CN218648586U

CN218648586U - Charging device

Info

Publication number: CN218648586U
Application number: CN202222212072.5U
Authority: CN
Inventors: 曹亚飞; 张月祥; 袁园
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2023-03-17
Anticipated expiration: 2032-08-22

Abstract

The application discloses charging device includes: a housing formed with at least a first tuyere and a second tuyere; a circuit board assembly including at least a printed circuit board provided with a plurality of electronic components; a fan disposed in the housing, the fan rotating about a rotation axis for generating a cooling air flow passing through the first and second air ports; cooling air flows through at least the circuit board assembly; the axis of rotation is substantially perpendicular to the printed circuit board; in a first plane perpendicular to the axis of rotation, the projection of the fan onto the first plane is located within the projection of the printed circuit board onto the first plane. By adopting the scheme, the charging device which has the advantages of good heat dissipation effect, compact size and short overall length can be provided, and the charging device has stronger power output capability.

Description

Charging device

Technical Field

The application relates to a charging device, in particular to a high-power charging device.

Background

Riding lawn mowers need to be equipped with a charging device to charge them. Because the riding mower requires a large amount of battery capacity, in order to improve charging efficiency, the corresponding charging device needs to have a strong power output capability. After the power output capacity of the charging equipment is improved, the volume of the charging equipment is increased, and the heat dissipation effect is deteriorated.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the related art, the charger with the high-power output function is high in heat dissipation efficiency and short in whole machine length.

In order to achieve the above purpose, the following technical scheme is adopted in the application: 1. a charging device, comprising: a housing formed with at least a first tuyere and a second tuyere; a circuit board assembly including at least a printed circuit board provided with a plurality of electronic components; a fan disposed in the housing, the fan rotating about a rotation axis for generating a cooling air flow passing through the first and second air ports; cooling air flows through at least the circuit board assembly; the axis of rotation is substantially perpendicular to the printed circuit board; in a first plane perpendicular to the axis of rotation, the projection of the fan onto the first plane is located within the projection of the printed circuit board onto the first plane.

In some embodiments, the housing includes an upper housing and a lower housing, the printed circuit board being disposed within the lower housing, and the fan being fixedly mounted to the upper housing.

In some embodiments, the first air opening comprises a first air inlet and a second air inlet, and the second air opening comprises a first air outlet and a second air outlet; the first air inlet and the second air inlet are positioned on two sides of the fan in the left-right direction; the first air outlet and the second air outlet are positioned on two sides of the fan in the left-right direction.

In some embodiments, a baffle is formed or attached to the housing, and the housing and baffle define at least a first passage and a second passage for the flow of cooling air.

In some embodiments, the first tuyere and the second tuyere are located on both sides of the flow guide plate in the up-down direction.

In some embodiments, the first air inlet and the second air inlet are disposed on the upper housing, and the first cooling air flow entering the housing from the first air inlet and flowing out of the housing from the first air outlet flows through the first channel and the circuit board assembly in sequence; and a second cooling airflow which enters the shell from the second air inlet and flows out of the shell from the second air outlet flows through the second channel and the circuit board assembly in sequence.

In some embodiments, the first air outlet and the second air outlet are disposed on the upper housing, and the third cooling air flow entering the housing from the first air inlet and exiting the housing from the first air outlet flows through the circuit board assembly and the first channel in sequence; and a fourth cooling airflow which enters the shell from the second air inlet and flows out of the shell from the second air outlet flows through the circuit board assembly and the second channel in sequence.

In some embodiments, the electronic components include at least a heat generating component that generates more than 0.1kwh of heat during operation of the charging device; the heat generating element includes a power semiconductor device or a transformer.

In some embodiments, the output power of the charging device is greater than or equal to 500W and less than or equal to 2000W.

In some embodiments, the charging device is removably attachable to the power tool for charging the power tool.

A charging device, comprising: a housing formed with a first tuyere and a second tuyere; a circuit board assembly including at least a printed circuit board provided with a plurality of electronic components; a fan disposed in the housing, the fan rotating about a rotation axis for generating a cooling air flow passing through the first and second air ports; the axis of rotation is substantially perpendicular to the printed circuit board; the shell forms or is connected with a guide plate, and the guide plate and the shell form a channel for cooling airflow to circulate; the first air opening and the second air opening are positioned on two sides of the guide plate in the up-down direction.

In some embodiments, the duct includes a first duct and a second duct, which are located on both sides of the fan in the left-right direction.

In some embodiments, the first air port comprises a first air inlet and a second air inlet, and the second air port comprises a first air outlet and a second air outlet; the first air inlet and the second air inlet are positioned on two sides of the fan in the left-right direction; the first air outlet and the second air outlet are located on two sides of the fan in the left-right direction.

In some embodiments, the first air outlet and the second air outlet are disposed on the upper housing, and the third cooling air flow entering the housing from the first air inlet and exiting the housing from the first air outlet flows through the circuit board assembly and the first channel in sequence; and a fourth cooling air flow which enters the shell from the second air inlet and flows out of the shell from the second air outlet sequentially flows through the circuit board assembly and the second channel.

In some embodiments, the maximum output power of the charging device is greater than or equal to 1200W and less than or equal to 2000W.

Technical scheme more than adopting, through arranging the fan on charging device's top to set up the guide plate and form the first passageway and the second passageway that supply cooling air current circulation with the casing. Technical scheme in this application, can shorten charging device length in the left and right sides orientation, and have better radiating effect.

Drawings

Fig. 1 is a perspective view of a charging device as a specific embodiment;

fig. 2 is a sectional view of the charging device in fig. 1;

fig. 3 is an exploded view of the charging device of fig. 1 with the upper case removed;

FIG. 4a is a perspective view of the lower housing, the printed circuit board, and the first component;

FIG. 4b is a cross-sectional schematic view of the lower housing, printed circuit board, and first component of FIG. 4 a;

fig. 5 is a perspective view of the charging device of fig. 1 with the upper housing removed;

FIG. 6 is an exploded view of the structure of the input power cord, the printed circuit board and the first fastener;

fig. 7 is a sectional view of another charging device as a specific embodiment;

fig. 8 is an exploded view of the structure of the charging device in fig. 7;

fig. 9 is a partial sectional view of still another charging device as a specific embodiment;

fig. 10 is a partial exploded view of still another charging device as a specific embodiment;

fig. 11 is a schematic view of a flow direction of cooling air of the charging device in fig. 10;

fig. 12 is a schematic view showing another flow direction of cooling air of the charging device in fig. 10;

FIG. 13a is a circuit schematic of the circuitry of the charging device of FIG. 1;

FIG. 13b is a circuit schematic of circuitry of another embodiment of the charging device of FIG. 1;

fig. 14 is a circuit topology diagram of an interleaved parallel PFC power circuit in the circuitry in fig. 13 a;

FIG. 15 is a circuit topology diagram of a full bridge LLC resonant circuit in the circuitry in FIG. 13 a;

fig. 16 is a circuit topology diagram of a bridgeless PFC power circuit in the circuitry in fig. 13 a;

fig. 17 is a circuit topology diagram of a half bridge LLC resonant circuit in the circuit system in fig. 13 a.

Detailed Description

The present application will now be described more fully hereinafter with reference to the accompanying drawings, in which specific embodiments of the invention are shown.

Fig. 1 shows a charging device 100 as an embodiment of the present application, and the charging device 100 is capable of charging a battery pack. The battery pack can provide electric energy for some handheld electric tools such as electric drills and angle grinders, and can also be large-sized electric tools such as garden tools like intelligent lawn mowers and snow plows. The charging device 100 in this embodiment has a large output power, and is particularly suitable for providing a charging function for a large-sized battery pack of an electric power tool with a large output power. The large-sized electric tool having a large output may be a riding mower, a snow sweeper, or an intelligent walking electric tool. Indeed, the teachings of the present application are applicable to any type of charging device that charges a battery pack.

As shown in fig. 1 to 3, the charging device 100 includes a housing 10 assembled by an upper housing 11, a lower housing 12, a left housing 13, and a right housing 14. Wherein, the left casing 13 is provided with an air inlet 15 for air circulation. An air outlet 16 for air circulation is provided on the right housing 14. The airflow can flow into the housing 10 from an air inlet 15 on the housing 10 and out of the housing from an air outlet 16 on the housing 10. In other embodiments, the housing may be formed by assembling an upper housing and a lower housing in an up-down direction, and it is understood that the left and right housings originally separately provided are partially integrated with the upper housing or the lower housing, respectively. Of course, the housing may be formed by assembling the left housing and the right housing in the left-right direction, and it is understood that the upper housing and the lower housing which are originally separately provided are respectively partially integrally formed with the left housing or the right housing. It should be noted that the specific components of the housing 10 in the present application are not intended to limit the present application.

The housing 10 is formed with an accommodating space 101, and a fan 20 for generating a cooling air flow and a circuit board assembly 30 for performing a charging function of the charging device 100 are disposed in the accommodating space 101. Wherein the fan 20 is disposed near the air inlet 15 for drawing air outside the housing 10 into the housing 10 through the air inlet 15 to generate a cooling air flow. The circuit board assembly 30 includes a printed circuit board 31 and a plurality of electronic components disposed on a second surface 312 of the printed circuit board 31. The electronic components mentioned above comprise at least a heating element 32 and a heat sink 33 in heat-conducting connection with the heating element 32.

The printed circuit board 31 is provided with a printed circuit for connecting components such as resistors, capacitors, and corresponding semiconductor elements to realize the functions of the charging device 100. The heating element 32 generates heat when it is energized, specifically, generates heat of 0.1kwh or more, and is electrically connected to the printed circuit board 31. In the charging device 100, a plurality of different kinds and different specifications of the heating elements 32 may be provided, and more specifically, the heating elements 32 may be power semiconductor devices or transformers such as field effect transistors or the like, which may be soldered to the printed circuit board 31 by providing solder tails.

The heat sink 33 is in heat-conducting connection with the heating element 32 in order to transfer away the heat generated by the heating element 32 when energized. In some embodiments, the heat dissipation member 33 may be implemented as a heat dissipation plate, which may be a single plate or a plurality of separate plates, but the heat conduction between the separate plates is interrupted, so that an optimal heat dissipation effect cannot be achieved. Referring to fig. 3, at least a portion of the heat dissipating member 33 is in contact with a surface of the plurality of heating elements 32, and heat generated by the plurality of heating elements 32 is conducted to itself by using the principle of heat conduction and then dissipated by the flow of cooling air. In general, in order to enhance the heat dissipation effect of the heat dissipation member 33, the surface of the heat dissipation member 33 in contact with the plurality of heat generation elements 32 is designed to have a plate-like structure so as to maximize the contact area therebetween. Meanwhile, one end of the heat dissipation member 33 is formed in a comb shape to maximize a heat dissipation area. The heat sink 33 may be disposed inside the housing 10 of the charging device 100, and of course, a part of the housing 10 may be exposed to perform a heat dissipation function. It should be noted that the heat dissipation member 33 in the present embodiment functions to transfer the heat generated by the plurality of heating elements 32 to the air through its own good heat conduction performance, and as for the material and shape of the heat dissipation member 33 described above, it should not be considered as a limitation to the present application, and those skilled in the art should specifically set the heat dissipation member according to the actual situation.

The charging device 100 further includes a baffle 17 detachably provided in the housing 10 for guiding a circulation direction of the cooling air flow flowing into the interior of the housing 10 to improve heat dissipation efficiency of the charging device 100. Specifically, the shutter 17 is disposed in the accommodating space 101 formed by the housing 10 and detachably connected to the upper housing 11. Referring to fig. 2, the baffle 17 is fixed to the upper housing 11 and forms a heat dissipation channel 40 for circulating cooling air with the lower housing 12 and a part of the upper housing 11. The baffle 17 in this embodiment can be detachably connected to the upper housing 11 by assembling, which is advantageous in facilitating later maintenance, such as reducing maintenance costs. On the other hand, the heat dissipation channel can be adjusted flexibly according to heat dissipation requirements, and different heat dissipation requirements are met. Of course, the baffle 17 may be formed integrally with the housing 10, and is not limited thereto. The baffle 17 is preferably provided in the same material as the housing 10, such as plastic. The baffle 17 may also be made of other materials with good heat conduction performance, and the material of the baffle 17 is not limited in this application.

In some embodiments, referring to fig. 3-4 b, the charging device 100 further includes a first element 122 disposed between the printed circuit board 31 and the lower housing 12. Wherein at least a portion of the first element 122 abuts the first surface 311 of the printed circuit board 31. When the charging device 100 vibrates under the action of external force, the first element 122 can be elastically deformed, so that the probability that the printed circuit board 31 is broken due to the action of external force is reduced. In this embodiment, the lower case 12 is formed with or connected to an accommodating portion 121 for accommodating at least a part of the first member 122. The receiving portion 121 is provided as a recess in which the first member 122 is partially disposed, the recess being integrally formed with the lower case 12. The top end of the first element 122 is slightly higher than the top end of the accommodating part 121 so that the printed circuit board 31 does not directly contact with the accommodating part 121. In this embodiment, the first element 122 is configured as a sealant with a heat conducting function, which is used to transfer heat on the circuit board assembly to the housing, and has a heat conductivity greater than or equal to 1W/(m · K).

In this embodiment, a ratio of a projected area of the first element 122 on the first surface 311 of the printed circuit board 31 to an area of the first surface 311 is greater than or equal to 0.2 and less than or equal to 0.8. In some embodiments, a ratio of a projected area of the first element 122 on the first surface 311 of the printed circuit board 31 to an area of the first surface 311 is greater than or equal to 0.3 and less than or equal to 0.6. In some embodiments, a ratio of a projected area of the first element 122 on the first surface 311 of the printed circuit board 31 to an area of the first surface 311 is greater than or equal to 0.4 and less than or equal to 0.5. In some embodiments, the ratio of the projected area of the first element 122 on the first surface 311 of the printed circuit board 31 to the area of the first surface 311 is 0.3.

Because charging device in this application has stronger power output ability, adopt conventional encapsulating to handle the great and radiating efficiency reduction of weight that can make charging device's complete machine. Therefore, by adopting the first element in the embodiment, the heat dissipation efficiency of the charging device can be improved, and the overall weight of the charging device can be reduced.

In some embodiments, the charging device 100 may be used to charge a variety of power tools, such as a riding lawn mower or a riding snow sweeper. Referring to fig. 1, 5 and 6, the charging device 100 further includes an input power line 50 for receiving an external ac power source such as a commercial power, and an output power line 60 for outputting power to charge the power tool. The output power line 60 is at least partially disposed in the receiving space 101 formed by the housing 10. Specifically, the output power line 60 has a first end 61 and a second end 62. The housing 10 is formed with a first through hole (not shown) through which the first end 61 of the output power line 60 is electrically connected to the printed circuit board 31. A charging interface 621 for electrical connection with the power tool is connected to the second end 62 of the output power cord 60. In some embodiments, the charging interface 621 takes the form of a charging gun that is electrically connected to the power tool. In this embodiment, the output power of the charging device 100 is greater than or equal to 500W and less than or equal to 2000W. In some embodiments, the output power of the charging device 100 is greater than or equal to 800W and less than or equal to 1600W. In some embodiments, the output power of the charging device 100 is greater than or equal to 1000W and less than or equal to 1400W. In some embodiments, the maximum output power of the charging device 100 is greater than or equal to 1200W and less than or equal to 2000W. The output power supply line 60 has a wire diameter of 20AWG to 10AWG. The length of the portion of the output power supply line 60 disposed outside the housing 10 is 1m or more and 5m or less.

In order to facilitate the user to operate the charging interface 621 to charge the electric tool, the designer may lengthen the length of the output power line 60 during design, so as to meet the charging requirements of different distances. When the user charges the electric power tool using the charging interface 621 or forgets to store the output power line 60 after the charging is completed, the output power line is damaged by the user stepping on the power line. In short, since the charging interface 621 is frequently operated by the user, the cable of the power cord is easily damaged and the contact with the printed circuit board 31 is poor. It takes much time and even damages the printed circuit board when the user needs to replace the damaged power cord.

The output power line 60 in this embodiment has a function of being detachable and easy to install. Referring to fig. 6, the first end 61 of the output power line 60 is connected to the printed circuit board 31 by a detachable first fastener 611, so that the charging port 621 is electrically connected to the printed circuit board 31. The output power line 60 extends out of the positive and negative leads, and one end of the lead is connected with a gasket having a conductive function. A mounting portion 612 for electrically conducting and fixedly connecting with the first fastening member 611 is connected to the printed circuit board 31. In this embodiment, the first fastening member 611 is provided as a screw. Of course, the first fastening member 611 may also be provided as a socket connector. Wherein a first portion of the connector is electrically connected to a first end 61 of the output power line 60 and a second portion of the connector is electrically connected to the printed power board 31. The first and second parts of the connector are connected by means of a bayonet connection. The connector in this embodiment has a waterproof function. It is to be understood that the above description has been merely exemplary of an embodiment in which the output power line 60 is detachably electrically connected to the printed power board 31, and should not be construed as the only way.

By adopting the structure of screw fastening or connector assembly, the output power line 60 and the printed circuit board 31 can be electrically connected, and meanwhile, the follow-up maintenance work can be facilitated, and the maintenance cost can be reduced.

In this embodiment, the charging device 100 further includes a second fastening piece 613 for fixing the output power line 60 to the lower housing 12, so as to avoid the phenomenon that the user may contact the printed circuit board poorly when dragging the power line. In this embodiment, the second fastening piece 613 is fixed to the lower case 12 by means of screw fastening.

In some embodiments, the charging device 100 further includes a plurality of magnetic rings disposed on the input power line 50 and the output power line 60 for improving the interference resistance to high frequency signals. Referring to fig. 5, the output power line 60 is sleeved with a first magnetic ring 631, and the input cable 50 is provided with a second magnetic ring 632 and a third magnetic ring 633. In this embodiment, on the extending path of the output power line 60, the distance from the first magnetic ring 631 to the first end 61 of the output power line 60 is less than or equal to 1m.

When the charging device 100 charges the battery pack in the electric power tool, the charging current output by the charging device 100 is 15A or more and 30A or less. It can be understood that when the charging device 100 is in an operating state, the heat generated by the circuit board assembly 30 is relatively high, and if the heat inside the charging device 100 cannot be dissipated in time, the operating efficiency of the charging device will be reduced, and even a potential safety hazard will be brought about. In this embodiment, the heat generated by the heating element 32 during the operation of the charging device 100 is greater than 0.1kwh. In some embodiments, the fan is disposed obliquely so as to make the amount of air blown to the circuit board assembly 30 larger, thereby improving the heat dissipation effect of the charging device 100, and simultaneously, the height of the charging device in the up-down direction can be reduced, so that the volume of the charging device is more compact.

Referring to fig. 7 to 8, the charging device 100a includes a fan 20a for generating a cooling air flow to dissipate heat from an inner space of the charging device 100 a. The fan 20a is disposed at an end of the housing 10 remote from the outlet 16. The fan 20a has a fan inlet 21a close to the inlet 15 and a fan outlet 22a far from the inlet 15. When the fan 20a is started when the charging device 100a starts to operate, the air outside the casing 10 generates a cooling air flow by the fan 20a, and the direction of the cooling air flow is shown by an arrow in fig. 7. After entering the housing 10 from the air inlet 15, the cooling air flows through the fan air inlet 21a, the fan 20a and the fan air outlet 22a, passes through the circuit board assembly 30, and finally flows out from the air outlet 16, so as to take away heat in the housing 10 to dissipate heat of the charging device. In some embodiments, the flow direction of the cooling air flow flowing out of the fan outlet 22a is arranged obliquely with respect to the printed circuit board 31.

In some embodiments, the fan 20a includes a fan housing distributed in a radial direction of the fan 20a for fixedly mounting the fan 20a to the casing 10. The outer side of the fan outer frame is wrapped with shock-absorbing materials such as rubber, foam and the like. When the fan 20a rotates rapidly, especially when the air flow impinges on the fan 20a rapidly, the vibration of the fan 20a itself can be reduced to some extent by the presence of the vibration-damping material, thereby achieving the noise-reducing effect. The blades of the fan 20a rotate about the rotational axis 201 a. The rotation axis 201a is disposed obliquely with respect to the printed circuit board 31. In some embodiments, the angle α between the rotation axis 201a and the printed circuit board 31 is greater than 0 ° and equal to or less than 45 °. The included angle α between the rotation axis 201a and the printed circuit board 31 is not less than 15 ° and not more than 30 °. In some embodiments, the rotation axis 201a is at an angle α of 20 ° to the printed circuit board 31.

In some embodiments, the fan can also be disposed on the air outlet side of the charging device. Referring to fig. 9, the charging device 100b includes a fan 20b, and the fan 20b is disposed at an end of the housing 10 far from the air inlet 15. The fan 20b has a fan inlet 21b near the inlet 15 and a fan outlet 22b far from the inlet 15. When the charging device 100b starts to operate, the fan 20b is started, and the air outside the housing 10 generates a cooling air flow under the action of the fan 20b, wherein the direction of the cooling air flow is shown by an arrow in fig. 9. After entering the housing 10 from the air inlet 15, the cooling air flows through the printed circuit board 31, the fan inlet 21b, the fan 20b, and the fan outlet 22b, and finally flows out from the air outlet 16, so as to take away heat in the housing 10 to dissipate heat of the charging device 100 b. In this embodiment, the blades of the fan 20b rotate around the rotation axis 201 b. The rotation axis 201b is disposed obliquely with respect to the printed circuit board 31. In some embodiments, the included angle β between the rotation axis 201b and the printed circuit board 31 is greater than 0 ° and equal to or less than 45 °. The included angle beta between the rotation axis 201b and the printed circuit board 31 is greater than or equal to 15 degrees and less than or equal to 30 degrees. In some embodiments, the rotation axis 201b is at an angle of 20 ° to the printed circuit board 31.

Two embodiments of the fan in an inclined arrangement with respect to the printed circuit board have been described above. When the charging device works and the fan runs, the cooling airflow generated by the fan is obliquely arranged relative to the printed circuit board, so that on one hand, the air volume flowing through the printed circuit board can be increased, and the heat dissipation effect is improved. On the other hand, because the fan sets up for the fan is high reduction in the upper and lower direction, thereby reduces charging device's height, makes charging device's structure compacter, and the volume is littleer.

In some embodiments, the fans may take other arrangements. Referring to fig. 10 and 11, a fan is provided at an upper end of the charging device, thereby shortening the length of the charging device in the left-right direction. Specifically, the charging device 100c includes a housing 10 assembled by an upper housing 11, a lower housing 12, a left housing 13, and a right housing 14. The housing 10 is formed with an accommodating space 101, and a fan 20c for generating a cooling air flow and a circuit board assembly 30 for performing a charging function of the charging device 100c are disposed in the accommodating space 101. Among other things, the fan 20c is used to generate a cooling airflow to carry away heat generated inside the charging device 100 c. The circuit board assembly 30 includes a printed circuit board 31 and a plurality of electronic components disposed on the printed circuit board 31. Wherein the printed circuit board 31 is disposed within the lower case 12.

In this embodiment, the charging device 100c further includes a baffle 18 fixedly mounted to the housing 10. The baffle 18 is generally sheet-like and substantially parallel to the printed circuit board 31. A mounting portion (not shown) for mounting the fan 20c is formed in the middle region of the air guide 18. In this embodiment, the fan 20c may be an axial fan or a centrifugal fan, and the present application is not limited thereto. Of course, in some embodiments, the fan 20c may also be fixedly mounted to the housing 10, such as the upper housing 11. In some embodiments, fan 20c may also be mounted to both baffle 18 and upper housing 11.

Specifically, the fan 20c rotates about a rotation axis 201c, the rotation axis 201c being substantially perpendicular to the printed circuit board 31. In a first plane 202 perpendicular to the axis of rotation 201c, the projection of the fan 201c onto the first plane 202 is located in the projection of the printed circuit board 31 onto the first plane 202. It will be appreciated that the fan 20c is disposed entirely above the printed circuit board 31.

The housing 10 is formed with at least a first tuyere 15c and a second tuyere 16c. Wherein, the first tuyere 15c and the second tuyere 16c are located at both sides of the deflector 18 in the up-down direction. The fan 20c can generate cooling air flows through the first and

second vents

15c and 16c while rotating about the rotation axis 201 c. The casing 10 and the baffle 18 are formed with at least a first passage 41 and a second passage 42 through which the cooling airflow flows. Wherein the cooling air flow flows at least through the circuit board assembly 30, thereby carrying away heat generated by the heat generating components on the printed circuit board 31.

In some embodiments, the first tuyere 15c serves as an inlet and the second tuyere 16c serves as an outlet. Specifically, the first air inlet 15c includes a first air inlet 151c and a second air inlet 152c. The second air opening 16c includes a first air outlet 161c and a second air outlet 162c. Among them, the first and second intake vents 151c and 152c are located at both sides of the fan 20c in the left-right direction. The first outlet 161c and the second outlet 162c are located at both sides of the fan 20c in the left-right direction. In some embodiments, the first and second intake vents 151c and 152c are disposed on the upper housing 11, and the first cooling air flow entering the housing 10 from the first intake vent 151c and exiting the housing 10 from the first outlet 161c flows through the first channel 41, the fan 20c and the circuit board assembly 30 in sequence. The second cooling air flow entering the housing 10 from the second air inlet 152c and exiting the housing 10 from the second air outlet 162c flows through the second channel 42, the fan 20c and the circuit board assembly 30 in sequence. The flow direction of the first cooling air flow is shown by arrow a in fig. 11, and the flow direction of the second cooling air flow is shown by arrow b in fig. 11.

In some embodiments, the first port 15c serves as an outlet port and the second port 16c serves as an inlet port. Specifically, referring to fig. 12, the first air outlet includes a first air outlet 151c and a second air outlet 152c. The second port 16c includes a first intake vent 161c and a second intake vent 162c. The first outlet 151c and the second outlet 152c are located at two sides of the fan 20c in the left-right direction. The first and second intake vents 161c and 162c are located at both sides of the fan 20c in the left-right direction. In some embodiments, the first and

second air inlets

161c and 162c are disposed in the left and

right housings

13 and 14, respectively. The first and

second outlet ports

151c and 152c are provided on the upper case 11. Specifically, the third cooling air flow entering the housing 10 from the first air inlet 161c and flowing out of the housing 10 from the first air outlet 151c flows through the circuit board assembly 30, the fan 20c and the first channel 41 in sequence. The fourth cooling airflow entering the housing 10 from the second air inlet 162c and flowing out of the housing 10 from the second air outlet 152c flows through the circuit board assembly 30, the fan 20c and the second channel 42 in sequence. The flow direction of the third cooling air flow is shown by the arrow c in fig. 12, and the flow direction of the fourth cooling air flow is shown by the arrow d in fig. 12.

By adopting the above technical scheme, the fan 20c is arranged above the charging device 100c, and the length of the charging device in the left-right direction can be shortened, so that the overall length of the charging device is smaller, and the structure is more compact.

In some embodiments, the charging device 100 further includes circuitry for controlling the state of the charging device 100. The charging device 100 receives external alternating current, performs voltage conversion through an internal voltage conversion circuit, and finally outputs a charging voltage or a charging current meeting the requirement to charge the electric tool.

Referring to fig. 13a, the circuitry comprises an ac input 71, a PFC power circuit 72, an LLC resonant circuit 73 and a dc output 74. Wherein the ac input terminal 71 is used for receiving the commercial power or other forms of ac U _in . The PFC power circuit 72 is used for connecting the AC power U _in Is converted into a first direct current U _p . The LLC resonant circuit 73 is for supplying a first direct current U _p Converted into a second direct current U _out . The dc output terminal 74 is used for outputting a second dc current U _out To charge the power tool. In some embodiments, the circuitry further includes a first controller 75 and a second controller 76. The first controller 75 is electrically connected to the PFC power circuit 72 to control a state of the PFC power circuit 72. The second controller 76 is electrically connected to the LLC resonant circuit 73 to control the state of the resonant circuit 73. In some embodiments, referring to fig. 13b, the difference from the circuit system of fig. 13a is that only one controller 77 is provided, and the controller 77 is electrically connected to both the PFC power circuit 72 and the LLC resonant circuit 73 for use in the sameControlling the state of the PFC power circuit 72 and the LLC resonant circuit 73.

In this embodiment, the output power of the charging device 100 is greater than or equal to 500W and less than or equal to 2000W. In some embodiments, the output power of the charging device 100 is greater than or equal to 800W and less than or equal to 1600W. In some embodiments, the ac power U is supplied to the ac power input 71 _in Has an effective voltage value of 85V or more and 264V or less. First direct current U output by PFC power circuit 72 _p The voltage value of (2) is 350V or more and 410V or less. Second direct current U output by the direct current output terminal 74 _out The voltage value of (2) is not less than 21V and not more than 60V. It is understood that the charging device 100 in the present embodiment can convert the alternating current with the voltage effective value between 85V and 264V into the direct current with the voltage value between 21V and 60V. Specifically, the first controller 75 and the second controller 76 control the operating states of the PFC power circuit and the LLC resonant circuit 73, so as to control the second direct current U output from the direct current output terminal 74 _out To meet the charging voltage requirements of different power tools.

In the related art, the conventional PFC power circuit 72 includes an interleaved parallel PFC power circuit and a bridgeless PFC power circuit. In this embodiment, the common LLC resonant circuit 73 includes a full-bridge LLC resonant circuit and a half-bridge LLC resonant circuit. The staggered parallel PFC power circuit can realize higher power factor and reduce harmonic pollution to a power grid, thereby being widely applied.

Next, a circuit schematic diagram of the circuit system and an operation principle in the present application will be described with reference to fig. 14 and 15. In this embodiment, the PFC power circuit 72 adopts an interleaved parallel PFC power circuit, and the LLC resonant circuit 73 adopts a full-bridge LLC resonant circuit.

Referring to fig. 14, PFC power circuit 72 includes a rectifier bridge 721, a boost circuit 722, and an output filter capacitor C1. The rectifier bridge 721 is composed of four diodes D1, D2, D3, and D4, and is used for converting an input ac voltage into a dc voltage. The input end of the rectifier bridge 721 receives alternating current U _in . The boost circuit 722 is connected to the output terminal of the rectifier bridge 721 and is used for turning the rectifier bridge 721The converted DC voltage is boosted. The output filter capacitor C1 is connected to the output end of the boost circuit 722 and the load, and the dc voltage boosted by the boost circuit 722 is loaded on the output filter capacitor C1 and provides a stable voltage for the load. Specifically, the booster circuit is a Boost circuit. The boost circuit 722 includes two sets of boost sub-circuits, which are connected in parallel and interleaved with each other. Each group of the boosting branch circuits comprises an inductor and two switching tubes, and the two switching tubes are connected with the inductor in series. The first group of boosting branch circuits comprise an inductor L1 and switching tubes Q1 and Q3 which are mutually connected with the inductor L1 in series. The second group of boost sub-circuits comprises an inductor L2 and switching tubes Q2 and Q4 which are mutually connected in series with the inductor L2. The above components are structurally connected in parallel to form a main circuit of the interleaved parallel PFC power circuit 72, so that low-voltage to high-voltage and alternating-current to direct-current conversion is realized. The output filter capacitor C1 is connected with the output ends of the two groups of boosting branch circuits, and the stability of the output voltage can be ensured through the output filter capacitor C1. The first controller 75 outputs a driving signal to the driving circuit 723 to control the conduction states of the four switching tubes Q1 and Q3, Q2 and Q4. Q1 and Q3, Q2 and Q4 are alternately conducted.

In this embodiment, the four switching tubes Q1 and Q3, and Q2 and Q4 are gallium nitride transistors. Compared with the traditional silicon-based semiconductor, the gallium nitride transistor has more excellent breakdown capability, higher electron density and electron mobility and higher working temperature. Because the gallium nitride transistor can bear higher switching frequency, the power loss of the interleaved PFC power circuit 72 can be reduced, and the size and the weight of the charging device can be reduced. In this embodiment, the frequency range of the driving signal output by the driving circuit 723 for controlling the on and off of the four switching tubes Q1 and Q3, Q2 and Q4 is 56kHz to 110kHz. The driving circuit 723 outputs a driving signal of a corresponding frequency based on the control signal output by the first controller 75 to control the on and off states of the four switching tubes Q1 and Q3, Q2 and Q4, so as to stagger the first direct current U output by the parallel PFC power circuit 72 _p Varies between 350V and 410V.

Referring to FIG. 15, the LLC resonant circuit 73 comprises an input 730, an inverter circuit 731, a resonant circuit 732, an isolation transformer 733, a rectifier filterThe wave circuit 734, the output terminal 735, and at least a driving circuit 736 electrically connected to the inverter circuit 731, and the second controller 76 electrically connected to the driving circuit 736. Wherein, the input end 730 of the LLC resonant circuit 73 is electrically connected to the PFC power circuit 72, and is configured to receive the first direct current U output by the PFC power circuit 72 _p . An output 735 of the LLC resonant circuit 73 is arranged to output the second direct current U _out To provide a charging voltage for the power tool.

Specifically, the inverter circuit 731 includes four switching tubes Q5, Q6, Q7, and Q8. The switching tube Q5 and the switching tube Q7 are connected in series and in parallel to the output end 730, and the switching tube Q6 are connected in series and in parallel to the output end 730. In the present embodiment, four switching tubes Q5 and Q6, and Q7 and Q8 are provided as transistors. In this embodiment, the four switching tubes Q5 and Q6, and Q7 and Q8 are gallium nitride transistors.

The resonant circuit 732 includes a resonant inductor Lr, a resonant capacitor Cr, and an excitation inductor Lm. The resonant inductor Lr, the resonant capacitor Cr and the excitation inductor Lm are sequentially connected in series between a node a formed by connecting the switching tube Q5 and the switching tube Q7 in series and a node B formed by connecting the switching tube Q6 and the switching tube Q8 in series. The magnetizing inductance Lm is also electrically connected to both sides of the output terminal of the transformer 733. In the present embodiment, the ratio of the excitation inductance Lm to the resonance inductance Lr is not less than 3 and not more than 10. In some embodiments, the ratio of the magnetizing inductance Lm to the resonant inductance Lr is equal to or greater than 5 and equal to or less than 7. In this embodiment, the quality factor Q of the resonant circuit 732 is 0.1 or more and 2 or less. In some embodiments, the quality factor Q of the resonant circuit 732 is greater than or equal to 0.5 and less than or equal to 1.5. In some embodiments, the quality factor Q of the resonant circuit 732 is equal to or greater than 1 and equal to or less than 1.2.

The isolation transformer 733 is electrically connected to the resonance circuit 732, and transforms the voltage output from the resonance circuit 732. In some embodiments, the transformation ratio N of the isolation transformer is equal to or greater than 6 and equal to or less than 12. In some embodiments, the transformation ratio N of the isolation transformer is greater than or equal to 8 and less than or equal to 10. In this embodiment, the isolation transformer 733 is provided as a planar transformer. Compared with the common transformer, the planar transformer is a transformer with small volume and high working frequency. The planar voltage transformer is smaller in size and higher in electric energy conversion efficiency, so that the size of the heat dissipation part can be reduced, and the overall size and weight of the charging device are further reduced.

The rectifier filter circuit 734 is electrically connected to the transformer 733, and is configured to rectify and filter the voltage output by the transformer 733. In this embodiment, the rectifying-filtering circuit 734 at least includes a diode D5, a diode D6 and an output-filtering capacitor C ₀ 。

In this embodiment, a mode of combining the interleaved parallel PFC power circuit and the full bridge LLC rectifier circuit is adopted, so that the circuit system of the charging device is ensured to have a smaller size while the high-efficiency conversion from ac to dc is realized. The output power of the charging device in this embodiment is equal to or greater than 500W and equal to or less than 2000W. In this embodiment, the ratio of the output power of the charging device to the volume of the charging device is greater than or equal to 20W/in ³ And is less than or equal to 30W/in ³ . In some embodiments, the ratio of the output power of the charging device to the volume of the charging device is greater than or equal to 24W/in ³ And is less than or equal to 26W/in ³ 。

Of course, in some embodiments, the PFC power circuit may also adopt other forms of circuits to implement the voltage conversion function. Such as a bridgeless PFC power circuit. Referring to fig. 16, the bridgeless PFC power circuit 72a is used to switch in the alternating current U _in And will be connected with an alternating current U _in Is converted into a first direct current U _p . Unlike the interleaved PFC power circuit shown in fig. 14, the bridgeless PFC power circuit 72a does not include a bridge circuit, and the first controller 75 outputs a control signal to the driving circuit 723 to control the on/off of the switching tubes Q21 and Q22. The switching tube Q21 and the switching tube Q22 are gallium nitride transistors. By adopting the bridgeless PFC circuit, the circuit structure is simpler, the complexity of a circuit system is further reduced, and the size of a charging system can be reduced. Fig. 16 is merely an exemplary illustration of a bridgeless PFC circuit, and in fact, those skilled in the art may also use other forms of bridgeless PFC circuits to implement the voltage conversion function.

In some implementationsIn this example, the LLC resonant circuit 73 may also adopt other types of circuits to realize the voltage conversion function. For example a half bridge LLC resonant circuit. Referring to fig. 17, a half-bridge LLC resonant circuit 73a is used to switch in a first direct current U _p And the first direct current U is converted into _p Converted into a second direct current U _out And outputting to charge the electric tool. The difference from the full-bridge LLC resonant circuit shown in fig. 15 is that the half-bridge LLC resonant circuit 73a makes the circuit structure simpler, thereby reducing the complexity of the circuit system and reducing the size of the charging system. Fig. 17 is merely an exemplary illustration of another LLC resonant circuit, and indeed, one skilled in the art may implement the voltage conversion function using other forms of LLC resonant circuits.

The foregoing shows and describes the basic principles, features and advantages of the present application. It should be understood by those skilled in the art that the above-described embodiments are not intended to limit the present application in any way, and all technical solutions obtained by means of equivalents or equivalent changes fall within the protection scope of the present application.

Claims

1. A charging device, comprising:

a housing formed with at least a first tuyere and a second tuyere;

a circuit board assembly including at least a printed circuit board provided with a plurality of electronic components;

a fan disposed within the housing, the fan rotating about an axis of rotation for generating a cooling airflow through the first and second vents; the cooling airflow flows through at least the circuit board assembly;

wherein,

the axis of rotation is substantially perpendicular to the printed circuit board;

in a first plane perpendicular to the axis of rotation, the projection of the fan onto the first plane is located within the projection of the printed circuit board onto the first plane.

2. A charging arrangement as claimed in claim 1, in which the housing comprises an upper housing and a lower housing, the printed circuit board being disposed within the lower housing, the fan being fixedly mounted to the upper housing.

3. The charging device of claim 2, wherein the first air opening comprises a first air inlet and a second air inlet, and the second air opening comprises a first air outlet and a second air outlet; the first air inlet and the second air inlet are positioned on two sides of the fan in the left-right direction; the first air outlet and the second air outlet are located on two sides of the fan in the left-right direction.

4. A charging arrangement as claimed in claim 3, in which the housing forms or is connected to a baffle, the housing and baffle forming at least first and second passages for the cooling air flow.

5. The charging device according to claim 4, wherein the first air opening and the second air opening are located on both sides of the air guide plate in an up-down direction.

6. The charging device according to claim 4, wherein the first air inlet and the second air inlet are provided on the upper housing, and a first cooling air flow entering the housing from the first air inlet and exiting the housing from the first air outlet flows through the first passage and the circuit board assembly in this order; and a second cooling air flow which enters the shell from the second air inlet and flows out of the shell from the second air outlet sequentially flows through the second channel and the circuit board assembly.

7. The charging device according to claim 4, wherein the first air outlet and the second air outlet are provided on the upper case, and a third cooling air flow that enters the case from the first air inlet and exits the case from the first air outlet flows through the circuit board assembly and the first passage in this order; and a fourth cooling airflow which enters the shell from the second air inlet and flows out of the shell from the second air outlet sequentially flows through the circuit board assembly and the second channel.

8. A charging arrangement as claimed in claim 1, in which the electronic components comprise at least a heat generating component which generates more than 0.1kwh of heat during operation of the charging arrangement; the heating element includes a power semiconductor device or a transformer.

9. The charging device according to claim 1, wherein an output power of the charging device is 500W or more and 2000W or less.

10. A charging arrangement as claimed in claim 1, in which the charging arrangement is detachably connectable to a power tool for charging the power tool.

11. A charging device, comprising:

a housing formed with a first tuyere and a second tuyere;

a fan disposed within the housing, the fan rotating about an axis of rotation for generating a cooling airflow through the first and second vents; the axis of rotation is substantially perpendicular to the printed circuit board;

wherein,

a guide plate is formed or connected with the shell, and a channel for cooling airflow to flow is formed between the guide plate and the shell;

the first air opening and the second air opening are located on two sides of the guide plate in the up-down direction.

12. The charging device according to claim 11, wherein the duct includes a first duct and a second duct, the first duct and the second duct being located on both sides of the fan in the left-right direction.

13. The charging device of claim 12, wherein the first air opening comprises a first air inlet and a second air inlet, and the second air opening comprises a first air outlet and a second air outlet; the first air inlet and the second air inlet are positioned on two sides of the fan in the left-right direction; the first air outlet and the second air outlet are located on two sides of the fan in the left-right direction.

14. The charging device of claim 13, wherein the first air inlet and the second air inlet are disposed on an upper housing, and a first cooling air flow entering the housing from the first air inlet and exiting the housing from the first air outlet flows through the first channel and the circuit board assembly in sequence; and a second cooling air flow which enters the shell from the second air inlet and flows out of the shell from the second air outlet sequentially flows through the second channel and the circuit board assembly.

15. The charging device of claim 13, wherein the first outlet and the second outlet are disposed on an upper housing, and a third cooling airflow entering the housing from the first inlet and exiting the housing from the first outlet flows through the circuit board assembly and the first channel in sequence; and a fourth cooling airflow which enters the shell from the second air inlet and flows out of the shell from the second air outlet sequentially flows through the circuit board assembly and the second channel.

16. A charging arrangement as claimed in claim 11, in which the electronic components include at least a heat generating component which generates more than 0.1kwh of heat during operation of the charging arrangement; the heating element includes a power semiconductor device or a transformer.

17. The charging device of claim 11, wherein the maximum output power of the charging device is greater than or equal to 1200W and less than or equal to 2000W.

18. A charging arrangement as claimed in claim 11, in which the charging arrangement is detachably connectable to a power tool for charging the power tool.