CN214479791U - Charger and charging system - Google Patents
Charger and charging system Download PDFInfo
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- CN214479791U CN214479791U CN202023062185.9U CN202023062185U CN214479791U CN 214479791 U CN214479791 U CN 214479791U CN 202023062185 U CN202023062185 U CN 202023062185U CN 214479791 U CN214479791 U CN 214479791U
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Abstract
The utility model discloses a charger and charging system, the charger includes: the charging input interface is used for accessing first alternating current; the first rectifying and filtering circuit is used for converting the first alternating current into a first direct current; a conversion circuit for modulating the first direct current to output a second alternating current; the second rectifying and filtering circuit is used for converting the second alternating current into second direct current; the charging output interface is used for outputting second direct current; a control circuit for controlling the conversion circuit; the second rectifying and filtering circuit includes: a rectifier circuit including a rectifier diode; a filter circuit comprising an electrolytic capacitor assembly for storing energy; wherein, the ratio of the total capacity of the electrolytic capacitor component to the output power of the charger is more than or equal to 2.8uF/W and less than or equal to 4.0 uF/W. The charger in the charging system is small in size and light in weight.
Description
Technical Field
The utility model relates to a charger and charging system.
Background
Electric tools such as electric drills, electric circular saws, sanders, mowers, etc. typically use a battery pack as an energy source, and thus, these electric tools are environmentally friendly and do not pollute the environment during use. The battery package can save certain electric quantity, and when the battery package electric quantity was not enough, the battery package need use the charger to charge. However, the conventional charger has a large volume, a large weight and poor suitability. Therefore, when a user needs to go out for work, the user cannot randomly find the charger matched with the battery pack, and the user needs to carry the charger together. The existing charger is heavy, so that a user is laboursome in the carrying process. Moreover, the charger is bulky, and a user needs to prepare a large tool kit to accommodate the power tool, the battery pack and the charger.
SUMMERY OF THE UTILITY MODEL
For solving the deficiencies of the prior art, an object of the utility model is to provide a small and light in weight's charger and charging system.
In order to achieve the above object, the utility model adopts the following technical scheme:
a charger, comprising: the charging input interface is used for accessing first alternating current; the first rectifying and filtering circuit is used for converting the first alternating current into a first direct current; a conversion circuit for modulating the first direct current to output a second alternating current; the second rectifying and filtering circuit is used for converting the second alternating current into second direct current; the charging output interface is used for outputting second direct current; a control circuit for controlling the conversion circuit; the second rectifying and filtering circuit includes: a rectifier circuit including a rectifier diode; a filter circuit comprising an electrolytic capacitor assembly for storing energy; wherein, the ratio of the total capacity of the electrolytic capacitor component to the output power of the charger is more than or equal to 2.8uF/W and less than or equal to 4.0 uF/W.
In some embodiments, the ratio of the total volume of the electrolytic capacitor assembly to the output power of the charger is greater than or equal to 5mm3W is not more than 20mm3/W。
In some embodiments, the conversion circuit comprises: a transformer; the switch circuit is connected to the first rectifying and filtering circuit and the transformer; the switching circuit comprises a switching element, the switching element comprises a control end electrically connected with the control circuit, and the control circuit controls the switching element to be conducted at a switching frequency which is greater than or equal to 150kHz and less than or equal to 1000 kHz.
In some embodiments, the excitation inductance of the transformer is equal to or greater than 140uH and equal to or less than 200 uH.
In some embodiments, the output voltage of the charger is 10V or more and 100V or less.
A charging system comprises a battery pack and a charger for charging the battery pack, wherein the battery pack comprises a cell assembly for storing electric energy, the cell assembly comprises cell units, and the number of the cell units is more than or equal to 3; the charger includes: the charging input interface is used for accessing first alternating current; the first rectifying and filtering circuit is used for converting the first alternating current into a first direct current; a conversion circuit for modulating the first direct current to output a second alternating current; the second rectifying and filtering circuit is used for converting the second alternating current into second direct current; the charging output interface is used for outputting second direct current; a control circuit for controlling the conversion circuit; the second rectifying and filtering circuit includes: a rectifier circuit including a rectifier diode; a filter circuit comprising an electrolytic capacitor assembly for storing energy; wherein, the ratio of the total capacity of the electrolytic capacitor component to the output power of the charger is more than or equal to 2.8uF/W and less than or equal to 4.0 uF/W.
In some embodiments, the ratio of the total volume of the electrolytic capacitor assembly to the output power of the charger is greater than or equal to 5mm3W is not more than 20mm3/W。
In some embodiments, the conversion circuit comprises: a transformer; the switch circuit is connected to the first rectifying and filtering circuit and the transformer; the switching circuit comprises a switching element, the switching element comprises a control end electrically connected with the control circuit, and the control circuit controls the switching element to be conducted at a switching frequency which is greater than or equal to 150kHz and less than or equal to 1000 kHz.
In some embodiments, the excitation inductance of the transformer is equal to or greater than 140uH and equal to or less than 200 uH.
In some embodiments, the output voltage of the charger is 10V or more and 100V or less.
The utility model discloses an useful part lies in: the charger in the charging system has small volume and light weight, is convenient for a user to carry and reduces the cost.
Drawings
Fig. 1 is a perspective view of a power tool system of a first embodiment;
FIG. 2 is an exploded view of the charging system in the power tool system of FIG. 1;
fig. 3 is another perspective view of the charging system of fig. 2;
FIG. 4 is a perspective view of the battery pack of FIG. 3 with a portion of the battery pack housing removed;
fig. 5 is a circuit diagram of the charging system of fig. 2;
fig. 6 is a perspective view of the main body of the charger in fig. 2 with a part of the charger housing cut away;
fig. 7 is a perspective view of the main body of the charger in fig. 2 with another portion of the charger housing cut away;
fig. 8 is a perspective view of the charging system of fig. 1 further including a second battery pack;
FIG. 9 is a circuit diagram of the charger of FIG. 1;
fig. 10 is a perspective view of a charging system of the second embodiment;
fig. 11 is an exploded view of the charging system of fig. 10;
fig. 12 is another exploded view of the charging system of fig. 10;
fig. 13 is a perspective view of a charging system of the third embodiment;
fig. 14 is an exploded view of the charging system shown in fig. 13;
fig. 15 is another exploded view of the charging system shown in fig. 13;
fig. 16 is a circuit diagram of the charging system shown in fig. 13;
fig. 17 is a perspective view of a charging system of the fourth embodiment;
fig. 18 is an exploded view of the charging system shown in fig. 17;
fig. 19 is another exploded view of the charging system shown in fig. 17;
fig. 20 is a perspective view of the charging system of the fifth embodiment.
Detailed Description
The electric power tool system 100 of the first embodiment shown in fig. 1 includes: a charging system 10a and a power tool 10 b. The power tool 10b may be a torque output type tool such as a drill, a screwdriver, a hammer, a wrench, a blender, etc. The power tool 10b may also be a saw-type tool, such as an electric circular saw, a reciprocating saw, a jig saw, a band saw, a table cutter, a miter saw, or the like. The power tool 10b may also be an abrasive type tool such as an angle grinder, a sander, an abrasive belt machine, or the like. The power tool 10b may also be a garden tool, such as a lawn mower, a pruner, a chain saw, a blower, or the like. Of course, the power tool 10b may also be a light, a snow blower, or the like. In fact, the electric tool system 100 adopting the following essential contents of the present invention is the technical solution protected by the present invention.
As shown in fig. 1 to 3, the charging system 10a includes a charger 10 and a battery pack 20, and the battery pack 20 is used to supply power to the power tool 10 b. In the present embodiment, the battery pack 20 is provided independently of the power tool 10 b. The battery pack 20 is detachably connected to the power tool 10 b. When it is desired to work with the power tool 10b, a user may plug the battery pack 20 into the power tool 10b to power the power tool 10 b. When the power tool 10b is not in use or the battery pack 20 is low in power, the user can detach the battery pack 20 from the power tool 10 b.
The power tool 10b is formed with a tool interface 10c, and the battery pack 20 is formed with a battery pack interface 21, the battery pack interface 21 being adaptable to the tool interface 10 c. When the battery pack 20 is mounted to the power tool 10b, the battery pack interface 21 and the tool interface 10c form a mechanical connection to ensure that the battery pack 20 does not detach from the power tool 10 b. The battery pack 20 is also electrically connected to the tool interface 10c such that the battery pack 20 is electrically connected to the power tool 10 b.
As shown in fig. 3 and 4, the battery pack 20 includes a pack case 22 and an electric core assembly 23. The battery pack case 22 is formed around the first receiving cavity 221, and the battery cell assembly 23 is disposed inside the battery pack case 22. The battery pack interface 21 is formed on the battery pack shell 22, the battery pack interface 21 is provided with a plurality of battery pack pole pieces, and the battery pack pole pieces are electrically connected with the electric core assembly 23. The battery assembly 23 includes a plurality of battery cell units 231a, the number of the battery cell units 231a is greater than or equal to 3, and the nominal voltage of the battery pack 20 is greater than or equal to 10V and less than or equal to 100V. It is of course understood that the number of the cell units 231a is not limited to 3. In the present embodiment, the number of the cell units 231a is 10, 5 cell units 231a form one cell unit group 231, the cell assembly 23 includes two cell unit groups 231, the cell units 231a in each cell unit group 231 form a series connection, and the two cell unit groups 231 form a parallel connection therebetween. Each cell unit group 231 includes 5 cell units 231 a. In this embodiment, the nominal voltage of the battery pack 20 is 20V.
In some embodiments, the nominal voltage of the battery pack may be greater than or equal to 10V and less than or equal to 20V, for example, the nominal voltage of the battery pack may be 12V, 18V, 20V, etc. In some other embodiments, the nominal voltage of the battery pack may be greater than or equal to 20V and less than or equal to 100V, for example, the nominal voltage of the battery pack may be 24V, 40V, 56V, 80V, etc. In some embodiments, the number of the cell units included in one cell unit group may be greater than or equal to 3 and less than or equal to 5, for example, the number of the cell units included in one cell unit group may be 3, 4, or 5. In some embodiments, the number of the cell units included in one cell unit group may be greater than or equal to 6 and less than or equal to 25, for example, the number of the cell units included in one cell unit group may be 6, 10, 14, 20, and the like.
In some embodiments, the battery pack may include only one cell unit group, so that the volume of the battery pack may be small. In some embodiments, the battery pack may further include three cell unit groups or four cell unit groups, so that the capacity of the battery pack may be increased, and the endurance time of the battery pack may be prolonged. In this example, the capacity of the battery pack is 1.5Ah or more and 20Ah or less.
The cell unit 231a is a cylindrical cell, and further, the cell unit 231a is a cylindrical lithium cell. In the present embodiment, the cell units 231a are 18650 lithium cells, the weight of each cell unit 231a is greater than or equal to 35g and less than or equal to 55g, and the capacity of each cell unit 231a is greater than or equal to 1200mAh and less than or equal to 3600 mAh.
In other embodiments, the cell units may also be 21700 lithium cells, each cell unit having a weight of greater than or equal to 60g and less than or equal to 75g, and each cell unit having a capacity of greater than or equal to 3000mAh and less than or equal to 5000 mAh.
The 18650 lithium battery cell or the 21700 lithium battery cell is adopted by the battery pack 20, so that the capacity of the battery pack 20 is relatively high, and the battery pack is more suitable for supplying power to the electric tool 10 b.
The charger 10 is used to charge the battery pack 20, and when the battery pack 20 is low, the charger 10 can be connected to the power grid to charge the battery pack 20.
As shown in fig. 2 to 7, the charger 10 includes: main part 11 and connecting wire 12, main part 11 includes: the charger housing 111, the charging input interface 112, and the circuit board assembly 113, the connecting wire 12 includes a first end 121 and a second end 122, the first end 121 is connected to the main body 11, the second end 122 forms a charging output interface 122a, and the charging output interface 122a is used for connecting with the battery pack 20. The charger housing 111 surrounds a second receiving chamber 111a formed to receive a circuit board assembly 113, and the circuit board assembly 113 is disposed in the second receiving chamber 111 a. The circuit board assembly 113 is electrically connected to the charging input interface 112 and the charging output interface 122 a. The charging input interface 112 is mounted to the charger housing 111. In the present embodiment, the charging input interface 112 includes a positive pole piece and a negative pole piece, both of which are fixedly mounted to the charger housing 111. The connection cord 12 is connected to the charger case 111. The connecting wire 12 may be detachably connected to the charger housing 111, and the charger housing 111 has a connecting hole 111b formed therein, and the first end 121 is inserted into the connecting hole 111 b.
The charger 10 further includes: a charging control circuit 13, wherein the charging control circuit 13 is used for controlling the charger 10 to output a voltage matched with the battery pack 20 to charge the battery pack 20, so that the output voltage of the charging output interface 122a is the same as the nominal voltage of the battery pack 20. The charge control circuit 13 is provided in the charger case 111, and the charge control circuit 13 is disposed on the circuit board assembly 113. In other embodiments, the charge control circuit may also be disposed within the battery pack.
In this embodiment, the second end 122 of the connecting cable 12 is detachably connected to the battery pack 20, and the battery pack 20 includes a battery pack input interface 24 for connecting with the charging output interface 122 a. In this embodiment, the battery pack input interface 24 is a different interface from the battery pack interface 21, the battery pack input interface 24 is used for connecting with the charger 10, and the battery pack interface 21 is used for connecting with the power tool 10b to supply power to the power tool 10 b. Of course, it will be appreciated that in other implementations, the battery pack interface and the battery pack input interface may be the same interface. When the charging output interface 122a is connected to the battery pack input interface 24, the charger 10 can obtain the nominal voltage of the battery pack 20, so that the charging control circuit 13 can control the circuits inside the charger 10 so that the charging output interface 122a outputs the direct current having the same voltage value as the nominal voltage of the battery pack 20.
The first end 121 of the connection line 12 also forms a charging output interface 121a, and the charging output interface 121a has the same structure as the charging output interface 122a of the second end 122. In this way, the user may also connect the first end 121 of the connecting cord 12 with the battery pack 20 and the second end 122 with the main body 11. Accordingly, the user may not need to distinguish which end of the connection cord 12 is connected to the battery pack 20, thereby improving the convenience of operation.
In the present embodiment, the charging system 10a includes a battery pack 20, and the battery pack 20 may be defined as a first battery pack. As shown in fig. 8, the charging system 10a includes the battery pack 20 and further includes a second battery pack 30. The second battery pack 30 is formed with a second battery pack input interface 34. When the charging output interface 122a is connected to the battery pack input interface 24 of the battery pack 20, and the charger 10 recognizes the nominal voltage of the battery pack 20, the charging control circuit 13 controls the charging output interface 122a of the charger 10 to output the dc power having the first voltage value identical to the nominal voltage of the battery pack 20 according to the recognized nominal voltage. When the charging output interface 122a is connected to the second battery pack input interface 34 of the second battery pack 30, the charger 10 recognizes the second nominal voltage of the second battery pack 30, and the charging control circuit 13 controls the charging output interface 122a of the charger 10 to output the dc power having the second voltage value identical to the second nominal voltage according to the recognized second nominal voltage. The nominal voltage is greater than the first nominal voltage, the first voltage value is different from the second voltage value, and the first voltage value is greater than the second voltage value. In this way, the charger 10 can output the direct current having the first voltage value and also output the direct current having the second voltage value, so that the adaptability of the charger 10 can be improved. The battery packs 20 having different nominal voltages can be charged by one charger 10, reducing the use cost and convenience of the user.
As shown in fig. 5 and 9, the charger 10 further includes a charging circuit 14 provided between the charging input interface 112 and the charging control circuit 13. The charging circuit 14 is used to convert alternating current to direct current, and the circuit board assembly 113 carries at least part of the charging circuit 14. The charging control circuit 13 is used to control the charging circuit 14 so that the charger 10 outputs the same dc power as the nominal voltage of the battery pack 20. The charging circuit 14 includes: EMI filter circuit 141, first rectifying filter circuit 142, converting circuit 15, second rectifying filter circuit 143, sampling circuit 144, compensation feedback circuit 145 and control circuit 146. An EMI filter circuit 141, a first rectifying and filtering circuit 142, a conversion circuit 15, a second rectifying and filtering circuit 143, a sampling circuit 144, a compensation feedback circuit 145, and a control circuit 146 are disposed at least partially on the circuit board assembly 113.
In the present embodiment, the charging input interface 112 of the charger 10 is used for connecting to the power grid to receive the first ac power in the power grid into the charger 10.
The EMI filter circuit 141 is used to prevent ac signals of other frequencies in the grid from interfering with the charger 10 and the battery pack 20. The EMI filter circuit 141 is electrically connected to the charging input interface 112, and the EMI filter circuit 141 is disposed between the charging input interface 112 and the first rectifying and filtering circuit 143. The EMI filter circuit 141 allows a first ac power having a predetermined frequency in the power grid to be input to the charger 10, and also reduces electromagnetic interference to the outside.
The first rectifying and smoothing circuit 142 is disposed between the EMI smoothing circuit 141 and the conversion circuit 15, and the first rectifying and smoothing circuit 142 is configured to convert the first alternating current into a first direct current. The first rectifying and filtering circuit 142 specifically includes a first rectifying circuit and a first filtering circuit. The first rectifying circuit is used for converting the first alternating current into pulsating direct current. In this embodiment, the first rectifying circuit may be a full bridge rectifying circuit. The first filter circuit is used for converting pulsating direct current into smooth direct current.
The conversion circuit 15 is configured to modulate the first direct current to output a second alternating current. The conversion circuit 15 specifically includes: a switching circuit 151, a transformer 152, and a driving circuit 153. The switching circuit 151 is connected between the first rectifying and smoothing circuit 142 and the transformer 152. The switching circuit 151 is configured to modulate the first direct current output by the first rectifying and filtering circuit 142 and output the modulated direct current to the transformer 152, and the transformer 152 changes the voltage of the modulated direct current to output the second alternating current. The driving circuit 153 is used for driving the switching circuit 151 to be turned on or off.
The switching circuit 151 includes a switching element 151a, and the switching element 151a is a power switch. The switching element 151a includes a control terminal 151b connected to a driving circuit 153, and the driving circuit 153 can drive whether or not the switching element 151a is turned on. In the present embodiment, the switching element 151a and the driving circuit 153 are integrated into one chip 16, and the chip 16 is mounted on the circuit board assembly 113.
In the present embodiment, the switching element 151a can be switched at a switching frequency of 150kHz or more and 1000kHz or less. Thus, the switching element 151a can be turned on and off at a switching frequency of 150kHz or more and 1000kHz or less. The switching frequency of the switching element 151a is set to be relatively large, so that the volume and weight of other electronic components such as capacitors and inductors in the charger 10 are greatly reduced, thereby facilitating the reduction of the volume and weight of the charger 10. Further, the switching element 151a can be switched at a switching frequency of 150kHz or more and 500kHz or less.
The switching frequency of the switching element 151a is set within a reasonable range, and the charger 10 can be made smaller in size with a larger output power. Specifically, in the present embodiment, the ratio of the output power of the charger 10 to the volume of the charger case 111 is 0.3W/cm or more3And is less than or equal to 1.2W/cm3. Alternatively, in some embodiments, the volume of the charger 10 is smaller than the volume of the battery pack 20, and the ratio of the output power of the charger 10 to the volume of the charger housing 111 is greater than or equal to 0.4W/cm3And is less than or equal to 0.8W/cm3. The output power of the charger 10 refers to the rated output power of the charger 10. The volume of the charger housing 111 may be the product of the length, width, and height of the charger housing 111.
Watch 1
| Model number | Switching frequency (kHz) | Output power (W) | Volume (cm)3） | Output power/volume (W/cm)3） |
| DC18RE | Less than 150 | 42 | 3073 | 0.014 |
| Sample 1 | Greater than 150 | 65 | 96 | 0.68 |
| Sample 2 | Greater than 150 | 40 | 90 | 0.44 |
As shown in Table I, the ratio of the output power of the conventional DC18RE charger to the volume of the charger housing is 0.014W/cm3The charger is large in size. And the ratio of the output power of the corresponding sample 1 of the charger to the volume of the charger shell is 0.68W/cm3The ratio of the output power of sample 2 to the volume of the charger case was 0.44W/cm3. Thus, the volume of the charger 10 is much smaller than that of the existing charger, and the volume utilization rate of the charger is improved.
The switching frequency of the switching element 151a is set within a reasonable range, and the charger 10 can have a small weight even with a large output power. Specifically, in the present embodiment, the ratio of the output power of the charger 10 to the weight of the charger 10 is 0.2W/g or more and 1W/g or less. Alternatively, in some embodiments, the weight of the charger 10 is less than the weight of the battery pack 20, and the ratio of the output power of the charger 10 to the weight of the charger 10 is greater than or equal to 0.3W/g and less than or equal to 0.8W/g. Alternatively, in some embodiments, the ratio of the output power of the charger 10 to the weight of the charger 10 is greater than or equal to 0.4W/g and less than or equal to 0.8W/g. In the present embodiment, the ratio of the weight of the charger 10 to the weight of one cell unit 231a is equal to or greater than 1.5 and equal to or less than 3.4, and the ratio of the volume of the charger case 111 to the volume of one cell unit 231a is equal to or greater than 4 and equal to or less than 8. In some embodiments, the ratio of the weight of the charger 10 to the weight of one cell unit 231a is greater than 1.5 and equal to or less than 3, and the ratio of the volume of the charger housing 111 to the volume of one cell unit 231a is greater than or equal to 6 and equal to or less than 7.5.
Watch two
| Model number | Switching frequency (kHz) | Output power (W) | Weight (g) | Output Power/weight (W/g) |
| WA3854 | Less than 150 | 22 | 270 | 0.08 |
| DEVON5340 | Less than 150 | 75 | 670 | 0.11 |
| Sample 3 | Greater than 150 | 65 | 100 | 0.65 |
| Sample No. 4 | Greater than 150 | 40 | 98 | 0.42 |
As shown in Table two, the ratio of the output power of the conventional WA3854 charger to the weight of the charger is 0.08W/g, and the weight of the charger is large. The ratio of the output power of the DEVON5340 charger to the weight of the charger is 0.11W/g, and the weight of the charger is large. And the utility model discloses a charger's the output of the sample 3 that corresponds is 0.65W/g with the ratio of weight, and the output of sample 4 is 0.42W/g with the ratio of weight. Thus, the weight of the charger 10 is much less than prior art chargers.
In the present embodiment, the charging output interface 122a of the charger 10 can output an output voltage of 5V or more and 21V or less. Thus, for the battery packs 20 with the nominal voltage of 5V or more and 21V or less, the battery packs 20 include two cell unit groups 231, the ratio of the weight of the charger 10 to the weight of the battery pack 20 is 0.1 or more and 0.7 or less, and the ratio of the volume of the charger housing 111 to the volume of the battery pack 20 is 0.1 or more and 0.5 or less. Further, the ratio of the weight of the charger 10 to the weight of the battery pack 20 is 0.1 or more and 0.4 or less, and the ratio of the volume of the charger case 111 to the volume of the battery pack 20 is 0.1 or more and 0.3 or less.
The transformer 152 is disposed between the switching circuit 151 and the second rectifying and smoothing circuit 143. The excitation inductance of the transformer 152 is 140uH or more and 200uH or less. The switching frequency of the switching element 151a is set higher, and the magnetizing inductance of the transformer 152 can be set smaller, so that the volume of the transformer 152 can be reduced.
The second rectifying and filtering circuit 143 is connected between the transformer 152 and the charging output interface 122a, and is configured to rectify and filter the second ac power output by the transformer 152, so as to convert the second ac power into a second dc power. The charging output interface 122a outputs the second direct current to the battery pack 20. The second rectifying and smoothing circuit 143 includes a second rectifying circuit 143a and a second smoothing circuit 143 b. A second rectifying circuit 143a for converting the second alternating current into pulsating direct current, and a second filter circuit 143b for converting the pulsating direct currentThe electricity is converted to a smooth direct current. In the present embodiment, the second rectification circuit 143a is a half-wave rectification circuit, and the second rectification circuit 143a includes a diode. The second filter circuit 143b comprises an electrolytic capacitor component 143c for energy storage, the ratio of the total capacity of the electrolytic capacitor component 143c to the output power of the charger 10 is greater than or equal to 2.8uF/W and less than or equal to 4.0uF/W, and the ratio of the total capacity of the electrolytic capacitor component 143c to the output power of the charger 10 is greater than or equal to 5mm3W is not more than 20mm3and/W. Thus, when the output power of the charger 10 is relatively large, the total capacity and the total volume of the electrolytic capacitor assembly 143c can be reduced, thereby reducing the volume of the charger 10 and the weight of the charger 10. Further, the ratio of the total capacity of the electrolytic capacitor assembly 143c to the output power of the charger 10 is greater than or equal to 3uF/W and less than or equal to 3.5uF/W, and the ratio of the total volume of the electrolytic capacitor assembly 143c to the output power of the charger 10 is greater than or equal to 5mm3W is not more than 10mm3/W。
In the embodiment, the electrolytic capacitor assembly 143c is disposed on the circuit board assembly 113, and the electrolytic capacitor assembly 143c includes two electrolytic capacitors connected in parallel, so that the space inside the charger housing 111 can be effectively utilized, and the structure is more compact.
The sampling circuit 144 may be a voltage sampling circuit or a current sampling circuit. The sampling circuit 144 is connected to a circuit between the second rectifying and filtering circuit 143 and the charging output interface 122 a. The voltage sampling circuit can collect the voltage of the second direct current output by the second rectifying and filtering circuit 143, and the current sampling circuit can collect the current of the second direct current output by the second rectifying and filtering circuit 143.
The sampling circuit 144 is also electrically connected to the compensation feedback circuit 145. The compensation feedback circuit 145 is configured to compare the current or voltage collected by the sampling circuit 144 with a nominal voltage of the battery pack 20 and generate an error signal, and the compensation feedback circuit 145 amplifies and compensates the error signal to generate a feedback signal, and feeds the feedback signal back to the control circuit 146.
The control circuit 146 is used to control the conversion circuit 15. The control circuit 146 is connected to the control terminal 151b of the switching element 151a to control the switching element 151a to be turned on. The control circuit 146 controls the switching frequency of the switching element 151a such that the switching element 151a is switched at a switching frequency of 150kHz or more and 1000kHz or less. In the present embodiment, the control circuit 146 is electrically connected to the control terminal 151b of the switching element 151a through the driving circuit 153. The control circuit 146 transmits a control signal to the drive circuit 153, and the drive circuit 153 amplifies the control signal to drive the switching element 151a to be turned on.
The conversion circuit 15 is controlled in a closed loop by the sampling circuit 144, the compensation feedback circuit 145 and the control circuit 146, so that the output voltage of the charging output interface 122a is finally the same as the nominal voltage of the battery pack 20.
In the present embodiment, the switching frequency of the switching element 151a is large, and the heat generation power of the switching element 151a is reduced by the soft switching technique. The charger 10 does not generate much heat during operation, so that no heat dissipation fan may be disposed in the charger housing 111, and the volume and weight of the charger 10 may be further reduced. The charger housing 111 may also be made in a closed structure, and an air opening for heat dissipation does not need to be provided on the charger housing 111, thereby improving the waterproof performance of the charger 10.
The charging system 40a shown in fig. 10 to 12 includes a battery pack 41 and a charger 42. The conventional battery pack 41 is usually provided with only the battery pack interface 411, and in order to supply power to the battery pack 41 without changing the structure of the battery pack 41, the charging system 40a further includes an adapter 43 for connecting the charger 42 and the battery pack 41. The adapter 43 includes an adapter output interface 431 for electrical connection with the battery pack 41, and the adapter output interface 431 can mate with the battery pack interface 411. That is, the battery pack interface 411 can be connected not only to the electric power tool but also to the adapter 43. Thus, the applicable range of the charger 42 can be wider. The adapter 43 further includes an adapter input interface 432, and the adapter input interface 432 is used for electrically connecting with the charging output interface 421a of the connection cord 421. The second end 421b of the connection cord 421 can also be detachably connected to the adapter input interface 432, so as to facilitate the user. The ratio of the weight of the charger 42 to the weight of the adapter 43 is 0.8 or more and 1.5 or less, so that both the weight of the charger 42 and the weight of the adapter 43 are reduced.
Similarly, the first end 421c of the connection line 421 also forms a charging output interface 421d, the charging output interface 421d can be connected to the adapter 43, and the second end 421b can be connected to the main body 422. Thus, the user can be freed from any connection of which end of the connection wire 421 is connected to the adapter 43, thereby improving the convenience of operation.
Thus, a charge control circuit may be provided within the adapter 43 that causes the adapter output interface 431 to output a charge voltage that is the same as the nominal voltage of the battery pack 41.
The connection cord 511 in the charging system 50a of the third embodiment shown in fig. 13 to 16 is fixedly connected to the main body 512 of the charger 51, and the user cannot detach the connection cord 511 from the main body 512. The first end 511a of the connection line 511 is fixedly connected with the main body 512 of the charger 51, the second end 511b of the connection line 511 forms a charging output interface 511c, and the charging output interface 511c is detachably connected with the adapter 52. A charging circuit 513 for converting alternating current into direct current is provided between the charging input interface 512a and the charging output interface 511 c. The charger 51 includes a charging circuit 513 similar to the charging circuit 14 of fig. 5. The charging output interface 511c is connected to the adapter input interface 521, the charging control circuit 522 may be provided in the adapter 52, and the charging control circuit 522 is connected between the adapter input interface 521 and the adapter output interface 523. Adapter output interface 523 mates with battery pack input interface 531 to charge battery pack assembly 532.
A charging system 60a of the fourth embodiment shown in fig. 17 to 19 includes a charger 61 and a battery pack 62. The charging output interface 611 of the charger 61 is matched with the battery pack interface 621 of the battery pack 62, so that a connecting line is not required to be arranged between the charger 61 and the battery pack 62. When the battery pack 62 is short of power, the battery pack interface 621 is connected to the charging output interface 611, and the charger 61 can charge the battery pack 62. When the power tool is required to work, the battery pack interface 621 is connected with the tool interface, and the battery pack 62 can supply power to the power tool. The charger 61 in the present embodiment also includes a charging circuit similar to the charging circuit 14 in fig. 5.
A charging system 70a of the fifth embodiment shown in fig. 20 includes a charger 71, a first battery pack 72, and a second battery pack. The charger housing 711 of the charger 71 is formed with a first charging output interface 711a and a second charging output interface 711b, the first battery pack 72 includes a first battery pack interface 721 adapted to the first charging output interface 711a, and the second battery pack 73 includes a second battery pack interface 731 adapted to the second charging output interface 711 b. The charger 71 in this embodiment also includes a charging circuit similar to the charging circuit 14 in fig. 5.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (10)
1. A charger, comprising:
the charging input interface is used for accessing first alternating current;
the first rectifying and filtering circuit is used for converting the first alternating current into a first direct current;
a conversion circuit for modulating the first direct current to output a second alternating current;
the second rectifying and filtering circuit is used for converting the second alternating current into second direct current;
the charging output interface is used for outputting the second direct current;
a control circuit for controlling the conversion circuit;
the method is characterized in that:
the second rectifying and filtering circuit comprises:
a rectifier circuit including a rectifier diode;
a filter circuit comprising an electrolytic capacitor assembly for storing energy;
wherein the ratio of the total capacity of the electrolytic capacitor assembly to the output power of the charger is greater than or equal to 2.8uF/W and less than or equal to 4.0 uF/W.
2. The charger of claim 1, wherein:
the ratio of the total volume of the electrolytic capacitor assembly to the output power of the charger is more than or equal to 5mm3W is not more than 20mm3/W。
3. The charger of claim 1, wherein:
the conversion circuit includes:
a transformer;
a switching circuit connected to the first rectifying and filtering circuit and the transformer;
the switching circuit comprises a switching element, the switching element comprises a control end electrically connected with the control circuit, and the control circuit controls the switching element to be conducted at a switching frequency which is greater than or equal to 150kHz and less than or equal to 1000 kHz.
4. The charger of claim 3, wherein:
the excitation inductance of the transformer is greater than or equal to 140uH and less than or equal to 200 uH.
5. The charger of claim 1, wherein:
the output voltage of the charger is greater than or equal to 10V and less than or equal to 100V.
6. A charging system comprises a battery pack and a charger for charging the battery pack, wherein the battery pack comprises a cell assembly for storing electric energy, the cell assembly comprises cell units, and the number of the cell units is more than or equal to 3; the charger includes:
the charging input interface is used for accessing first alternating current;
the first rectifying and filtering circuit is used for converting the first alternating current into a first direct current;
a conversion circuit for modulating the first direct current to output a second alternating current;
the second rectifying and filtering circuit is used for converting the second alternating current into second direct current;
the charging output interface is used for outputting the second direct current;
a control circuit for controlling the conversion circuit;
the second rectifying and filtering circuit comprises:
a rectifier circuit including a rectifier diode;
a filter circuit comprising an electrolytic capacitor assembly for storing energy;
wherein the ratio of the total capacity of the electrolytic capacitor assembly to the output power of the charger is greater than or equal to 2.8uF/W and less than or equal to 4.0 uF/W.
7. The charging system according to claim 6, wherein:
the ratio of the total volume of the electrolytic capacitor assembly to the output power of the charger is more than or equal to 5mm3W is not more than 20mm3/W。
8. The charging system according to claim 6, wherein:
the conversion circuit includes:
a transformer;
a switching circuit connected to the first rectifying and filtering circuit and the transformer;
the switching circuit comprises a switching element, the switching element comprises a control end electrically connected with the control circuit, and the control circuit controls the switching element to be conducted at a switching frequency which is greater than or equal to 150kHz and less than or equal to 1000 kHz.
9. The charging system according to claim 8, wherein:
the excitation inductance of the transformer is greater than or equal to 140uH and less than or equal to 200 uH.
10. The charging system according to claim 6, wherein:
the output voltage of the charger is greater than or equal to 10V and less than or equal to 100V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023062185.9U CN214479791U (en) | 2020-12-18 | 2020-12-18 | Charger and charging system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023062185.9U CN214479791U (en) | 2020-12-18 | 2020-12-18 | Charger and charging system |
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| CN214479791U true CN214479791U (en) | 2021-10-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022127885A1 (en) * | 2020-12-18 | 2022-06-23 | 南京泉峰科技有限公司 | Charging system and charger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022127885A1 (en) * | 2020-12-18 | 2022-06-23 | 南京泉峰科技有限公司 | Charging system and charger |
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