JPH0324850A - Radio telephone equipment - Google Patents

Abstract

PURPOSE:To prevent unnecessary consumption of a battery in a radio telephone set by detecting whether a prescribed charging voltage or a voltage lower than the battery voltage is inputted or not on the radio telephone set side and performing the clearing processing at the time of detecting the input of either voltage. CONSTITUTION:When a radio telephone set 2 is placed with a charger in the operated state, the prescribed charging voltage is applied to the radio telephone set 2, and this application is detected by a second detecting means 40 to execute the clearing processing by a control means 38 in the radio telephone set 2. Though a commercial AC power is not supplied to the charger 5 and it is in the unoperated state, a potential lower than the battery output voltage is applied to the radio telephone set 2 through a resistance 58 connected between the charging voltage output terminal of the charger 5 and the earth potential terminal when the radio telephone set 2 is placed on the charger 5. Therefore, this application is detected by a first detecting means 36 to execute the clearing processing by the control means 38. Thus, the clearing processing is executed independently of the operated or unoperated state of the charger to open a wire line 3 when the radio telephone set 2 is placed on the charger.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a wireless telephone device typified by a cordless telephone device.

(Prior Art) Conventionally, wireless telephone devices have been known that include a parent device connected to a wired telephone line and a wireless telephone connected to the parent device via a wireless line. In such wireless telephone devices, a rechargeable battery is used as a power source for operation because the wireless telephone can make calls at a free location away from the parent device, and this battery is either inside the parent device or connected to the parent device. It is charged using a separate charger. Specifically, by placing the wireless telephone on the charger, the charging voltage input terminal of the wireless telephone and the charging voltage output terminal of the charger are electrically connected.
The battery within the radiotelephone is charged through these terminals.

By the way, many of these types of wireless telephone devices are configured so that off-book operations when making/receiving calls and on-hook operations when ending calls are performed by operating push-button switches. Taking advantage of the fact that a wireless telephone is placed on a charger and placed in a charging state, once the battery inside the wireless telephone is in a charging state, the control circuit within the wireless telephone is considered to have terminated the call. There are some devices that perform call termination processing and automatically release the connection to the wired telephone line without operating a switch.

(Problem to be Solved by the Invention) However, in the above-mentioned wireless telephone device, the fact that the wireless telephone is placed on the charger cannot be detected by the fact that the charging voltage from the charger is applied or the charging current starts flowing. Since the charger's power cord is connected to a commercial AC power source (
When the wireless telephone is not connected to the wireless telephone (ACIOOV) or during a power outage, the charger itself is not operating, and it becomes impossible to detect that the wireless telephone is placed on the charger.

As a result, the control circuit within the wireless telephone cannot proceed to call termination processing, causing the wired telephone line to remain in use unnecessarily and the battery within the wireless telephone to be unnecessarily consumed. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless telephone device that can correctly detect that a wireless telephone is in a placed state even when commercial AC power is not supplied to a charger.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a method for connecting a resistor between a charging voltage output terminal and a ground potential terminal of a charger, and reducing the voltage applied to the charging voltage input terminal of the wireless telephone. a first detection means for monitoring the applied voltage and detecting that the applied voltage has become lower than the battery output voltage; a second detection means for detecting the occurrence of a problem by the voltage applied to the charging voltage input terminal; and control for performing call termination processing in response to input of a detection output signal from either of the first and second detection means. The invention is characterized in that it is provided with means.

(Function) In the present invention, when a wireless telephone is placed on the charger while it is in an operating state, a predetermined charging voltage is applied to the wireless telephone. The control means executes call termination processing. On the other hand, even if commercial AC power is not supplied to the charger and it is in a non-operating state, if a wireless telephone is placed on this charger, there will be a gap between the charger's charging voltage output terminal and the ground potential terminal. Since a potential lower than the battery output voltage is applied to the wireless telephone via the connected resistor, the first detection means detects this and causes the control means to execute call termination processing.

As a result, regardless of whether the charger is in operation or not, when the wireless telephone is placed on the charger, the call termination process is executed and the wired line can be released.

(Embodiment) FIG. 1 is a block diagram showing the overall configuration of a wireless telephone device according to the present invention, in which a parent device 1 is connected to a wireless telephone 2 via a wireless line, and is also connected to a wired line 3.

The parent device 1 includes a line switch 10 and a hybrid circuit 1.
1, 16Hz calling signal detection circuit 12, receiver 13,
Reception electric field detection circuit 14, identification signal detection circuit 15, transmitter 16, synthesizer 17, transmission antenna 18, one reception antenna, control circuit 20, AC from AC plug 4
It has a rectification stabilization circuit 21 that rectifies 100V.

On the other hand, the radio telephone 2 includes a receiving antenna 22 and a receiver 23.
, received electric field detection circuit 24, identification signal detection circuit 25, transmitter 26, transmitter 27, synthesizer 28, two speakers, receiver 30, light emitting diode 31, hook switch 3
2. Dynal key 33, rechargeable battery 34, transmitting antenna 35, end of call detection circuit 36, charging voltage input terminal 37a
37b, a control circuit 38, three logic circuits, and a charge detection circuit 40.

Further, the charger 5 that charges the battery 34 of the wireless telephone 2 is
A rectifier circuit 50 that rectifies ACIOOV input from the AC plug 6, a current limiting resistor 51, and a charging voltage output terminal 52.
a, 52b% A resistor 53 is connected between these terminals 52a and 52b.

In the above structure, first, normal call originating and receiving operations will be explained.

When the parent device l detects a paging signal from the wired line 3 in the paging signal detection circuit 12 during standby, it sets the oscillation frequency of the synthesizer 17 to the control channel frequency, and transmits it to the transmitter 16.
Turn on and transmit an incoming signal. In this case, the incoming signal includes a signal specifying the communication channel (S-CH).

On the other hand, during standby, the radio telephone 2 turns on the synthesizer 28 for a certain period of time, sets its oscillation frequency to the control channel frequency, and turns on the receiver 23.

At this time, when an incoming call signal is received, the transmitter 27 is turned on, sends an incoming call response signal containing an identification signal (ID code) assigned to itself, and is sent to the communication channel (S- CH).

When the receiving electric field detection circuit 14 detects the radio wave from the wireless telephone 2, the parent device 1 stops sending out the incoming signal. next,
When the ID code included in the incoming call response signal matches,
Switch to the S-CH specified by the incoming signal. Here,■
If the D codes do not match, the response is from another set of wireless telephones, so the system waits until there are no more calls from the wired line 3 and returns to standby mode.

After switching to S-CH, the parent device 1 sends out a bell ringing signal. When the wireless telephone 2 receives this, it sends out a ringing tone from two speakers. Therefore, when an off-hook operation is performed by the hook switch 32 in response to this,
The wireless telephone 2 sends an off-hook signal and enters a talking state.

On the other hand, when the parent device 1 receives the off-hook signal, it stops outputting the bell ringing signal, turns on the line switch 10, forms a call loop with the wired line 3, and enters a call state.

On the other hand, the operation when making a call from the wireless telephone 2 is as follows. That is, when an off-hook operation is performed using the hook switch 32 to make a call to the wired line 3, the control circuit 38 locks the oscillation frequency of the synthesizer 28 to the control channel, turns on the receiver 23, and switches the control channel (C -CH) to receive radio waves. Then, the electric field strength of the received radio waves on the control channel is detected by the detection signal of the received electric field detection circuit 24, and if the received electric field strength is not above a certain value, it is determined that the control channel is vacant, and the transmitter 27 is turned on. A call signal containing the ID code assigned to the user is transmitted. On the other hand, the master device 1 monitors the presence or absence of received radio waves on the control channel, but when it receives a calling signal from the wireless telephone 2,
Based on the output of the identification signal detection circuit 15, whether or not the ID code therein matches the ID code assigned to the combination with the wireless telephone 2. If they match, the transmitter 16 is turned on to cause the wireless telephone 2 to transmit a call response signal (including ID code and S-CH designation information).

The radio telephone 2 receives the call response signal from the parent device 1 on the control channel, and determines whether the ID code contained therein matches its own based on the output of the identification signal detection circuit 25. If they match, the oscillation frequency of the synthesizer 28 is switched to the frequency of the communication channel designated by the parent device 1. On the other hand, after the parent device 1 also transmits the call response signal, it switches the oscillation frequency of the synthesizer 17 to the frequency of the call channel designated for the call.

As a result, the parent device 1 and the wireless telephone 2 are connected to the parent device 1.
is connected to the designated communication channel, and by subsequent dialing operation using the dial key 33, the telephone connected to the wired line 3 can be called and put into a conversation state.

Next, the power supply system will be explained.

First, the parent device 1 connects the AC power supply to the commercial AC power supply (ACIOOV).
Connect plug 4 and use ACIOOV with rectifier stabilization circuit 21.
A DC power supply that has been rectified and stabilized is used as the operating power supply. Furthermore, the radio telephone 2 uses the DC power stored in the battery 34 as a power source for operation. Furthermore, the charger 5 connects the AC plug 6 to ACIOOV, and outputs the DC power obtained by rectifying this with the rectifier circuit 5o as the charging voltage for the battery 34 of the wireless telephone 2 via the charging voltage output terminals 52a and 52b. There is.

The charging voltage output from the output terminals 52a, 52b is supplied to the battery 34 via the charging detection circuit 40.

Next, the operation when the wireless telephone 2 is placed on the charger 5 during a call will be described.

First, when the wireless telephone 2 is placed on the charger 5, the charging voltage output terminals 52a, 52b and the charging voltage input terminals 37a, 3
7b becomes electrically connected, and the output terminals 52a. 52
The charging voltage output from the terminal b is supplied to the battery 34 via the charging detection circuit 40, and charging of the battery 34 is started.

At this time, the end of call detection circuit 36 and the charge detection circuit 40 detect the start of charging due to the flow of charging current to the battery 34, and input the detection output to the logic circuit 39. The three logic circuits determine that a call-end operation has been performed when both the charging detection circuit 40 and the end-of-call detection circuit 36 are generating a detection output, or when both are not generating a detection output. The control circuit 38 is configured to input the determination output to the control circuit 38.

Therefore, the logic circuit 39 receives both the detection outputs from the end of call detection circuit 36 and the charging detection circuit 40, so that
A determination output indicating that a call termination operation has been performed is input to the control circuit 38. Then, the control circuit 38 transmits a call termination signal to the parent device 1 via the wireless line, and returns to the standby state.

On the other hand, upon receiving the call termination signal, the parent device 1 turns off the line switch 10, opens the wired line 3, and enters the call termination state.

Next, the operation when the wireless telephone 2 is placed on the charger 5 while ACIOOV is not being supplied to the charger 5 will be described.

In this case, no charging voltage is output from the charger 5, and the input terminal 37a is connected to the ground potential through the resistor 53.

Therefore, no charging current flows to the battery 34, and the input terminal 3
The potential of 7a is less than the output voltage of battery 34. Therefore, both the end of call detection circuit 36 and the charge detection circuit 40 do not generate detection outputs. The logic circuit 39 determines that a call termination operation has been performed when both detection outputs are not generated, and inputs the determination output to the control circuit 38. As a result, a call end signal is transmitted from the wireless telephone 2, and the call ends.

Therefore, regardless of whether the charger 5 is in operation or not, by placing the wireless electric device 2 on the charger 5, it is possible to end the call.

FIG. 2 is a detailed circuit diagram showing only the charging system from the charger 5 to the battery 34.
It is also input to the battery 34 via a resistor 41 and a diode 42 for preventing backflow. In addition,
A resistor 43 is connected in parallel to a series body of resistor 41 and diode 42 .

The end of call detection circuit 36 and the charging detection circuit 4o are connected to the human sword terminal 37.
The end of call detection circuit 36 detects that the voltage applied to the input terminal 37a is higher than the output voltage of the battery 34, and the charge detection circuit 36 detects the voltage level applied to the input terminal 37a. 40 detects that the voltage applied to the input terminal 37a is equal to or higher than the output voltage of the charger 5;
Its detection level is set. However, the relationship is charging voltage > battery voltage.

Therefore, when the wireless telephone 2 is placed on the charger 5 while it is in operation, both detection circuits 36 and 40 will generate detection outputs. However, when the charger 5 is not in operation, both detection circuits 36 and 40 detect the output voltage of the battery 34 through the resistors 53 and 43.
Since the voltage divided by
Both 6 and 40 generate no detection output. On the other hand, when the wireless telephone 2 is removed from the charger 5, the voltage of the power terminal 37a becomes the same as the output voltage of the battery 34, so only the end of call detection circuit 36 generates a detection output.

The three logic circuits utilize the detection characteristics of both of these detection circuits 36 and 40, and determine whether a call termination operation is performed when both detection outputs are generated or when both detection outputs are not generated. The judgment output is sent to the control circuit 3.
Enter 8.

FIG. 3 is a circuit diagram showing a specific example of the end-of-call detection circuit 36 and the charging detection circuit 40. When the wireless telephone 2 is placed on the charger 5, if the charger 5 is in operation, the input terminal 3
If the photocoupler 400 connected to the input terminal 37a in the forward direction is turned on and the charger 5 is inactive, the photocoupler 360 connected to the input terminal 37a in the reverse direction is turned on. on the other hand,
When the wireless telephone 2 is not placed on the charger 5, neither of the photocouplers 360 and 400 is turned on. Therefore, by configuring the three logic circuits with an OR gate 390 and inputting the output signal of the photocoupler 360.400 to this OR gate 390, the call termination operation can be performed regardless of whether the charger 5 is in operation or not. A signal indicating ? can be obtained from the output of OR gate 390.

The circuit shown in FIG. 3 detects a call termination operation based on the direction of the current flowing to the battery 34, but as explained in FIG. 2, the detection levels of the two detection circuits 36 and 40 can be made different. It is also possible to detect a call-end operation.

FIG. 4 is a circuit diagram showing a specific example thereof, in which the call end detection circuit 36 is composed of a transistor 361 and resistors 362 to 364, and the input terminal 37 is connected to the resistors 362 and 363.
A detection level is set to determine whether the applied voltage of a is equal to or higher than the voltage of the battery 34.

The charge detection circuit 40 also includes a transistor 401 and a resistor 4.
02 to 404, and a detection level for determining whether the voltage applied to the input terminal 37a is equal to or higher than the output voltage of the charger 5 is set by the resistors 4o2 and 403. Further, the three logic circuits are constituted by an exclusive OR gate 391 and an inverter 392, and are configured such that the output of the inverter 392 is sent out as a call end determination output.

According to this configuration, the outputs of the detection circuits 36 and 40 and the logic circuit 39 have the relationship shown in Table 1 below, and as described above, the call termination operation can be performed regardless of whether the charger 5 is in operation or not. It is possible to detect that the wired line 3 has been disconnected and release the wired line 3.

Table 1 (However, H-detection output is "present" and L-detection output is "absent") [Effects of the invention] As explained above, in the present invention, a resistor connected to the ground potential is connected to the charging voltage output terminal of the charger. Connect it and
Is the specified charging voltage input on the wireless phone side?
It detects whether a voltage lower than the battery voltage is being input, and when either of these two conditions is met, it determines that the wireless phone is placed on the charger and executes call termination processing. Therefore, regardless of whether the charger is in operation or not, by placing the wireless telephone on the charger, the call termination process can be executed and the wired line can be released.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing an embodiment of the present invention, Fig. 2 is a circuit diagram showing the detailed structure of a battery charging system, and Fig. 3 is a specific example of a call end detection circuit and a charging detection circuit. Circuit diagram shown, 4th
The figure is a circuit diagram showing another specific example of the end-of-call detection circuit and the charging detection circuit. 1... Parent device, 2... Wireless telephone, 3... Wired line, 4.6... AC plug, 5... Charger, 34...
...Battery, 36...Call end detection circuit, 37a, 37b.
...Charging voltage input terminal, 38...Control circuit, three...
- Logic circuit, 40... Charging detection circuit, 50... Rectifier circuit, 52a, 52b... Charging voltage output terminal, 53.
...Resistance, 360,400...Photocoupler, 390
...OR gate, 391...Exclusive OR gate. Figure 2

Claims (1)

[Scope of Claims] The device consists of a parent device connected to a wired line, a wireless telephone connected to the parent device via a wireless line, and a charger for charging a battery built into the wireless telephone. , wherein the wireless telephone device is configured to shift to a call termination process and open a wired line when the wireless telephone is in a charging state from a charger, wherein a charging voltage output terminal and a ground potential terminal of the charger are connected to each other. a first detection means for connecting a resistor between the terminals of the radio telephone, monitoring the voltage applied to the charging voltage input terminal of the radio telephone, and detecting that the applied voltage has become lower than the battery output voltage; a second detection means for detecting a state in which a predetermined charging voltage is applied from the charger to the charging voltage input terminal based on the voltage applied to the charging voltage input terminal; and these first and second detection means. 1. A wireless telephone device comprising: a control means for performing call termination processing upon input of a detection output signal from either one of the above.