Filter circuit, PCB assembly, filter and electronic equipment

Abstract

The utility model discloses a filter circuit, a PCB assembly, a filter and an electronic device, and the filter circuit comprises a first capacitor circuit and a second capacitor circuit. The first end of the first capacitive circuit is used for being connected with a positive bus, the second end of the first capacitive circuit is used for being connected with a negative bus, the first capacitive circuit comprises at least two capacitors arranged in parallel, and the second end of the second capacitive circuit is used for being connected with the negative bus. The second end of the second capacitive circuit is used for being connected with a ground wire, and the second capacitive circuit comprises at least two capacitors which are arranged in parallel. According to the technical scheme, electromagnetic interference can be suppressed, meanwhile, the capacitance value presented by the first capacitance circuit and the capacitance value presented by the second capacitance circuit can be finely adjusted, the optimal capacitance configuration mode of the first capacitance circuit and the optimal capacitance configuration mode of the second capacitance circuit are selected, and the filtering effect and cost are flexibly adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering, in particular to a filtering circuit, a PCB assembly, a filter and an electronic device. Background Art

[0002] With the rapid development of technology, electronic devices have penetrated into all aspects of our lives. The stable and reliable operation of electronic devices depends on the precise control of each circuit module in the electronic device by the controller in the electronic device. However, during the operation of the controller, problems such as voltage fluctuations and electromagnetic interference often occur, thus having a great impact on the stable and reliable operation of the electronic device. Summary of the Utility Model

[0003] Embodiments of the utility model provide a filtering circuit, a PCB assembly, a filter and an electronic device to solve the problem that the controller in the existing electronic device is easily affected by electromagnetic interference.

[0004] A filtering circuit includes a first capacitor circuit and a second capacitor circuit;

[0005] The first end of the first capacitor circuit is used to connect to the positive bus, the second end of the first capacitor circuit is used to connect to the negative bus, and the first capacitor circuit includes at least two capacitors connected in parallel.

[0006] The first end of the second capacitor circuit is used to connect to the negative bus DC-, the second end of the second capacitor circuit is used to connect to the ground wire, and the second capacitor circuit includes at least two capacitors connected in parallel.

[0007] Further, the filtering circuit further includes a discharge circuit connected in parallel with the second capacitor circuit.

[0008] Further, the discharge circuit includes a discharge resistor.

[0009] A PCB assembly includes a PCB board and the above-mentioned filtering circuit;

[0010] The PCB board is provided with the positive bus, the negative bus and the ground wire;

[0011] The filtering circuit is arranged on the PCB board and is connected to the positive bus, the negative bus and the ground wire.

[0012] Further, at least two of the above-mentioned filtering circuits are provided on the PCB board;

[0013] The PCB board includes a first area and at least two second areas arranged outside the first area;

[0014] At least two of the filtering circuits are disposed within the first region.

[0015] Further, each of the second regions is provided with a first connection end for connecting to the positive bus, a second connection end for connecting to the negative bus, and a third connection end for connecting to the ground wire.

[0016] A filter, comprising a housing and the above-mentioned PCB assembly; the PCB assembly is disposed within the housing.

[0017] Further, the housing includes a first housing and a second housing;

[0018] The first housing and the second housing cooperate to form a receiving cavity; the PCB assembly is disposed within the receiving cavity;

[0019] The side surface of the second housing is provided with a wire passing hole; the wire passing hole is for a transmission line to pass through; the transmission line is for connecting to the filtering circuit on the PCB assembly.

[0020] Further, the PCB board of the PCB assembly is connected to the second housing through a shock absorption assembly.

[0021] Further, the shock absorption assembly includes shock absorption gaskets.

[0022] An electronic device, comprising at least two controllers and the above-mentioned filter;

[0023] Each of the controllers is connected to a power supply terminal through a positive bus connection end and a negative bus connection end of the filter.

[0024] For the above-mentioned filtering circuit, PCB assembly, filter and electronic device, the filtering circuit includes a first capacitor circuit and a second capacitor circuit; by using the first end of the first capacitor circuit to connect to the positive bus, the second end of the first capacitor circuit to connect to the negative bus, the second end of the second capacitor circuit to connect to the negative bus, and the second end of the second capacitor circuit to connect to the ground wire, and ensuring that the first capacitor circuit includes at least two capacitors connected in parallel, and ensuring that the second capacitor circuit includes at least two capacitors connected in parallel, electromagnetic interference can be suppressed, and at the same time, it is convenient to finely adjust the capacitance values presented by the first capacitor circuit and the second capacitor circuit, so as to select the optimal capacitance configuration modes of the first capacitor circuit and the second capacitor circuit, and flexibly adjust the filtering effect and cost. Description of the Drawings

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 is a circuit schematic diagram of a filter circuit in an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of a PCB assembly in an embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of a filter in an embodiment of the present invention;

[0029] Figure 4 is another schematic diagram of a filter in an embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of a first housing in an embodiment of the present invention;

[0031] Figure 6 is a schematic diagram of a filter in an embodiment of the present invention;

[0032] Figure 7 is a schematic diagram of an electronic device in an embodiment of the present invention.

[0033] In the figure: 1. Filter; 11. Housing; 1a. First housing; 1b. Second housing; 1c. Wiring hole; 1d. Guide structure; 12. PCB assembly; 121. PCB board; 12a. First area; 12b. At least two second areas; 12c. First connection end; 12d. Second connection end; 12e. Third connection end; 122. Filter circuit; 1221. First capacitor circuit; 1222. Second capacitor circuit; 1223. Bleeder circuit; 13. Shock absorption assembly; 131. Bushing; 132. Vibration damping gasket; 133. Bolt; 2. At least two controllers; 3. Power supply terminal; Detailed implementation manners

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0035] It should be understood that the present utility model can be implemented in different forms and should not be construed as limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the present utility model to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals throughout the drawings denote the same elements.

[0036] It should be understood that when an element or layer is referred to as being "on", "adjacent to", "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected or coupled to the other element or layer, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on", "directly adjacent to", "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Thus, the first element, component, region, layer or part discussed below may be denoted as the second element, component, region, layer or part without departing from the teachings of the present utility model.

[0037] Spatial relationship terms such as "under", "below", "lower", "beneath", "above", "upper", etc. may be used herein for convenience in describing the relationship of one element or feature to another element or feature shown in the figures. It should be understood that, in addition to the orientation shown in the figures, the spatial relationship terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, then an element or feature described as "under" or "beneath" or "below" another element or feature will be oriented as "above" the other element or feature. Thus, the exemplary terms "under" and "below" can include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are to be interpreted accordingly.

[0038] The purpose of the terms used herein is only to describe specific embodiments and is not a limitation of the present utility model. When used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, identify the presence of the stated features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups. When used herein, the term "and / or" includes any and all combinations of the related listed items.

[0039] To thoroughly understand the present utility model, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present utility model. The preferred embodiments of the present utility model are described in detail below. However, in addition to these detailed descriptions, the present utility model may also have other embodiments.

[0040] This embodiment provides a filter circuit 122, which is applied to an electronic device. Preferably, the electronic device is an electronic device including at least two controllers 2. Preferably, the electronic device is a multi-rotor aircraft. In the related art, a multi-rotor aircraft includes a rotor system, which includes a plurality of rotors symmetrically arranged around the multi-rotor aircraft, such as quad-rotor, hex-rotor, and octo-rotor, etc. An upper motor, a lower motor, and corresponding propellers are installed on each single axis of the rotor system. The upper motor and the lower motor are respectively controlled by a motor controller. Therefore, in the rotor system, a relatively high control precision is required for the motor controller. Therefore, in order to improve the control precision of the motor controller, this filter circuit 122 is added between the motor controller and the power battery to suppress the ripples and noises caused by the fluctuations of the power battery before entering the motor controller, so as to avoid the motor controller being affected by electromagnetic interference, improve the control precision of the motor controller, and thus improve the stability of the multi-rotor aircraft. It should be noted that in other electronic devices including at least two controllers 2, there are similar problems. By connecting the filter circuit 122 to at least two controllers 2 and the power supply terminal 3 corresponding to each controller, this embodiment can suppress the electromagnetic interference caused by the unstable power supply voltage output by the power supply terminal 3 and improve the control precision of the controller. Exemplarily, the power supply terminal 3 is used to connect to a power battery or other power supply.

[0041] This embodiment provides a filter circuit 122, which includes a first capacitor circuit 1221 and a second capacitor circuit 1222; the first end of the first capacitor circuit 1221 is used to connect to the positive bus DC+, the second end of the first capacitor circuit 1221 is used to connect to the negative bus DC-, and the first capacitor circuit 1221 includes at least two capacitors connected in parallel, such as Figure 1 andFigure 2 C1 and C2 in it. The first end of the second capacitor circuit 1222 is used to connect to the negative bus DC-, and the second end of the second capacitor circuit 1222 is used to connect to the ground wire BODY_GND. The second capacitor circuit 1222 includes at least two capacitors connected in parallel, such as Figure 1 and Figure 2 C3 and C4 in it.

[0042] Wherein, the positive bus DC+ and the negative bus DC- are respectively used to connect the positive and negative poles of the power supply end 3 and the positive and negative poles of the load device. The power supply end 3 is used to connect to a power supply, such as a power battery. The load device is, for example, the controller in the above embodiment. The ground wire BODY_GND is used to connect to the grounding end.

[0043] As an example, when the power supply supplies power to the controller through the power supply end 3, since the first end of the first capacitor circuit 1221 is used to connect to the positive bus DC+, the second end of the first capacitor circuit 1221 is used to connect to the negative bus DC-, the second end of the second capacitor circuit 1222 is used to connect to the negative bus DC-, and the second end of the second capacitor circuit 1222 is used to connect to the ground wire BODY_GND. Therefore, a filtering path corresponding to the positive bus DC+ is formed through the first capacitor circuit 1221, the second capacitor circuit 1222, and the ground wire BODY_GND, and a filtering path corresponding to the negative bus DC- is formed through the second capacitor circuit 1222 and the ground wire BODY_GND. Thus, when the power supply supplies power to the controller, filtering is performed through the filtering path corresponding to the positive bus DC+ and the filtering path corresponding to the negative bus DC-, eliminating the electromagnetic interference brought by the power supply, and further improving the control accuracy of the controller. It should be noted that the first capacitor circuit 1221 includes at least two capacitors connected in parallel, which is convenient for fine-tuning the capacitance value presented by the first capacitor circuit 1221. The second capacitor circuit 1222 includes at least two capacitors connected in parallel, which is convenient for fine-tuning the capacitance value presented by the second capacitor circuit 1222, so as to facilitate the selection of the optimal capacitance configuration modes of the first capacitor circuit 1221 and the second capacitor circuit 1222, and flexibly adjust the filtering effect and cost.

[0044] In this embodiment, the filter circuit 122 includes a first capacitor circuit 1221 and a second capacitor circuit 1222. By connecting the first end of the first capacitor circuit 1221 to the positive bus DC+, the second end of the first capacitor circuit 1221 to the negative bus DC-, the second end of the second capacitor circuit 1222 to the negative bus DC-, and the second end of the second capacitor circuit 1222 to the ground wire BODY_GND, and ensuring that the first capacitor circuit 1221 includes at least two capacitors connected in parallel and the second capacitor circuit 1222 includes at least two capacitors connected in parallel, electromagnetic interference can be suppressed, and at the same time, it is convenient to finely adjust the capacitance values presented by the first capacitor circuit 1221 and the second capacitor circuit 1222, so as to select the optimal capacitance configuration modes of the first capacitor circuit 1221 and the second capacitor circuit 1222, and flexibly adjust the filtering effect and cost.

[0045] In one embodiment, the filter circuit 122 further includes a discharge circuit 1223 connected in parallel with the second capacitor circuit 1222.

[0046] Wherein, the discharge circuit 1223 is used to discharge the energy stored in the second capacitor circuit 1222 when the second capacitor circuit 1222 is in a static or non-operating state, avoid the safety hazards caused by the charged electronic device housing, and improve the safety and reliability during the use of the electronic device.

[0047] As an example, the implementation manner of the discharge circuit 1223 includes resistor discharge, diode discharge, or transistor discharge, etc.

[0048] Preferably, the discharge circuit 1223 adopts resistor discharge. For example, the discharge circuit 1223 includes a discharge resistor R1, as shown in Figure 1 and Figure 2 The discharge resistor is connected in parallel with the second capacitor circuit 1222, so as to discharge the charge of the second capacitor circuit 1222 to the ground. By configuring the resistance value of the discharge resistor, the discharge speed of the charge can be easily controlled.

[0049] Optionally, the discharge circuit 1223 can also adopt diode discharge. For example, a diode is connected in parallel with the second capacitor circuit 1222. When the voltage of the second capacitor circuit 1222 is greater than the conduction voltage of the diode, the charge of the second capacitor circuit 1222 can be discharged to the ground. However, compared with the discharge resistor, the discharge speed cannot be controlled, and a large instantaneous current is easily generated.

[0050] Optionally, the discharge circuit 1223 can also use a transistor for discharging. The transistor can be an NPN or PNP transistor. By inputting a control signal to the transistor, the transistor can be controlled to conduct, ensuring that when the transistor conducts, a discharge path can be formed between the second capacitor circuit 1222 and the ground, so that the charge of the second capacitor circuit 1222 can be discharged to the ground. However, compared with the discharge resistor, the discharge speed circuit cannot be controlled, and the design is relatively complex.

[0051] This embodiment provides a PCB assembly 12, as Figure 2 shown, including a PCB board 121 and the above-mentioned filtering circuit 122; the positive bus bar DC+, the negative bus bar DC−, and the ground wire BODY_GND are provided on the PCB board 121; the filtering circuit 122 is disposed on the PCB board 121 and is connected to the positive bus bar DC+, the negative bus bar DC−, and the ground wire BODY_GND.

[0052] In this embodiment, the filtering circuit 122 is disposed on the PCB board 121 and is connected to the positive bus bar DC+, the negative bus bar DC−, and the ground wire BODY_GND, which is convenient for integrating the filtering circuit 122 and improving the integration degree of the filtering circuit 122.

[0053] In one embodiment, at least two filtering circuits 122 are provided on the PCB board 121; the PCB board 121 includes a first area 12a and at least two second areas 12b disposed outside the first area 12a; at least two filtering circuits 122 are disposed in the first area 12a.

[0054] As an example, two filtering circuits 122 are provided on the PCB board 121, and each filtering circuit 122 is used to filter a controller.

[0055] As an example, the PCB board 121 includes a first area 12a and two second areas 12b, and the first area 12a is disposed between the two second areas; at least two filtering circuits 122 are disposed in the first area 12a, so that a single PCB board 121 can filter two controllers, making the electronic device more lightweight.

[0056] Optionally, each filtering circuit 122 is connected to a first connection terminal 12c, a second connection terminal 12d, and a third connection terminal 12e. The first connection terminal 12c is used to connect to the positive bus bar DC+, the second connection terminal 12d is used to connect to the negative bus bar DC−, and the third connection terminal 12e is used to connect to the ground wire BODY_GND. Each controller and the power supply terminal 3 corresponding to each controller are connected to the first connection terminal 12c and the second connection terminal 12d through transmission lines.

[0057] The positions of the first connection terminal 12c, the second connection terminal 12d, and the third connection terminal 12e on the PCB board 121 can be set according to actual requirements.

[0058] Preferably, each of the second regions is provided with a first connection terminal 12c for connecting to the positive bus DC+, a second connection terminal 12d for connecting to the negative bus DC−, and a third connection terminal 12e for connecting to the ground wire BODY_GND, facilitating the routing of transmission lines between each filter circuit 122 on the PCB board 121 and each controller and the power supply terminal 3 corresponding to each controller.

[0059] This embodiment provides a filter 1, as Figures 3 - 6 shown, including a housing 11 and the above-mentioned PCB assembly 12; the PCB assembly 12 is disposed within the housing 11.

[0060] In this embodiment, the filter 1 includes a housing 11 and the above-mentioned PCB assembly 12; the PCB assembly 12 is disposed within the housing 11. Since at least two filter circuits 122 are provided on the PCB assembly 12, when the filter 1 is applied to an electronic device, one filter 1 can filter at least two controllers 2, improving the integration of the electronic device and making the electronic device lighter.

[0061] In one embodiment, the housing 11 includes a first housing 1a and a second housing 1b; the first housing 1a and the second housing 1b cooperate to form a receiving cavity; the PCB assembly 12 is disposed within the receiving cavity; a wire passing hole 1c is provided on the side of the second housing 1b; the wire passing hole 1c is for a transmission line to pass through; the transmission line is for connecting to the filter circuit 122 on the PCB assembly 12.

[0062] As an example, the housing 11 includes a first housing 1a and a second housing 1b; the first housing 1a and the second housing 1b cooperate to form a receiving cavity. Optionally, the first housing 1a and the second housing 1b can be connected by bolts 13 or interference fit. Preferably, the first housing 1a and the second housing 1b can be connected by bolts 13 to improve firmness. Optionally, a guiding structure 1d is provided on the first housing 1a, and the guiding structure 1d is for achieving quick positioning during the installation of the housing 11, facilitating installation.

[0063] As an example, a wire passing hole 1c is provided on the side of the second housing 1b. The number of the wire passing holes 1c corresponds to the number of the filter circuits 122 on the PCB board 121 one by one, and the first connection end 12c, the second connection end 12d, and the third connection end 12e corresponding to each filter circuit 122 are oppositely arranged. For example, it is oppositely arranged with the second region in the above embodiment, so as to facilitate the routing of the transmission line between each filter circuit 122 on the PCB board 121 and each controller and the power supply terminal 3 corresponding to each controller. Preferably, the wire passing hole 1c is an oblong hole to facilitate the passing of the transmission line.

[0064] In one embodiment, the PCB board 121 of the PCB assembly 12 is connected to the second housing 1b through a shock absorption assembly 13.

[0065] In this embodiment, the PCB board 121 of the PCB assembly 12 is connected to the second housing 1b through a shock absorption assembly 13. Through the shock absorption effect of the shock absorption assembly 13, the firmness of the capacitors in the filter circuit 122 on the welded PCB board 121 is improved.

[0066] As an example, the PCB board 121 is rectangular, and four bosses are provided at the bottom of the second housing 1b, corresponding to the four vertices of the PCB board 121. Each boss is connected to the PCB through a shock absorption assembly 13. Exemplarily, the shock absorption assembly 13 includes a bushing 131, a shock absorption gasket 132, and a bolt 13. Through the cooperation among the bushing 131, the shock absorption gasket 132, and the bolt 13, the PCB board 121 is fixed on the four bosses provided at the bottom of the second housing 1b, so as to play a role in fixing and shock absorption.

[0067] Optionally, the shock absorption assembly 13 may also include a shock absorption gasket, and both sides of the shock absorption gasket are connected to the PCB board 121 and the boss through glue respectively, so as to play a role in fixing and shock absorption.

[0068] This embodiment provides an electronic device, such as Figure 7 shown, including at least two controllers 2 and the above-mentioned filter 1; each of the controllers is connected to a power supply terminal 3 through a positive bus DC+ connection end and a negative bus DC- connection end of the filter 1.

[0069] Among them, at least two controllers 2 include Figure 7Among the MCU1 and MCU2, the power supply terminal 3 includes PDU1 and PDU2. Among them, PDU1 M01- and PDU1 M01+ are the negative connection terminal and the positive connection terminal of PDU1. PDU2 M02- and PDU2 M02+ are the negative connection terminal and the positive connection terminal of PDU2. MCU1 M01- and MCU1 M01+ are the negative connection terminal and the positive connection terminal of MCU1. MCU2 M02- and MCU2 M02+ are the negative connection terminal and the positive connection terminal of MCU2. HV+ is the first connection terminal 12c on the PCB component 12, HV- is the second connection terminal 12d on the PCB component 12, and GND_M01 and GND_M02 are the third connection terminals 12e corresponding to MCU1 and MCU2 on the PCB board 121 respectively.

[0070] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A filter circuit, characterized in that: including a first capacitance circuit and a second capacitance circuit; The first end of the first capacitor circuit is used to connect to the positive bus, the second end of the first capacitor circuit is used to connect to the negative bus, and the first capacitor circuit includes at least two capacitors arranged in parallel. The first end of the second capacitor circuit is used to connect to the negative busbar, the second end of the second capacitor circuit is used to connect to the ground line, and the second capacitor circuit includes at least two capacitors arranged in parallel.

2. The filter circuit according to claim 1, characterized in that: The filter circuit further includes a discharge circuit connected in parallel with the second capacitor circuit.

3. The filter circuit according to claim 2, characterized in that: The discharge circuit includes a discharge resistor.

4. A PCB assembly, characterized in that: Comprising a PCB board and the filter circuit according to any one of claims 1 to 3; The positive bus bar, the negative bus bar and the ground wire are arranged on the PCB board; The filter circuit is arranged on the PCB board and is connected to the positive bus bar, the negative bus bar and the ground wire.

5. The PCB assembly according to claim 4, characterized in that: At least two of the filter circuits are provided on the PCB board; The PCB board includes a first area and at least two second areas arranged around the first area; At least two of the filter circuits are arranged in the first area.

6. The PCB assembly according to claim 5, characterized in that: Each of the second regions is provided with a first connection end for connecting to the positive bus bar, a second connection end for connecting to the negative bus bar, and a third connection end for connecting to the ground line.

7. A filter, characterized in that: It comprises a housing and a PCB assembly as claimed in any one of claims 4 to 6; the PCB assembly is arranged in the housing.

8. The filter according to claim 7, characterized in that The housing comprises a first housing and a second housing; The first shell and the second shell cooperate to form a containing cavity; the PCB assembly is arranged in the containing cavity; A wire hole is provided on the side of the second shell; the wire hole is used for the transmission line to pass through; the transmission line is used to connect to the filter circuit on the PCB assembly.

9. The filter according to claim 8, characterized in that The PCB board of the PCB assembly is connected to the second shell through a shock absorbing assembly.

10. The filter according to claim 9, characterized in that The shock absorbing assembly includes a shock absorbing gasket.

11. An electronic device, characterized in that: comprising at least two controllers and a filter as claimed in any one of claims 7 to 10; Each of the controllers is connected to a power supply terminal through a positive bus connection terminal and a negative bus connection terminal of the filter.

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