CN213937459U - Power supply system for electric tool - Google Patents

Abstract

The present application relates to a power tool power supply system. The system comprises a power supply device, an electric tool and a cable, wherein the cable comprises a first end electrically connected with a second end, and the second end is provided with an adapter to adapt to different electric tools; the electric tool comprises a voltage matching detection circuit and a tool working circuit, wherein the voltage matching detection circuit detects the input voltage of the input interface, compares the detected input voltage value with the preset working voltage value of the electric tool, and determines whether to output a tool working signal to the tool working circuit or not. This electric tool power supply system, through the electric tool of the different operating voltage of a cable adaptation, and can detect whether input voltage matches with electric tool, avoided input voltage mistake and the electric tool that leads to damage when saving cable purchase cost.

Description

Power supply system for electric tool

Technical Field

The present application relates to the field of power tools, and more particularly to power tool power supply systems.

Background

Aiming at the existing hand-held electric tools, such as chains, pruners and the like, a detachable battery pack or a backpack type battery is adopted to supply power to the electric tools. However, different types of electric tools have the same or different rated operating voltages, and it is necessary to provide battery packs or backpack batteries having the same or different rated voltages, and if the output voltage of the battery pack is different from the rated voltage required for the tool, the battery pack needs to be replaced with a battery pack that matches the rated voltage of the tool.

Along with the technical development, a large-capacity power supply device capable of being carried by a user appears, a power supply module consisting of a plurality of groups of batteries is arranged inside the power supply device for supplying power, the power supply device is provided with a plurality of power output ports for outputting working voltages with different voltage values, for example, voltages of 20V, 40V, 60V and the like can be output, each power output port needs to be provided with an adaptive connecting wire for outputting voltage to an electric tool, and if the output voltage is 20V, a 20V cable needs to be correspondingly arranged, so that the power supply device is connected to the tool through the cable for supplying power to the tool. Compared with the traditional battery pack, the power supply device can output various working voltages, is simultaneously applied to electric tools with various different rated working voltages, and has strong universality. However, since the output voltage is variable, a corresponding adapter cable needs to be installed, which is costly and troublesome to operate, and when a user does not know the rated voltage of the power tool, if an output voltage incompatible with the power tool is selected on the power supply device, the input voltage of the tool may be wrong, causing damage to the tool or causing a safety problem.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the problem to be solved by the application is how to enable the power supply device with different output voltages to supply power for various electric tools through a cable, and meanwhile, the safe use of the tool can be ensured.

The technical scheme that this application solved prior art problem and adopted is:

a power supply system of an electric tool comprises a power supply device, the electric tool and a cable, wherein the electric tool comprises an input interface for receiving supply voltage and a main switch, the power supply device comprises a power supply interface for outputting voltage externally, the cable comprises a first end electrically connected with a second end, the second end is provided with an adapter to adapt to different electric tools, the first end is electrically connected with the power supply interface, and the second end is electrically connected with the input interface; the electric tool comprises a voltage matching detection circuit and a tool working circuit, wherein one end of the voltage matching detection circuit is electrically connected with the input interface, the other end of the voltage matching detection circuit is electrically connected with the tool working circuit, the voltage matching detection circuit detects the input voltage of the input interface, compares the detected input voltage value with the preset working voltage value of the electric tool, and determines whether to output a tool working signal to the tool working circuit or not.

Preferably, the power tool includes an alarm device electrically connected to the voltage matching detection circuit, the comparing the detected input voltage value with a preset operation voltage value of the power tool, and the determining whether to output a tool operation signal to the tool operation circuit by the voltage matching detection circuit includes: when the input voltage value is larger than or smaller than the preset working voltage value of the electric tool, the voltage matching detection circuit does not output a tool working signal to the tool working circuit, the voltage matching detection circuit outputs an alarm signal to the alarm device, and the alarm device gives an alarm.

Preferably, the voltage matching detection circuit includes a main switch and a switch control circuit, one end of the main switch is electrically connected to the input interface, the other end of the main switch is electrically connected to the switch control circuit, when the main switch is closed, an instruction indicating to start the electric tool is generated to the switch control circuit, and the switch control circuit outputs a main switch closing signal according to the instruction.

Preferably, the voltage matching detection circuit includes a second switch and a first voltage conversion module, the second switch is electrically connected to the switch control circuit and the first voltage conversion module and is electrically connected to the input interface, when the second switch receives a main switch closing signal output by the switch control circuit, the second switch is turned on, and the first voltage conversion module converts the input voltage output by the second switch into a controller operating voltage.

Preferably, the voltage matching detection circuit includes a controller and a voltage detector, the controller is electrically connected to the first voltage conversion module and the switch control circuit and electrically connected to the voltage detector, and the voltage detector is controlled to detect the input voltage of the input interface according to a received main switch closing signal output by the switch control circuit and the controller operating voltage.

Preferably, the comparing the detected input voltage value with a preset operation voltage value of the power tool, and the voltage matching detection circuit determining whether to output a tool operation signal to the tool operation circuit includes: the voltage detector is electrically connected with the input interface and the controller, the voltage detector detects the input voltage of the input interface, and when the voltage value of the input voltage received by the controller is greater than or less than the preset working voltage value, the controller does not output a tool working signal.

Preferably, the tool operating circuit includes a first switch and a motor, the first switch is electrically connected to the controller and the motor and electrically connected to the input interface, the comparing the detected input voltage value with a preset operating voltage value of the power tool, and the voltage matching detecting circuit determines whether to output a tool operating signal to the tool operating circuit, and then includes: when the voltage value of the input voltage received by the controller meets the preset working voltage value, the controller outputs a tool working signal to the first switch, and the first switch is switched on.

Preferably, the voltage matching detection circuit includes a second voltage conversion module electrically connected to the input interface and the controller, the comparing the detected input voltage value with a preset operating voltage value of the power tool, and the determining whether to output a tool operating signal to the tool operating circuit includes: the voltage value of the input voltage is greater than or less than the preset working voltage value, the controller outputs a tool working signal to the second voltage conversion module, and the second voltage conversion module converts the received input voltage into the preset working voltage.

Preferably, the tool operating circuit includes a third switch and a motor, the third switch electrically connects the second voltage conversion module and the motor, and the third switch is turned on when the third switch receives the tool operating signal.

The power supply system of the electric tool comprises the cable, the cable can be matched with power supplies of different output voltages at the same time, the power supply system is suitable for electric tools of different working voltages, when the tool is connected with the power supply device, the electric tools determine whether the tool is started according to the detected input voltage value, the cable purchase cost is saved, meanwhile, the damage of the electric tools caused by input voltage errors is avoided, and the safe use of the tools by users is guaranteed.

Drawings

FIG. 1 is a schematic view of one embodiment of a power tool power supply system of the present application;

FIG. 2 is a functional block diagram of one embodiment of the power tool of the present application;

FIG. 3 is a functional block diagram of another embodiment of a power tool of the present application;

FIG. 4 is a circuit diagram of one embodiment of the power tool of the present application;

fig. 5 is a circuit diagram of another embodiment of the power tool of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like 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 application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means at least two. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Fig. 1 is a schematic diagram illustrating one embodiment of a power tool power supply system 10 according to the present application. The power tool power supply system 10 includes: a power supply device 100, a power tool 300, and a cable 200 electrically connected between the power supply device 100 and the power tool 300. The cable 200 accommodates power tools 300 of different voltage ratings.

Specifically, as shown in fig. 1, the power supply device 100 includes a housing 101, a power module 102, a power interface 104 electrically connected to the power module 102, a voltage switching circuit 105, and a voltage converting switch 106. Wherein, the power module 102 is located in the housing and comprises a plurality of batteries electrically connected, the batteries are connected in series and/or in parallel, and the output power of the power module 102 is connected to the power supply interface 104; the power supply interface 104 is arranged on the shell, and the cable 200 is arranged on the power supply interface 104 to obtain the power of the power supply module 102 and supply power to the electric tool 300; the voltage switching circuit 105 is located between the power supply module 102 and the power supply interface 104 and is connected to a user-operated voltage switch 106 located on the housing, and the user operates the voltage switch 106 to control the voltage switching circuit 105 to adjust the output voltage of the power supply interface 104. For example, the voltage switch 106 is a multi-stage knob switch with three stages of 20V, 40V and 60V, and the voltage switching circuit 105 is a series-parallel switching circuit, which can change the series-parallel relationship of the power module 102, so that the voltage of the output power of the power module 102 is switched among 20V, 40V and 60V. When the user rotates the voltage switch 106 to select 20V, the trigger voltage switching circuit 105 changes the series-parallel connection relationship, and the power supply module 102 outputs 20V power, so that the power supply interface 104 obtains 20V voltage and transmits the power to the external cable 200. The power supply interface 104 is made of conductive metal and electrically connected to the power module 102 for outputting the electric energy of the power module 102. It will be understood by those skilled in the art that the voltage switching circuit 105 may also be an output-adjustable DC/DC module, which can adjust the output voltage according to the voltage converting switch 106, or other embodiments.

The cable 200 includes a first end 202 and a second end 204 electrically connected to the first end 202. The first end 202 of the cable 200 is electrically connected to the power supply interface 104 of the power source 102, and the second end 204 is electrically connected to the power input port of the power tool 300, so that when power is supplied, a current loop is formed in the power supply device 100, the cable 200 and the power tool 300. The power input port of the power tool for obtaining the input voltage is a cable port, and the second end 204 of the corresponding cable 200 is a common cable port which can be commonly installed on the cable ports of a plurality of power tools with different rated working voltages for supplying power. When the power input port of the power tool is in other forms, such as a slide rail mounting port for mounting a battery pack, the second end 204 of the corresponding cable 200 may be provided with an adapter, and the adapter may be adapted to the power tools 300 with different rated operating voltages, so that the cable 200 may be electrically connected to different power tools 300.

When the power supply system 10 of the power tool is in operation, the cable 200 is electrically connected between the power supply device 100 and the power tool 300. At this time, the output voltage of the power supply device 100 is adjusted by the voltage conversion switch 106 operated by the user, so that the input voltage of the power tool 300 is adapted to the rated voltage of the power tool 300, the power tool 300 is electrically connected to the second end 204 of the cable 200, and the power supply voltage output by the power supply device 100 is received by the cable 200 and transmitted to the power tool 300.

When the electric tool 300 is electrically connected to the power supply device, the user presses the main switch of the electric tool 300, and the electric tool 300 does not necessarily start the motor to start operating. The voltage matching detection circuit 400 of the power tool further detects the input voltage of the input interface 302, compares the detected input voltage value with a preset working voltage value of the power tool 300, and determines whether to output a tool working signal to the tool working circuit 500 by the voltage matching detection circuit 400, wherein the output tool working signal is used for controlling the working state of the power tool 300. Therefore, even if the user selects an output voltage of the power supply device that does not match the electric power tool, the electric power tool does not directly input the wrong voltage to the motor of the electric power tool when receiving the output voltage, and the motor is not damaged.

In the illustrated embodiment, the power tool power supply system 10 can apply power supplies having different output voltages to a plurality of power tools 300 having different rated operating voltages through only one common cable 200. Meanwhile, the power supply device 100 is further provided with a voltage conversion switch 106 operated by a user, so that the output voltage of the power supply device 100 is controlled, and accidents caused by mismatching of the input voltage of the electric tool 300 and the rated voltage of the electric tool 300 when the same power supply device 100 and the cable 200 are adapted to various electric tools 300 with different rated working voltages are avoided. Not only saves the use cost of the cable 200, but also avoids the damage of the electric tool 300 caused by the error input voltage, and ensures the safe use of the tool by users.

Fig. 2 is a schematic block diagram of an embodiment of a power tool 300 of the present application. The power tool 300 includes a voltage match detection circuit 400 and a tool operating circuit 500.

The power tool 300 includes an input interface 302 (the power input port), a voltage matching detection circuit 400 electrically connected to the input interface 302, and a tool operating circuit 500 connected to the voltage matching detection circuit 400 to obtain power. The voltage match detection circuit 400 receives power from the input interface 302 and has a power output that is delivered to the tool operating circuit 500 via the power supply lines. The tool operating circuit 500 includes the circuitry necessary for the tool, such as the user operated main switch 312, the controller 304, and the motor 306, and when the tool operating circuit 500 receives power from the power line and the user presses the main switch to activate the tool, the controller 304 is powered and controls the operation of the motor 306. The input interface 302 is a conductive metal, and is electrically connected to and physically connected to the second end 204 of the cable 200. The power supply lead of the motor 306 is connected to the power supply line through a discharge switch, and the controller 304 sends out a control signal to control the on-off of the discharge switch when working, so that the discharge switch is disconnected, the motor is disconnected from the power line, and the motor is stopped. I.e., the motor 306 operates or stops operating in response to control signals from the controller 304.

The voltage matching detection circuit 400 is configured to detect an input voltage of the input interface 302, and control on/off of a circuit between the input interface 302 and the tool working circuit 500. In the illustrated embodiment, the line between the tool working circuit 500 and the input interface 302 is electrically connected, and the voltage matching detection circuit 400 is disposed on the line, so that the voltage matching detection circuit 400 can control the on/off of the line between the tool working circuit 500 and the input interface 302. At this time, a preset working voltage value may be set in the voltage matching detection circuit 400, where the voltage is a working voltage or a rated voltage of the electric tool 300, and the voltage is a fixed value or within a certain value range, for example: 20V and 19V-22V. When the voltage matching detection circuit 400 detects that the input voltage value of the input interface 302 meets the preset working voltage value, the voltage matching detection circuit 400 controls the circuit between the input interface 302 and the tool working circuit 500 to be conducted, that is, the voltage matching detection circuit 400 normally outputs electric power to the power supply line; otherwise, when the input voltage of the input interface 302 exceeds the preset working voltage value, the voltage matching detection circuit 400 controls the circuit between the input interface 302 and the tool working circuit 500 to be disconnected, the voltage matching detection circuit 400 stops outputting the electric power to the power supply line, and the tool working circuit 500 is powered off and does not work.

In this embodiment, the preset operating voltage value of the voltage matching detection circuit 400 may be set to the rated preset operating voltage value of the power tool 300. At this time, when the input voltage of the power tool 300 is within the preset operation voltage value of the power tool 300, the power tool 300 may be electrically operated. Otherwise, the power tool 300 cannot be powered on. This voltage matching detection circuit 400's setting can further avoid the electric tool 300 use in input voltage and the rated voltage mismatch the safety risk that brings, avoid not adapting with the rated voltage of electric tool 300 because of power supply unit 100's output voltage, lead to electric tool to receive higher voltage and damage or lower voltage and unable actual start to promote the security of electric tool 300, promote user experience effect.

Fig. 3 is a schematic block diagram of another embodiment of a power tool 300 according to the present application. The power tool 300 includes a voltage match detection circuit 400 and a tool operating circuit 500. In the illustrated embodiment, the power tool 300 may further include an alarm device 311. The alarm device 311 is connected to and controlled by the voltage matching detection circuit 400. At this time, when the voltage matching detection circuit 400 detects that the input voltage of the input interface 302 exceeds the preset operating voltage value, the alarm device 311 may be controlled to operate to issue an alarm. The alarm device 311 may be an electro-acoustic or electro-luminescent device such as a buzzer or an indicator light to provide an alarm.

Fig. 4 is a circuit diagram illustrating an embodiment of a power tool 300 of the present application. The power tool 300 includes a voltage matching detection circuit 400, the voltage matching detection circuit 400 includes a main switch 312 and a switch control circuit 314, one end of the main switch 312 is electrically connected to the input interface 302, and the other end is electrically connected to the switch control circuit 314. When a user presses a main switch on the electric tool, the main switch 312 is closed, an instruction indicating to start the electric tool 300 is generated to the switch control circuit 314, the switch control circuit 314 is turned on, and a main switch closing signal is output according to the instruction, and the switch closing signal is used for indicating the closing state of the main switch. The switch control circuit is arranged behind the main switch, so that the switching state of the main switch can be detected, the switching state of the main switch can be transmitted to other circuit modules simultaneously, and the on-off of other modules can be adjusted.

In the illustrated embodiment, the voltage matching detection circuit 400 further includes a second switch 318 and a first voltage conversion module 308, and the second switch 318 is electrically connected to the switch control circuit 314 and the first voltage conversion module 308 and is electrically connected to the input interface 302. When the main switch is turned off, the second switch 31 receives the main switch turn-off signal output by the switch control circuit 314, the second switch 318 is turned on, and the first voltage conversion module 308 converts the input voltage output through the second switch 318 into the controller operating voltage. When the user presses the main switch of the tool, the motor of the tool is not directly connected to the power supply to start, but the second switch 318 is turned on, and the power supply voltage of the power supply device input from the input port 302 is converted into the rated voltage of the controller through the first voltage conversion module 308, so as to provide the proper working voltage for the controller. For example, the operating voltage of the controller 304 is 5V, i.e., the controller 304 can operate under the driving of 5V. At this time, the first voltage conversion module 308 is used for converting the input voltage of the input interface 302 to 5V and feeding the power to the controller 304, so that the controller 304 enters the operating state. Conversely, when the second switch 318 is turned off, the first voltage conversion module 308 does not operate, and the controller 304 is not powered on.

In the illustrated embodiment, the voltage matching detection circuit 400 further includes a controller 304 and a voltage detector 310, wherein the controller 304 is electrically connected to the first voltage conversion module 308 and the switch control circuit 314, and is electrically connected to the voltage detector 310. When the main switch 312 is closed, the controller 304 receives the main switch closing signal output by the switch control circuit 314, and in addition, the controller 304 also receives the controller operating voltage converted and output by the first voltage conversion module 308, at this time, the controller 304 starts up, outputs a voltage detection signal to the voltage detector 310, and controls the voltage detector 310 to detect the input voltage of the input interface 302. Under the control of the controller, the voltage detector starts a detection function, detects the voltage value of the input interface 302, transmits the detected value of the input voltage to the controller 304, and the controller 304 acquires the detected value of the input voltage, compares the detected value of the input voltage with a preset tool working voltage value, and controls the motor 306 to work.

Preferably, to facilitate control of the power supply system 10 of the power tool, the main switch 312 is electrically connected between the switch control circuit 314 and the input interface 302, when a user operates the main switch 312 to change from off to on, the switch control circuit 314 detects a level change from the input interface, at this time, the switch control circuit 314 is instantaneously turned on, the switch control circuit 314 controls the second switch 318 to be instantaneously turned on, the first voltage conversion module operates, the controller is electrically operated, the controller 304 outputs a locking signal to the switch control circuit 314, and the switch control circuit 304 and the second switch 318 are locked in an on state.

In the illustrated embodiment, the alarm device 311 is connected to the controller 304, and is controlled by the controller 304, and the controller 304 determines whether to output an alarm signal to the alarm device 311 according to whether the detected value of the input voltage and a preset tool operating voltage value match, i.e., whether the input voltage value is within a range of the tool operating voltage value or equal to the operating voltage value, obtained by the controller 304. If the signals are matched, the alarm device 311 is not started, and if the signals are not matched, the alarm device 311 is controlled to work to send out an alarm. The alarm device 311 may be an electro-acoustic or electro-luminescent device such as a buzzer or an indicator light to provide an alarm.

In the illustrated embodiment, the comparing the detected input voltage value with the preset operation voltage value of the power tool 300, the voltage matching detection circuit 400 determining whether to output the tool operation signal to the tool operation circuit 500 includes: the voltage detector is electrically connected to the input interface 302 and the controller 304, the voltage detector 310 detects an input voltage of the input interface 302, and when a voltage value of the input voltage received by the controller 304 is greater than or less than the preset working voltage value, the controller 304 does not output a tool working signal. The voltage value of the input voltage being greater than or less than the preset operation voltage value means that the input voltage value of the input interface 302 is not an operation voltage suitable for the operation of the electric tool 300, and therefore the controller 304 does not output a tool operation signal to the operation circuit 500, and the operation circuit 500 does not operate. That is, when the user closes the main switch and wants to start the operation of the power tool, the voltage matching detection circuit 400 first detects an input voltage, the detected input voltage does not fall within the rated voltage range of the power tool 300, and the operation circuit 500 is controlled by the voltage matching detection circuit 400, does not receive the tool operation signal from the controller 304, and still does not start the operation of the tool.

In the illustrated embodiment, the tool operation circuit 500 includes a first switch 316 and a motor 306, the first switch 316 is electrically connected to the controller 304 and the motor 306 and electrically connected to the input interface 302, the detected input voltage value is compared with a preset operation voltage value of the power tool 300, and the voltage matching detection circuit 400 determines whether to output a tool operation signal to the tool operation circuit 500. Preferably, when the voltage value of the input voltage received by the controller 304 satisfies the preset operating voltage value, the controller 304 outputs a tool operating signal to the first switch 316, the first switch 316 is turned on, and the input voltage of the input interface 302 is input to the motor 306 through the first switch 316, so that the motor 306 rotates.

When the controller 304 is in an operating state, the operation of the motor 306 is controlled according to the detection value of the input voltage by the voltage detector 310. The voltage detector 310 detects an input voltage of the input interface 302, and transmits the detected value to the controller 304. The controller 304 may have a preset operating voltage value set therein, which may correspond to a rated voltage at which the motor 306 operates. When the controller 304 acquires a detected value of the input voltage of the input interface 302, the detected value is compared with a preset operating voltage value. When the detected value of the input voltage is within the preset working voltage value, the circuit where the motor 306 is located may be controlled to be turned on, that is, the first switch 316 is turned on, so that the motor 306 is powered on to work. Conversely, when the value of the input voltage exceeds the preset operating voltage value, the circuit in which the motor 306 is located may be controlled to be turned off, that is, the first switch 316 is turned off.

The voltage match detection circuit 400 of the power tool power supply system 10 includes a voltage detector 310, the voltage detector 310 being controlled by the controller 304 for detecting an input voltage value of the input interface 302. The voltage detector 310 detects the magnitude of the input voltage of the power supply apparatus 100 in real time, and the controller 304 controls the motor 306 to operate according to the magnitude of the input voltage. The voltage detector 310 can avoid the possibility that the input voltage is not matched with the rated voltage in the use process of the electric tool 300, and avoid the damage to the electric tool caused by the mismatching of the input voltage and the working voltage of the electric tool, thereby improving the safety of the electric tool 300 and improving the user experience effect.

Fig. 5 is a circuit diagram showing another embodiment of the power tool 300 of the present application. Unlike the embodiment shown in fig. 4, the voltage matching detection circuit 400 includes a second voltage conversion module 320, and the second voltage conversion module 320 electrically connects the input interface 302 and the controller 304. When the voltage value of the input voltage received by the controller 304 is greater than or less than the preset working voltage value, the controller 304 still outputs a tool working signal. That is, when it is detected that the input voltage of the input interface 302 does not match the preset operating voltage of the power tool 300, the power tool does not have to be in two states, i.e., the alarm device 311 is not activated or activated, the output tool operating signal is transmitted to the second voltage conversion module 320, and the second voltage conversion module 320 can convert the received input voltage into an operating voltage suitable for the operation of the power tool 300. For example: the input voltage provided by the power supply device 100 and received by the input interface 302 is 30V, the pre-stored operating voltage of the power tool 300 by the controller is 20V, when the voltage matching detection circuit 400 includes the second voltage conversion module 320, the controller 304 outputs a tool operating signal to the second voltage conversion module 320, and the second voltage conversion module 320 reduces the input voltage of 30V to 20V. Therefore, the power supply system 10 of the power tool of the present embodiment further has a function of adjusting the input voltage, so that the power tool can be protected, and the power tool can still work normally even if the input voltage is not matched with the working voltage of the power tool.

In the illustrated embodiment, the tool operation circuit 500 includes a third switch 322 and a motor 306, the third switch 322 electrically connects the second voltage conversion module and the motor 306, when the third switch 322 receives the tool operation signal, the third switch 322 is turned on, the tool operation voltage is input to the motor 306 through the third switch 322, and the motor 306 starts to operate.

Preferably, the second voltage conversion module 320 is used for converting the input voltage of the input interface 302 to the rated voltage of the motor 306. Specifically, when the power supply device 100 supplies power to the input interface 302 of the power tool 300, the voltage detector 310 detects the magnitude of the input voltage and transmits the detected value to the controller 304. At this time, the input interface 302 has two power supply lines to supply power to the motor, the first power supply line is directly connected to the motor through the first switch 316 by the input interface 302, and the second power supply line is connected to the third switch 322 by the second voltage conversion module 320 and then connected to the motor. The controller 304 compares the detected value with a preset working voltage value, and if the detected value is within the preset working voltage value of the controller 304, the controller 304 controls the first switch 316 to be closed, and the third switch 322 is switched off, so that the motor 306 can work. If the detected value exceeds the operating voltage, the controller 304 controls the second voltage conversion module 320 to operate. The second voltage conversion module 320 converts the input voltage to a rated operating voltage of the power tool 300. At this time, the third switch 322 is controlled to be turned on, and the first switch 316 is controlled to be turned off, so that the second voltage conversion module 320 supplies power to the motor 306 through the third switch 322, and the motor 306 can work.

In the power supply system 10 for power tool, when the input voltage of the power tool 300 is not equal to the rated voltage of the power tool 300, the second voltage conversion module 320 can convert the input voltage into the rated voltage or into the working voltage range of the power tool.

In one embodiment, referring to fig. 1 and 3, the power supply system 10 of the present application includes a power supply device 100, a cable 200, and a power tool 300.

The power supply device 100 includes a power module 102, and the power module 102 is composed of four identical 20 vdc batteries. The power supply interface 104 is electrically connected to the power module 102 to output power. The voltage switching circuit 105 is disposed between the power supply interface 104 and the power supply 102, and a user operates the voltage converting switch 106 to control the voltage switching circuit 105, so as to change the output voltage of the power supply apparatus 100 by changing the connection manner of the four dc batteries. For example, when the power supply device 100 needs to output a voltage of 20V, a plurality of 20 vdc batteries may be connected in parallel by the voltage switching circuit 105; when the power supply apparatus 100 needs to output a voltage of 80V, four 20 vdc batteries may be connected in series by the voltage switching circuit 105.

The first end 202 of the cable 200 is electrically connected to the output interface of the power supply apparatus 100. The second end 204 of the cable 200 is used for electrically connecting with the power tool 300, so as to conduct between the power supply device 100 and the power tool 300. In order to adapt the power supply device 100 and the cable 200 to different power tools 300, the second end 204 of the cable 200 may be provided with an adapter. The adapter is adapted to the input interface 302 of different power tools 300. The power tool includes at least a first tool and a second tool having different rated operating voltages. The cable is connectable to the first tool and the second tool and outputs a corresponding nominal operating voltage.

The electric tool 300 comprises an input interface 302, a voltage matching detection circuit 400 and a tool working circuit 500 which are connected in series; an alarm device 311 is also included that is connected to the voltage match detection circuit 400. The voltage matching detection circuit 400 is provided therein with a working voltage, and the working voltage is equal to the rated working voltage range of the electric tool 300.

When the power supply system 10 of the power tool is in operation, the output voltage of the power supply device 100 is adjusted by the voltage switch 106, and the power supply device 100 and the power tool 300 are connected by the cable 200. The voltage matching detection circuit 400 is used for detecting the input voltage of the input interface 302, and when the input voltage value of the input interface 302 meets the working voltage, the voltage matching detection circuit 400 controls the circuit between the input interface 302 and the tool working circuit 500 to be conducted, so that the motor 306 is electrified to work.

If the user forgets to adjust the output voltage of the power supply device 100, so that the input voltage of the electric tool 300 does not satisfy the rated operating voltage range, at this time, the input voltage value of the input interface 302 does not satisfy the operating voltage, and the voltage matching detection circuit 400310 controls the circuit between the tool operating circuit 500 and the input interface 302 to be disconnected, and controls the circuit where the alarm device 311 is located to be connected. At this time, the alarm device 311 operates.

In another embodiment, referring to fig. 1 and 5, the power supply system 10 of the present application includes a power supply device 100, a cable module 200, and a power tool 300.

The power supply device 100 includes a power module 102, and the power module 102 is composed of four identical 20V dc batteries. The power supply interface 104 is electrically connected to the power module 102 to output power. The voltage switching circuit 105 is disposed between the power supply interface 104 and the power supply 102, and a user operates the voltage switch 106 to control the voltage switching circuit 105, so as to change the output voltage of the power supply apparatus 100 by changing the connection mode of the four dc batteries. For example, when the power supply device 100 needs to output a voltage of 20V, a plurality of 20 vdc batteries may be connected in parallel by the voltage switching circuit 105; when the power supply apparatus 100 needs to output a voltage of 80V, four 20 vdc batteries may be connected in series by the voltage switching circuit 105.

The first end 202 of the cable 200 is electrically connected to the output connector of the power supply device 100. The second end 204 of the cable 200 is used for electrically connecting with the power tool 300, so as to conduct between the power supply device 100 and the power tool 300. In order to adapt the power supply device 100 and the cable 200 to different power tools 300, the second end 204 of the cable 200 may be provided with an adapter. The adapter is adapted to the input interface 302 of different power tools 300. The power tool includes at least a first tool and a second tool having different rated operating voltages. The cable is connectable to the first tool and the second tool and outputs a corresponding nominal operating voltage.

The power tool 300 includes an input interface 302, a voltage detector 310, a controller 304, a first switch 316, and a motor 306; further comprising a first voltage conversion module 308, a second switch 318, a switch control circuit 314, and a main switch 312; and a second voltage conversion module 320 and a third switch 322. The controller 304 is provided therein with a working voltage, and the working voltage is equal to the rated working voltage range of the electric tool 300.

The connection mode of each device in the electric tool 300 is as follows: the input interface 302, the voltage detector 310 and the controller 304 form a loop for detecting the magnitude of the input voltage and transmitting the detected value to the controller 304. The input interface 302, the second switch 318, the first voltage conversion module 308, and the controller 304 form a second loop for providing operating power to the controller 304. The input interface 302, the main switch 312, the switch control circuit 314, and the controller 304 form a third loop for controlling the second loop to completely power down the power tool 300 when the main switch 312 is turned off. The first switch 316 of the input interface 302 and the motor 306 form a fourth loop, and the first switch 316 is controlled by the controller 304 and is used for electrifying the motor 306 to work when the input voltage meets the working voltage. The input interface 302, the second voltage conversion module 320, the third switch 322 and the motor 306 form a fifth loop, and the second voltage conversion module 320 and the third switch 322 are controlled by the controller 304, and the loop is used for converting the voltage through the second voltage conversion module 320 and electrifying the motor 306 to work when the input voltage does not accord with the working voltage.

When the power supply system 10 of the power tool is in operation, the output voltage of the power supply device 100 is adjusted by the voltage switch 106, and the power supply device 100 and the power tool 300 are connected by the cable 200. At this time, the input interface 302 of the power tool 300 has a voltage. Pressing the main switch 312 energizes the switch control circuit 314, which controls the second switch 318 to close. The first voltage conversion module 308 converts the voltage into an operating voltage of the controller 304, such as 5V, and supplies power to the controller 304 to operate the controller 304. The voltage detector 310 is used for detecting the input voltage of the input interface 302 and transmitting the detected value to the controller 304. The controller 304 compares the detected value of the input voltage with a preset operating voltage in the controller 304.

When the input voltage value of the input interface 302 satisfies the operating voltage, the voltage detector 310 controls the first switch 316 to close. At this time, a fourth circuit formed by the input interface 302, the first switch 316, and the motor 306 is closed, and the motor 306 is powered on.

If the user forgets to adjust the output voltage of the power supply device 100, so that the input voltage of the electric tool 300 does not satisfy the rated operating voltage range, at this time, the controller 304 controls the second voltage conversion module 320 to operate and controls the third switch 322 to be closed. At this time, a fifth loop formed by the input interface 302, the second voltage conversion module 320, the third switch 322 and the motor 306 is closed, and the motor 306 is powered on to operate.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. A power supply system for a power tool, the system comprising a power supply device (100), a power tool (300) and a cable (200), the power tool (300) comprising an input interface (302) for receiving a supply voltage and a main switch (312), the power supply device (100) comprising a power supply interface (104) for outputting a voltage to the outside,

the cable (200) comprises a first end (202) electrically connected with a second end (204), the second end is provided with an adapter to adapt to different electric tools, the first end (202) is electrically connected with the power supply interface (104), and the second end (204) is electrically connected with the input interface (302);

the electric tool (300) comprises a voltage matching detection circuit (400) and a tool working circuit (500), one end of the voltage matching detection circuit (400) is electrically connected with the input interface (302), the other end of the voltage matching detection circuit is electrically connected with the tool working circuit (500), the voltage matching detection circuit (400) detects the input voltage of the input interface (302), compares the detected input voltage value with the preset working voltage value of the electric tool (300), and the voltage matching detection circuit (400) determines whether to output a tool working signal to the tool working circuit (500).

2. The power tool supply system according to claim 1, wherein the power tool includes an alarm device (311), the alarm device (311) being electrically connected to the voltage match detection circuit (400), the comparing the detected input voltage value with a preset operating voltage value of the power tool (300), the voltage match detection circuit (400) determining whether to output a tool operation signal to the tool operation circuit (500) including: when the input voltage value is larger than or smaller than the preset working voltage value of the electric tool (300), the voltage matching detection circuit (400) does not output a tool working signal to the tool working circuit (500), the voltage matching detection circuit (400) outputs an alarm signal to the alarm device (311), and the alarm device (311) gives an alarm.

3. The power tool power supply system according to claim 1, wherein the voltage matching detection circuit (400) includes a main switch (312) and a switch control circuit (314), the main switch (312) is electrically connected to the input interface (302) at one end and electrically connected to the switch control circuit (314) at the other end, and when the main switch (312) is closed, a command instructing to start the power tool (300) is generated to the switch control circuit (314), and the switch control circuit (314) outputs a main switch closing signal according to the command.

4. The power supply system for electric tools according to claim 3, wherein the voltage matching detection circuit (400) comprises a second switch (318) and a first voltage conversion module (308), the second switch (318) is electrically connected with the switch control circuit (314) and the first voltage conversion module (308) and is electrically connected with the input interface (302), the second switch (318) turns on the second switch (318) when receiving a main switch closing signal output by the switch control circuit (314), and the first voltage conversion module (308) converts the input voltage output by the second switch (318) into a controller working voltage.

5. The power tool supply system of claim 4, wherein the voltage match detection circuit (400) comprises a controller (304) and a voltage detector (310), the controller (304) is electrically connected with the first voltage conversion module (308) and the switch control circuit (314) and electrically connected with the voltage detector (310), and the voltage detector (310) is controlled to detect the input voltage of the input interface (302) according to the received main switch closing signal output by the switch control circuit (314) and the controller operating voltage.

6. The power tool supply system according to claim 5, wherein the comparing the detected input voltage value with a preset operating voltage value of the power tool (300), and the voltage match detection circuit (400) determining whether to output a tool operating signal to the tool operating circuit (500) comprises: the voltage detector is electrically connected with the input interface (302) and the controller (304), the voltage detector (310) detects the input voltage of the input interface (302), and when the voltage value of the input voltage received by the controller (304) is greater than or less than the preset working voltage value, the controller (304) does not output a tool working signal.

7. The power tool supply system of claim 5, wherein the tool operating circuit (500) includes a first switch (316) and a motor (306), the first switch (316) being electrically coupled to the controller (304) and the motor (306) and electrically coupled to the input interface (302), the voltage match detection circuit (400) determining whether to output a tool operating signal to the tool operating circuit (500) comprising: when the voltage value of the input voltage received by the controller (304) meets the preset working voltage value, the controller (304) outputs a tool working signal to the first switch (316), and the first switch (316) is turned on.

8. The power tool supply system of claim 6, wherein the voltage match detection circuit (400) includes a second voltage conversion module (320), the second voltage conversion module (320) electrically connecting the input interface (302) and the controller (304), the comparing the detected input voltage value to a preset operating voltage value of the power tool (300), the voltage match detection circuit (400) determining whether to output a tool operating signal to the tool operating circuit (500) including: the voltage value of the input voltage is greater than or less than the preset working voltage value, the controller (304) outputs a tool working signal to the second voltage conversion module, and the second voltage conversion module (320) converts the received input voltage into a tool working voltage.

9. The power tool power supply system of claim 8, wherein the tool operational circuitry (500) includes a third switch (322) and a motor (306), the third switch (322) electrically connecting the second voltage conversion module and the motor (306), the third switch (322) being conductive when the third switch (322) receives the tool operational signal.

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