CN111745598A - Electric tool, battery pack and electric tool combination - Google Patents
Electric tool, battery pack and electric tool combination Download PDFInfo
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- CN111745598A CN111745598A CN201910245095.6A CN201910245095A CN111745598A CN 111745598 A CN111745598 A CN 111745598A CN 201910245095 A CN201910245095 A CN 201910245095A CN 111745598 A CN111745598 A CN 111745598A
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- energy storage
- electrically connected
- tool
- storage element
- battery pack
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses an electric tool, which is powered by a battery pack, wherein the battery pack is detachably arranged on the electric tool, and the electric tool comprises: the tool comprises a tool positive terminal, a tool negative terminal, a functional piece, a motor driving circuit, an energy storage element and a time delay control circuit; the delay control circuit is electrically connected with the energy storage element and used for connecting the conducting path of the energy storage element within a preset time. The invention also discloses a combination comprising the battery pack and the electric tool. The electric tool can greatly reduce electric sparks generated at the connecting terminal of the electric tool and the battery pack at the initial stage of mounting the battery pack to the electric tool.
Description
Technical Field
The invention relates to an electric tool, a battery pack and an electric tool combination, in particular to an electric tool, a battery pack and an electric tool combination capable of avoiding electric sparks.
Background
Generally, a motor control system of an electric tool includes a capacitor having a large capacity, and when a battery pack is mounted to the electric tool and a voltage at a terminal of the capacitor is low, the battery pack charges the capacitor, and a large current is generated at a charging instant, which causes an electric spark between a connection terminal of the electric tool and a connection terminal of the battery pack. Similarly, if a main switch of the power supply is arranged in the tool, and the capacitor is connected behind the main switch of the power supply, when the main switch of the power supply is closed, the same problems exist, and the contact of the main switch of the power supply is also greatly damaged.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide an electric tool which uses a battery pack for supplying power and can greatly reduce electric sparks generated at a connecting terminal when the battery pack is installed on the electric tool. The invention also provides a battery pack and an electric tool combination which can greatly reduce electric sparks generated at the connecting terminal when the battery pack is installed on the electric tool.
In order to achieve the above object, the present invention adopts the following technical solutions:
a power tool powered using a battery pack removably mounted to the power tool, the power tool comprising: the tool positive terminal is used for connecting the positive power supply terminal of the battery pack; a tool negative terminal for connection to a negative power terminal of the battery pack; a function member for realizing a function of the electric tool; the motor is operably connected with the functional part to drive the functional part to work; the motor driving circuit is electrically connected with the motor and used for driving the motor to output power; an energy storage element connected in parallel with the motor drive circuit; and the delay control circuit is electrically connected with the energy storage element and is used for connecting the conductive path of the energy storage element within a preset time.
Optionally, the delay control circuit includes: the switching element is electrically connected with the energy storage element and is used for switching on or switching off the conductive path of the energy storage element; the energy storage circuit is electrically connected with the switching element and is used for controlling the switching element to be conducted within preset time; the switching element is connected in series between the energy storage circuit and the energy storage element.
Optionally, the switching element comprises: a first switch end electrically connected to the tool negative terminal; the second switch end is electrically connected with the low-voltage end of the energy storage element and is electrically connected with the motor driving circuit;
optionally, the switching element comprises: the first switch end is electrically connected with the low-voltage end of the energy storage element; the second switch end is electrically connected with the negative terminal of the tool and the motor driving circuit; and the control end is electrically connected with the energy storage circuit.
Optionally, the switching element comprises: a first switch end electrically connected to the tool positive terminal; the second switch end is electrically connected with the high-voltage end of the energy storage element and is electrically connected with the motor driving circuit; and the control end is electrically connected with the energy storage circuit.
Optionally, the switching element comprises: the first switch end is electrically connected with the positive terminal of the tool and is electrically connected with the motor driving circuit; the second switch end is electrically connected with the high-voltage end of the energy storage element; and the control end is electrically connected with the energy storage circuit.
Optionally, the tank circuit comprises: the high-voltage end of the first resistor is electrically connected with the tool positive terminal; and the high-voltage end of the second energy storage element is electrically connected with the low-voltage end of the first resistor, and the low-voltage end of the second energy storage element is electrically connected with the negative terminal of the tool.
Optionally, the tank circuit further comprises: a discharge diode connected in parallel with the first resistor.
Optionally, the tank circuit further comprises: and the negative end of the voltage stabilizing diode is electrically connected with the low-voltage end of the first resistor, and the positive end of the voltage stabilizing diode is electrically connected with the high-voltage end of the second energy storage element.
Optionally, the energy storage element is an electrolytic capacitor, and a capacitance value of the electrolytic capacitor is greater than or equal to 200 uF.
Optionally, the voltage of the battery pack is greater than or equal to 18V.
In combination with a power tool, a battery pack detachably mountable to the power tool, the battery pack comprising: the battery core group comprises a plurality of electrically connected battery cores; the positive power supply terminal is electrically connected to the positive electrode of the electric core group; a negative power terminal electrically connected to the negative electrode of the core pack; the electric tool includes: the tool positive terminal is used for being connected with the positive power supply terminal of the battery pack; a tool negative terminal for connection to a negative power terminal of the battery pack; a function member for realizing a function of the electric tool; the motor is operably connected with the functional part to drive the functional part to work; the motor driving circuit is electrically connected with the motor and used for driving the motor to output power; an energy storage element connected in parallel with the motor drive circuit; and the delay control circuit is electrically connected with the energy storage element and is used for connecting the conductive path of the energy storage element within a preset time.
Optionally, the energy storage element is an electrolytic capacitor, and a capacitance value of the electrolytic capacitor is greater than or equal to 200 uF.
Optionally, the voltage of the battery pack is greater than or equal to 18V.
The invention has the advantages that: at the initial stage of mounting the battery pack to the electric tool, the generation of electric sparks at the connection terminals of the electric tool and the battery pack can be greatly reduced.
Drawings
Fig. 1 is an external view structural view of an electric power tool as an embodiment;
fig. 2 is a circuit system diagram of the electric power tool of the first embodiment;
fig. 3 is a circuit system diagram of the electric power tool of the second embodiment;
fig. 4 is a circuit system diagram of the electric power tool of the third embodiment;
fig. 5 is a circuit diagram of the electric power tool of the fourth embodiment.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The power tool of the present invention includes, but is not limited to, the following: electric tools needing speed regulation, such as a screwdriver, an electric drill, a wrench, an angle grinder and the like, electric tools possibly used for grinding workpieces, such as a sander and the like, and a reciprocating saw, a circular saw, a curve saw and the like possibly used for cutting the workpieces; electric hammers and the like may be used as electric tools for impact use. These tools may also be garden-type tools, such as lawn mowers, snow throwers, suction blowers, pruners, and chain saws; in addition, the tools may be used for other purposes, such as a blender. It is within the scope of the present invention to provide electric tools that are capable of adopting the technical solution disclosed below, in particular electric tools with relatively high power that are powered by a battery pack, the voltage of which is greater than or equal to 18V.
The electric tool includes: the tool positive terminal is used for connecting the positive power supply terminal of the battery pack; a tool negative terminal for connection to a negative power terminal of the battery pack; a function member for realizing a function of the electric tool; and the motor is operably connected with the functional part to drive the functional part to work.
Referring to fig. 1, an electric power tool 10 according to an embodiment is an electric power tool 10, which includes: motor 11 (fig. 2), chassis 12, handle 13, wheels 14, and blades (not shown). Of course, the power tool 10 may also be a riding lawn mower, or a power tool that performs other functions.
The blade is a function of the lawn mower for realizing a mowing function of the lawn mower, and is provided in the floor pan 12.
The motor is used for driving the blade to rotate. The motor 11 is operatively connected to the tool attachment to drive the tool attachment in operation. For a lawnmower, the function is a blade and the motor 11 is operatively connected to the blade to drive the blade to rotate to perform a mowing function. The motor 11 may be directly connected to the blade or may be connected to the blade through a transmission or a reduction mechanism to drive the blade.
The chassis 12 is used to carry and mount the motor 11. The chassis 12 is formed with a cutting cavity (not shown). The blade rotates within the cutting chamber. The motor 11 may be a motor powered by electric power or an internal combustion engine powered by fuel combustion. In some embodiments, the motor 11 is a brushless motor. The power tool 10 is powered using a battery pack 20, and the lawn mower is provided with a battery compartment 17 for accommodating the battery pack 20, the battery compartment 17 being provided in an upper portion of the chassis 12.
The handle 13 is held by a user to operate the power tool 10. For a lawnmower, the handle 13 is used to propel the lawnmower. The handle 13 is connected to the chassis 12. For a walk-behind mower, a linkage 19 is also included. A link 19 connects the handle 13 and the chassis 12. As an alternative embodiment, the handle 13 may be formed as one piece with the link 19. The mower further comprises a trigger 15 and a switch box 16, the trigger 15 being used to control the motor. The trigger 15 is pivotally connected to a switch box 16, the switch box 16 being fixed to the handle 13 or the link 19.
The wheels 14 rotate relative to the chassis 12 to enable movement of the mower over the ground. As an alternative embodiment, the mower includes a self-propelled motor that drives the wheels 14 in rotation.
As described above, the electric power tool 10 is not limited to the above-described mower, and may be another electric power tool, such as a garden-type electric power tool of a riding mower, a snow blower, a suction blower, a pruner, and a chain saw, a hand-held electric power tool of a reciprocating saw, a circular saw, a jig saw, a circular saw, an angle grinder, an electric drill, a screwdriver, an electric drill, a wrench, or a table-type tool.
Referring to fig. 2, the operation of the power tool 10 described above also relies on circuitry that includes circuit components, at least some of which are disposed on a circuit board (not shown) disposed in the housing 18 of the power tool 10.
The circuitry of the power tool 10 generally includes: motor drive circuit 110, energy storage element 120, motor 11, battery package 20.
The battery pack 20 includes a casing 21 (fig. 1) and a plurality of battery cells 22 accommodated in the casing 21, wherein the battery cells 22 can be repeatedly charged, and the plurality of battery cells 22 are electrically connected to form a battery cell group 23. The battery pack 20 further includes connection terminals for connection with the connection terminals of the power tool 10. The connection terminals of the battery pack 20 include a positive power supply terminal 23a and a negative power supply terminal 23b, and the positive power supply terminal 23a and the negative power supply terminal 23b are electrically connected to the positive and negative electrodes of the electric core pack 23, respectively.
The connection terminals of the power tool 10 include a tool positive terminal 10a and a tool negative terminal 10b for connection with a positive power supply terminal 23a and a negative power supply terminal 23b of the battery pack 20, respectively, to transmit electric power. When the battery pack 20 is attached to the electric power tool 10, the positive power supply terminal 23a and the negative power supply terminal 23b of the battery pack 20 are electrically connected to the tool positive terminal 10a and the tool negative connection terminal 10b of the electric power tool 10, respectively.
The motor driving circuit 110 is used to drive the motor to output power. The motor driving circuit 110 is electrically connected to the motor 11, and is configured to drive the motor 11 to output power. As an embodiment, the motor 11 is a brushless motor. The motor driving circuit 11 may include a control chip, a driving chip, a switching circuit, etc., which are well known to those skilled in the art and will not be described in detail herein.
The energy storage element 120 is connected in parallel with the motor drive circuit 110 for filtering and absorbing ripple effects. The energy storage element 120 is a capacitor with a high capacitance, wherein the capacitance value of the capacitor is greater than 200 uF. In some embodiments, the capacitor is one of an electrolytic capacitor, a double layer capacitor, and a thin film capacitor. Specifically, the energy storage element 120 includes at least one electrolytic capacitor C.
The electric power tool 10 further includes a signal switch K electrically connected to the motor drive circuit 110, and the motor drive circuit 110 can drive or stop driving the motor 11 according to the on/off state of the signal switch K.
The signal switch K is connected with the trigger 15 in an associated mode, and the signal switch K is triggered by the trigger 15 to change the on-off state. The signal switch K is electrically connected to the motor driving circuit 110, and the motor driving circuit 110 can detect the on-off state of the signal switch K, so as to drive the motor 11 or stop driving the motor 11 according to an output signal corresponding to the state of the signal switch K.
In the conventional electric tool, a power main switch is provided in series on a power-on circuit of the electric tool, which is provided between the motor drive circuit 110 and the tool positive terminal 10a, and is located at the front end of the energy storage element 110. When the battery pack 20 is attached to the electric power tool, the motor drive circuit 110 is not powered if the power master switch is not triggered to the on state.
The energy storage element 110 is embodied as a capacitor, and if the voltage difference between the initial voltage and the charging voltage on the capacitor is large, a large instantaneous current is generated by the formula i = C × dV/dt of the current of the capacitor. Therefore, in the initial stage of mounting the battery pack 20 to the power tool 10, the voltage across the capacitor (the energy storage element 110) is low, the battery pack 20 charges the energy storage element 110, a large current is generated at the moment of charging the energy storage element 110, and if an air gap does not exist between the connection terminal of the power tool 10 and the connection terminal of the battery pack 20, the large current breaks through the air gap, which results in an electric spark between the connection terminal of the power tool 10 and the connection terminal of the battery pack 20.
Moreover, since the conventional power tool is provided with a power switch (fig. 1) connected to the tool positive terminal of the power tool and the energy storage element 110 is connected behind the power switch, when the power main switch is not fully closed, the large current may cause the contact of the power main switch to be ablated or stuck, which may reduce the life of the power main switch.
In the present embodiment, the signal switch K is used to replace a conventional main power switch, and a large current does not flow through the signal switch K, so that the service life of the switch is not reduced, but an electric spark is still generated between the connection terminal of the power tool 10 and the connection terminal of the battery pack 20 due to the energy storage element 110.
In order to solve the above problem, the electric power tool 10 of the present embodiment is provided with a delay control circuit 130. The delay control circuit 130 is electrically connected to the energy storage element 120, and is configured to connect to the conductive path of the energy storage element 120 within a preset time. In this way, the energy storage element 120 is turned on in a delayed manner, and after the switching element VT1 is turned on in a delayed manner, the battery pack 20 charges the energy storage element 120 again, and at this time, the battery pack 20 is already in stable contact with the connection terminal of the power tool 10, and no spark is generated at the connection between the power tool 10 and the battery pack 20.
The delay control circuit 130 includes: a switching element VT1 and a tank circuit, wherein the switching element VT1 is electrically connected to the tank element 120 for switching on or off the conductive path of the tank element 120; the energy storage circuit is electrically connected with the switching element VT1 and is used for controlling the switching element VT1 to be conducted within a preset time. The switching element VT1 may be a semiconductor switch, such as a field effect transistor, a bipolar transistor, or the like.
The circuit tool 10 shown in fig. 2, the switching element VT1 of the delay control circuit 130, which is disposed between the tool negative terminal 10b and the energy storage element 120, is located on the main circuit of the power tool 10.
The switching element VT1 includes a first switching terminal a1, a second switching terminal b1 and a control terminal c 1. Wherein the first switch terminal a1 is electrically connected with the tool negative terminal 10 b; the second switch terminal b1 is electrically connected to the low voltage terminal of the energy storage element 120 and electrically connected to the motor driving circuit 110; the control terminal c1 is electrically connected to the tank circuit. The switching element VT1 can make or break the electrical connection of the energy storage element 120 to the tool negative terminal 10 b. The switching element VT1 can electrically connect the energy storage element 120 to the tool negative terminal 10b and can electrically connect the motor drive circuit 110 to the tool negative terminal 10 b.
As an alternative, the tank circuit comprises: the high-voltage end of the first resistor R11 is electrically connected with the positive terminal 10a of the tool, the high-voltage end of the second energy storage element C1 is electrically connected with the low-voltage end of the first resistor R11, and the low-voltage end of the second energy storage element C1 is electrically connected with the negative terminal 10b of the tool. The high voltage terminal of the second energy storage element C1 is also electrically connected with the control terminal C1 of the switching element VT 1. The second energy storage element C1 is embodied as a capacitor.
After the connection terminals of the battery pack 20 are in contact connection with the connection terminals of the power tool 10 when the battery pack 20 is mounted to the power tool 10, the battery pack 20 charges the second energy storage element C1 through the first resistor R11. After a preset period of time, the second energy storage element C1 is fully charged, which can provide voltage to the switching element VT1 to turn on, so that the conductive path of the energy storage element 120 is switched on, and the battery pack 20 can charge the energy storage element 120, and at this time, the battery pack 20 is already in stable contact with the connection terminal of the power tool 10, and no spark is generated at the connection between the power tool 10 and the battery pack 20. After this, the energy storage element 120 operates normally for filtering and absorbing ripple effects.
In order to ensure that the second energy storage element C1 can provide a stable voltage to the switching element VT1 to conduct after being fully charged, the energy storage circuit further includes a second resistor R12 as a pull-up resistor for providing a stable conducting voltage to the control terminal of the switching element VT 1.
Optionally, the tank circuit further comprises a discharge diode D1. After the battery pack 20 is removed from the power tool 10, the second energy storage element C1 can be discharged through the discharge diode D1 without being discharged through the first resistor R11, so that the problem of slow discharge speed of the second energy storage element C1 through the first resistor R11 can be avoided. According to the scheme, the second energy storage element C1 can be rapidly discharged by arranging the discharge diode D1.
Alternatively, the tank circuit includes a zener diode DZ1 for preventing the battery pack 10 from over-discharging. The cathode terminal of the zener diode DZ1 is electrically connected to the low voltage terminal of the first resistor R11, and the anode terminal of the zener diode DZ1 is electrically connected to the high voltage terminal of the second energy storage element C1. The breakdown voltage of the zener diode DZ1 is less than the voltage of the battery pack 20.
Optionally, the power tool further includes a third resistor R13 connected in parallel with the switching element VT1 for powering on a control chip and the like in the motor driving circuit 110 with a small current when the switching element VT1 is not turned on, so that the power tool 10 is not immediately turned on due to the delayed turn-on of the switching element VT 1.
Specifically, both ends of the third resistor R13 are electrically connected to the first switch terminal a1 and the second switch terminal b1 of the switching element VT1, respectively.
After the battery pack 20 is mounted to the electric power tool 10, the positive power terminal 23a and the negative connection terminal 23b of the battery pack 20 are respectively in contact connection with the tool positive terminal 10a and the tool negative terminal 10b of the electric power tool 10, the zener diode DZ1 operates in the reverse breakdown region, and the battery pack 20 charges the second energy storage element C1 through the zener diode DZ1 via the first resistor R11.
When the voltage of the battery pack 20 is smaller than the breakdown voltage of the voltage stabilizing diode DZ1, the voltage stabilizing diode DZ1 cannot breakdown, the reverse resistance is large, the battery pack 20 cannot charge the second energy storage element C1 through the first resistor R11, the battery pack cannot supply power to the energy storage circuit, and the battery pack 20 can be prevented from being over-discharged. Therefore, by providing the zener diode DZ1 and selecting an appropriate breakdown voltage of the zener diode DZ1, the over-discharge of the battery pack 20 can be avoided.
A power tool 30 of a second embodiment shown in fig. 3 has a tool positive terminal 30a and a tool negative terminal 30b for electrical connection with a positive power supply terminal 23a and a negative power supply terminal 23b of a battery pack 20, respectively, and the power tool 30 circuitry includes: the motor 31, the motor driving circuit 310, the energy storage element 320, the delay control circuit 330, the signal switch K, the third resistor R33, and the like. The above-described circuit components of the circuit system of the power tool 30 are identical or similar in structure and function to the components of the circuit system of the power tool 10 shown in fig. 2, and are not described again here.
The main difference between the power tool 30 shown in fig. 3 and the power tool 10 shown in fig. 2 is the delay control circuit (130, 330).
Specifically, the delay control circuit 330 of the power tool 30 includes a switching element VT3 and a tank circuit including a first resistor R31 and a second tank element C3, the tank circuit optionally including a second resistor R32, a zener diode DZ3, and a discharge diode D3. The function and composition of the tank circuit of the power tool 30 are the same or similar to those of the tank circuit of the power tool 10, and are not described in detail herein. The difference is that the position, connection relationship, and function of the switching element VT3 of the delay control circuit 330 are different from those of the electric power tool 10 shown in fig. 2.
The switching element VT3 of the delay control circuit 330 of the power tool 30 shown in fig. 3 is provided between the tool positive terminal 30a and the energy storage element 320. The switching element VT3 has a first terminal a3, a second terminal b3 and a control terminal c 3. Wherein the first end a3 of the switching element VT3 is electrically connected with the tool positive terminal 30 a; the second switch end b3 of the switch element VT3 is electrically connected to the high voltage end of the energy storage element 320 and electrically connected to the motor driving circuit 310; the control terminal c3 of the switching element VT3 is electrically connected to the tank circuit. Specifically, the control terminal of the switching element VT3 is electrically connected to the high-voltage terminal of the second energy storage element C3. The switching element VT3 is capable of electrically connecting the energy storage element 320 to the positive tool terminal 30a and is capable of electrically connecting the motor drive circuit 310 to the positive tool terminal 30 a.
Referring to fig. 4, as a power tool 40 of the third embodiment having a tool positive terminal 40a and a tool negative terminal 40b for electrical connection with the positive power supply terminal 23a and the negative power supply terminal 23b of the battery pack 20, respectively, the power tool 40 circuit system includes: the motor 41, the motor driving circuit 410, the energy storage element 420, the delay control circuit 430, the signal switch K and the like. The above-described circuit components of the circuitry of the power tool 40 are identical or similar in structure and function to the components of the circuitry of the power tool 10 shown in fig. 2, and are not described again here.
The main difference between the power tool 40 shown in fig. 4 and the power tool 10 shown in fig. 2 is the delay control circuit (130, 430).
Specifically, the delay control circuit 430 of the power tool 40 includes a switching element VT4 and a tank circuit, the tank circuit includes a first resistor R41 and a second tank element C4, and the tank circuit optionally includes a second resistor R42, a zener diode DZ4, and a discharge diode D4. The function and composition of the energy storage circuit of the power tool 40 are the same as or similar to those of the energy storage circuit of the power tool 40, and are not described herein again. The difference is that the position, connection relationship and function of the switching element VT4 of the delay control circuit 430 are different from those of the electric power tool 10 shown in fig. 2.
The switching element VT4 of the delay control circuit 430 of the power tool 40 shown in fig. 4 is disposed between the tool negative terminal 40b and the energy storage element 420, and is located in a branch of the energy storage element 420. The switching element VT1 of the delay control circuit 130 of the power tool 10 shown in fig. 2 is disposed between the tool negative terminal 10b and the energy storage element 120, but is located on the main circuit of the circuitry of the power tool 10.
In the electric power tool 40 shown in fig. 4, the switching element VT4 has a first terminal a4, a second terminal b4, and a control terminal c 4. The first end a4 of the switching element VT4 is electrically connected to the low voltage end of the energy storage element 420, and the second end b4 of the switching element VT4 is electrically connected to the tool negative terminal 40b and to the motor driving circuit 410. The switching element VT4 can complete the electrical connection between the energy storage element 410 and the tool negative terminal 40b, and can complete the electrical connection between the motor drive circuit 410 and the energy storage element 420.
Referring to fig. 5, as a fourth embodiment of an electric power tool 50 having a tool positive terminal 50a and a tool negative terminal 50b for electrical connection with a positive power supply terminal 23a and a negative power supply terminal 23b of a battery pack 20, the electric power tool 50 circuit system includes: the motor 51, the motor drive circuit 510, the energy storage element 520, the delay control circuit 530, the signal switch K and the like. The above-mentioned circuit components of the circuit system of the power tool 50 are identical or similar in structure and function to the components of the circuit system of the power tool 40 shown in fig. 4, and are not described again here.
The main difference between the power tool 50 shown in fig. 5 and the power tool 40 shown in fig. 4 is the delay control circuit.
Specifically, the delay control circuit 530 of the power tool 50 includes a switching element VT5 and a tank circuit, the tank circuit includes a first resistor R51 and a second tank element C5, and the tank circuit optionally includes a second resistor R52, a zener diode DZ5, and a discharge diode D5. The function and composition of the energy storage circuit of the power tool 50 are the same as or similar to those of the energy storage circuit of the power tool 50, and are not described herein again. The difference is that the position, connection relationship and function of the switching element VT5 of the delay control circuit 530 are different from those of the electric power tool 40 shown in fig. 4.
The switching element VT5 of the delay control circuit 530 of the power tool 50 shown in fig. 5 is disposed between the tool positive terminal 50a and the energy storage element 520, and is disposed in a branch of the energy storage element 520. The switching element VT5 has a first terminal a5, a second terminal b5 and a control terminal c 5. Wherein, the first end a5 of the switching element VT5 is electrically connected with the tool positive terminal 30a and electrically connected with the motor driving circuit 510; the second switch end b5 of the switch element VT5 is electrically connected with the high-voltage end of the energy storage element 520; the control terminal c5 of the switching element VT5 is electrically connected to the tank circuit. Specifically, the control terminal C5 of the switching element VT5 is electrically connected to the high voltage of the second energy storage element C5. The switching element VT5 is capable of electrically connecting the energy storage element 520 to the tool positive terminal 50a and is capable of electrically connecting the energy storage element 520 to the motor drive circuit 510.
In the electric tool shown in fig. 2 to 5, the delay control circuit is provided, so that the energy storage element (120, 320, 420, 520) is not charged immediately after the battery pack is connected to the electric tool, but the delay control circuit is provided to switch on the conductive path of the energy storage element (120, 320, 420, 520) after a preset time, so that the battery pack delays to charge the energy storage element (120, 320, 420, 520), and the battery pack is stably contacted with the connecting terminal of the electric tool at the moment, and no spark is generated at the connecting part of the electric tool 10 and the battery pack 20. Therefore, the problem that electric sparks are generated at the connecting terminal when the battery pack is inserted into the electric tool of the electric tool powered by the battery pack can be solved, and the electric tool powered by the battery pack has very important significance particularly for the electric tool with high power and high voltage of the used power supply battery pack. In the electric tools (10, 30) shown in fig. 2 and 3, the switching elements (VT 1, VT 4) of the delay control circuits (130, 330) are arranged on the main circuit of the circuit system, so that the system and the energy storage elements (120, 320) have good working synchronism and are relatively stable. In the electric power tools (40, 50) shown in fig. 4 and 5, the switching elements (VT 4, VT 5) of the delay control circuits (430, 530) are provided in the branches of the energy storage elements (420, 520), and the switching elements (VT 4, VT 5) pass only the current in the branches of the energy storage elements (420, 520), so that the heat generation amount is small and the power loss is small.
The invention also provides a battery pack and an electric tool combination, wherein the battery pack is detachably mounted on the electric tool.
The battery pack includes: the battery core group comprises a plurality of electrically connected battery cores; the positive power supply terminal is electrically connected to the positive electrode of the electric core group; and the negative power supply terminal is electrically connected to the negative electrode of the battery pack.
The electric tool includes: the tool positive terminal is used for connecting the positive power supply terminal of the battery pack; a tool negative terminal for connection to a negative power terminal of the battery pack; a function member for realizing a function of the electric tool; the motor is operably connected with the functional part to drive the functional part to work; the motor driving circuit is electrically connected with the motor and used for driving the motor to output power; an energy storage element connected in parallel with the motor drive circuit; and the delay control circuit is electrically connected with the energy storage element and is used for connecting the conductive path of the energy storage element within a preset time. The power tool and the battery pack may be any one of the above embodiments, and are not described herein again.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (14)
1. A power tool powered using a battery pack removably mounted to the power tool, the power tool comprising:
the tool positive terminal is used for connecting the positive power supply terminal of the battery pack;
a tool negative terminal for connection to a negative power terminal of the battery pack;
a function member for realizing a function of the electric tool;
the motor is operably connected with the functional part to drive the functional part to work;
the motor driving circuit is electrically connected with the motor and used for driving the motor to output power;
an energy storage element connected in parallel with the motor drive circuit;
and the delay control circuit is electrically connected with the energy storage element and is used for connecting the conductive path of the energy storage element within a preset time.
2. The power tool of claim 1, wherein:
the delay control circuit includes:
the switching element is electrically connected with the energy storage element and is used for switching on or switching off the conductive path of the energy storage element;
the energy storage circuit is electrically connected with the switching element and is used for controlling the switching element to be conducted within preset time;
the switching element is connected in series between the energy storage circuit and the energy storage element.
3. The power tool of claim 2, wherein:
the switching element includes:
a first switch end electrically connected to the tool negative terminal;
the second switch end is electrically connected with the low-voltage end of the energy storage element and is electrically connected with the motor driving circuit;
and the control end is electrically connected with the energy storage circuit.
4. The power tool of claim 2, wherein:
the switching element includes:
the first switch end is electrically connected with the low-voltage end of the energy storage element;
the second switch end is electrically connected with the negative terminal of the tool and the motor driving circuit;
and the control end is electrically connected with the energy storage circuit.
5. The power tool of claim 2, wherein:
the switching element includes:
a first switch end electrically connected to the tool positive terminal;
the second switch end is electrically connected with the high-voltage end of the energy storage element and is electrically connected with the motor driving circuit;
and the control end is electrically connected with the energy storage circuit.
6. The power tool of claim 2, wherein:
the switching element includes:
the first switch end is electrically connected with the positive terminal of the tool and is electrically connected with the motor driving circuit;
the second switch end is electrically connected with the high-voltage end of the energy storage element;
and the control end is electrically connected with the energy storage circuit.
7. The power tool of claim 1, wherein:
the tank circuit includes:
the high-voltage end of the first resistor is electrically connected with the tool positive terminal;
and the high-voltage end of the second energy storage element is electrically connected with the low-voltage end of the first resistor, and the low-voltage end of the second energy storage element is electrically connected with the negative terminal of the tool.
8. The power tool of claim 7, wherein:
the tank circuit further comprises:
a discharge diode connected in parallel with the first resistor.
9. The power tool of claim 7, wherein:
the tank circuit further comprises:
and the negative end of the voltage stabilizing diode is electrically connected with the low-voltage end of the first resistor, and the positive end of the voltage stabilizing diode is electrically connected with the high-voltage end of the second energy storage element.
10. The power tool of claim 1, wherein: the energy storage element is an electrolytic capacitor, and the capacitance value of the electrolytic capacitor is greater than or equal to 200 uF.
11. The power tool of claim 1, wherein: the voltage of the battery pack is greater than or equal to 18V.
12. In combination with a power tool, a battery pack detachably mountable to the power tool, the battery pack comprising:
the battery core group comprises a plurality of electrically connected battery cores;
the positive power supply terminal is electrically connected to the positive electrode of the electric core group;
a negative power terminal electrically connected to the negative electrode of the core pack;
the electric tool includes:
the tool positive terminal is used for being connected with the positive power supply terminal of the battery pack;
a tool negative terminal for connection to a negative power terminal of the battery pack;
a function member for realizing a function of the electric tool;
the motor is operably connected with the functional part to drive the functional part to work;
the motor driving circuit is electrically connected with the motor and used for driving the motor to output power;
an energy storage element connected in parallel with the motor drive circuit;
and the delay control circuit is electrically connected with the energy storage element and is used for connecting the conductive path of the energy storage element within a preset time.
13. The battery pack and power tool combination of claim 12, wherein: the energy storage element is an electrolytic capacitor, and the capacitance value of the electrolytic capacitor is greater than or equal to 200 uF.
14. The battery pack and power tool combination of claim 12, wherein: the voltage of the battery pack is greater than or equal to 18V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910245095.6A CN111745598B (en) | 2019-03-28 | 2019-03-28 | Electric tool, battery pack and electric tool combination |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910245095.6A CN111745598B (en) | 2019-03-28 | 2019-03-28 | Electric tool, battery pack and electric tool combination |
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| CN111745598A true CN111745598A (en) | 2020-10-09 |
| CN111745598B CN111745598B (en) | 2023-06-23 |
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| WO2024032318A1 (en) * | 2022-08-11 | 2024-02-15 | 南京泉峰科技有限公司 | Electronic combination, battery pack, and electric tool and charging control method therefor |
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| Publication number | Publication date |
|---|---|
| CN111745598B (en) | 2023-06-23 |
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