KR100354985B1 - Keyboard having multi-function telephone using line power - Google Patents

Abstract

The keyboard device disclosed herein incorporates a telephone utilizing the line power function. The keyboard device can be operated by the computer power when the computer system is powered on, and by the line power of the telephone line when the computer system is powered off, so that the basic phone call function and various additional functions can be operated even when the computer is powered off. Can be used. The keyboard device has at least two modes of operation, including a phone mode and a keyboard mode. The keyboard device provides a convenience of simultaneously using the keyboard and making a phone call by changing to a keyboard mode after the call path is connected. In the phone mode, all the keys of the keyboard device can be used for the phone function to realize various additional functions such as automatic dialing and phone book creation. Such a keyboard device of the present invention provides a convenient phone environment for computer keyboard users.

Description

KEYBOARD HAVING MULTI-FUNCTION TELEPHONE USING LINE POWER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer keyboard device, and more particularly, to a phone built-in keyboard device using line power that can operate independently even when there is no power source or a separate external power source. .

Computer systems are data processing devices that are widely used in general office environments, homes, specialized research fields, and industries. With the proliferation of personal computers, the office environment is changing to a personal computer based office environment. As a data input device of a computer system, a keyboard device and a pointing device called a 'mouse' are generally used.

Recently, computer keyboard devices with built-in telephones have been provided to provide a more convenient environment for personal computer users. As related technologies, Korean Patent Publication No. 1999-007717 'Computer Keyboard with Telephone Function', Korean Practical Publication No. 1998-063281 'Keyboard with Telephone Function', Korean Practical Publication No. 1999-0035143 'Computer with Phone Keyboard '.

Keyboard devices incorporating the above-mentioned telephones help the user in terms of convenience in using the telephone when using a computer. These phone built-in keyboard devices use a combination of a phone and a keyboard device. They are faithful to basic phone call functions and do not provide various phone functions.

On the other hand, since the telephone circuit mounted in the keyboard is operated by a computer power supply, its use is limited in that it can be used only when the computer is operating. Of course, the keyboard device may have a separate power source such as a battery or an AC adapter, but this is not preferable in that the manufacturing cost of the product increases.

Accordingly, it is an object of the present invention to provide a telephone built-in keyboard device which can use a telephone function without a computer power as proposed to solve the above-mentioned problems.

It is another object of the present invention to provide a computer built-in keyboard device having various additional functions.

1 is a view showing the appearance of the built-in telephone apparatus of the present invention;

Fig. 2 is a block diagram showing a schematic circuit configuration of the built-in telephone apparatus of the present invention.

3 is a circuit block diagram showing a detailed configuration of the telephone circuit of FIG.

4 is a detailed circuit diagram of a latch relay and a relay driver of FIG. 3;

5 is an equivalent circuit diagram of the voice call unit of FIG. 3; And

FIG. 6 is a detailed circuit diagram of the line power supply circuit of FIG. 2.

* Description of the symbols for the main parts of the drawings *

100: keyboard device 110: headset

120: microphone / speaker 130: liquid crystal display

140: hook switch 150: mode change switch

According to a feature of the present invention for achieving the object of the present invention as described above, a keyboard device used as a data input device of the host system comprises: a telephone circuit connected to a telephone line and embedded in the keyboard device; A line power supply circuit for generating operational power of the keyboard device using line power input from a telephone line through the telephone circuit when there is no power supply from the host system; And a microcomputer that performs overall control of the keyboard device, including keyboard input control to generate scan codes according to key input of a key matrix and input them to the host, and control of the telephone circuit.

In this embodiment, a nonvolatile memory for storing telephone-related data including a speed dial number and a user defined phone book, wherein the microcomputer generates a scan code according to the input of the key matrix to the host. It has a keyboard mode for inputting and a telephone mode for controlling a telephone call function using the telephone circuit, and in the telephone mode all key inputs of the key matrix are used for telephone functions. The keyboard device includes a mode change switch connected to the microcomputer, and the microcomputer is set to either the keyboard mode or the telephone mode according to the input of the mode change switch.

In this embodiment, the telephone circuit is connected to the telephone line and interlocked with a relay and a hook switch for connecting / blocking a call path, and the relay circuit is configured to connect the call path when the hook switch is switched to a hook-off state. And a relay driver for switching operation. The relay is configured of a latch type that maintains the switching state even if the input of the switching control signal is not maintained.

In this embodiment, the line power supply circuit includes a constant voltage / constant current generator for generating a constant voltage / constant current by using the spare current remaining in the telephone circuit; A switching mode power supply for generating a power supply voltage of the keyboard device using the constant voltage / constant current generated by the constant voltage / constant current generator; And switching means configured on the current path between the constant voltage / constant current generator and the switching mode power supply, switched to connect the current path in the hook-off state, and switched to block the current path in the hook-on state.

The line power supply circuit includes a rechargeable battery, and the battery is charged by the constant voltage / constant current output from the constant voltage / constant current generator, and supplies initial operation power according to a call path during hook off switching operation of a hook switch. to provide. And the line power supply circuit comprises: a first diode connected between the constant voltage / constant current generator and the battery to prevent discharge of the battery; A second diode connected to an output end of the switched mode power supply to prevent a current supplied from the host system from flowing in; And a third diode configured on a power line provided from the host system to prevent a current output from the switched mode power supply from flowing into the host system.

(Example)

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

The novel telephone embedded keyboard device of the present invention can be operated by the computer power when the computer system is in the power-on state, and can be operated by the line power of the telephone line without a separate power supply when the computer system is in the power-off state. Even when you are off, you can still use both basic phone calls and various secondary functions. The keyboard device has at least two modes of operation including a phone mode and a keyboard mode, and after the call path is connected in the phone mode, the keyboard device can be changed back to the keyboard mode to simultaneously use the keyboard and make a phone call. In the phone mode, all the keys of the keyboard device can be used for the phone function to realize various additional functions such as automatic dialing and phone book creation. Such a keyboard device of the present invention provides a convenient phone environment for computer keyboard users.

1 is a view showing the appearance of the built-in telephone apparatus of the present invention. Referring to the drawings, the keyboard device 100 of the present invention provides a phone function together with a function as a general computer keyboard device. The keyboard device 100 has a headset 110 in which the speaker 111 and the microphone 112 are integrally formed. A small high sensitivity microphone / speaker 120 is mounted on the right side of the upper center of the keyboard device 100, and a liquid crystal display 130 is mounted on the upper left side of the keyboard device 100. On the left side of the upper center, the hook switch 140 and the mode switching switch 150 are provided side by side. In addition, keyboard keys including a function key, a numeric key, a character key, and the like are arranged in the same way as a key arrangement of a general keyboard device.

The keyboard device 100 is capable of a telephone call using the headset 110 and a telephone call using the microphone / speaker 120, respectively. When the user wants to make a phone call using the headset 110, the user connects the headset 110 to a headset jack (not shown) provided on the right side of the keyboard device 100, and tries to make a hand free call. In the case, the headset 110 is disconnected from the headset jack and the call is made through the microphone / speaker 120. The hook switch 140 and the mode switch 150 may be a toggle switch, and the user may set the keyboard device 100 to the keyboard mode and the phone mode by using the mode switch 150. The liquid crystal display 130 is a graphic type liquid crystal display capable of displaying Korean, English, numerals, special characters, and the like, and displays various phone related information such as hook on / off and telephone number.

2 is a block diagram showing a schematic circuit configuration of the keyboard device with built-in telephone of the present invention. As shown, the telephone embedded keyboard device 100 of the present invention is used as an input device of the host system 200 such as a general personal computer. The keyboard device 100 includes a microcomputer 160, a key matrix 170, a line power supply circuit 180, and a telephone circuit 190. And a keyboard cable 102 for connecting to the host system 200, a telephone jack 104 for connecting the telephone line 300, and a headset jack 106 for connecting the headset 110.

The microcomputer 160 performs overall control of the keyboard device 100. The microcomputer 160 sets the keyboard apparatus 100 to the keyboard mode or the telephone mode according to the input of the mode change switch 150, and performs the corresponding control in each mode. In the keyboard mode, the microcomputer 160 generates a scan code in response to a key input input from the key matrix 170, and keyboard data signal corresponding to the scan code to the host system 200 via the keyboard cable 102. Transmit (KDAT) and keyboard clock signal (KCLK). In the telephone mode, the microcomputer 160 performs the telephone function control in response to the key input input from the key matrix 170, and displays the display information according to the telephone function performance on the liquid crystal display 130. The EEPROM 165 stores various data related to the telephone function. Telephone circuit 190 has circuit configurations for telephone conversations.

The telephone embedded keyboard device 100 of the present invention has various additional functions that operate in the telephone mode, for example, a speed dial function, a user-defined phone book creation and search function. In telephone mode, all keys of key matrix 170 are defined to be used for telephone functionality. Microcomputer 160 performs various telephone add functions in response to key input from key matrix 170 in telephone mode. For example, certain keys of the key matrix 170 can be designated as shortcut keys for automatic dialing. When a designated shortcut key is entered, the microcomputer 160 automatically dials the designated phone number using the telephone circuit 190. do. The user can easily create, edit and delete the phonebook using all the keys of the keymatrix in phone mode. In addition, you can easily use the text service function.

As described above, the keyboard device 100 uses the power as the operating power when the power is supplied from the host system 200 through the keyboard cable 102, and the power is not supplied from the host system 200. In this case, the line power flowing from the telephone line 400 is used as the operating power. The line power supply circuit 180 provides power supplied from the telephone line 300 as operating power of the keyboard device 100 when there is no power supply from the host system 200. Typically, communication devices connected to a telephone line are specified to transmit normal signals within DC 48V and 20mA. Therefore, in the keyboard device 100 of the present invention, the digital circuits such as the liquid crystal display 130, the microcomputer 160, and the EEPROM 165 are configured in a CMOS type so that the total current consumption is less than 10 mA, and the telephone circuit 190 ) Uses an integrated circuit of high efficiency to enable the total current consumption of the keyboard device 100 to be within 20 mA.

As will be described later, the line power supply circuit 180 is provided with a small rechargeable battery (not shown), and the battery power is used as the initial driving power of the keyboard device 100 without the power supply from the host system 200. do. The battery is charged using the line power of the telephone line. Hereinafter, a power source generated using the line power is referred to as a line power source LVcc.

Subsequently, a detailed circuit configuration and operation of the telephone circuit 190 and the line power supply circuit 180 of the present invention will be described in detail with reference to FIGS. 3 to 6.

3 is a circuit block diagram showing a detailed configuration of the telephone circuit 190 of FIG. Referring to the drawings, the telephone circuit 190 includes a latch relay 191, an incoming signal generator 192, a bell 193, a light emitting diode LED1, a bridge diode BZ1, a zener diode ZD1, and a relay driver. 194, a melody generating unit 195, a DTMF generating unit 196, a voice call unit 197, and a switch 198.

The latch relay 191 is a latch type relay that maintains the switching state even after the input of the control signal is not maintained after being switched by an external switching control signal. Therefore, there is almost no current consumption, so it does not affect the change of current consumption during telephone conversation. The latch relay 191 switches in conjunction with the on / off operation of the hook switch 140, and the switching operation is controlled by the relay driver 194 and the microcomputer 160. The latch relay 191 is switched to connect the telephone line 300 and the incoming signal generator 192 in the hooked-off state, and is switched to connect the telephone line 300 and the voice call unit 197 in the hooked-off state. It is.

4 is a detailed circuit diagram of the latch relay 191 and the relay driver 194 of FIG. 3. Referring to FIG. 4, the latch relay 191 has an input terminal IN connected to the telephone line 300, a first output terminal OUT1 connected to the incoming signal generator 192, and a second bridge diode BZ1. The latch relay switch LRS to which the output terminal OUT2 is connected, the relay coils RL1 and RL2 having one end connected to the line power supply LVcc, the other end of the relay coils RL1 and RL2, and the analog ground AGND. The transistors Q1 and Q2 are connected to each other. The base of the transistor Q1 is connected to the relay driver 194, and the base of the transistor Q2 is connected to the microcomputer 160.

The relay driver 194 is connected in series between the resistors R1 and R2 connected in series between the base of the transistor Q1 and the analog ground AGND, the line power supply LVcc, and the analog ground AGND. And a capacitor C2 connected between the switch SW1 and the resistor R3, the connection node of the resistor R1 and the resistor R2, and the connection node of the switch SW1 and the resistor R3. The switch SW1 is interlocked with the hook switch 140.

When the hook switch 140 is input, the switch SW1 is turned on in association with the hook switch 140 and the line power supply LVcc is provided to the relay driver 194 to generate a pulse signal. The transistor Q1 of the latch relay 191 is turned on by the pulse signal, and the line power supply LVcc is provided to the relay coil RL1 to induce an electromagnetic field in the relay coil RL1. Accordingly, the latch relay switch LRS is switched to connect the telephone line 300 and the bridge diode BZ1. In this manner, when the hook-off state is established, a phone call can be made using the telephone function of the keyboard device 100.

In the hook off state, the input of the hook switch 140 is sensed by the microcomputer 160. When the input of the hook switch 140 is detected in the hook-off state, the microcomputer 160 generates a pulse signal for switching the latch relay 191 to the hook-on state and inputs it to the latch relay 191. The transistor Q2 of the latch relay 191 is turned on by the pulse signal from the microcomputer 160, the line power supply LVcc is provided to the relay coil RL2, and an electromagnetic field is induced in the relay coil RL2. . Accordingly, the latch relay switch LRS is switched to connect the telephone line 300 and the incoming signal generator 192. In this manner, the hook is turned on.

As will be described in detail later, since the latch relay 191 and the relay driver 194 operate by power supplied from a battery provided in the line power supply circuit 160, the latch relay 191 and the relay driver 194 may operate even when the host system 200 is powered off. It is possible.

3, the operation of the telephone circuit 190 will now be described. In the hook-on state, the ring signal transmitted to the telephone line 300 is input to the incoming signal generator 192 through the latch relay 191 and the condenser C1. The incoming signal generator 192 generates an incoming signal in response to receiving the ring signal to operate the bell 193 and the light emitting diode LED1. A switch is configured between the incoming signal generator 192 and the bell 193 and the light emitting diode LED1 so that only one of the bell 193 or the light emitting diode LED1 operates upon receiving a ring signal according to a user's selection. It may be.

In the hook-off state, the current flowing from the telephone line 300 is rectified through the bridge diode BZ1 and the peak voltage is limited by the zener diode ZD1 and flows into the voice call unit 197. The surplus current remaining in the voice call unit 197 flows into the line power supply circuit 180. The voice call unit 197 is a circuit for voice transmission and reception, and either the headset 110 or the microphone / speaker 120 is connected through the switch 198. The voice call unit 197 is designed to have low power consumption characteristics, and an equivalent circuit thereof is shown in FIG. 5.

FIG. 5 is an equivalent circuit diagram of the voice call unit 197 of FIG. 3. Referring to the drawing, the voice call unit 197 includes a resistor RX for limiting an input current, resistors BR1, BR2, BR3, and BR4 constituting a resistance bridge, and a constant current source In. The resistors BR1, BR2, BR3, and BR4 constituting the resistance bridge satisfy the relationship BR1 * BR2 = BR3 * BR4, and the resistance value is determined such that the current flowing in the constant current source In is 5mA. Therefore, side tone that may be generated during a voice call is not generated.

3, when the headset 110 is connected to the keyboard device 100, the switch 198 is switched so that the voice call unit 1 96 and the headset 110 are connected to each other. When 110 is not connected, the voice call unit 196 and the microphone / speaker 120 are switched to be connected. The melody generating unit 198 generates a waiting sound signal during a call under the control of the microcomputer 160, and the generated waiting sound signal is output to the telephone line through the voice calling unit 196 and the bridge diode BZ1. The DTMF generation unit 199 generates a DTMF signal under the control of the microcomputer 160, and the generated DTMF signal is output to the telephone line through the voice call unit 196 and the bridge diode BZ1.

Next, the line power supply circuit 180 of FIG. 2 will be described with reference to FIG. 6. 6 is a detailed circuit diagram of the line power supply circuit 180 of FIG.

Referring to the drawings, the line power supply circuit 180 includes a constant voltage / constant current generator 182 for generating a constant voltage / constant current by the transistors Q3 and Q4 constituting the emitter follower and the rechargeable battery BT. , A diode D1 that prevents the battery BT power from being discharged backward, a transistor Q5 that outputs the power of the battery power or the constant voltage / constant current generator 182 to the line power LVcc, and the switching mode power SMPS Supply) 185 and diodes D2 and D3 for preventing the power generated from the SMPS 185 and the power input from the host system 200 from flowing back into each other.

The constant voltage / constant current generator 182 generates constant voltage and constant current by the transistors Q3 and Q4 constituting the emitter follower. The current flowing through the transistor Q3 is determined by the variable resistor VR1 and is opposite to the current change by the voice call unit 197 by the capacitor C3 connected between the bases of the transistors Q3 and Q4. The bias voltage of the phase component is applied. Therefore, the remaining current consumed in the voice call unit 197 passes through the transistors Q3 and Q4. The constant current passing through the transistors Q3 and Q4 is output through the diode D1 and used as a charging current when the battery BT needs to be charged. The constant current passing through the diode D1 is output to the line power supply LVcc through the transistor Q5. This line power supply LVcc is provided to the SMPS 185.

The SMPS 185 is composed of an oscillator 186, a transformer 187, and a rectifier 188. The oscillator 186 oscillates by receiving the line power supply LVcc, and the oscillation frequency is designed to be a frequency of a band in which the oscillation frequency is higher than the audible frequency and unnecessary harmonic noise is not generated. When the oscillator 186 oscillates, the current converted by the transformer 187 to an appropriate voltage level is provided to the rectifier 188. The rectifier 188 rectifies the current flowing from the transformer 187 and outputs it as a power supply voltage Vcc through the diode D2. The oscillator 186 is grounded to the analog ground AGND, and the rectifier 188 is grounded to the digital ground DGND, thereby preventing mutual noise from occurring between the analog circuit and the digital circuit.

The base of transistor Q5 is connected to hook switch 140 and microcomputer 160 via resistor R5. The hook switch 140 is a switch having three contacts 140a, 140b, and 140c, and the first contact 140a is connected to the analog ground AGND, and the second contact 140b is connected to the transistor R5 through the resistor R5. It is connected to the base of Q5). The third contact 140c is pulled up to the power supply voltage Vcc through the resistor R6. The hook switch 140a is connected to the first contact 140a and the second contact 140c in a normal state, and is connected to the first contact 140a and the second contact 140b when switched.

As soon as the hook switch 140 is switched, the transistor Q5 is turned on so that the power of the battery BT is supplied to the line power supply LVcc. As described above, the switch SW1 of the relay driver 194 is hooked. The latch relay 191 operates in conjunction with the switch 140. Therefore, a currency path is constructed. The line power supply LVcc supplied by the battery BT is also provided to the SMPS 185 to generate the power supply voltage Vcc, which is an initial stage of the microcomputer 160 when the host system 200 is powered off. It is also used as a driving power source. The voltage generated by the SMPS 185 is set to be slightly lower than the 5V voltage provided by the host system 200. When the host system 200 is powered on, the 5V power provided by the host system 200 is the power supply voltage (Vcc). To be used).

When the hook switch 140 is switched to the hook-off state, the microcomputer 160 transmits a low level signal to the base terminal of the transistor Q5 through the resistor R5 to keep the transistor Q5 turned on. to provide. Therefore, the constant current generated by the constant voltage / constant current generator 182 continues to be supplied to the SMPS 185. In this way, the digital circuits including the microcomputer 160 are supplied with the power supply voltage Vcc provided by the SMPS 185 even when the host system 200 is powered off.

In the above, the configuration and operation of a computer built-in phone keyboard device according to a preferred embodiment of the present invention has been shown in accordance with the above description and drawings, but this is only an example and within the scope not departing from the technical spirit of the present invention. It will be appreciated by those skilled in the art that various changes and modifications are possible.

According to the present invention as described above, the phone embedded keyboard device can be used even when the host system is powered off by adopting the line power technology, there is no need for a separate phone. After the call is connected in phone mode, you can switch back to the keyboard to use the keyboard and make phone calls at the same time. In addition, various additional functions are provided to provide a user with a more convenient phone environment. In addition, the manufacturing cost of the device can be reduced by using a single microcomputer rather than a microcomputer for controlling telephone functions and keyboard functions.

Claims (8)

In the keyboard device used as the data input device of the host system: Telephone circuitry connected to a telephone line and embedded in the keyboard device; A line power supply circuit for generating operational power of the keyboard device using line power input from a telephone line through the telephone circuit when there is no power supply from the host system; And a microcomputer configured to perform overall control of the keyboard device including a keyboard input control generated by a scan code according to a key input of a key matrix and input to the host and a control of the telephone circuit. . The method of claim 1, The keyboard device includes a nonvolatile memory for storing telephone related data including speed dial numbers, user defined phone books, The microcomputer has a keyboard mode for generating a scan code according to the input of the key matrix and inputting it to the host, and a phone mode for controlling a telephone call function using the phone circuit. In the phone mode, key input of the key matrix is performed. A keyboard built-in keyboard device, which is used for each of a speed dial function, a phone book creation, editing, and deletion function, and a phone function for performing a text service function. The method of claim 2, The keyboard device includes a mode change switch connected to the microcomputer, And the microcomputer is set to either the keyboard mode or the telephone mode according to the input of the mode change switch. The method of claim 1, The telephone circuit is: A relay connected to the telephone line to connect / block a call path; And a relay driver for interlocking with a hook switch and switching the relay so that a call path is connected when the hook switch is switched to a hook-off state. The method of claim 4, wherein And the relay is of a latch type for maintaining a switching state even if an input of a switching control signal is not maintained. The method of claim 1, The line power supply circuit is: A constant voltage / constant current generator for generating a constant voltage / constant current by using the spare current remaining in the telephone circuit; A switching mode power supply for generating a power supply voltage of the keyboard device using the constant voltage / constant current generated by the constant voltage / constant current generator; A switching means configured on a current path between the constant voltage / constant current generator and the switched mode power supply, switched to connect the current path in a hook-off state, and switched to block the current path in a hook-on state. A keyboard device with a built-in telephone. The method of claim 6, The line power supply circuit comprises a rechargeable battery, And the battery is charged by the constant voltage / constant current output from the constant voltage / constant current generator, and provides initial operation power according to a call path during the hook-off switching operation of the hook switch. The method of claim 7, wherein The line power supply circuit is: A first diode connected between the constant voltage / constant current generator and the battery to prevent discharge of the battery; A second diode connected to an output end of the switched mode power supply to prevent a current supplied from the host system from flowing in; And a third diode configured on a power line provided from the host system to prevent a current output from the switched mode power supply from flowing into the host system.