CN213244680U

CN213244680U - Power filter with high-efficient electromagnetism is kept apart and high-efficient heat dissipation function

Info

Publication number: CN213244680U
Application number: CN202022467902.XU
Authority: CN
Inventors: 段晓波; 唐小辉; 李瑾; 计禹钧; 彭胜勇
Original assignee: Chengdu Hongming Electronics Co Ltd
Current assignee: Chengdu Hongming Electronics Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-05-18
Anticipated expiration: 2030-10-30

Abstract

The utility model discloses a power filter with high-efficient electromagnetism is kept apart and high-efficient heat dissipation function, include the shell and locate filter circuit in the shell still includes heat abstractor, lead wire welding set and inductance installation device, and filter circuit includes interconnect's the device and the annular inductance of circle that generate heat, is equipped with a plurality of independent inner chambers that keep apart each other and be used for installing different independent devices through the baffle in the shell, and heat abstractor includes high coefficient of thermal conductivity's conducting strip, and the conducting strip is located and is corresponded generate heat between device and the shell inner wall and respectively with corresponding generate heat device and shell inner wall in close contact with, the region that corresponds with the device that generates heat on the outer wall of shell is equipped with the radiating fin of a plurality of evaginations. The utility model discloses can realize good electromagnetic shield effect and good electromagnetic compatibility between each electronic component, can realize partial electronic component's independent maintenance again, practice thrift use cost to can realize high-efficient radiating effect, be particularly useful for high-power supply filter.

Description

Power filter with high-efficient electromagnetism is kept apart and high-efficient heat dissipation function

Technical Field

The utility model relates to a mainly used electric machine system's power filter especially relates to a power filter with high-efficient electromagnetism is kept apart and high-efficient heat dissipation function.

Background

The power supply filter is an electrical device which effectively filters a frequency point with a specific frequency in a power line or frequencies except the frequency point, and the power supply filter is connected into the power line to obtain a power supply signal with the specific frequency or eliminate the power supply signal with the specific frequency.

With the increase of application scenes, the power filter provides higher requirements in the aspects of electromagnetic compatibility, convenience in maintenance, high-efficiency heat dissipation and the like, the traditional power filter is difficult to meet the increasingly improved comprehensive performance requirements, and the specific problems are as follows:

the shell inner chamber of traditional power filter generally is a whole inner chamber, for satisfying various experimental demands, can carry out the embedment through the casting glue after having installed various electronic component and fix, so there is following defect: the shielding effect and the electromagnetic compatibility among all electronic elements are poor; the independent maintenance of part of electronic elements can not be realized, and the elements are generally replaced integrally once damaged, so that the use cost is increased.

The heat dissipation mode of traditional power filter is direct contact's heat transfer process generally, is to the heat that heating element produced transmits the shell through direct contact's shell or through the pouring sealant and realizes the heat dissipation for the shell, has following defect: the heat dissipation effect is not enough, the temperature in the shell rises quickly, and electronic elements and the filter can be damaged in serious conditions.

The lead wire connection of the traditional power filter adopts a conventional screw or eyelet welding mode, and has the following problems: insulation substrates are not purposefully arranged, an insulation function is generally realized by arranging a certain distance, and a lead connection function is realized through connecting columns and the like, so that the insulation performance and the safety performance are insufficient, and a good lead connection function is inconvenient to realize; meanwhile, the welding is not stable enough for the lead connection of large current and high voltage, the traditional power filter has the problems of large connecting resistance, serious voltage loss caused by large voltage division, and circuit faults caused by the fact that soldering tin melting and diffusion can be generated at the connecting position.

The inductor of the traditional power filter adopts simple bracket installation and has the following defects: for a large-volume and heavy inductor required by large current, stable installation is difficult to realize, and the inductor is easy to loosen and damage in a vibrating use environment.

The filter circuit of the traditional power filter is not provided with a circuit for preventing reverse connection, and has the following defects: if the wrong operation occurs and the positive and negative electrodes of the power input are connected reversely, the filter circuit can be broken down and damaged due to reverse voltage.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a power filter with high-efficient electromagnetism is kept apart and high-efficient heat dissipation function just in order to solve above-mentioned problem.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

a power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions comprises a shell and a filter circuit arranged in the shell, the filter circuit comprises a heating device and a circular inductor which are mutually connected, the power filter also comprises a heat dissipation device for dissipating heat of the heating device, a lead welding device for welding and connecting a plurality of leads and an inductor installation device for installing the inductor, a plurality of independent inner cavities which are mutually isolated by partition plates and used for installing different independent devices are arranged in the shell, the heat dissipation device comprises a heat conduction sheet with high heat conductivity coefficient, the heat conduction sheet is arranged between the corresponding heating device and the inner wall of the shell and is respectively in close contact with the corresponding heating device and the inner wall of the shell, and a plurality of convex radiating fins are arranged on the outer wall of the shell in the area corresponding to the heating device. The heating device comprises electronic elements such as resistors and the like, which are determined according to actual conditions; the annular inductor is a common-mode inductor generally, has large volume and weight, and is difficult to realize stable installation by adopting a conventional mode; the lead is used for connecting different electronic elements, and for the lead which needs to transmit large current, the conventional connection mode is difficult to realize stable connection with good anti-vibration effect due to the large diameter of the lead.

As preferred, for making independent inner chamber realize the all-round isolation effect of length and breadth direction, establish the bottom plate of shell is horizontal just the open-top of shell installs the apron, the baffle includes vertical baffle and transverse baffle, and is a plurality of the lower extreme of vertical baffle with the bottom plate inner wall connection and the integrated into one piece of shell, be equipped with a plurality of vertical installation bosss on the curb plate inner wall of shell, it is a plurality of the upper portion of vertical baffle and a plurality of the upper portion of installation boss corresponds each other and through one or more transverse baffle connects and forms a plurality of same or different in height independent inner chamber.

Preferably, in order to facilitate concentrated heat dissipation of the heat generating device, the plurality of independent inner cavities include an independent inner cavity for concentrated installation of the heat generating device, and the area where the heat dissipation fin is located corresponds to the area where the independent inner cavity is located.

Preferably, in order to position the heat conducting fins to achieve a better heat conducting effect, raised positioning ribs are respectively arranged at positions on the inner wall of the bottom plate of the housing corresponding to one or more of the heat conducting fins, one or more heat conducting areas for mounting the heat conducting fins are defined by the plurality of positioning ribs, and one or more of the heat conducting fins are arranged in the corresponding one or more heat conducting areas.

Preferably, in order to improve the heat dissipation effect, the shell is an aluminum alloy shell, and the heat conducting fins are silica gel fins.

Preferably, in order to realize stable connection of the large-diameter lead and realize a good insulation effect, the lead welding device comprises an insulation base plate and a welding piece, wherein the insulation base plate is provided with a plurality of welding piece mounting holes with the same appearance as the welding piece, the welding piece is provided with at least two large welding counter bores which are isolated by an isolation rib plate and used for welding the large-diameter lead, and the welding pieces are respectively arranged in the welding piece mounting holes.

Preferably, in order to facilitate connection of the small-diameter lead, installation of a welding piece on the insulating substrate and installation of the capacitor, at least two small welding counter bores for welding the small-diameter lead are further formed in the welding piece, connecting through holes for connection with the insulating substrate are formed in two ends of the welding piece, and a substrate installation through hole for installation of the insulating substrate and one or more capacitor installation counter bores for installation of the capacitor are formed in the insulating substrate.

As preferred, in order to realize the high stability installation of inductance, inductance installation device includes the different and insulating round platform body of inductance mounting panel, cylinder and both ends diameter, the first end of cylinder with the inductance mounting panel is connected, the second end of cylinder is equipped with axial screw, the main aspects of round platform body are equipped with the bigger end cap of diameter, the main aspects external diameter of round platform body is not less than the central through-hole of inductance, the tip external diameter of round platform body is less than the central through-hole of inductance, the tip of round platform body passes the central through-hole of inductance, the round platform body is equipped with axial round platform through-hole and its aperture slightly is greater than the external diameter of cylinder, the second end of cylinder passes behind the round platform through-hole with screw connection.

Specifically, the inductance mounting plate is a cavity bottom plate of the corresponding independent inner cavity and is integrally formed with the cylinder; or the inductance mounting plate is an independent plate installed in the shell and connected with the first end of the cylinder through a screw.

Preferably, in order to avoid the problem that the filter circuit is damaged by reverse voltage breakdown due to the fact that the positive electrode and the negative electrode of the power supply are reversely connected, the filter circuit comprises a current filter circuit and a reverse connection prevention circuit, the reverse connection prevention circuit comprises a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a voltage stabilizing diode and a switch diode, the drain electrode of the first field effect transistor and the drain electrode of the second field effect transistor are connected with each other and serve as the negative electrode of the input power supply of the reverse connection prevention circuit, the grid electrode of the first field effect transistor, the grid electrode of the second field effect transistor, the first end of the third resistor, the first end of the fourth resistor, the negative electrode of the voltage stabilizing diode, the grid electrode of the third field effect transistor, the drain electrode of the third field effect transistor, The grid electrode of the fourth field effect transistor and the drain electrode of the fourth field effect transistor are connected with each other and simultaneously used as the negative electrode of the output power supply of the reverse-connection preventing circuit and the negative electrode of the input power supply of the current filtering circuit, the source electrode of the first field effect transistor is connected with the first end of the first resistor, the source electrode of the second field effect transistor is connected with the first end of the second resistor, the second end of the first resistor, the second end of the second resistor, the second end of the third resistor, the positive electrode of the voltage stabilizing diode, the first end of the fifth resistor and the first end of the sixth resistor are connected with each other, the source electrode of the third field effect transistor is connected with the second end of the sixth resistor, the source electrode of the fourth field effect transistor is connected with the second end of the fifth resistor, and the second end of the fourth resistor is connected with the negative electrode of the switch diode, and the anode of the switch diode is simultaneously used as the anode of the input power supply of the reverse connection preventing circuit, the anode of the output power supply of the reverse connection preventing circuit and the anode of the input power supply of the current filter circuit. The current filter circuit here is the circuit that is used for realizing the current filtering function, can be traditional conventional filter circuit or its improvement filter circuit, with the utility model discloses an it is irrelevant to the innovation, the utility model discloses a key point is that the preceding increase of current filter circuit prevents reverse connection circuit to solve the negative problem that the positive negative pole of power reversed connection brought.

The beneficial effects of the utility model reside in that:

the utility model discloses through set up a plurality of independent inner chambers in the shell and classify or install electronic component in independent inner chamber independently, can realize good electromagnetic shield effect and good electromagnetic compatibility between each electronic component, can realize the independent maintenance of some electronic components again, only need to correspond when some electronic components damage and change, do not need the whole change, practiced thrift use cost; the heat conducting fins are arranged between the inner wall of the shell and the heating device in close contact, and the radiating fins are arranged on the shell, so that heat of the heating device is quickly transmitted to the shell through the heat conducting fins and quickly dissipated to the air through the radiating fins, a high-efficiency radiating effect is realized, meanwhile, heat can be transmitted to the shell through the pouring sealant filled in each independent inner cavity to realize heat dissipation, a good radiating effect that the temperature rise does not exceed 30 ℃ under the normal working condition can be realized, and the high-power supply filter is particularly suitable for a high-power supply filter.

Additionally, the utility model discloses still have following advantage:

the utility model discloses an installation insulating substrate in the shell, and install the welding piece on insulating substrate, make and realize good insulating effect between lead wire and the shell, avoid appearing the voltage breakdown short circuit problem, through set up big welding counter bore on the welding piece, the welding is fuller, can realize the high stability welded connection between the major diameter lead wire of heavy current, high voltage, its connecting resistance is little, the partial pressure is little, voltage loss is little, be favorable to improving power filter's wholeness ability, simultaneously, if the soldering tin melting phenomenon appears under the special circumstances, the molten soldering tin also can be stored in the welding counter bore, can not spread to other places and cause the short circuit problem; by adding the capacitor mounting counter bore, the capacitor can be conveniently mounted on the insulating substrate, and the product integration level and stability are improved.

The utility model discloses a set up dedicated inductance installation device, it is spacing to the one end of inductance to utilize the big end of the round platform body, it is spacing to carry out circumference to the central through-hole pore wall of inductance to utilize the tapering outer wall of the round platform body, it is spacing to utilize the inductance mounting panel to the other end of inductance, it links together the round platform body and inductance mounting panel to utilize the cylinder, thereby the multi-angle limit function of all directions has been realized to the inductance, can realize the bulky, the high stability fixed mounting of the ring shape inductor of heavy weight, even be in the service environment of vibration, the inductor can not become flexible the damage yet.

The utility model adds the reverse connection preventing circuit in front of the traditional filter circuit, when the situation that the power input positive and negative electrodes are connected reversely occurs due to misoperation, the output voltage of the reverse connection preventing circuit and the input voltage of the current filter circuit are zero, thereby avoiding the problem that the filter circuit is broken down and damaged due to reverse voltage; specifically, in the anti-reverse-connection circuit, four field effect tubes are connected in a back-to-back mode, and a connection mode that every two field effect tubes are connected in parallel is adopted, so that no output voltage exists after the circuit is reversely connected, the problem that the reverse connection prevention function cannot be realized due to the fact that an internal diode of a single field effect tube is conducted when the single field effect tube is adopted can be effectively avoided, meanwhile, the internal resistance of the parallel field effect tubes can be reduced, the heat productivity is reduced, and the quality reliability of the circuit is improved; the output end of each field effect tube is connected with a resistor with a current equalizing function, so that the output current of the field effect tubes is kept uniform; the voltage stabilizing diode is used for keeping the voltage of the field effect transistor stable; the switching diode is used to prevent reverse voltage from entering the fet and causing it to be damaged.

Drawings

Fig. 1 is a perspective exploded view of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions of the present invention before assembly;

fig. 2 is a perspective view of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation of the present invention after assembly and with the cover plate removed;

fig. 3 is one of the three-dimensional views of the housing of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions according to the present invention, in which the heat-conducting fins are not shown;

fig. 4 is a second perspective view of the housing of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation according to the present invention, which is different from the perspective view of fig. 3;

fig. 5 is a third perspective view of the housing of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation according to the present invention, in which the heat-conducting fins are shown, which has the same view angle as that of fig. 3;

fig. 6 is a perspective exploded view of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation of the present invention before assembling the housing, the heating device and the heat dissipation device;

fig. 7 is a perspective view of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation of the present invention after assembling the housing, the heating device and the heat dissipation device;

fig. 8 is one of the perspective views of the insulating substrate of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions according to the present invention;

fig. 9 is a second perspective view of the insulating substrate of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation according to the present invention, which is different from the perspective view of fig. 8;

fig. 10 is a perspective view of a welding part of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions according to the present invention;

fig. 11 is a perspective view of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation of the present invention after assembling the insulating substrate and the welding parts;

fig. 12 is one of perspective views of an inductor and an inductor mounting device of a power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions according to the present invention before assembly, wherein the inductor mounting plate is a cavity bottom plate of a corresponding independent inner cavity;

fig. 13 is a second perspective view of the inductor and the inductor mounting device of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation of the present invention before assembly, wherein the inductor mounting plate is a separate plate mounted in the housing;

fig. 14 is a circuit diagram of the filter circuit of the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions of the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1-7, the power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions of the present invention comprises a housing 1 and a filter circuit (not shown in fig. 1-12) disposed in the housing 1, wherein the filter circuit comprises a heat generating device 31 and a circular inductor 4 connected to each other, the power filter further comprises a heat dissipating device for dissipating heat from the heat generating device 31, a wire welding device 2 for welding a plurality of wires, and an inductor installation device 5 for installing the inductor, a plurality of independent cavities 11 separated from each other by partitions (vertical partition 10 and horizontal partition 18 in the figure) and used for installing different independent devices are disposed in the housing 1, the heat dissipating device comprises a heat conducting strip 30 with high thermal conductivity, the heat conducting strip 30 is disposed between the corresponding heat generating device 32 and the inner wall of the housing 1 and respectively in close contact with the corresponding heat generating device 31 and the inner wall of the housing 1, the outer wall of the housing 1 is provided with a plurality of convex heat dissipation fins 17 in the area corresponding to the heat generating device 31. The heating device 31 includes electronic components such as resistors, which are determined according to actual conditions; the annular inductor 4 is generally a common mode inductor or a differential mode inductor, and is large in size and weight, so that stable installation is difficult to realize in a conventional mode; the lead is used for connecting different electronic elements, and for the lead which needs to transmit large current, the conventional connection mode is difficult to realize stable connection with good anti-vibration effect due to larger diameter; the heat generating device 31 and the heat dissipating apparatus together constitute a heat generating and dissipating unit 3.

Also shown in fig. 1 and 2 is an electrical connector 7 for connection to a load, the electrical connector 7 being mounted at one end of the housing 1, fig. 3, 4, 6 and 7 also showing a connection port 14 provided at one end of the housing 1 for connection to the electrical connector 7, and fig. 6 also showing a metal platen 32 for pressing a heat generating device 31 against the housing 1; these are conventional structures.

As shown in fig. 1-14, the present invention further discloses a plurality of more specific optimized structures, and one or more specific structures can be combined with the above structure to form a more optimized technical solution according to actual needs.

In order to make independent inner chamber 11 realize the all-round isolation effect of length and breadth direction, establish bottom plate 13 of shell 1 for horizontal and shell 1's open-top and install apron 6, the baffle includes vertical baffle 10 and horizontal baffle 18, and the lower extreme of a plurality of vertical baffles 10 and shell 1's bottom plate inner wall connection and integrated into one piece are equipped with a plurality of vertical installation bosss 12 on shell 1's the curb plate inner wall, and the upper portion of a plurality of vertical baffles 10 corresponds each other and is connected through one or more horizontal baffle 18 and forms a plurality of independent inner chambers 11 that highly the same or different. Like this, can realize horizontal and vertical all-round isolation between each independent inner chamber 11 to realize better electromagnetic isolation effect, the setting of transverse partition 18 more is favorable to installing a plurality of electronic component such as inductance 4, thereby realizes better integrated installation effect.

In order to conveniently perform concentrated heat dissipation on the heating device 31, the plurality of independent inner cavities 11 include an independent inner cavity 11 for concentrated installation of the heating device 31, and the area where the heat dissipation fins 17 are located corresponds to the area where the independent inner cavity 11 is located, so that a better heat dissipation effect is achieved.

In order to facilitate the positioning of the heat conducting fins 30 for achieving a better heat conducting effect, raised positioning ribs 15 are respectively arranged on the inner wall of the bottom plate 13 of the housing 1 at positions corresponding to one or more (four in the figure) heat conducting fins 30, the plurality of positioning ribs 15 enclose one or more (four in the figure) heat conducting areas 16 for installing the heat conducting fins 30, and the one or more heat conducting fins 30 are arranged in the corresponding one or more heat conducting areas 16.

In order to improve the heat dissipation effect, the housing 1 is an aluminum alloy housing, and the heat-conducting fins 30 are silica gel fins.

In order to realize stable connection of the large-diameter lead and realize a good insulation effect, the lead welding device 2 comprises an insulating base plate 20 and a welding piece 24, wherein the insulating base plate 20 is provided with a plurality of welding piece mounting holes 22 with the same appearance as the welding piece 24, the welding piece 24 is provided with at least two large welding counter bores 25 which are isolated through isolating rib plates 27 and used for welding the large-diameter lead, and the welding pieces 24 are respectively installed in the welding piece mounting holes 22 through screws. The plurality of solder members 24 are collectively mounted on the insulating base plate 20, so that the collective mounting as a whole is facilitated and the improvement of the insulating property is facilitated.

In order to facilitate connection of the small-diameter leads, mounting of the solder 24 on the insulating substrate 20, and mounting of the capacitor (not shown), at least two small solder counter bores 26 for soldering the small-diameter leads are further provided in the solder 24, connection through holes 28 for connection with the insulating substrate 20 are provided at both ends of the solder 24, and a substrate mounting through hole 23 for mounting the insulating substrate 20 and one or more (two in the figure) capacitor mounting counter bores 21 for mounting the capacitor are provided in the insulating substrate 20.

In order to realize high-stability installation of the inductor 4, the inductor installation device 5 comprises an inductor installation plate (see a cavity bottom plate 55 or an independent plate 56 described below), a cylinder 54 and a truncated cone 52, wherein the diameters of the two ends of the truncated cone 52 are different and are insulated, a first end (the lower end in fig. 12 and 13) of the cylinder 54 is connected with the inductor installation plate, a second end (the upper end in fig. 12 and 13) of the cylinder 54 is provided with an axial screw hole 53, the large end of the truncated cone 52 is provided with an end cap 51 with a larger diameter, the outer diameter of the large end of the truncated cone 52 is not smaller than that of the central through hole of the inductor 4, the outer diameter of the small end of the truncated cone 52 is smaller than that of the inductor 4, the small end of the truncated cone 52 penetrates through the central through hole of the inductor 4, the truncated cone 52 is provided with an axial truncated cone through hole 50, the diameter of the truncated cone 52 is.

Specifically, as shown in fig. 12, the inductance mounting plate is a cavity bottom plate 55 of the corresponding independent inner cavity and is integrally formed with a cylinder 54, the cylinder 54 being visible in fig. 3, 5, 6 and 7; or, as shown in fig. 13, the inductance mounting plate is a separate plate 56 installed in the housing 1 and is connected to the first end of the cylinder 54 after passing through a through hole 57 on the separate plate 56 by a screw, in this structure, the first end of the cylinder 54 is also provided with a screw hole or the screw hole 53 at the second end is a screw hole that is axially through; in this example, the independent plate 56 is more specifically the transverse partition 31 in fig. 6.

As shown in fig. 14, in order to avoid the problem that the filter circuit is damaged by reverse voltage breakdown due to reverse connection of the positive and negative terminals of the power supply, the filter circuit includes a current filter circuit (the current filter circuit here is a conventional filter circuit without reverse connection prevention function), and an anti-reverse connection circuit, where the anti-reverse connection circuit includes a first fet D11, a second fet D12, a third fet D13, a fourth fet D14, a first resistor R11, a second resistor R12, a third resistor R13, a fourth resistor R14, a fifth resistor R15, a sixth resistor R16, a zener diode D21, and a switch diode D31, a drain of the first fet D11 and a drain of the second fet D12 are connected to each other and serve as a negative electrode of the input power supply of the anti-reverse connection circuit, a gate of the first fet D11, a gate of the second fet D12, a first end of the third resistor R13, and a first end of the fourth resistor R14 are connected to each other, The cathode of the voltage-stabilizing diode D21, the gate of the third field-effect tube D13, the drain of the third field-effect tube D13, the gate of the fourth field-effect tube D14 and the drain of the fourth field-effect tube D14 are connected with each other and simultaneously serve as the cathode of the output power supply of the anti-reverse-connection circuit and the cathode of the input power supply of the current filter circuit, the source of the first field-effect tube D11 is connected with the first end of the first resistor R11, the source of the second field-effect tube D12 is connected with the first end of the second resistor R12, the second end of the first resistor R11, the second end of the second resistor R12, the second end of the third resistor R13, the anode of the voltage-stabilizing diode D21, the first end of the fifth resistor R15 and the first end of the sixth resistor R16 are connected with each other, the source of the third field-effect tube D13 is connected with the second end of the sixth resistor R16, the source of the fourth field-effect tube D14 is connected with the second end of the fifth resistor R15, and the cathode of the fourth switch R31, the positive pole of the switch diode D31 is simultaneously used as the positive pole of the input power supply of the reverse connection preventing circuit, the positive pole of the output power supply of the reverse connection preventing circuit and the positive pole of the input power supply of the current filter circuit. The first field-effect tube D11, the second field-effect tube D12, the third field-effect tube D13 and the fourth field-effect tube D14 are connected in a back-to-back mode, and the parallel connection mode of every two field-effect tubes is adopted, so that no output voltage exists after the reverse connection of the circuit is ensured, the problem that the reverse connection prevention effect cannot be achieved due to the fact that an internal diode of a single field-effect tube is conducted can be effectively avoided, meanwhile, the internal resistance of the parallel field-effect tubes can be reduced, the heat productivity is reduced, and the quality reliability of the circuit is improved; the output end of each field effect transistor is connected with resistors with a current equalizing function, namely a first resistor R11, a second resistor R12, a fifth resistor R15 and a sixth resistor R16, so that the output current of the corresponding field effect transistor is kept uniform; the voltage stabilizing diode D21 is used for stabilizing the voltage of the field effect transistor; the switching diode D31 is used to prevent reverse voltage from entering the fet and causing it to fail.

The current filter circuit comprises two parallel branch circuits, wherein the first branch circuit consists of two groups of common-mode inductors, namely a first common-mode inductor L1, a second common-mode inductor L2 and a group of differential-mode inductors, namely a first differential-mode inductor L3, and is mainly used for controlling power supply filtering, and the power of the branch circuit is low; the front end of L1 is provided with three capacitors, namely C21, C31 and C32, the rear end is provided with one capacitor, namely C61, and the rear end of L2 is provided with three capacitors, namely C71, C81 and C82; c21, C61, C71 and L3 form a differential mode filter circuit, mainly filter the differential mode interference signal in the control power; the common-mode filter circuit is formed by C31, C32, C81, C82, L1 and L2, and is mainly used for filtering common-mode interference signals in the control power supply. The second branch circuit consists of a first-stage common-mode inductor L4 and a first-stage differential-mode inductor L5, and is mainly used for power supply filtering, and the power of the circuit is high; three capacitors, namely C41, C51 and C52, are arranged at the front end of the L4, and L5 is arranged at the rear end; the C41 and the L5 form a differential mode filter circuit which is mainly used for filtering differential mode interference signals in the power supply; the C51, the C52 and the L4 form a common mode filter circuit, which mainly filters out common mode interference signals in the power supply.

Filter circuit especially is fit for servo motor control and power supply and uses, both can avoid reverse voltage to cause the damage to follow-up equipment, can make control and power part have good filtering effect again to reach and provide the purpose that control and two way systems of power used simultaneously through a set of mains operated, can reach the purpose of solving through system electromagnetic compatibility, the compatible experiment of power supply concurrently again.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.

Claims

1. The utility model provides a power filter with high-efficient electromagnetism is kept apart and high-efficient heat dissipation function, includes the shell and locates filter circuit in the shell, filter circuit includes interconnect's the device that generates heat and the annular inductance of circle, its characterized in that: the power filter further comprises a heat dissipation device for dissipating heat of the heating device, a lead welding device for welding and connecting a plurality of leads and an inductor installation device for installing an inductor, a plurality of independent inner cavities which are mutually isolated through partition plates and used for installing different independent devices are arranged in the shell, the heat dissipation device comprises heat conducting fins with high heat conductivity coefficients, the heat conducting fins are arranged between the heating device and the inner wall of the shell and respectively in close contact with the heating device and the inner wall of the shell, and a plurality of convex heat dissipation fins are arranged in an area corresponding to the heating device on the outer wall of the shell.

2. The power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions as claimed in claim 1, wherein: establish the bottom plate of shell is horizontal just the open-top of shell installs the apron, the baffle includes vertical baffle and transverse baffle, and is a plurality of the lower extreme of vertical baffle with the bottom plate inner wall connection and the integrated into one piece of shell, be equipped with a plurality of vertical installation bosss on the curb plate inner wall of shell, it is a plurality of the upper portion of vertical baffle is with a plurality of the upper portion of installation boss corresponds each other and through one or more transverse baffle connects and forms a plurality of same or different of height independent inner chamber.

3. The power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions as claimed in claim 2, wherein: the plurality of independent inner cavities comprise an independent inner cavity for intensively mounting the heating device, and the area of the heat dissipation fin corresponds to the area of the independent inner cavity.

4. The power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions as recited in claim 3, wherein: the inner wall of the bottom plate of the shell is provided with one or more raised positioning ribs corresponding to the heat conducting fins respectively, the plurality of positioning ribs surround one or more heat conducting areas for mounting the heat conducting fins, and the one or more heat conducting fins are arranged in the corresponding one or more heat conducting areas.

5. The power filter having high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions as recited in any one of claims 1 to 4, wherein: the shell is an aluminum alloy shell, and the heat conducting fins are silica gel fins.

6. The power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions as claimed in claim 1, wherein: the lead welding device comprises an insulating base plate and a welding piece, wherein a plurality of welding piece mounting holes are formed in the insulating base plate, the shape of the welding piece is consistent with that of the welding piece, at least two large welding counter bores which are isolated through isolation rib plates and used for welding large-diameter leads are formed in the welding piece, and the welding piece is mounted in the welding piece mounting holes respectively.

7. The power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions as recited in claim 6, wherein: the welding piece is further provided with at least two small welding counter bores used for welding small-diameter leads, the two ends of the welding piece are provided with connecting through holes used for being connected with the insulating substrate, and the insulating substrate is provided with a substrate mounting through hole used for mounting the insulating substrate and one or more capacitor mounting counter bores used for mounting capacitors.

8. The power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions as claimed in claim 1, wherein: inductance installation device includes the different and insulating round platform body of inductance mounting panel, cylinder and both ends diameter, the first end of cylinder with the inductance mounting panel is connected, the second end of cylinder is equipped with axial screw, the main aspects of round platform body are equipped with the bigger end cap of diameter, the main aspects external diameter of round platform body is not less than the central through-hole of inductance, the tip external diameter of round platform body is less than the central through-hole of inductance, the tip of round platform body passes the central through-hole of inductance, the round platform body is equipped with axial round platform through-hole and its aperture slightly is greater than the external diameter of cylinder, the second end of cylinder passes behind the round platform through-hole with screw connection.

9. The power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions as recited in claim 8, wherein: the inductance mounting plate is a cavity bottom plate of the corresponding independent inner cavity and is integrally formed with the cylinder; or the inductance mounting plate is an independent plate installed in the shell and connected with the first end of the cylinder through a screw.

10. The power filter with high-efficiency electromagnetic isolation and high-efficiency heat dissipation functions as recited in any one of claims 1 to 4 and 6 to 9, wherein: the filter circuit comprises a current filter circuit and an anti-reverse connection circuit, the anti-reverse connection circuit comprises a first field effect tube, a second field effect tube, a third field effect tube, a fourth field effect tube, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a voltage stabilizing diode and a switch diode, a drain electrode of the first field effect tube and a drain electrode of the second field effect tube are connected with each other and serve as a negative electrode of an input power supply of the anti-reverse connection circuit, a grid electrode of the first field effect tube, a grid electrode of the second field effect tube, a first end of the third resistor, a first end of the fourth resistor, a negative electrode of the voltage stabilizing diode, a grid electrode of the third field effect tube, a drain electrode of the third field effect tube, a grid electrode of the fourth field effect tube and a drain electrode of the fourth field effect tube are connected with each other and serve as a negative electrode of an output power supply of the anti-reverse connection circuit and a negative electrode of the input power supply of the current A source electrode of the first field effect transistor is connected with a first end of the first resistor, a source electrode of the second field effect transistor is connected with a first end of the second resistor, a second end of the first resistor, a second end of the second resistor, a second end of the third resistor, an anode of the zener diode, a first end of the fifth resistor, and a first end of the sixth resistor are connected to each other, the source electrode of the third field effect transistor is connected with the second end of the sixth resistor, the source electrode of the fourth field effect transistor is connected with the second end of the fifth resistor, the second end of the fourth resistor is connected with the negative electrode of the switch diode, and the positive electrode of the switch diode is simultaneously used as the positive electrode of the input power supply of the reverse-connection preventing circuit, the positive electrode of the output power supply of the reverse-connection preventing circuit and the positive electrode of the input power supply of the current filter circuit.