KR20060021035A - A self-charge apparatus for communication terminal - Google Patents

Abstract

The present invention relates to a self-charging device for a communication terminal capable of charging a battery by changing the pressure caused by a user's keypad operation using a piezoelectric element into electrical energy.

To this end, the present invention, in the self-charging device used in a communication terminal having a battery for supplying power, a keypad for inputting information and a printed circuit board that generates a signal while grounded by the pressure applied to the keypad, Charge generation means including at least one piezoelectric element for generating charge by the pressure applied to the keypad; Auxiliary charging means for storing charge generated by said charge generating means; And control means for charging the battery when the voltage of the auxiliary charging means is higher than the voltage of the battery by comparing the voltage caused by the charge charged in the auxiliary charging means with the voltage of the battery. It provides a self-charging device for a communication terminal comprising a.

According to the present invention, there is an effect that the battery can be charged without carrying a separate charging device.

Self charging, piezoelectric element, voltage comparison, battery, keypad

Description

Self-charging device for communication terminal {A Self-charge Apparatus for Communication Terminal}             

1 is a perspective view showing the configuration of a self-charging device for a communication terminal according to the present invention.

2 is a cross-sectional view showing an embodiment of a self-charging device for a communication terminal according to the present invention.

3 is a cross-sectional view showing another embodiment of a self-charging device for a communication terminal according to the present invention.

4 is a circuit diagram showing an embodiment of a circuit configuration of a self-charging device according to the present invention.

5 is a circuit diagram showing another embodiment of the circuit configuration of the self-charging device according to the present invention.

Explanation of symbols on the main parts of the drawings

110 ... keypad 120 ... printed circuit board

130 ... Metal Dome 150 ... Key Button

151 ... Contact projection 200 ... Self-charging device

210.Charge generating means 211 ... Piezoelectric element

220 ... Secondary charging means 221 ... Rectification means

222 capacitors 230 control means

233 ... Zener Diodes 240 ... Sheet

300 ... battery

The present invention relates to a self-charging device for a communication terminal capable of self-charging a battery for supplying power to a communication terminal such as a mobile phone, a PDA, a cellular phone, and more particularly, by a user's keypad operation using a piezoelectric element. The present invention relates to a self-charging device for a communication terminal capable of charging a battery by changing pressure into electrical energy.

In general, since the personal mobile communication service is implemented, portable communication terminals such as mobile phones, cellular phones, personal portable terminals, etc. are widely used, and these communication terminals are applied very closely to real life.

The communication terminal has a keypad for inputting numbers or letters. The keypad is installed in a casing in which a plurality of key button holes are formed, and a plurality of key buttons are formed upward in the key button holes, and at the bottom of the plurality of key buttons. A keypad rubber made of a silicon material having integrally formed contact protrusions is inserted and mounted downward, and a thin film is coated on the upper surface of the key button of the keypad rubber to prevent damage of the key button and the keypad rubber.

A printed circuit board formed in a predetermined pattern is mounted under the contact protrusion of the keypad rubber. A carbon dome and a metal dome for grounding the carbon contact are located at a position opposite to the contact protrusion of the keypad rubber on the upper surface of the printed circuit board. And a plurality of lamps mounted at predetermined positions between the keypad and the printed circuit board to be positioned in the lower casing.

When the key button of the keypad rubber of the portable wireless terminal installed as described above is press-fitted, the contact protrusion provided at the bottom of the key button presses the metal dome of the printed circuit board located at the bottom, thereby grounding the carbon contact of the printed circuit board and grounding the signal. It will be used to generate.

On the other hand, a variety of portable communication terminals are provided with a rechargeable battery pack for the call standby or power supply of the rated voltage required during the call, the battery pack according to the number of battery cells, the call waiting time or the call of the portable communication device The time is determined.

The battery pack includes a lithium ion battery cell, a hydrogen battery cell, a nickel-cadmium battery cell, and the like, and usually, a stable operating power is supplied only after charging for a predetermined time to a charger having an adapter.

However, a portable terminal equipped with such a general battery pack is unable to supply normal operating power to the communication terminal when the charge voltage of the battery cell is discharged below the rated voltage level, and thus it is impossible to transmit or receive the corresponding communication terminal. In addition, there is a problem that can not check the contents stored in the communication terminal. Moreover, when the charging voltage is lowered below the rated level during a call, there is a problem that the exchange of normal call messages is stopped.

In addition, when the portable communication terminal needs to be used for a long time, it is necessary to carry a spare battery, but in this case, there is a problem that there is a risk of inconvenience or loss of the portable.

Moreover, for people with high phone calls, frequent business trips, and those who have been away from their residences for a long time, they must carry a separate charger from the spare battery, which is heavy and very inconvenient to carry. There is a problem.

In order to solve the above problems, various types of battery self-charging devices have been proposed. For example, the self-charging storage battery disclosed in Korean Patent Registration No. 0244934 (registered on November 24, 1999) is a solar cell that is stored by sunlight. And a generator driven by the drive means, a controller for charging the battery with a uniform polarity irrespective of the polarity of the solar cell and the electricity produced by the generator, a battery to which power is supplied from the controller, and electricity of the battery. It is composed of an output stage coupled with a power supply terminal to be supplied to a portable electronic device to perform self-charging.

The above device has a problem that there are many components and cannot be miniaturized so that it cannot be embedded in a mobile phone, and sufficient power generation is not possible enough to charge only by the elasticity of the spring. In order to be able to charge such a device, the winding portion of the high power generator and the spring must be considerably large, and when the structure is bulky and cannot be built, there is a problem in that it is inconvenient to use like a conventional charger.

On the other hand, although the utility model registration No. 0225233 (registered on March 31, 2001) is disclosed as a device that can be charged with hand grip or energy obtained by stepping on it, such charging devices are inconvenient to carry, There is a problem that it takes a lot of power to drive.

The present invention is to solve the above problems, an object of the present invention is to provide a self-charging device for a communication terminal that can charge the battery without carrying a separate charging device.

In addition, even if the user does not separately charge the electrical energy is generated only by the normal use of the communication terminal, and collects this to provide a self-charging device for a communication terminal that the battery is automatically charged when the charge voltage of the battery is lowered. For the purpose of

In addition, an object of the present invention is to provide a self-charging device for a communication terminal capable of charging a battery with a small force during a charging operation.

The present invention to achieve the above object,

In a self-charging device used in a communication terminal having a battery for supplying power, a keypad for inputting information and a printed circuit board that generates a signal while grounded by the pressure applied to the keypad,

Charge generation means including at least one piezoelectric element for generating charge by the pressure applied to the keypad;

Auxiliary charging means electrically connected to the charge generating means and storing charge generated by the charge generating means; And

The battery is electrically connected to the auxiliary charging means and the battery, and the voltage of the auxiliary charging means is higher than the voltage of the battery by comparing the voltage caused by the charge charged in the auxiliary charging means with the voltage of the battery. Control means for charging;

It provides a self-charging device for a communication terminal comprising a.

Preferably, the piezoelectric element generates a charge by receiving pressure between the contact protrusion formed on the keypad or the bottom of the keypad and the metal dome provided on the printed circuit board when pressure is applied to the keypad.

Preferably, the auxiliary charging means includes a rectifying means for rectifying the current caused by the charge generated in the charge generating means and a capacitor for storing the current rectified in the rectifying means as a charge, the rectifying means and the capacitor It is connected in parallel with the charge generating means.

Also preferably, the control means may include a voltage comparison circuit for comparing the voltage due to the charge charged in the auxiliary charging means with the voltage of the battery, and when the voltage of the auxiliary charging means is higher than the voltage of the battery. And a switch for electrically connecting the auxiliary charging means and the battery to be charged.

The control unit may further include a zener diode configured to transfer charges from the auxiliary charging unit to the battery such that the battery is charged when the voltage caused by the charge charged in the auxiliary charging unit is higher than the voltage of the battery by a predetermined voltage. It is preferable to comprise.

More preferably, the self-charging device further includes a seat on which the charge generating means, the auxiliary charging means and the control means are mounted.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a perspective view showing the configuration of a self-charging device for a communication terminal according to the present invention, Figures 2 and 3 is a cross-sectional view showing an embodiment of a self-charging device.

As shown in FIG. 1, the communication terminal includes a battery 300 for supplying power, a keypad 110 for inputting information, and a printed circuit board 120 generating a signal while being grounded by pressure applied to the keypad. The self-charging device 200 for a communication terminal according to the present invention includes a charge generating means 210, an auxiliary charging means 220 and a control means 230.

As shown in FIGS. 1 to 3, the charge generating means 210 includes at least one piezoelectric element 211 that generates charge by the pressure applied to the keypad 110.

Here, the piezoelectric element refers to a device in which mechanical distortion due to external force occurs on a crystal having an asymmetric crystal structure, at the same time electric charges are induced on the surface of the crystal, and electrical polarization occurs, thereby generating a small charge. As a result, such a piezoelectric element can induce an adverse effect that mechanical distortion occurs simultaneously with generation of electric charge even when an electric field is applied to the crystal.

In other words, it refers to an element for mutual conversion of a mechanical quantity such as pressure or vibration and an electrical quantity such as voltage, by using a principle that charge is applied when a pressure is applied to a crystal or distortion is generated when an electric field is applied to the crystal.

By providing at least one piezoelectric element 211 below the keypad 110, it is possible to generate electricity by the pressure applied to the keypad 110.

The piezoelectric element 211 may be mounted under a specific key button 150 on the keypad 110, but each key button 150 may generate electricity by the manipulation force when the user operates the keypad 110. ) It can also be mounted on the bottom.

In this case, as shown in FIG. 1, a plurality of piezoelectric elements 211 are disposed at positions corresponding to the respective key buttons 150 and the piezoelectric elements 211 are mounted on one sheet 240 to improve assembly performance. It is desirable to.

On the other hand, as shown in Figure 2 the key button 150 in the lower portion of the printed circuit board 120, the metal dome 130 and the carbon contact 121 to make contact with the metal dome 130 so that the contact protrusion ( 151 is formed.

When the contact protrusion 151 is formed below the key button 150 as described above, it is preferable to position the piezoelectric element 211 between the contact protrusion 151 and the metal dome 130.

More preferably, as shown in FIG. 3, the piezoelectric element 211 may be used to perform the role of the contact protrusion 151. In this case, the piezoelectric element 211 is positioned directly below the keypad 110, and when pressure is applied to the keypad 110, the piezoelectric element 211 receives pressure between the keypad 110 and the metal dome 130 to charge. Will be generated.

4 and 5 are circuit diagrams showing one embodiment of a circuit diagram of the self-charging device 200 according to the present invention, respectively.

The auxiliary charging means 220 is electrically connected to the charge generating means 210, and functions to store the charge generated by the charge generating means 210, that is, each piezoelectric element 211.

As shown in FIG. 4, the auxiliary charging means 220 preferably includes a capacitor 222 for storing charge, and includes a rectifying means 221 for rectifying the current generated by the charge generating means 210. It may be further provided.

The rectifying means 221 and the capacitor 222 are preferably connected in parallel as shown in Figure 4 to perform rectification and charge storage.

Meanwhile, as shown in FIGS. 4 and 5, the control means 230 electrically connects the auxiliary charging means and the battery, and converts the voltage due to the charge charged in the auxiliary charging means 220 into the voltage of the battery 300. In comparison with the above, the auxiliary charging means 220 functions to charge the battery 300 when the voltage of the battery 300 is higher than that of the battery 300.

Preferably, as shown in Figure 4, the control means 230 is a voltage comparison circuit 231 and the auxiliary charging for comparing the voltage due to the charge charged in the auxiliary charging means 220 with the voltage of the battery 300 And a switch 232 electrically connecting the auxiliary charging means 230 and the battery 300 to charge the battery 300 when the voltage of the means 220 is higher than the voltage of the battery 300. Can be.

In addition, as shown in FIG. 5, the control means may use a zener diode 233. In the zener diode 233, a voltage due to charge charged in the auxiliary charging means is higher than a voltage of the battery by a predetermined voltage. In this case, the charge is transferred from the auxiliary charging means to the battery so that the battery is charged.

In addition, various known voltage comparison circuits may be applied to the present invention.

In addition, it is preferable to form the charge generating means 210, the auxiliary charging means 220 and the control means 230 on one sheet 240, as shown in Figure 1 for the improvement of the assembly, the charge generation A circuit (not shown) for electrically connecting the means 210, the auxiliary charging means 220, and the control means 230 is also formed on the sheet 240.

In this case, the seat 240 includes a connection member (not shown) such as a lead wire or a connection terminal such that the auxiliary charging means 220 and the control means 230 are connected to the battery.

The operation of the present invention having the configuration as described above is as follows.

As shown in FIG. 2 or 3, when the user presses each key button 150 to input information such as letters or numbers, the keypad 110 or the contact protrusion 151 under the key button is piezoelectric. The device 211 is pushed downward, whereby the metal dome 130 and the carbon contact 121 on the printed circuit board 120 is in contact with each other to generate a signal.

At this time, a pressure is applied to the piezoelectric element 211 disposed between the keypad 110 and the printed circuit board 120 to generate charge.

The electric charge generated in the piezoelectric element 211 is rectified by the rectifying means 221 shown in FIG. 4, stored in the capacitor 222, and the voltage of the capacitor 222 is increased.

At this time, the voltage comparison circuit 231 compares the voltages of the capacitor 222 and the battery 230 and determines that the voltage of the battery 230 is higher than the voltage of the capacitor 222 to close the switch 231 to close the battery. Charge 300.

As such, when the battery 300 is discharged and lower than the voltage of the capacitor 222, the battery 300 is automatically charged through the control means 230.

Therefore, even if the user does not charge separately, the electric energy is generated only by the normal use of the communication terminal, that is, the manipulation of the keypad 110, and the battery is automatically charged when the charging voltage of the battery 300 is lowered by storing it. There is an advantage.

In addition, even when the voltage of the capacitor 222 is less than the voltage of the battery because the amount of charge charged in the capacitor 222 is artificially applied to the keypad 110, charge is collected in the capacitor 222, the keypad By repeating the operation, there is an advantage that the self-charging of the battery 300 becomes possible.

On the other hand, in the case of using the zener diode 233 as shown in Figure 5, if the voltage of the capacitor 222 is higher than a certain value higher than the voltage of the battery 300, the charging of the battery is made, so the comparison and charging operation of the voltage It can be done.

In addition, there is an advantage that the power required to operate the keypad is small, so that the battery can be charged with a small force.

According to the present invention as described above, there is an effect that the battery can be charged without carrying a separate charging device.

In addition, even if the user does not charge separately, the electric energy is generated only by the normal use of the communication terminal, and the battery is automatically charged when the charging voltage of the battery is collected and lowered.

In addition, there is an effect that the battery can be charged with a small force.

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as set forth in the claims below. I want to make it clear.

Claims (8)

In a self-charging device used in a communication terminal having a battery for supplying power, a keypad for inputting information and a printed circuit board that generates a signal while grounded by the pressure applied to the keypad, Charge generation means including at least one piezoelectric element for generating charge by the pressure applied to the keypad; Auxiliary charging means electrically connected to the charge generating means and storing charge generated by the charge generating means; And The battery is electrically connected to the auxiliary charging means and the battery, and the voltage of the auxiliary charging means is higher than the voltage of the battery by comparing the voltage caused by the charge charged in the auxiliary charging means with the voltage of the battery. Control means for charging; Self-charging device for a communication terminal comprising a. The method of claim 1, The piezoelectric element is a self-charging device for a communication terminal, characterized in that when the pressure is applied to the keypad to generate a charge under pressure between the keypad and the metal dome provided on the upper surface of the printed circuit board. The method of claim 1, The piezoelectric element is a self-charging device for a communication terminal, characterized in that when the pressure is applied to the keypad receives a pressure between the contact projection formed on the bottom of the keypad and the metal dome provided on the upper surface of the printed circuit board. The method of claim 1, The auxiliary charging means includes a rectifying means for rectifying the current by the charge generated by the charge generating means and a capacitor for storing the current rectified by the rectifying means as a charge. The method of claim 4, wherein The rectifying means and the capacitor is a self-charging device for a communication terminal, characterized in that connected in parallel with the charge generating means. The method of claim 1, The control means may include a voltage comparison circuit for comparing the voltage due to the charge charged in the auxiliary charging means with the voltage of the battery and the auxiliary battery so that the battery is charged when the voltage of the auxiliary charging means is higher than the voltage of the battery. Self-charging device for a communication terminal comprising a switch for electrically connecting the charging means and the battery. The method of claim 1, The control means includes a zener diode for transferring charge from the auxiliary charging means to the battery so that the battery is charged when the voltage caused by the charge charged in the auxiliary charging means is higher than the voltage of the battery by a predetermined voltage. Self-charging device for a communication terminal, characterized in that made. The method of claim 1, A seat on which the charge generating means, the auxiliary charging means, and the control means are mounted; Self-charging device for a communication terminal further comprising a.

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