CN107276156B - Power supply system capable of self-adjusting voltage - Google Patents
Power supply system capable of self-adjusting voltage Download PDFInfo
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- CN107276156B CN107276156B CN201710475247.2A CN201710475247A CN107276156B CN 107276156 B CN107276156 B CN 107276156B CN 201710475247 A CN201710475247 A CN 201710475247A CN 107276156 B CN107276156 B CN 107276156B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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Abstract
The invention discloses a power supply system capable of self-adjusting voltage, which comprises a battery pack with a plurality of unit batteries, a tool identification circuit, an electronic switch arrangement combination circuit, a control circuit and a tool interface. The battery pack is provided with a plurality of battery combinations, each battery combination is formed by connecting the same number of unit batteries in series, and the tool identification circuit is connected with the control circuit and used for identifying the voltage platform type of the tool when the power supply system is connected to the electric tool; the tool interface also comprises at least one identification terminal which is connected with the tool identification circuit. The electronic switch permutation and combination circuit is provided with a plurality of electronic switches. The control circuit controls the electronic switch arrangement combination circuit arranged between the battery combinations according to the identification result of the tool identification circuit to adjust the power output of the battery pack and output the power through the tool interface. The power supply system of the invention can simplify the problem of power supply switching between low-voltage and high-voltage electric tools.
Description
Technical Field
The invention relates to the technical field of power supply systems of electric tools, in particular to a power supply system capable of self-adjusting voltage.
Background
With the popularization and development of the dc tools in the power tool industry and the use of different operating conditions, more and more voltage platform tools, such as dc tools with various voltage platforms, 18V, 20V, 36V, 40V, 60V, etc., have gradually appeared in tool design. And the cooperation use of multi-voltage tools also appears in the terminal use scene, for example handheld electric drill, gardens grass cutter etc. demand simultaneously in same application scene, lack the battery package that can set up the instrument automatically and adjust output voltage according to the instrument characteristic in the existing market. If the low-voltage handheld tool and the high-voltage garden tool can share the same battery power supply system, the use convenience of the tool for the end user is improved, and the purchase cost is greatly reduced.
Disclosure of Invention
To solve the above problems, the present invention proposes a power supply system capable of self-regulating voltage according to the detected external tool platform voltage type, which can simplify the power supply switching problem between low-voltage and high-voltage power tools.
To achieve the above object, the present invention provides a self-regulated voltage power supply system, which includes a battery pack having a plurality of unit cells, a tool recognition circuit, an electronic switch arrangement circuit, a control circuit, and a tool interface, wherein:
the battery pack is provided with a plurality of groups of battery combinations formed by the unit batteries, each battery combination is formed by connecting the same number of unit batteries in series and defines a positive voltage end and a negative voltage end of the battery combination, and the positive voltage end and the negative voltage end are both connected to the electronic switch arrangement combination circuit;
the tool identification circuit is connected with the control circuit and used for identifying the voltage platform type of the tool when the power supply system is connected to the electric tool;
the control circuit controls an electronic switch arrangement combination circuit arranged between the battery packs according to the identification result of the tool identification circuit to adjust the power output of the battery pack and output the power through a tool interface, wherein the electronic switch arrangement combination circuit is provided with a plurality of electronic switches;
the tool interface also comprises at least one identification terminal which is connected with the tool identification circuit.
In summary, compared with the prior art, the invention effectively solves the problem that tools with different voltage platforms share a battery power supply system, so that the power supply system can automatically adjust the voltage and actively adapt to complete machines with different voltage platforms, thereby improving the convenience of using the tools of terminal users and greatly reducing the purchase cost.
Drawings
Fig. 1 is a schematic diagram of a self-regulated voltage power supply system according to an embodiment of the present invention.
Fig. 2 is a schematic connection diagram of the battery pack and the electronic switch arrangement circuit in fig. 1.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
Fig. 1 is a functional block diagram of a self-regulated voltage power supply system according to an embodiment of the present invention, as shown in fig. 1, the power supply system includes a battery pack 110, a tool recognition circuit 120, a control circuit 130, a tool interface 140, and an electronic switch arrangement circuit 150. Such power supply systems are intended to provide a power supply for power tools (also called power tools), in particular cordless power tools, which may be any type of power tool, including but not limited to: electric drills, screwdrivers, impact drills, impact wrenches, electric hammers, electric circular saws, miter saws, reciprocating saws, band saws, cutting tools, sanders, illuminators, vibrators, pruners, lawn mowers, hair dryers, compressed air machines, etc., in some particular instances, the electric tool powered by the power supply system of embodiments of the present invention is one or more of the foregoing. The power supply system is removably coupled to the power tool to provide a supply of power thereto.
The battery pack 110 has a plurality of unit cells 101 (also referred to as cells), is attached together to form a battery assembly 102, and defines a positive voltage terminal and a negative voltage terminal of the battery assembly 102. Such attachments may be in series, parallel, and combinations thereof.
In the particular example shown in fig. 1 and 2, in the battery pack 102, 5 unit cells 101 are connected together in series.
In particular, a plurality of such battery packs 102 may be included in one battery pack 110. In the example shown in fig. 2, the battery pack 110 has 2 such battery assemblies 102. The number of unit cells included in each battery pack 102 is the same. As such, and as will be described in greater detail below, the selection of the connection of these different battery packs 102 allows for different voltage and/or current outputs from the battery pack to facilitate automatic adaptation and adjustment of the multi-voltage platform power tool.
The unit cell 101 is preferably a rechargeable secondary battery, such as a nickel metal hydride battery, a lithium-based battery, or the like.
The tool interface 140 of the power supply system, as shown in fig. 1, has at least one pair of positive 141 and negative 142 terminals, for example, which are received in slots in the battery pack or the housing of the power supply system, and when the power supply system is inserted and connected in place, typically corresponding terminals on the power tool will be connected to the pair of positive and negative terminals to provide power to the power tool through the positive and negative terminals during operation of the power tool.
The power supply system can in particular identify the type of platform of the power tool connected (electrically connected) to it in order to determine and automatically adapt the supply voltage and/or current level of the power supply system. In particular, at least one identification terminal 103 (S-terminal) is provided in the tool interface 140 as a tool detection terminal for identifying the voltage platform type of the tool by means of the tool identification circuit when connected to the power tool.
For example, as shown in the specific embodiment of fig. 1, the identification terminal 103 is disposed between the positive terminal 141 and the negative terminal 142 of the two power output terminals, but may be disposed at other locations where it is easy to mechanically, electrically and cooperatively engage with the power tool.
As shown in fig. 1, the power supply system has a tool identification circuit 120 electrically connected to the identification terminal 103 for identifying the voltage platform types of the external power tool connected to the power supply system, such as 18V, 20V, 36V, 40V, 48V, 60V, and other different voltage platform types.
The tool identification circuit 120 may be implemented by a voltage detection circuit, a magnetic sensor, or the like in an alternative embodiment, and in the particular example shown in the figure, an ID resistance identification sampling circuit is used as an identification circuit to perform sampling segmentation identification on the voltage platform of the electric tool.
The tool recognition circuit 120 is connected to a control core control circuit 130 of the power supply system. The control circuit 130 may be implemented by a circuit and/or a chip and/or a component having calculation and processing functions, such as a single chip, an MCU, and the like. In the foregoing embodiment, the MCU is preferably adopted for implementation.
The control circuit 130 controls the adaptive adjustment of the output voltage and/or the output current of the battery pack 110 according to the recognition result of the tool recognition circuit 120.
As shown in fig. 1 and 2, the battery pack 102 of the battery pack 110 is connected to the electronic switch bank circuit 150, and is disposed between the positive voltage terminal and the negative voltage terminal of different battery packs, and the connection form between the plurality of battery packs 102 is realized by the combination of on and off of the plurality of electronic switches (SW1, SW2, SW3, SW4, SW5) of the electronic switch bank circuit, so as to change the power output, i.e., the output voltage and/or current, of the battery pack 110.
The electronic switch permutation and combination circuit comprises a plurality of electronic switches (SW1, SW2, SW3, SW4 and SW5), and each electronic switch is independently controlled to be switched on and off by the control circuit 130.
Referring to fig. 1 and 2, the positive terminal and the negative terminal of each cell assembly 102 are configured to be connected to an electronic switch arrangement assembly circuit 150.
In some embodiments of the present invention, the control circuit 130, the tool recognition circuit 120, and the electronic switch permutation and combination circuit 150 may be disposed independently, for example, separate control circuit boards may be designed, or at least 2 of them may be integrated on one control circuit board in an integrated manner.
In the particular example shown in fig. 2, taking a battery pack having 2 battery assemblies as an example, equal strings of unit cells are arranged in 2 battery assemblies 102, for example, 2 unit cells are connected in series, each battery assembly 102 is relatively independent, and the positive and negative poles ("+"/") of each battery assembly 102 are individually connected to an electronic switch permutation and combination circuit 150 (for example, an electronic switch permutation and combination circuit control circuit board or a control circuit board of an integrated electronic switch permutation and combination circuit). Thus, the control circuit board will have 2 sets of "+"/"-" connectors such as B1+/B1-, B2+/B2-.
After the tool recognition circuit 120 recognizes the voltage platform type of the externally connected power tool, the control circuit 130, such as the MCU, controls the actions of the electronic switches in the electronic switch permutation and combination circuit 150, for example, an alternative electronic adaptation scheme is as follows:
the B1+/B1-, B2 +/B2-and the like are arranged and combined through electronic control:
as in the A combination: b1- → B1+ B2- → B2+. namely SW3/SW5/SW2 are turned on, SW1/SW4 are turned off, battery pack series connection is achieved, and high voltage is achieved. For example, 2 battery groups consisting of 5 lithium unit batteries (18650 single batteries) with the lengths of 2000mAh and the voltage of 3.6V are connected in series to realize a 36V 2000mAh battery pack.
Combining as B: (B1-// B2-) → (B1+// B2+), namely SW1/SW2/SW3/SW4 are simultaneously on, and SW5 is off. The parallel connection of the battery combination is realized, and the low-voltage large current is realized. For example, 2 battery combinations consisting of 5 lithium unit batteries of 2000mAh and 3.6V are connected in parallel to realize a battery pack of 18V 4000 mAh.
Thus, the electronic switches in the electronic switch permutation and combination circuit 150 are independently controlled by the control circuit MCU to realize different series and parallel combinations of battery combinations, and certain mathematical logic relations exist between these combinations.
Such as: the voltage presents a multiple relation of U, 2U and 3U.
Such as: capacity exhibits a multiple relationship, i.e., C, 2C, 3C.
Thus, the power supply system capable of automatically adjusting the voltage according to the platform type of the electric tool is realized.
It is noted that the electronic switches (SW1/SW2/SW3/SW4/SW5) mentioned above and in the drawings are not limited to a single switch but may be a combination of a plurality of switches.
In specific embodiments, in order to implement different control strategies for the battery combinations, there are 5 electronic switches between each two different battery combinations 102, wherein the first and second electronic switches (SW1, SW2) are serially disposed between the positive voltage terminals, the third and fourth electronic switches (SW3, SW4) are serially disposed between the negative voltage terminals, and the fifth electronic switch (SW5) is disposed between the first and third electronic switches.
In particular examples, as shown in fig. 2, the electronic switch permutation combination circuit 150 has an initial default permutation combination state, so that the battery pack has a default lower or lowest voltage output characteristic parameter. That is, after the external power tool is connected to the power supply system, the battery pack is set to a voltage pack in an initial default state of the power supply system, e.g., in a scheme having 2 battery packs, such 2 battery packs are defaulted to be connected in parallel to provide a lower or lowest voltage output. Referring to fig. 1 and 2, the internal circuit of the power supply system works and is identified through the tool electrical characteristic mark when the tool is accessed: if the mark identifies a low voltage characteristic, the power supply system does not switch the voltage and keeps the low voltage output characteristic; if the mark is identified as a high voltage characteristic, the power supply system switches the voltage to enable the power supply system to output a high voltage to meet the tool operation requirement.
In other embodiments, the power supply system according to the foregoing embodiments obtains the voltage characteristic of the tool and the operation characteristic of the tool through the identification of the unique identification of the external power tool, so that the power supply system customizes the operation parameters of the tool according to the set program module, and the parameters customizations include the operating over-discharge voltage range U, the protection current I, the protection delay time Td, the protection recovery time tf, and the like, so that the tool is always in a good operation state. As such, the control circuit 130 may be further configured to set an operational parameter customization of the connected tool for the battery pack based on the recognition result, the operational parameter customization including at least one of an operational over-discharge voltage range U, a protection current I, a protection delay time Td, and a protection recovery time tf.
In particular, the customized settings of the operating parameters satisfy:
the operation of the battery pack is determined by the platform of the connected tool;
the battery pack operation protection current I is the maximum output current of the battery pack, and the matched protection current is I when the tool is accessed;
the battery pack operation protection delay time Td is basic time, and the protection delay time matched when a tool is accessed is Td;
the battery pack operation protection recovery time Tf is basic time, and the protection recovery time matched with the tool access time Tf;
wherein: i is kI, k is a constant and k is less than or equal to 1;
td is a Td, a is a constant, and the value of a is determined according to the running characteristics of the tool;
and Tf is b, Tf, b is a constant, and the value of b is determined according to the running characteristic of the tool.
For example, a 20V/40V auto-tune switched power supply system:
the operation of the battery pack is determined by the platform of an external tool, and u1 is 20, 20V, u2 is 40V;
the battery pack operation protection current I is the maximum output current of the battery pack, and the matched protection current is I when the tool is accessed;
the battery pack operation protection delay time Td is basic time, and the protection delay time matched when a tool is accessed is Td;
the battery pack operation protection recovery time Tf is basic time, and the protection recovery time matched with the tool access time Tf;
wherein: i ═ kI, k is a constant and k ═ 1;
td, a is a constant, and the value of a is determined according to the running characteristics of the actual tool
Tf is b Tf, b is a constant, and the value of b is determined according to the running characteristic of the actual tool;
the k/a/b is set according to the actual measurement time of the whole machine.
Such as: when the 20V 4000mAh battery pack is connected into a 40V platform tool, the output of the battery pack is switched to 40V2000mAh
Setting operation protection current I in a 20V 4000mAh battery pack, wherein the current I1 is 0.6I when a 20V electric drill is connected, the current I2 is 0.3I when a 20V fan is connected, and the current I3 is 0.4I when a 40V grass cutter is connected;
setting an operation protection delay time Td in a 20V 4000mAh battery pack, wherein a current Td1 is 1.2 Td when a 20V electric drill is connected, a current Td2 is 1.5 Td when a 20V fan is connected, and a current Td3 is 0.8 Td when a 40V grass cutter is connected;
the operation protection recovery time Tf is set in the 20V 4000mAh battery pack, the current Tf1 is 1.5 Tf when a 20V electric drill is connected, the current Tf2 is 0.5 Tf when a 20V fan is connected, and the current Tf3 is 0.9 Tf when a 40V grass cutter is connected.
Therefore, through the power supply system with the self-regulated voltage of the various technical schemes, the output voltage/current of the battery pack is automatically regulated according to the type of the voltage platform of the whole machine of the accessed electric tool, so that a single battery pack has the capacity of multiple output voltages, can be applied to tools with multiple platform voltages, improves the universality of the tools, and solves the problem of switching among multiple battery pack platforms of an end user. Meanwhile, on the basis of self-adjusting the voltage according to the type of the tool platform, the operation parameter characteristics of the battery pack/battery pack are creatively adjusted according to the voltage platform, so that the battery pack is better adapted to the operation of the tool, and the tool is always in a good operation state.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (7)
1. A self-regulating voltage supply system comprising a battery pack having a plurality of unit cells, a tool identification circuit, an electronic switch arrangement circuit, a control circuit, and a tool interface, wherein: the battery pack is provided with a plurality of groups of battery combinations formed by the unit batteries, each battery combination is formed by connecting the same number of unit batteries in series and defines a positive voltage end and a negative voltage end of the battery combination, and the positive voltage end and the negative voltage end are both connected to the electronic switch arrangement combination circuit; the tool identification circuit is connected with the control circuit and used for identifying the voltage platform type of the tool when the power supply system is connected to the electric tool; the control circuit controls an electronic switch arrangement combination circuit arranged between the battery packs according to the identification result of the tool identification circuit to adjust the power output of the battery pack and output the power through a tool interface, wherein the electronic switch arrangement combination circuit is provided with a plurality of electronic switches; the tool interface also comprises at least one identification terminal which is connected with the tool identification circuit;
wherein the control circuit is further configured to set an operational parameter customization of the connected tool for the battery pack according to the recognition result, the operational parameter customization including at least one of an operational over-discharge voltage range U, a protection current I, a protection delay time Td and a protection recovery time tf;
wherein the customized settings for the operating parameters satisfy: the operation of the battery pack is determined by the platform of the connected tool; the battery pack operation protection current I is the maximum output current of the battery pack, and the matched protection current is I when the tool is accessed; the battery pack operation protection delay time Td is basic time, and the protection delay time matched when a tool is accessed is Td; the battery pack operation protection recovery time Tf is basic time, and the protection recovery time matched with the tool access time Tf;
wherein: i is kI, k is a constant and k is less than or equal to 1;
td is a Td, a is a constant, and the value of a is determined according to the running characteristics of the tool;
and Tf is b, Tf, b is a constant, and the value of b is determined according to the running characteristic of the tool.
2. The self-regulated voltage supply system according to claim 1, wherein the electronic switches of said electronic switch bank combining circuit are disposed between the positive voltage terminal and the negative voltage terminal of different battery combinations, and the voltage and/or current output of the battery pack is regulated by adjusting the on and off of the electronic switches.
3. The self-regulated voltage supply system according to claim 1, wherein the control circuit controls the electronic switch arrangement and combination circuit to control the serial and/or parallel connection of different battery combinations according to the recognition result, and adjusts the voltage or current outputted by the battery pack to be changed by multiples.
4. The self-regulating voltage supply system of claim 1 wherein said electronic switch permutation combination circuit has an initial default permutation combination state such that the battery pack has a default lower or lowest voltage output characteristic parameter.
5. A self-regulating voltage supply system according to any one of claims 1 to 4, wherein there are 5 electronic switches between each two different said battery combinations, wherein the first and second electronic switches are arranged in series between the positive voltage terminals, the third and fourth electronic switches are arranged in series between the negative voltage terminals, and the fifth electronic switch is arranged between the first and third electronic switches.
6. The self-regulated voltage supply system according to claim 1, wherein each electronic switch of said electronic switch permutation and combination circuit is independently controlled by said control circuit.
7. The self-regulated voltage supply system according to claim 1, wherein said tool identification circuit comprises one of an ID resistor, a magnetic sensor, and a voltage detection circuit.
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| CN201710475247.2A CN107276156B (en) | 2017-06-22 | 2017-06-22 | Power supply system capable of self-adjusting voltage |
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| US11677260B2 (en) | 2018-10-22 | 2023-06-13 | O2Micro Inc. | Managing power in a portable device comprising multiple batteries |
| GB2578828B (en) | 2018-10-22 | 2021-03-10 | O2Micro Inc | Managing power in a portable device comprising multiple batteries |
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| CN201364940Y (en) * | 2008-12-08 | 2009-12-16 | 蔡道华 | Novel multifunctional lithium ion battery pack and protective circuit thereof |
| JP2014183714A (en) * | 2013-03-21 | 2014-09-29 | Kddi Corp | Discharge controller, discharge control method, and program |
| CN105210258A (en) * | 2013-03-15 | 2015-12-30 | 设计通量技术公司 | Method and apparatus for creating a dynamically reconfigurable energy storage device |
| CN105978055A (en) * | 2015-03-13 | 2016-09-28 | 苏州宝时得电动工具有限公司 | Power supply device and power transmission device |
| JP2016226279A (en) * | 2015-05-29 | 2016-12-28 | 国立大学法人 東京大学 | Power converter, power network system and control method therefor |
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2017
- 2017-06-22 CN CN201710475247.2A patent/CN107276156B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| CN201364940Y (en) * | 2008-12-08 | 2009-12-16 | 蔡道华 | Novel multifunctional lithium ion battery pack and protective circuit thereof |
| CN105210258A (en) * | 2013-03-15 | 2015-12-30 | 设计通量技术公司 | Method and apparatus for creating a dynamically reconfigurable energy storage device |
| JP2014183714A (en) * | 2013-03-21 | 2014-09-29 | Kddi Corp | Discharge controller, discharge control method, and program |
| CN105978055A (en) * | 2015-03-13 | 2016-09-28 | 苏州宝时得电动工具有限公司 | Power supply device and power transmission device |
| JP2016226279A (en) * | 2015-05-29 | 2016-12-28 | 国立大学法人 東京大学 | Power converter, power network system and control method therefor |
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