CN201887566U - Non-contact power supply device for computer input device - Google Patents

Abstract

The utility model provides a can produce the non-contact power supply unit of computer input device in the even magnetic field of distribution, including drive circuit and a plurality of coil of overlapping each other. The driving circuit provides oscillation signals with different phases to be respectively input into the coils, so that magnetic fields generated by the different coils are mutually influenced, and the magnetic fields generated by the coils can be uniformly distributed. The utility model discloses an input different alternating current to a plurality of coils that overlap, can make magnetic field produce the device and produce even magnetic field. Therefore, even if the magnetic field generating device needs to generate a magnetic field in a wide range, the magnetic field intensity at the central position is not attenuated by the coil being too far from the central position.

Description

Non-contact power supply device for computer input device

technical field

The utility model relates to a non-contact power supply device of an input device, in particular to a non-contact power supply device capable of generating uniformly distributed magnetic fields.

Background technique

At present, the digital boards on the market are used with digital pens. When the digital pen is close to the digital sensor board, the digital pen will generate an electromagnetic field, so that the digital sensor board can calculate the current coordinate position of the digital pen according to the intensity of the received electromagnetic field, and then Send the coordinate position to the computer to control the cursor.

At present, there are mainly two ways to provide the power required for the digital pen to work: one is to use a battery to supply power, and the other is to use electromagnetic resonance to obtain power. If the battery-powered mode is adopted, the digital pen must frequently replace the battery, which is extremely inconvenient and environmentally friendly for the user. Therefore, the power supply method using electromagnetic resonance is not only more convenient in use, but also more friendly to the environment.

However, in current technology related to the electromagnetic resonance power supply of the digital pen and the digital sensor board, a transmitting antenna will be installed in the digital sensor board.

Generally speaking, the transmitting antenna ring of the digital sensor board is set around the inside of the body, that is, the transmitting antenna is arranged in a frame shape, and the signal strength of the transmitting antenna decreases along the center of the transmitting antenna, which will make the central position of the digital sensor board where the signal is weak. And when the area of the digital sensor board is larger, the distance between the transmitting antenna and the central position is also farther, so the weakening of the signal at the central position will be more obvious.

Contents of the invention

In view of the above problems, the utility model proposes a non-contact power supply device for a computer input device. The non-contact power supply device at least includes a driving circuit and a plurality of coils. The drive circuit provides multiple oscillation signals with different phases. At least two coils among the plurality of coils are arranged to overlap, so as to form an overlapping area and two non-overlapping areas in the two overlapping coils. The coils are used to receive oscillating signals of different phases.

In a preferred implementation manner, the phase difference of the two oscillation signals received by the two coils in the overlapping area is between 30 degrees and 180 degrees.

In addition, the non-contact power supply device proposed by the utility model is suitable for supplying power to a receiving device. The non-contact power supply device further includes a casing and a magnetic field generating device. The housing defines a power supply area. The magnetic field generating device transmits at least two electromagnetic energies of different phases to the receiving device in a non-contact manner in the power supply area.

In a preferred embodiment, the magnetic field generating device at least includes a driving circuit and a plurality of coils. The drive circuit provides multiple oscillation signals with different phases. At least two coils among the plurality of coils are arranged to overlap, so as to form an overlapping area and two non-overlapping areas in the two overlapping coils. These coils are used to receive oscillating signals of different phases.

In a preferred embodiment, the phase difference of the oscillating signals received by the two coils in the overlapping area is between 30 degrees and 180 degrees.

By inputting different alternating currents to the overlapping coils, the magnetic field generating device can generate a uniform magnetic field. Therefore, even if the magnetic field generating device needs to generate a large-scale magnetic field, the magnetic field intensity at the central position will not attenuate because the coil is too far away from the central position.

Description of drawings

FIG. 1A and FIG. 1B are schematic diagrams of relative positions of the coils in the first embodiment of the present invention;

Figure 1C is a diagram of the relationship between the direction of the oscillation signal and the magnetic field;

2A to 2H are schematic diagrams of oscillation signal waveforms;

3 is a schematic diagram of the relative positions of the coils in the second embodiment of the present invention; and

Fig. 4 is a non-contact power supply device disclosed by the utility model.

The reference numerals in the above-mentioned accompanying drawings are explained as follows:

10 magnetic field generating device

12 first coil

12a first wire segment

14 second coil

14a second wire segment

16 third coil

22 non-overlapping area

23 overlapping area

24 non-overlapping regions

25 overlapping area

26 non-overlapping area

30 drive circuit

40 receiving device

41a, 41b, 41c, 41d, 41e, 41f, 41g, 41h first oscillation signal

42a, 42b, 42c, 42d, 42e, 42f, 42g, 42h second oscillation signal

43a, 43b, 43c, 43d, 43e, 43f, 43g, 43h third oscillation signal

50 shells

51 first point

52 second point

53 third point

81 Main magnetic field direction

82 Oscillating signal direction

83 Main magnetic field direction

84 Oscillating signal direction

Detailed ways

The detailed features and advantages of the present utility model are further described in the following embodiments, the content of which is sufficient for any person skilled in the art to understand the technical content of the present utility model and implement it accordingly, and according to the content disclosed in this specification, the claims With the accompanying drawings, any person skilled in the art can easily understand the related objectives and advantages of the present utility model.

Please refer to FIG. 1A , which is a schematic diagram of the relative positions of the coils in the first embodiment of the present invention. The magnetic field generating device 10 proposed by the present invention includes a driving circuit 30 and a plurality of coils.

The driving circuit 30 can be used to provide multiple oscillating signals with different phase differences. Preferably, the oscillating signals are 90 degrees apart.

For example, when the driving circuit 30 generates two oscillating signals, the phase difference between the two oscillating signals can be made 90 degrees by the following methods, but it is not limited to the following examples. For example, an oscillating signal can be passed into a resistor-capacitor circuit, and the oscillating signal output through the resistor-capacitor circuit is 90 degrees different from the input oscillating signal. In addition, it is also possible to delay an oscillating signal by a quarter of a cycle, and to generate an oscillating signal that is 90 degrees different from the original signal.

In this embodiment, for convenience of description, only two coils (the first coil 12 and the second coil 14 ) are used as an example for illustration, but this is not intended to limit the present invention. The first coil 12 and the second coil 14 are arranged in an overlapping manner.

Please also refer to FIG. 1B , which is a schematic diagram of the relative positions of the coils in the first embodiment of the present invention. The area enclosed by the overlapping first coil 12 and the second coil 14 partially overlaps to form an overlapping area 23 and non-overlapping areas 22 , 24 . The overlapping area 23 is a part surrounded by the first coil 12 and the second coil 14 at the same time, and the non-overlapping area 22 is a part surrounded only by the first coil 12 but not surrounded by the second coil 14. The overlapping area 24 is a portion surrounded only by the second coil 14 but not surrounded by the first coil 12 .

The first coil 12 and the second coil 14 may respectively correspond to the aforementioned oscillating signals in a one-to-one manner. After the first coil 12 receives the oscillating signal, it will generate a first main magnetic field area (ie corresponding to the area surrounded by the first coil 12 : the non-overlapping area 22 and the overlapping area 23 ). After the second coil 14 receives another oscillating signal, it will generate a second main magnetic field area (ie corresponding to the area surrounded by the second coil 14 : the non-overlapping area 24 and the overlapping area 23 ). Since the first coil 12 and the second coil 14 have overlapping portions (overlapping regions 23 ), the first main magnetic field area and the second magnetic field area also have overlapping areas.

The direction of the magnetic field on the current loop can be determined using Ampere's right-hand rule. Ampere's right-hand rule is that the direction of the four fingers outside the right thumb toward the palm is regarded as the direction of the magnetic field, and the direction pointed by the thumb is the direction of the current. The magnetic field is a vector field, that is, the magnetic field has direction and magnitude. When two magnetic fields overlap, if the directions of the magnetic fields are opposite, the magnitudes of the two magnetic fields will cancel each other out.

Please refer to FIG. 1C , which is a schematic diagram of the relationship between the direction of the oscillation signal and the magnetic field. In this embodiment, the first coil 12 and the second coil 14 are substantially on the same plane, that is to say, the directions of the main magnetic fields generated by the first coil 12 and the second coil 14 are substantially parallel. The direction of the main magnetic field is defined as the normal direction on the plane surrounded by the first coil 12 or the second coil 14 (ie, the directions of the arrows labeled 81 and 82 in the figure). Substantially parallel is defined as the angle between the two directions is between plus and minus ten degrees. In particular, it should be noted that the direction of the oscillation signal and the direction of the magnetic field shown in FIG. 1C are for illustrative purposes only, and are not limitations of the present invention. As can be seen in FIG. 1C, if at a specific time point, the direction 82 of the oscillating signal of the first coil 12 is the direction of the solid arrow in the figure (counterclockwise), the direction 81 of the main magnetic field of the first coil 12 is the direction 81 in the figure. Direction of the dotted arrow (up). The oscillation signal direction 84 of the second coil 14 is the direction of the solid arrow in the figure (clockwise), and the main magnetic field direction 83 of the second coil 14 is the direction of the dotted arrow in the figure (downward). The magnetic field generated by the first coil 12 and the second coil 14 in the overlapping area 23 will cancel out each other, so that the strength of the magnetic field in the overlapping area 23 will be weakened. That is to say, the magnetic field strength of the overlapping region 23 is smaller than the magnetic field strengths of the non-overlapping region 22 and the non-overlapping region 24 . That is to say, the magnetic field intensity generated by the first coil 12 and the second coil 14 presents an uneven distribution.

In order to prevent the magnetic field from interfering with each other in the overlapping area 23 and causing the magnetic field strength to weaken, in an embodiment of the present invention, the first coil 12 and the second coil 14 can transmit oscillation signals of different phases. Please refer to FIG. 2A , which is a schematic diagram of the oscillation signal waveform. The first oscillating signal 41 a and the second oscillating signal 42 a are two oscillating signals with the same frequency and the same amplitude, but with a phase difference of 90 degrees. Here, the phase difference between the two oscillating signals is based on the direction of the oscillating signal in FIG. 1C . That is, the phase difference in FIG. 1C is defined as 0 degrees.

The first oscillating signal 41a and the second oscillating signal 42a can be input to the first coil 12 and the second coil 14 respectively, so that the first wire segment 12a of the first coil 12 and the second wire segment 14a of the second coil 14 are in the same At a certain point in time, no oscillating signals in the same direction will be generated.

Furthermore, when the amplitude of the first oscillating signal 41a is at a peak value, the amplitude of the second oscillating signal 42a is zero. And when the amplitude of the second oscillating signal 42a is at a peak value, the amplitude of the first oscillating signal 41a is zero. Therefore, the magnetic field generated by the first wire segment 12 a of the first coil 12 and the second wire segment 14 a of the second coil 14 in the overlapping region 23 will not be weakened due to mutual interference.

The third oscillating signal 43a in FIG. 2A is the difference between the first oscillating signal 41a and the second oscillating signal 42a. Because the direction of the magnetic field generated by the first coil 12 and the second coil 14 in the overlapping region 23 is opposite, the third oscillating signal 43a (the difference between the first oscillating signal 41a and the second oscillating signal 42a) is proportional to the overlapping region 23 The magnetic field strength on the . It can be seen from the figure that the peak value of the third oscillating signal 43a is about 1.408 times that of the first oscillating signal 41a or the second oscillating signal 42a.

The first coil 12 and the second coil 14 can pass through oscillating signals with a phase difference of 90 degrees in addition to passing through oscillating signals with a phase difference between 30 degrees and 180 degrees. Please refer to FIG. 2B to FIG. 2H , which are schematic diagrams of oscillation signal waveforms.

FIG. 2B represents oscillating signals with an input phase difference of 30 degrees. In FIG. 2B , the peak value of the third oscillating signal 43 b is about 0.515 times that of the first oscillating signal 41 b or the second oscillating signal 42 b. FIG. 2C represents an oscillating signal with an input phase difference of 45 degrees. In FIG. 2C , the peak value of the third oscillating signal 43 c is about 0.764 times that of the first oscillating signal 41 c or the second oscillating signal 42 c. FIG. 2D represents an oscillating signal with an input phase difference of 60 degrees. In FIG. 2D , the peak value of the third oscillating signal 43d is about 1 times that of the first oscillating signal 41d or the second oscillating signal 42d. FIG. 2E represents an oscillating signal with an input phase difference of 120 degrees. In FIG. 2E , the peak value of the third oscillating signal 43 e is about 1.732 times that of the first oscillating signal 41 e or the second oscillating signal 42 e. FIG. 2F represents an oscillating signal with an input phase difference of 135 degrees. In FIG. 2F , the peak value of the third oscillating signal 43f is about 1.732 times that of the first oscillating signal 41f or the second oscillating signal 42f. FIG. 2G represents an oscillating signal with an input phase difference of 150 degrees. In FIG. 2G , the peak value of the third oscillating signal 43g is about 1.924 times that of the first oscillating signal 41g or the second oscillating signal 42g. FIG. 2H represents oscillating signals with an input phase difference of 150 degrees. In FIG. 2H , the peak value of the third oscillating signal 43h is about twice that of the first oscillating signal 41h or the second oscillating signal 42h.

By inputting oscillating signals with different phases, the ratio of the magnetic field strength in the overlapping region 23 to the peak magnetic field strength in the non-overlapping region 22 can be between 0.5 and 2. Here, the measurement points of the magnetic field strength of the overlapping area 23, the non-overlapping area 22 and the non-overlapping area 24 are from the overlapping area 23, the non-overlapping area 22 and the non-overlapping area 24 to the first coil 12 Points at the same distance from the plane formed by the second coil 14 . Therefore, the magnetic field generated by the first coil 12 and the second coil 14 can be evenly distributed, and the strength of the magnetic field at the center of the coil can be enhanced.

In addition, in this embodiment, the oscillating signal has the same amplitude and the same frequency as an example, but it is not limited to this. In order to achieve a uniform magnetic field, the amplitude of the oscillating signal input to the first coil 12 and the second coil 14 can also be changed. and frequency. For example, the first coil 12 and the second coil 14 can input oscillating signals of different frequencies.

In addition to overlapping two coils to increase the magnetic field intensity at the center, the present invention also discloses that multiple coils can be overlapped to apply to the large-sized magnetic field generating device 10 .

Please refer to FIG. 3 , which is a schematic diagram of the relative positions of the coils in the second embodiment of the present invention. The magnetic field generating device 10 may include a first coil 12 , a second coil 14 and a third coil 16 . The first coil 12 and the second coil 14 overlap each other, and the second coil 14 and the third coil 16 overlap each other.

The overlapping portion between the first coil 12 and the second coil 14 is an overlapping area 23 , and the overlapping portion between the second coil 14 and the third coil 16 is an overlapping area 25 . The non-overlapping area 22 is a part surrounded only by the first coil 12 and not surrounded by the second coil 14, and the non-overlapping area 24 is only surrounded by the second coil 14 but not by the first coil 12 or the third coil The part surrounded by 16, the non-overlapping region 26 is only the part surrounded by the third coil 16 but not surrounded by the second coil 14.

The first coil 12 and the second coil 14 can input oscillating signals with a difference of 45 degrees, and the second coil 14 and the third coil 16 can also input oscillating signals with a difference of 45 degrees. By inputting oscillating signals of different phases, the magnetic field strength between the overlapping region 23, the overlapping region 25, the first non-overlapping region 22, the second non-overlapping region 24 and the third non-overlapping region 26 can be made The ratio of the peaks, between 0.5 and 2. Therefore, the overlapping first coil 12 , second coil 14 and third coil 16 can generate a uniformly distributed magnetic field.

Please refer to FIG. 4 , which is a non-contact power supply device disclosed in the present invention. The non-contact power supply device of the present invention can be set in a digital sensor board or a touch screen, and is used to supply power to the receiving device 40 . The receiving device 40 can be a battery-free digital stylus, allowing the digital stylus to receive power in a wireless manner to perform actions such as writing or clicking on a digital sensor pad or a touch screen.

The contactless power supply device includes a casing 50 and a magnetic field generating device 10 .

The casing 50 covers the outside of the contactless power supply device and has a surrounding area. The space within a fixed distance above the surrounding area is defined as a power supply area. When the receiving device 40 is placed in the power supply area, the receiving device 40 can receive the magnetic field emitted by the non-contact power supply device when it is not in contact with the non-contact power supply device.

The magnetic field generating device 10 includes a plurality of coils and a driving circuit 30 .

The driving circuit 30 provides at least two oscillation signals with different phases. The characteristics among the multiple oscillating signals are the same as those in the foregoing embodiments. The magnetic field generating device 10 transmits at least two electromagnetic energies of different phases to the receiving device 40 in a contactless manner in the power supply area.

This embodiment also only uses two coils (the first coil 12 and the second coil 14 ) as an example for illustration. The first coil 12 and the second coil 14 have overlapping portions. The driving circuit 30 is used for generating multiple sets of oscillating signals to be respectively supplied to the first coil 12 and the second coil 14 . According to the above-mentioned embodiment, the first coil 12 and the second coil 14 can respectively input oscillating signals with a difference of 90 degrees, so that the magnetic fields of the first coil 12 and the second coil 14 in the overlapping area will not cancel each other, so that the first coil 12 and the second coil 14 will not cancel each other. The first coil 12 and the second coil 14 can generate uniform magnetic field distribution.

Because the first coil 12 and the second coil 14 can generate a uniformly distributed magnetic field, the intensity of the magnetic field received by the receiving device 40 at the first point 51 , the second point 52 and the third point 53 will not differ greatly. Therefore, when the receiving device 40 is operated at any position on the magnetic field generating device 10, it can receive a magnetic field with a signal strength close to that of the receiving device 40, so that the receiving device 40 can generate enough working power, and the distance between the coil and the central position will not be too large. The farther you are, the more pronounced the weakening of the signal at the central location will be.

Claims (2)

1. A non-contact power supply device for a computer input device, suitable for supplying power to a receiving device, characterized in that the non-contact power supply device comprises: a housing defining a power supply zone; and A magnetic field generating device transmits at least two electromagnetic energies of different phases to the receiving device in a non-contact manner in the power supply area. 2. The contactless power supply device of a computer input device as claimed in claim 1, wherein the magnetic field generating device comprises: a drive circuit providing a plurality of oscillating signals with different phases; and A plurality of coils, at least two of which are overlapped so that the two overlapped coils form an overlapping area and two non-overlapping areas, and the coils are used to receive the oscillation signals of different phases. the

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