Charging circuit and electric tool

Abstract

The utility model relates to a charging circuit and an electric tool. The charging circuit comprises a power management module, a power supply output port and a battery module. The first input end of the power management module is connected with an external power supply. The output end of the power management module is connected with the power supply output port. The power supply output port is used for connecting a power utilization module; the battery module is provided with a battery port, and the battery port is electrically connected to a connection node between the output end of the power management module and the power supply output port; wherein when the output end of the power management module outputs a first charging current and the power utilization module is in a non-working state, the first charging current flows to the battery port from the connection node; when the output end of the power management module outputs a first charging current and the power utilization module is in a working state, the first charging current flows to the power supply output port from the connection node. Through the charging circuit provided by the invention, the power utilization module works under the condition that the external power supply supplies power, and the problem of endurance anxiety of a product is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of charging of electric products, and in particular to a charging circuit and an electric tool. Background Art

[0002] Power tools are commonly used tools in production and life scenarios. Power tools include electric screwdrivers, electric drills, air pumps or electric scissors, etc.

[0003] At present, most electric tools use motors as transmission devices to work, wherein the motor, as a power-consuming module, completes the actual transmission work by obtaining electric energy provided by a built-in battery module.

[0004] However, the motors of many power tools have large operating currents and high power consumption, and the built-in battery modules cannot provide long-lasting battery life, so there is an obvious battery life anxiety problem when using power tools. Utility Model Content

[0005] In order to overcome the problems existing in the related art, the present disclosure provides a charging circuit and an electric tool. Through the charging circuit proposed in the present disclosure, the power module can work when powered by an external power supply, thereby improving the product endurance anxiety problem.

[0006] The embodiment of the present disclosure provides a charging circuit, the charging circuit comprising: a power management module, a power supply output port and a battery module;

[0007] The first input end of the power management module is connected to an external power source, and the output end of the power management module is connected to the power supply output port;

[0008] The power supply output port is used to connect to the power consumption module;

[0009] The battery module has a battery port, and the battery port is electrically connected to a connection node between the output end of the power management module and the power supply output port;

[0010] Among them, when the first charging current is output at the output end of the power management module and the power module is in a non-working state, the first charging current flows from the connection node to the battery port; when the first charging current is output at the output end of the power management module and the power module is in a working state, the first charging current flows from the connection node to the power supply output port.

[0011] In some embodiments, the charging circuit further includes a switch module;

[0012] The switch module is electrically connected to a connection branch between the connection node and the battery port;

[0013] Wherein, when the switch module is in the first switch state, the connection branch is turned on, and the first charging current flows from the connection node to the battery port;

[0014] When the switch module is in the second switch state, the connection branch is disconnected, and the first charging current flows from the connection node to the power supply output port;

[0015] When the switch module is in the third switch state, the connection branch is turned on, and the second charging current output by the battery module flows from the battery port to the connection node.

[0016] In some embodiments, the switch module includes a first switch component and a second switch component;

[0017] The first switch component at least includes a diode, the anode of the diode is connected to the battery port, and the cathode of the diode is connected to the connection node;

[0018] The second switch component is connected in parallel with the first switch component;

[0019] Wherein, when the second switch component is in the on state and the diode is in the reverse biased state, the switch module is in the first switch state or the third switch state;

[0020] When the second switch component is in an off state and the diode is in a reverse biased state, the switch module is in the second switch state;

[0021] When the second switch component is in the disconnected state and the diode is in the forward biased state, the switch module is in the third switch state.

[0022] In some embodiments, the charging circuit further includes a control module;

[0023] The control module has a first control port;

[0024] The first control port is electrically connected to the second switch component, and the first control port is used to output the first charging current at the output end of the power management module, and output a first signal when the power module is in a working state; the first control port is also used to output the first charging current at the output end of the power management module, and output a second signal when the power module is in a non-working state;

[0025] The first signal is used to put the second switch component in an off state; the second signal is used to put the second switch component in an on state.

[0026] In some embodiments, the second switch component includes a field effect transistor;

[0027] The first control port is further configured to output a third signal when the output end of the power management module does not output the first charging current and the power consumption module is in a working state;

[0028] The third signal is used to put the field effect tube into a conducting state.

[0029] In some embodiments, the charging circuit further comprises a charging management module, wherein the charging management module has a variable impedance component;

[0030] The charging management module is electrically connected to the second input terminal of the power management module;

[0031] Wherein, the impedance value of the variable impedance component is different, and the current value of the first charging current outputted from the output end of the power management module is different.

[0032] In some embodiments, the control module of the charging circuit includes a second control port;

[0033] The second control port is electrically connected to the variable impedance component, and the second control port is used to output a control signal; wherein when the control signal output by the second control port is different, the impedance value of the variable impedance component is different.

[0034] In some embodiments, the variable impedance component includes a first impedance element, a second impedance element, and a switch element;

[0035] After the second impedance element and the switch element are connected in series, they are connected in parallel with the first impedance element;

[0036] The switch element is electrically connected to the second control port;

[0037] Wherein, when there is current input at the first input end of the power management module and the power module is in a non-working state, the control signal is a fourth signal; when there is current input at the first input end of the power management module and the power module is in a working state, the control signal is a fifth signal;

[0038] The fourth signal is used to put the switch element in an off state, and the fifth signal is used to put the switch element in an on state.

[0039] In some embodiments, the switch element includes a transistor or a field effect transistor.

[0040] In some embodiments, the charging circuit further includes an external power supply module;

[0041] The input end of the external power supply module is electrically connected to the external power supply, and is used to obtain the power supply current of the external power supply;

[0042] The first input end of the power management module is electrically connected to the output end of the external power supply module, and the power management module is used to obtain the first charging current based on the power supply current of the external power supply.

[0043] The present disclosure also provides an electric tool, comprising:

[0044] A power consumption module, and a charging circuit as described in the above embodiments of the present disclosure;

[0045] The power-consuming module is electrically connected to the power supply output port of the charging circuit, and the power-consuming module is used to at least obtain a first charging current output by the power supply output port.

[0046] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0047] In the embodiment of the present disclosure, a power management module, a power output port and a battery module are provided. When there is energy input from an external power source, that is, the output end of the power management module outputs a first charging current, if the power-consuming module is in a working state, the first charging current can be transmitted to the power-consuming module instead of to the battery module. At this time, not only can the power-consuming module work under the power of an external power source, thereby increasing the sustainable working time of the power-consuming module and improving the problem of product endurance anxiety; it can also reduce the unnecessary loss caused by continuously allocating charging current to the battery module, thereby further improving the working stability of the power-consuming module. At the same time, the embodiment of the present disclosure can also charge the battery module when the power-consuming module is in a non-working state, so that the battery module can effectively store electrical energy, thereby making the power-consuming module available in scenarios without an external power source.

[0048] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0050] Figure 1 is a schematic diagram of a charging circuit according to an exemplary embodiment. Figure 1 ;

[0051] Figure 2 is a structural schematic diagram of a switch module in a charging circuit according to an exemplary embodiment;

[0052] Figure 3 is a schematic diagram of a charging circuit according to an exemplary embodiment. Figure 2 ;

[0053] Figure 4 is a circuit topology diagram showing a charging circuit according to an exemplary embodiment;

[0054] Figure 5 is a schematic structural diagram of an electric tool according to an exemplary embodiment;

[0055] Figure 6 The structure frame of the electric tool according to an exemplary embodiment is shown Figure 1 ;

[0056] Figure 7 The structure frame of the electric tool according to an exemplary embodiment is shown Figure 2 . DETAILED DESCRIPTION

[0057] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0058] See also Figure 1 , Figure 1 is a schematic diagram of a charging circuit according to an exemplary embodiment. Figure 1 The charging circuit 1 proposed in the present disclosure comprises: a power management module 11, a power supply output port 12 and a battery module; a first input end of the power management module 11 is connected to an external power supply, and an output end of the power management module 11 is connected to the power supply output port 12; the power supply output port 12 is used to connect a power-consuming module; the battery module has a battery port 13, and the battery port 13 is electrically connected to a connection node a between the output end of the power management module 11 and the power supply output port 12; wherein, when a first charging current is output at the output end of the power management module 11 and the power-consuming module is in a non-working state, the first charging current flows from the connection node a to the battery port 13; when a first charging current is output at the output end of the power management module 11 and the power-consuming module is in a working state, the first charging current flows from the connection node a to the power supply output port 12.

[0059] It should be noted that the electric tool used in the charging circuit in the present disclosure is a mechanized tool that uses a small-capacity motor as a transmission device to drive a working head to perform operations, and has the characteristics of being small and portable. Among them, the electric tools in the present disclosure include electric grinding pens, electric screwdrivers, electric drills, air pumps, electric wrenches, electric chain saws, electric scissors, etc. These electric tools are widely used in various fields such as industrial manufacturing, forestry processing, road construction, public cleaning, and household daily use, which can improve labor efficiency and reduce labor costs.

[0060] In the embodiment of the present disclosure, the charging circuit includes a power management module, the first input end of which is connected to an external power source for obtaining a power supply current provided by the external power source; the power management module can output a first charging current based on the power supply current provided by the external power source. The power management module can process the power supply current and output the first charging current; the processing of the power supply current includes but is not limited to: AC to DC conversion, or adjusting the current size, direction, frequency and cycle, etc.

[0061] In the embodiment of the present disclosure, the power supply output port is a port electrically connected to the power module, and is used to output a charging current to the power module so as to use the power module to work; in the embodiment of the present disclosure, the charging current output by the power supply output port may include a first charging current obtained based on the power supply current provided by the external power source and / or a second charging current provided by the battery module. Here, the charging current output from the power supply output port is a direct current.

[0062] It should be noted that the battery module includes a battery built into the power tool, and the battery includes a lithium battery, a lithium-ion battery, a nickel-metal hydride battery or a dry cell, etc. The battery module has a battery port, and the battery port includes a battery positive electrode port and a battery negative electrode port; because the above-mentioned connection node is electrically connected to both the battery port and the power supply output port, when there is no power supply current input from the external power supply, the battery module can also output a second charging current to the power supply output port through the battery port, thereby supplying power to the power-consuming module through the battery module.

[0063] Here, the above-mentioned power-consuming module is the load in the power tool, and the load can work continuously based on the charging current output by the power supply output port; the load includes transmission devices such as motors, control modules, button modules, detection modules, display modules and other functional modules in the power tool.

[0064] It should be noted that the power consumption module includes a non-working state and a working state; among them, the non-working state includes a shutdown state, and the working state includes a standby state and an operating state; taking the power consumption module including a motor as an example, the standby state is manifested as the motor has been powered on and is on standby but has not started to rotate, and the operating state is manifested as the motor has started to rotate and consume electrical energy.

[0065] In the disclosed embodiment, a detection module is provided in the electric tool, and the detection module includes a temperature detection module, and the temperature detection module is used to detect the device temperature of the electric tool, the battery temperature, etc.; the detection module also includes a charging status detection module, and the charging status detection module is used to detect whether there is a power supply current input from the external power supply, and whether the power module is in a working state. Here, there is an electrical connection between the detection module and the control module of the electronic device, and the control module can control the flow direction of the first charging current.

[0066] Among them, the electric tool also includes a power switch arranged between the power output port and the power-consuming module, and a button module, the button module includes a power button, the power button is used to adjust the on state or off state of the power switch; when the detection module detects that the power switch is in the on state, it is determined that the power-consuming module is in a working state; when the detection module detects that the power switch is in the off state, it is determined that the power-consuming module is in a non-working state.

[0067] In the embodiment of the present disclosure, when the charging circuit is electrically connected to the external power supply and the external power supply has energy input, the output end of the power management module can output a first charging current; at this time, if the power-consuming module is in a working state, it needs to consume electric energy. Since the output end of the power management module is electrically connected to the power output port and the power switch is in a conducting state, the energy output by the external power supply can be transmitted to the power-consuming module through the first charging current; in this way, the power-consuming module of the electric tool can continue to work when powered by an external power supply. Compared with only obtaining the power of the built-in battery module of the electric tool, the working time can be longer and the working state is more stable, thereby improving the endurance anxiety problem of the electric tool. On the contrary, if the power-consuming module is in a non-working state, that is, the power switch is in a disconnected state, since the output end of the power management module is electrically connected to the battery port through a connecting node, the energy output by the external power supply can be transmitted to the battery module through the first charging current, thereby storing electric energy for the electric tool, so that the electric tool can be used in a scene without an external power supply.

[0068] In the disclosed embodiment, a switch module may be provided between the connection node and the battery port, and at least one or a combination of an adjustable capacitance element or an adjustable resistance element may also be provided between the connection node and the battery port.

[0069] Taking the setting of an adjustable capacitance element between the connection node and the battery port as an example, when the first charging current is output at the output end of the power management module and the power module is in the working state, the present disclosure can increase the capacitive reactance value of the adjustable capacitance element to form an open circuit between the connection node and the battery port, so that the first charging current can only be transmitted to the power module, and cannot be transmitted to the battery module; here, if the power management module charges the battery module and the power module at the same time based on the energy of the external power supply, on the one hand, it will cause the power tool to heat up quickly, thereby affecting the use effect of the power tool, and on the other hand, it will cause the power module to be unable to work stably due to uneven current distribution, or the battery module will be damaged due to high current charging, etc. A series of problems. In this way, the embodiment of the present disclosure sets a switch module, or sets at least one or a combination of an adjustable capacitance element / adjustable resistance element, so that the first charging current is only transmitted to the power module in the working state instead of the battery module, thereby reducing the redundant loss caused by continuously distributing the charging current to the battery module, and further improving the stability of the working state of the power tool. Furthermore, when the first charging current is output at the output end of the power management module and the power consumption module is in a non-working state, the present disclosure can reduce the capacitive reactance value of the adjustable capacitor element, so that the first charging current cannot be transmitted to the power consumption module, but can be transmitted to the battery module, thereby charging the battery module.

[0070] In the embodiment of the present disclosure, a power management module, a power output port and a battery module are provided. When there is energy input from an external power source, that is, the output end of the power management module outputs a first charging current, if the power-consuming module is in a working state, the first charging current can be transmitted to the power-consuming module instead of to the battery module. At this time, not only can the power-consuming module work under the power of an external power source, thereby increasing the sustainable working time of the power-consuming module and improving the problem of product endurance anxiety; it can also reduce the unnecessary loss caused by continuously allocating charging current to the battery module, thereby further improving the working stability of the power-consuming module. At the same time, the embodiment of the present disclosure can also charge the battery module when the power-consuming module is in a non-working state, so that the battery module can effectively store electrical energy, thereby making the power-consuming module available in scenarios without an external power source.

[0071] In some embodiments, in combination Figure 1 The charging circuit 1 also includes a switch module 14; the switch module 14 is electrically connected to a connection branch between the connection node a and the battery port 13; wherein, when the switch module 14 is in a first switch state, the connection branch is turned on, and a first charging current flows from the connection node a to the battery port 13; when the switch module 14 is in a second switch state, the connection branch is disconnected, and the first charging current flows from the connection node a to the power supply output port 12; when the switch module 14 is in a third switch state, the connection branch is turned on, and a second charging current output by the battery module flows from the battery port 13 to the connection node a.

[0072] Here, the switch module may include a combination of multiple crystal switch tubes, or a combination of one or more mechanical switches, or a combination of one or more mechanical switches and at least one crystal switch tube, and the present disclosure does not limit this.

[0073] The embodiment of the present disclosure sets the switch modules in different switch states respectively, so that the connection branch between the connection node and the battery port is in different current transmission states; illustratively: when the switch module is in the second switch state, the connection branch is in the disconnected state; when the switch module is in the first switch state or the third switch state, the connection branch is in the on state, but the flow direction of the charging current flowing in the connection branch is different in these two switch states; in this way, the embodiment of the present disclosure can achieve different power supply conditions for the power tool at different power usage times by adjusting the switch state of the switch module.

[0074] In some exemplary power supply scenarios, when the load current of the power-consuming module is less than the first charging current output by the power management module, the power-consuming module can operate stably under the power supply of the external power supply without the need for additional power supply from the battery module; at this time, the present disclosure can adjust the switch module to be in the second switch state to make the connecting branch in a disconnected state; in this way, not only the first charging current cannot flow to the battery module, that is, the external power supply cannot power the battery module, but also the second charging current cannot flow to the connecting node, that is, the battery module cannot power the power-consuming module; in this case, the power-consuming module of the power tool can be plugged in and used, which neither consumes the power of the battery module nor reduces the additional loss of charging the battery module.

[0075] In other exemplary power supply scenarios, when the load current of the power-consuming module is greater than the first charging current output by the power management module, the power-consuming module requires more power to operate stably; at this time, the embodiment of the present disclosure can adjust the switch module to be in a third switching state, at which time the connecting branch is in a conducting state, and the second charging current provided by the battery module can flow to the connecting node; in this case, the power-consuming module of the power tool is powered by both the external power supply and the battery module, which improves the working effectiveness and stability of the power-consuming module.

[0076] In other exemplary power supply scenarios, when the output end of the power management module outputs a first charging current and the power consumption module is in a non-working state, the embodiment of the present disclosure can monitor the power level of the battery in the battery module; if the battery power is not fully charged, the embodiment of the present disclosure can adjust the switch module to be in a first working state, at which time the connecting branch is in a conducting state, and the first charging current can flow from the connecting node to the battery module; in this case, the external power supply can power the battery module until it reaches a full charge, and then disconnect from the external power supply.

[0077] In other exemplary power supply scenarios, when the charging current is not connected to an external power supply, that is, the power management module does not output the first charging current, the present disclosure can adjust the switch module to be in a third switching state, at which time the connecting branch is in a conductive state, and the second charging current provided by the battery module can flow to the connection node; in this case, the power module of the power tool is powered by the battery module, so that the power tool is still available without an external power supply.

[0078] It should be noted that the embodiments of the present disclosure can set different components in the switch module to complete the setting of different current flow directions, that is, control the switch module to switch between the third switch state and the first switch state; for example, the present disclosure can adjust the flow of the first charging current in the connection branch, or adjust the flow of the second charging current in the connection branch by setting a current reversing component; here, the current reversing component includes a commutator brush, a rectifier element, etc. The embodiments of the present disclosure can also set different sub-branches in the switch module, and each sub-branch is provided with a unidirectional conducting element with a different bias direction, so that the present disclosure can realize the directional transmission of current by conducting different sub-branches.

[0079] Exemplarily, a single-pole three-throw switch, two commutator brushes and a large-resistance resistor are provided in the switch assembly; here, the large-resistance resistor is used to realize the circuit opening; the two commutator brushes are in opposite directions; the three output pins of the single-pole three-throw switch are respectively connected to the two commutator brushes and the large-resistance resistor. In this way, in the above-mentioned different power supply scenarios of the present disclosure, the three output pins of the single-pole three-throw switch are controlled to be connected to different devices respectively, so as to realize that different switch modules are in the above-mentioned three different switch states.

[0080] In the embodiment of the present disclosure, a switch module is set to switch between a first switch state, a second switch state, and a third switch state, so that the charging circuit can reasonably supply power to the battery module or the power module in different power supply scenarios, thereby improving the power supply effect of the charging circuit.

[0081] In some embodiments, see Figure 2 , Figure 21 is a schematic diagram of the structure of a switch module in a charging circuit according to an exemplary embodiment; the switch module 14 includes a first switch component 141 and a second switch component 142; the first switch component 141 includes at least a diode D1, the positive electrode of the diode D1 is connected to the battery port 13, and the negative electrode of the diode D1 is connected to the connection node a; the second switch component 142 is connected in parallel with the first switch component 141; wherein, when the second switch component 142 is in the on state and the diode D1 is in the reverse biased state, the switch module 14 is in the first switch state or the third switch state; when the second switch component 142 is in the off state and the diode D1 is in the reverse biased state, the switch module 14 is in the second switch state; when the second switch component 142 is in the off state and the diode D1 is in the forward biased state, the switch module 14 is in the third switch state.

[0082] Here, the first switch component and the second switch component are connected in parallel, and are connected in parallel on the connection line between the above-mentioned connection node and the battery port; in this way, the first switch component and the second switch component can cooperate with each other to realize that the switch module is in different switching states.

[0083] In the embodiment of the present disclosure, the first switch component includes a diode; wherein the diode is an electronic device made of semiconductor materials (such as silicon, selenium, germanium, etc.), and the working principle of the diode is mainly based on the unidirectional conductivity of the PN junction to achieve a unidirectional conduction function; the diode has two electrodes: a positive electrode and a negative electrode. When a forward voltage is applied between the two electrodes of the diode, that is, the voltage of the positive electrode is greater than the voltage of the negative electrode, and the difference between the positive electrode voltage and the negative electrode voltage exceeds the voltage threshold, a forward current will be generated, and the diode will be forward biased and turned on; when a reverse voltage is applied between the two stages of the diode, that is, the difference between the positive electrode voltage and the negative electrode voltage of the diode is less than or equal to the above voltage threshold, the diode will be reverse biased and turned off. It should be noted that the on and off characteristics of the above-mentioned diode are equivalent to the on and off of the switch. In this way, the embodiment of the present disclosure realizes the on state and off state of the first switch component through the unidirectional conductivity of the diode.

[0084] In the embodiment of the present disclosure, the first switch component may include only one diode, or include multiple diodes with the same bias direction and arranged in series, or be composed of a diode and an impedance element.

[0085] In the disclosed embodiment, the second switch component is arranged in parallel with the first switch component, and the second switch component has an off state and an on state; wherein the on state of the second switch component is a unidirectional on state or a bidirectional on state.

[0086] In some examples, the second switch assembly can be provided with another diode and a mechanical switch to cooperate to realize a unidirectional conduction state, the positive pole of the other diode is electrically connected to the above-mentioned connection node, and the negative pole is electrically connected to the battery port; in this way, when the other diode of the second switch assembly is forward biased and the mechanical switch is closed, if there is a first charging current, the first charging current can flow to the battery port through the other diode. In other examples, the second switch assembly can also be provided with a separate mechanical switch or an electrically controlled switch (such as a transistor, a field effect transistor) and other devices to realize a bidirectional conduction state. When a separate mechanical switch or an electrically controlled switch in the second switch assembly is closed, the first charging current can flow to the battery port through the second switch assembly, and when there is no first charging current flowing in the charging current, the second charging current can flow to the connection node through the second switch assembly until the power supply output port.

[0087] It should be noted that since the diode will only be forward biased when the positive voltage is greater than the negative voltage and the difference between the positive voltage and the negative voltage exceeds the voltage threshold, the embodiment of the present disclosure can control the voltage at the connection node and the state of the second switch component to adjust the switching state of the switch module, thereby achieving different power supply requirements in different power supply scenarios.

[0088] For example, when the power management module outputs the first charging current and the load current of the power module is less than the first charging current, the second switch component can be controlled to be in the disconnected state. In this way, due to the power supply of the external power supply, the voltage at the connection node is greater than the voltage of the battery port. At this time, the diode in the first switch component is in a reverse biased state, and the switch module is in the second switch state; the first charging current will flow to the power supply output port, but cannot flow to the battery module.

[0089] For another example, when the power management module outputs the first charging current and the load current of the power module is greater than the first charging current, the embodiment of the present disclosure can control the second switch component to be in a disconnected state. At this time, since the power module continuously extracts energy from the connection node voltage, the voltage at the connection node is less than the voltage of the battery port. At this time, the diode in the first switch component is in a forward biased state, and the switch module is in the third switch state; the second charging current will flow from the battery port through the diode in the first switch component to the connection node.

[0090] For another example, when the power management module outputs the first charging current but the power module is in a non-working state, the embodiment of the present disclosure can control the second switch component to be in a unidirectional conduction state or a bidirectional conduction state. In this way, due to the power supply of the external power supply, the voltage at the connection node is greater than the voltage of the battery port, and the diode in the first switch component is in a reverse biased state. At this time, the switch module is in the first switch state; the first charging current will flow to the battery module.

[0091] For another example, when the power management module does not output the first charging current, but the power consumption module is in working state, the embodiment of the present disclosure can control the second switch component to be in a bidirectional conduction state. In this way, because the voltage at the connection node is equal to or slightly less than the voltage of the battery port, the diode in the first switch component is reverse biased. At this time, the second charging current output by the battery module will flow to the power consumption module.

[0092] By setting a diode, the embodiment of the present disclosure can forward bias the diode when the external power supply to the power-consuming module is insufficient, so as to realize simultaneous power supply of the external power supply and the battery module, thereby improving the working stability of the power-consuming module; it can also realize the external power supply to supply power to the battery module or the power-consuming module separately in different power supply scenarios by reverse biasing the diode in conjunction with the on and off states of the second switch component, thereby reducing excess power loss.

[0093] In some embodiments, in combination Figure 1 and Figure 2 The charging circuit 1 also includes a control module; the control module has a first control port 15; the first control port 15 is electrically connected to the second switch component 142, and the first control port 15 is used to output the first charging current at the output end of the power management module 11, and output the first signal when the power module is in a working state; the first control port 15 is also used to output the first charging current at the output end of the power management module 11, and output the second signal when the power module is in a non-working state; wherein the first signal is used to make the second switch component 142 in a disconnected state; the second signal is used to make the second switch component 142 in a conducting state.

[0094] Here, the control module is arranged on the host control board of the electric tool, and is electrically connected to the detection module, power management module, transmission device drive module, power consumption module, button module, display module, etc.; the control module serves as the control center of the electric tool; in the present disclosure, the control module includes a microcontroller unit (MCU), and the MCU unit is used to obtain button interaction information, temperature monitoring data, connection status data of the external power supply, and working status data of the power consumption module, so as to output electrical signals for controlling the operation of the above-mentioned multiple functional modules.

[0095] In the embodiment of the present disclosure, when the detection module detects that the first charging current is output in the power management module and the power module is in a working state, the MCU unit outputs a first signal to the second switch component connected to the first control port through the first control port to control the second switch component to be in a disconnected state, so that no matter whether the diode in the first switch component is forward biased or reverse biased, the first charging current will not flow from the connection node to the battery module, thereby saving unnecessary losses; when the detection module detects that the first charging current is output in the power management module and the power module is in a non-working state, the MCU unit outputs a second signal to the second switch component through the first control port to control the second switch component to be in a conducting state, at which time the external power supply can effectively charge the battery module.

[0096] It should be noted that the second signal is a signal different from the first signal, which may be specifically manifested as a different level state, or a different signal value, a different period / frequency, and the like.

[0097] The embodiment of the present disclosure sets a control module and a first control port thereof, which can flexibly control the on or off state of the second switch component, thereby effectively adapting to the power supply requirements of different power supply scenarios.

[0098] In some embodiments, in combination Figure 1 and Figure 2 , the second switch component 142 includes a field effect transistor;

[0099] The first control port 15 is further used to output a third signal when the output end of the power management module 11 does not output the first charging current and the power module is in working state; wherein the third signal is used to turn on the field effect transistor.

[0100] Here, Field Effect Transistor (FET) is a semiconductor device. Field effect transistor uses electrostatic field to control the flow of current; field effect transistor includes gate, source and drain. Among them, gate is the electrode that controls the current, source is the electrode for current to enter the tube, and drain is the electrode for current to flow out of the tube. There are two main types of field effect transistors: junction field effect transistor and metal-oxide semiconductor field effect transistor (MOS-FET). The conductive principle of field effect transistor is: when the gate voltage is zero, the tube is in the cut-off state; when the gate voltage increases, electrons conduct electricity under the influence of the gate electric field to form a current path; when the gate voltage decreases below the cut-off voltage, the field effect transistor re-enters the cut-off state and the current is blocked.

[0101] in, Figure 2The second switch component 142 shown includes a field effect transistor Q1, which is connected in parallel with the diode D1 in the first switch component 141. The field effect transistor Q1 can be a PMOS transistor or an NMOS transistor. Taking the field effect transistor Q1 as an NMOS transistor as an example, the gate G of the NMOS transistor is connected to the first control port 15, the source S of the NMOS transistor is electrically connected to the connection node a, and the drain D is electrically connected to the battery port 13.

[0102] It should be noted that the on state of the field effect transistor Q1 may correspond to the on state of the second switch component, and the off state of the field effect transistor Q1 may correspond to the off state of the second switch component.

[0103] In the embodiment of the present disclosure, the third signal output by the first control port is the same as the first signal and different from the second signal; wherein the third signal and the first signal may be high-level signals, and the second signal may be a low-level signal.

[0104] Here, taking the field effect tube Q1 as an NMOS tube as an example, when the detection module detects that the power management module does not output the first charging current and the power module is in a working state, the MCU unit can output a third signal (high level signal) to the gate G of the NMOS tube through the first control port to turn on the NMOS tube, so that the second charging current output by the battery module can flow to the power supply output port; in this way, the second charging current is transmitted by the field effect tube Q1, which reduces the circuit loss compared to the second charging current transmitted by the diode D1. When the detection module detects that the power management module outputs the first charging current and the power module is in a working state, the MCU unit outputs a first signal (low level signal) to the gate G of the NMOS tube through the first control port to turn off the NMOS tube; and when the detection module detects that the power management module outputs the first charging current and the power module is in a non-working state, the MCU unit outputs a second signal (high level signal) to the gate G of the NMOS tube through the first control port to turn on the NMOS tube.

[0105] In the embodiment of the present disclosure, by setting the field effect transistor in the second switch component, the on or off state of the second switch component can be flexibly achieved, thereby adapting to the power supply requirements of different power supply scenarios.

[0106] In some embodiments, see Figure 3 , Figure 3 is a schematic diagram of a charging circuit according to an exemplary embodiment. Figure 2 Combination Figures 1 to 3The charging circuit 1 also includes a charging management module 16, which has a variable impedance component; the charging management module 16 is electrically connected to the second input end of the power management module 11; wherein, the impedance value of the variable impedance component is different, and the current value of the first charging current output from the output end of the power management module 11 is different.

[0107] Here, a variable impedance component is provided in the charging management module, which cooperates with the control module of the charging circuit to adjust the different power supply capabilities of the power management module to meet the power supply requirements in different power supply scenarios.

[0108] The power management module is integrated on the charging chip (charging IC), the output end of the charging IC is electrically connected to the above-mentioned connection node, the first input end of the charging IC is connected to the external power supply, and the second input end of the charging IC is electrically connected to the charging management module; the variable impedance component of the charging management module is arranged between the second input end of the charging IC and the ground line. The embodiment of the present disclosure adjusts the impedance value of the variable impedance component so that the current input by the external power supply generates different degrees of consumption on the variable impedance components with different impedance values. In this way, the output end of the power management module can output the first charging current with different current values, thereby realizing different current charging modes.

[0109] Among them, the variable impedance component can be composed of one or more elements of a variable capacitance element, a variable resistance element, and a variable inductance element; the variable impedance component can also be composed of a fixed resistor and different switching elements; the purpose of setting up the variable impedance component in the embodiment of the present disclosure is to adjust the overall impedance value of the variable impedance component, and the specific composition structure of the variable impedance component will not be further limited here.

[0110] It should be noted that the embodiment of the present disclosure can adjust the impedance value of the variable impedance component according to the actual needs of the power module and the battery module; here, when the power module is in a working state, the embodiment of the present disclosure can adjust the impedance value of the variable impedance component to match the load current required by the power module; when the power module is in a non-working state, the embodiment of the present disclosure can adjust the impedance value of the variable impedance component to match the maximum rated charging current required by the battery module.

[0111] The disclosed embodiment adjusts the impedance value of the variable impedance component so that the power management module can output the first charging current with different current values, thereby improving the diversity of charging modes in power supply scenarios.

[0112] In some embodiments, in combination Figures 1 to 3 The control module of the charging circuit 1 includes a second control port 17; the second control port 17 is electrically connected to the variable impedance component, and the second control port 17 is used to output a control signal; wherein, when the control signal output from the second control port is different, the impedance value of the variable impedance component is different.

[0113] In the disclosed embodiment, the MCU unit can output different control signals based on the detection result of the detection module on the working status of the power module.

[0114] Exemplarily, when it is detected that the power-consuming module is in a working state, the MCU unit outputs a control signal to the variable impedance component through the second control port to reduce the impedance value of the variable impedance component, so that the charging IC can output a large current to power the power module; when it is detected that the power-consuming module is in a non-working state, the MCU unit outputs another control signal to the variable impedance component through the second control port to reduce the impedance value of the variable impedance component, so that the charging IC can output a small current to power the battery module, thereby reducing damage to the battery module.

[0115] In the embodiment of the present disclosure, the electrical connection between the second control port and the variable impedance component allows the control module to output different control signals through the second control port, so that the power management module can output a first charging current with different current values, thereby improving the diversity of current charging modes provided by the charging circuit.

[0116] In some embodiments, see Figure 4 , Figure 4 is a circuit topology diagram showing a charging circuit according to an exemplary embodiment; Figures 1 to 4 As shown, the variable impedance component includes a first impedance element R1, a second impedance element R2 and a switch element K1; the second impedance element R2 and the switch element K1 are connected in series and then connected in parallel with the first impedance element R1; the switch element K1 is electrically connected to the second control port 17; wherein, when there is current input at the first input end of the power management module 11 and the power module is in a non-working state, the control signal is a fourth signal; when there is current input at the first input end of the power management module 11 and the power module is in a working state, the control signal is a fifth signal; the fourth signal is used to make the switch element K in an off state, and the fifth signal is used to make the switch element K in an on state.

[0117] Here, the first impedance element and the second impedance element may be the same component or different components; illustratively, the first impedance element and the second impedance element may be an inductor element and a resistor element, respectively, or both of them may be resistor elements. Figure 4 The first impedance element R1 and the second impedance element R2 shown are both resistance elements, and the resistance values ​​of the first impedance element R1 and the second impedance element R2 may be the same or different.

[0118] In the embodiment of the present disclosure, because the second impedance element and the switch element are connected in series and then connected in parallel with the first impedance element, when the switch element is in the off state, the impedance value of the variable impedance component is the impedance value of the first impedance element. When the switch element is in the on state, the impedance value of the variable impedance component is the impedance value of the first impedance element and the second impedance element in parallel. Since the impedance value of the variable impedance component becomes smaller after parallel connection, when there is current input at the first input end of the power management module (i.e., the external power supply provides the power supply current), the MCU unit can use different control signals from the second output port to adjust the on state or off state of the switch element, so that the charging IC outputs a first charging current with different current values; in this way, the embodiment of the present disclosure adjusts the first charging current by controlling the signal to be applicable to different power supply scenarios.

[0119] In some examples, when the power module is in a working state, it can be determined that the power module needs a large current to supply power; at this time, the MCU unit outputs a fifth signal through the second control port to put the switch element in a conducting state; in this way, the first impedance element and the second impedance element are connected in parallel, the impedance value of the variable impedance component becomes smaller, and the first charging current output by the power management module is a large current. For example, at this time, the first charging current can be the maximum load current of the power module, 3000 milliamperes (mA). In other examples, when the power module is in a non-working state, it can be determined that an external power supply needs to power the battery module; since high current charging can damage the battery, the MCU unit outputs a fourth signal through the second control port to put the switch element in a disconnected state; in this way, the impedance value of the variable impedance component is the impedance value of the first impedance element, which is larger than the impedance value after parallel connection, so the first charging current output by the power management module is a small current. For example, at this time, the first charging current can be the maximum rated charging current of the battery module, 2100mA.

[0120] It should be noted that the fourth signal is a signal different from the fifth signal, which may be specifically manifested as a different level state, or a different signal value, a different period / frequency, etc.

[0121] The disclosed embodiment includes a first impedance element, a second impedance element and a switch element, and the second impedance element and the switch element are connected in series and then in parallel with the first impedance element, so that the power management module can output a large current to charge the power module to improve the working effect of the power module, and can also output a small current to charge the battery module, thereby reducing the damage to the battery caused by large current charging and improving the service life of the power tool.

[0122] In some embodiments, the switch element K includes a transistor or a field effect transistor Q2.

[0123] In the disclosed embodiment, the switch element may be a transistor or a field effect transistor.

[0124] Taking the switching element K including a transistor as an example, the transistor can be a PNP transistor or an NPN transistor; the working principle of the transistor is based on the forward and reverse bias effects of the PN junction, wherein when a forward voltage is applied between the base (B) and the emitter (E) of the transistor, and a reverse voltage is applied between the collector (C) and the emitter (E), the transistor enters the working state, that is, the on-state of the switching element in the embodiment of the present disclosure.

[0125] For example, Figure 4 The switch element K shown may be an NPN transistor QF1 , wherein the base (B) of the transistor QF1 is connected to the second control port, the emitter (E) is grounded GND, and the collector (C) is connected to the second input terminal of the charging IC.

[0126] In actual implementation, when there is a power supply current input at the first input terminal of the charging IC and the power module is in a non-working state, the control module outputs a fourth signal through the second control port. The fourth signal is a low-level signal. At this time, the base voltage of the transistor QF1 is low, which shows that the transistor QF1 is in a disconnected state. Correspondingly, the impedance value of the variable impedance component corresponding to the charging IC is the large impedance value of the first impedance element, so the current value of the output first charging current is small. In this way, the charging circuit exhibits a small current charging mode, which can realize the charging of the battery module and reduce the risk of damaging the battery due to excessive charging current. On the contrary, when there is a power supply current input at the first input terminal of the charging IC and the power module is in working state, the control module outputs the fifth signal through the second control port. The fifth signal is a high-level signal. At this time, the base voltage of the transistor QF1 is high, which shows that the transistor QF1 is in the on state. Correspondingly, the impedance value of the variable impedance component corresponding to the charging IC is the small impedance value after the first resistance element and the second impedance element are connected in parallel, so the current value of the output first charging current is large. In this way, the charging circuit exhibits a large current charging mode, which can be used to charge the power module so that the power tool can be plugged in and used.

[0127] The disclosed embodiment uses a transistor or a field effect transistor as a switching element, which improves the switching response rate compared to setting a mechanical switch, thereby effectively achieving rapid switching between a low current charging mode and a high current charging mode.

[0128] In some embodiments, in combination Figures 1 to 4 As shown, the charging circuit 1 also includes an external power supply module 18; the input end of the external power supply module 18 is electrically connected to the external power supply, and is used to obtain the power supply current of the external power supply; the first input end of the power management module 11 is electrically connected to the output end of the external power supply module 18, and the power management module 11 is used to obtain a first charging current based on the power supply current of the external power supply.

[0129] In the disclosed embodiment, the external power supply module can process the power supply current provided by the external power supply, and input the processed power supply current to the first input terminal of the power management module. The external power supply module can process the external power supply, including but not limited to filtering, AC to DC conversion, etc.

[0130] Here, the input end of the external power supply module may include a male plug pin and a Universal Serial Bus (USB) port.

[0131] In some examples, the input end of the external power supply module is a male plug pin. The male plug pin is connected to a male plug, which can be connected to a female connector type power socket with a slot, wherein the male plug can obtain energy from the external power supply from the power socket.

[0132] In other examples, the input end of the external power supply module is a USB port; the USB port is used to connect a USB transmission line, which can be directly connected to an external power supply, or connected to an external power supply through an adapter, and transmit a first charging current to the USB port; here, the USB port in the present disclosure includes a USB-A port, a USB-B port, a USB-C port (Type-C port) and a lightning interface (Lightning interface).

[0133] exist Figure 4 In the embodiment, the input end of the external power supply module 18 is a Type-C port, including a Type-C Input+ port and a Type-C Input- port; the external power supply module 18 is electrically connected to the first input end VCC of the charging IC (Charge IC). The external power supply module includes a surge protection circuit, which includes a capacitor C1, a capacitor C2, an inductor R3, a diode Z1 and a capacitor C3. The surge protection circuit can achieve surge protection for the charging circuit through filtering processing, reducing the damage to the internal components of the charging circuit caused by excessive external power supply voltage input.

[0134] It should be noted that the detection module in the present disclosure detects whether the power management module outputs the first charging current, including detecting whether there is current input at the input end of the external power supply module, or detecting changes in electrical parameters in the surge protection circuit of the external power supply module; through the above detection, it is possible to judge the electrical connection between the input end of the external power supply module and the external power supply, and then determine whether the external power supply can provide power to the power-consuming module.

[0135] The embodiment of the present disclosure provides an external power supply module, so that the charging circuit can effectively obtain energy provided by the external power supply, thereby realizing power supply for the power consumption module and the battery module.

[0136] The disclosed embodiment also provides an electric tool.

[0137] See also Figure 5 , Figure 5 is a schematic diagram of the structure of an electric tool according to an exemplary embodiment; Figures 1 to 5 As shown, the electric tool 2 includes a power module 21 and a charging circuit 1 proposed in the above embodiment of the present disclosure; the power module 21 is electrically connected to the power output port 12 of the charging circuit 1, and the power module 21 is used to at least obtain the first charging current output by the power output port 12.

[0138] Here, the electric tool is a mechanized tool that uses a small-capacity motor as a transmission device to drive a working head to perform operations; the electric tools in the present disclosure include electric grinding pens, electric screwdrivers, electric drills, air pumps, electric wrenches, electric chain saws, electric scissors, etc. The electric tool proposed in the embodiment of the present disclosure includes a charging circuit and a power module connected to the charging circuit, and the power module includes an MCU unit, a driving device, a transmission device, a display module, etc.

[0139] Combination Figure 5 With the electric tool 2 proposed in the embodiment of the present disclosure, when the power module 21 of the electric tool is in a non-working state (off state), the power management module 11 can be adjusted to a low-current charging mode to output a first charging current with a small current value, wherein the first charging current charges the battery module through the connection node a, the switch module 14 and the battery port 13; when the power module 21 is in a working state, the power management module 11 can be adjusted to a high-current charging mode to output a first charging current with a large current value, wherein the first charging current charges the power module 21 through the node a and the power supply output port 12.

[0140] In this way, the charging circuit provided in the electric tool of the embodiment of the present disclosure can improve the problem that the electric tool can only be used normally when fully charged, and solve the problem of battery life anxiety during the use of the electric tool.

[0141] Next, an exemplary application of the electric tool proposed in the present disclosure is described in combination with the above-mentioned embodiments of the present disclosure.

[0142] At present, most electric tools in the electric tool field use motors (loads) as transmission devices. The working current of the load (load current) will be greater than the charging current provided by the battery module, and the battery module cannot fully meet the working requirements of the load; but if the adapter is used for power supply, when the load current becomes smaller or the load is turned off, the charging current will exceed the maximum charging current allowed by the battery, and there is a risk of damaging the battery. Therefore, most electric tools on the market (for example, electric screwdrivers, electric drills, air pumps, electric scissors, etc.) cannot be used when charging.

[0143] In order to overcome the above problems, an embodiment of the present disclosure proposes an electric tool, including a charging circuit; the charging circuit can be compatible with an external adapter and flexibly switch between a low current charging mode and a high current charging mode, so that based on the external adapter, the power module can be charged in a high current charging mode and the battery module can be charged in a low current charging mode.

[0144] See also Figure 6 , Figure 6 The structure frame of the electric tool according to an exemplary embodiment is shown Figure 1 ; Combine Figure 5 and Figure 6 The electric tool 2 proposed in the embodiment of the present disclosure includes a power management module 11, a charging management module 16, a power consumption module 21 and a battery module 23; wherein the power consumption module 21 includes a display module 211, a transmission device driving module 212, a transmission device 213, a detection module 214, a button module 215 and a control module 216, etc.

[0145] It should be noted that the above-mentioned charging management module, power management module, transmission device drive module, and temperature detection module in the detection module are all integrated on the host control board of the power tool; the host control board also includes an overvoltage protection (OVP) circuit, a battery temperature detection thermistor (NTC) and its detection circuit in the temperature detection module, a lithium battery protection IC, and a transmission device drive circuit, etc. The modules and circuits on the host control board are coordinated through wiring to form the charging circuit proposed in the embodiment of the present disclosure.

[0146] Here, the power management module is arranged between the power supply output port of the charging circuit and the power consumption module, and is mainly used to transmit charging current to the control module (MCU unit), display module, key module, transmission device drive module, transmission device and other power consumption modules. The main functions of the display module and the key module are to provide human-computer interaction; the transmission device drive module is mainly used to control the motor speed and operation mode; the charging management module is located in the charging circuit, and is mainly used to cooperate with the control signal output by the second output port of the MCU unit, and control the power management module to switch between the high current charging mode and the low current charging mode according to the power demand of the power tool. The MCU unit is mainly responsible for collecting interactive buttons, NTC monitoring data, USB interface status and motor working status, so as to output corresponding control signals.

[0147] Figure 4 The circuit topology diagram of an exemplary charging circuit in the present disclosure is shown, wherein in the charging circuit 1, the output end of the external power supply module 18 includes Type-C Input+ and Type-C Input-, which are interfaces for the external power adapter to power the power tool through the USB interface; the power output port 12 includes System_power, which is an interface for electrically connecting power modules such as MCU units and motors, and the battery port 13 includes BAT+ and BAT-, which are positive and negative ports of the battery module. The first control port 15 includes a Status_set port, and the second control port 17 includes a Current_set port.

[0148] Among them, the power management module 11 (charging IC) includes a first input terminal VCC (pin 1), a second input terminal PROG (pin 2), a full state indication terminal NSTD (pin 3), a charging state indication terminal NCHRG (pin 4), a temperature detection terminal TS (pin 5), a battery state detection terminal BAT (pin 6), a ground terminal (pin 7) and an output terminal LX (pin 8).

[0149] The first input terminal VCC of the power management module 11 is connected to the output terminal VBUS IN of the external power supply module 18 for obtaining the power supply current output by VBUS IN.

[0150] The second input terminal PROG of the power management module 11 is connected to the charging management module; the charging management module includes a first impedance element R1, a second impedance element R2, a transistor QF1, and resistors R4 and R5; the second impedance element R2 and the transistor QF1 are connected in series and then connected in parallel with the first impedance element R1; the base (B) of the transistor QF1 is electrically connected to the Current_set port of the MCU unit, the emitter (E) is grounded GND, and the collector (C) is connected to the second input terminal PROG of the charging IC. Among them, the resistor R4 is used for voltage division processing in the charging management module, and the resistor R5 is used for grounding processing, both of which are used to reduce the adverse effects of external signal loss access on the charging management module.

[0151] The temperature detection terminal TS of the power management module 11 is connected to the temperature detection module, wherein the temperature detection module includes the port Charge EN connected to the control module, and resistors R7, R10 and R11 connected to the output terminal VBUS IN of the external power supply module 18; wherein the emitter of the transistor QF3 is grounded, the collector of the transistor QF3 is connected to the temperature detection terminal TS, and the base of the transistor QF3 is electrically connected to the Charge EN port, and the Charge EN port can output a control signal to turn on or off the transistor QF3, so that the temperature detection module detects temperature changes during the charging process.

[0152] The output terminal LX of the power management module is electrically connected to the connection node a (Vsys) through the inductor L1, and the battery status detection terminal BAT is electrically connected to the node Vsys through the inductor R6; the output terminal LX of the power management module can output a first charging current to the node Vsys; the inductor L1, the inductor R6, the capacitor C4, the diode Z2 and the capacitor C5 are used together to form a filter circuit; the filter circuit is used to stabilize the voltage state of the node Vsys during the charging process, and combined with the battery status detection terminal BAT, reflects the charging and discharging state of the battery module.

[0153] The diode D1 in the switch module is connected in parallel with the field effect transistor Q1; the Status_set port is connected to the gate of the field effect transistor Q1; a transistor QF2, inductors R8, R9 and R12 are arranged between the Status_set port and the gate of the field effect transistor Q1, the emitter of the transistor QF2 is grounded, the collector of the transistor QF2 is connected to the gate of the field effect transistor Q1, and the base of the transistor QF2 is electrically connected to the Status_set port. When the Status_set port outputs different signals, the signal is transmitted to the gate of the field effect transistor Q1 by utilizing the conduction effect of the transistor QF2 to control the conduction and cutoff states of the field effect transistor Q1.

[0154] The charging current also includes capacitor C6 and capacitor C7. Capacitor C6 and capacitor C7 are connected in parallel. The first ends of capacitor C6 and capacitor C7 are connected between the drain of field effect transistor Q1 and battery ports BAT+ and BAT-. The second ends of capacitor C6 and capacitor C7 are grounded. Capacitor C6 and capacitor C7 are used to store and release electrical energy for charging and discharging of the battery module.

[0155] Combined with Figures 1 to 4 The charging circuit 1 shown in the embodiment of the present disclosure has the following three main power supply scenarios when the electric tool is working; the first power supply scenario is the battery alone power supply scenario; the second power supply scenario is the adapter charging the battery module scenario; the third power supply scenario is the plug-in available scenario.

[0156] In the example of a battery-only power supply scenario, when the connection line of the USB port (Type-C Input+ and Type-C Input) of the electronic device is removed, that is, there is no power supply current input to the USB port, the MCU unit of the power tool outputs a high-level signal by configuring the Status_set port, thereby turning on the field effect transistor Q1, so that the second charging current output by the BAT port is directly connected to the System_power, thus skipping the diode D1 and reducing the voltage loss between the BAT port and the System_power), thereby maintaining the normal operation of the power tool more efficiently. At this time, since the charging IC has no power output, the power-consuming modules such as the MCU main control unit and the system load are powered by the battery module.

[0157] In the scenario where the adapter charges the battery module, when the connection line of the USB port (Type-C Input+ and Type-C Input-) of the electronic device is connected to the adapter of the external power supply, that is, the USB port has a power supply current input, if the power module is in a non-working state, the MCU unit outputs a low-level signal by configuring the Current_set port to cut off the transistor QF1. At this time, the variable impedance component is only R1, so that the charging IC can output a first charging current with a small current value, that is, the charging circuit is in a low-current charging mode, for example, the first charging current is 800mA at this time; at the same time, the MCU unit outputs a high-level signal by configuring the Status_set port, turns on the field effect transistor Q1, and allows the first charging current to enter the BAT port, so that the external power supply can supply power to the battery module separately; here, adjusting the charging circuit to be in a low-current charging mode can make the battery performance in the best working range, thereby improving the performance and safety of the battery.

[0158] In the plug-in available scenario, when the USB port (Type-C Input+ and Type-C Input-) has power supply current input and the power module is in working state, the MCU unit configures the Status_set port to output a low-level signal to cut off the field effect transistor Q1. Due to the unidirectional conduction performance of the diode D1, the battery module cannot be connected to the System_power port through the BAT port and the diode D1, and the charging IC cannot output the first charging current to the battery module through the connection node a; at the same time, the MCU unit configures the Current_set port to output a high-level signal to turn on the transistor QF1, and the variable impedance component is represented by R1 and R2 in parallel, so that the charging IC outputs a first charging current with a large current value, that is, the charging circuit is in a high-current charging mode.

[0159] In the high-current working mode, the charging of the power module includes the following two situations: Situation 1: When the load current of the power module is less than the first charging current that the adapter of the external power supply can provide, such as 3000mA, the power module is only powered by the external power supply; exemplarily, the load current required by the power module is 2900mA, then the adapter of the external power supply provides 2900mA, and the battery module provides 0mA. Situation 2: When the load current of the power module is greater than the first charging current that the adapter of the external power supply can provide, such as 3000mA, the power module is powered by both the adapter of the external power supply and the battery module, and the first charging current provided by the adapter of the external power supply is used first. Exemplarily, when the load current required by the power module is 3100mA, the adapter of the external power supply provides 3000mA, and the battery module provides 100mA. In this way, the power tool can be plugged in and used, and the power consumption of the battery module is reduced, thereby extending the battery life of the product.

[0160] Figure 7 The structure frame of the electric tool according to an exemplary embodiment is shown Figure 2 For example, the electric tool 700 may be an electric grinding pen, an electric screwdriver, an electric drill, an air pump, an electric wrench, an electric chain saw, an electric scissors, and the like.

[0161] Reference Figure 7 The power tool 700 may include one or more of the following components: a processing component 702 , a memory 704 , a power component 707 , a multimedia component 708 , an audio component 710 , an input / output (I / O) interface 712 , a sensor component 714 , and a communication component 716 .

[0162] The processing component 702 generally controls the overall operation of the power tool 700, such as operations associated with at least one of a display, a phone call, data communications, a camera operation, and a recording operation. The processing component 702 may include one or more processors 720 to execute instructions to complete all or part of the steps of the above-mentioned method. In addition, the processing component 702 may include one or more modules to facilitate the interaction between the processing component 702 and other components. For example, the processing component 702 may include a multimedia module to facilitate the interaction between the multimedia component 708 and the processing component 702, and the processing component includes the control module MCU unit proposed in the above-mentioned embodiment of the present disclosure.

[0163] The memory 704 is configured to store various types of data to support operations on the power tool 700. Examples of such data include at least one of the following: instructions for any application or method operating on the power tool 700, contact data, phone book data, messages, pictures, and videos. The memory 704 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0164] The power supply component 707 provides power to various components of the power tool 700. The power supply component 707 may include at least one of the following: a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the power tool 700, and the power supply component includes the battery module proposed in the above embodiment of the present disclosure.

[0165] The multimedia component 708 includes a screen that provides an output interface between the power tool 700 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation.

[0166] The audio component 710 is configured to output and / or input audio signals. For example, the audio component 710 includes a microphone (MIC), which is configured to receive external audio signals when the power tool 700 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 704 or sent via the communication component 716. In some embodiments, the audio component 710 also includes a speaker for outputting audio signals.

[0167] I / O interface 712 provides an interface between processing component 702 and peripheral interface modules, such as keyboards, click wheels, and buttons. These buttons include, but are not limited to, volume buttons, start buttons, and lock buttons.

[0168] The sensor assembly 714 includes one or more sensors for providing various aspects of status assessment for the power tool 700. For example, the sensor assembly 714 can detect the on / off state of the power tool 700, the relative positioning of the components, such as the display and keypad of the power tool 700, and the sensor assembly 714 can also detect the position change of the power tool 700 or a component in the power tool 700, the presence or absence of contact between the user and the power tool 700, the orientation or acceleration / deceleration of the power tool 700, and the temperature change of the power tool 700. The sensor assembly 714 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 714 may also include a light sensor, such as a complementary metal oxide semiconductor (CMOS) or a charge coupled device (CCD) image sensor, for use in imaging applications. In some embodiments, the sensor assembly 714 may also include, but is not limited to, at least one of the following: an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, and a temperature sensor.

[0169] The communication component 716 is configured to facilitate communication between the power tool 700 and other devices in a wired or wireless manner. The power tool 700 can access a wireless network based on a communication standard, such as Wi-Fi, 4G, 5G, or a combination thereof. In an exemplary embodiment, the communication component 716 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 716 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0170] In an exemplary embodiment, the power tool 700 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components.

[0171] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 704 including executable instructions or a computer program, which can be executed by a processor 720 of the power tool 700 to perform the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a compact disc read-only memory (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, etc.

[0172] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the use novelties disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0173] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A charging circuit, characterized in that: include: Power management module, power output port and battery module; The first input end of the power management module is connected to an external power source, and the output end of the power management module is connected to the power supply output port; The power supply output port is used to connect to the power consumption module; The battery module has a battery port, and the battery port is electrically connected to a connection node between the output end of the power management module and the power supply output port; Wherein, when the output end of the power management module outputs a first charging current and the power consumption module is in a non-working state, the first charging current flows from the connection node to the battery port; When the first charging current is output at the output end of the power management module and the power consumption module is in a working state, the first charging current flows from the connection node to the power supply output port.

2. The charging circuit according to claim 1, characterized in that: The charging circuit also includes a switch module; The switch module is electrically connected to a connection branch between the connection node and the battery port; Wherein, when the switch module is in the first switch state, the connection branch is turned on, and the first charging current flows from the connection node to the battery port; When the switch module is in the second switch state, the connection branch is disconnected, and the first charging current flows from the connection node to the power supply output port; When the switch module is in the third switch state, the connection branch is turned on, and the second charging current output by the battery module flows from the battery port to the connection node.

3. The charging circuit according to claim 2, characterized in that: The switch module includes a first switch component and a second switch component; The first switch component at least includes a diode, the anode of the diode is connected to the battery port, and the cathode of the diode is connected to the connection node; The second switch component is connected in parallel with the first switch component; Wherein, when the second switch component is in the on state and the diode is in the reverse biased state, the switch module is in the first switch state or the third switch state; When the second switch component is in an off state and the diode is in a reverse biased state, the switch module is in the second switch state; When the second switch component is in the disconnected state and the diode is in the forward biased state, the switch module is in the third switch state.

4. The charging circuit according to claim 3, characterized in that: The charging circuit also includes a control module; The control module has a first control port; The first control port is electrically connected to the second switch component, and the first control port is used to output the first charging current at the output end of the power management module, and output a first signal when the power consumption module is in a working state; The first control port is further used to output the first charging current at the output end of the power management module, and output a second signal when the power consumption module is in a non-working state; The first signal is used to put the second switch component in an off state; the second signal is used to put the second switch component in an on state.

5. The charging circuit according to claim 4, characterized in that: The second switch component includes a field effect transistor; The first control port is further configured to output a third signal when the output end of the power management module does not output the first charging current and the power consumption module is in a working state; The third signal is used to put the field effect tube into a conducting state.

6. The charging circuit according to any one of claims 1 to 5, characterized in that: The charging circuit also includes a charging management module, wherein the charging management module has a variable impedance component; The charging management module is electrically connected to the second input terminal of the power management module; Wherein, the impedance value of the variable impedance component is different, and the current value of the first charging current outputted from the output end of the power management module is different.

7. The charging circuit according to claim 6, characterized in that: The control module of the charging circuit includes a second control port; The second control port is electrically connected to the variable impedance component, and the second control port is used to output a control signal; wherein when the control signal output by the second control port is different, the impedance value of the variable impedance component is different.

8. The charging circuit according to claim 7, characterized in that: The variable impedance component includes a first impedance element, a second impedance element and a switch element; After the second impedance element and the switch element are connected in series, they are connected in parallel with the first impedance element; The switch element is electrically connected to the second control port; Wherein, when there is current input at the first input end of the power management module and the power module is in a non-working state, the control signal is a fourth signal; when there is current input at the first input end of the power management module and the power module is in a working state, the control signal is a fifth signal; The fourth signal is used to put the switch element in an off state, and the fifth signal is used to put the switch element in an on state.

9. The charging circuit according to claim 8, characterized in that: The switch element includes a transistor or a field effect transistor.

10. The charging circuit according to any one of claims 1 to 5, characterized in that: The charging circuit also includes an external power supply module; The input end of the external power supply module is electrically connected to the external power supply, and is used to obtain the power supply current of the external power supply; The first input end of the power management module is electrically connected to the output end of the external power supply module, and the power management module is used to obtain the first charging current based on the power supply current of the external power supply.

11. An electric tool, characterized in that: include: A power module, and a charging circuit as claimed in any one of claims 1 to 10; The power-consuming module is electrically connected to the power supply output port of the charging circuit, and the power-consuming module is used to at least obtain a first charging current output by the power supply output port.

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