Electronic device and power module thereof

An electronic device and a power module are provided. The power module includes a power housing; a circuit board, connected to the power housing and arranged with a plurality of pads on a surface of the circuit board facing the power housing; an electronic component, arranged on the circuit board and comprising a plurality of pins; wherein the plurality of pins are soldered and connected to the plurality of pads; and a first sealant layer, arranged on the surface of the circuit board facing the power housing, and covering the plurality of pins and the plurality of pads.

CROSS REFERENCE

The present application claims foreign priority of Chinese Patent Applications No. 201922499927.5, filed on Dec. 31, 2019 in the State Intellectual Property Office of China, the entire contents of which are hereby incorporated by reference.

TECHNICAL FIELD

The present disclosure relates to the field of electronic devices, in particular to an electronic device and a power module thereof.

BACKGROUND

With the widespread application of electronic devices, the number of electronic components arranged on a circuit board in a power module is increasing. Pins of the electronic components are usually soldered on the circuit board. As the use time of the electronic devices is prolonged, the electrical connection between the pins of the electronic component and pads on the circuit board is likely to fail, which may cause damage to the electronic devices.

SUMMARY OF THE DISCLOSURE

The present disclosure provides a power module including: a power housing; a circuit board, connected to the power housing and arranged with a plurality of pads on a surface of the circuit board facing the power housing; an electronic component, arranged on the circuit board and including a plurality of pins; wherein the plurality of pins are soldered and connected to the plurality of pads; and a first sealant layer, arranged on the surface of the circuit board facing the power housing, and covering the plurality of pins and the plurality of pads.

The present disclosure further provides an electronic device, including a power module as described above.

DETAILED DESCRIPTION

To make any one of skill in the art to understand the technical solutions of the present disclosure, the technical solutions provided by the present disclosure will be described in details by referring to the drawings and the embodiments. Obviously, the described embodiments are only a part of the embodiments, but not all the embodiments of the present disclosure. Based on the described embodiments, all other embodiments obtained by one skilled in the art without creative efforts shall fall within the scope of the present disclosure.

Terms of “first”, “second”, and “third” in the present disclosure are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first”, “second”, and “third” may explicitly or implicitly include at least one of the features. In the description of the present disclosure, “a plurality of” means at least two, such as two, three, etc., unless otherwise specifically defined. All directional indications (such as up, down, left, right, front, back . . . ) in the embodiments of the present disclosure are only for explaining a relative positional relationship, movement, etc. between the components in a specific posture (as shown in the drawings). When the specific posture changes, the directional indication will change accordingly. In addition, terms of “including” and “having” and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes other steps or units inherent in the process, method, product or device.

Reference to “embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present disclosure. The appearances of this term in various places in the specification are not necessarily all referring to the same embodiment, nor are they independent or alternative embodiments that are mutually exclusive with other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

As shown inFIGS. 1 and 2,FIG. 1is a perspective-structural schematic view of a power module according to an embodiment of the present disclosure, andFIG. 2is an exploded-structural schematic view of the power module shown in the embodiment ofFIG. 1. The present disclosure provides a power module10, which is usually applied in an electronic device to supply power to the electronic device.

The power module10includes a power housing12, a circuit board14, an electronic component16and a first sealant layer18. The circuit board14is connected to the power housing12. A plurality of pads are arranged on a surface of the circuit board14facing the power housing12. The electronic component16is arranged on the circuit board14and includes pins. The pins are soldered and electrically connected to the plurality of pads. The first sealant layer18is arranged on the surface of the circuit board14facing the power housing12and covers the pins and the plurality of pads.

A match relationship of one pin and one pad may be shown inFIGS. 5 and 6,FIG. 5is an enlarged section-structural schematic view of a matching structure of a pin and a pad according to an embodiment of the present disclosure.FIG. 6is an enlarged bottom structural schematic view of a matching structure of a pin and a pad according to an embodiment of the present disclosure. For ease of illustration, the first sealant layer18as well as some other elements are omitted. A pin161is one of the plurality of pins in the embodiments of the present disclosure. A pad141is one of the plurality of pads in the embodiments of the present disclosure. It can be understood that the thickness of the pad141may be very small compared with that of the circuit board14. The shape of the pad141and the pin161may be set according to needs, which is not limited herein.

In the embodiments of the present disclosure, the plurality of pads are arranged on the surface of the circuit board14facing the power housing12, such that soldering positions of the pins and the pads of the electronic component16are located between the circuit board14and the power housing12. In this way, the electronic components16arranged on the circuit board14may not interfere with the connection between the pins and the pads. The first sealant layer18is covered at the connection positions of the pins and the pads. The layer18may fix the pins and the pads, such that the pins may not loosen to the pads and ensure a success connection. The first sealant layer18may also be moisture-proof, such that the pins or pads may not corrode. The first sealant layer18may also be insect-proof, such that small-sized insects may not enter the power housing12and the pins or pads are to be protected, thereby ensuring the success connection between the electronic component16and the circuit board14. In this way, a solder stability between the pins of the electronic component16and the pads on the board14is enhanced, improving an electrical connection stability between the pins of the electronic component16and the pads on the circuit board14.

In the embodiments, the circuit board14may usually be configured as a rigid circuit board to support the electronic component16. Or, in other embodiments, the circuit board14may also be a flexible-hard combination board, etc., which is not specifically limited herein

In some embodiments, as shown inFIG. 2, the electronic component16may include an integrated chip162, a capacitor164and a resistor166. The circuit board14is arranged with conductive lines (not shown). The integrated chip162is connected to the capacitor164and the resistor166through the conductive lines. The first sealant layer18covers the conductive lines.

Specifically, the conductive lines may be prepared by etching a metal layer on the circuit board14. Specific forming methods thereof may be referred to the prior art, which is not specifically limited herein. The electronic component16such as the integrated chip162, the capacitor164and the resistor166may be arranged on the circuit board14. The pins of the electronic component16are electrically connected with the conductive lines to form an integrated circuit such as power-supply integrated circuit and filtering integrated circuit, which is not limited herein. The first sealant layer18is arranged to cover the conductive lines, such that the conductive lines may not be rusted and disconnected or damaged by insects due to the protective effect of the first sealant layer18on the conductive lines, thereby prolonging the service life of the circuit board14. In addition, the first sealant layer18may also insulate the conductive circuit from external circuits, such that the conductive circuit may not be connected to other circuits causing short circuits.

Further, as shown inFIGS. 2 and 3,FIG. 3is a section-structural schematic view of the power module shown in the embodiment ofFIG. 1. The power module10further includes a heat dissipation assembly11in contact with the integrated chip162for dissipating heat for the integrated chip162.

Specifically, as shown inFIGS. 2 and 3, the heat dissipation assembly11is connected to the circuit board14, and the integrated chip162is sandwiched in a gap between the circuit board14and the heat dissipation assembly11to dissipate heat for the integrated chip162.

Since the integrated chip162generates a large amount of heat during operation, the temperature of the integrated chip162may increase due to the heat. The increase in the temperature of the integrated chip162will reduce the operating speed of the electronic device. When the temperature is high enough, the integrated chip162may be burned out. Therefore, in the embodiments of the present disclosure, the heat dissipation assembly11for dissipating heat for the integrated chip162is arranged on the circuit board14to improve the heat dissipation performance of the integrated chip162, thereby protecting the integrated chip162from damages to the electronic device.

The heat dissipation assembly11may include a plurality of heat dissipation fins. The plurality of heat dissipation fins are arranged in parallel and spaced apart to form a heat dissipation channel between adjacent heat dissipation fins, thereby increasing the heat dissipation rate of the integrated chip162.

Of course, in other embodiments, the heat dissipation assembly11may also include a liquid-cooled radiator or a fan for heat dissipation, which is not specifically limited herein.

Further, as shown inFIG. 3, the first sealant layer18may be a thermal conductive glue and be connected to the power housing12and the circuit board14respectively, such that a heat conduction of the power housing12and the circuit board14is achieved via the first sealant layer18.

Specifically, an end of the first sealant layer18is connected to the power housing12, and the other end of the first sealant layer18is connected to the circuit board14, thereby thermally connecting the power housing12and the circuit board14. Since the heat conduction efficiency of the thermal conductive glue is higher than that of air, the thermal conductive glue is sandwiched between the power housing12and the circuit board14to facilitate the transfer of heat on the circuit board14to the power housing12with a larger surface area. In this way, the power housing12may be configured to perform the heat dissipation for the circuit board14, thereby improving the heat dissipation performance of the power module10.

In some embodiments, the first sealant layer18may be arranged partially corresponding to the positions of the pads and pins. The first sealant layer18may also be evenly filled in the gap between the power housing12and the circuit board14. In this way, a contact area between the thermal conductive glue and the circuit board14and the power housing12may be increased, further improving the heat dissipation performance of the power supply module10.

Furthermore, as shown inFIG. 3, the power module10may further include a second sealant layer13covering a surface of the circuit board14facing away from the power housing12.

Specifically, the second sealant layer13is arranged on the surface of the circuit board14facing away from the power housing12. The second sealant layer13defines a vacancy at a position corresponding to the electronic component16to facilitate an electrical connection between the electronic component16and the circuit board14.

In some embodiments, the first sealant layer18is coated on the surface of the circuit board14with a uniform thickness, such that dust and other debris may not fall into the gap between the electronic components16, thereby improving a dustproof effect of the power module10.

Further, as shown inFIG. 3andFIG. 4,FIG. 4is a partial-enlarged schematic view of the structure shown inFIG. 3. The circuit board14may define at least one through hole142. The pins may pass through the through hole142and be soldered to the pads.

Specifically, the circuit board14defines the through hole142for shunning the pins. By defining the through holes142for shunning the pins on the circuit board14, the length of the wiring between the pins and the pads may be reduced, thereby reducing a signal transmission loss and improving the performance of the power module10.

Further, the power module10may further include a third sealant layer17sandwiched between the pins and an inner wall of the through hole142. The third sealant layer17is sandwiched between the pins and the inner wall of the through hole142, such that the pins may not shake relative to the circuit board14due to a fixing function of the third sealant layer17to the pins. In this way, a stability of electrical connection with the pins and pads are improved.

In the embodiments, as shown inFIG. 4, the first sealant layer18, the second sealant layer13, and the third sealant layer17may be integrally formed. With the above solution, a production process of the power module10may be simplified to improve a production efficiency of the power module10. For example, a glue potting process may be applied. A molten thermally conductive glue may be poured into the inside of the power housing12from a glue hole. The molten thermally conductive glue will form the integrated first sealant layer18, second sealant layer13and third sealant layer17after cooling.

Of course, in other embodiments, the first sealant layer18, the second sealant layer13, and the third sealant layer17may also be integrally formed by other processing methods, which are not specifically limited herein.

In some embodiments, the first sealant layer18is at least one of gray glue, white glue, and epoxy resin. For example, in the embodiments, the first sealant layer18may be a mixture of gray glue and white glue. Specifically, the first sealant layer18may include 50% gray glue and 50% white glue. In other embodiments, the first sealant layer18may also be epoxy resin, etc., which is not specifically limited in the embodiments of the present disclosure, and may be flexibly configured according to needs.

In another embodiment of the present disclosure, an electronic device is also provided. The electronic device includes a power module.

The structure of the power module in the embodiment is the same as the structure of the power module in the foregoing embodiments, which may be referred to the description in the foregoing embodiments and will not be repeated here.

In some embodiments, the electronic device may be a desktop computer host, a television, a refrigerator, a washing machine, and other electrical appliances, which are not specifically limited herein.

In summary, those skilled in the art can easily understand that by arranging the plurality of pads on the surface of the circuit board14facing the power housing12, the pins of the electronic component16and the pads may be soldered between the circuit board14and the power housing12, such that the electronic component16arranged on the circuit board14may not interfere with the connection between the pins and the pads. The first sealant layer18is coveringly arranged at the connection position of the pins and the pads. The first sealant layer18may fix the pins and the pads, such that the pins may not loosen relative to the pads causing the connection failure. The first sealant layer18may also be moisture-proof, such that the pins or pads may not corrode. The first sealant layer18may also be insect-proof, such that small-sized insects may not enter the power housing12and the pins or pads are to be protected, thereby ensuring the success connection between the electronic component16and the circuit board14. In this way, a solder stability between the pins of the electronic component16and the pads on the board14is enhanced, improving an electrical connection stability between the pins of the electronic component16and the pads on the circuit board14.

The above description is for the purpose of illustrating implementations of the present disclosure, but not to limit the scope of the present disclosure. Any equivalent structural or process transformation performed based on the drawings and the specification of the present disclosure, applied directly and indirectly in other related art, should be within the scope of the present disclosure.