TWM455915U - Composite transformer and non contacting battery charging device using the same - Google Patents

Description

Combined transformer and non-contact electricity using the combined transformer Pool charging device

The present invention relates to a transformer, and more particularly to a combined transformer and a non-contact battery charging device using the combined transformer.

A disposable battery that is typically installed in a stylus to supply power is designed to be used once and lost. Therefore, such a stylus must frequently replace the battery, resulting in inconvenience in use. Moreover, the frequent need for battery replacement leads to additional cost and environmental issues.

Conventionally, a battery charger for charging a stylus is typically inserted into a jack connector provided to the stylus using a plug connector to establish an electrical connection during charging. Each of the plug connector and the jack connector has an exposed electrical contact point that is susceptible to oxidation. The plug connector may be deformed by a collision. Therefore, deterioration of the plug connector may cause a poor electrical connection between the plug connector and the jack connector.

Therefore, the aforementioned technology still has room for improvement.

Accordingly, it is an object of the present invention to provide a non-contact battery charging apparatus using a combined transformer that overcomes the above-described deficiencies of the prior art.

According to an aspect of the present invention, a combined transformer suitable for charging a stylus in a battery charging device is provided. The novel combined transformer comprises a tubular insulated wire tube, a primary winding, a long magnetic core and a secondary winding.

A tubular insulated conduit allows the stylus to penetrate through itself. The primary winding is wound directly onto the tubular insulated conduit. The magnetic core is adapted to be coaxially fixed in the stylus. When the stylus is extended to be charged via the tubular insulated conduit, a portion of the magnetic core is coaxially disposed in the tubular insulated conduit such that the primary winding is coaxially disposed around the portion of the core. The secondary winding is adapted to be disposed in the stylus and wound directly onto the magnetic core. The secondary winding is coaxial with the primary winding when the stylus extends through the tubular insulated conduit.

According to another aspect of the present invention, a non-contact battery charging device for charging a stylus is provided. The novel non-contact battery charging device comprises a socket, a combined transformer, a frequency signal generator and a charger.

The pen holder has a socket for receiving the stylus. The socket has an opening that allows the stylus to be inserted through the socket.

The combined transformer includes a tubular insulated conduit, a primary winding, a long core, and a secondary winding. The tubular insulated wire tube is fixed It is placed in the socket of the pen holder and allows the stylus to penetrate through itself. The primary winding is wound directly onto the tubular insulated conduit. The magnetic core is adapted to be coaxially secured in the stylus. When the stylus is inserted into the socket of the pen holder via the opening and is to be charged via the tubular insulated wire tube, a part of the magnetic core is coaxially located on the tubular insulated wire tube, so that the primary winding is coaxial Set the core around the part. The secondary winding is adapted to be disposed in the stylus and wound directly onto the magnetic core. The secondary winding is coaxial with the primary winding when the stylus extends through the tubular insulated conduit.

A frequency signal generator is disposed in the pen holder for generating a high frequency voltage signal and applying the high frequency voltage signal to a primary winding of the combined transformer.

A charger is adapted to be disposed in the stylus and has a combination of the magnetic core and a secondary winding of the combined transformer. The charger is operable to supply a charging voltage to the rechargeable battery of the stylus based on an input voltage across a primary winding of the modular transformer.

When the stylus is inserted into the socket of the pen holder to be charged, the charger converts an output voltage induced by the secondary winding of the combined transformer by electromagnetic induction under high frequency oscillation into the Charging voltage.

10‧‧‧ charging stand

11‧‧‧ pen seat

111‧‧‧Opening

112‧‧‧ socket

12‧‧‧ Frequency signal generator

13‧‧‧Insulated wire tube

20‧‧‧Charger

21‧‧‧Rectifier filter circuit

22‧‧‧Charging circuit

300‧‧‧ tablet

30‧‧‧ computer case

32‧‧‧ accommodating slot

40‧‧‧ stylus

41‧‧‧ pen

411‧‧‧ writing end

412‧‧‧Insert

42‧‧‧Rechargeable battery

C‧‧‧ magnetic core

T‧‧‧Combined transformer

Wp‧‧‧First winding

Ws‧‧‧ secondary winding

Other features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the drawings. FIG. 1 is a perspective view showing a non-contact battery for charging a stylus. a first preferred embodiment of a charging device; Figure 2 is a schematic block diagram showing a first preferred embodiment; Figure 3 is an incomplete partial cross-sectional schematic view showing the combined transformer of the first preferred embodiment in a non-combined state; Figure 4 is An incomplete cross-sectional overview view illustrating the combined transformer of the first preferred embodiment in a combined state; FIG. 5 is a schematic view showing the non-contact battery charging device of the present invention for charging a stylus A second preferred embodiment; and Figure 6 is a schematic view showing a variation of the second preferred embodiment.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 1 to FIG. 4, a first preferred embodiment of the non-contact battery charging device for charging a stylus pen 40 includes a socket 11, a combined transformer T, a frequency signal generator 12 and a Charger 20. The stylus pen 40 includes a pendulum 41 and a rechargeable battery 42 mounted to the pen tip 41. In the present embodiment, the pen holder 41 has a writing end 411 opposite to the tapered insertion end 412 of the writing end 411.

The pen holder 11 has a socket 112 for receiving the stylus pen 40. In this example, the socket 112 has an upper opening 111 that allows only the insertion end 412 of the barrel 41 of the stylus 40 to be inserted into the socket 112 (see FIG. 3). Thus, the stylus pen 40 can be positioned by the upper opening 111 and supported by the pen holder 11 (see Fig. 4).

The combined transformer T includes a tubular insulated wire tube 13, a primary winding Wp, a long magnetic core C, and a secondary winding Ws.

The insulated wire tube 13 is made of plastic and is fixed in the socket 112 of the pen holder 11. The insulated conduit 13 allows the insertion end 412 of the sheath 41 of the stylus 40 to penetrate through itself.

The primary winding Wp is wound directly onto the insulated wire tube 13.

The magnetic core C is adapted to be coaxially fixed in the pen holder 41 of the stylus pen 40. When the insertion end 412 of the pen holder 41 of the stylus pen 40 is inserted into the socket 112 of the pen holder 11 via the upper opening 111 and is to be charged through the insulated wire tube 13, a part of the magnetic core C is coaxially located in the insulated wire tube 13, The primary winding Wp is coaxially disposed around the partial core C. In the present embodiment, in order to achieve the maximum magnetic excitation effect, the entire magnetic core C is coaxially disposed in the insertion end 412 (see FIG. 3) of the sheath 41 of the stylus pen 40, so that when the stylus pen 40 is inserted into the pen holder 11 When it is to be charged (see Fig. 4), the primary winding Wp is coaxially disposed around the entire core C.

The secondary winding Ws is adapted to be disposed in the sheath 41 of the stylus pen 40 and wound directly onto the magnetic core C. When the insertion end 412 of the sheath 41 of the stylus pen 40 penetrates the insulated wire tube 13, the secondary winding Ws is coaxial with the primary winding Wp. When the stylus pen 40 is separated from the pen holder 11, the combined transformer T is in a non-combined state.

When the stylus pen 40 is inserted into the pen holder 11 to be charged, the combined transformer T is in a combined state. When the combined transformer T is in a combined state, the combined transformer T can convert energy by inductive coupling between the primary winding Wp and the secondary winding Ws. The varying current of the primary winding Wp produces a varying magnetic flux of the magnetic core C and thus a varying magnetic flux through the secondary winding Ws. This varying magnetic flux induces a change in electromotive force (EMF) of the secondary winding Ws or an output voltage Vs across the secondary winding Ws. This effect is called inductive coupling. The output voltage Vs induced across the secondary winding Ws can be obtained from Faraday's law of induction, which reads:

Where Vs is the instantaneous voltage, Ns is the number of turns of the secondary winding Ws, and Φ is the magnetic flux passing through the secondary winding Ws. If the coil turns perpendicular to the magnetic field lines, the flux is the product of the magnetic flux density and the area through which it passes. This area is constant, equal to the cross-sectional area of the core C, and the magnetic field changes with time according to the excitation of the primary winding Wp. Ideally, the same magnetic flux passes through the primary winding Wp and the secondary winding Ws. Therefore, the instantaneous input voltage Vp across the primary winding Wp can be expressed by the following program:

Taking the ratio of equations (1) and (2) of Vs and Vp gives the following equation:

The frequency signal generator 12 is disposed in the pen holder 11 for generating a high frequency voltage signal, which is one of a sine wave signal and a square wave signal. The frequency signal generator 12 is coupled to the primary winding Wp for applying a high frequency voltage signal to the primary winding Wp.

Note that the pen holder 11 cooperates with the combination of the insulated wire tube 13 and the primary winding Wp and the frequency signal generator 12 to constitute a charging stand 10.

The charger 20 is adapted to be combined in a sheath 41 provided in the stylus pen 40 and having a magnetic core C and a secondary winding Ws. The charger 20 is operable to supply a charging voltage to the rechargeable battery 42 of the stylus 40 in accordance with an input voltage Vp across the primary winding Wp of the combined transformer T. When the stylus pen 40 is inserted into the socket 112 of the pen holder 11 to be charged, the charger 20 converts the output voltage Vs induced by the secondary winding Ws by electromagnetic induction under high frequency oscillation into the charging voltage. In the present embodiment, the charger 20 includes a rectifying and filtering circuit 21, and a charging circuit 22. The rectifying and filtering circuit 21 is coupled to the secondary winding Ws for rectifying and filtering the output voltage Vs across the secondary winding Ws to generate a DC voltage. The charging circuit 22 is coupled to the rectifying and filtering circuit 21 for converting the DC voltage from the rectifying and filtering circuit 21 into the charging voltage, and then supplying the charging voltage to the rechargeable battery 42 of the stylus pen 40.

In this configuration, the stylus pen 40 is easily charged by the novel non-contact battery charging device when inserted into the pen holder 11, thus resulting in convenience in use. Furthermore, the novel non-contact battery charging device utilizes electromagnetic induction without electrical contact points, thereby avoiding poor electrical conduction due to oxidation of electrical contact points.

FIG. 5 illustrates a second preferred embodiment of the non-contact battery charging device of the present invention for charging a stylus pen 40, which is a modification of the first preferred embodiment. In this embodiment, the charging stand is disposed in a portable computer, such as a tablet computer 300, for use with the stylus pen 40. tablet The 300 has a computer housing 30 that serves as a pen holder for the charging stand. The computer casing 30 has a bottom side formed with an upwardly extending receiving groove 32 which is disposed adjacent to one side and serves as a socket for the pen holder for accommodating the entire stylus pen 40. In the present embodiment, the combination of the primary winding Wp and the insulated bobbin 13 is fixed in the accommodating groove 32 and disposed adjacent to the top side of the computer case 30. Thus, when the stylus pen 40 is inserted into the accommodating groove 32 to be moved to a charging position, the combination of the magnetic core C and the secondary winding Ws is located in the insulated wire tube 13, and the writing end of the stylus pen 40 is written. Adjacent to the bottom side of the computer housing 30. In this case, the stylus pen 40 can then be charged.

Figure 6 illustrates a variation of the second preferred embodiment. The non-contact battery charging device of FIG. 6 is different from the non-contact battery charging device of FIG. 5 in that the combination of the primary winding Wp and the insulated conduit 13 is disposed adjacent to the bottom side of the computer housing 30. Then, when the stylus pen 40 is inserted into the accommodating groove 32 to move to the charging position, the writing end of the stylus pen 40 is adjacent to the top side of the computer case 30.

While the present invention has been described as being considered as the most practical and preferred embodiment, it is understood that the present invention is not limited to the disclosed embodiments, but is intended to cover Covers all such modifications and equivalent configurations.

10‧‧‧ charging stand

12‧‧‧ Frequency signal generator

20‧‧‧Charger

21‧‧‧Rectifier filter circuit

22‧‧‧Charging circuit

42‧‧‧Rechargeable battery

T‧‧‧Combined transformer

Wp‧‧‧First winding

Ws‧‧‧ secondary winding

Claims (11)

A combined transformer suitable for charging a stylus in a battery charging device, comprising: a tubular insulated conduit allowing the stylus to penetrate through itself; a primary winding wound directly onto the tubular insulated conduit a long magnetic core adapted to be coaxially fixed in the stylus, and when the stylus is charged via the tubular insulated conduit, a part of the magnetic core is coaxially located in the tubular insulated conduit Having the primary winding coaxially disposed around the portion of the magnetic core; and a secondary winding adapted to be disposed in the stylus and directly wound onto the magnetic core, the stylus extending through the tubular insulated conduit The secondary winding is coaxial with the primary winding. The modular transformer of claim 1, wherein the secondary winding is disposed to surround the partial core. The modular transformer of claim 1, wherein the tubular insulated conduit is made of plastic. A non-contact battery charging device for charging a stylus, comprising: a socket having a socket for accommodating the stylus, the socket having a socket for allowing the stylus to be inserted therein An open-type transformer, comprising: a tubular insulated conduit, fixed in the socket of the pen holder and allowing the stylus to penetrate through itself, a primary winding, directly wound onto the tubular insulated conduit a long magnetic core adapted to be coaxially fixed in the stylus, when the stylus is inserted into the socket of the pen holder via the opening and is charged through the tubular insulated conduit, part of The magnetic core is coaxially disposed in the tubular insulated conduit such that the primary winding is coaxially disposed around the partial core, and a secondary winding is adapted to be disposed in the stylus and directly wound to the magnetic a secondary winding is coaxial with the primary winding when the stylus extends through the tubular insulated conduit; a frequency signal generator is disposed in the pen holder for generating a high frequency voltage signal, and Applying the high frequency voltage signal to the primary winding of the combined transformer; and a charger adapted to be disposed in the stylus and having a combination of the magnetic core and a secondary winding of the combined transformer, the charging The device is operable to supply a charging voltage to the rechargeable battery of the stylus according to an input voltage across the primary winding of the combined transformer; wherein, when the stylus is inserted into the socket of the pen holder To be When charged, the charger will be used in an output voltage of the secondary winding of the high-frequency electromagnetic induction oscillation induced in the transformer into the modular charging voltage. The non-contact battery charging device of claim 4, wherein the tubular insulated conduit is made of plastic. The non-contact battery charging device of claim 4, wherein the high frequency voltage signal is one of a sine wave signal and a square wave signal. The non-contact battery charging device according to claim 4, wherein the second A winding is disposed around the portion of the core. The non-contact battery charging device of claim 4, wherein the charger comprises: a rectifying and filtering circuit coupled to the secondary winding of the combined transformer for rectifying an output voltage across the secondary winding And filtering to generate a DC voltage; and a charging circuit coupled to the rectifying filter circuit for converting a DC voltage from the rectifying and filtering circuit into the charging voltage and supplying the charging voltage to the stylus rechargeable battery. The non-contact battery charging device according to claim 4, wherein the pen holder cooperates with the combination of the tubular insulated conduit and the primary winding of the combined transformer and the frequency signal generator constitutes a charging stand. The non-contact battery charging device of claim 9, wherein the charging base is disposed in a portable computer device for use with the stylus. The non-contact battery charging device of claim 10, wherein the portable computer device is a tablet computer.