KR100721960B1 - Charge apparatus of second battery within electronic equipment utilized one of commercial alternating power source and dc power source of personal computer - Google Patents

Abstract

The present invention can be selectively connected to a USB socket or AC power line of a personal computer to charge a secondary battery (lithium ion battery or lithium polymer battery) built in the terminal, and connected to the USB socket of the personal computer. It detects the communication data signal of the USB cable data communication line to determine whether it is charging and at the same time, it can set the charging current, and it can be charged by reducing the charging current to prevent overheating when charging a bad battery or an over-discharge battery. (FOLD BACK) can be charged, and when the battery is not connected to the output terminal, the charging voltage and charging current can be cut off.

Commercial AC power supply, personal computer, DC power supply, terminal, secondary battery, charging device, charging method

Description

CHARGE APPARATUS OF SECOND BATTERY WITHIN ELECTRONIC EQUIPMENT UTILIZED ONE OF COMMERCIAL ALTERNATING POWER SOURCE AND DC POWER SOURCE OF PERSONAL COMPUTER}

1 is a perspective view schematically showing a charging device for a secondary battery built in a conventional mobile phone,

Figure 2 is a perspective view schematically showing a charging device of a secondary battery built in another conventional mobile phone,

3 is a block diagram specifically showing FIG.

4 is a perspective view schematically showing a personal computer and an AC power charging device according to an embodiment of the present invention;

5 is a perspective view illustrating a state in which a secondary battery mounted on a portable terminal is charged with a DC power output from a personal computer using a USB cable unit of a personal computer and an AC power charging device according to an embodiment of the present invention;

6 is a block diagram of the rectifying unit in FIG.

7 is a block diagram of the USB cable unit in FIG.

Figure 8 (a) is a DC input voltage graph, Figure 8 (b) is a graph indicating whether or not the secondary battery mounted on the portable terminal, Figure 8 (c) of the secondary battery is mounted and charged in the portable terminal A graph showing the charging voltage, FIG. 8 (d) is a graph showing the charging current according to the charging section.

<Explanation of symbols for the main parts of the drawings>

90: portable terminal 92: connector socket

100: rectification unit 101: plug

102: power cable 103: EMI filter

104: first full-wave rectifying means 105: isolation transformer

106: second full wave rectifying means 107: filter

108: USB socket 109: charging current detection means

110: photo coupler 111: pulse width modulation controller

120: USB cable unit 121: USB terminal

122: USB cable 123: Output terminal

124: detection means for mounting the secondary battery 125: input voltage detection means

126: temperature detection means 127: malfunction prevention means

128: communication data detection means 129: secondary battery charge state detection means

130: constant current / constant voltage detection means 131: switching means

132: charging state display means 200: personal computer

203: USB socket

The present invention relates to a charging device for a secondary battery embedded in a terminal using a commercial AC power supply and a direct current (DC) power supply of a personal computer. Particularly, the present invention relates to a USB socket or an AC power line of a personal computer. The rechargeable battery can be charged and connected to the USB side socket of the personal computer to detect the communication data signal of the data communication line of the USB cable to determine whether the battery is being charged, and when the battery is not connected to the output terminal. And a charging device for a secondary battery embedded in a terminal using a commercial AC power supply capable of blocking a charging current and a DC power supply of a personal computer.

BACKGROUND OF THE INVENTION As a charging device for a mobile phone which has been widely used in the past, it is disclosed in Japanese Patent Laid-Open No. 2000-201204 (published date; July 18, 2000).

The charging device for a mobile phone disclosed in Japanese Patent Laid-Open No. 2000-201204 discloses a charging method for a rechargeable battery built in a mobile phone, a digital camera, or a notebook computer (hereinafter referred to as an electronic product). The AC adapter 50 as shown in the figure was used.

The AC adapter 50 uses a plug 51 connected to an outlet 40 for supplying AC 100V or AC 220V and an AC 100V or AC 220V supplied by the power cable 52a via the plug 51. AC / DC converter 53 for stepping down to a constant level and stepping down to a DC voltage (for example, 5.0 Vdc) and a connector socket 46 of the cellular phone 45 connected to an end of the power cable 52b. It is composed of a connector plug 54 inserted into the.

The AC adapter 50 configured as described above has problems such as difficulty in miniaturization and weight reduction, and the AC adapter 50 is larger than the main body 45 of the cellular phone. Not only is there a problem such as inconvenience, there is a problem that can not be directly connected to the AC 100V or AC 220V power line to charge the secondary battery embedded in the electronic products using the AC 100V or AC 220V power.

In order to solve this problem, the U.S. data communication cable device disclosed in Korean Utility Model Publication No. 20-0284119 (published date: July 31, 2002) is a personal computer as shown in FIGS. 2 and 3. 70 or a USB connector 301 connected to a USB port of a notebook computer 80, an I / F connector 303 connected to a mobile phone (or mobile phone), and the I / F connector A cable unit 302 is connected between the unit 303 and the USB connector unit 301 and includes a communication line 302a and a charging line 302b.

In addition, the charging unit 304 of the I / F connector unit 303 may store the electrical energy of the computers 70 and 80 as electrical energy in the secondary battery of the mobile phone 60. A constant voltage-constant current control means 401 for changing the electrical energy of 80 into a power source suitable for the secondary battery used in the mobile phone 60, a manual charge control means 402 for manually controlling the charging action, Automatic charging control means 403 for automatically controlling the charging operation, and LED display means 404 for displaying the state of charge.

By the way, the UESB data communication cable device configured as described above exchanges data between the computer 70 and 80 and the mobile phone 60 by one cable by using the USB port of the computer 70 and 80, and also the mobile phone ( Since the secondary battery built in 60) can be charged, there is no need to carry a separate charging device or power supply device. However, the conventional USB communication cable device converts AC power into DC power. Since there is no conversion means, there is a problem in that the secondary battery built in the mobile phone 60 cannot be charged by being electrically connected to an AC 100V or AC 220V power source directly.

Accordingly, the present invention has been made to solve the various problems described above, and an object of the present invention is to selectively connect to a USB socket or an AC power line of a personal computer and to include a secondary battery (lithium ion battery or lithium) embedded in a terminal. The present invention provides a charging device for a secondary battery built in a terminal using a commercial AC power source capable of charging a polymer battery) and a DC power source of a personal computer.

Still another object of the present invention is connected to the USB side socket of a personal computer and detects the signal of the data communication line of the USB cable to determine whether it is charged or not, and at the same time, a commercial AC power supply and a DC power supply of the personal computer. It is to provide a charging device of a secondary battery built in the terminal using.

Still another object of the present invention is a terminal using a commercial AC power supply and a DC power supply of a personal computer capable of charging by reducing the charging current (FOLD BACK) to prevent overheating when charging a bad battery or an over-discharge battery. To provide a charging device of a secondary battery built in.

Still another object of the present invention is to provide a charging device for a secondary battery built in a terminal using a commercial AC power supply and a DC power supply of a personal computer that can cut off a charging voltage and a charging current when the battery is not connected to an output terminal. have.

In order to achieve the above object, the present invention provides a plug that is connected to an AC power supply outlet on one side integrally, the USB socket is electrically connected to the other side via a power cable, and the AC power is connected to a specific level. A rectifying unit rectified by a DC power supply and a USB terminal electrically connected to the USB socket of the rectifying unit and the USB socket of the personal computer are disposed. The USB terminal of the personal computer is electrically connected to the USB socket of the personal computer to enable data communication. And a USB cable unit including an output terminal disposed on the other side via a USB cable from the USB terminal so as to charge the secondary battery built in the terminal and electrically connected to the connector socket of the portable terminal.

Hereinafter, a charging device for a secondary battery built in a terminal using a commercial AC power source and a DC power source of a personal computer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a perspective view schematically showing a personal computer and AC power charging device according to an embodiment of the present invention, Figure 5 is a USB cable unit of a personal computer and AC power charging device according to an embodiment of the present invention Is a perspective view illustrating a state of charging a secondary battery mounted on a portable terminal using a DC power output from a personal computer, FIG. 6 is a block diagram of a rectifying unit in FIG. 4, and FIG. 7 is a USB cable unit in FIG. 4. 8 (a) is a DC input voltage graph, FIG. 8 (b) is a graph indicating whether a secondary battery is mounted in the portable terminal, and FIG. 8 (c) is mounted in the portable terminal. FIG. 8 (d) is a graph showing charging current according to a charging section. FIG.

As shown in FIGS. 4 to 8, the personal computer and the AC power charging device according to an embodiment of the present invention have a plug 101 connected to an AC power supply outlet (not shown) on one side. The rectifying unit 100 is disposed to be electrically connected to the USB socket 108 via the power cable 102 on the other side, and rectifies AC power to a DC power of a specific level. A USB terminal 121 that is electrically connected to the USB socket 108 and the USB socket 203 of the personal computer 200 is disposed, and is electrically connected to the USB socket 203 of the personal computer 200 to communicate with the data. At the same time as the data communication is possible through (l1), the USB cable 122 from the USB terminal 121 is charged to charge the secondary battery built in the portable terminal 90 (for example, a mobile phone or a digital camera). Exposed to the other side through It consists of the USB cable unit 120, an output terminal 123 electrically connected to the connector socket 92 of the portable terminal 90. The

As shown in FIG. 6, the rectifying unit 100 filters the noise included in the AC power input through the plug 101, and the noise is filtered by the EMI filter 103. A first full-wave rectifying means 104 for receiving full-wave rectified AC power, an isolation transformer 105 for receiving a full-wave rectified AC power in the first full-wave rectifying means 104 and dropping it to a low voltage at a specific level; A second full-wave rectifying means 106 for receiving the DC voltage dropped to a low voltage of a specific level from the isolation transformer 105 and rectifying and smoothing the secondary voltage to a DC level of a specific level (for example, DC 5V); A filter 107 for filtering the noise included in the DC voltage secondary rectified and smoothed by the second full-wave rectifying means 106 to a specific level of DC voltage; and a filter of the specific level from which the noise is filtered by the filter 107. DC voltage to USB cable A USB socket 108 output to the USB terminal 121 of the unit 120, charging current detecting means 109 for detecting a charging current from which noise is filtered by the filter 107, and the charging current detecting means ( The photo coupler 110 which insulates the charging current detected by 109 and the charging current signal outputted from the photo coupler 110 and receives the charging current signal and reduces the pulse width of the charging current in the case of overcurrent above a certain level. The pulse width modulation controller 111 receives the charging current signal output from the photo coupler 110 and increases the pulse width of the charging current and outputs the pulse width modulation controller 111 to the isolation transformer 105 when the current is below a specific level.

As illustrated in FIG. 7, the USB cable unit 120 has a data communication line l1 and a portable terminal 90 such that the personal computer 200 and the portable terminal 90 are electrically connected to enable data communication. USB cable 122 having a power supply line (L2) to charge the secondary battery built in, and is fixedly installed on the output side of the USB cable 122 and the connector socket 92 of the portable terminal 90 and An output terminal 123 electrically connected to the input terminal of the USB cable 122 and fixedly connected to the USB socket 108 of the rectifying unit 100 or the USB socket 203 of the personal computer 200. The USB terminal 121 connected to the USB terminal 121 and the USB terminal 121 fixedly installed at the input side of the USB cable 122 are connected to the USB socket 203 of the personal computer 200 or the USB socket of the rectifying unit 100 ( 108 is electrically connected to the output terminal 123 and the portable The secondary battery mounting detecting means 124 for detecting whether the connector socket 92 of the terminal 90 for electrical connection is electrically connected to the output terminal 123 of the USB cable unit 120 and the portable terminal ( The DC power source introduced through the power supply line l2 of the USB cable 122 when the secondary battery mounting detecting means 124 detects that the connector socket 92 of the 90 is electrically connected. Input voltage detecting means 125 for detecting whether there is an abnormality, and temperature detecting means for detecting the temperature of the secondary battery of the portable terminal 90 mounted on the output terminal 123 of the USB cable unit 120 ( 126 and 2 of the portable terminal 90 when the input power detected by the input voltage detecting means 125 is not abnormal and the temperature detected by the temperature detecting means 126 is not abnormal. Output charging power (current and voltage) to charge the battery At the same time, when there is an error in the input power detected by the input voltage detecting means 125, the first error signal outputted from the input voltage detecting means 125 or the temperature detecting means 126 detected. When the temperature is abnormal, the output of the charging power source (current and voltage) is received to prevent charging of the secondary battery mounted in the portable terminal 90 by receiving the second error signal output from the temperature detecting means 126. Communication data detection for detecting whether or not the personal computer 200 and the portable terminal 90 are in data communication via the malfunction preventing means 127 for blocking and the data communication line l1 of the USB cable 122. Secondary battery charge state detection means 129 for detecting a state of charge charged in the means 128 and the secondary battery of the portable terminal 90 mounted on the output terminal 123 of the USB cable unit 120. And said secondary battery communication day Communication data detected by the data detection means 128 is in a state where data is communicated between the personal computer 200 and the portable terminal 90, and is charged with a USB mode charging current, and the personal computer 200 and the portable device are charged. When the terminal 90 is not in data communication, the output terminal 123 of the USB cable unit 120 is connected to the USB socket 108 of the rectifying unit 100 so that the USB is rapidly charged. Charges the secondary battery of the portable terminal 90 mounted on the output terminal 123 of the cable unit 120, and the output terminal of the USB cable unit 120 by the secondary battery state of charge detection means (129) Constant current / constant voltage detecting means 130 for detecting a constant current / constant voltage for controlling to charge with a low current when the secondary battery of the portable terminal 90 mounted in the 123 is in an over discharge state, and the USB cable unit 120 Mounted on the output terminal 123 of Switching means 131 for controlling the output of the constant current or the constant voltage detected by the constant current / constant voltage detecting means 130 to charge the secondary battery of the surrogate terminal 90, and the charging current output from the malfunction preventing means 127 Alternatively, the terminal receives the charging voltage, receives the constant current or the constant voltage output from the constant current or the constant voltage detecting means 130, and receives the constant current or the constant voltage output from the switching means 131 to output the terminal of the USB cable unit 120. And a state of charge display means 132 for displaying the state of charge of the secondary battery of the portable terminal 90 mounted at 123.

Next, the operation and effect of the charging device of the secondary battery built in the terminal using the commercial AC power supply and the DC power supply of the personal computer according to one embodiment of the present invention configured as described above will be described.

First, the USB terminal 121 of the USB cable unit 120 is inserted into the USB socket 108 of the rectifying unit 100, and the plug 101 of the rectifying unit 100 is not alternating current 100V or A method of charging the secondary battery mounted on the portable terminal 90 by rectifying the AC power supply by connecting to AC 220V will be described.

First, the output terminal 123 of the USB cable unit 120 is inserted into the connector socket 92 of the portable terminal 90 to output the output terminal 123 of the USB cable unit 120 and the portable terminal 90. After the connector socket 92 is electrically connected, the USB terminal 121 of the USB cable unit 120 is inserted into the USB socket 108 of the rectifying unit 100, and the plug of the rectifying unit 100 101) to an AC 100V or AC 220V outlet (not shown).

At this time, the noise contained in the AC power (AC100V or AC220V) input through the plug 101 of the rectifying unit 100 is filtered by the EMI filter 103, the noise from the EMI filter 103 The filtered AC power is received by the first full-wave rectifying means 104 and full-wave rectified and output to the isolation transformer 105.

The isolation transformer 105 receives a direct current rectified by the first full wave rectifying means 104 and drops first to a low voltage of a specific level, and a low level of the specific level first dropped from the isolation transformer 105. DC voltage is received by the second full-wave rectifying means 106, for example, rectified by a DC 5V voltage and smoothed, and rectified and smoothed by the second full-wave rectifying means 106 at a specific level of DC voltage. The noise included in the voltage is filtered by the filter 107.

The DC voltage of a specific level from which the noise is filtered by the filter 107 is applied from the USB socket 108 of the rectifying unit 100 to the USB terminal 121 of the USB cable unit 120.

In addition, the photocurrent coupler 110 detects the DC current (current flowing through the USB terminal 121 of the USB cable unit 120) of the specific level from which the noise is filtered by the filter 107 by the charging current detecting means 109. ) And the photo coupler 110 is switched on by the charging current output from the charging current detecting means 109 to provide insulation feedback to the pulse width modulation controller 111.

The pulse width modulation controller 111 receives the charging current signal output from the photo coupler 110 and reduces the pulse width of the charging current in the case of overcurrent above a certain level, and charge current signal output from the photo coupler 110. When the current is below a certain level, the pulse width of the charging current is increased to be output to the isolation transformer 105 to change the output time of the low voltage of the specific level which is first dropped by the isolation transformer 105. The size of the charging power output to the second rectifying means 106 (for example, 4.5Vdc to 6.0Vdc; see a in FIG. 8 (a)) to change the USB of the filter 107 and the rectifying unit 100. Output to the USB terminal 121 of the USB cable unit 120 through the socket 108.

At this time, the secondary battery mounting detecting means 124 detects whether the output terminal 123 of the USB cable unit 120 and the connector socket 92 of the portable terminal 90 are electrically connected. When the output terminal 123 of the USB cable unit 120 and the connector socket 92 of the portable terminal 90 are electrically connected (b of FIG. 8 (b) (output of the USB cable unit 120) When the terminal 123 is mounted on the portable terminal, a high level voltage is detected. When the terminal 123 is not mounted on the portable terminal, the low level voltage is detected. Can be determined whether the secondary battery is mounted or not).) The secondary battery mounting detecting means 124 outputs a switching control signal to the switching means 131 to switch the switching means 131 on, that is, conduction. Maintain state.

The communication data detecting means 128 detects whether or not the portable terminal 90 and the personal computer 200 perform data communication through the data communication line l1 of the USB cable 122. A state in which the 200 and the portable terminal 90 are not in data communication, that is, the USB terminal 121 of the USB cable unit 120 is electrically connected to the USB socket 203 of the personal computer 200. Since it is not in the state, the communication data detecting means 128 does not output an output signal indicating that data is being communicated to the constant current / constant voltage detecting means 130.

At the same time, the input voltage detecting means 125 and the malfunction preventing means 127 are connected to the input voltage detecting means 125 and the malfunction preventing means 127 through the USB socket 108 of the rectifying unit 100 (a in FIG. 8 (a), where a is Since 4.5Vdc to 6.0Vdc is applied, the input voltage (4.5Vdc to 6.0Vdc) detected by the input voltage detecting means 125 is not abnormal and the portable unit detected by the temperature detecting means 126 is not abnormal. When the temperature of the secondary battery mounted on the terminal 90 is not abnormal, the malfunction prevention means 127 charges the secondary battery of the portable terminal 90 to a predetermined level of DC power, that is, the rectifying unit 100. The DC power for charging output from the USB socket 108 of the output as it is to the constant current / constant voltage detection means 130.

Accordingly, the USB terminal 121 of the USB cable unit 120 is connected to the USB socket 108 of the rectifying unit 100, so that the switching means 131 in the constant current / constant voltage detecting means 130 is connected. Since the fast charging current (see g of FIG. 8 (d)) is output to the secondary battery of the portable terminal 90 connected to the output terminal 123 of the USB cable unit 120. In Fig. 8 (c), c is a charging voltage charged in the secondary battery mounted on the portable terminal 90 with the charging current f in the low current charging section, and d is a rapid speed in the current mode charging section. Charging current (g) is the charging voltage charged in the secondary battery mounted on the portable terminal 90, d 'is the charging current (h) in the voltage mode charging section is mounted on the portable terminal 90 The charging voltage charged in the secondary battery, and e is the charging voltage charged in the secondary battery mounted on the portable terminal 90 by the charging current i in the voltage mode charging section.

In addition, the state of charge of the secondary battery of the portable terminal 90 mounted on the output terminal 123 of the USB cable unit 120 is detected by the secondary battery state of charge detecting means 129. When the secondary battery mounted on the portable terminal 90 is defective or in an over-discharge state, the secondary battery mounted on the portable terminal 90 is charged with a minute current f in the low current charging section in FIG. 8 (d). After the charged voltage of the secondary battery mounted on the portable terminal 90 becomes 2.5Vdc and rapidly charges with the charging current (see g of FIG. 8 (d)) in the current mode charging section, and the portable terminal 90 When the charging voltage of the secondary battery, which is attached to the secondary battery, reaches 4.2 Vdc, the battery is charged while gradually decreasing the charging current in voltage mode (see h of FIG. 8 d), and the charging current after point i of FIG. 8 (d). When the time reaches 1/10 of the charging current (see g of FIG. Accordingly, it is possible to prevent the secondary battery mounted on the portable terminal 90 from being overheated.

In the above description, the state of charge charged in the secondary battery of the portable terminal 90 mounted on the output terminal 123 of the USB cable unit 120 is determined by the secondary battery state of charge detecting means 129. When the secondary battery mounted on the portable terminal 90 is not defective or in an over-discharge state, the rapid charging current (g of FIG. 8 (d) in the current mode charging section of FIG. 8 (d) is detected. 800 to 1000 mA)).

As described above, when the secondary battery mounted on the portable terminal 90 is in a fully charged state, the constant current / constant voltage output from the constant current / constant voltage detecting means 130 is received and the charge output from the switching means 131 is received. The charging state display means 132, ie, the dual light emitting diode, emits green light in response to a current, indicating that the secondary battery mounted in the portable terminal 90 is in a fully charged state.

When the battery is not in a fully charged state, that is, when the secondary battery mounted in the portable terminal 90 is not in a fully charged state, the constant current / constant voltage output from the constant current / constant voltage detecting means 130 is received, and the In response to the charging current output from the switching means, the charging state display means 132, ie, the dual light emitting diode, emits red light, indicating that the secondary battery mounted in the portable terminal 90 is being charged.

On the other hand, when the input power detected by the input voltage detecting means 125 is abnormal, the input voltage detecting means 125 outputs a first error signal to the malfunction preventing means 127, and the temperature When the temperature of the secondary battery mounted on the portable terminal 90 detected by the detecting means 126 is abnormal (overheating), the temperature detecting means 126 passes from the malfunction preventing means 127. Since the second error signal is output, the first and second error signals are output from the malfunction preventing means 127 to the charge state display means 132 as an alarm signal, so that the charge state display means 132, i.e., dual The light emitting diode emits orange light to indicate that an input power source or the temperature of the secondary battery mounted in the portable terminal 90 is abnormal (overheating).

On the other hand, the secondary battery mounting detecting means 124 detects whether the output terminal 123 of the USB cable unit 120 and the connector socket 92 of the portable terminal 90 are electrically connected. When the output terminal 123 of the USB cable unit 120 and the connector socket 92 of the portable terminal 90 are not electrically connected, the switching means 131 in the secondary battery mounting detecting means 124. Since the switching control signal is not output to the control unit, the switching means 131 maintains the switching-off state to prevent occurrence of a safety accident such as a short circuit.

In the above description, when the input power detected by the input voltage detecting means 125 is abnormal, the input voltage detecting means 125 outputs a first error signal to the malfunction preventing means 127. When the temperature of the secondary battery mounted on the portable terminal 90 detected by the temperature detecting means 126 is abnormal (overheating), the temperature detecting means 126 performs the constant current / constant voltage detecting means. Since the second error signal is output to the 130, in order to prevent the occurrence of a safety accident, the malfunction preventing means 127 uses the constant current of the DC power for charging output from the USB socket 108 of the rectifying unit 100. / Does not output to the constant voltage detecting means 130.

Next, the DC power output from the USB socket 203 of the personal computer 200 is inserted by inserting the USB terminal 121 of the USB cable unit 120 into the USB socket 203 of the personal computer 200. The charging of the secondary battery mounted on the portable terminal 90 will be described.

The output terminal 123 of the USB cable unit 120 is inserted into the connector socket 92 of the portable terminal 90 to output the output terminal 123 of the USB cable unit 120 and the portable terminal 90. After the connector socket 92 is electrically connected, the USB terminal 121 of the USB cable unit 120 is inserted into the USB socket 203 of the personal computer 200 to connect the USB of the USB cable unit 120. The terminal 121 and the USB socket 203 of the personal computer 200 are electrically connected.

Next, when the main switch (not shown) of the personal computer 200 is switched on, the output terminal 123 of the USB cable unit 120 and the connector socket 92 of the portable terminal 90 are electrically connected. The output terminal 123 of the USB cable unit 120 and the connector socket 92 of the portable terminal 90 are electrically connected by detecting whether the 8 (b) b (high level voltage), the switching means 131 is switched on by outputting a switching control signal from the secondary battery mounting detecting means 124 to the switching means 131. State, that is, conduction state.

At this time, since the data communication is performed between the personal computer 200 and the portable terminal 90 via the data communication line l1 of the USB cable 122, the communication data detecting means 128 causes the data communication. The personal computer 200 and the portable terminal 90 detect whether or not the personal computer 200 and the portable terminal 90 are in data communication through the data communication line l1 of the USB cable 122. In the case of data communication, an output signal indicating that data communication is in progress is output to the constant current / constant voltage detecting means 130.

At the same time, the input voltage detecting means 125 and the malfunction preventing means 127 are connected to the input voltage detecting means 125 and the malfunction preventing means 127 through the power supply line ℓ2 of the USB cable 122 (a in FIG. Since 4.5Vdc to 6.0Vdc is applied, the input voltage (4.5Vdc to 6.0Vdc) detected by the input voltage detecting means 125 is not abnormal, and the temperature detected by the temperature detecting means 126 is When the temperature of the secondary battery mounted on the portable terminal 90 is not abnormal, the malfunction prevention means 127 charges the secondary battery of the portable terminal 90 at a predetermined level, that is, the personal computer 200. The DC power supply for charging outputted from the USB socket 203 is output to the constant current / constant voltage detecting means 130 as it is.

Accordingly, the USB terminal 121 of the USB cable unit 120 is connected to the USB socket 203 of the personal computer 200, so that the switching means 131 is used in the constant current / constant voltage detecting means 130. Since the USB mode charging current (see FIG. 8 (d)) is output to the secondary battery of the portable terminal 90 connected to the output terminal 123 of the USB cable unit 120.

The secondary battery charging state detecting unit 129 detects a state of charge charged in the secondary battery of the portable terminal 90 mounted on the output terminal 123 of the USB cable unit 120. When the secondary battery mounted on the portable terminal 90 is defective or in an over-discharge state, the secondary battery mounted on the portable terminal 90 is charged with a fine current f in the low current charging section in FIG. 8 (d). After the charged voltage of the secondary battery mounted on the portable terminal 90 becomes 2.5 Vdc, the charging current (see g '(see, for example, 300 to 500 mA) in FIG. 8 (d)) in the current mode charging section is shown. When fast charging and the charging voltage of the secondary battery mounted on the portable terminal 90 reaches 4.2Vdc, it is charged while gradually reducing the charging current in the voltage mode (see h of FIG. 8d), and FIG. 8 ( Full charge after the point i of d) when the charging current reaches 1/10 of the charging current (see g 'in Fig. 8 (d)). I judge it. Accordingly, it is possible to prevent the secondary battery mounted on the portable terminal 90 from being overheated.

In the above description, the state of charge charged in the secondary battery of the portable terminal 90 mounted on the output terminal 123 of the USB cable unit 120 is determined by the secondary battery state of charge detecting means 129. If the secondary battery mounted on the portable terminal 90 is not a defective or over-discharged state, it is rapidly detected by the rapid charging current (see g 'in FIG. 8 (d)) in the current mode charging section of FIG. To charge.

As described above, when the secondary battery mounted on the portable terminal 90 is in a fully charged state, the constant current / constant voltage output from the constant current / constant voltage detecting means 130 is received and the charge current output from the switching means is received. The charging state display means 132, that is, the dual light emitting diodes emit light green to indicate that the secondary battery mounted in the portable terminal 90 is in a fully charged state.

When the battery is not in a fully charged state, that is, when the secondary battery mounted in the portable terminal 90 is not in a fully charged state, the constant current / constant voltage output from the constant current / constant voltage detecting means 130 is received, and the In response to the charging current output from the switching means, the charging state display means 132, ie, the dual light emitting diode, emits red light, indicating that the secondary battery mounted in the portable terminal 90 is being charged.

On the other hand, when the input power detected by the input voltage detecting means 125 is abnormal, the input voltage detecting means 125 outputs a first error signal to the malfunction preventing means 127, and the temperature When the temperature of the secondary battery mounted on the portable terminal 90 detected by the detecting means 126 is abnormal, the temperature detecting means 126 sends a second error signal to the malfunction preventing means 127. Since the malfunction prevention means 127 outputs the first and second error signals to the charge state display means 132 as an alarm signal, the charge state display means 132, i.e., the dual light emitting diodes turn orange. The light emission indicates that there is an abnormal temperature of the secondary battery mounted on the input power source or the portable terminal 90.

On the other hand, the secondary battery mounting detecting means 124 detects whether the output terminal 123 of the USB cable unit 120 and the connector socket 92 of the portable terminal 90 are electrically connected. When the output terminal 123 of the USB cable unit 120 and the connector socket 92 of the portable terminal 90 are not electrically connected, the switching means 131 in the secondary battery mounting detecting means 124. Since the switching control signal is not output to the control unit, the switching means 131 maintains the switching-off state to prevent occurrence of a safety accident such as a short circuit.

In the above description, when the input power detected by the input voltage detecting means 125 is abnormal, the input voltage detecting means 125 outputs a first error signal to the malfunction preventing means 127. When the temperature of the secondary battery mounted on the portable terminal 90 detected by the temperature detecting means 126 is abnormal (overheating), the temperature detecting means 126 performs the constant current / constant voltage detecting means. Since the second error signal is output to the 130, in order to prevent the occurrence of a safety accident, the malfunction preventing means 127 uses the charging DC power output from the USB socket 203 of the personal computer 200 as the constant current. / Does not output to the constant voltage detecting means 130.

Therefore, according to the charging device for a secondary battery built in a terminal using a commercial AC power supply and a DC power supply of a personal computer of the present invention, the secondary battery built in the terminal is selectively connected to a USB socket or an AC power line of the personal computer. (Lithium ion battery or lithium polymer battery) can be charged, connected to the USB socket of a personal computer, detects the signal of the data communication line of the USB cable, determines whether it is charged, and sets the charging current. When charging a bad battery or over-discharge battery, it can be charged by reducing the charging current (FOLD BACK charging) to prevent overheating.If the battery is not connected to the output terminal, it can cut off the charging voltage and charging current. have.

In the above description, the specific embodiments have been shown and described, but the present invention is not limited thereto, for example, by those skilled in the art without departing from the concept of the present invention. Of course, the design can be changed in various ways.

As described above, according to the charging device for a secondary battery built in a terminal using a commercial AC power supply and a DC power supply of a personal computer, the terminal may be selectively connected to a USB socket or an AC power line of the personal computer. Charges a rechargeable battery (lithium ion battery or lithium polymer battery), connects to a USB socket on a personal computer, detects a signal from a data cable on a USB cable, determines whether it is charged, and sets the charging current. When charging a bad battery or an over-discharge battery, it can be charged by reducing the charging current (FOLD BACK charging) to prevent overheating.If the battery is not connected to the output terminal, the charging voltage and charging current There is an excellent effect that you can block.

Claims (3)

delete delete The plug 101 connected to the AC power supply outlet is integrally disposed on one side, and the USB socket 108 is electrically connected to the other side via the power cable 102, and the AC power is supplied at a specific level. A rectifying unit 100 rectified by a power supply and a USB terminal 121 electrically connected to the USB socket 108 of the rectifying unit 100 and the USB socket 203 of the personal computer 200 are disposed. It is electrically connected to the USB socket 203 of the computer 200 to enable data communication, and via the USB cable 122 from the USB terminal 121 to charge the secondary battery built in the portable terminal 90. In the charging device for a secondary battery provided with a USB cable unit 120 including an output terminal 123 disposed on the other side and electrically connected to the connector socket 92 of the portable terminal 90, The USB cable unit 120 charges the secondary battery built in the data communication line l1 and the portable terminal 90 so that the personal computer 200 and the portable terminal 90 are electrically connected to each other to enable data communication. A USB cable 122 having a power supply line l2 and a output terminal fixedly installed at an output side of the USB cable 122 and electrically connected to the connector socket 92 of the portable terminal 90 123 and a USB terminal 121 fixedly installed at an input side of the USB cable 122 and electrically connected to the USB socket 108 of the rectifying unit 100 or the USB socket 203 of the personal computer 200. ) And the USB terminal 121 fixedly installed at the input side of the USB cable 122 electrically connected to the USB socket 203 of the personal computer 200 or the USB socket 108 of the rectifying unit 100. Then the output terminal 123 and the connector of the portable terminal 90 The secondary battery mounting detecting means 124 for detecting whether the jacket 92 is electrically connected to the connector socket 92 of the portable terminal 90 to the output terminal 123 of the USB cable unit 120. Is detected by the secondary battery mounting detecting means 124, the DC power introduced through the power supply line l2 of the USB cable 122 is detected. An input voltage detecting means 125, a temperature detecting means 126 for detecting a secondary battery temperature of the portable terminal 90 mounted on the output terminal 123 of the USB cable unit 120, and the input voltage The charging power source to charge the secondary battery of the portable terminal 90 when the input power detected by the detecting means 125 is not abnormal and the temperature detected by the temperature detecting means 126 is not abnormal. While outputting (current and voltage), the input When there is an error in the input power detected by the pressure detecting means 125 When the first error signal output from the input voltage detecting means 125 or the temperature detected by the temperature detecting means 126 is abnormal Malfunction preventing means 127 which receives the second error signal output from the temperature detecting means 126 and blocks the output of the charging power (current and voltage) to prevent the secondary battery mounted in the portable terminal 90 from being charged. Communication data detecting means 128 for detecting whether the personal computer 200 and the portable terminal 90 are in data communication via the data communication line l1 of the USB cable 122, and Secondary battery charge state detection means 129 for detecting a state of charge charged in the secondary battery of the portable terminal 90 mounted on the output terminal 123 of the USB cable unit 120, the secondary battery communication By the data detection means 128 The outgoing communication data is in a state in which the personal computer 200 and the portable terminal 90 are in data communication. If not, the output terminal 123 of the USB cable unit 120 is connected to the USB socket 108 of the rectifying unit 100, so the output terminal of the USB cable unit 120 with a fast charging current ( Charges the secondary battery of the portable terminal 90 mounted on the 123, the portable terminal mounted on the output terminal 123 of the USB cable unit 120 by the secondary battery charge state detection means 129. Constant current / constant voltage detecting means 130 for detecting a constant current / constant voltage for controlling to charge with a low current when the secondary battery of the 90 is in an over-discharge state, and mounted on the output terminal 123 of the USB cable unit 120 Of the portable terminal 90 A switching means 131 for interrupting the output of the constant current or the constant voltage detected by the constant current / constant voltage detecting means 130, and receiving the charging current or the charging voltage output from the malfunction preventing means 127, and the constant current Alternatively, the portable terminal mounted on the output terminal 123 of the USB cable unit 120 receives the constant current or the constant voltage output from the constant voltage detecting means 130 and receives the constant current or the constant voltage output from the switching means 131. Charging apparatus of a secondary battery built in a terminal using a commercial AC power supply and a DC power supply of a personal computer, characterized in that the charging state display means 132 for displaying the state of charge of the secondary battery of the terminal 90 .

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