JPH05236168A - Multifunction phone - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a multi-function telephone with low power consumption by using a solar cell together. [Structure] A solar cell 19 and a solar cell 1 in which electric equipment such as an internal telephone circuit 6 and a display circuit 14 are operated by receiving a local voltage Vc and a local voltage Vb.
9 is the output voltage Va or the output voltage Va of the solar cell 19 is the added voltage V obtained by adding the local voltage Vc and the local voltage Vb.
Power source changeover switch 20 for selectively outputting either one of e
And a voltage comparator 21 that compares the output voltage Va with a reference voltage Vd, which is the lowest operating voltage of the electrical equipment, and based on the comparison result of the voltage comparator 21, outputs when the output voltage Va is higher than the reference voltage Vd. While selecting the voltage Va,
When the output voltage Va is lower than the reference voltage Vd, the control unit 5 that sends a switching signal for selecting the added voltage Ve to the power source changeover switch 20 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-function telephone having a function of displaying various operations by providing a display unit on a telephone body.

[0002]

2. Description of the Related Art ISDN (Integrated Services Digital Network), which has become widespread in recent years, and PBX, which is well known in the past,
A wide variety of multifunctional telephones are connected and used for digital lines in button telephone devices and the like, depending on the application.

As an example of this type of digital multifunction telephone, the one shown in FIG. 2 is known. In the figure,
Reference numeral 1 denotes a telephone station, which is connected to a line interface 3 of a multifunction telephone via a telephone line 2. A DC-DC converter 18 is connected to the line interface 3, and a control unit 5, a telephone circuit 6, a display circuit 14 and the like are connected via a data bus 4.

The control unit 5 is a microcomputer for controlling the operation of the entire apparatus, and includes a CPU (central processing unit) 5a, a ROM 5b for storing an operation program, and a RAM 5c for temporarily storing a dial number.
Voice data and control messages are exchanged during incoming / outgoing calls and during call operation.

A dial pad 7 for counting dials at the time of dialing is connected to the control section 5 via a data bus 4. The dial pad 7 detects on-hook and off-hook of the handset 9. The output of the hook switch 8 is guided.

Further, the modulation / demodulation circuit 10 is bidirectionally connected to the control section 5 via the data bus 4, and the display circuit 14 is also connected thereto. The modulation / demodulation circuit 10 is bidirectionally connected to the audio interface bell circuit 11, and the audio interface bell circuit 1
A handset 9, a speaker 12, and a microphone 13 are respectively connected to 1.

The DC-DC converter 18 sends to the adder 17 the DC voltage V1 supplied from the telephone station and supplied by the station as the operating voltage Vc of the multifunction telephone. This adder 1
An output voltage Vb of the AC adapter 16 for converting the voltage from the AC commercial power supply 15 of 100 V into a DC low voltage is led to 7. Then, the output voltage Vb and DC-D
The output voltage Vc from the C converter 18 is supplied as a power supply voltage Vcc to the telephone circuit 6 and the display circuit 14 of the multifunction telephone.

The display circuit 14 includes an LED 14a and an LCD 1
4b and the like, and is arranged in a telephone body (not shown) to receive supply of the power supply voltage Vcc. The LED 14a receives a drive signal from the control unit 5 when an incoming call to an outside line is received or when the call is put on hold, and is turned on to display a usage state of the line. Further, the LCD 14b is adapted to display the dialed number of the other party upon receiving the dialed number data when dialing.

In the multi-function telephone having the above-mentioned structure, when the control section 5 exchanges voice data and control messages, the transmitter / receiver 9 or the speaker 12 via the audio interface / bell circuit 11 is used for modulation / demodulation circuit 10 when transmitting. The voice signal transferred from the side is transmitted to the telephone line 2 from the line interface 3 as PCM data.

On the other hand, when an incoming call arrives, the dial tone or ring back tone from the outside line is transferred to the modulation / demodulation circuit 10 side. At this time, the modulation / demodulation circuit 10 sends a dial tone or a ring back tone to the audio interface.
Since the signal is sent to the bell circuit 11, the ringing tone is emitted from the handset 9 or the microphone 13.

During such an operation, LE
D14a is driven to display the incoming call of the outside line, while LCD
When 14b is driven, the dial number of the other party is displayed.

[0012]

By the way, since the above-mentioned conventional multi-function telephone is a digital type, it is necessary to supply electric power to the telephone circuit 6 even during standby. In addition, during the outgoing / incoming call operation or the call operation, it is necessary to maintain the display function of the LED 14a, the LCD 14b, etc., so that the power from the station power supply and the commercial power supply is constantly consumed.

Therefore, the station power supply equipment such as the PBX and the key telephone equipment and the external power supply device to which the multi-function telephone of this kind is connected require a large capacity in proportion to the number of installed units, and the entire device becomes large. .. Such an increase in size poses a problem in securing an installation space in an office or the like which tends to be downsized.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a multi-function telephone which realizes low power consumption by using a solar cell together.

[0015]

In order to solve the above-mentioned problems, a multifunction telephone according to the present invention receives an office voltage from a central office and a local voltage from an external power source to receive electricity from an internal telephone circuit or a display circuit. A telephone for activating an equipment part, which is provided in the telephone body and generates electric power by photoelectric conversion upon receiving irradiation light, and an output voltage of the photoelectric converter or an output voltage of the photoelectric converter. Voltage and a power supply switching unit that selectively outputs one of the added voltage obtained by adding the local voltage, and a voltage comparison that compares the output voltage of the photoelectric converter with a reference voltage based on the operating voltage of the electrical equipment unit. When the output voltage of the photoelectric converter is higher than the reference voltage, the output voltage of the photoelectric converter is selected based on the comparison result of the voltage comparator and the output voltage of the photoelectric converter. When less than pressure a configuration in which a control unit for transmitting a switching signal for selecting the added voltage to the power switching unit.

[0016]

When the output voltage of the photoelectric converter is higher than the reference voltage corresponding to the operating voltage of the electric equipment section, the output voltage of the photoelectric converter is selected and sent to the telephone circuit, the display circuit and the like.
Therefore, when the power consumption is low as in the standby mode of the telephone, the electric equipment section can be operated only by the output of the photoelectric converter.

Then, the surrounding environment of the telephone body changes, such as when the surroundings become dark, and the amount of light incident on the photoelectric converter decreases.
As a result, when the output of the photoelectric converter falls below the reference voltage, the voltage comparator outputs a signal indicating the voltage drop to the control unit. The control unit sends a switching signal to the power supply switching unit based on the signal indicating the voltage drop, and at this time, selects the added voltage as the output voltage. Further, when the load on the electrical equipment unit increases, such as when a call is made, the control unit sends a switching signal to the power supply switching unit, and at this time also selects the added voltage as the output voltage. As a result, the operating voltage of the electrical equipment section is ensured, the telephone can be maintained in the standby mode without any trouble, and the operation of each section and its display can be performed at the time of making or receiving a call.

As described above, in normal use,
Since only the output of the photoelectric converter can be used, the power consumption of the telephone office and the external power source is significantly reduced.

[0019]

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 a multifunction telephone.

The multi-function telephone of the present invention is provided with a solar cell 19 in the power source section and its basic structure is substantially the same as that of the conventional example shown in FIG. 2. Therefore, the same parts are designated by the same reference numerals. Detailed description is omitted.

In FIG. 1, reference numeral 19 is a solar cell comprising a conventionally known photoelectric converter, which is attached to the main body of the telephone. The solar cell 19 generates a voltage Va by photoelectric conversion when receiving sunlight or illumination light from an indoor lighting fixture, and its output is one input terminal a of the power source changeover switch 20 and a voltage comparator 21. Is connected to one of the input terminals.

The adder 17 includes an AC adapter 16
Output voltage Vb and the output voltage Vc of the DC-DC converter 18
And its output is the lowest operating voltage Vd and the other input terminal b of the power source changeover switch 20 and the voltage comparator 21.
To the other input terminal of. And
The output of the voltage comparator 21 is guided to the control unit 5 as a signal indicating the comparison result, and from the control unit 5, based on the signal indicating the comparison result and the operation signal at the time of outgoing / incoming call, the power source changeover switch 20. A switching signal is output to.

The power source changeover switch 20 has an input terminal a and an output terminal c directly connected to each other, and an input terminal b.
And the output terminal c are connected via the open / close switch 201, and the open / close operation of the open / close switch 201 is performed by the switching signal. That is, the open / close operation of the open / close switch 201 causes the solar cell 19 to reach the output voltage Va from the solar cell 19 or the minimum operating voltage Vd.
One of the added voltage Ve to which the output voltage Va from the above is added is selected and output as the power supply Vcc to the electric equipment parts such as the telephone circuit 6 and the display circuit 14.

The voltage comparator 21 uses the minimum operating voltage Vd for operating the telephone circuit 6 and the display circuit 14 as a reference, and when the output voltage Va from the solar cell 19 is lower than this reference voltage Vd, for example, H level. Signal of control unit 5
When the output voltage Va from the solar cell 19 exceeds the reference voltage Vd, for example, an L level signal is output to the control unit 5.
It is designed to output to.

The control unit 5 outputs a switching signal to the open / close switch 201 based on the operation signal at the time of receiving the H level signal from the voltage comparator 21 and at the time of making / receiving a call, and closes the open / close switch 201. , Voltage comparator 21
When receiving the L level signal from
A switching signal is output to the open / close switch 201 to open the open / close switch 201.

Next, the operation of the multi-function telephone having the above configuration will be described.

In the standby mode of the telephone, when the indoor lighting fixture is turned on and the solar cell 19 is illuminated,
The voltage Va generated by the solar cell 19 by photoelectric conversion is supplied to each part of the telephone through the power source changeover switch 20. The voltage Va is also given to the voltage comparator 21 and compared with the reference voltage Vd which is the lowest operating voltage. At this time, since the voltage Va exceeds the reference voltage Vd, the voltage comparator 21 outputs an L level signal to the control unit 5. Upon receiving the L level signal, the control unit 5 outputs a switching signal to the open / close switch 201 of the power source changeover switch 20, and the open / close switch 201
Keep open. That is, the power supply voltage Vcc to the telephone circuit 6 and the display circuit 14 is only the voltage Va from the solar cell 19.

In this state, if the surrounding environment changes, for example, if the lighting equipment is turned off or the telephone body is in the shadow of something,
The amount of light incident on the solar cell 19 is reduced. Therefore, the voltage Va from the solar cell 19 input to the voltage comparator 21 also decreases, and the voltage Va becomes lower than the reference voltage Vd, and the voltage comparator 21 outputs an H level signal to the control unit 5. To be done. The control unit 5 receives the H-level signal, so that the open / close switch 2 of the power source changeover switch 20.
A switching signal is output to 01 to close the open / close switch 201. As a result, the power supply voltage Vcc to the telephone circuit 6 and the display circuit 14 becomes the solar cell 19 at the minimum operating voltage Vd.
The output voltage Va is the sum of the added voltage Ve.

This ensures the lowest operating voltage,
The phone will remain in standby mode without any problems.

On the other hand, when the output voltage Va of the solar cell 19 rises again and the voltage Va exceeds the reference voltage Vd, the control section 5 causes the power source changeover switch to operate based on the L level signal sent from the voltage comparator 21. A switching signal is sent to the open / close switch 201 of 20 to open the open / close switch 201 again. As a result, the local voltage Vb and the local voltage V
The standby mode can be maintained only by the output voltage Va of the solar cell 19 without consuming c and the like.

By the way, if there is an incoming call from an outside line or the user performs an outgoing operation during the standby operation, the CPU 5
A receives a signal transmitted via the data bus 4 and controls exchange of voice data and control messages. At this time, the display circuit 14 such as the LED 14a or the LCD 14b
Is driven, the load increases. Therefore, the control unit 5
Outputs a switching signal to the open / close switch 201 of the power source changeover switch 20 to close the open / close switch 201.
As a result, the power supply voltage Vcc to the telephone circuit 6 and the display circuit 14 becomes the added voltage Ve obtained by adding the output voltage Va from the solar cell 19 to the lowest operating voltage Vd. Therefore, the operating voltage is ensured, and the audio interface / bell circuit 11, the handset 9 and the speaker 1 that constitute the telephone circuit 6 are provided.
2 and the microphone 13 operate without any trouble.

Further, even during standby, if the current consumption during standby increases due to an increase in the number of LEDs 14b, etc., the voltage Va from the solar cell 19 drops, and the open / close switch 201 also opens at this time. In the closed state, the power supply voltage Vcc becomes the added voltage Ve obtained by adding the output voltage Va from the solar cell 19 to the minimum operating voltage Vd.

Incidentally, the output voltage Va from the solar cell 19
Even if the voltage drops, in the abnormal state where the local voltage Vc and the local voltage Vb are stopped, the voltage comparator 21 outputs V
Since it is determined that a> Vd, the open / close switch 201 remains open. However, in this case, the operation of each circuit is not guaranteed.

As described above, since the multi-function telephone equipped with the solar cell 19 uses the output voltage Va from the solar cell 19 not only during the normal standby but also during the operation at the time of incoming / outgoing calls, the local power feeding and the local power feeding are performed. It is possible to minimize power consumption and the like.

[0036]

In the normal use state, the multifunction telephone of the present invention uses only the output of the photoelectric converter provided in the telephone body, for example, a solar cell, and the amount of light incident on this photoelectric converter is reduced. It is configured to receive the power supplied from the central office and the external power supply to secure the operating voltage only when the output decreases and the load on the electrical equipment increases, such as when making and receiving calls. As a result, the power can be significantly reduced, and the power supply equipment of the telephone station, the external power supply device, and the like can be downsized and downsized.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing an electrical configuration of a conventional multifunction telephone.

[Explanation of symbols]

 1 Telephone Station 5 Control Unit 6 Telephone Circuit 14 Display Circuit 19 Solar Cell (Photoelectric Converter) 20 Power Supply Change Switch 21 Voltage Comparator 201 Open / Close Switch

Claims (1)

[Claims] 1. A multi-function telephone that receives an office voltage from a telephone office and a local voltage from an external power source to activate an electric equipment section such as an internal telephone circuit and a display circuit, and is provided in a telephone body to receive irradiation light. And a photoelectric converter that generates electric power by photoelectric conversion, and a power source that selectively outputs either the output voltage of this photoelectric converter or the added voltage obtained by adding the local voltage and the local voltage to the output voltage of this photoelectric converter. A switching unit, a voltage comparator that compares the output voltage of the photoelectric converter with a reference voltage based on the operating voltage of the electrical equipment unit, and the output voltage of the photoelectric converter based on the comparison result of the voltage comparator. Is higher than the reference voltage, the output voltage of the photoelectric converter is selected, and when the output voltage of the photoelectric converter is lower than the reference voltage, a switching signal for selecting the addition voltage is output. Multifunction telephone, characterized in that a control unit for sending the serial power source switching unit.