A filter capacitor with combined inductance

Abstract

The present invention provides a filter capacitor with a combined inductor, comprising a housing, a device module and a potting layer, wherein the device module comprises a first magnetic core inductor, a second magnetic core inductor, a first bracket capacitor, a common-mode inductor, a second bracket capacitor, a third magnetic core inductor and a fourth magnetic core inductor, and a metal connecting frame, wherein the upper ends of the first and second magnetic core inductors are respectively connected to the two upper ends of the common-mode inductor through the connecting frame, the lower ends serve as input terminals and extend upwardly to the outside of the potting layer, the other two ends of the common-mode inductor are respectively connected to the lower ends of the third and fourth magnetic core capacitors through the connecting frame, the upper ends of the third and fourth magnetic core capacitors serve as output terminals and extend upwardly to the outside of the potting layer, the two ends of the first bracket capacitor are connected to the two lower ends of the common-mode inductor through the connecting frame, and the two ends of the second bracket capacitor are connected to the other two ends of the common-mode inductor through the connecting frame. The present invention has a modular design, reliable welding, can pre-test filtering performance, can withstand large impacts, and avoid affecting other devices on the circuit board.

Description

Technical Field

[0001] The present invention relates to a filter capacitor with a combined inductor. Background Art

[0002] The function of a filter capacitor is to filter and eliminate DC signals and high-frequency noise in a circuit. To improve the filtering effect, capacitors and inductors are usually combined to form a filter. However, common-mode interference and differential-mode interference are often present in the circuit, so common-mode and differential-mode filter circuits must be designed, which makes the circuit more complex. In actual applications, designers usually design the circuit and then solder the required capacitors and inductors to the circuit board. This method has drawbacks: the welding quality is not stable enough, and the filter performance cannot be tested separately, resulting in low circuit reliability. Secondly, directly soldered components have weak impact resistance and are not suitable for environments with high impact. Furthermore, when the capacitor capacitance is large, direct soldering is not possible, requiring more complex and troublesome measures. Capacitors and inductors are components that generate a lot of heat. If they are accidentally dumped onto the circuit board, the high temperature will affect other components on the board, ultimately leading to more serious consequences. Summary of the Invention

[0003] The present invention provides a filter capacitor with a combined inductor, which has a modular design, reliable welding, can pre-test the filtering performance, can withstand large impacts, and avoid affecting other devices on the circuit board.

[0004] The present invention is achieved through the following technical solutions:

[0005] A filter capacitor with a combined inductor comprises a housing, a device module disposed within the housing, and a potting layer disposed between the housing and the device module. The device module comprises a vertically arranged first magnetic core inductor, a second magnetic core inductor, a first bracket capacitor, a common-mode inductor, a second bracket capacitor, a third magnetic core inductor, and a fourth magnetic core inductor, and a metal connecting frame. The upper ends of the first and second magnetic core inductors are respectively connected to the two upper ends of the common-mode inductor via the connecting frame, and the lower ends serve as input ends and extend upwardly outside the potting layer. The other two ends of the common-mode inductor are respectively connected to the lower ends of the third and fourth magnetic core capacitors via the connecting frame. The upper ends of the third and fourth magnetic core capacitors serve as output ends and extend upwardly outside the potting layer. The two ends of the first bracket capacitor are connected to the two lower ends of the common-mode inductor via the connecting frame, and the two ends of the second bracket capacitor are connected to the other two ends of the common-mode inductor via the connecting frame. The present invention integrates common-mode inductance and differential-mode inductance circuit functions, can be applied to AC or DC circuits according to actual usage conditions, and is more easily adapted to circuits. When in use, the present invention can be welded to a circuit board via two input pads and an output pad, which greatly reduces the complexity of circuit board design and is more convenient for users to use. Moreover, the present invention can directly measure performance after welding, ensuring both welding quality and performance reliability. Furthermore, the present invention connects various components through a reasonable arrangement of a connecting frame, arranging the various components vertically, making the overall volume smaller and the space utilization higher. At the same time, the structural strength is also higher, the mechanical properties are better, the device can withstand large impacts, and has strong shock resistance and environmental adaptability. The present invention arranges both the capacitor and the inductor in a housing, which can prevent their heat from affecting other components on the circuit board, making it safer.

[0006] Furthermore, the connecting frame includes two upper horizontal sections and two lower horizontal sections, one end of an upper horizontal section is connected to the upper pull-out end of the coil of the first magnetic core inductor, and the other end is connected to an upper end of the common-mode inductor, one end of the other upper horizontal section is connected to the upper pull-out end of the coil of the second magnetic core inductor, and the other end is connected to the other upper end of the common-mode inductor, one end of a lower horizontal section is connected to a lower end of the common-mode inductor, and the other end is connected to the lower pull-out end of the coil of the third magnetic core inductor, and one end of another lower horizontal section is connected to the other lower end of the common-mode inductor, and the other end is connected to the lower pull-out end of the coil of the fourth magnetic core inductor.

[0007] Furthermore, the upper horizontal section and the lower horizontal section are both strip-shaped bodies with a certain width.

[0008] Furthermore, the lower pull-out ends of the first magnetic core inductor and the second magnetic core inductor are bent downward to form a U-shaped section, and then extended upward to the outside of the shell as the input end, and the upper pull-out ends of the third magnetic core inductor and the fourth magnetic core inductor are extended upward to the outside of the shell as the output end.

[0009] Furthermore, it also includes an input pad and an output pad, and the input pad and the output pad are both L-shaped. One side of the input pad and the output pad is arranged horizontally on the upper end surface of the shell and the potting layer, and the other side is arranged longitudinally on the outer side surface of the shell. One side of the input pad is connected to the input end, and one side of the output pad is connected to the output end.

[0010] Furthermore, the input end includes a positive input end and a negative input end, the output end includes a positive output end and a negative output end, the positive input end and the negative input end are provided with two opposite input pads, and the positive output end and the negative output end are provided with two opposite output pads.

[0011] Furthermore, the first bracket capacitor and the second bracket capacitor have the same structure, both including a first frame, a second frame and a plurality of chips arranged relatively to each other, the first frame including a first vertical plate, a first horizontal plate arranged at the rear end of the first vertical plate and extending horizontally, a second horizontal plate arranged at the upper end of the first vertical plate and extending horizontally backward longitudinally, three first welding strips are formed at intervals on the first horizontal plate, the second frame including a second vertical plate, a third horizontal plate arranged at the rear end of the second vertical plate and extending horizontally, a fourth horizontal plate arranged at the upper end of the second vertical plate and extending horizontally backward longitudinally, two second welding strips are formed at intervals on the third horizontal plate, each first welding strip is staggered with each second welding strip, and chips are welded between adjacent first welding strips and second welding strips.

[0012] Furthermore, the second transverse plate and the fourth transverse plate of the first bracket capacitor are respectively welded to the lower ends of the two upper horizontal sections, and the second transverse plate and the fourth transverse plate of the second bracket capacitor are respectively welded to the upper ends of the two lower horizontal sections.

[0013] Furthermore, the housing is made of epoxy molding compound. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below with reference to the accompanying drawings.

[0015] Figure 1 Schematic diagram of the circuit of the present invention.

[0016] Figure 2 It is a structural schematic diagram of the present invention.

[0017] Figure 3 This is a schematic diagram of the structure of the present invention after removing the outer shell and the potting layer.

[0018] Figure 4 This is a schematic diagram of the structure of the present invention after removing the housing, potting layer, input pads and output pads.

[0019] Figure 5 This is a schematic structural diagram of the first bracket capacitor of the present invention.

[0020] Figure 6 This is a schematic structural diagram of the first bracket capacitor of the present invention after removing the chip.

[0021] Among them, 1. outer shell; 2. potting layer; 3. first magnetic core inductor; 4. second magnetic core inductor; 341. U-shaped section; 5. third magnetic core inductor; 6. fourth magnetic core inductor; 7. common mode inductor; 8. first bracket capacitor; 81. first frame; 811. first vertical plate; 812. first horizontal plate; 813. second horizontal plate; 814. first welding strip; 82. second frame; 821. second vertical plate; 822. third horizontal plate; 823. fourth horizontal plate; 824. second welding strip; 83. chip; 9. second bracket capacitor; 10. connecting frame; 101. upper horizontal section; 102. lower horizontal section; 11. input pad; 111. positive input terminal; 112. negative input terminal; 12. output pad; 121. positive output terminal; 122. negative output terminal. DETAILED DESCRIPTION

[0022] like Figures 1 to 6 As shown, the filter capacitor with a combined inductor includes a housing 1, a device module arranged in the housing 1, and a potting layer 2 arranged between the housing 1 and the device module. The housing is a rectangular body with an open top made of epoxy molding compound. The device module includes a vertically arranged first magnetic core inductor 3, a second magnetic core inductor 4, a first bracket capacitor 8, a common mode inductor 7, a second bracket capacitor 9, a third magnetic core inductor 5 and a fourth magnetic core inductor 6, as well as a metal connecting frame 10, an input pad 11 and an output pad 12. The upper ends of the first magnetic core inductor 3 and the second magnetic core inductor 4 are respectively connected to the two upper ends of the common mode inductor 7 through the connecting frame 10, and the lower ends serve as input ends and extend upward to the outside of the potting layer 2. The common mode inductor 7 The other two ends are connected to the lower ends of the third and fourth magnetic core inductors 6 through the connecting frame 10 respectively. The upper ends of the third magnetic inductor and the fourth magnetic core inductor 6 serve as output ends and extend upward to the outside of the potting layer 2. The two ends of the first bracket capacitor 8 are connected to the two lower ends of the common-mode inductor 7 through the connecting frame 10. The two ends of the second bracket capacitor 9 are connected to the other two ends of the common-mode inductor 7 through the connecting frame 10. The input pad 11 and the output pad 12 are both L-shaped. One side of the input pad 11 and the output pad 12 is horizontally extended and arranged on the upper end surface of the shell 1 and the potting layer 2, and the other side is longitudinally extended and arranged on the outer side surface of the shell 1. One side of the input pad 11 is connected to the input end, and one side of the output pad 12 is connected to the output end. More specifically, the input terminal includes a positive input terminal 111 and a negative input terminal 112, and the output terminal includes a positive output terminal 121 and a negative output terminal 122. Two opposing input pads 11 are provided at the positive input terminal 111 and the negative input terminal 112, and two opposing output pads 12 are provided at the positive output terminal 121 and the negative output terminal 122. In this embodiment, the negative input terminal 112 and the negative output terminal 122 are both grounded.

[0023] The connecting frame 10 includes two upper horizontal sections 101 and two lower horizontal sections 102. The upper horizontal sections 101 and the lower horizontal sections 102 are each strip-shaped bodies having a certain width. One upper horizontal section 101 has one end connected to the upper extraction end of the coil of the first magnetic core inductor 3 and the other end connected to an upper end of the common-mode inductor 7. The other upper horizontal section 101 has one end connected to the upper extraction end of the coil of the second magnetic core inductor 4 and the other end connected to the other upper end of the common-mode inductor 7. The lower horizontal section 102 has one end connected to the lower end of the common-mode inductor 7 and the other end connected to the lower extraction end of the coil of the third magnetic core inductor 5. The other lower horizontal section 102 has one end connected to the other lower end of the common-mode inductor 7 and the other end connected to the lower extraction end of the coil of the fourth magnetic core inductor 6.

[0024] The lower pull-out ends of the first magnetic core inductor 3 and the second magnetic core inductor 4 are bent downward to form a U-shaped section 341, and then extend upward to the outside of the potting layer 2 as input ends. The upper pull-out ends of the third magnetic core inductor 5 and the fourth magnetic core inductor 6 are extended upward to the outside of the potting layer 2 as output ends.

[0025] The first bracket capacitor 8 and the second bracket capacitor 9 have the same structure, both of which include a first frame 81, a second frame 82 and a plurality of chips 83 arranged relatively to each other, the first frame 81 including a first vertical plate 811, a first horizontal plate 812 arranged at the rear end of the first vertical plate 811 and extending horizontally, a second horizontal plate 813 arranged at the upper end of the first vertical plate 811 and extending horizontally backward in the longitudinal direction, three first welding strips 814 are formed on the first horizontal plate 812 at intervals, the second frame 82 includes a second vertical plate 821, a third horizontal plate 822 arranged at the rear end of the second vertical plate 821 and extending horizontally, a fourth horizontal plate 823 arranged at the upper end of the second vertical plate 821 and extending horizontally backward in the longitudinal direction, two second welding strips 824 are formed on the third horizontal plate 822 at intervals, each first welding strip 814 is staggered with each second welding strip 824, and chips 83 are welded between adjacent first welding strips 814 and second welding strips 824. The second horizontal plate 813 and the fourth horizontal plate 823 of the first bracket capacitor 8 are respectively welded as pads at the lower ends of the two upper horizontal sections 101, and the second horizontal plate 813 and the fourth horizontal plate 823 of the second bracket capacitor 9 are respectively welded as pads at the upper ends of the two lower horizontal sections 102.

[0026] The above description is merely a preferred embodiment of the present invention and therefore cannot be used to limit the scope of the present invention. In other words, equivalent changes and modifications made according to the scope of the patent application and the contents of the specification should still fall within the scope of the patent of the present invention.

Claims

1. A filter capacitor with a combined inductor, characterized in that: The invention comprises a shell, a device module arranged in the shell, and a potting layer arranged between the shell and the device module, wherein the device module comprises a first magnetic core inductor, a second magnetic core inductor, a first bracket capacitor, a common mode inductor, a second bracket capacitor, a third magnetic core inductor and a fourth magnetic core inductor arranged vertically, and a metal connecting frame, wherein the upper ends of the first and second magnetic core inductors are respectively connected to the two upper ends of the common mode inductor through the connecting frame, and the lower end serves as an input end and extends upward to the outside of the shell, and the other two ends of the common mode inductor are respectively connected to the lower ends of the third and fourth magnetic core inductors through the connecting frame, and the upper ends of the third and fourth magnetic core inductors serve as output ends and extend upward to the outside of the shell, and the two ends of the first bracket capacitor are connected to the lower ends of the third and fourth magnetic core inductors through the connecting frame. The two lower ends of the common-mode inductor are connected, and the two ends of the second bracket capacitor are connected to the other two ends of the common-mode inductor through a connecting frame; the connecting frame includes two upper horizontal sections and two lower horizontal sections, one end of an upper horizontal section is connected to the upper withdrawal end of the coil of the first magnetic core inductor, and the other end is connected to an upper end of the common-mode inductor, one end of the other upper horizontal section is connected to the upper withdrawal end of the coil of the second magnetic core inductor, and the other end is connected to the other upper end of the common-mode inductor, one end of a lower horizontal section is connected to a lower end of the common-mode inductor, and the other end is connected to the lower withdrawal end of the coil of the third magnetic core inductor, and one end of the other lower horizontal section is connected to the other lower end of the common-mode inductor, and the other end is connected to the lower withdrawal end of the coil of the fourth magnetic core inductor.

2. The filter capacitor with combined inductance according to claim 1, characterized in that: The upper horizontal section and the lower horizontal section are both strip-shaped with a certain width.

3. A filter capacitor with a combined inductor according to claim 1 or 2, characterized in that: The lower pull-out ends of the first magnetic core inductor and the second magnetic core inductor are bent downward to form a U-shaped section, and then extend upward to the outside of the shell to serve as the input end. The upper pull-out ends of the third magnetic core inductor and the fourth magnetic core inductor are extended upward to the outside of the shell to serve as the output end.

4. A filter capacitor with a combined inductor according to claim 1 or 2, characterized in that: It also includes an input pad and an output pad, both of which are L-shaped. One side of the input pad and the output pad is arranged on the upper end surface of the shell and the potting layer in a horizontal extension, and the other side is arranged on the outer side surface of the shell in a longitudinal extension. One side of the input pad is connected to the input end, and one side of the output pad is connected to the output end.

5. The filter capacitor with combined inductance according to claim 4, characterized in that: The input pad includes a positive input terminal and a negative input terminal, and the output pad includes a positive output terminal and a negative output terminal. Two opposite input pads are provided at the positive input terminal and the negative input terminal, and two opposite output pads are provided at the positive output terminal and the negative output terminal.

6. The filter capacitor with combined inductance according to claim 5, characterized in that: The first bracket capacitor and the second bracket capacitor have the same structure, both including a first frame, a second frame and a plurality of chips arranged relatively to each other, the first frame including a first vertical plate, a first horizontal plate arranged at the rear end of the first vertical plate and extending horizontally, a second horizontal plate arranged at the upper end of the first vertical plate and extending horizontally backward longitudinally, three first welding strips are formed at intervals on the first horizontal plate, the second frame including a second vertical plate, a third horizontal plate arranged at the rear end of the second vertical plate and extending horizontally, a fourth horizontal plate arranged at the upper end of the second vertical plate and extending horizontally backward longitudinally, two second welding strips are formed at intervals on the third horizontal plate, each first welding strip is staggered with each second welding strip, and chips are welded between adjacent first welding strips and second welding strips.

7. The filter capacitor with combined inductance according to claim 6, characterized in that: The second transverse plate and the fourth transverse plate of the first bracket capacitor are respectively welded to the lower ends of the two upper horizontal sections, and the second transverse plate and the fourth transverse plate of the second bracket capacitor are respectively welded to the upper ends of the two lower horizontal sections.

8. A filter capacitor with a combined inductor according to claim 1 or 2, characterized in that: The housing is made of epoxy molding compound.

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