JPH05211465A - Charge control circuit for cordless telephone set - Google Patents

Abstract

PURPOSE:To provide a charge control circuit for the cordless telephone set in which the size of a power supply circuit is made small by controlling a charge current to a slave set. CONSTITUTION:This circuit consists of a master set connecting to a telephone line 1 and plural slave sets connecting to the master set respectively by a radio line, and one slave set among the slave sets is a slave set restoration type cordless telephone set in which the slave set is charged in a cradle of the master set, and the system is provided with a charge control section 94 controlling the charge current to the restoration slave set to be stopped or reduced while radio communication with slave sets other than the restoration slave set or while a mechanism 5 for automatic answering telephone function is in operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a master unit connected to a telephone line and a plurality of slave units each of which is connected by a wireless line.
The stand is related to a cordless phone with a cordless handset that is charged on the cradle of the cordless handset. More specifically, by controlling the charging current to the cordless handset, the cordless telephone with a smaller power supply circuit is designed. The present invention relates to a charge control circuit.

[0002]

2. Description of the Related Art A conventional cordless telephone is a return type child placed on a cradle even during wireless communication with a handset other than the return type handset or during an answering machine operation of a mechanism realizing an answering machine function. It was supplying the charging current of the machine as it was.

[0003]

Therefore, the current consumption during wireless communication with a child device other than the return-type child device or the current consumption during operation of the mechanism for realizing the answering machine function becomes the maximum, and therefore the stabilized power supply is used. Alternatively, the power supply circuit including the adapter needs a large-capacity (that is, large-sized) power supply circuit that can tolerate the current consumption.

The present invention has been made in view of the above circumstances, and an object thereof is to perform a wireless communication with a child device other than the return type child device or an operation of a mechanism for realizing an answering machine function.
An object of the present invention is to provide a charging control circuit for a cordless telephone in which the power supply circuit is downsized by stopping or reducing the charging current to the child device placed on the cradle.

[0005]

In order to solve the above-mentioned problems, the charging control circuit of the present invention comprises a master unit connected to a telephone line and a plurality of units each connected to the master unit by a wireless line. A cordless telephone of a cordless handset in which one of the cordless handsets is charged on the cradle of the parent device, and the cordless phone of the cordless phone of the cordless handset includes a cordless handset other than the cordless handset It is configured to include a control unit that controls to stop or reduce the charging current to the return type child device during communication.

Further, the charging control circuit of the present invention comprises a master unit having an answering machine connected to a telephone line, and a plurality of slave units each of which is connected to the master unit by a wireless line. One of the cordless handsets is a cordless telephone of a cordless handset that is charged on the cradle of the cordless handset. It is configured to include a control unit that controls to stop or reduce the charging current.

[0007]

[Operation] While the wireless communication is performed with a child device other than the return type child device, or while the mechanism for the answering machine is operating, the control means performs control to stop or reduce the charging current to the return type child device. To do. This makes it possible to reduce the current consumption during wireless communication with a handset other than the return type handset, or the current consumption during the operation of the mechanism that realizes the answering machine function, which in turn reduces the size of the power supply circuit that supplies power to these. Can be realized.

Further, in a telephone of a type that makes a quick call by lifting the return type handset from the cradle, the detection may be performed by detecting the charge of the handset. In the case of a telephone having such a quick call function, when the charging is completely stopped, it is determined that the handset is lifted from the cradle, and a quick call is made. Therefore, in this case, by reducing the charging current within the detection limit, it is possible to reduce the size of the charging circuit while preventing the malfunction of the quick call.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the electrical construction of the main parts of the cordless telephone of the present invention.

In FIG. 1, an incoming call detection circuit 2 for detecting an incoming call is connected to the telephone line 1, and the output of the incoming call detection circuit 2 is led to an input discriminating section 91. The output of the key input section 7 for performing various operations of the telephone is led to a key input detection circuit 8 for detecting the presence / absence of a key input and determining which key is pressed. Is guided to the input determination unit 91 of the control circuit 9 that controls the operation of the entire parent device.

The control circuit 9 includes an input discriminating section 91,
Radio controller 92, mechanism controller 93, charging controller 9
4 and a main control unit 95 that controls them. The output of the input determination unit 91 is guided to the main control unit 95. In addition, the main controller 95 to the wireless controller 92,
Control signals are output to the mechanism control unit 93 and the charging control unit 94, respectively. The input discriminating unit 91 discriminates an incoming call detection signal from the incoming call detection circuit 2, a handset call signal from the wireless unit 4 and a key input detection signal from the key input detection circuit 8, which will be described later.

On the other hand, a radio unit 4 is connected to the antenna 3 for transmitting and receiving signals to and from a slave unit (not shown), and the output of the radio control unit 92 is guided to the radio unit 4. The output of the wireless unit 4 is guided to the input discriminating unit 91 as a cordless handset calling signal.

A mechanism 5 for realizing an answering machine function
The output of the mechanism drive circuit 6 is guided to the mechanism drive circuit 6, and the output of the mechanism control unit 93 is guided to the mechanism drive circuit 6.

The output of the charge control unit 94 is led to the charging circuit 10 for charging the slave unit mounted on a cradle (not shown).

In the above structure, the control circuit 9 including the input discriminating section 91, the radio control section 92, the mechanism control section 93, the charging control section 94 and the main control section 95 is constituted by a one-chip microcomputer, and the software is used. It is configured to include.

2 and 3 each show a specific circuit configuration example of the charging circuit 10. FIG. 2 is an example of a circuit for completely stopping the charging current supplied to the return type slave unit, and FIG. Each example of the circuit which reduces the charging current supplied to a model child machine is shown.

In FIG. 2, the power supply terminal 31 to which power is supplied from a power supply circuit (not shown) is connected to the emitter of the transistor 33, and the collector is connected to the charging terminal 37a of the charger. The base is connected to the collector of the switching transistor 36 via the base resistor 34.
The emitter of is connected to ground. The base of the switching transistor 36 is connected to the control terminal 32 to which the control signal from the control circuit 9 is supplied via the base resistor 35. The other terminal 37b of the charging terminal 37 is connected to the ground.

In the above structure, when the return type slave unit is charged,
A control signal (H level) from the charging control unit 94 is input to the control terminal 32. This control signal is supplied to the base of the switching transistor 36 via the resistor 35, and a current flows through the base to short-circuit the collector-emitter of the switching transistor 36. That is, the switching transistor 36 is turned on. When the switching transistor 36 is turned on, a current flows through the base resistor 34 to the base of the transistor 33, and the emitter-collector of the transistor 33 is short-circuited to be turned on. At this time, since a power supply voltage is applied to the power supply terminal 31 from a power supply circuit (not shown), this applied voltage is applied to the charging terminal 37a via the transistor 33, which causes the internal battery of the return type slave unit to operate. Will be charged.

On the other hand, when canceling the charging control of such a return type slave unit, an L level control signal is input from the charging control unit 94 to the control terminal 32. Therefore, the base current flowing through the resistor 35 stops flowing, and the collector-
The emitter is opened and the switching transistor 36 is opened.
Turns off. When the switching transistor 36 is turned off, the base resistor 34
Since the base current of the transistor 33, which has been flowing through the transistor 33, stops flowing, the emitter-collector of the transistor 33 is opened and the transistor 33 is turned off. Therefore, the power supply voltage applied to the power supply terminal 31 is stopped from being supplied to the charging terminal 37a by the transistor 33, and the internal battery of the return type slave unit is no longer charged.

Further, the charging circuit 10 shown in FIG. 3 has a structure in which a current limiting resistor 38 is connected between the emitter and collector of the transistor 33 in the charging circuit 10 shown in FIG. The resistance value of the resistor 38 is set to a value such that when the transistor 33 is turned off, the minimum current that prevents the quick call function from malfunctioning is supplied to the charging terminal 37a. That is, the charging circuit 10 shown in FIG. 3 is a charging circuit applied to a telephone having a quick call function.

In the above structure, when the return type slave unit is charged,
A control signal (H level) from the charging control unit 94 is input to the control terminal 32. This control signal is supplied to the base of the switching transistor 36 via the resistor 35, and a current flows through the base to short-circuit the collector-emitter of the switching transistor 36. That is, the switching transistor 36 is turned on. When the switching transistor 36 is turned on, a current flows through the base resistor 34 to the base of the transistor 33, and the emitter-collector of the transistor 33 is short-circuited to be turned on. At this time, since a power supply voltage is applied to the power supply terminal 31 from a power supply circuit (not shown), this applied voltage is applied to the charging terminal 37a via the transistor 33, which causes the internal battery of the return type slave unit to operate. Will be charged.

On the other hand, when canceling the charging control of such a return type slave unit, an L level control signal is input from the charging control unit 94 to the control terminal 32. Therefore, the base current flowing through the resistor 35 stops flowing, and the collector-
The emitter is opened and the switching transistor 36 is opened.
Turns off. When the switching transistor 36 is turned off, the base resistor 34
Since the base current of the transistor 33, which has been flowing through the transistor 33, stops flowing, the emitter-collector of the transistor 33 is opened and the transistor 33 is turned off. Therefore, the power supply voltage applied to the power supply terminal 31 is applied to the charging terminal 37a via the resistor 38, and the internal battery of the return type child device is charged by the charging current limited by the resistor 38. Become. That is, the charging current at this time is smaller than the charging current at the normal time, but has a current value not so small as to operate the quick call function.

Next, the operation of the cordless telephone having the above-mentioned configuration for controlling the charging of the slave unit is performed. (1) When a call signal is sent from the telephone line 1, When the key related to outgoing call is pressed, (3)
This will be described with reference to the flowcharts of the slave unit charge control shown in FIG. 4 and FIG. 5 separately when a key for playing / recording, which is a mechanism operation key of the key input unit 7, is pressed.

(1) When a call signal is sent from the telephone line 1 When a call signal is sent from the telephone line 1, the incoming call detection circuit 2 detects this and the incoming call detection signal is input to the discrimination section 91. To send to. The input discriminating unit 91 recognizes that it is in the incoming state by the incoming call detection signal, and sends a discrimination signal indicating that the line is in the incoming state to the main control unit 95.

When the main control unit 95 receives the discrimination signal indicating the line incoming state (step S1), it sends the external line incoming information to the wireless control unit 92 to the slave units including the return type slave unit for wireless transmission. Control is performed (step S2). That is, the wireless control unit 92 controls the wireless unit 4 to transmit the external line incoming call information to each slave, and transmits the external line incoming call information from the antenna 3. Receiving the outside line incoming information, each child device outputs a ringing tone of the outside line incoming from the buzzer.

Further, the main control section 95 controls the charging control section 94 to stop or decrease the charging current at the same time as the transmission of the outside line incoming information (step S2). That is,
The charging control unit 94 sends a signal (L level signal) for controlling the charging current for the return type slave unit to the charging circuit 10, and the charging circuit 10 receives this L level control signal,
Control is performed to stop or reduce the charging current. That is, the charging circuit 10 shown in FIG. 3 is used to stop the charging current, and the charging circuit 1 shown in FIG. 4 is used to reduce the charging current.
Charge control is performed with 0.

On the other hand, during such charging control, when the wireless communication is stopped by terminating the outside line call by the child device other than the return type child device, the charging control unit 94 outputs an H level control signal indicating a normal charging state. Is input to the control terminal 32 of the charging circuit 10 (steps S3 and S4). As a result, the charging circuit 10 returns to the normal charging state.

(2) When a key for transmitting radio waves such as an extension call key of the key input unit 7 is pressed. For example, when an extension call key of the key input unit 7 is pressed, this key operation is detected by the key input detection circuit 8. The key input signal is detected and the input determination unit 91
Output to. The input discrimination unit 91 recognizes that the telephone call is an extension telephone call based on the key input signal, and sends a discrimination signal indicating that the telephone call is an extension telephone call to the main control unit 95.

When the main control unit 95 receives the discrimination signal indicating the extension call (step S1), the main control unit 95 wirelessly transmits the signal.
The wireless control unit 92 is controlled to transmit the extension call information to the handset including the return type handset (step S2). That is, the wireless control unit 92 controls the wireless unit 4 to transmit the extension call information to each slave, and transmits the extension call information from the antenna 3. Each cordless handset receives this extension call information and determines whether the information is information that specifies itself. As a result, the extension communication path with the subsequently designated child device is set.

Further, the main controller 95 controls the charging controller 94 to stop or reduce the charging current at the same time as the transmission of the extension call information (step S2). That is,
The charging control unit 94 sends a signal (L level signal) for controlling the charging current for the return type slave unit to the charging circuit 10, and the charging circuit 10 receives this L level control signal,
Control is performed to stop or reduce the charging current. That is, the charging circuit 10 shown in FIG. 3 is used to stop the charging current, and the charging circuit 1 shown in FIG. 4 is used to reduce the charging current.
Charge control is performed with 0.

On the other hand, during such charging control, when a slave unit other than the return type slave unit ends the extension call and the wireless communication is stopped, the charge control unit 94 indicates the normal charging state H.
The level control signal is input to the control terminal 32 of the charging circuit 10 (steps S3 and S4). As a result, the charging circuit 10 returns to the normal charging state.

(3) When a key for playing / recording, which is a mechanism operation key of the key input section 7, is pressed.

When a key for playing / recording, which is a mechanism operation key of the key input section 7, is pressed, the key input detection circuit 8 detects this key operation and outputs a key input signal to the input determination section 91. The input discriminating unit 91 recognizes the mechanical operation by the key input signal, and sends a discriminating signal indicating the mechanical operation to the main control unit 95.

When the main control unit 95 receives the determination signal indicating the mechanism operation (step S11), the mechanism 5
Control to cause the mechanism control unit 93 to perform a designated mechanism operation (step S1).
2). That is, the mechanism control unit 93 outputs a drive control signal to the mechanism drive circuit 6 to operate the mechanism drive circuit 6 to control the mechanism 5.

At the same time as this mechanism operation control, the main controller 95 controls the charging controller 94 to stop or reduce the charging current (step S12). That is, the charging control unit 94 sends a signal (L level signal) for controlling the charging current for the return type slave unit to the charging circuit 10, and the charging circuit 10 receives the L level control signal and receives the charging current. Is controlled to stop or decrease. That is,
Charging control is performed by the charging circuit 10 shown in FIG. 3 when the charging current is stopped, and by the charging circuit 10 shown in FIG. 4 when the charging current is reduced.

On the other hand, when the mechanism operation control is completed during such charging control, the charging control unit 94 outputs an H level control signal indicating a normal charging state.
Is input to the control terminal 32 (steps S13, S1).
4). As a result, the charging circuit 10 returns to the normal charging state.

[0038]

Since the charging control circuit of the cordless telephone according to the present invention is configured to stop or reduce the charging current for the return type slave unit during wireless communication or during operation of the mechanism, the current consumption of the cordless telephone body is reduced. Can be reduced, and the power supply circuit can be downsized accordingly. Further, there is an effect that heat generation in the main body of the cordless telephone can be suppressed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a main part of a cordless telephone of the present invention.

FIG. 2 is a specific circuit configuration diagram of a charging circuit when the charging current supplied to the return type slave unit is completely stopped.

FIG. 3 is a specific circuit configuration diagram of a charging circuit when the charging current supplied to the return type slave unit is reduced.

FIG. 4 is a flowchart of slave unit charging control when performing wireless communication with a slave unit other than the return type slave unit.

FIG. 5 is a flowchart of slave unit charging control when a mechanism for an answering machine function is operating.

[Explanation of symbols]

 1 Telephone line 5 Mechanism 10 Charging circuit 91 Input discriminating unit 94 Charging control unit 95 Main control unit

Claims (2)

[Claims] 1. A master unit connected to a telephone line and a plurality of slave units each connected to the master unit by a wireless line, one of the slave units being a cradle of the master unit. In the cordless telephone of the cordless handset that is charged above, while performing wireless communication with the cordless handset to the cordless handset other than the cordless handset, the charge current to the cordless cordless handset is stopped or A charging control circuit for a cordless telephone, which is provided with a control means for performing a control for decreasing. 2. A master unit having an answering machine connected to a telephone line, and a plurality of slave units each connected to the master unit by a wireless line. One of the slave units is In a cordless telephone of a cordless handset that is charged on the cradle of the parent device, a control that stops or reduces the charging current to the return type child device while the mechanism for the answering machine is operating in the parent device. A charging control circuit for a cordless telephone, comprising: