CN218771743U - Power adapter for direct current electric tool - Google Patents

Abstract

The utility model discloses a power adapter for a DC electric tool, which comprises a housing, a power conversion circuit board fixed in the housing, a power plug wire electrically connected with the power conversion circuit board is arranged on the housing, and the housing includes a The bottom case and the front case are fixed, the side wall of the bottom case is fixed with a heat dissipation strip groove, and at least one heat dissipation fan is fixed inside the side wall of the bottom case, and the power conversion circuit board includes a power input terminal, a rectification filter circuit, a high-power DC The conversion circuit and the 20V voltage output terminal are also provided with a switching power supply circuit connected with the rectification and filtering circuit and an optocoupler driving circuit connected with the control terminal of the switching power supply circuit. The structure of the utility model is reasonable, and the conversion of the power conversion circuit board can meet the power supply requirements of DC electric tools, which is conducive to improving the continuity of power supply, and has a cooling fan, which is beneficial to improving the overall heat dissipation performance, realizing over-temperature protection, and improving the overall performance. Long service life, strong applicability and good practicability.

Description

A kind of power adapter for DC electric tool

technical field

The utility model belongs to the technical field of DC electric tools, in particular to a power adapter for DC electric tools.

Background technique

Power tool adapters currently on the market are usually equipped with a battery pack to supply power to the power tool through the battery pack. The battery pack is provided with a plug-in interface, which is directly electrically connected to the interface of the machine tool. Generally, each power tool has a corresponding There is a type of battery pack, which cannot be used universally. Chinese patent CN202221399029.8 discloses a battery pack interface conversion adapter, which is mainly provided with a mounting port for installing a battery pack in the casing, and a mounting port for different batteries is provided in the mounting port. A variety of interface conversion structures for packet connection, which can be converted according to needs through a variety of interface conversion structures, so as to meet the needs of different interfaces and help improve its scope of application. However, the above-mentioned structure is powered by a built-in battery pack, and its battery The capacity of the bag can only work for a relatively short time. When the battery is exhausted, the tool will not work normally, affecting normal work. At the same time, its overall heat dissipation performance is relatively limited, which will also affect the service life, applicability and practicality of the overall structure. Sex is restricted.

Contents of the invention

The purpose of the utility model is to provide a power adapter for a DC electric tool with a reasonable structure and arrangement and is conducive to improving the continuity of power supply.

The technical solution to achieve the purpose of the utility model is a power adapter for DC electric tools, including a housing, and a power conversion circuit board fixed in the housing, and the housing is provided with a power adapter electrically connected to the power conversion circuit board. The power cord, the housing includes a bottom shell and a surface shell fixed by screws, a heat dissipation strip groove is fixed on the side wall of the bottom shell, and at least one heat dissipation fan is fixed inside the side wall of the bottom shell, The cooling fan is electrically connected to the control terminal of the power conversion circuit board, and the power conversion circuit board includes a power input terminal, a rectification filter circuit electrically connected to the power input terminal, and an output terminal of the rectification filter circuit The connected high-power DC conversion circuit and the 20V voltage output terminal connected with the output end of the high-power DC conversion circuit are also provided with a switching power supply circuit connected with the rectification and filtering circuit and a control circuit with the switching power supply circuit An optocoupler driving circuit connected to terminals, the optocoupler driving circuit is connected to the 20V voltage output terminal, and the switching power supply circuit is connected to the control terminal of the high-power DC conversion circuit.

It is further preferred that: the top of the face shell is fixed with several conductive plug ports, and the inside of the face shell is fixed with a plug port contact piece connected to the 20V voltage output terminal on the power conversion circuit board. The number of plug terminal contacts is the same as the number of conductive plug ports, and the plug port contacts are located in the conductive plug ports.

Further preferably, two heat dissipation fins are fixed on the edge of the top surface of the power conversion circuit board, and the heat dissipation fan is attached to the end surface of the heat dissipation fins.

It is further preferred that there are two heat dissipation fans, and the two heat dissipation fans are arranged side by side inside the side wall of the bottom case, and the two heat dissipation fans are respectively attached to the end surface of a heat dissipation fin.

Further preferably, the model of the main chip of the switching power supply circuit is NCP1252.

It is further preferred that: the face shell is provided with an inspection opening, and a protective shell cover is buckled at the inspection opening.

It is further preferred that: both the bottom case and the front case are insulating plastic structural shells.

It is further preferred that: the edge of the bottom surface of the face shell is integrally formed with a limited pressure screw hole column, the surface shell and the bottom shell are combined and the space limit and pressure screw hole column abuts against the bottom wall of the bottom shell, so Said screw thread is fixed on the position-limiting and pressing screw hole column.

It is further preferred that: the side wall of the bottom case is provided with several locking slots, the edge of the front case is integrally formed with snap-in blocks with the same number as the number of the slots, the bottom case is connected with the front case and Preliminary positioning is performed by the buckle block and the slot.

The utility model has positive effects: the structure of the utility model is reasonable, and it is provided with a power conversion circuit board in the casing to replace the battery pack in the prior art, and is electrically connected through the power plug-in line, and the power conversion circuit board Conversion to meet the power supply requirements of DC electric tools is conducive to improving the continuity of power supply. At the same time, it is equipped with a cooling fan, which is conducive to improving the overall heat dissipation performance, realizing over-temperature protection, and is conducive to improving the overall service life. The use is stable and reliable, suitable for Strong and practical.

Description of drawings

In order to make the content of the utility model easier to understand clearly, the utility model will be further described in detail according to specific embodiments below in conjunction with the accompanying drawings, wherein:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the split structure schematic diagram of the present utility model;

Fig. 3 is a schematic diagram of a partially enlarged structure at A in Fig. 2;

FIG. 4 is a schematic diagram of a specific circuit structure of the present invention.

Reference signs: power conversion circuit board 1, shell 2, bottom shell 21, face shell 22, limit and pressure screw hole post 23, card slot 24, power plug-in line 3, heat dissipation strip groove 4, heat dissipation fan 5, Power input terminal 6, rectification and filtering circuit 7, high-power DC conversion circuit 8, 20V voltage output terminal 9, switching power supply circuit 10, optocoupler drive circuit 11, conductive plug port 12, plug port contact piece 13, heat dissipation fins 14. Inspection port 15, protective shell cover 16.

Detailed ways

(Example 1)

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figures 1 to 4, a power adapter for a DC electric tool includes a housing 2, a power conversion circuit board 1 fixed in the housing, and the housing is provided with a power conversion circuit board 1 Electrically connected power supply plug 3, in this embodiment, its power conversion circuit board includes a PCB board and specific electronic components on the PCB board.

The casing 2 includes a bottom casing 21 and a surface casing 22 fixed by screws. In this embodiment, the bottom casing and the surface casing are both insulating plastic structural casings. And in order to facilitate the installation of the screw rod, it is integrally formed on the edge of the bottom surface of the face shell with a limited pressure screw hole column 23, the surface shell and the bottom shell are combined, and the space-limited pressure screw hole column abuts against the bottom shell. On the bottom wall, the screw thread is fixed on the position-limiting and pressing screw hole post. Moreover, in the actual application process, the side wall of the bottom case is provided with a plurality of slots 24, and the edge of the surface case is integrally formed with snap blocks with the same number as the number of slots. The face shell is connected and preliminarily limited by the buckle block and the slot. When in use, the bottom case and the front case are first snapped to a limit, and then fixed by the screw to improve the position accuracy of its installation and ensure the reliability of the installation.

The side wall of the bottom case is fixed with a heat dissipation strip groove 4, and at least one heat dissipation fan 5 is fixed inside the side wall of the bottom case, and the heat dissipation fan is electrically connected with the control terminal of the power conversion circuit board. In the embodiment, in the actual application process, there are two heat dissipation fans and the two heat dissipation fans are arranged side by side inside the side wall of the bottom case, and the heat dissipation is performed by the two heat dissipation fans, which is conducive to improving the performance of heat dissipation and avoiding the occurrence of overheating conditions.

The power conversion circuit board 1 includes a power input terminal 6, a rectification and filtering circuit 7 electrically connected to the power input terminal, a high-power DC conversion circuit 8 connected to the output end of the rectification and filtering circuit, and a high-power DC conversion circuit 8 connected to the large power input terminal. The 20V voltage output terminal 9 connected to the output terminal of the power DC conversion circuit is also provided with a switching power supply circuit 10 connected to the rectification and filtering circuit and an optocoupler drive circuit 11 connected to the control terminal of the switching power supply circuit. In the embodiment, the model of the main chip of the switching power supply circuit is NCP1252. The optocoupler driving circuit is connected to the 20V voltage output terminal, and the switching power supply circuit is connected to the control terminal of the high-power DC conversion circuit. Its power input terminal is electrically connected with the power plug wire, and can input a voltage of 220-240V, and after passing through a high-power DC conversion circuit, the output voltage is 20V and the power supply is 2A, so as to meet the normal power supply requirements of DC electric tools and help improve Continuity and stability of use.

The top of the face shell is fixed with several conductive plug-in ports 12, and the inside of the face shell is fixed with a plug-in port contact piece 13 connected to the 20V voltage output terminal on the power conversion circuit board. The number of terminal contacts is the same as the number of conductive plug ports, and the plug port contacts are located in the conductive plug ports. In this embodiment, it is beneficial to improve the stability and reliability of the electrical connection, and also improves the effectiveness of plugging.

In practical application, in order to improve the overall heat dissipation performance, two heat dissipation fins 14 are fixed on the edge of the top surface of the power conversion circuit board, and the heat dissipation fan is attached to the end surface of the heat dissipation fins. Two cooling fans are respectively attached to the end surface of one cooling fin. In this embodiment, the heat dissipation fins are aluminum structures, which can improve heat conduction and heat dissipation performance.

An inspection port 15 is provided on the face shell, and a protective case cover 16 is buckled at the inspection port. Easy to carry out inspection and maintenance operations.

The structure of the utility model is reasonable. It is equipped with a power conversion circuit board in the housing to replace the battery pack in the prior art, and is electrically connected through the power plug-in line. The conversion of the power conversion circuit board meets the power supply requirements of DC electric tools. , which is conducive to improving the continuity of power supply. At the same time, it is equipped with a cooling fan, which is conducive to improving the overall heat dissipation performance, realizing over-temperature protection, and is conducive to improving the overall service life. It is stable and reliable in use, strong in applicability and practicality.

The standard parts used in this embodiment can be directly purchased from the market, and the non-standard structural parts recorded according to the instructions can also be processed directly according to the existing technical common sense, and the connection mode of each part adopts the existing There are mature conventional means in the technology, and the machinery, parts and equipment all adopt conventional models in the prior art, so no more specific descriptions are made here.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or changes derived from the essential spirit of the present utility model still belong to the protection scope of the present utility model.

Claims (9)

1. A power adapter for a DC electric tool, comprising a housing, a power conversion circuit board fixed in the housing, and a power plug wire electrically connected to the power conversion circuit board is arranged on the housing, its features In that: the housing includes a bottom case and a surface case fixed by screws, a heat dissipation strip groove is fixed on the side wall of the bottom case, at least one heat dissipation fan is fixed inside the side wall of the bottom case, and the heat dissipation fan is fixed inside the side wall of the bottom case. The fan is electrically connected to the control terminal of the power conversion circuit board, and the power conversion circuit board includes a power input terminal, a rectification filter circuit electrically connected to the power input terminal, and a rectification filter circuit connected to the output terminal of the rectification filter circuit. A high-power DC conversion circuit and a 20V voltage output terminal connected to the output terminal of the high-power DC conversion circuit, and a switching power supply circuit connected to the rectification and filtering circuit and a switching power supply circuit connected to the control terminal of the switching power supply circuit An optocoupler drive circuit, the optocoupler drive circuit is connected to the 20V voltage output terminal, and the switching power supply circuit is connected to the control terminal of the high-power DC conversion circuit. 2. A power adapter for a DC electric tool according to claim 1, characterized in that: the top of the cover is fixed with several conductive plug-in ports, and the inside of the cover is fixed with the power conversion port. The plug port contacts connected to the 20V voltage output terminals on the circuit board, the number of the plug port contacts is the same as the number of the conductive plug ports, and the plug port contacts are located in the conductive plug ports. 3. A power adapter for DC electric tools according to claim 2, characterized in that: two heat dissipation fins are fixed on the top edge of the power conversion circuit board, and the heat dissipation fan is attached to the heat dissipation fins on the end face. 4. A power adapter for DC electric tools according to claim 3, characterized in that: there are two cooling fans and the two cooling fans are arranged side by side inside the side wall of the bottom case, and the two cooling fans are respectively attached to Attached to the end face of a cooling fin. 5 . The power adapter for DC electric tools according to claim 4 , wherein the model of the main chip of the switching power supply circuit is NCP1252. 6 . The power adapter for DC electric tools according to claim 5 , wherein an inspection port is opened on the face shell, and a protective case cover is buckled at the inspection port. 7 . 7 . The power adapter for DC electric tools according to claim 6 , wherein the bottom shell and the top shell are both insulating plastic shells. 8. A power adapter for DC electric tools according to claim 7, characterized in that: the edge of the bottom surface of the front shell is integrally formed to limit the pressure against the screw hole column, the front shell and the bottom shell are combined and the The position-limiting and pressing screw hole column abuts against the bottom wall of the bottom case, and the screw thread is fixed on the position-limiting and pressing screw hole column. 9. A power adapter for DC electric tools according to claim 1, characterized in that: the side wall of the bottom case is provided with several slots, and the edge of the cover is integrally formed with the number and slots There are the same number of locking blocks, the bottom case is connected to the front shell and is initially limited by the locking blocks and the locking slots.

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