Large-current AC / DC filtering power supply system based on multifunctional shunt

Abstract

The invention discloses a large-current AC / DC filtering power supply system based on a multifunctional shunt, which belongs to the technical field of filtering power supplies and comprises a base, a DC filtering module, a monitoring module, a cover plate, an AC / DC conversion module, a shunt seat and a short-circuit protection module, the monitoring module and the short-circuit protection module are installed on the diverter base and jointly form a multifunctional diverter, the direct-current filtering module and the multifunctional diverter are arranged in a direct-current filtering inner cavity of the base, and the alternating-current and direct-current conversion module is arranged in an alternating-current and direct-current conversion inner cavity of the base. The short-circuit protection module comprises a circuit board, an input confluence sheet, an output confluence sheet and a plurality of elastic double-end studs, the input confluence sheet and the output confluence sheet are respectively connected with studs at one ends of the plurality of elastic double-end studs through screws, and studs at the other ends of the plurality of elastic double-end studs are respectively connected with the circuit board through screws. According to the invention, the multifunctional shunt is convenient to assemble, the occupied space is reduced, and the circuit board is prevented from being damaged during assembly or application.

Description

Technical Field

[0001] This invention belongs to the field of power supply filtering technology, specifically relating to a high-current AC / DC power supply system based on a multi-functional shunt. Background Technology

[0002] A filtered power supply system is a power supply system with filtering capabilities, typically a DC power supply. The basic structure of a traditional filtered power supply system includes a housing and a filtering module. The housing has input and output terminals that connect to the filtering module. The filtering module is generally a filtering circuit composed of inductors and capacitors; the specific type and number of inductors and capacitors depend on the requirements. To meet the purpose of monitoring current and / or voltage, some filtered power supply systems connect a shunt in series on the negative line of the DC power input. Traditional shunts mainly consist of monitoring modules that only monitor current and / or voltage.

[0003] The aforementioned traditional filter power supply system has the following drawbacks: Due to electromagnetic compatibility interference and other reasons, it lacks an integrated AC / DC conversion system. However, there is a demand for integrated applications in practice, which the traditional filter power supply system cannot meet. The shunt in the traditional filter power supply system has a single function and lacks short-circuit protection. When short-circuit protection is required, fuses and contactors are typically used for passive short-circuit protection, resulting in slow response and large space requirements. Traditional short-circuit protection circuits are generally used for low-current circuits of no more than 20A and cannot be applied to high-current short-circuit protection. Furthermore, the shunt in the traditional filter power supply system uses very thick and stiff high-current wires as connecting wires, which not only occupy a large space but also make bending and straightening difficult during assembly, increasing assembly complexity. Additionally, the seal between the cover and base of the traditional filter power supply system uses only a sealing ring, lacking hydrophobic properties. External condensation may enter the internal space, affecting the normal operation of the circuit. Summary of the Invention

[0004] The purpose of this invention is to provide a high-current AC / DC filtering power supply system based on a multi-functional shunt, which combines DC filtering, AC / DC conversion, and short-circuit protection through circuitry, in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A high-current AC / DC filtering power supply system based on a multi-functional shunt includes a base, a DC filtering module, a monitoring module, and a cover plate. The base has an inner cavity with an upper opening, and the cover plate is installed at the upper end of the inner cavity. The DC filtering module is placed inside the inner cavity. The inner cavity wall has a positive input terminal, a negative input terminal, a positive output terminal, and a negative output terminal. The input terminal of the monitoring module, used for monitoring current and / or voltage, is connected to the negative input terminal. The positive input terminal, the output terminal of the monitoring module, the positive output terminal, and the negative output terminal are respectively connected to the DC filtering module. The high-current AC / DC filtering power supply system based on a multi-functional shunt also includes an AC / DC conversion module, a shunt mount, and a short-circuit protection module. The inner cavity of the base has a vertical partition that isolates the inner cavity into a DC filtering cavity and an AC / DC conversion cavity. The upper end of the base and the upper end of the partition have shielding grooves. The shielding grooves have a connection to the lower part of the cover plate. A conductive rubber ring with tight contact is used. The monitoring module and the short-circuit protection module are mounted on the shunt holder and together form the multi-functional shunt. The DC filter module and the multi-functional shunt are placed inside the DC filter cavity. The AC / DC conversion module is placed inside the AC / DC conversion cavity. The short-circuit protection module includes a circuit board for short-circuit protection, a flat strip-shaped input busbar, a flat strip-shaped output busbar, and multiple elastic double-ended studs. The input busbar and the output busbar are respectively mounted on the shunt holder. One end of the input busbar is connected to the output end of the monitoring module, and one end of the output busbar is correspondingly connected to the DC filter module. The elastic double-ended stud includes a spring and studs mounted on both ends of the spring. The other ends of the input busbar and the other ends of the output busbar are respectively connected to the studs at one end of the multiple elastic double-ended studs by screws. The studs at the other ends of the multiple elastic double-ended studs are respectively connected to the circuit board by screws. In the above structure, the DC filter module, monitoring module, and AC / DC conversion module are all existing technologies. Their specific structures can be implemented using existing technologies according to application needs and are not related to the innovation of this application. The relevant short-circuit protection components on the above circuit board, except for the structure using IGBT tubes and high-frequency filters described below, are also existing technologies and are not related to the innovation of this application.

[0006] Preferably, to improve the response speed of short-circuit protection and filter out high-frequency noise on the input busbar, the short-circuit protection module further includes an IGBT transistor as a short-circuit protection switching component and a high-frequency filter for high-frequency filtering. The IGBT transistor is mounted on the shunt socket via a heat sink and is correspondingly connected to the circuit board. The high-frequency filter is mounted on the input busbar. The high-frequency filter here is insulated from the input busbar; this is prior art and not related to the innovation of this application.

[0007] Preferably, to facilitate assembly and avoid the use of thick, stiff wires for more space, the positive input terminal is connected to the DC filter module, the output busbar is connected to the DC filter module, the positive output terminal is connected to the DC filter module, and the negative output terminal is connected to the DC filter module via flat strip connecting busbars.

[0008] Preferably, in order to filter the AC signal and reliably isolate the DC output, the cavity wall of the AC-DC converter is provided with an AC input terminal. The AC input terminal is connected to the filter bead and then to the input terminal of the AC-DC converter module. The output terminal of the AC-DC converter module is connected to an output isolation feedthrough capacitor.

[0009] Preferably, in order to achieve a better sealing effect and increase drainage function to achieve double waterproof function, the upper end of the base is provided with a sealing groove outside the corresponding shielding groove and a sealing ring is installed in the sealing groove. The upper end of the base is provided with a drainage groove outside the sealing groove, and the bottom of the drainage groove is provided with a drainage hole that connects to the outside of the base.

[0010] The beneficial effects of this invention are as follows: This invention integrates a DC filter module, an AC / DC conversion module, and a multi-functional shunt into a single unit, forming a high-current filtered power supply system with DC filtering, voltage and / or current monitoring, short-circuit protection, and AC / DC conversion functions to meet application requirements. By using busbars as connecting wires and connecting the busbars to the circuit board with flexible double-ended studs, it achieves multiple functions such as easy assembly of the multi-functional shunt, reduced space occupation, and avoidance of circuit board damage during assembly or application in vibration environments caused by hard connection between the circuit board and the busbars. Attached Figure Description

[0011] Figure 1 This is a perspective view of the high-current AC / DC filter power supply system based on the multi-functional shunt described in this invention before assembly. The cover plate, the top plate of the DC filter module, and the top plate of the AC / DC conversion module are not shown in the figure. Figure 2 This is a three-dimensional view of the high-current AC / DC filter power supply system based on the multi-functional shunt described in this invention after assembly. The cover plate, the top plate of the DC filter module, and the top plate of the AC / DC conversion module are not shown in the figure. Figure 3 yes Figure 2 Enlarged image of the letter "A" in the image; Figure 4 This is a perspective view of the high-current AC / DC filter power supply system based on a multi-functional shunt as described in this invention before the multi-functional shunt is assembled. Figure 5 yes Figure 4 A magnified view of the letter "B" in the image; Figure 6 This is a three-dimensional view of the assembled multi-functional shunt portion of the high-current AC / DC filter power supply system based on the multi-functional shunt described in this invention. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings: like Figures 1-6 As shown, the high-current AC / DC filtering power supply system based on a multi-functional shunt according to the present invention includes a base 2, a DC filtering module 6, a monitoring module 20, a cover plate (not shown in the figure), an AC / DC conversion module 14, a shunt holder 19, and a short-circuit protection module (not marked in the figure, refer to the structure below). The base 2 has an inner cavity with an upper opening, and the cover plate is installed at the upper end of the inner cavity. The inner cavity of the base is provided with a vertical partition 11, which isolates the inner cavity of the base into a DC filtering inner cavity 4 and an AC / DC conversion inner cavity 12. The upper end of the base 2 and the upper end of the partition 11 are respectively provided with shielding grooves. The shielding groove is provided with a conductive rubber ring 16 that is in close contact with the underside of the cover plate. The cavity wall of the DC filter cavity 4 is provided with a positive input terminal 7, a negative input terminal 5, a positive output terminal 8, and a negative output terminal 10. The input terminal of the monitoring module 20, used for monitoring current and / or voltage, is connected to the negative input terminal 5. The positive input terminal 7, the output terminal of the monitoring module 20, the positive output terminal 8, and the negative output terminal 10 are respectively connected to the DC filter module 6. The monitoring module 20 and the short-circuit protection module are mounted on the shunt holder 19 and together form a multi-functional shunt 1. The DC filter module 6... The multi-functional shunt 1 is placed inside the DC filter cavity 4, and the AC / DC conversion module 14 is placed inside the AC / DC conversion cavity 12. The short-circuit protection module includes a circuit board 26 for implementing short-circuit protection, a flat strip-shaped input busbar 24, a flat strip-shaped output busbar 30, and multiple elastic double-ended studs 27. The input busbar 24 and the output busbar 30 are respectively mounted on the shunt base 19. One end of the input busbar 24 is connected to the output end of the monitoring module 20, and one end of the output busbar 30 is correspondingly connected to the DC filter module 6. The elastic double-ended studs 27 include a spring 32 and a retaining clip. The studs 31 mounted at both ends of the spring 32, the other end of the input busbar 24, and the other end of the output busbar 30 are respectively connected to the studs 31 at one end of a plurality of elastic double-ended studs 27 by screws. Specifically, the plurality of screws pass through the plurality of through holes on the input busbar 24 and the output busbar 30 and are connected to the studs 31 at one end of the plurality of elastic double-ended studs 27. The studs 31 at the other end of the plurality of elastic double-ended studs 27 are respectively connected to the circuit board 26 by screws. Specifically, the plurality of screws pass through the plurality of through holes on the circuit board 26 and are connected to the studs 31 at the other end of the plurality of elastic double-ended studs 27.

[0013] like Figures 1-6 As shown, the present invention also discloses the following more optimized specific structures: In order to improve the response speed of short circuit protection and filter out high-frequency noise on the input busbar 24, the short circuit protection module also includes an IGBT 28 as a short circuit protection switch component and a high-frequency filter 22 for high-frequency filtering. The IGBT 28 is mounted on the shunt holder 19 through the heat sink 29 and is connected to the circuit board 26 accordingly. The high-frequency filter 22 is mounted on the input busbar 24.

[0014] To facilitate assembly and avoid the use of thick, stiff wires, the positive input terminal 7 is connected to the DC filter module 6, the output busbar 30 is connected to the DC filter module 6, the positive output terminal 8 is connected to the DC filter module 6, and the negative output terminal 10 is connected to the DC filter module 6 via flat strip connecting busbars 3.

[0015] In order to filter the AC signal and reliably isolate the DC output, the AC-DC converter cavity 12 is provided with an AC input terminal 9 on its cavity wall. The AC input terminal 9 is connected to the filter bead 13 and then connected to the input terminal of the AC-DC converter module 14. The output terminal of the AC-DC converter module 14 is connected to an output isolation feedthrough capacitor 15. As for the external wiring terminals of the output terminal of the AC-DC converter module 14, they are determined according to actual needs and are not shown in the figure.

[0016] To achieve a better sealing effect and increase drainage function to achieve double waterproof function, a sealing groove is provided at the upper end of the base 2 outside the corresponding shielding groove, and a sealing ring 17 is installed in the sealing groove. A drainage groove 18 is provided at the upper end of the base 2 outside the sealing groove, and a drainage hole (not visible in the figure) is provided at the bottom of the drainage groove 18 to the outside of the base 2.

[0017] Figure 4 and Figure 6 The diagram also shows an insulating thermal pad 21 located between the monitoring module 20 and the shunt seat 19, a shunt top plate 23 located at the upper end of the short-circuit protection module and connected to the shunt seat 19, and an installation cavity 25 located on the shunt seat 19 for mounting the short-circuit protection module. These structures are not conventional adaptive structures.

[0018] In addition, the present invention preferably adopts the following structure: a high-flux magnetic core is added to the DC filter module 6 as a differential-mode inductor. This inductor has high DC superposition characteristics and can be used in a 300A differential-mode circuit without saturation. A fixing fixture is used to fix the two differential-mode and two common-mode inductors together, effectively reducing the space volume. The filter circuit and the line-to-line and line-to-ground capacitors are integrated into a filter unit, which can be filled with thermally conductive adhesive for heat dissipation. The AC-DC conversion module 14 adds a DC-DC conversion circuit to output a DC signal to the short-circuit protection module as a reference voltage, which can ensure the stability of the voltage and reflect the correlation between the AC and DC systems.

[0019] like Figures 1-6 As shown, in application, the positive input terminal 7 and the negative input terminal 5 are connected to the corresponding DC power supply, the positive output terminal 8 and the negative output terminal 10 are connected to the corresponding electrical equipment, the AC input terminal 9 is connected to the AC power supply, and the output terminal of the AC-DC conversion module 14 is connected to another electrical equipment, thus meeting the actual application requirements. In the DC power supply circuit, both the positive and negative lines are filtered by the DC filter module 6. The negative line uses a multi-functional shunt to sample the current and / or voltage. The sampled voltage is compared with the reference voltage taken from the AC-DC conversion module 14, which serves as the basis for controlling the switching of the IGBT 28, thereby realizing the control of the DC circuit on / off and the corresponding short-circuit protection function.

[0020] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A high-current AC / DC filtering power supply system based on a multifunctional shunt, comprising a base, a DC filtering module, a monitoring module, and a cover plate, wherein the base has an inner cavity with an upper opening and the cover plate is installed at the upper end of the inner cavity; the DC filtering module is placed inside the inner cavity; the inner cavity wall of the base has a positive input terminal, a negative input terminal, a positive output terminal, and a negative output terminal; the input terminal of the monitoring module for monitoring current and / or voltage is connected to the negative input terminal; the positive input terminal, the output terminal of the monitoring module, the positive output terminal, and the negative output terminal are respectively connected to the DC filtering module, characterized in that: The high-current AC / DC filtering power supply system based on a multi-functional shunt also includes an AC / DC conversion module, a shunt base, and a short-circuit protection module. A vertical partition is provided inside the base cavity, dividing the cavity into a DC filtering cavity and an AC / DC conversion cavity. Shielding grooves are provided at the upper ends of the base and the partition, respectively. Conductive rubber rings are placed within the shielding grooves, making close contact with the underside of the cover plate. The monitoring module and the short-circuit protection module are mounted on the shunt base and together form the multi-functional shunt. The DC filtering module and the multi-functional shunt are placed inside the DC filtering cavity, and the AC / DC conversion module is placed inside the AC / DC conversion cavity. The short-circuit protection module... The protection module includes a circuit board for short-circuit protection, a flat strip-shaped input busbar, a flat strip-shaped output busbar, and multiple flexible double-ended studs. The input busbar and the output busbar are respectively mounted on the shunt mount. One end of the input busbar is connected to the output end of the monitoring module, and one end of the output busbar is correspondingly connected to the DC filter module. The flexible double-ended studs include a spring and studs mounted on both ends of the spring. The other ends of the input busbar and the other ends of the output busbar are respectively connected to the studs at one end of the multiple flexible double-ended studs by screws. The studs at the other ends of the multiple flexible double-ended studs are respectively connected to the circuit board by screws.

2. The high-current AC / DC filter power supply system based on a multi-functional shunt as described in claim 1, characterized in that: The short-circuit protection module also includes an IGBT transistor as a short-circuit protection switch and a high-frequency filter for high-frequency filtering. The IGBT transistor is mounted on the shunt socket via a heat sink and is connected to the circuit board accordingly. The high-frequency filter is mounted on the input busbar.

3. The high-current AC / DC filter power supply system based on a multi-functional shunt as described in claim 1 or 2, characterized in that: The positive input terminal is connected to the DC filter module, the output busbar is connected to the DC filter module, the positive output terminal is connected to the DC filter module, and the negative output terminal is connected to the DC filter module, respectively, through flat strip connecting busbars.

4. The high-current AC / DC filter power supply system based on a multi-functional shunt according to claim 1 or 2, characterized in that: The AC-DC converter cavity has an AC input terminal on its wall. The AC input terminal is connected to a filter bead and then to the input terminal of the AC-DC converter module. The output terminal of the AC-DC converter module is connected to an output isolation feedthrough capacitor.

5. The high-current AC / DC filter power supply system based on a multi-functional shunt according to claim 1 or 2, characterized in that: The upper end of the base is provided with a sealing groove outside the corresponding shielding groove, and a sealing ring is installed in the sealing groove. The upper end of the base is provided with a drainage groove outside the sealing groove, and the bottom of the drainage groove is provided with a drainage hole that connects to the outside of the base.

Images