JPH10313366A - Cordless modem repeater system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption consumed in a power supply voltage boosting circuit in a slave set of the cordless modem repeater system, even in the standby state. SOLUTION: The system is made up of a set of a slave set 21 that is connected to a line with a modem and a master set 25, the slave set 21 is provided with a battery 11 and a power supply voltage booster circuit 13 that boosts the voltage of the battery and supplies power to the modem, a current detection circuit 17 detecting a current to the modem and with a supply power switching device 12 controlled by a CPU 20. In this case, the battery 11 supplies power directly to the modem in the standby state, the supply power switching device 12 shuts power supply to the power supply voltage boosting circuit 13, and the supply power switching device 12 is used to supply power to the power supply voltage boosting circuit 13 in the case of communication by the modem.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a set of a slave unit connected to a modem and a line, and a set of a base unit connected cordlessly to the slave unit and connected to a telephone line. More particularly, the present invention relates to a cordless modem relay device configured to supply power to a modem.

[0002]

2. Description of the Related Art Conventionally, a slave unit connected to a modem through a line,
In a cordless modem relay device that is configured with a set of a base unit that is cordlessly connected to the slave unit and connected to a telephone line and that supplies power to the modem from a battery in the slave unit, a line connection request from the modem is provided. In order to detect this, the line voltage is supplied to the modem even during standby. Also, in order to supply the line current to the modem during communication, the voltage directly from the battery is too low, so the line voltage to the modem should be supplied by boosting the battery power with the power supply voltage booster circuit. I have. Then, the power supply voltage boosting circuit operates even during standby.

A conventional cordless modem relay device will be described below with reference to the drawings. FIG. 2 is a configuration diagram of a conventional cordless modem relay device. The main components include a modem, a slave unit 6 connected to the modem via a line, and a master unit 10 capable of cordless communication with the slave unit 6. .

The slave unit 6 includes a battery 1 as a constituent element,
A power supply voltage boosting circuit 2 for boosting the voltage of the battery 1; a signal processing circuit 3 for amplifying a transmission / reception signal to a modem;
It comprises a unit 4 and a CPU 5 for controlling each component.

On the other hand, base unit 10 has a line connection portion 7 for connecting to a telephone line, a signal processing circuit 8 for amplifying an audio frequency band signal for communication between the telephone line and the modem, and a modem for modulating and demodulating the audio frequency band signal. And an RF unit 9 for converting an audio frequency band signal and a high frequency signal.

The operation of the power supply system of a conventional cordless modem relay device having the above-described components will be described. In the slave unit 6 of the cordless modem relay device, the voltage is supplied from the battery 1 to the modem using the power supply voltage boosting circuit 2 even during standby. When the modem performs communication, the line current is supplied from the power supply voltage booster circuit 2 and the modem performs normal communication. Further, even when the modem terminates the communication, disconnects the line, and enters a standby state, power is supplied to the power supply voltage boosting circuit 2.

[0007]

As described above, in the conventional cordless modem relay device, the operating current is consumed by the power supply voltage boosting circuit 2 even when the slave unit 6 is in standby, so that the battery 1 is consumed and the standby time is reduced. And the operation time is shortened.

The present invention has been made in consideration of the above-described conventional problems, and has as its object to realize a cordless modem relay apparatus that can reduce current consumption during standby, reduce battery consumption, and extend operating time.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a battery to a slave unit, a power supply voltage boosting circuit for boosting the voltage of the battery and supplying power to a modem, and And a power supply switching device controlled by a CPU, which supplies power directly to the modem from the battery during standby and controls the power supply switching device to increase the power supply voltage. A cordless modem relay device provided with means for interrupting supply of power to a circuit and controlling the power supply switching device during modem communication to supply power to a power supply voltage booster circuit.

According to the present invention, the line request from the modem is detected by the current detection circuit directly connected from the battery without using the power supply voltage boosting circuit. Power consumption can be saved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is based on a set of a slave unit connected to a modem and a line and a master unit connected cordlessly to the slave unit and connected to a telephone line. The slave unit includes a battery, a power supply voltage boosting circuit for boosting the battery voltage and supplying power to the modem, a signal processing circuit for amplifying a communication signal to the modem, an audio frequency band signal for modulating / demodulating the signal, and a high frequency signal. An RF unit for converting a signal,
A cordless modem relay device having a CPU for controlling each component device, wherein the slave unit is provided with a current detection circuit for detecting a line current to the modem and a power supply opening / closing device controlled by the CPU. Power is supplied directly to the modem from the battery, and the supply of power to the power supply voltage boosting circuit is controlled by controlling the power supply switching device, and the power supply switching device is controlled during modem communication by controlling the power supply switching device. A cordless modem relay device provided with a means for supplying power to a circuit, having an effect of reducing current consumption during standby, reducing battery consumption and extending operating time.

According to a second aspect of the present invention, in the cordless modem relay device according to the first aspect, a diode is provided in a circuit for directly supplying power to the modem from a battery, and a diode is provided from the power supply voltage boosting circuit to the modem. The power supply circuit is provided with a diode, so that no voltage is applied to the power supply voltage booster circuit from the line side by the diode when power is cut off by the power supply switchgear, and the battery is directly connected to the line during modem communication. The diode does not apply the boosted power supply voltage to the connected circuit, thereby preventing the circuit from being damaged.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a configuration diagram of a cordless modem relay apparatus according to Embodiment 1 of the present invention.

The cordless modem relay device comprises a modem as a main component and a slave 2 connected to the modem via a line.
1 and a base unit 25 capable of cordless communication with the slave unit 21. The slave unit 21 includes a battery 11 as a component, a power supply voltage boosting circuit 13 for boosting the voltage of the battery 11, and a modem. A signal processing circuit 18 for amplifying the transmission / reception signal of the RF signal, an RF unit 19 for modulating / demodulating the signal to convert an audio frequency band signal and a high frequency signal, and a C controlling each component.
A master unit 25 includes a PU 20, a line connection part 22 for connecting to a telephone line, a signal processing circuit 23 for amplifying an audio frequency band signal for communication between the telephone line and the modem, and a modem for modulating and demodulating the audio frequency band signal. It is the same as the above-described conventional example in that it is configured with the RF unit 24 that converts an audio frequency band signal and a high-frequency signal.

The feature of the first embodiment is that the slave unit 21
, A power supply switchgear 12 for controlling opening and closing of power supply from the battery 11 to the power supply voltage booster circuit 13, a diode 14 for applying boosted power to a line to a modem, and detection for detecting a load current of the boosted power supply A circuit 15, a diode 16 for applying a voltage from the battery 11 to the line to the modem, and a detection circuit 17 for detecting a power supply current from the battery 11 to the line are provided, and these are also controlled by the CPU 20. .

The operation of the power supply system of the cordless modem relay device configured as described above will be described below.

The slave unit 21 of the cordless modem relay device includes:
During standby, a voltage is directly supplied from the battery 11 to the modem without using the power supply voltage boosting circuit 13, and at this time, the power supply voltage boosting circuit 13 cuts off the power supply by the power supply switching device 12 controlled by the CPU 20. Has not been working. Further, since no voltage is applied from the line side to the power supply voltage boosting circuit 13 by the diode 14, damage to the circuit can be prevented.

When the modem starts communication and draws the line current to connect the line, the current detection circuit 17 operates, the CPU 20 detects the signal, and closes and controls the power supply switching device 12 to control the power supply voltage. Power is supplied to the booster circuit 13. The line current is supplied from the power supply voltage boosting circuit 13, and the modem can normally communicate. At this time, since the power supply voltage increased by the diode 16 is not applied to the circuit directly connected to the line from the battery 11, damage to the circuit can be prevented.

When the modem terminates the communication, disconnects the line and enters a standby state, the line current detecting circuit 17 detects the interruption of the current, and interrupts the power supply to the power supply voltage boosting circuit 13. Therefore, the power supply voltage booster circuit 13 does not operate during standby, does not consume unnecessary current during standby, and can detect line current.

As described above, according to the first embodiment, it is possible to provide a cordless modem relay apparatus in which the current consumption during the standby time is reduced and the operation time is extended.

[0021]

As is apparent from the above description, the cordless modem relay device of the present invention supplies power directly to the modem from the battery during standby, and controls the power supply switching device to supply power to the power supply voltage booster circuit. Cut off the power supply of
A means for controlling the power supply switching device during modem communication to supply power to the power supply voltage booster circuit is provided, so that power consumed by the power supply voltage booster circuit during standby can be saved, and a cordless modem relay having a long operation time can be provided. Realizing the device, its effect is great.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a cordless modem relay device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional cordless modem relay device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Battery 12 Power supply switchgear 13 Power supply voltage booster circuit 14 Diode 15 Detection circuit 16 Diode 17 Detection circuit 18 Signal processing circuit 19 RF unit 20 CPU 21 Remote unit 22 Line connection part 23 Signal processing circuit 24 RF unit 25 Base unit

Claims (2)

[Claims] 1. A slave unit connected to a modem through a line, and a set of a base unit connected cordlessly to the slave unit and connected to a telephone line, wherein the slave unit includes a battery and a battery voltage booster. Power supply voltage booster circuit that supplies power to the modem
A signal processing circuit for amplifying a communication signal to the modem; and a signal processing circuit for modulating and demodulating the signal to convert between a voice frequency band signal and a high frequency signal.
An F unit and a cordless modem relay device having a CPU for controlling each component device, wherein the slave unit includes a current detection circuit for detecting a line current to the modem, and a power supply switching device controlled by the CPU. In the standby mode, power is directly supplied from the battery to the modem during standby, and the supply of power to the power supply voltage booster circuit is controlled by controlling the power supply switching device, and the power supply switching device is controlled during modem communication. And a means for supplying power to a power supply voltage boosting circuit. 2. A cordless modem relay according to claim 1, wherein a diode is provided in a circuit for directly supplying power to the modem from the battery, and a diode is provided in a circuit for supplying power to the modem from the power supply voltage boosting circuit. apparatus.