Adapter

Abstract

The invention discloses an adapter. The adapter comprises a shell; the control circuit is located in an accommodating cavity formed by the shell; the plurality of battery pack interfaces are arranged to be connected with battery packs capable of supplying power to the electric tool; the USB interface is arranged to be at least connected with electric equipment and / or a charger; the control circuit at least comprises a power circuit which is configured to control the USB interface to transmit electric energy; and the controller is set to detect the electric signal of each battery pack interface so as to determine the parameters of the battery pack accessed to the adapter and control the power circuit to control the electric energy transmission power of the USB interface according to the parameters of the battery pack.

Description

Technical Field

[0001] The invention relates to the technical field of power supply of electric tools, and in particular to an adapter. Background Art

[0002] The adapter is usually used to connect the battery pack and the power-consuming device to realize the function of the battery pack supplying power to the power-consuming device.

[0003] The adapter used for power tools has a single power transmission power and a single function. For example, it is only applicable to a fixed type of battery pack and can only discharge the battery pack at a fixed power transmission power. Summary of the invention

[0004] The invention provides an adapter to solve the problem that the existing adapter has a single power transmission power and a single function.

[0005] According to one aspect of the present invention, there is provided an adapter, comprising:

[0006] case;

[0007] A control circuit is located in the accommodating cavity formed by the shell;

[0008] A plurality of battery pack interfaces configured to receive a battery pack capable of powering the power tool;

[0009] A USB interface, configured to connect to at least a power-consuming device and / or a charger;

[0010] Wherein, the control circuit at least includes:

[0011] A power circuit configured to control the USB interface to transmit power;

[0012] The controller is configured to detect the electrical signals of each battery pack interface to determine the parameters of the battery pack connected to the adapter, and control the power circuit to control the power transmission power of the USB interface according to the parameters of the battery pack.

[0013] Optionally, the electrical signal of each battery pack interface includes at least: a voltage signal and / or a resistance signal.

[0014] Optionally, the USB interface includes: a bidirectional transmission interface; the power circuit includes a first power circuit;

[0015] When the bidirectional transmission interface is electrically connected to a first power-consuming device, the first power circuit is used to control the discharge power of the battery pack to the first power-consuming device according to the parameters of the battery pack;

[0016] When the bidirectional transmission interface is electrically connected to the charger, the first power circuit is used to control the charging power of the charger to the battery pack according to the parameters of the battery pack.

[0017] Optionally, the USB interface includes: a unidirectional transmission interface for electrically connecting to a second electrical device;

[0018] The power circuit includes a second power circuit, which is used to control the discharge power of the battery pack to the second power-consuming device according to the parameters of the battery pack when the unidirectional transmission interface is electrically connected to the second power-consuming device.

[0019] Optionally, the controller is configured to: obtain electrical signals from each of the battery pack interfaces, and determine parameters of the battery pack in combination with the electrical signals from each of the battery pack interfaces.

[0020] Optionally, the plurality of battery pack interfaces include a first type of interface and a second type of interface;

[0021] The first type of interface is set in one-to-one correspondence with the universal port of each battery pack, and the second type of interface is set in one-to-one correspondence with the specific port of at least one type of battery pack;

[0022] The controller is configured to determine that the parameter of the battery pack is a first-category parameter when detecting at least one electrical signal of the first-category interface and at least one electrical signal of the second-category interface;

[0023] The controller is configured to determine that the parameters of the battery pack are second-type parameters when an electrical signal of at least one of the first-type interfaces is detected and no electrical signal of the second-type interface is detected.

[0024] Optionally, the first power circuit includes:

[0025] An electric energy control unit, used to obtain parameters of the battery pack and control the electric energy conversion circuit to perform electric energy conversion according to the parameters of the battery pack;

[0026] An electric energy conversion circuit is used to convert the power signal provided by the battery pack into electric energy and output it to the first electric device under the control of the electric energy control unit when the bidirectional transmission interface is electrically connected to the first electric device; and is used to convert the electrical signal provided by the charger into electric energy and output it to the battery pack under the control of the electric energy control unit when the bidirectional transmission interface is electrically connected to the charger.

[0027] Optionally, the control circuit further includes:

[0028] The charge / discharge switch circuit is configured to control the on / off state of the first power circuit.

[0029] Optionally, the first type of interface includes at least a positive electrode interface, a negative electrode interface and a collection / communication interface; and the control circuit further includes:

[0030] A first capacitor, electrically connected between the positive electrode interface and the ground terminal;

[0031] A discharge circuit, comprising a discharge input terminal, a discharge output terminal and a discharge control terminal; the discharge input terminal is electrically connected to the positive electrode interface, the discharge output terminal is electrically connected to the ground terminal, and the discharge control terminal is electrically connected to the controller;

[0032] The controller is also used to determine a preset connection state of the battery pack according to the electrical signal of the acquisition / communication interface C1 / D, and when it is determined according to the preset connection state that the battery pack and the battery pack interface are all disconnected, control the discharge circuit to discharge the electrical energy stored in the first capacitor.

[0033] Optionally, the controller is further used to determine the actual connection state of the battery pack according to the electrical signal of the positive electrode interface after controlling the discharge circuit to discharge the electrical energy stored in the first capacitor.

[0034] Optionally, the discharge circuit includes a discharge resistor and a first control switch;

[0035] The first end of the first control switch is electrically connected to the positive electrode interface through the discharge resistor, the second end of the first control switch is electrically connected to the ground end, and the control end of the first control switch is electrically connected to the controller;

[0036] The first control switch is used to be turned on or off under the control of the controller.

[0037] Optionally, the controller further includes:

[0038] The protection module is used to control the charge / discharge switch circuit to be disconnected when the charging voltage output by the charger to the battery pack is greater than the charging protection voltage of the battery pack.

[0039] Optionally, the control circuit further includes:

[0040] A secondary protection unit is used to determine the charging voltage of the battery pack according to at least one electrical signal of the battery pack interface, and control the charge / discharge switch circuit to be disconnected when the charging voltage is greater than the secondary charging protection voltage of the battery pack.

[0041] Optionally, the adapter also includes: the control circuit is arranged on a circuit board; a switch key is arranged on the circuit board and is configured to at least control the charging / discharging of the adapter; an indicator light is arranged on the circuit board and is adjacent to at least one side of the switch key.

[0042] The adapter provided in the embodiment of the present invention includes multiple battery pack interfaces, which can be electrically connected to each terminal of different types of battery packs. The housing of the adapter includes a control circuit, which may include a controller and a power circuit. The controller can detect the electrical signals of each battery pack interface, and can determine the parameters of the connected battery pack according to the electrical signals of each battery pack interface, and then can control the power circuit to control the power transmission power of the USB interface according to the parameters of the battery pack, and can adjust the size of the power transmission power according to different types of battery packs. The adapter also includes a USB interface, which is at least used to connect to an electrical device and / or a charger to realize the discharge function and / or charging function of the battery pack, thereby overcoming the defects of the adapter in the prior art of single power transmission power and single working mode.

[0043] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 is a schematic structural diagram of an adapter provided by an embodiment of the present invention;

[0046] Figure 2 is a schematic structural diagram of another adapter provided by an embodiment of the present invention;

[0047] Figure 3 is a structural schematic diagram of another adapter provided by an embodiment of the present invention;

[0048] Figure 4 is a structural schematic diagram of another adapter provided by an embodiment of the present invention;

[0049] Figure 5 is a structural schematic diagram of another adapter provided by an embodiment of the present invention;

[0050] Figure 6is a structural schematic diagram of another adapter provided by an embodiment of the present invention;

[0051] Figure 7 is a structural schematic diagram of another adapter provided by an embodiment of the present invention;

[0052] Figure 8 This is another schematic diagram of the positions of some components on a circuit board in an adapter provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] Figure 1 is a schematic diagram of the structure of an adapter provided by an embodiment of the present invention, such as Figure 1 As shown, the adapter 100 includes: a housing 10; a control circuit 20, located in the accommodating cavity formed by the housing 10; a plurality of battery pack interfaces 30, configured to connect to a battery pack capable of powering an electric tool; a USB interface 40, configured to connect to at least an electrical device and / or a charger; wherein the control circuit 20 at least includes: a power circuit 21, configured to control the USB interface 40 to transmit electrical energy; a controller 22, configured to detect electrical signals of each battery pack interface 30 to determine the parameters of the battery pack connected to the adapter 100, and control the power circuit 21 to control the power transmission power of the USB interface 40 according to the parameters of the battery pack. The parameters of the battery pack may include the model of the battery pack, the voltage platform, temperature, real-time voltage, current, internal resistance, etc. of the battery pack. The transmission power of the USB interface can be understood as the maximum allowable transmission power of the USB interface.

[0056] The adapter 100 may include a battery pack interface 30 for connecting a battery pack, and a USB interface 40 for connecting an electrical device or a charger. Different types of battery packs may include different ports in addition to the common ports due to different safety requirements. In order to adapt to the use of battery packs with different parameter specifications, the adapter 100 may include a plurality of battery pack interfaces 30 corresponding to the ports of battery packs with various parameters. When connecting different types of battery packs, each battery pack interface 30 may be electrically connected to each port on the battery pack in a one-to-one correspondence.

[0057] In one embodiment, the adapter 100 may include a USB interface 40. In the embodiment of the present invention, the adapter 100 preferably includes two USB interfaces 40, one of which is configured to access an electrical device, and the other is configured to access a charger, so that the adapter 100 can connect a battery pack to an electrical device, or can connect a battery pack to a charger. Alternatively, one of the USB interfaces 40 can be configured to access both an electrical device and a charger, and the other USB interface 40 can be configured to only access a charger or only access an electrical device, so that the adapter 100 can connect a battery pack to an electrical device, and / or can connect a battery pack to a charger.

[0058] The housing 10 of the adapter 100 may include a control circuit 20, and the control circuit 20 may include a power circuit 21. In this embodiment, the power circuit 21 may be arranged in a one-to-one correspondence with the USB interface 40 to independently control the corresponding USB interface 40 to transmit power.

[0059] The control circuit 20 may further include a controller 22, which can detect the electrical signals of each battery pack interface 30, and can determine the parameters of the battery pack connected to the adapter 100 according to the electrical signals of each battery pack interface 30, and after determining the parameters of the battery pack, send information indicating the parameters of the battery pack to the power circuit 21, so that the power circuit 21 can control the power transmission power of the USB interface 40 according to the parameters of the battery pack. Exemplarily, "0" can be used to indicate that the parameters of the battery pack are rated voltage less than or equal to 12V, and "1" can be used to indicate that the type of the battery pack is rated voltage less than or equal to 20V.

[0060] The adapter provided in the embodiment of the present invention includes multiple battery pack interfaces, which can be electrically connected to each terminal of different types of battery packs. The housing of the adapter includes a control circuit, which may include a controller and a power circuit. The controller can detect the electrical signals of each battery pack interface, and can determine the parameters of the connected battery pack according to the electrical signals of each battery pack interface, and then can control the power circuit to control the power transmission power of the USB interface according to the parameters of the battery pack, and can adjust the size of the power transmission power according to different types of battery packs. The adapter also includes a USB interface, which is at least used to connect to an electrical device and / or a charger to realize the discharge function and / or charging function of the battery pack, thereby overcoming the defects of the adapter in the prior art of single power transmission power and single working mode.

[0061] In this embodiment, the USB interface 40 may include a bidirectional transmission interface 41. The power circuit 21 includes a first power circuit 211; when the bidirectional transmission interface 41 is electrically connected to a first power-consuming device, the first power circuit 211 is used to control the discharge power of the battery pack to the first power-consuming device according to the parameters of the battery pack; when the bidirectional transmission interface 41 is electrically connected to a charger, the first power circuit 211 is used to control the charging power of the charger to the battery pack according to the parameters of the battery pack.

[0062] The first power circuit 211 can be electrically connected between the battery pack and the bidirectional transmission interface 41, wherein the multiple battery pack interfaces 30 include a positive electrode interface B+, and the positive electrode interface B+ is electrically connected to the positive terminal of the battery pack, then the first power circuit 211 can be electrically connected to the positive terminal of the battery pack through the positive electrode interface B+. The bidirectional transmission interface 41 can be electrically connected to an electrical device, and can also be electrically connected to a charger. When the bidirectional transmission interface 41 is electrically connected to the first electrical device, the battery pack discharges to the first electrical device through the first power circuit 41, that is, the battery pack supplies power to the first electrical device, and the bidirectional transmission interface 41 is a power output interface. When the bidirectional transmission interface 41 is electrically connected to the charger, the charger transmits electrical energy to the battery pack through the first power circuit 41, and the bidirectional transmission interface 41 is a power input interface. On this basis, the first power circuit 211 is also electrically connected to the controller 22 to obtain the parameter information of the battery pack provided by the controller 22, so that the first power circuit 211 can further control the power of the electric energy transmission between the battery pack and the bidirectional transmission interface 41 according to the parameters of the connected battery pack, so as to ensure that the battery pack is charged or discharged with appropriate power, avoid the battery pack from being damaged due to excessive charging power or excessive discharging power, and help to improve the service life of the battery pack. Exemplarily, the bidirectional transmission interface 41 is preferably a USB-C interface.

[0063] Continue to refer Figure 1The USB interface 40 may further include: a unidirectional transmission interface 42 for electrically connecting to a second power-consuming device. The power circuit 21 includes a second power circuit 212 for controlling the discharge power of the battery pack to the second power-consuming device according to the parameters of the battery pack when the unidirectional transmission interface 42 is electrically connected to the second power-consuming device.

[0064] In this embodiment, the unidirectional transmission interface 42 can connect to an electrical device. Exemplarily, the second power circuit 212 is electrically connected between the unidirectional transmission interface 42 and the battery pack. When the unidirectional transmission interface 42 is electrically connected to the second electrical device, the battery pack discharges to the second electrical device through the second power circuit 212, that is, the battery pack supplies power to the second electrical device. On this basis, the second power circuit 212 is also electrically connected to the controller 22 to obtain parameter information of the battery pack provided by the controller 22. In this way, the second power circuit 212 can further control the size of the power transmission between the battery pack and the unidirectional transmission interface 42 according to the parameters of the connected battery pack, so as to ensure that the battery pack is discharged at an appropriate power, avoid damage to the battery pack due to excessive discharge power, and help to increase the service life of the battery pack. Exemplarily, the unidirectional transmission interface 42 is preferably a USB-A interface.

[0065] It should be noted that, in order to distinguish the bidirectional transmission interface 41 from the unidirectional transmission interface 42, the embodiment of the present invention divides the electrical equipment into "first" and "second", that is, the first electrical equipment may be the same as the second electrical equipment or different, or, in a feasible embodiment, the same electrical equipment may be connected to both the unidirectional transmission interface 42 and the bidirectional transmission interface 41, and the embodiment of the present invention does not make any specific limitation on this.

[0066] In a feasible embodiment, when the bidirectional transmission interface 41 is connected to the first power user, the unidirectional transmission interface 42 can also be connected to the second power user. At this time, the controller 22 can control the battery pack to discharge to the first power user and the second power user at the same time, or can discharge one of them selectively. Alternatively, when the bidirectional transmission interface 41 is connected to the charger, the unidirectional transmission interface 42 can also be connected to the second power user. At this time, the controller 22 can control the battery pack to perform the charging process and the discharging process at the same time, or can control the battery pack to perform only the charging process or only the discharging process according to the rated voltage of the battery pack and the current voltage signal. Exemplarily, if it is determined that the battery pack has sufficient power according to the rated voltage of the battery pack and the current voltage signal, for example, more than 60%, the battery pack can be controlled to perform only the discharging process. If it is determined that the battery pack has low power according to the rated voltage of the battery pack and the current voltage signal, for example, less than 20%, the battery pack can be controlled to perform only the charging process. If it is determined that the battery pack has moderate power according to the rated voltage of the battery pack and the current voltage signal, for example, between 20% and 60%, the battery pack can be controlled to perform the charging process and the discharging process at the same time.

[0067] Continue to refer Figure 1 The controller 22 is configured to obtain the electrical signal of the battery pack interface 30 and determine the battery pack parameters in combination with the electrical signals of each battery pack interface. In one embodiment, the controller 22 can determine the battery pack parameters in combination with whether different battery pack interfaces 30 have electrical signals.

[0068] Exemplarily, the electrical signal of each battery pack interface 30 includes at least: a voltage signal and / or a resistance signal.

[0069] In one embodiment, the plurality of battery pack interfaces 30 include a first type interface 31 and a second type interface 32 ; the first type interface 31 is a universal interface for each battery pack, and the second type interface 32 is a specific interface for at least one type of battery pack.

[0070] The universal interface is the interface included in different types of battery packs, such as the positive terminal, negative terminal and communication terminal. The specific interface is the port of a certain type of battery pack that is different from other types of battery packs. For example, a battery pack with a rated voltage less than or equal to 12V, compared with a battery pack with a rated voltage less than or equal to 20V, includes the first voltage acquisition terminal, the second voltage acquisition terminal and the resistance acquisition terminal in addition to the above universal interface. Therefore, the first type of interface 31 can correspond to the positive electrode interface B+, the negative electrode interface B- and the communication interface D, and the second type of interface 32 can correspond to the first voltage acquisition interface C1, the second voltage acquisition interface C2 and the resistance acquisition interface NTC.

[0071] When a battery pack with a rated voltage less than or equal to 12V is connected to the adapter 100, the first type of interface 31 can be electrically connected to each universal interface of the battery pack in a one-to-one correspondence, and the second type of interface 32 can be electrically connected to each specific interface of the battery pack in a one-to-one correspondence. That is, the positive electrode interface B+ is electrically connected to the positive end of the battery pack, the negative electrode interface B- is electrically connected to the negative end of the battery pack, the communication interface D is electrically connected to the communication end of the battery pack, the first voltage acquisition interface C1 is electrically connected to the first voltage acquisition end of the battery pack, the second voltage acquisition interface C2 is electrically connected to the second voltage acquisition end of the battery pack, and the resistance acquisition interface NTC is electrically connected to the resistance acquisition end of the battery pack. Among them, the first voltage acquisition interface C1 and the second voltage acquisition interface C2 can collect the voltage between the positive and negative ends of different battery cells.

[0072] When a battery pack with a rated voltage of less than or equal to 12V is connected to the adapter 100, the first-class interface 31 is electrically connected to each universal port of the battery pack in a one-to-one correspondence, and the second-class interface 32 is electrically connected to a specific interface of the battery pack. The first-class interface 31 is a universal interface and has an electrical signal, and each second-class interface 32 also has an electrical signal. Therefore, the controller 22 can detect the electrical signal of at least one first-class interface 31 and the electrical signal of at least one second-class interface 32, so as to determine that the parameters of the battery pack are first-class parameters, for example, the rated voltage of the battery pack in the first-class parameters is less than or equal to 12V.

[0073] When a battery pack with a rated voltage less than or equal to 20V is connected to the adapter 100, the first-class interface 31 is electrically connected to each universal port of the battery pack one by one, while the second-class interface 32 is left floating. As a universal interface, the first-class interface 31 has an electrical signal. Each second-class interface 32 does not have an electrical signal because it is left floating. Therefore, when the controller 22 detects an electrical signal from at least one first-class interface 31 and cannot detect an electrical signal from the second-class interface 32, it can determine that the parameters of the battery pack are second-class parameters, for example, the rated voltage of the battery pack in the second-class parameters is less than or equal to 20V.

[0074] In a feasible embodiment, since some battery packs with a rated voltage less than or equal to 12V do not include a communication terminal D, the communication interface D can be set to be shared with the first voltage acquisition interface C1, that is, the battery pack interface 30 includes a positive electrode interface B+, a negative electrode interface B-, an acquisition / communication interface C1 / D, a second voltage acquisition interface C2, and a resistance acquisition interface NTC. At this time, if the connected battery pack is a type with a rated voltage less than or equal to 20V, the acquisition / communication interface C1 / D is used as the communication interface D, and if the connected battery pack is a type with a rated voltage less than or equal to 12V, the acquisition / communication interface C1 / D is used as the first voltage acquisition interface C1.

[0075] refer to Figure 2 is a schematic diagram of the structure of another adapter provided by an embodiment of the present invention, such as Figure 2 As shown, the first power circuit 211 includes: an electric energy control unit 2111, which is used to obtain the parameters of the battery pack provided by the controller 22, and control the electric energy conversion circuit 2112 to perform electric energy conversion according to the parameters of the battery pack; the electric energy conversion circuit 2112 is used to convert the power signal provided by the battery pack into electric energy and output it to the first electric device under the control of the electric energy control unit 2111 when the bidirectional transmission interface 41 is electrically connected to the first electric device; and, when the bidirectional transmission interface 41 is electrically connected to the charger, under the control of the electric energy control unit 2111, convert the electrical signal provided by the charger into electric energy and output it to the battery pack.

[0076] The power conversion circuit 2112 may include a DC / DC circuit, and the power control unit 2111 may include output terminals corresponding to each transistor in the DC / DC circuit, each output terminal is electrically connected to the gate of each transistor in a one-to-one correspondence, and the DC / DC circuit is electrically connected between the bidirectional transmission interface 41 and the positive electrode interface B+. After determining the battery pack parameters, the controller 22 may send the parameters representing the battery pack to the power control unit 2111 and the second power circuit 212. Among them, if the bidirectional transmission interface 41 is connected to the first power-consuming device, the power control unit 2111 controls the frequency and / or duty cycle of each transistor in the power conversion circuit 2112 according to the parameters of the battery pack, converts the power signal provided by the battery pack into power, realizes the adjustment of the power output of the battery pack, and outputs the adjusted output power to the first power-consuming device. If the bidirectional transmission interface 41 is connected to a charger, the power control unit 2111 also controls the power conversion circuit 2112 to convert the electrical signal provided by the charger into power according to the parameters of the battery pack, so that the output power after the power conversion meets the charging power of the battery pack, and the battery pack is charged with this power. In this way, the safety of the charging and discharging process of the battery pack can be improved, and the service life of the battery pack can be improved. Exemplarily, if the rated voltage of the connected battery pack is less than or equal to 12V, the power control unit 2111 controls the output power of the power conversion circuit 2112 to be within the range of 60W to 65W. If the rated voltage of the connected battery pack is less than or equal to 20V, the power control unit 2111 controls the output power of the power conversion circuit 2112 to be 100W.

[0077] Figure 3 is a schematic diagram of the structure of another adapter provided by an embodiment of the present invention, such as Figure 3 As shown, the control circuit further includes a charge / discharge switch circuit 23 configured to control the on / off state of the first power circuit 211 .

[0078] The charge / discharge switch circuit 23 can be electrically connected between the first power circuit 211 and the bidirectional transmission interface 41. It can be electrically connected to the controller 22, turned on or off under the control of the controller 22, and / or can be electrically connected to the power control unit 2111. The power control unit 2111 controls the charge / discharge switch circuit 23 to be turned on or off according to the control signal of the controller 22. In other feasible embodiments of the present invention, a control component can also be provided, and the user controls the charge / discharge switch circuit 23 to be turned on or off through the control component. When the charge / discharge switch circuit 23 is turned on, the current path between the bidirectional transmission interface 41 and the first power circuit 211 is turned on, and power transmission can be achieved. When the charge / discharge switch circuit 23 is disconnected, the current path between the bidirectional transmission interface 41 and the first power circuit 211 is open, and power transmission cannot be performed. Exemplarily, the charge / discharge switch circuit 23 can be a back-to-back MOS switch tube.

[0079] Figure 4 is a schematic diagram of the structure of another adapter provided by an embodiment of the present invention, such as Figure 4 As shown, the controller 22 further includes: a protection module 221, which is used to control the charge / discharge switch circuit 23 to be disconnected when the charging voltage output by the charger to the battery pack is greater than the charging protection voltage of the battery pack.

[0080] The controller 22 may be provided with a protection module 221 for protecting the battery pack. The protection module 221 may be electrically connected to the connection node between the power conversion circuit 2112 and the positive electrode interface B+. When the bidirectional transmission interface 41 is electrically connected to the charger, if the charging voltage output by the charger to the battery pack through the first power circuit 211 is greater than the charging protection voltage of the battery pack, the charge / discharge switch circuit 23 is controlled to be disconnected to avoid damage to the battery pack caused by excessive power input and affect the service life of the battery pack. The protection module 221 may determine the rated voltage of the battery pack according to the type of the battery pack. Among them, the charging protection voltage may be understood as the voltage set by the adapter side for safe charging of the battery pack.

[0081] In other feasible embodiments of the present invention, the protection module 221 can also be electrically connected to the connection node between the power conversion circuit 2112 and the bidirectional transmission interface 41, and can be electrically connected to the connection node between the second power circuit 212 and the unidirectional transmission interface 42. In this way, no matter whether the battery pack is in the charging process or the discharging process, the protection module 221 can control the charge / discharge switch circuit 23 to disconnect when the voltage of each node is greater than the rated voltage, so as to further improve the service life of the battery pack.

[0082] Continue to refer Figure 4 The control circuit 20 may further include a secondary protection unit 24 for determining the charging voltage of the battery pack according to an electrical signal of at least one battery pack interface 30, and controlling the charge / discharge switch circuit 23 to disconnect when the charging voltage is greater than the secondary charging protection voltage of the battery pack.

[0083] The secondary protection unit 24 can be electrically connected to at least one battery pack interface 30, preferably to at least one first-class interface 31. When the bidirectional transmission interface 41 is connected to the charger, the secondary protection unit 24 is used to obtain the electrical signal of the connected battery pack interface 30, so as to be able to determine the charging voltage of the battery pack according to the electrical signal of at least one battery pack interface 30. When it is determined that the charging voltage is greater than the secondary charging protection voltage of the battery pack, the charge / discharge switch circuit 23 is controlled to be disconnected. In this way, when the protection module 221 in the controller 22 fails, the battery pack can be protected by the secondary protection unit 24. Exemplarily, the secondary protection unit 24 can be electrically connected to the acquisition / communication interface C1 / D, and can determine the charging voltage of the battery pack according to the electrical signal of the acquisition / communication interface C1 / D. The enable end of the secondary protection unit 24 can be electrically connected to a fixed voltage signal and is always in an enabled state, or, in a feasible embodiment, the enable end of the secondary protection unit 24 can also be electrically connected to the controller 22. When the controller 22 determines that the protection module fails, the secondary protection unit 24 can be controlled to be enabled, so that the secondary protection unit 24 works. In this embodiment, the secondary charging protection voltage can be connected to the safe voltage for charging the battery pack set on the battery pack side. The secondary charging protection voltage can be consistent with or different from the charging protection voltage set on the adapter side. It can be understood that the charging protection voltage or secondary charging protection voltage of battery packs with different voltage platforms is different.

[0084] Figure 5 FIG. 1 is a schematic diagram of the structure of another adapter provided by an embodiment of the present invention. Figure 5 As shown, the first type of interface at least includes a positive electrode interface B+, a negative electrode interface B- and a collection / communication interface C1 / D; the control circuit 20 also includes: a first capacitor C0, electrically connected between the positive electrode interface B+ and the ground terminal GND; a discharge circuit 25, including a discharge input terminal, a discharge output terminal and a discharge control terminal; the discharge input terminal is electrically connected to the positive electrode interface B+, the discharge output terminal is electrically connected to the ground terminal GND, and the discharge control terminal is electrically connected to the controller 22; the controller 22 is also used to determine the preset connection state of the battery pack according to the electrical signal of the collection / communication interface C1 / D, and when it is determined that the battery pack and the battery pack interface are all disconnected according to the preset connection state, the discharge circuit 25 is controlled to discharge the electrical energy stored in the first capacitor C0.

[0085] Specifically, the positive electrode interface B+ is electrically connected to the positive terminal B+ of the battery pack, and the negative electrode interface B- is electrically connected to the negative electrode of the battery pack. For a battery pack including a communication terminal, the acquisition / communication interface C1 / D is electrically connected to the communication terminal of the battery pack. For a battery pack not including a communication terminal, the acquisition / communication interface C1 / D is electrically connected to one of the voltage acquisition terminals of the battery pack. The control circuit 20 may include a first capacitor C0 for filtering. When the battery pack is discharged, the first capacitor C0 can filter the voltage signal input from the battery pack to the control circuit 20. When the battery pack is charged, the first capacitor C0 can filter the voltage signal transmitted from the control circuit 20 to the battery pack. Since the first capacitor C0 is an energy storage element, the first capacitor C0 will store electrical energy during the charging and discharging process of the battery pack, and after the battery pack is disconnected from the adapter 100, since the first capacitor C0 stores electrical energy, the voltage at the positive terminal B+ will not change immediately after the battery pack is disconnected from the adapter, so that the controller 22 may not be able to detect in time that the battery pack is disconnected from the adapter. If a new battery pack is connected in a short time, the controller cannot quickly identify the replacement of the battery pack, resulting in a lag in the power output control of the adapter, which may damage the battery pack, adapter or power-consuming equipment. In addition, if the replacement of the battery pack cannot be quickly identified, the need for fast plugging and unplugging of the battery pack cannot be met.

[0086] In this embodiment, the discharge circuit 25 can be electrically connected between the positive electrode interface B+ and the ground terminal GND, and can discharge or stop the discharge of electric energy under the control of the controller 22. Due to the setting of the first capacitor C0, after the battery pack is disconnected from all the battery pack interfaces of the adapter 100, the electrical signal of the positive electrode interface B+ may not change. The controller can only determine the disconnection between the battery pack and the acquisition / communication interface C1 / D based on the electrical signal of the acquisition / communication interface C1 / D, and cannot determine the connection status of the battery pack with other interfaces. At this time, the controller 22 can determine that the current preset connection status of the battery pack is completely disconnected or partially disconnected. At this time, the discharge circuit can be controlled to discharge the electric energy stored in the first capacitor C0 to ensure the safe use of the adapter 100.

[0087] Continue to refer Figure 5 The discharge circuit 25 includes a discharge resistor R0 and a first control switch K0; the first end of the first control switch K0 is electrically connected to the positive electrode interface B+ through the discharge resistor R0, the second end of the first control switch K0 is electrically connected to the ground terminal GND, and the control end of the first control switch K0 is electrically connected to the controller 22; the first control switch K0 is used to be turned on or off under the control of the controller 22.

[0088] The discharge resistor R0 and the first control switch K0 are connected in series between the positive electrode interface B+ and the ground terminal GND, and the control end of the first control switch K0 is electrically connected to the controller 22, and can be turned on or off under the control of the controller 22. That is, when the controller 22 determines that the current preset connection state of the battery pack is completely disconnected or partially disconnected, the first control switch K0 is controlled to be in the on state, so that the discharge resistor R0 can discharge the electric energy stored in the first capacitor C0. When the controller 22 determines that the current preset connection state of the battery pack is fully connected, the first control switch K0 is controlled to be in the off state to ensure the filtering effect of the first capacitor C0.

[0089] refer to Figure 5 The controller 22 is also used to determine the actual connection state of the battery pack according to the electrical signal of the positive electrode interface B+ after controlling the discharge circuit 25 to discharge the electrical energy stored in the first capacitor C0.

[0090] After the discharge circuit 25 discharges the electric energy stored in the first capacitor C0, the controller 22 can detect the electric signal of the positive interface B+ at this time. If the electric signal of the positive interface B+ is zero, the first power circuit 211 and / or the second power circuit 212 are controlled to stop transmitting power, and it can be determined that the battery pack is completely disconnected from the adapter 100. If the electric signal of the positive interface B+ is greater than zero, it can be determined that the battery pack is not completely disconnected from the adapter 100. At this time, the first power circuit 211 and / or the second power circuit 212 can be controlled to continue transmitting power.

[0091] refer to Figures 6 to 8 As shown in the structural diagram of the adapter, the adapter 100 also includes a circuit board 50, and in addition to the control circuit 20, the circuit board 50 may also include a switch key 51 and an indicator light 52. Among them, the switch key 51 is configured to at least control the charge / discharge of the adapter 100. The indicator light 52 can at least indicate the current working state of the adapter 100, wherein the working state may include a charge / discharge state, a fault state or other states. In one embodiment, the indicator light 52 can indicate different working states of the adapter 100 by flashing frequency, color, quantity and combinations of different forms. In this embodiment, the indicator light 52 is arranged adjacent to the switch key 51, at least adjacent to one side of the switch key 51. Or it is arranged on two sides, three sides or all around the switch key 51.

[0092] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An adapter, characterized in that: include: case; A control circuit is located in the accommodating cavity formed by the shell; A plurality of battery pack interfaces configured to receive a battery pack capable of powering the power tool; A USB interface, configured to connect to at least a power-consuming device and / or a charger; Wherein, the control circuit at least includes: A power circuit configured to control the USB interface to transmit power; The controller is configured to detect the electrical signals of each battery pack interface to determine the parameters of the battery pack connected to the adapter, and control the power circuit to control the power transmission power of the USB interface according to the parameters of the battery pack.

2. The adapter according to claim 1, characterized in that: The electrical signal of each battery pack interface includes at least: a voltage signal and / or a resistance signal.

3. The adapter according to claim 1, characterized in that: The USB interface includes: a bidirectional transmission interface; the power circuit includes a first power circuit; When the bidirectional transmission interface is electrically connected to a first power-consuming device, the first power circuit is used to control the discharge power of the battery pack to the first power-consuming device according to the parameters of the battery pack; When the bidirectional transmission interface is electrically connected to the charger, the first power circuit is used to control the charging power of the charger to the battery pack according to the parameters of the battery pack.

4. The adapter according to claim 1, characterized in that: The USB interface includes: a unidirectional transmission interface for electrically connecting to a second electrical device; The power circuit includes a second power circuit, which is used to control the discharge power of the battery pack to the second power-consuming device according to the parameters of the battery pack when the unidirectional transmission interface is electrically connected to the second power-consuming device.

5. The adapter according to claim 1, characterized in that: The controller is configured to: obtain the electrical signal of each battery pack interface, and determine the battery pack parameters in combination with the electrical signal of each battery pack interface.

6. The adapter according to claim 5, characterized in that: The plurality of battery pack interfaces include a first type of interface and a second type of interface; The first type of interface is set in one-to-one correspondence with the universal port of each battery pack, and the second type of interface is set in one-to-one correspondence with the specific port of at least one type of battery pack; The controller is configured to determine that the battery pack parameter is a first-category parameter when detecting at least one electrical signal of the first-category interface and at least one electrical signal of the second-category interface; The controller is configured to determine that the battery pack parameter is a second-type parameter when at least one electrical signal of the first-type interface is detected and no electrical signal of the second-type interface is detected.

7. The adapter according to claim 3, characterized in that: The first power circuit comprises: An electric energy control unit, used to obtain parameters of the battery pack and control the electric energy conversion circuit to perform electric energy conversion according to the parameters of the battery pack; An electric energy conversion circuit is used to convert the power signal provided by the battery pack into electric energy and output it to the first electric device under the control of the electric energy control unit when the bidirectional transmission interface is electrically connected to the first electric device; and is used to convert the electrical signal provided by the charger into electric energy and output it to the battery pack under the control of the electric energy control unit when the bidirectional transmission interface is electrically connected to the charger.

8. The adapter according to claim 3, characterized in that: The control circuit also includes: The charge / discharge switch circuit is configured to control the on / off state of the first power circuit.

9. The adapter according to claim 6, characterized in that: The first type of interface at least includes a positive electrode interface, a negative electrode interface and a collection / communication interface; the control circuit also includes: A first capacitor, electrically connected between the positive electrode interface and the ground terminal; A discharge circuit, comprising a discharge input terminal, a discharge output terminal and a discharge control terminal; the discharge input terminal is electrically connected to the positive electrode interface, the discharge output terminal is electrically connected to the ground terminal, and the discharge control terminal is electrically connected to the controller; The controller is also used to determine a preset connection state of the battery pack according to the electrical signal of the acquisition / communication interface C1 / D, and when it is determined according to the preset connection state that the battery pack and the battery pack interface are all disconnected, control the discharge circuit to discharge the electrical energy stored in the first capacitor.

10. The adapter according to claim 9, characterized in that The controller is further configured to determine an actual connection state of the battery pack according to an electrical signal of the positive electrode interface after controlling the discharge circuit to discharge the electrical energy stored in the first capacitor.

11. The adapter according to claim 9, characterized in that: The discharge circuit includes a discharge resistor and a first control switch; The first end of the first control switch is electrically connected to the positive electrode interface through the discharge resistor, the second end of the first control switch is electrically connected to the ground end, and the control end of the first control switch is electrically connected to the controller; The first control switch is used to be turned on or off under the control of the controller.

12. The adapter according to claim 8, characterized in that The controller further comprises: The protection module is used to control the charge / discharge switch circuit to be disconnected when the charging voltage output by the charger to the battery pack is greater than the charging protection voltage of the battery pack.

13. The adapter according to claim 8, characterized in that The control circuit further comprises: A secondary protection unit is used to determine the charging voltage of the battery pack according to at least one electrical signal of the battery pack interface, and control the charge / discharge switch circuit to be disconnected when the charging voltage is greater than the secondary charging protection voltage of the battery pack.

14. The adapter according to claim 8, characterized in that The control circuit is arranged on a circuit board; the switch key is arranged on the circuit board and is configured to at least control the charging / discharging of the adapter; the indicator light is arranged on the circuit board and is adjacent to at least one side of the switch key.

Images