KR950007093B1 - The bathery supply circuit and the secret number transmitting method in radio phone - Google Patents

Abstract

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Description

Cordless phone power supply circuit and password transmission and reception method

1 is a power supply circuit diagram of a conventional cordless telephone.

2 is a power supply circuit diagram of a wireless telephone according to the present invention.

3 and 4 is a flow chart of the password transmission and reception according to the present invention.

The present invention relates to a charging voltage supply circuit of a radiotelephone comprising a fixed device and a portable device, and more particularly, to a power supply circuit and a password transmission / reception method of a wireless phone to simultaneously transmit a charging voltage and a password.

A cordless phone generally includes a fixed device and a portable device, and the portable device is operated by a power source of a rechargeable battery. The battery in the portable device charges the voltage supplied from the fixing device by mechanical contact between the two devices when the battery is mounted (coupled) to the fixing device.

In the wireless telephone, the fixed device and the portable device are assigned the same unique password in order to prevent theft of another person and interference with the portable device of another wireless telephone in the vicinity. By assigning the same password to each of the fixed device and the portable device as described above, only the fixed device and the portable device having the same password can make a wireless call. These passwords are usually assigned by the manufacturer of the cordless phone at the end of the production phase.

Granting a password of the portable device means that the password is transmitted from the fixed device when the password is first combined with the fixed device already stored in the permanent storage memory. Is stored in the internal permanent storage of the device.

FIG. 1 is a power supply circuit diagram of a conventional cordless telephone. The MPU 12 controls the operation in a fixed device, the first and second pads 14 and 18 for outputting a charging voltage, and outputs data. The third pad 16, a resistor R1 connected between the data input / output port of the MPU 12 and the third pad 16, the resistor R1 and the third pad 16. A fixing device 10 composed of a resistor R2 composed of a resistor R2 connected between a connection node of the power supply and a power supply voltage Vcc; The fourth and fifth pads 24 and 28 for inputting the charging voltage, the sixth pad 26 for receiving data, and the charging voltages input to the fourth and fifth pads 24 and 28 are provided. A battery 30 connected to both terminals of the battery 30 to charge and output, and in response to the input of the data output from the sixth pad 26 in response to switching the input data inverted ( R3) and a portable device 12 composed of a transistor Q1 and an MPU 2 for receiving data output from the collector of the transistor Q1 and outputting the data as stored data and controlling the operation in the subsequent device. have.

The first, second, and third pads 14, 16, and 18 and the fourth, fifth, and sixth pads 24, 26, and 28 of the configuration of FIG. 1 are portable devices on the top of the fixing device 10. These pads are in contact when 20 is raised.

First, the charging and password communication operations of the portable device 20 in the conventional circuit will be described.

The fixing device 10 and the portable device 20 are separated and the first, second, and third pads 14, 16, and 18, and the fourth, fifth, and sixth pads 24, 26, and 28. In this case, the charging unit 10 is supplied with a power supply voltage Vcc output from an internal power supply device (not shown). Each part of the portable device 20 is supplied with a charging voltage by the battery 30.

By supplying the power supply voltage as described above, the MPU 12 in the fixed device 10 and the MPU 22 of the portable device 20 search for and charge a logic state input to each data terminal D (P). Retrieve status authorization. That is, it is searched whether the portable device 20 and the fixed device 10 are coupled. In this state, when the power supply voltage Vcc is supplied to the data terminal D through the resistors R2 and R1, the portable device 20 is not mounted on the fixing device 10. The logic of the "high" state is input to the data terminal D of the MPU 12. When the data terminal D is in the "high" state, the MPU 12 in the fixing device 10 is in an uncharged state, that is, the portable device 20 is not placed on the fixing device 10. And do not send out the password data.

As described above, when the first, second, and third pads 14, 18, and 16 and the fourth, fifth, and sixth pads 24, 28, and 26 are not charged, the sixth pad 26 is not charged. Since no signal is input to the transistor Q1, the transistor Q1 is turned off. When the transistor Q1 is turned off, the voltage of the battery 32 through the resistor R3 is input to the data terminal P of the MPU 22. At this time, the MPU 22 recognizes an uncharged state by a signal of "high" through the resistor R3.

When the portable device 20 is coupled to the fixing device 10, the first, second, and third pads 14, 18, and 16 of the fixing device 10 and the corresponding portable device 20 are formed. Fourth, fifth, and sixth pads 24, 28, and 26 are connected. When the pads of the fixing device 10 and the pads of the portable device are connected as described above, the voltage of the fixing device 10 supplied from the first and second pads 14 and 16 is changed to the fourth of the portable device 20. The terminals are input to both terminals of the battery 30 through the fifth pads 24 and 28. Therefore, when the portable device 20 is coupled to the fixing device 10 as described above, the battery 30 in the portable device 20 charges the voltage input through the fourth and fifth pads 24 and 28. Done.

In addition, when the third pad 16 and the sixth pad 26 are connected, a voltage through the resistor R2 in the fixing device 10 is applied to the transistor Q1 in the portable device 20 through the connected pads. It is input to the base. At this time, the transistor Q1 is "on" switched by forward biasing by the voltage through the resistor R2. When the transistor Q1 is forward biased and "on" switched, the voltage level of the third pad 16 drops to a level of about 1 volt, so that the data terminal D of the MPU 12 through the resistor R1. The logic entered into) becomes "low". As described above, when the data terminal of the MPU 12 becomes “low”, the MPU 12 recognizes that the fixed device 10 and the portable device 20 are combined to enter a charging state. When the transistor Q1 is switched on as described above, the voltage through the resistor R3 is bypassed between the collector and the emitter of the transistor Q1. Therefore, the collector of the transistor Q1 is at a voltage level of "low". At this time, the MPU 22 recognizes that the state of charge has been entered by the "low" voltage input to the data terminal (P).

Therefore, when the fixing device 10 and the portable device 20 are combined, the battery 30 in the portable device 20 charges the charging voltage output from the fixing device 10, and the portable device 10 and the portable device 20 are portable. Each of the devices 20 will all recognize that it is in a charged state.

The MPU 12 in the fixing device 10 recognizing that the state of charge has been entered by the above operation outputs the data of the password stored in the permanent storage memory therein to the data terminal (D). For example, if the password is "0101010", the MPU 12 outputs a signal changed to "low" and "high" to the data terminal D. When a signal of “low” is output from the data terminal D of the MPU 12, a voltage through the resistor R2 flows to the data terminal D of the MPU 12 so that the resistor R2 is connected with the resistor R2. The level of the connection node of the resistor R1 drops. At this time, the level of the sixth pad 26 falls to a voltage of about 0.7 volts or less, so that the transistor Q1 is “off”.

When the transistor Q1 is turned off, the data terminal P of the MPU 22 in the portable device 20 is pulled up to a voltage by the resistor R3 connected to the constant voltage terminal (+) terminal of the battery 30. By pulling up, the MPU 22 recognizes the input of the data in a logic "high" state. If the MPU 12 in the fixing device 10 outputs logic “high” data to the data terminal D, the operation of the MPU 22 in the portable device 20 is logical because the operation is the same as that of charging. Enter the low data.

The MPU 22 that received the data by the above operation inverts the received data and stores the received data in the memory (EEPROM) 32.

However, the conventional circuit for transmitting the charging voltage and the password by the circuit shown in FIG. 1 has the following problems by sending the charging voltage and the data to three pads (terminals).

(1) Installation of three metal pads in each device was inconvenient for error generation and assembly due to mechanical contact.

(2) By sending the password data using the second pad 16 and the second pad 18, the first pad 14, which is a power supply terminal, and the third pad 16, which is a data terminal, transmit data at the time of short. There was a problem that could not be sent.

Accordingly, the present invention provides a circuit capable of simultaneously transmitting voltage charging and password using the voltage charging terminal.

Another object of the present invention is to provide a method for simultaneously transmitting voltage charging and password using the voltage charging terminal.

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

2 is a power supply circuit diagram of a wireless telephone according to the present invention, which includes an MPU 102 for controlling an operation in a fixed device, first and second voltage terminals 104 and 106 for outputting a charging voltage, A resistor R12 and transistor Q11 connected in series between the two voltage terminals 106 and the second voltage GND and switched in response to the current path control signal, and the data terminal P1 of the MPU 102. A fixing device (100) consisting of P2 and resistors R11 and R13 connected between the second voltage terminal 106 and the second voltage, respectively; Second and fourth pads 204 and 206 for inputting a charging voltage, a battery 210 for charging a charging voltage input to the third and fourth pads 204 and 206, and the third pad ( Voltage divider resistors R14 and R16 connected between the second voltage terminal 204 and the second voltage terminal 204 to divide the voltage input to the third voltage terminal 204 into a logic voltage having a predetermined level; and the third voltage terminal 204. And a diode 208 connected between the battery 210 and the battery 210 in one direction to output the voltage input to the third terminal 204 to the battery 210 and the output voltage of the battery 210. A MPU 202 for receiving secret data by inputting logic voltages output from the voltage dividing resistors R14 and R16, and controlling the portable device; and a memory for storing data under control of the MPU 202 ( EEPROM) 212 is configured as a portable device 200.

In the configuration of FIG. 2, the first and second voltage terminals 104 and 106 and the third and fourth voltage terminals 204 and 206 contact each other when the portable device 200 is ringed on the top of the fixing device 100. Metal pads.

3 is a flow chart illustrating a password transmission according to the present invention, which includes a charging state searching process for outputting a current path control signal and searching whether a charging start signal is input, and an internal storage area when determining that the charging state is in the charging state searching process. It consists of a data transmission process for sending out the password stored in the.

4 is a flowchart of a password transmission and reception according to the present invention, in which a signal state input to a data terminal is analyzed and stored in an internal memory.

Hereinafter, the operation of one embodiment of FIG. 2 according to the present invention will be described in detail with reference to the above-described drawings.

[Consciousness of uncharged state and charged state]

Now, when the fixing device 100 and the portable device 200 are separated and the first and second voltage terminals 104 and 106 and the fourth and fifth voltage terminals 204 and 206 are not separated, the charging operation is not performed. Each part of the fixing device 10 is supplied with a power supply voltage Vcc output from a power supply device (not shown) of the inner circumference, and a charging voltage by the battery 210 is supplied to each part of the portable device 20. .

At this time, the MPU 102 outputs a current path control signal having a "high" state to the data terminal P2 in FIG. 34 and in step 36, is the signal state input to the data terminal P1 "high"? Search for. That is, the MPU 102 searches whether the current state is a charge state as a signal input to the data terminal P1. Transistor Q11, which inputs the “high” current path signal output from the MPU 102 to the base through the resistor R13, is “on” switched. When the transistor Q11 is switched “on”, the second voltage terminal 106 is pulled down to the second voltage GND to a level of “low”. As described above, when the level of the second voltage terminal 106 becomes "low", the MPU 102 recognizes that it is in an uncharged state.

The MPU 202 in such a portable device 200 searches for a charging state by searching for a logic state input to the data terminal P3. For example, when the logic signal input to the data terminal P3 is "high", the controller recognizes the state of charge as "high", and when the logic signal is "low", the current state is uncoupled. The voltage level at 204 is low, which causes the MPU 202 to recognize the state of "low" and determine that it is uncharged.

When the fixing device 100 and the portable device 200 are coupled in the above state, the third and fourth voltage terminals 404 and 404 may be connected to the first and second voltage terminals 104 and 106. 206 is contacted. The voltage Vcc of the first voltage terminal 104 is applied to the third terminal 204 by the contact as described above, and the level of the second voltage GND is turned on by the “on” switching of the transistor Q11. The voltage at the second terminal 106 is applied to the fourth terminal 206.

Accordingly, the current of the voltage Vcc applied to the third voltage terminal 204 is transferred to the second voltage terminal 106 and the resistor through the one-way diode 208, the battery 21, and the fourth voltage terminal 206. It flows to ground through the collector-emitter of R1) and transistor Q11. That is, when the two devices are combined, the voltage Vcc output from the fixing device 100 is the third voltage terminal 204, the battery 210, the fourth voltage terminal 206, and the second voltage terminal 102. And a current path is formed through the " on " switched transistor Q11 so that the battery 210 is charged with the voltage Vcc output from the fixing device 100.

By the above operation, the voltage “V−” is applied between the second voltage terminal 102 and the ground, as shown in the following formula (1), and is connected between the third voltage terminal 204 and the fourth voltage terminal 206. The voltage "V +" as shown in equation (20) is applied.

V- = Vcc-(V _D -V _B ). … … … … … … … … … … … … … … Formula (1)

V + = (V _D -V _B ). … … … … … … … … … … … … … … … … … Formula (2)

Where V _D is the voltage drop of diode 208 and V _B is the voltage drop of battery 210.

Therefore, when charging is started, the voltage V− as in the first equation is input to the MPU 102 in the fixing device 100 through the resistor R11. At this time, the MPU 102 operating as described in FIG. 36 described above recognizes that a logic “high” is input to the data terminal P1 and determines that the current state is a charged state. On the other hand, the voltage V + as in the second equation is divided by the resistors R14 and R16 to a predetermined level of voltage, for example, a logic “high” level, so that the data of the MPU 202 in the portable device 200 can be divided. It is input to the terminal P3. At this time, the MPU 202 in the portable apparatus 200 recognizes the state of charge by a logic "high" input to the data terminal P3.

By the above operation, each of the fixed device 100 and the portable device 200 recognizes an uncharged state and a charged state by inputting logic states input to the respective data terminals P1 and P3.

The MPU 102, which recognizes each state of charge by the above operation, searches for whether to send the password in step 38 of FIG. If the MPU 102 does not send the password in the search of step 38, the MPU 102 returns to step 34, and if it is to send the password, the MPU 102 indicates whether the data to be sent in step 40 is logical “1”. Search for and transmit the data in the process of FIG. For example, if the data to be transmitted is a logic "1", the MPU 102 outputs a current path control signal of a "high" state to the data terminal P2. If the data to be transmitted is a logic "0", the data terminal ( P2) outputs the current path control signal in the "low" state. In step 42 and 44, the MPU 102 sends data in step 46 to search whether there is more data to be transmitted, and returns to step 34 in the case where there is no more data to be transmitted, and if there is data to be transmitted. In step 40, transmission of data is repeated.

On the other hand, the transistor Q11 which inputs the current path control signal output from the data terminal P2 of the MPU 102 to the base through the resistor R13 has a first voltage terminal according to the logic state of the current path control signal. (104), the third voltage terminal 204, the battery 210, the fourth voltage terminal 206, the second voltage terminal 102 and the path of the charge current of the collector-emitter of the transistor Q11 is switched. . For example, when a current path control signal in a logic "high" state is input, it is switched "on" to form a charging current path as described above, and when a current path control signal in a logic "low" state is input, an "off" switching. To block the passage of the charge current formed as described above.

When the charging current path is formed as described above, the logic “high” signal divided by the resistors R14 and R16 is input to the data terminal P3 of the MPU 202 in the portable device 200. do. At this time, the MPU 202 determines that the data terminal P3 is “high” in FIG. 48, and recognizes the current data input as logic “1” in step 50, and the logic currently recognized in step 54. The data of "1" is stored in the memory (EEPROM) 212, and the process returns to 48.

If the charge current is blocked as described above, the voltage V + across the third and fourth voltage terminals 204 and 106 becomes zero volts, thereby dividing the voltage by the resistors R14 and R16. At 0 volts, a logic "low" signal is input to the data terminal P3 of the MPU 202. In this case, the MPU 202 determines that the data terminal P3 is in a low state in step 48 of FIG. 48, recognizes the current data input as a logic “0” in step 52, and the logic currently recognized in step 54. The data of "0" is stored in the memory (EEPROM) 212 and the process returns to 48.

Therefore, the present invention can facilitate the mechanical design of the wireless telephone by outputting the charging voltage to the two charging voltage terminals and simultaneously transmitting the data by switching the path of the charging current.

As described above, the present invention can simultaneously transmit charging voltage and data to two charging voltage terminals, thereby reducing the number of metal pads respectively installed in the fixed device and the portable device, and facilitating the design of the device. There is this.

Claims (3)

In the power supply circuit of the wireless telephone, the MPU 102 for controlling the operation in the fixed device, the first and second voltage terminals 104 and 106 for outputting the charging voltage, and the second voltage terminal 106. And a current path connected in series between the second voltage GND and switching in response to the current path control signal to form a path of the current, converting the current into a voltage, and outputting a charging signal to the MPU 102. A fixed device 100 having a switching means; Third and fourth pads 204 and 206 for inputting a charging voltage, a battery 210 for charging a charging voltage input to the third and fourth pads 204 and 206, and the third pad ( Voltage dividing means connected between the second voltage terminal 204 and the second voltage terminal to divide the voltage input to the third voltage terminal 204 into a logical voltage of a predetermined level, the third voltage terminal 204 and the battery ( A diode 208 connected between the first and second terminals 204 to be output to the battery 210 in one direction, and operated by an output voltage of the battery 210, the voltage dividing means. The mobile device 200 includes a MPU 202 for receiving secret data by inputting a logic voltage output from the memory device, and a memory 212 for storing data under the control of the MPU 202. Circuit characterized in that. The current path switching means is connected in series between the second voltage terminal 106 and the second voltage GND, and responds to the current path control signal output from the MPU 102. A resistor R12 for switching to form a current path from the second voltage terminal 106 to the second voltage GND, converting the current flowing in the path into a voltage, and outputting the charging signal to the MPU 102; And a transistor (Q11). Between the MPU 102 for controlling the operation in the fixing device, the first and second voltage terminals 104 and 106 for outputting the charging voltage, and between the second voltage terminal 106 and the second voltage GND. A fixed device (100) connected in series and having a current path switching means for switching the current path control signal to form the current path, converting the current into a voltage, and outputting a charging signal to the MPU 102; Third and fourth pads 204 and 206 for inputting a charging voltage, a battery 210 for charging a charging voltage input to the third and fourth pads 204 and 206, and the third pad ( Voltage dividing means connected between the second voltage terminal 204 and the second voltage terminal to divide the voltage input to the third voltage terminal 204 into a logical voltage of a predetermined level, the third voltage terminal 204 and the battery ( A diode 208 connected between the first and second terminals 204 to be output to the battery 210 in one direction, and operated by an output voltage of the battery 210, the voltage dividing means. The portable device 200 includes a MPU 202 for receiving secret data by inputting a logic voltage output from the memory device and controlling the portable device, and a memory 212 for storing data under the control of the MPU 202. A method for transmitting and receiving a password of a cordless telephone, comprising: outputting a current path control signal; And a charging state searching process for searching whether a charging start signal is input, and a data sending process for transmitting a password stored in a storage area when it is determined that the charging state is in the charging state searching process.