Hall speed regulation integrated switch and electric power tool with same

Abstract

This invention relates to the field of integrated switch technology, specifically to a Hall effect speed-regulating integrated switch and an electric tool incorporating the Hall effect speed-regulating integrated switch. The Hall effect speed-regulating integrated switch includes a housing; a control circuit board fixed within the housing, connected to a Hall effect speed-regulating unit and an on / off unit; a commutation circuit board vertically connected to a first surface of the control circuit board, with commutation guide vanes; and a commutation mechanism including a commutation spring and a commutation drive assembly, the commutation drive assembly being adapted to drive the commutation spring to actuate in conjunction with the commutation guide vanes to achieve commutation. By splitting the original monolithic circuit board into a control circuit board and a commutation circuit board, and arranging the control circuit board and commutation circuit board perpendicularly, the control circuit board no longer needs commutation-related structures, thereby reducing the space occupied by the control circuit board, and consequently reducing the housing volume, making it easier to use.

Description

Technical Field

[0001] This invention relates to the field of integrated switch technology, and more specifically to a Hall effect speed control integrated switch and an electric tool having the Hall effect speed control integrated switch. Background Technology

[0002] An integrated switch is a switch that integrates the mechanical parts of the switch with the circuit control system, used to control the operation of power tools. Common power tools include electric drills, electric grinders, electric wrenches, electric hammers, impact drills, concrete vibrators, and electric planers. Integrated switches can be used to start, stop, and adjust the speed or direction of the power tool's motor. Among these, Hall effect speed control integrated switches are widely used due to their long lifespan and other advantages.

[0003] Existing Hall effect speed control integrated switches generally only have one circuit board, which contains commutation mechanism, speed control mechanism, on / off mechanism, etc. The circuit board is relatively bulky, resulting in a large housing size to accommodate the circuit board, which in turn makes the entire Hall effect speed control integrated switch large in size and inconvenient to use. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of large size of Hall speed control integrated switches in the prior art, thereby providing a Hall speed control integrated switch and an electric tool having the same.

[0005] This invention provides a Hall effect speed control integrated switch, comprising:

[0006] case;

[0007] A control circuit board is fixed inside the housing, and the control circuit board is connected to a Hall speed control unit and an on / off unit.

[0008] A commutation circuit board is vertically connected to the first surface of the control circuit board, and the commutation circuit board is provided with commutation guide plates.

[0009] A reversing mechanism includes a reversing spring and a reversing drive assembly, the reversing drive assembly being adapted to drive the reversing spring to move in coordination with the reversing spring to achieve reversing.

[0010] Optionally, the control circuit board is provided with a conductive spring, and the commutation circuit board is slidably installed in the housing. The commutation circuit board is connected to the control circuit board through the conductive spring.

[0011] Optionally, the guide vane includes:

[0012] The constant-contact commutator slide is always in contact with the commutator spring;

[0013] First guide card change;

[0014] Second guide plate replacement;

[0015] The normally contact commutator, the first commutator, and the second commutator are disposed on the same surface of the commutation circuit board and spaced apart from each other. The commutation spring has a first state in which it is in contact with the normally contact commutator and the first commutator simultaneously, and a second state in which it is in contact with the normally contact commutator and the second commutator simultaneously. The commutation drive assembly is adapted to drive the commutation spring to slide along the commutation circuit board to switch between the first state and the second state to achieve commutation.

[0016] Optionally, the commutation drive assembly is a commutation rod, which is rotatably mounted on the housing. The commutation spring is fixed to the side of the commutation rod facing the commutation circuit board. The commutation rod switches the commutation spring between a first state and a second state by rotating.

[0017] Optionally, the Hall effect speed control unit includes:

[0018] The movable frame is slidably mounted on the housing, and the sliding direction is parallel to the control circuit board;

[0019] A magnet, which is fixedly connected to the movable frame;

[0020] A Hall element, wherein the Hall element is fixed on the control circuit board;

[0021] The distance between the magnet and the Hall element is adjusted by sliding the movable frame, thereby achieving speed regulation.

[0022] Optionally, the on / off unit includes:

[0023] First conductive sheet;

[0024] Second conductive sheet;

[0025] Third conductive sheet;

[0026] A contact spring is fixedly installed on the movable frame;

[0027] The first conductive sheet, the second conductive sheet, and the third conductive sheet are all disposed on the first board surface of the control circuit board and are spaced apart from each other. The on / off spring has an open state that is in contact with the first conductive sheet and the second conductive sheet simultaneously, and an open state that is in contact with the first conductive sheet and the third conductive sheet simultaneously. The on / off spring can switch between the open state and the open state by sliding with the movable frame, and the length of the third conductive sheet ensures that the on / off spring has a certain adjustment lead so that the Hall speed regulating unit can realize speed regulation.

[0028] Optionally, the housing is provided with a heat dissipation window, and the Hall effect speed control integrated switch further includes a heat dissipation structure, the heat dissipation structure comprising:

[0029] An aluminum substrate, which covers the second surface of the control circuit board;

[0030] A heat-conducting sheet covers the aluminum substrate and is exposed to the housing through the heat dissipation window;

[0031] The heat sink is fixed to the outside of the housing and is in contact with the heat-conducting sheet.

[0032] Optional, also includes:

[0033] The chip is located on the second board surface of the control circuit board and is connected to the output terminal of the Hall speed control unit;

[0034] An electronic switch is disposed on the first surface of the control circuit board and connected to the chip; the electronic switch is adapted to connect to a motor.

[0035] The chip is adapted to drive the electronic switch to turn on after being powered on, so that the power supply provides power to the motor.

[0036] Optionally, the housing includes a base, a middle seat, and a top cover.

[0037] The present invention provides an electric tool, including the Hall effect speed control integrated switch as described above.

[0038] The technical solution of this invention has the following advantages:

[0039] 1. The Hall effect speed control integrated switch provided by this invention includes a housing; a control circuit board with a Hall effect speed control unit and an on / off unit; a commutation circuit board vertically connected to the first surface of the control circuit board; and a commutation mechanism including a commutation spring and a commutation drive assembly. By splitting the original integral circuit board into a control circuit board and a commutation circuit board, and arranging the control circuit board and the commutation circuit board perpendicularly, the control circuit board does not need to have commutation-related structures, thereby reducing the space occupied by the control circuit board, and thus reducing the housing volume, making it convenient to use.

[0040] 2. The Hall effect speed control integrated switch provided by the present invention has a conductive spring on the control circuit board, and the commutation circuit board is slidably installed in the housing. The commutation circuit board is connected to the control circuit board through the conductive spring. By setting the conductive spring, the electrical connection with the control circuit board can be achieved, while avoiding poor contact caused by vibration during use, thus improving stability. Furthermore, the commutation circuit board can be pressed onto the conductive spring through the housing, without the need for additional fasteners, making assembly more convenient.

[0041] 3. The Hall effect speed control unit provided by this invention includes: a movable frame; a magnet fixedly connected to the movable frame; and a Hall element fixed to a control circuit board. The output voltage is controlled by changing the relative distance between the magnet and the Hall element, thereby adjusting the speed. Compared with the original mechanical speed control structure, the Hall effect speed control unit has the advantages of smaller size, simpler structure, lower cost, and longer lifespan.

[0042] 4. The on / off unit provided by the present invention includes: a first conductive sheet; a second conductive sheet; a third conductive sheet; and an on / off spring, which are fixedly installed on the movable frame. By combining the on / off unit with the Hall effect speed control unit, internal space of the housing is saved, making the structure more compact and simpler.

[0043] 5. The power tool provided by the present invention uses the Hall speed control integrated switch described in any of the above claims, and therefore has the advantages described in any of the above claims. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 This is a front cross-sectional view of the Hall effect speed control integrated switch in an embodiment of the present invention.

[0046] Figure 2 This is an exploded view of the Hall effect speed control integrated switch in an embodiment of the present invention;

[0047] Figure 3 This is a front view of the first board surface of the control circuit board in an embodiment of the present invention;

[0048] Figure 4 This is a front view of the second board surface of the control circuit board in an embodiment of the present invention;

[0049] Figure 5 This is a front view of the commutation circuit board in an embodiment of the present invention;

[0050] Figure 6 This is a schematic diagram of the structure of the movable frame in an embodiment of the present invention;

[0051] Figure 7 This is a side sectional view of the Hall effect speed control integrated switch in an embodiment of the present invention;

[0052] Explanation of reference numerals in the attached figures:

[0053] 1. Shell; 101. Base; 102. Middle base; 103. Top cover;

[0054] 2. Control circuit board; 201. Chip; 202. Capacitor; 203. Motor wire connection terminal; 204. Electronic switch;

[0055] 301. Movable frame; 302. Magnet; 303. Hall element;

[0056] 401. First conductive sheet; 402. Second conductive sheet; 403. Third conductive sheet; 404. Switch spring;

[0057] 5. Commutation circuit board; 501. Normally contact commutator; 502. First commutator; 503. Second commutator;

[0058] 601. Reversing spring; 602. Reversing lever;

[0059] 7. Conductive spring;

[0060] 801. Aluminum substrate; 802. Thermal conductive sheet; 803. Heat sink; Detailed Implementation

[0061] Example 1

[0062] Combination Figures 1-6 As shown, this embodiment of the invention provides a Hall effect speed control integrated switch, comprising: a housing 1; a control circuit board 2, which is fixed inside the housing 1, the control circuit board 2 being connected to a Hall effect speed control unit and an on / off unit; a commutation circuit board 5, which is vertically connected to the first plate surface of the control circuit board 2, the commutation circuit board 5 being provided with a commutation guide plate; and a commutation mechanism, which includes a commutation spring 601 and a commutation drive assembly, the commutation drive assembly being adapted to drive the commutation spring 601 to move, so as to cooperate with the commutation guide plate to realize commutation.

[0063] In this embodiment, the original integral circuit board is split into a control circuit board 2 and a commutation circuit board 5. By vertically arranging the control circuit board 2 and the commutation circuit board 5, the space occupied by the circuit board is reduced, the structure is simple, the assembly is convenient, and the volume of the housing 1 is reduced, making it convenient to use.

[0064] Specifically, the control circuit board 2 is equipped with a conductive spring 7, and the commutation circuit board 5 is slidably installed inside the housing 1. The commutation circuit board 5 is connected to the control circuit board 2 via the conductive spring 7. The use of the conductive spring 7 reduces poor contact caused by vibration during motor operation, thus improving stability. In other implementations, the commutation circuit board 5 and the control circuit board 2 can be vertically fixed inside the housing 1 and then connected by wires; or the commutation circuit board 5 and the control circuit board 2 can be directly snapped together vertically.

[0065] Specifically, the commutation guide includes: a normally contact commutation guide 501, which is always in contact with the commutation spring 601; a first commutation guide 502; and a second commutation guide 503. The normally contact commutation guide 501, the first commutation guide 502, and the second commutation guide 503 are disposed on the same surface of the commutation circuit board 5 and are spaced apart from each other. The commutation guide has a first state in which it is in contact with both the normally contact commutation guide 501 and the first commutation guide 502, and a second state in which it is in contact with both the normally contact commutation guide 501 and the second commutation guide 503. The commutation drive assembly is adapted to drive the commutation guide to slide along the commutation circuit board 5 to switch between the first state and the second state to achieve commutation.

[0066] Preferably, the commutation drive assembly is a commutation rod 602, which is rotatably mounted on the housing 1, and the commutation spring 601 is fixed on the side of the commutation rod 602 facing the commutation circuit board 5.

[0067] In other embodiments, the reversing spring 601 can be directly driven to slide by the sliding member to achieve reversing, or a structure such as a paddle can be used to replace the reversing rod 602.

[0068] Specifically, the Hall effect speed control unit includes: a movable frame 301, which is slidably mounted on the housing 1 and the sliding direction is parallel to the control circuit board 2; a magnet 302, which is fixedly connected to the movable frame 301; and a Hall element 303, which is fixed to the control circuit board 2. The distance between the magnet 302 and the Hall element 303 is adjusted by the sliding of the movable frame, thereby achieving speed control.

[0069] Compared with the original mechanical speed control structure, the use of Hall effect speed control units has the advantages of smaller size, simpler structure, lower cost and longer service life.

[0070] In this embodiment, a permanent magnet 302 is used as the magnet 302, which theoretically has an unlimited lifespan, thus greatly improving the service life of the switch. In other embodiments, a soft magnet 302 may also be used.

[0071] Specifically, the switching unit includes: a first conductive sheet 401; a second conductive sheet 402; a third conductive sheet 403; and a switching spring 404, which are fixedly installed on the movable frame 301. The first conductive sheet 401, the second conductive sheet 402, and the third conductive sheet 403 are all located on the first plate surface of the control circuit board 2 and are spaced apart from each other. The switching spring 404 has an open state that is in contact with the first conductive sheet 401 and the second conductive sheet 402 at the same time, and an open state that is in contact with the first conductive sheet 401 and the third conductive sheet 403 at the same time. The switching spring 404 can switch between the open state and the open state by sliding with the movable frame 301, and the length of the third conductive sheet 403 ensures that the switching spring 404 has a certain adjustable lead so that the Hall speed regulating unit can realize speed regulation.

[0072] Both the on / off spring 404 of the on / off unit and the magnet 302 of the Hall speed control unit are mounted on the movable frame 301. By sliding the movable frame 301, both on / off and speed control can be achieved, saving internal space of the housing 1, making the structure more compact and the operation more convenient.

[0073] In other embodiments, the on / off unit and the Hall speed control unit can be set separately and driven by two independent mechanisms.

[0074] It is easy to understand that if the length of the third conductive sheet 403 is too short, the relative distance adjustment range between the magnet 302 and the Hall element 303 will be small, which will result in a small speed adjustment range of the Hall speed control unit and affect the use of the device.

[0075] Specifically, the housing 1 includes a base 101, a middle seat 102, and a top cover 103. In this preferred embodiment, the arrangement of the base 101, the middle seat 102, and the top cover 103 makes assembly simpler and the structure more robust. In other improved embodiments, the housing 1 can also be integrally formed or divided into common structures such as an upper shell and a lower shell.

[0076] Furthermore, a button is connected to the upper end of the movable frame 301, which can increase the contact area with the hand and make it more convenient to use.

[0077] Furthermore, springs are used to fix the lower ends of the movable frame 301 and the reversing rod 602 inside the housing 1, so that the movable frame 301 can automatically reset and return to the initial non-working state after the hand is released; a spring is added to the reversing rod 606 to improve the user's feel when the reversing mechanism is changing direction.

[0078] Furthermore, the housing 1 is provided with a heat dissipation window, and the Hall effect speed control integrated switch also includes a heat dissipation structure, which includes: an aluminum substrate 801, which covers the second surface of the control circuit board 2; a heat-conducting sheet 802, which covers the aluminum substrate 801 and is exposed to the housing 1 through the heat dissipation window; and a heat sink 803, which is fixed to the outside of the housing 1 and contacts the heat-conducting sheet 802. The aluminum substrate 801 can better dissipate heat, and the multi-layer arrangement further improves the heat dissipation capacity, which can better facilitate the heat dissipation of the electronic switch 204 during use and ensure the service life of the electronic switch. In other improved embodiments, the heat dissipation structure can be a single-layer heat sink.

[0079] Furthermore, chip 201 is located on the second board surface of the control circuit board and is connected to the output terminal of the Hall speed control unit; electronic switch 204 is a MOSFET, of which there are 7, one of which is directly connected to the power supply terminal, and the other 6 MOSFETs form a three-phase bridge rectifier circuit connected to the motor. Electronic switch 204 is located on the first board surface of the control circuit board 2; chip 201 is adapted to drive electronic switch 204 to turn on after power is applied, so that the power supply provides power to the motor.

[0080] When in use, after the switch is turned on, an electrical signal is generated. The electrical signal triggers the start-up circuit, which supplies power to the chip 201 through the voltage regulator circuit, driving the electronic switch 204 to turn on. Conversely, the electronic switch 204 is turned off when the switch is turned off.

[0081] Furthermore, two capacitors 202 are installed between the power supply and the main circuit board. The capacitors 202 are connected in parallel across the two ends of the power supply to act as filters, thereby protecting the electronic switch 204.

[0082] Example 2

[0083] This embodiment also provides a power tool, including but not limited to: an electric angle grinder, an electric drill, an electric screwdriver, etc. The above-mentioned power tool uses the aforementioned Hall effect speed control integrated switch, and therefore possesses all the advantages of this integrated control switch.

[0084] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A Hall speed regulation integrated switch, characterized by, include: Shell (1); A control circuit board (2) is fixed inside the housing (1), and the control circuit board (2) is connected to a Hall speed control unit and an on / off unit; A commutation circuit board (5) is vertically connected to the first plate surface of the control circuit board (2), and a commutation guide plate is provided on the commutation circuit board (5); A reversing mechanism includes a reversing spring (601) and a reversing drive assembly, the reversing drive assembly being adapted to drive the reversing spring (601) to move in order to cooperate with the reversing guide to realize reversing; The commutation guide includes a normally contact commutation guide (501) that is always in contact with the commutation spring (601); a first commutation guide (502); and a second commutation guide (503). The normally contact commutation guide (501), the first commutation guide (502), and the second commutation guide (503) are disposed on the same surface of the commutation circuit board (5) and are spaced apart from each other. The commutation spring (601) has a first state in which it is simultaneously in contact with the normally contact commutation guide (501) and the first commutation guide (502), and a second state in which it is simultaneously in contact with the normally contact commutation guide (501) and the second commutation spring (503). The commutation drive assembly is adapted to drive the commutation spring (601) to slide along the commutation circuit board (5) to switch between the first state and the second state to achieve commutation. The commutation drive assembly is a commutation rod (602), which is rotatably mounted on the housing (1). The commutation spring (601) is fixed on the side of the commutation rod (602) facing the commutation circuit board (5). The commutation rod (602) rotates to switch the commutation spring (601) between a first state and a second state.

2. The Hall speed regulation integrated switch according to claim 1, characterized in that, The control circuit board (2) is provided with a conductive spring (7), and the commutation circuit board (5) is slidably installed in the housing (1). The commutation circuit board (5) is connected to the control circuit board (2) through the conductive spring (7).

3. The Hall speed regulation integrated switch according to any of claims 1-2, characterized in that, The Hall speed control unit includes: The movable frame (301) is slidably mounted on the housing (1), and the sliding direction is parallel to the control circuit board (2); A magnet (302) is fixedly connected to the movable frame (301); Hall element (303), the Hall element (303) is fixed on the control circuit board (2); The distance between the magnet (302) and the Hall element (303) is adjusted by sliding the movable frame, thereby achieving speed regulation.

4. The Hall speed regulation integrated switch according to claim 3, wherein The on / off unit includes: First conductive sheet (401); Second conductive sheet (402); Third conductive sheet (403); A contact spring (404) is fixedly installed on the movable frame (301); The first conductive sheet (401), the second conductive sheet (402), and the third conductive sheet (403) are all disposed on the first plate surface of the control circuit board (2) and are spaced apart from each other. The on / off spring (404) has an open state that is in contact with the first conductive sheet (401) and the second conductive sheet (402) at the same time, and an open state that is in contact with the first conductive sheet (401) and the third conductive sheet (403) at the same time. The on / off spring (404) can switch between the open state and the open state by sliding with the movable frame (301). The length of the third conductive sheet (403) ensures that the on / off spring (404) has a certain adjustment lead so that the Hall speed regulating unit can realize speed regulation.

5. The Hall speed regulation integrated switch according to any of claims 1-2, characterized in that, The housing (1) has a heat dissipation window, and the Hall speed control integrated switch further includes a heat dissipation structure, which includes: An aluminum substrate (801) covers the second surface of the control circuit board (2); A heat-conducting sheet (802) covers the aluminum substrate (801) and is exposed to the housing (1) through the heat dissipation window; The heat sink (803) is fixed to the outside of the housing (1) and is in contact with the heat-conducting sheet (802).

6. The Hall speed regulation integrated switch according to any of claims 1-2, characterized in that, Also includes: A chip (201) is disposed on the second board surface of the control circuit board and connected to the output terminal of the Hall speed control unit; An electronic switch (204) is disposed on the first board surface of the control circuit board (2) and connected to the chip (201). The electronic switch (204) is adapted to connect to a motor. The chip (201) is adapted to drive the electronic switch (204) to turn on after being powered on, so that the power supply provides power to the motor.

7. The Hall speed regulation integrated switch according to any of claims 1-2, characterized in that, The housing (1) includes a base (101), a middle seat (102), and a top cover (103).

8. A power tool characterized by comprising: Including the Hall effect speed control integrated switch as described in any one of claims 1-7.

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