CN211352043U

CN211352043U - Filtering power supply system for EMC

Info

Publication number: CN211352043U
Application number: CN202020094964.8U
Authority: CN
Inventors: 李瑾; 段晓波; 唐小辉
Original assignee: Chengdu Hongming Electronics Co Ltd
Current assignee: Chengdu Hongming Electronics Co Ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-08-25
Anticipated expiration: 2030-01-16

Abstract

The utility model discloses a filtering power supply system for EMC, including the machine case, the machine case inner chamber is separated into wave filter installation cavity A, wave filter installation cavity B and power module installation cavity through T type shielding baffle, and the direct current wave filter is correspondingly installed in the wave filter installation cavity A of machine case, and the alternating current wave filter is correspondingly installed in the wave filter installation cavity B of machine case, and the power input end of machine case is installed with connector A and connector B; the power module installation cavity of the case is correspondingly provided with a power module, the power module comprises a DC/DC power module and an AC/DC power module, and the power output end of the case is provided with a connector C electrically connected with the power module. The utility model discloses on outside direct current or alternating current power supply inputed different wave filters through the connector that corresponds, through the interference of the respective punching electric capacity filtering high frequency signal that corresponds again behind wave filter filtering electromagnetic interference, at last through the direct current or the alternating current of power module through connector output required voltage, electric current after inside the conversion.

Description

Filtering power supply system for EMC

Technical Field

The utility model relates to a EMC power filtering technology field especially relates to a filtering power supply system for EMC.

Background

Along with the demand of the public on the information transmission speed, the frequency of a transmitted signal is higher and higher, an input power supply in various electronic equipment easily generates electromagnetic noise and clutter to interfere the power supply, the power supply is damaged, the power supply output after the power supply is converted contains the noise and the clutter, and the output power supply and the high-frequency clutter generated by the output power supply can also interfere the power grid. Adding filters to various electronic devices is an effective way to solve the above problems, and the filtering of power sources is particularly important; if the filter is isolated from the outside and has poor shielding performance, the input power supply can generate electromagnetic noise and clutter, and meanwhile, the external electromagnetism can also interfere the internal filter.

With the gradual improvement of the technical level, the requirements on miniaturization and integration of various devices are higher and higher. At present, after module design of most domestic power supply equipment is completed, various filters are added at the front end of a system DC/DC module or an AC/DC module to ensure that an electromagnetic compatibility test of the equipment can pass smoothly. The whole set of power supply equipment needs to complete 21 tests related to electric field radiation emission and electromagnetic compatibility, in order to complete the electromagnetic compatibility test, a filter needs to be added, and meanwhile, the whole structure needs to be adjusted, wherein a CE102 power line conducts emission and mainly plays a role of the filter, but the CE102 is often difficult to pass the RE102 electric field radiation emission test after being completed, and the equipment needs to be designed in an integral planning mode, so that the influence of radiation emission on a test result is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the weak point that prior art exists, the utility model is to provide a filtering power supply system for EMC, on externally direct current or alternating current power supply input different wave filters through the connector that corresponds, through the interference of the through electric capacity filtering high frequency signal that corresponds separately again behind wave filter filtering electromagnetic interference, at last through the direct current or the alternating current of power module through connector output required voltage, electric current after inside conversion.

The purpose of the utility model is realized through the following technical scheme:

a filtering power supply system for EMC comprises a chassis, wherein an inner cavity of the chassis is divided into a filter installation cavity A, a filter installation cavity B and a power supply module installation cavity by a T-shaped shielding partition plate, one side of the chassis is provided with a power supply input end, the other side of the chassis is provided with a power supply output end, the filter installation cavity A and the filter installation cavity B are close to the power supply input end of the chassis, and the power supply module installation cavity is close to the power supply output end of the chassis; a direct current filter is correspondingly installed in the filter installation cavity A of the case, an alternating current filter is correspondingly installed in the filter installation cavity B of the case, a connector A electrically connected with the input end of the direct current filter is installed at the power input end of the case, and a connector B electrically connected with the input end of the alternating current filter is installed at the power input end of the case; the power module comprises a DC/DC power module and an AC/DC power module, a connector C electrically connected with the power module is mounted at the power output end of the case, the output end of the DC filter is electrically connected with the DC/DC power module through two feedthrough capacitors A, the DC/DC power module is used for converting the direct current filtered by the DC filter into the direct current with required voltage and current for output (the DC/DC power module is electrically connected with the connector C, the DC/DC power module converts the direct current filtered by the DC filter into the direct current with required voltage and current for output through the connector C), the output end of the AC filter is electrically connected with the AC/DC power module through three feedthrough capacitors B, and the AC/DC power module is used for converting the alternating current filtered by the AC filter into the direct current with required voltage and current And (3) outputting the alternating current (the AC/DC power supply module is electrically connected with the connector C, and the AC/DC power supply module converts the direct current filtered by the direct current filter into the alternating current with required voltage and current and outputs the alternating current through the connector C).

In order to realize better the utility model discloses, machine case outside is equipped with waterproof rubber, the inside shielding layer or the shielding strip that corresponds respectively of wave filter installation cavity A, wave filter installation cavity B and the power module installation cavity of machine case.

The further technical scheme is as follows: the alternating current filter comprises an alternating current filter shell, an alternating current circuit installation cavity is arranged in the alternating current filter shell, three input electrodes B which are correspondingly and electrically connected with a connector B are installed at the input end of the alternating current filter shell, three output electrodes B are installed at the output end of the alternating current filter shell and are electrically connected with three feedthrough capacitors B in a one-to-one correspondence manner, the input electrodes B and the output electrodes B are identical in structure, an alternating current power supply filter circuit is installed in the alternating current circuit installation cavity of the alternating current filter shell, the input end of the alternating current power supply filter circuit is electrically connected with the input electrodes B, and the output end of the alternating current power supply filter circuit is electrically connected with the output electrodes B; the input end of the alternating current power supply filter circuit is sequentially provided with a first common-mode capacitor assembly, a first differential-mode capacitor assembly and a common-mode inductor assembly L1, and the output end of the alternating current power supply filter circuit is sequentially provided with a second differential-mode capacitor assembly, a second common-mode capacitor assembly, a differential-mode inductor assembly and a third differential-mode capacitor assembly; the direct current filter comprises a direct current filter shell, a direct current line installation cavity is arranged in the direct current filter shell, two input electrodes A which are correspondingly and electrically connected with a connector A are installed at the input end of the direct current filter shell, two output electrodes A are installed at the output end of the direct current filter shell, the two output electrodes A are electrically connected with two through capacitors A in a one-to-one correspondence mode, the input electrodes A and the output electrodes A are identical in structure, a direct current power supply filter line is installed in the direct current line installation cavity of the direct current filter shell, the input end of the direct current power supply filter line is electrically connected with the input electrodes A, and the output end of the direct current power supply filter line is electrically connected with the output electrodes A; the direct-current power supply filtering circuit is sequentially connected with a common-mode inductor L5 and a common-mode inductor L6 from an input end to an output end, the input end of the direct-current power supply filtering circuit is electrically connected with a common-mode capacitor Cy3, the output end of the direct-current power supply filtering circuit is electrically connected with a common-mode capacitor Cy4, the input end of the direct-current power supply filtering circuit is connected with a resistor R, and the direct-current power supply filtering circuit is further electrically connected with a differential-mode capacitor Cx 4.

The utility model discloses AC power supply filter circuit's concrete technical scheme as follows: the alternating-current power supply filter line comprises an A-phase power transmission line, a B-phase power transmission line and a C-phase power transmission line, the first common-mode capacitor assembly comprises three common-mode capacitors Cy1, and the three common-mode capacitors Cy1 are respectively connected with the A-phase power transmission line, the B-phase power transmission line and the C-phase power transmission line in a one-to-one correspondence manner; the first differential mode capacitance component comprises three differential mode capacitances Cx1, wherein the first differential mode capacitance Cx1 is connected between the A-phase power line and the B-phase power line, the second differential mode capacitance Cx1 is connected between the B-phase power line and the C-phase power line, and the third differential mode capacitance Cx1 is connected between the A-phase power line and the C-phase power line; the common-mode inductor assembly L1 comprises three common-mode inductors and soft magnetic ferrite magnetic cores, and the three common-mode inductors are respectively connected to the A-phase power transmission line, the B-phase power transmission line and the C-phase power transmission line in a one-to-one correspondence manner; the second differential mode capacitor assembly comprises three differential mode capacitors Cx2, wherein the first differential mode capacitor Cx2 is connected between the A-phase power line and the B-phase power line, the second differential mode capacitor Cx2 is connected between the B-phase power line and the C-phase power line, and the third differential mode capacitor Cx2 is connected between the A-phase power line and the C-phase power line; the second common-mode capacitor assembly comprises three common-mode capacitors Cy2, and the three common-mode capacitors Cy2 are respectively connected with the phase-A power transmission line, the phase-B power transmission line and the phase-C power transmission line in a one-to-one correspondence manner; the differential mode inductance assembly comprises three differential mode inductances, the three differential mode inductances are a first differential mode inductance L2, a second differential mode inductance L3 and a third differential mode inductance L4 respectively, the first differential mode inductance L2 is correspondingly connected to an A-phase power transmission line, the second differential mode inductance L3 is correspondingly connected to a B-phase power transmission line, and the third differential mode inductance L4 is correspondingly connected to a C-phase power transmission line; the third differential mode capacitor assembly comprises three differential mode capacitors Cx3, wherein the first differential mode capacitor Cx3 is connected between the A-phase power line and the B-phase power line, the second differential mode capacitor Cx3 is connected between the B-phase power line and the C-phase power line, and the third differential mode capacitor Cx3 is connected between the A-phase power line and the C-phase power line.

The utility model discloses DC power supply filter circuit's concrete technical scheme as follows: the direct-current power supply filter line comprises a positive input line and a negative input line, and the resistor R is electrically connected between the positive input line and the negative input line of the input end of the direct-current power supply filter line; the common-mode inductor L5 comprises a first inductor coil A, a second inductor coil A and an annular magnetic core A, the first inductor coil A and the second inductor coil A are wound on the annular magnetic core A, the common-mode inductor L6 comprises a first inductor coil B, a second inductor coil B and an annular magnetic core B, the first inductor coil B and the second inductor coil B are wound on the annular magnetic core B, the first inductor coil A and the first inductor coil B are connected to a positive input line, and the first inductor coil B and the second inductor coil B are connected to a negative input line; the number of the common-mode capacitors Cy3 is two, the first common-mode capacitor Cy3 is connected to the positive input line of the input end of the direct-current power supply filter line, and the second common-mode capacitor Cy3 is connected to the negative input line of the input end of the direct-current power supply filter line; the number of the common-mode capacitors Cy4 is two, the first common-mode capacitor Cy4 is connected to the positive input line of the output end of the direct-current power supply filter line, and the second common-mode capacitor Cy4 is connected to the negative input line of the output end of the direct-current power supply filter line; the number of the differential mode capacitors Cx4 is three, the first differential mode capacitor Cx4 is connected between a positive input line and a negative input line of the input end of the direct-current power supply filter circuit, the second differential mode capacitor Cx4 is electrically connected between the positive input line and the negative input line of the direct-current power supply filter circuit between the common mode inductor L5 and the common mode inductor L6, and the third differential mode capacitor Cx4 is connected between the positive input line and the negative input line of the output end of the direct-current power supply filter circuit.

The utility model discloses input electrode A is identical with input electrode B structure, promptly input electrode A, output electrode A, input electrode B, output electrode B structure all are identical. The specific structure of the electrode is described in detail below by taking the input electrode a as an example: the input electrode A comprises a screw rod electrode, the screw rod electrode sequentially comprises an external thread column, a square rod part and an internal thread column from left to right, a contact boss is fixed on the outer part of the screw rod electrode between the external thread column and the square rod part, a nut A is installed on the external thread column in a threaded mode, an elastic pad A and a flat pad A are sequentially sleeved on the external thread column from left to right, and the elastic pad A and the flat pad A are both located between the nut A and the contact boss; an insulator A and an insulator B are sequentially arranged on the square rod part from left to right, a nut B is arranged on the internal thread column in a threaded mode, a flat pad B and an elastic pad B are sequentially arranged on the internal thread column from left to right, and the flat pad B and the elastic pad B are both located between the nut B and the insulator B; the internal thread post is provided with a wiring hole, and the side part of the internal thread post is provided with an air hole communicated with the wiring hole.

Preferably, an external thread A is arranged outside the internal thread column, an external thread B is arranged outside the external thread column, and the pitch of the external thread A of the internal thread column is greater than that of the external thread B of the external thread column; the cross section of the square rod part of the screw electrode is square, a square hole A matched with the square rod part is formed in the insulator A in a penetrating mode, and a square hole B matched with the square rod part is formed in the insulator B in a penetrating mode.

Preferably, the insulator A and the insulator B are both made of an insulating material which can withstand a temperature of-55 ℃ to +125 ℃.

Preferably, a heat-conducting potting adhesive is filled in the alternating current line mounting cavity of the alternating current filter shell.

Preferably, a heat-conducting pouring sealant is encapsulated in a direct-current line installation cavity of the direct-current filter shell; the annular magnetic core A of the common mode inductor L5 is an amorphous magnetic core, the annular magnetic core B of the common mode inductor L6 is a high-flux magnetic core, the withstand voltages of the differential mode capacitor Cx4 and the differential mode capacitor Cx5 are both larger than 100VDC, and the withstand voltage of the common mode capacitor Cy4 is larger than 250 VDC.

Compared with the prior art, the utility model, have following advantage and beneficial effect:

(1) the utility model discloses on outside direct current or alternating current power supply inputed different wave filters through the connector that corresponds, through the interference of the respective punching electric capacity filtering high frequency signal that corresponds again behind wave filter filtering electromagnetic interference, at last through the direct current or the alternating current of power module through connector output required voltage, electric current after inside the conversion.

(2) The utility model discloses machine incasement portion contains the installation isolation chamber that three mutual independence and shielding performance are good, can effectively eliminate the adverse effect of high frequency coupling to the EMC test, and machine case outside is equipped with waterproof rubber, can prevent that steam from getting into, and the installation is kept apart and is equipped with shielding layer or shielding strip on the chamber isolation muscle all around, can keep apart the outside interference type signal that gets into through the gap.

(3) The utility model has a round hole formed by special processing in the isolation rib, and a feedthrough capacitor is arranged through the round hole, which plays the role of filtering high-frequency signal interference and simultaneously also has the function of electrical connection; the filter assembly comprises a direct current filter and an alternating current filter, the filter assembly is correspondingly arranged in the corresponding installation isolation cavity, three connector installation positions are arranged in the outer surface of the case, a conductive gasket is arranged between the connector and the installation surface of the case, interference type signals entering the case through a gap can be isolated, and the roughness of the installation surface of the connector of the case is required to be less than or equal to 1.6.

(4) The AC filter of the utility model can realize high insertion loss in the range of 0.01MHz to 10MHz, and can fully restrain the electromagnetic interference of the AC power supply filter circuit; after the alternating current power supply filter circuit is completed, heat-conducting pouring sealant is injected into the shell, so that the air gap vibration of the inductor is reduced, and the electrical characteristics are stabilized.

(5) The utility model discloses direct current filter circuit wholly constitutes two pi type circuits, has advantages such as simple structure, use simple to operate, can play the guard action to the power, mainly suppresses input power's electromagnetic noise and clutter, prevents to power supply interference, also prevents that the high frequency clutter that power itself produced from disturbing the electric wire netting simultaneously.

(6) The utility model discloses electrode (including input electrode A, output electrode A, input electrode B, output electrode B) can with the supporting installation of wave filter, can play fine insulation, shielding effect after the installation, the screw rod electrode closely matches at the supporting mounting hole of wave filter simultaneously, can not take place to rotate, insulator A, insulator B also can not take place to rotate on the screw rod electrode, the screw rod electrode can closely match and install on the wave filter, play stable power source and insert and shielding effect.

(7) The utility model discloses the internal thread post of electrode is opened there is the wiring hole, and internal thread post lateral part is opened there is the bleeder vent, inserts the wiring hole of internal thread post when the internal conductor, at the downthehole tin that adds in wiring hole, can follow the bleeder vent after the tin melts and flow out, and the tin that melts like this can fill the wiring hole completely and play and stabilize the internal conductor connection effect, and the tin flows in the nut screw through the bleeder vent and solidifies simultaneously, and the nut will not dismantle like this, can reduce the later maintenance difficulty.

Drawings

Fig. 1 is a schematic diagram of the internal structure of the filtering power supply system of the present invention;

fig. 2 is a schematic structural view of the inside of the case of the present invention;

FIG. 3 is a schematic structural view of the present invention divided by T-shaped shielding partitions;

fig. 4 is a circuit diagram of the ac power filter circuit of the present invention;

fig. 5 is a schematic diagram of an external structure of the ac filter according to the present invention;

fig. 6 is an internal cross-sectional view of the ac filter of the present invention;

fig. 7 is an internal cross-sectional view of the ac filter of the present invention when assembled;

fig. 8 is a circuit diagram of the dc power filter circuit of the present invention;

fig. 9 is a schematic diagram of an external structure of the dc filter according to the present invention;

fig. 10 is an internal cross-sectional view of the dc filter of the present invention;

fig. 11 is an internal cross-sectional view of the dc filter of the present invention when assembled;

fig. 12 is a schematic structural diagram of an input electrode or an output electrode according to the present invention;

FIG. 13 is a schematic structural view of the screw electrode of FIG. 12;

fig. 14 is a cross-sectional view of fig. 13.

Wherein, the names corresponding to the reference numbers in the drawings are:

1-chassis, 2-connector a, 21-connector mounting groove a, 3-connector B, 31-connector mounting groove B, 4-direct current filter, 41-filter mounting cavity a, 42-direct current filter housing, 421-direct current line mounting cavity, 43-input electrode a, 44-output electrode a, 5-alternating current filter, 51-filter mounting cavity B, 52-alternating current filter housing, 521-alternating current line mounting cavity, 53-input electrode B, 54-output electrode B, 6-feedthrough capacitor a, 7-feedthrough capacitor B, 8-power module, 81-DC/DC power module, 82-AC/DC power module, 83-power module mounting cavity, 9-connector C, 91-connector mounting hole, 10-screw electrode, 11-external screw post, 12-contact boss, 13-square rod portion, 14-internal screw post, 141-wiring hole, 142-air hole, 15-insulator A, 16-insulator B, 17-flat pad A, 18-elastic pad A, 19-nut A, 20-flat pad B, 22-elastic pad B and 23-nut B.

Detailed Description

The present invention will be described in further detail with reference to the following examples:

examples

As shown in fig. 1 to 14, a filter power supply system for EMC includes a chassis 1, an inner cavity of the chassis 1 is divided into a filter installation cavity a41, a filter installation cavity B51 and a power module installation cavity 83 by a T-shaped shielding partition, one side of the chassis 1 is a power input end, the other side of the chassis 1 is a power output end, the filter installation cavity a41 and the filter installation cavity B51 are close to the power input end of the chassis 1, and the power module installation cavity 83 is close to the power output end of the chassis 1. The filter installation cavity A41 of machine case 1 is correspondingly provided with a direct current filter 4, the filter installation cavity B51 of machine case 1 is correspondingly provided with an alternating current filter 5, the power input end of machine case 1 is provided with a connector A2 electrically connected with the input end of the direct current filter 4, the power input end of machine case 1 is provided with a connector installation groove A21, the connector installation groove A21 is square, the connector A2 is provided with a square block A, the connector A2 penetrates through the machine case 1, and meanwhile, the square block A of the connector A2 is matched and assembled with the connector installation groove A21. The power input end of the case 1 is provided with a connector B3 electrically connected with the input end of the alternating current filter 5, the power input end of the case 1 is provided with a connector mounting groove B31, the connector mounting groove B31 is square, the connector B3 is provided with a square block B, the connector B3 penetrates through the case 1, and meanwhile, the square block B of the connector B3 is matched and assembled with a connector mounting groove B31.

As shown in fig. 1, a power module 8 is correspondingly installed in the power module installation cavity 83 of the chassis 1, the power module 8 includes a DC/DC power module 81 and an AC/DC power module 82, a connector C9 electrically connected to the power module 8 is installed at a power output end of the chassis 1, a connector installation hole 91 is opened at the power output end of the chassis 1, and the connector C9 is matched to penetrate through the connector installation hole 91 of the chassis 1 and is matched to be assembled and fixed. The output end of the direct current filter 4 is electrically connected with a DC/DC power supply module 81 through two feedthrough capacitors A6, the DC/DC power supply module 81 is used for converting direct current filtered by the direct current filter 4 into direct current with required voltage and current, the direct current output DC/DC power supply module 81 is electrically connected with a connector C9, the DC/DC power supply module 81 is used for converting direct current filtered by the direct current filter 4 into direct current with required voltage and current and outputting the direct current through a connector C9, the output end of the alternating current filter 5 is electrically connected with an AC/DC power supply module 82 through three feedthrough capacitors B7, the AC/DC power supply module 82 is used for converting alternating current filtered by the alternating current filter 5 into alternating current with required voltage and current, the AC/DC power supply module 82 is electrically connected with a connector C9, and the AC/DC power supply module 82 is used for converting direct current filtered by the direct current filter 4 into alternating current with required voltage and current and.

The utility model discloses preferred machine case 1 outside is equipped with waterproof rubber, and the inside correspondence respectively of wave filter installation cavity A41, wave filter installation cavity B51 and the power module installation cavity 83 of machine case 1 is equipped with shielding layer or shielding strip.

As shown in fig. 4 to 7, the ac filter 5 includes an ac filter case 52, an ac line mounting cavity 521 is provided in the ac filter case 52, three input electrodes B53 electrically connected to the connector B3 are mounted on the input side of the ac filter case 52, three output electrodes B54 are mounted on the output side of the ac filter case 52, three output electrodes B54 are electrically connected to three feedthrough capacitors B7 in a one-to-one correspondence, the input electrode B53 and the output electrode B54 have the same structure, an ac power filter line is mounted in the ac line mounting cavity 521 of the ac filter case 52, the input side of the ac power filter line is electrically connected to the input electrode B53, and the output side of the ac power filter line is electrically connected to the output electrode B54. The input end of the alternating current power supply filter circuit is sequentially provided with a first common-mode capacitor assembly, a first differential-mode capacitor assembly and a common-mode inductor assembly L1, and the output end of the alternating current power supply filter circuit is sequentially provided with a second differential-mode capacitor assembly, a second common-mode capacitor assembly, a differential-mode inductor assembly and a third differential-mode capacitor assembly.

As shown in fig. 4, the ac power filter line includes an a-phase power line, a B-phase power line, and a C-phase power line, the first common-mode capacitor assembly includes three common-mode capacitors Cy1, and the three common-mode capacitors Cy1 are respectively connected to the a-phase power line, the B-phase power line, and the C-phase power line in a one-to-one correspondence. The first differential mode capacitance component comprises three differential mode capacitances Cx1, a first differential mode capacitance Cx1 is connected between the A-phase power line and the B-phase power line, a second differential mode capacitance Cx1 is connected between the B-phase power line and the C-phase power line, and a third differential mode capacitance Cx1 is connected between the A-phase power line and the C-phase power line. The common mode inductance assembly L1 includes three common mode inductances and soft magnetic ferrite cores, and the three common mode inductances are respectively connected to the A-phase power transmission line, the B-phase power transmission line and the C-phase power transmission line in a one-to-one correspondence manner. The second differential mode capacitance assembly comprises three differential mode capacitances Cx2, a first differential mode capacitance Cx2 is connected between the A phase power line and the B phase power line, a second differential mode capacitance Cx2 is connected between the B phase power line and the C phase power line, and a third differential mode capacitance Cx2 is connected between the A phase power line and the C phase power line. The second common-mode capacitance assembly comprises three common-mode capacitances Cy2, and the three common-mode capacitances Cy2 are respectively connected with the phase-A power lines, the phase-B power lines and the phase-C power lines in a one-to-one correspondence mode. The differential mode inductance assembly comprises three differential mode inductances, the three differential mode inductances are a first differential mode inductance L2, a second differential mode inductance L3 and a third differential mode inductance L4 respectively, the first differential mode inductance L2 is correspondingly connected to the phase A power transmission line, the second differential mode inductance L3 is correspondingly connected to the phase B power transmission line, and the third differential mode inductance L4 is correspondingly connected to the phase C power transmission line. The third differential mode capacitance component comprises three differential mode capacitances Cx3, a first differential mode capacitance Cx3 is connected between the A-phase power line and the B-phase power line, a second differential mode capacitance Cx3 is connected between the B-phase power line and the C-phase power line, and a third differential mode capacitance Cx3 is connected between the A-phase power line and the C-phase power line. The utility model discloses an embedment has the heat conduction casting glue in AC filter casing 52's AC line installation cavity 521, and the heat conduction casting glue can reduce the vibrations of inductance air gap and stabilize the electrical characteristic.

As shown in fig. 9 to 11, the dc filter 4 includes a dc filter housing 42, a dc line mounting cavity 421 is provided in the dc filter housing 42, two input electrodes a43 electrically connected to the connector a2 are mounted at an input end of the dc filter housing 42, two output electrodes a44 are mounted at an output end of the dc filter housing 42, the two output electrodes a44 are electrically connected to two feedthrough capacitors a6 in a one-to-one correspondence, the input electrode a43 and the output electrode a44 have the same structure, a dc power filter line is mounted in the dc line mounting cavity 421 of the dc filter housing 42, an input end of the dc power filter line is electrically connected to the input electrode a43, and an output end of the dc power filter line is electrically connected to the output electrode a 44. The direct-current power supply filter circuit is sequentially connected with a common-mode inductor L5 and a common-mode inductor L6 from the input end to the output end, the input end of the direct-current power supply filter circuit is electrically connected with a common-mode capacitor Cy3, the output end of the direct-current power supply filter circuit is electrically connected with a common-mode capacitor Cy4, the input end of the direct-current power supply filter circuit is connected with a resistor R, and the direct-current power supply filter circuit is further electrically connected with a differential-mode capacitor.

As shown in fig. 9, the dc power filter line includes a positive input line and a negative input line, and the resistor R is electrically connected between the positive input line and the negative input line of the input terminal of the dc power filter line. Common mode inductance L5 includes first inductance coils A, second inductance coils A and annular magnetic core A, first inductance coils A, second inductance coils A winds on annular magnetic core A, common mode inductance L6 includes first inductance coils B, second inductance coils B and annular magnetic core B, first inductance coils B, second inductance coils B winds on annular magnetic core B, first inductance coils A, first inductance coils B is connected on the positive pole input line, first inductance coils B, second inductance coils B is connected in the negative pole input line. The number of the common-mode capacitors Cy3 is two, the first common-mode capacitor Cy3 is connected to the positive input line of the input end of the direct-current power supply filter line, and the second common-mode capacitor Cy3 is connected to the negative input line of the input end of the direct-current power supply filter line. The number of the common-mode capacitors Cy4 is two, the first common-mode capacitor Cy4 is connected to the positive input line of the output end of the direct-current power supply filter line, and the second common-mode capacitor Cy4 is connected to the negative input line of the output end of the direct-current power supply filter line. The number of the differential mode capacitors Cx4 is three, the first differential mode capacitor Cx4 is connected between the positive input line and the negative input line of the input end of the direct-current power supply filter circuit, the second differential mode capacitor Cx4 is electrically connected between the positive input line and the negative input line of the direct-current power supply filter circuit between the common mode inductor L5 and the common mode inductor L6, and the third differential mode capacitor Cx4 is connected between the positive input line and the negative input line of the output end of the direct-current power supply filter circuit. The utility model discloses the embedment has the heat conduction casting glue in direct current circuit installation cavity 421 of direct current filter casing 42, and the heat conduction casting glue can reduce the vibrations of inductance air gap and stabilize the electrical characteristic. The annular magnetic core A of the common mode inductor L5 is an amorphous magnetic core, the annular magnetic core B of the common mode inductor L6 is a high-flux magnetic core, the withstand voltages of the differential mode capacitor Cx4 and the differential mode capacitor Cx5 are both larger than 100VDC, and the withstand voltage of the common mode capacitor Cy4 is larger than 250 VDC.

As shown in fig. 12 to 14, the input electrode a43 and the input electrode B53 have the same structure, that is, the input electrode a43, the output electrode a44, the input electrode B53 and the output electrode B54 have the same structure. Input electrode A43 includes screw rod electrode 10, screw rod electrode 10 includes external screw thread post 11 from a left side to the right side in proper order, square pole portion 13 and internal screw thread post 14, screw rod electrode 10 is located external fixation between external screw thread post 11 and square pole portion 13 and has contacted boss 12, nut A19 is installed to the screw thread on the external screw thread post 11, on the external screw thread post 11 from a left side to the right side in proper order the cover be equipped with bullet pad A18 and flat pad A17, bullet pad A18, flat pad A17 all are located between nut A19 and the contact boss 12. An insulator A15 and an insulator B16 are sequentially mounted on the square rod part 13 from left to right, a nut B23 is mounted on the internal thread column 14 in a threaded mode, a flat pad B20 and an elastic pad B22 are sequentially mounted on the internal thread column 14 from left to right, and the flat pad B20 and the elastic pad B22 are located between the nut B23 and the insulator B16. The internal thread column 14 is provided with a wiring hole 141, and the side part of the internal thread column 14 is provided with a ventilation hole 142 communicated with the wiring hole 141.

As shown in fig. 12 to 14, the external portion of the internally threaded post 14 is provided with an external thread a, the external portion of the externally threaded post 11 is provided with an external thread B, and the pitch of the external thread a of the internally threaded post 14 is greater than the pitch of the external thread B of the externally threaded post 11. The cross section of the square rod part 13 of the screw electrode 10 is square, a square hole A matched with the square rod part 13 is formed in the insulator A15 in a penetrating mode, and a square hole B matched with the square rod part 13 is formed in the insulator B16 in a penetrating mode. The insulator A15 and the insulator B16 are made of insulating materials which can resist the temperature of minus 55 ℃ to plus 125 ℃.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A filter power supply system for EMC, characterized by: the novel power supply cabinet comprises a cabinet (1), wherein an inner cavity of the cabinet (1) is divided into a filter installation cavity A (41), a filter installation cavity B (51) and a power module installation cavity (83) through a T-shaped shielding partition plate, one side of the cabinet (1) is provided with a power input end, the other side of the cabinet (1) is provided with a power output end, the filter installation cavity A (41) and the filter installation cavity B (51) are close to the power input end of the cabinet (1), and the power module installation cavity (83) is close to the power output end of the cabinet (1); a direct current filter (4) is correspondingly installed in a filter installation cavity A (41) of the case (1), an alternating current filter (5) is correspondingly installed in a filter installation cavity B (51) of the case (1), a connector A (2) electrically connected with the input end of the direct current filter (4) is installed at the power input end of the case (1), and a connector B (3) electrically connected with the input end of the alternating current filter (5) is installed at the power input end of the case (1); the power module installing structure is characterized in that a power module (8) is correspondingly installed in a power module installing cavity (83) of the case (1), the power module (8) comprises a DC/DC power module (81) and an AC/DC power module (82), a connector C (9) electrically connected with the power module (8) is installed at the power output end of the case (1), the output end of the direct current filter (4) is electrically connected with the DC/DC power module (81) through two feedthrough capacitors A (6), and the output end of the alternating current filter (5) is electrically connected with the AC/DC power module (82) through three feedthrough capacitors B (7).

2. A filtered power supply system for EMC according to claim 1, wherein: the waterproof case is characterized in that waterproof rubber is arranged outside the case (1), and shielding layers or shielding strips are correspondingly arranged inside a filter installation cavity A (41), a filter installation cavity B (51) and a power module installation cavity (83) of the case (1) respectively.

3. A filtered power supply system for EMC according to claim 1, wherein: the alternating current filter (5) comprises an alternating current filter shell (52), an alternating current line installation cavity (521) is arranged inside the alternating current filter shell (52), the input end of the alternating current filter shell (52) is provided with three input electrodes B (53) which are correspondingly and electrically connected with the connector B (3), the output end of the alternating current filter shell (52) is provided with three output electrodes B (54), the three output electrodes B (54) are electrically connected with three feedthrough capacitors B (7) in a one-to-one correspondence manner, the input electrode B (53) and the output electrode B (54) have the same structure, an alternating current power supply filter circuit is arranged in an alternating current circuit mounting cavity (521) of the alternating current filter shell (52), the input end of the alternating current power supply filter circuit is electrically connected with an input electrode B (53), and the output end of the alternating current power supply filter circuit is electrically connected with an output electrode B (54); the input end of the alternating current power supply filter circuit is sequentially provided with a first common-mode capacitor assembly, a first differential-mode capacitor assembly and a common-mode inductor assembly (L1), and the output end of the alternating current power supply filter circuit is sequentially provided with a second differential-mode capacitor assembly, a second common-mode capacitor assembly, a differential-mode inductor assembly and a third differential-mode capacitor assembly; the direct current filter (4) comprises a direct current filter shell (42), a direct current line mounting cavity (421) is arranged inside the direct current filter shell (42), two input electrodes A (43) which are correspondingly and electrically connected with the connector A (2) are arranged at the input end of the direct current filter shell (42), two output electrodes A (44) are arranged at the output end of the direct current filter shell (42), the two output electrodes A (44) are electrically connected with the two feedthrough capacitors A (6) in a one-to-one correspondence manner, the input electrode A (43) and the output electrode A (44) have the same structure, a direct current power supply filter circuit is arranged in a direct current circuit mounting cavity (421) of the direct current filter shell (42), the input end of the direct-current power supply filter line is electrically connected with an input electrode A (43), and the output end of the direct-current power supply filter line is electrically connected with an output electrode A (44); the direct-current power supply filtering circuit is sequentially connected with a common-mode inductor L5 and a common-mode inductor L6 from an input end to an output end, the input end of the direct-current power supply filtering circuit is electrically connected with a common-mode capacitor Cy3, the output end of the direct-current power supply filtering circuit is electrically connected with a common-mode capacitor Cy4, the input end of the direct-current power supply filtering circuit is connected with a resistor (R), and the direct-current power supply filtering circuit is further electrically connected with a differential-mode capacitor Cx 4.

4. A filtered power supply system for EMC according to claim 3, wherein: the alternating-current power supply filter line comprises an A-phase power transmission line, a B-phase power transmission line and a C-phase power transmission line, the first common-mode capacitor assembly comprises three common-mode capacitors Cy1, and the three common-mode capacitors Cy1 are respectively connected with the A-phase power transmission line, the B-phase power transmission line and the C-phase power transmission line in a one-to-one correspondence manner; the first differential mode capacitance component comprises three differential mode capacitances Cx1, wherein the first differential mode capacitance Cx1 is connected between the A-phase power line and the B-phase power line, the second differential mode capacitance Cx1 is connected between the B-phase power line and the C-phase power line, and the third differential mode capacitance Cx1 is connected between the A-phase power line and the C-phase power line; the common-mode inductance assembly (L1) comprises three common-mode inductances and soft magnetic ferrite magnetic cores, and the three common-mode inductances are respectively connected to the A-phase power transmission line, the B-phase power transmission line and the C-phase power transmission line in a one-to-one correspondence manner; the second differential mode capacitor assembly comprises three differential mode capacitors Cx2, wherein the first differential mode capacitor Cx2 is connected between the A-phase power line and the B-phase power line, the second differential mode capacitor Cx2 is connected between the B-phase power line and the C-phase power line, and the third differential mode capacitor Cx2 is connected between the A-phase power line and the C-phase power line; the second common-mode capacitor assembly comprises three common-mode capacitors Cy2, and the three common-mode capacitors Cy2 are respectively connected with the phase-A power transmission line, the phase-B power transmission line and the phase-C power transmission line in a one-to-one correspondence manner; the differential mode inductance assembly comprises three differential mode inductances, the three differential mode inductances are respectively a first differential mode inductance (L2), a second differential mode inductance (L3) and a third differential mode inductance (L4), the first differential mode inductance (L2) is correspondingly connected to the phase A power transmission line, the second differential mode inductance (L3) is correspondingly connected to the phase B power transmission line, and the third differential mode inductance (L4) is correspondingly connected to the phase C power transmission line; the third differential mode capacitor assembly comprises three differential mode capacitors Cx3, wherein the first differential mode capacitor Cx3 is connected between the A-phase power line and the B-phase power line, the second differential mode capacitor Cx3 is connected between the B-phase power line and the C-phase power line, and the third differential mode capacitor Cx3 is connected between the A-phase power line and the C-phase power line.

5. A filtered power supply system for EMC according to claim 3, wherein: the direct current power supply filter line comprises a positive input line and a negative input line, and the resistor (R) is electrically connected between the positive input line and the negative input line of the input end of the direct current power supply filter line; the common-mode inductor L5 comprises a first inductor coil A, a second inductor coil A and an annular magnetic core A, the first inductor coil A and the second inductor coil A are wound on the annular magnetic core A, the common-mode inductor L6 comprises a first inductor coil B, a second inductor coil B and an annular magnetic core B, the first inductor coil B and the second inductor coil B are wound on the annular magnetic core B, the first inductor coil A and the first inductor coil B are connected to a positive input line, and the first inductor coil B and the second inductor coil B are connected to a negative input line; the number of the common-mode capacitors Cy3 is two, the first common-mode capacitor Cy3 is connected to the positive input line of the input end of the direct-current power supply filter line, and the second common-mode capacitor Cy3 is connected to the negative input line of the input end of the direct-current power supply filter line; the number of the common-mode capacitors Cy4 is two, the first common-mode capacitor Cy4 is connected to the positive input line of the output end of the direct-current power supply filter line, and the second common-mode capacitor Cy4 is connected to the negative input line of the output end of the direct-current power supply filter line; the number of the differential mode capacitors Cx4 is three, the first differential mode capacitor Cx4 is connected between a positive input line and a negative input line of the input end of the direct-current power supply filter circuit, the second differential mode capacitor Cx4 is electrically connected between the positive input line and the negative input line of the direct-current power supply filter circuit between the common mode inductor L5 and the common mode inductor L6, and the third differential mode capacitor Cx4 is connected between the positive input line and the negative input line of the output end of the direct-current power supply filter circuit.

6. A filtered power supply system for EMC according to claim 3, wherein: the structure of the input electrode A (43) is completely the same as that of the input electrode B (53), the input electrode A (43) comprises a screw electrode (10), the screw electrode (10) sequentially comprises an external thread column (11), a square rod part (13) and an internal thread column (14) from left to right, a contact boss (12) is fixed outside the screw electrode (10) between the external thread column (11) and the square rod part (13), a nut A (19) is installed on the external thread column (11) in a threaded manner, an elastic pad A (18) and a flat pad A (17) are sequentially sleeved on the external thread column (11) from left to right, and the elastic pad A (18) and the flat pad A (17) are both located between the nut A (19) and the contact boss (12); an insulator A (15) and an insulator B (16) are sequentially arranged on the square rod part (13) from left to right, a nut B (23) is arranged on the internal thread column (14) in a threaded mode, a flat pad B (20) and an elastic pad B (22) are sequentially arranged on the internal thread column (14) from left to right, and the flat pad B (20) and the elastic pad B (22) are located between the nut B (23) and the insulator B (16); the internal thread column (14) is provided with a wiring hole (141), and the side part of the internal thread column (14) is provided with an air hole (142) communicated with the wiring hole (141).

7. A filtered power supply system for EMC according to claim 6, wherein: an external thread A is arranged outside the internal thread column (14), an external thread B is arranged outside the external thread column (11), and the pitch of the external thread A of the internal thread column (14) is larger than that of the external thread B of the external thread column (11); the cross section of a square rod part (13) of the screw electrode (10) is square, a square hole A matched with the square rod part (13) is formed in the insulator A (15) in a penetrating mode, and a square hole B matched with the square rod part (13) is formed in the insulator B (16) in a penetrating mode.

8. A filtered power supply system for EMC according to claim 6, wherein: the insulator A (15) and the insulator B (16) are both made of insulating materials which can resist the temperature of minus 55 ℃ to plus 125 ℃.

9. A filtered power supply system for EMC according to claim 3, wherein: and heat-conducting pouring sealant is filled in an alternating current circuit mounting cavity (521) of the alternating current filter shell (52).

10. A filtered power supply system for EMC according to claim 3, wherein: heat-conducting pouring sealant is filled and sealed in a direct-current line installation cavity (421) of the direct-current filter shell (42); the annular magnetic core A of the common mode inductor L5 is an amorphous magnetic core, the annular magnetic core B of the common mode inductor L6 is a high-flux magnetic core, the withstand voltages of the differential mode capacitor Cx4 and the differential mode capacitor Cx5 are both larger than 100VDC, and the withstand voltage of the common mode capacitor Cy4 is larger than 250 VDC.