JPS60259027A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To disconnect the connection to a telephone line by disconnecting automatically a power supply circuit to a main circuit with a signal from a base set independently of the switching state of a power switch when a handset is hooked onto a base set. CONSTITUTION:When the handset is mounted to the base set while applying a power switch 6, since the power switch 6 is turned on, a power supply application output terminal 9 of a controller 8 goes to a high level and a power supply circuit 12 to the main circuit 7 is turned on, and a DC positive voltage is impressed to a positive terminal 3 of a charging circuit 2 from the base set by hooking on the handset to the base set, then a switching transistor (TR)14 is turned on, the base potential of a drive TR12a for the power supply circuit 12 is grounded so as to be turned off and a switching TR12b is turned off so as to disconnect the power supply circuit 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cordless telephone device comprising a pace set and a handset that is placed on the pace set during standby, and in particular to a power supply circuit for the handset.

[Prior Art] A conventional device of this type is shown in FIG. 1st
The figure is a circuit diagram showing in detail the handset of a conventional cordless telephone device, especially its power supply circuit.
is a rechargeable battery, (2) is a charging circuit for this, and when this handset is placed on a pace set (not shown), the pace set's DC power supply positive and negative terminals (
positive electrode charging terminal (3), negative electrode charging terminal (4) and diode (5) respectively connected to (not shown)
It consists of (6) is a manual power switch, (7)
is the handset main circuit consisting of a transmitter receiver, etc., (8)
is a controller such as a microcomputer, (9) is a main circuit (
7) is a power-on signal output terminal, (10) is an input terminal for inputting the opening/closing signal from the power switch (6), (11) is a power input terminal for the controller (8), and (12) is a driving transistor. (12a), switching transistor (12
b), and the main circuit (
7), the power supply circuit (13) is a controller that steps down the voltage of the battery (1) to a specified voltage of the controller (8) and applies it to the power input terminal (11) of the controller (8); This is a constant voltage circuit for power supply.

Next, its operation will be explained. When the pace set is placed in the pace set, the charging circuit (2
), a pace setting force and a DC power supply voltage are applied to the charging terminals (3) and (4) of the rechargeable battery (1). At this time, the power switch (6) is open, so the controller (8)
), no signal is given to the input terminal (10) of the output terminal (
9), the power-on signal does not appear and becomes Low. Therefore, the power supply circuit (12) is a transistor (12a) (1
2b) is disconnected, and power is not supplied to the main circuit (7). However, the controller (8) has a circuit (13).
Power is constantly supplied by.

The next time I picked up the handset to make a call,
The charging circuit (2) is disconnected and power is supplied only by the battery (1). Then, when the power switch (6) is turned on, a signal is given to the input terminal (10) of the controller (8), and the power-on output terminal (9) becomes High and the power supply circuit (
12) transistors (12a) (12b) are turned on, and power is supplied to the main circuit (7). Controller (8
) is supplied with power regardless of whether the power switch (6) is open or closed.

Therefore, when you start transmitting, the transmitter in the main circuit (7) modulates the transmitter signal with a radio frequency signal and transmits it, which is received by the receiver in the pace set, demodulated, and transmitted through the telephone line. A received signal from the other party is modulated with a radio frequency signal by the transmitter in the pace set, and is received and demodulated by the receiver in the main circuit (7) of the handset. In this case, the main circuit (7) is turned on by turning on the switch (6).
When the power is turned on to the transmitter inside, a signal of a specific frequency f is always sent out from the transmitter of handsera 1~, regardless of whether or not there is a call, and only while this signal is detected by the pace set, The wireless telephone device is configured to be connected to a telephone line. Therefore, when the transmitter of the handset is powered on, the telephone line is connected, and when the transmitter is powered off, the telephone line is disconnected. When the handset is placed on the pace set and the power switch (6) is turned off, if a call signal is received from another party, the pace set's speakerphone will ring to notify the user of the incoming call. , pick up the handset and turn on the power switch (6
) is turned on, the power to the main circuit (7) is turned on, a signal of frequency f is sent out from the transmitter as described above, this is detected by the pace set, and the telephone line is connected.

Since the conventional cordless telephone device is constructed as described above, it often happens that the power switch (6) is left on and forgotten to be turned off, and the handset is placed on the base cell 1-. In this case, the battery (1) will be charged by the charging circuit (2) while supplying current to the main circuit (7), so the power supply from the base cellar 1- will be insufficient and the battery will reach a fully charged state. The problem arose that I couldn't get it. In the above case, the main circuit (7) including the transmitter will remain in a standby state with the power turned on, and the telephone line will remain connected due to the signal of frequency f1 from the transmitter, resulting in a so-called busy state. This resulted in the problem of not being able to receive calls from other subscribers.

[Summary of the Invention] This invention was made to solve the problems of the conventional devices as described above, and when the handset is placed on the pace set, the power supply circuit to the main circuit is connected to the opening and closing of the power switch. Regardless of the situation, by configuring the device to automatically disconnect based on a signal from the pace set, even if you forget to turn off the power switch of the handset and leave it on the pace set in standby mode, the connection to the telephone line will always be disconnected. At the same time, the present invention provides a cordless telephone device that can fully charge the battery of the handset.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

Fig. 2 is a circuit diagram showing only a handset according to an embodiment of the present invention. In Fig. 1, (1) to 13) are exactly the same as those shown in Fig. 1, and (14) is connected to the charging terminal (3). ON by the smoothed DC positive voltage from the base set of
The switching transistor (15) is a current limiting resistor.

Next, in this embodiment, the operation when the handset is placed on the pace set with the power switch (6) turned on will be described. The operations in other cases are the same as those shown in FIG. 1 and will therefore be omitted. In this case, since the power switch (6) is ON, the power supply output terminal (9) of the controller (8) is Hi.
gh, and the power supply circuit (12) to the main circuit (7) is turned on. However, by placing the handset on the pace set, the charging circuit (2) is turned on from the pace set.
), a DC positive voltage is applied to the positive terminal (3) of the transistor (12) for driving the switching (12).
The base potential of a) is grounded and turned OFF, the switching transistor (12b) is turned OFF, and the power supply circuit (12) is disconnected. Therefore, for example, a power switch (
6) If you forget to turn off the power and place the handset on the pace set, the power to the main circuit including the transmitter will be cut off, and the transmitter will operate in a busy state during standby, or if the handset is placed in the pace set while supplying current to the main circuit. Charging status can be prevented.

In the above embodiment, as a means for disconnecting the main circuit power supply circuit (12), the application of the power-on signal from the controller (8) is cut off using a positive potential signal from the charging power supply terminal. Although shown, other means may be used, such as applying a signal from the paceset directly to the controller (8) to suppress generation of the power-up signal.

In addition, although we have shown an example that includes a transmitter and a receiver as the main circuit (7) that cuts off the power supply when placed in the pace set, the speaker of the receiver of the handset can be used as the speaker for receiving calls in the pace set when it is on standby. For devices that require power supply even during standby, such as when used for dual purposes, a power supply circuit separate from that for the main circuit (7) may be provided.

[Effects of the Invention] This invention is configured as described above, and has the effect of preventing the connection to the telephone line during standby and incomplete charging of the handlet battery caused by forgetting to turn off the power switch. have.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a handset in a conventional cordless telephone device, and FIG. 2 is a circuit diagram of a handset 1- in an embodiment of the present invention. In the figure, (1) is the rechargeable battery of the handset, (2)
is the charging circuit for this, (6) is the manual power switch, (7
) is the handset main circuit, (8) is the controller, (12) is the power supply circuit to the main circuit, (14) is the power supply circuit (1
2) It is a switching transistor for disconnection. The same reference numerals in the drawings indicate the same or corresponding parts. Agent Masuo Oiwa (2 people) Figure 1 Figure 2

Claims (2)

[Claims] (1) Consists of a pace set and a handset placed on this pace set while on standby.
A main circuit including a transmitter, a controller such as a microcomputer that provides control signals to this main circuit, a battery that is charged from the pace set when placed in the pace set, and a power-on signal from the controller that turns on the battery. In a cordless telephone device equipped with a power supply circuit from the battery to the main circuit and a manual power switch that inputs a signal that causes the controller to output the power-on signal, when the handset is placed on the pace set, . A cordless telephone device, characterized in that a signal from the pace set disconnects a power supply circuit to the main circuit regardless of whether the manual power switch is opened or closed. (2) A disconnection signal for the power supply circuit of the main circuit is taken out from a charging terminal for the battery when the handset is placed on a pace set. cordless telephone equipment.