A wireless charging electric screwdriver

Abstract

The utility model discloses a wireless charging electric screwdriver relates to electric screwdriver technical field, including screwdriver and base, the inside fixedly connected with battery of screwdriver, is equipped with the limit slot on the base, and one end of screwdriver is inserted to the inboard of base through limit slot, and one end fixedly connected with the tubular power receiving coil of screwdriver inboard of base, the inboard fixedly connected with the tubular power transmission coil of base, the tubular power transmission coil and tubular power receiving coil coaxial arrangement. This wireless charging electric screwdriver, inductance is big, and the coupling coefficient is high, and the wireless charging efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of electric screwdriver technology, specifically a wireless charging electric screwdriver. Background Technology

[0002] An electric screwdriver is a power tool used for tightening and loosening screws. This power tool is equipped with a mechanism for adjusting and limiting torque. It is mainly used for assembling screws and other accessories and is one of the essential tools for most manufacturing companies.

[0003] Chinese Utility Model Patent Application No. CN202322188299.5 discloses a wireless charging electric screwdriver and its base, including a base and a screwdriver. The base contains a first circuit board and a transmitting coil. The screwdriver has a rear end housing, and a rechargeable battery is fixedly connected inside the screwdriver. The rear end housing contains a second circuit board, a magnetic shielding sheet, and a receiving coil. In this wireless charging electric screwdriver and its base, both the transmitting and receiving coils are disc-shaped coils. Due to the limited diameter of the screwdriver, the coil diameter is small, affecting the inductance and resulting in low charging efficiency.

[0004] Therefore, it is necessary to propose a wireless charging electric screwdriver to solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The purpose of this invention is to provide a wireless charging electric screwdriver to solve the problem of low charging efficiency of existing wireless charging electric screwdrivers mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: a wireless charging electric screwdriver, including a screwdriver and a base, wherein a battery is fixedly connected inside the screwdriver, a limiting slot is provided on the base, one end of the screwdriver is inserted into the inner side of the base through the limiting slot, a cylindrical receiving coil is fixedly connected to the end of the screwdriver located on the inner side of the base, and a cylindrical supply coil is fixedly connected to the inner side of the base, wherein the cylindrical supply coil and the cylindrical receiving coil are coaxially arranged.

[0009] Preferably, a second circuit board is fixedly connected inside the screwdriver. The second circuit board includes a first rectifier circuit and a filter circuit. The battery and the cylindrical receiving coil are both electrically connected to the second circuit board.

[0010] Preferably, a first circuit board is fixedly connected inside the base. The first circuit board includes a second rectifier circuit and a high-frequency oscillation circuit, and the cylindrical power supply coil is electrically connected to the first circuit board.

[0011] Preferably, a charging interface is fixedly connected to the second circuit board, and the charging interface extends through to the outside of the screwdriver housing.

[0012] Preferably, the cylindrical receiving coil is fixedly connected to the inner side of the screwdriver housing.

[0013] Preferably, the cylindrical power transmitting coil is installed at the same height as the cylindrical power receiving coil.

[0014] Preferably, the cylindrical receiving coil is located at the end of the screwdriver with the bit, and the limiting slot is arranged on the upper surface of the base.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a wireless charging electric screwdriver, which has the following beneficial effects:

[0017] This wireless charging electric screwdriver uses a limiting slot on the base to limit the screwdriver's position, and achieves wireless charging through the cooperation of a cylindrical power supply coil and a cylindrical power receiving coil. It also has a large inductance and a high coupling coefficient, resulting in higher charging efficiency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional schematic diagram of the base of this utility model;

[0020] Figure 3 This is a cross-sectional view of the screwdriver of this utility model.

[0021] In the diagram: 1. Screwdriver; 2. Base; 3. Cylindrical power supply coil; 4. Limiting slot; 5. First circuit board; 6. Second circuit board; 7. Battery; 8. Cylindrical power receiving coil; 9. Charging interface. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-3As shown, a wireless charging electric screwdriver includes a screwdriver 1 and a base 2. A limiting slot 4 is provided on the base 2. One end of the screwdriver 1 is inserted into the inner side of the base 2 through the limiting slot 4. A cylindrical receiving coil 8 is fixedly connected to the end of the screwdriver 1 located inside the base 2. A cylindrical supply coil 3 is fixedly connected to the inner side of the base 2. The cylindrical supply coil 3 and the cylindrical receiving coil 8 are arranged coaxially.

[0024] In use, the end of the screwdriver 1 with the cylindrical receiving coil 8 is inserted into the limiting slot 4. The cylindrical supply coil 3 generates an alternating magnetic field, and the cylindrical receiving coil 8 induces high-frequency alternating current through magnetic coupling. After synchronous rectification and filtering, a stable direct current is output to charge the battery 7. Wireless charging is achieved by using the cylindrical supply coil 3 and the cylindrical receiving coil 8 together. The cylindrical structure allows for more turns, resulting in greater inductance and higher charging efficiency.

[0025] Specifically, the screwdriver 1 has a second circuit board 6 fixedly connected inside. The second circuit board 6 includes a first rectifier circuit and a filter circuit. The battery 7 and the cylindrical receiving coil 8 are both electrically connected to the second circuit board 6. The base 2 has a first circuit board 5 fixedly connected inside. The first circuit board 5 includes a second rectifier circuit and a high-frequency oscillation circuit. The cylindrical receiving coil 3 is electrically connected to the first circuit board 5.

[0026] The mains power is converted into DC power by the second rectifier circuit, and then inverted into high-frequency AC power by the high-frequency oscillation circuit to drive the cylindrical power transmitting coil 3 to generate an alternating magnetic field; the cylindrical power receiving coil 8 induces high-frequency AC power through magnetic coupling, and outputs stable DC power after being simultaneously rectified and filtered by the first rectifier circuit and the filter circuit, to charge the storage battery 7.

[0027] In some embodiments, as a backup charging method, a charging interface 9 is fixedly connected to the second circuit board 6, extending through to the outside of the screwdriver 1 housing. Connecting the power source to the charging interface 9 directly supplies power to the screwdriver 1, preventing the battery 7 from running out of power during use and meeting the needs of extended use.

[0028] To prevent damage to the cylindrical receiving coil 8, the cylindrical receiving coil 8 is fixedly connected to the inside of the screwdriver 1 housing.

[0029] To further improve charging efficiency, the cylindrical power supply coil 3 is installed at the same height as the cylindrical power receiving coil 8. The cylindrical power supply coil 3 and the cylindrical power receiving coil 8 form a concentric nested structure, resulting in less magnetic leakage and a higher coupling coefficient, thereby further improving charging efficiency.

[0030] To make it easier to use and put away the screwdriver 1, a cylindrical power receiving coil 8 is located at the end of the screwdriver 1 where the bit is located, and a limiting slot 4 is arranged on the upper surface of the base 2.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wireless charging electric screwdriver, comprising a screwdriver (1) and a base (2), wherein a rechargeable battery (7) is fixedly connected inside the screwdriver (1), characterized in that: A limiting slot (4) is provided on the base (2). One end of the screwdriver (1) is inserted into the inner side of the base (2) through the limiting slot (4). A cylindrical receiving coil (8) is fixedly connected to one end of the screwdriver (1) located inside the base (2). A cylindrical power supply coil (3) is fixedly connected to the inner side of the base (2). The cylindrical power supply coil (3) and the cylindrical receiving coil (8) are arranged coaxially.

2. The wireless charging electric screwdriver according to claim 1, characterized in that: The screwdriver (1) is internally fixedly connected to a second circuit board (6), which includes a first rectifier circuit and a filter circuit. The battery (7) and the cylindrical receiving coil (8) are both electrically connected to the second circuit board (6).

3. The wireless charging electric screwdriver according to claim 1, characterized in that: The base (2) is internally fixedly connected to a first circuit board (5), which includes a second rectifier circuit and a high-frequency oscillation circuit. The cylindrical power supply coil (3) is electrically connected to the first circuit board (5).

4. A wireless charging electric screwdriver according to claim 2, characterized in that: A charging interface (9) is fixedly connected to the second circuit board (6), and the charging interface (9) extends through to the outside of the screwdriver (1) housing.

5. A wireless charging electric screwdriver according to claim 1, characterized in that: The cylindrical receiving coil (8) is fixedly connected to the inside of the screwdriver (1) housing.

6. A wireless charging electric screwdriver according to claim 1, characterized in that: The installation height of the cylindrical power supply coil (3) is the same as that of the cylindrical power receiving coil (8).

7. A wireless charging electric screwdriver according to claim 1, characterized in that: The cylindrical receiving coil (8) is located at the end of the screwdriver (1) with the bit, and the limiting slot (4) is arranged on the upper surface of the base (2).

Images