KR20060005243A - Power supplier for avoiding short circuit - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a power supply having a short circuit protection function.

2. The technical problem to be solved by the invention

According to the present invention, the external charging terminal and the internal terminal of the power supply are connected or disconnected according to an on / off state of a switch operated by a sensor (for example, a magnetoresistive sensor), thereby unintended external It is an object of the present invention to provide a power supply having a short circuit protection function to prevent short circuits and the problems (over current, heat generation, explosion, etc.) in advance.

3. Summary of Solution to Invention

The present invention provides a power supply having a short circuit protection function, comprising: sensing means for applying a voltage in response to sensing an external charging device; And switching means for connecting or disconnecting an external terminal and an internal terminal of the power supply according to the voltage application or the voltage non-application from the sensing means.

4. Important uses of the invention

The present invention is used in power supply and the like.

Power supply, charging device, short circuit protection, magnetoresistive sensor, wireless communication terminal, battery

Description

Power supply with short circuit protection {Power supplier for avoiding short circuit}             

1 is an explanatory diagram of a power supply and a charging device for a general wireless communication terminal,

2 is a perspective view of the power supply of FIG.

3 is a configuration diagram of an embodiment of a power supply having a short circuit protection function according to the present invention.

* Explanation of symbols for the main parts of the drawings

12, 31: charging device 32: magnetic material

13, 33: terminals 11, 34 of the charging device: power supply

22, 35: external charging terminal 21, 36: internal terminal

37: magnetoresistive sensor 38: switch

39: battery cell

The present invention relates to a power supply having a short circuit protection function, and more particularly, an on / off (on / off) of a switch in which an external charging terminal and an internal terminal of the power supply are operated by a sensor (for example, a magnetoresistive sensor). The present invention relates to a power supply having a short circuit protection function to prevent an unintentional external short circuit and its problems (over current, heat generation, explosion accident, etc.) by being connected or disconnected according to an off state.

In the present invention, a wireless communication terminal is a mobile communication terminal, a personal mobile communication terminal (PCS), a personal digital terminal (PDA), a smart phone, a next generation mobile communication terminal (IMT-2000), a wireless communication while being carried by an individual such as a wireless LAN terminal. Say this is possible terminal.

In general, a sensor is a device that detects a physical quantity or a chemical quantity from a measurement target and outputs a specific signal (mainly an electrical signal) so that a series of operations can be performed accordingly. When the sensor is classified according to a detection target, there are a wide variety of sensors such as an optical sensor, a temperature sensor, an electromagnetic sensor, and a thermal sensor. In particular, the electromagnetic sensor refers to a device for converting a magnetic field into a useful electric signal using an electromagnetic induction effect, a Hall effect, a magnetoresistance effect, and the like. Looking in more detail as follows.

That is, the magnetoresistive effect refers to a phenomenon in which the internal electrical resistance of the conductor or semiconductor changes (mainly increases) when the magnetic body (magnet) is brought close to the conductor (metal) or the semiconductor due to the influence of the magnetic field formed by the magnetic body. In addition, the magnetoresistive sensor (MR sensor) is one of electromagnetic sensors using the magnetoresistive effect, and refers to a sensor in which an internal electric resistance increases as the magnetic field formed by the magnetic body increases and thus a voltage is applied to the output terminal.

On the other hand, in the explosive increase in the number of users of mobile information devices such as wireless communication terminals, laptops, etc., portable power supply devices such as batteries have become an essential source of power for such mobile information devices. The user of the mobile information device can recharge the power supply several times by using the charging device. The power supply device is configured to be charged by applying a voltage as it is mounted in the charging device. With reference to Figures 1 and 2 described below will be described in more detail with respect to the portable power supply and its charging device.

1 is an explanatory view of a power supply and charging device for a general wireless communication terminal, Figure 2 is a perspective view of the power supply of FIG.

The power supply device 11 for the wireless communication terminal, that is, the battery, includes an external charging terminal 22 and an internal terminal 21, a case, a battery cell surrounded by the case, and a protection circuit.

Looking at this in more detail, the battery 11 has an internal terminal 21 (discharge terminal) located at a portion of the battery 11 that is in contact with a terminal of a wireless communication terminal, and the internal terminal of both surfaces of the battery 11. The opposite of the 21, that is, the external charging terminal 22 which is in contact with the terminal 13 of the charging device (charger) 12 during charging, the case for wrapping the battery 11, is located inside the case It includes a battery cell which is a protection circuit and the battery itself to prevent overcharge and overcurrent. Here, the internal terminal 21 and the external charging terminal 22 are always maintained in a connected state so that the battery 11 immediately in the charging device 12 as the battery 11 is mounted in the charging device 12. The furnace voltage is configured to be applied.

That is, as the battery 11 is mounted in the charging device 12, the external charging terminal 22 of the battery 11 is connected to the terminal 13 of the charging device 12, and accordingly, the charging device Charging of the battery 11 that was discharged while voltage is applied from the battery 12 to the battery 11 is performed.

On the other hand, as the battery 11 is mounted in the wireless communication terminal, the internal terminal 21 of the battery 11 is connected to the terminal of the wireless communication terminal, and thus the voltage from the battery 11 to the wireless communication terminal. Is applied. In particular, the external charging terminal 22 has a feature that the battery 11 is always exposed to the outside in a state where the battery 11 is mounted in the wireless communication terminal.

Recently, Li-ion batteries have been widely used as power supply devices for mobile information devices such as wireless communication terminals and laptop computers. The lithium ion battery has a merit that it can be used while charging and discharging at any time using a charging device rather than a full discharge / full charge because there is no memory effect unlike a nickel (Ni) -based battery.

On the other hand, the lithium ion battery has a problem that there is a risk of explosion when the high temperature of 150 degrees or more or the charging terminal attached to the battery pack contacts a metallic material (for example, a coin). In addition, when the organic electrolyte flows out of the battery cell due to damage to the charging terminal or the battery, there is a risk of explosion.

For example, an external charging terminal and a case of a terminal lithium ion battery are damaged by an external shock, so that an organic electrolyte of a battery cell surrounded by the case flows to the outside and an overcurrent flows, thereby causing a fire to the terminal. In particular, since the external charging terminal is always exposed to the outside when the battery is mounted on the wireless communication terminal, the probability that the external charging terminal is damaged and exploded by an external shock is relatively higher than the probability of exploding in another state. It can be easily expected.

This may be a problem because the charging terminal (ie, the external charging terminal) exposed to the outside of the lithium ion battery is always connected with the internal terminal connected to the terminal of the terminal.

Therefore, the external charging terminal is normally disconnected from the internal terminal and can be switched to the connected state only when charging, thereby preventing external short-circuit (short circuit due to external impact) and the resulting overcurrent, heat generation, explosion, and the like. There is an urgent need for technology that can prevent this.

The present invention has been proposed to meet the above requirements, and the external charging terminal and the internal terminal of the power supply are connected according to the on / off state of the switch operated by a sensor (for example, a magnetoresistive sensor). It is an object of the present invention to provide a power supply having a short circuit protection function to prevent an unintentional external short circuit and its problems (over current, heat generation, explosion accident, etc.) by being prevented or blocked.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. In addition, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

An apparatus of the present invention for achieving the above object, the power supply having a short circuit protection function, the sensing means for applying a voltage in response to sensing the external charging device; And switching means for connecting or disconnecting an external terminal and an internal terminal of the power supply according to the voltage application or the voltage non-application from the sensing means.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.                     

First, prior to the detailed description of the present invention it will be clear that the magnetoresistive sensor used to detect the magnetic field among various types of sensors as an example. In addition, a power supply device and a charging device of a wireless communication terminal, which are representative of mobile information devices, will be described as an example.

3 is a configuration diagram of an embodiment of a power supply having a short circuit protection function according to the present invention. Here, the power supply device according to the present invention, as well as the charging device will be described in order to make it easier to understand.

As shown in FIG. 3, the power supply device 34 having a short circuit protection function according to the present invention may include a terminal of the charging device 31 as the power supply device 34 is mounted to the charging device 31. External charging terminal 35 connected to 33, the power supply device 34 is mounted on the wireless communication terminal, the internal terminal 36 to be connected to the terminal of the wireless communication terminal, the charging device 31 A sensing unit 37 for applying a voltage in response to detecting the magnetic field from the attached magnetic body 32, and an on state in the usual off state as the voltage is applied from the sensing unit 37 And a switch 38 for switching the external charging terminal 35 and the internal terminal 36 to be in a connected state, and a battery cell 39.

In addition, the charging device 31 to which the present invention is applied includes a magnetic body 32, that is, a magnet. Here, the magnetic body 32 of the sensing unit 37 can be easily detected by the sensing unit 37 of the power supply device 34 when the wireless communication terminal is mounted on the charging device 31. It is attached considering the position.                     

That is, the external charging terminal 35 and the internal terminal 36 include respective positive (+) and negative (-) terminals. In addition, the external charging terminal 35 and the internal terminal 36 maintain a normally disconnected state, and as the switch 38 positioned between the two terminals 35 and 36 is turned on. The connection state is changed.

In addition, the sensing unit 37 of the power supply device 34 is connected to the plus terminal of the internal terminal 36 to receive a voltage required for driving. In particular, the sensing unit 37 detects the magnetic field formed by the magnetic body 32 of the charging device 31 (ie, recognizes that the power supply device 34 is mounted on the charging device 31). ), A voltage is applied to the output terminal to control the operation of the switch 38. Here, the sensing unit 37 may include a magnetoresistive sensor.

In addition, the switch 38 is positioned between the external charging terminal 35 and the internal terminal 36 to connect or disconnect the two terminals 35 and 36. That is, the switch 38 is switched from the usual off state to the on state as the voltage is received from the sensing unit 37 so that the two terminals 35 and 36 are connected in the disconnected state. Allows transition to state

In particular, the sensing unit 37 and the switch 38 may be implemented in the protection circuit of the power supply device 34.

The battery cell 39 is always connected to the internal terminal 36 as a battery itself. In addition, the battery cell 39 is connected to the terminal of the wireless communication terminal as the power supply device 34 is mounted on the wireless communication terminal so that a voltage is applied to the wireless communication terminal.

The present invention as described above, by allowing the external charging terminal and the internal terminal of the power supply can be connected to each other only when charging, there is an effect that can prevent the external short circuit in advance. That is, even if the external charging terminal is damaged, it is possible to prevent damage to the internal terminal and the battery cell which is always connected to the internal terminal, thereby preventing the short circuit caused by the external shock.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention as described above, the external charging terminal and the internal terminal of the power supply is intended to be connected or disconnected according to the on / off (on / off) state of the switch operated by the sensor (for example, magnetoresistance sensor), External short-circuit and related problems (overcurrent, heat generation, explosion accident, etc.) can be prevented in advance.

That is, according to the present invention, the external charging terminal exposed to the outside is normally cut off with the internal terminal of the wireless communication terminal, thereby preventing overcurrent, heat generation, explosion, etc., even in case of unintentional external shock. It works.

Claims (3)

A power supply having a short circuit protection function, Sensing means for applying a voltage according to sensing an external charging device; And Switching means for connecting or disconnecting the external terminal and the internal terminal of the power supply according to the voltage applied or the voltage non-applied from the sensing means Power supply having a short circuit prevention function comprising a. The method of claim 1, The sensing means, Power supply having a short circuit protection, characterized in that it comprises a magnetoresistance sensor. The method according to claim 1 or 2, The sensing means, And a voltage is applied to the switching means in response to detecting a magnetic field from a magnetic body attached to the external charging device.

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