19 is lit to remind the staff; the bottom left and right sides of the mounting plate 7 are fixedly connected with mounting feet 24, the bottom front and back sides of the two mounting feet 24 are threadedly connected with screws 25, the mounting feet 24 ensure that there is enough contact area to adhere to the mounting plane, the screws 25 are gradually screwed into the screw holes previously provided on the mounting plane through the mounting feet 24, and stable installation of the common mode inductor is realized;

[0037] Specifically, during the operation of the common mode inductor, the magnetic core 1 and the winding coil 3 generate heat due to the current passing through, and the presence of the heat dissipation hole 17 provides a way for the heat to dissipate, ensuring that the common mode inductor can work stably in a suitable temperature environment and prolong its service life; the mounting seat 18 provides installation space for the alarm lamp 19, which lights up when there is a leakage in the circuit, reminding the staff; the mounting foot 24 ensures sufficient contact area with the mounting plane, and the screw 25 is gradually screwed into the screw hole previously set in the mounting plane through the mounting foot 24, realizing stable installation of the common mode inductor.

[0038] Working principle: When a leakage occurs, the leakage current will generate a magnetic field change in the detection coil 10 wound on the right outer wall of the magnetic core 1, and the detection coil 10 is electrically connected to the current transformer 9 at both ends. The magnetic field change will generate an induced current at the primary side of the current transformer 9, and the secondary side of the current transformer 9 will transmit the induced current to the signal processor 11. The signal processor 11 processes the current signal by amplification, filtering, etc., removes interference signals, extracts effective signals that can reflect the leakage situation, and displays the size of the leakage current in real time. Then the signal processor 11 sends the processed signal to the control module 12, which compares and judges the received signal according to the preset threshold. When the signal exceeds the threshold, the control module 12 sends a control signal to the protection switch 13, which cuts off the circuit after receiving the signal, thereby preventing the leakage current from continuing to flow in the circuit. The protective shell one 4 and the protective shell two 5 form a relatively closed space to protect the magnetic core 1 and the winding coil 3 from physical damage, dust and moisture interference from the outside world. The inner walls of the isolation shell 8 and the isolation cover 26 are provided with an isolation layer 14 to prevent electromagnetic interference between circuit elements and ensure the normal operation of the leakage detection and protection function.

[0039] And by positioning the slide groove one 204 on the isolation shell 8 with the positioning plate 201, the rotating plate 202 is in an initial position under the elastic force of the spring 203. As the isolation cover 26 gradually approaches the isolation shell 8, the rotating plate 202 is pressed by external force and starts to rotate around the connection point with the positioning plate 201, while compressing the spring 203. When the isolation cover 26 continues to press to the appropriate position, the rotating plate 202 is automatically clamped into the clamping groove 205 on the outer wall of the isolation shell 8 under the elastic recovery of the spring 203. At this time, the sliding block one 206 slides to the corresponding position in the clamping groove 205, which further limits the rotating plate 202, and the clamping installation of the isolation cover 26 and the isolation shell 8 is completed.

[0040] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A common mode inductor with leakage detection function, comprising a magnetic core (1), characterized in that: The outer wall of the magnetic core (1) is wound with winding coils (3) on the front and back sides, the bottom of the magnetic core (1) is fixedly connected with a protective shell one (4), the top of the protective shell one (4) is provided with a protective shell two (5), the inner walls of the protective shell one (4) and the protective shell two (5) are fixedly connected with protective layers (6), the bottom of the protective layer (6) is fixedly connected with a mounting plate (7), the top right side of the mounting plate (7) is fixedly connected with an isolation shell (8), the inner wall left side of the isolation shell (8) is fixedly connected with a current transformer (9), the outer wall right side of the magnetic core (1) is wound with a detection coil (10), both ends of the detection coil (10) are electrically connected with the current transformer (9), the inner wall middle part of the isolation shell (8) is fixedly connected with a signal processor (11), the inner wall right side of the isolation shell (8) is fixedly connected with a control module (12), the top of the control module (12) is fixedly connected with a protective switch (13), the top of the isolation shell (8) is provided with an isolation cover (26), the inner walls of the isolation shell (8) and the isolation cover (26) are fixedly connected with isolation layers (14), the bottom of the isolation cover (26) is provided with a clamping mechanism (2), and the clamping mechanism (2) is used for quickly connecting the isolation shell (8) and the isolation cover (26).

2. The common mode inductor with leakage detection function according to claim 1, characterized in that: The clamping mechanism (2) comprises two positioning plates (201), the two positioning plates (201) are fixedly connected to the bottom of the isolation cover (26) on the front and back sides, respectively, the sides away from each other of the two positioning plates (201) are rotatably connected with rotating plates (202), the sides away from each other of the positioning plates (201) are fixedly connected with a plurality of springs (203), the other ends of the plurality of springs (203) are fixedly connected with the corresponding rotating plates (202), the top of the isolation shell (8) is provided with a plurality of sliding grooves one (204) on the front and back sides, respectively, the two springs (203) are slidably connected with the corresponding sliding grooves one (204), respectively, and the outer walls of the isolation shell (8) are provided with clamping grooves (205) on the front and back sides, respectively, the inner walls of the two clamping grooves (205) are slidably connected with sliding blocks one (206).

3. The common mode inductor with leakage detection function according to claim 1, characterized in that: A plurality of positioning holes (15) are formed in the top of the protective shell one (4), a plurality of positioning rods (16) are fixedly connected to the bottom of the protective shell two (5), and the positioning rods (16) are clamped with the corresponding positioning holes (15), respectively.

4. The common mode inductor with leakage detection function according to claim 1, characterized in that: A plurality of heat dissipation holes (17) are formed in the top of the protective shell two (5), and the heat dissipation holes (17) are equidistantly arranged on the left and right sides of the top of the protective shell two (5), respectively.

5. The common mode inductor with leakage detection function according to claim 3, characterized in that: The top of the positioning rod (16) is fixedly connected with a mounting seat (18), and the inner wall of the mounting seat (18) is fixedly connected with an alarm lamp (19).

6. The common mode inductor with leakage detection function according to claim 2, characterized in that: The sides away from each other of the two sliding blocks one (206) are fixedly connected with anti-skid pads (20), and the outer walls of the two anti-skid pads (20) are fixedly connected with a plurality of anti-skid blocks (21).

7. The common mode inductor with leakage detection function according to claim 2, characterized in that: The inner wall of each of the two card slots (205) is provided with a sliding groove two (22) on the left and right sides, and the outer wall of each of the two sliding blocks one (206) is fixedly connected with a sliding block two (23) on the left and right sides.

8. The common mode inductor with leakage detection function according to claim 1, characterized in that: The bottom left and right sides of the mounting plate (7) are fixedly connected with mounting feet (24), and the bottom front and back sides of the two mounting feet (24) are threadedly connected with screws (25).

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