PCB (printed circuit board), PCB circuit board and ultrathin filter made of PCB circuit board

Abstract

The utility model discloses an ultrathin filter, which comprises a circuit board, an inductor, a capacitor and an active filter circuit, the circuit board is at least hollowed five areas, terminal hole positions are reserved on the peripheries of the areas, and the hollowed areas at least occupy more than 30% of the area of the board; the number of the inductors is at least four, the inductors are arranged in the four hollowed-out areas respectively, and the terminals are welded to the positions of reserved terminal holes in the peripheries of the areas. The at least two capacitors are arranged in the remaining hollow area, and the terminals are welded at the positions of the reserved terminal holes on the periphery of the area. According to the utility model, the inductor and the capacitor with larger volumes in the filter are embedded in the circuit board, and most of the rest components are packaged by surface-mounted devices, so that the ultrathin filter design is realized, and the filter has excellent filtering performance; the product is attractive in structure, uniform in device distribution, good in heat dissipation effect, simple in manufacturing process and good in product performance consistency.

Description

Technical Field

[0001] The utility model belongs to the field of filters, and particularly relates to a PCB board, a PCB circuit board and an ultra-thin filter made thereof. Background Technique

[0002] With the continuous development of electronic circuit technology, the power density of switching power supplies is constantly increasing. High efficiency, high reliability, high-frequency design and low cost have become the development direction of switching power supplies. The filtering circuit of the switching power supply itself is limited. Correspondingly, there is an increasing demand for electromagnetic compatibility filters that can be used in conjunction with switching power supplies and enable the entire switching power supply to meet higher electromagnetic compatibility performance and be thinner.

[0003] Traditional filters are easy to design and manufacture. Inductors and capacitors are placed above the circuit board and then assembled with the housing base. The height has become a major disadvantage. As the power density of switching power supplies continues to increase, the disadvantages of traditional filters have become increasingly obvious. When higher performance is required, because the better the performance of the filter, the greater the current, the larger the structure of the inductor and capacitor components inside, the overall height of the filter will be very high, and the volume of the filter will be very large, making it impossible to be used in conjunction with ultra-thin brick-type power supplies. Moreover, there are components closely adjacent to the inductor, resulting in poor heat dissipation. Content of the Utility Model

[0004] In view of the deficiencies of the prior art, the utility model provides an ultra-thin filter, which is suitable for supporting switching power supply products with limited height and high electromagnetic compatibility levels to meet market demands.

[0005] In order to achieve the above object, the utility model adopts the following technical solutions:

[0006] An ultra-thin filter includes a circuit board, inductors, capacitors and components of an active filtering circuit. The PCB board is provided with more than 4 hollow areas, and terminal holes are provided around the hollow areas. The pin terminals of the inductors and capacitors are fixedly installed at the positions of the terminal holes to make the inductors and capacitors lie flat and suspended in the hollow areas of the PCB board; there are more than 3 inductors, each occupying 1 hollow area of the PCB board; the components of the active filtering circuit are arranged in the non-hollow areas of the PCB board.

[0007] Preferably, the total area of several hollow areas opened on the circuit board accounts for more than 30% of the board area.

[0008] Preferably, the shapes of the hollow areas of the circuit board include circles, rectangles and "convex" shapes.

[0009] Preferably, the inductor includes two shapes. One is a common-mode inductor made of a toroidal magnetic core, and the other is a differential-mode inductor made of a square combined magnetic core. The main bodies of both inductors are assembled and lie flat and suspended in the hollow areas of the circuit board.

[0010] Preferably, the capacitor is a metal film capacitor, and there are two or more of them. The capacitor bodies are laid flat in pairs with their sides close together, and assembled in a hollowed-out area.

[0011] Preferably, the PCB board is double-sided and rectangular, with notches at all four corners, and the notches are of the same shape.

[0012] Preferably, when the ultra-thin filter is not fitted with a housing, its overall height is equal to the highest point of the inductor.

[0013] This utility model also provides a PCB board suitable for ultra-thin filters. The PCB board is rectangular and has four or more cut-out areas. The cut-out areas include circular, rectangular and "convex" shapes.

[0014] Preferably, the PCB board has notches at all four corners, and the notches are all the same shape.

[0015] This utility model also provides a PCB circuit board suitable for ultra-thin filters, including a PCB board and components of a common-mode inductor, differential-mode inductor, capacitor, and active filter circuit assembled thereon. The PCB board has four or more cut-out areas, and the total area of ​​the cut-out areas accounts for more than 30% of the board area. Terminal holes are provided around the cut-out areas. The pin terminals of the common-mode inductor, differential-mode inductor, and capacitor are fixedly installed at the terminal hole positions, so that the common-mode inductor, differential-mode inductor, and capacitor are suspended flat in the cut-out areas of the circuit board. The components of the active filter circuit are arranged in the non-cut-out areas of the circuit board. The overall height of the PCB circuit board is not higher than the height of the tallest inductor.

[0016] This utility model provides another ultra-thin filter, applicable to ultra-thin filters, including a PCB board and inductors, capacitors and active filter circuit components assembled thereon. The PCB board has 5 cutout areas, and terminal holes are opened around the cutout areas. Inductors and capacitors are fixedly mounted on the PCB board through the terminal holes. There are 4 inductors, which are placed in the 4 cutout areas respectively. There are 2 capacitors, with the capacitor bodies lying flat in pairs and their sides close together, assembled and placed in 1 cutout area. The active filter circuit components are arranged in the non-cutout areas of the PCB board.

[0017] The beneficial effects of this ultrathin filter are as follows:

[0018] 1. The largest components of the filter, the inductor and capacitor, are laid flat and suspended in the cutout area of ​​the circuit board, so that the main body of the inductor and capacitor is embedded and penetrates the circuit board. This ensures that the overall height of the filter, without the casing, is no higher than the height of the tallest inductor. Furthermore, the windings on both sides of the inductor are exposed and not in close proximity to nearby components, resulting in good heat dissipation.

[0019] 2. In traditional filters, the inductors and capacitors are soldered onto a board, requiring consideration of the component's floating height. This invention eliminates this need.

[0020] 3. The inductors and capacitors are laid flat, which greatly reduces the overall height of the product.

[0021] 4. By placing components on both sides of the circuit board, active filter circuits can be placed without affecting the overall height. The combination of active and passive filter solutions can greatly improve filtering performance.

[0022] 5. The power devices are distributed throughout the circuit board, with a large heat dissipation area and good heat dissipation effect. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the ultrathin filter of this utility model from a frontal view.

[0024] Figure 2 This is a three-dimensional structural view of the ultrathin filter of this utility model from the rear view.

[0025] Figure 3 This is a three-dimensional exploded view of the ultrathin filter of this utility model;

[0026] Figure 4 This is a three-dimensional structural diagram of the PCB board of the ultra-thin filter of this utility model, mainly indicating the cut-out areas;

[0027] Figure 5 This is a three-dimensional structural diagram of the PCB board of the ultra-thin filter of this utility model, mainly showing the terminal holes.

[0028] The reference numerals in the above figures are as follows:

[0029] 1. PCB board; 11. Notch; 2. Cutout area; 21. 22. 23. Circular cutout area; 24. Rectangular cutout area; 25. "U" shaped cutout area; 21. 22. 23. 24. 25. Terminal hole; 3. 4. 5. Common mode inductor; 6. Differential mode inductor; 7. 8. Capacitor; 9. Components Detailed Implementation

[0030] To make the technical solution and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the utility model.

[0031] like Figures 1 to 3As shown in the figure, a kind of ultra-thin filter provided by the utility model includes a PCB board 1, a hollowed-out area 2, a first common-mode inductor 3, a second common-mode inductor 4, a third common-mode inductor 5, a differential-mode inductor 6, a first metal film capacitor 7, a second metal film capacitor 8, and components 9 of an active filter circuit. The common-mode inductors are made of toroidal magnetic cores, and the differential-mode inductor is made of a square combined magnetic core. There are more than 4 hollowed-out areas on the PCB board. In this embodiment, there are 5 hollowed-out areas on the PCB board 1. The total area of several hollowed-out areas accounts for more than 30% of the board area. Terminal holes are provided around the hollowed-out areas. The pin terminals of the common-mode inductors 3, 4, 5, the differential-mode inductor 6, and the capacitors 7, 8 are fixedly installed at the positions of the terminal holes, so that the common-mode inductors 3, 4, 5, the differential-mode inductor 6 and the capacitors 7, 8 lie flat and are suspended in the hollowed-out area 2 of the PCB board 1; the components 9 of the active filter circuit are composed of components such as amplifiers, resistors, and chip capacitors, and most of them are selected in chip package structures and arranged in the non-hollowed-out areas of the PCB board 1, including the upper surface and the lower surface of the PCB board, without affecting the overall height of the filter product. Since the inductors and capacitors with the largest volume in the filter lie flat and are suspended in the hollowed-out area of the circuit board, the main bodies of the inductors and capacitors can be embedded in and penetrate through the circuit board, so that the overall height of the PCB circuit board for assembling these electronic components is not higher than the height of the highest inductor, that is, the overall height of the PCB circuit board of the filter without the shell can be equal to the height of the highest inductor. Thus, an ultra-thin filter design is realized, and excellent filtering performance is also achieved; the structure of the product is beautiful, the devices are evenly distributed, the heat dissipation effect is good, the manufacturing process is simple, and the product performance consistency is good.

[0032] As Figures 4 to 5 shown, the three-dimensional structure diagram of the PCB board of the ultra-thin filter of the utility model is shown. There are 5 hollowed-out areas on the PCB board 1, corresponding to circular hollowed-out areas 21, 22, 23, corresponding rectangular hollowed-out area 24, and corresponding "convex"-shaped hollowed-out area 25. Terminal hole positions 211, 221, 231, 241, 251 are respectively reserved around the hollowed-out areas. The sizes and positions of the terminal hole positions are determined according to the terminal pins of the placed devices and the requirements of fixed installation. Preferably, the PCB board 1 adopts a double-sided board. The PCB board is rectangular, and there are notches 11 at all four corners, and the shapes of the notches 11 are the same.

[0033] Place the first common-mode inductor 3, the second common-mode inductor 4, and the third common-mode inductor 5 in the hollowed-out areas 21, 22, 23 respectively, and weld their pins at the reserved terminal hole positions 211, 221, 231. Place the differential-mode inductor 6 in the hollowed-out area 25, and weld its pins at the reserved terminal hole position 251. Place the first metal film capacitor 7 and the second metal film capacitor 8 lying flat and closely adjacent to each other on the side in the hollowed-out area 24, and weld their pins at the reserved terminal hole position 241; arrange the components 9 of the active filter circuit in the non-hollowed-out areas on both sides of the PCB board 1.

[0034] The main heat-generating components, the first common-mode inductor 3, the second common-mode inductor 4, the third common-mode inductor 5, and the differential-mode inductor 6, are laid flat in the cut-out areas 21, 22, 23, and 25. This not only disperses them on the PCB board, preventing them from being in close proximity to other components, but also exposes the upper and lower main heat-generating surfaces of the components for heat dissipation. This not only significantly reduces the overall height of the filter but also facilitates heat dissipation for the main heat-generating components such as inductors, making it easier to meet the requirements of high-current applications.

[0035] The above embodiments are only used to help understand the method and core idea of ​​this utility model. For those skilled in the art, other equivalent application schemes that can be naturally associated with the above description and examples without departing from the principle of this utility model, as well as some improvements and modifications to this utility model, all fall within the protection scope of the claims of this utility model.

Claims

1. An ultra-thin filter, comprising a PCB board, inductors, capacitors and components of an active filter circuit, characterized in that: The PCB board is provided with more than 4 hollowed-out areas, and terminal holes are provided around the hollowed-out areas. The pin terminals of the inductors and capacitors are fixedly installed at the positions of the terminal holes, so that the inductors and capacitors lie flat and are suspended in the hollowed-out areas of the PCB board; There are more than 3 inductors, each occupying 1 hollowed-out area of the PCB board; The components of the active filter circuit are arranged in the non-hollowed-out areas of the PCB board.

2. The ultrathin filter according to claim 1, characterized in that: The total area of several hollowed-out areas provided on the PCB board accounts for more than 30% of the board area.

3. The ultrathin filter according to claim 1, characterized in that: The shapes of the hollowed-out areas of the PCB board include circles, rectangles and "convex" shapes.

4. The ultrathin filter according to claim 1, characterized in that: The inductor includes two shapes. One is a common-mode inductor made of a toroidal magnetic core, and the other is a differential-mode inductor made of a square combined magnetic core. The main bodies of both inductors are assembled and lie flat and are suspended in the hollowed-out areas of the PCB board.

5. The ultrathin filter according to claim 1, characterized in that: The capacitor is a metal film capacitor, and there are more than 2 capacitors. The capacitor bodies lie flat in pairs and are close to each other on the side, and are assembled and placed in one hollowed-out area.

6. The ultrathin filter according to claim 1, characterized in that: The PCB board uses double-sided layout. The PCB board is rectangular, and there are gaps at all four corners, and the shapes of the gaps are the same.

7. The ultrathin filter according to claim 1, characterized in that: When the ultra-thin filter is not equipped with a housing, the overall height is equal to the highest height of the inductors.

8. A PCB board suitable for the ultra-thin filter as described in claim 1, characterized in that: The PCB board is rectangular and is provided with more than 4 hollowed-out areas. The shapes of the hollowed-out areas include circles, rectangles and "convex" shapes.

9. The PCB board according to claim 8, characterized in that: There are gaps at all four corners of the PCB board, and the shapes of the gaps are the same.

10. A PCB circuit board suitable for ultra-thin filters, comprising a PCB board and components such as a common-mode inductor, a differential-mode inductor, a capacitor, and an active filter circuit assembled thereon, characterized in that: The PCB board is provided with more than 4 hollowed-out areas, and the total area of several hollowed-out areas accounts for more than 30% of the board area. Terminal holes are provided around the hollowed-out areas. The pin terminals of the common-mode inductor, differential-mode inductor and capacitor are fixedly installed at the positions of the terminal holes, so that the common-mode inductor, differential-mode inductor and capacitor lie flat and are suspended in the hollowed-out areas of the PCB board; The components of the active filter circuit are arranged in the non-hollowed-out areas of the PCB board; The overall height of the PCB circuit board is not higher than the height of the highest inductor.

11. An ultra-thin filter, comprising a PCB board and inductors, capacitors and components of an active filter circuit assembled thereon, characterized in that: The PCB board is provided with 5 hollowed-out areas, and terminal holes are provided around the hollowed-out areas. The inductors and capacitors are fixedly installed on the PCB board through the terminal holes; There are 4 inductors, which are respectively placed in 4 hollowed-out areas; There are 2 capacitors. The capacitor bodies lie flat in pairs and are close to each other on the side, and are assembled and placed in 1 hollowed-out area; The components of the active filter circuit are arranged in the non-hollowed-out areas of the PCB board.

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