JPH04157996A - Feeding system for key service unit - Google Patents

Abstract

PURPOSE:To supply an efficient voltage to a key telephone set by detecting the feed voltage of the key telephone set by a detecting circuit and controlling the feed voltage by a power supply circuit part on the main device side. CONSTITUTION:A control circuit 9 of a key telephone set 6 performs the initial start processing of the telephone set 6 by the power supplied to an interface part 7. At this time, a feed voltage detecting circuit part 8 compares the feed voltage with a preliminarily set voltage and transmits result information to a circuit part 9 of the telephone set 6. When the feed voltage is higher than the reference voltage, the circuit part 9 transmits a code signal to a control circuit part 3 and reduces the feed voltage to the reference voltage. When the feed voltage is lower, the circuit part 9 causes the circuit part 3 to raise the feed voltage to the reference voltage.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a power supply method for a button telephone device.

[Conventional technology]

The conventional power supply system for key telephone devices is such that a constant power supply voltage is supplied from the main device of the key telephone to the key telephone.

[Problem to be solved by the invention]

The above-mentioned conventional power supply system for button telephone devices is such that a constant power supply voltage is supplied from the key telephone main device to the button telephone, so if the line between the key telephone main device and the button telephone is long, the button telephone If the power supply voltage at the end of the button phone decreases, sufficient power supply current cannot be obtained, resulting in long-distance call problems.Also, if the line between the button telephones is short, the power supply voltage at the end of the button telephone becomes higher than necessary, making it difficult to provide efficient power supply. The disadvantage is that the power consumption increases because the power consumption is reduced.

[Means to solve the problem]

The power supply method of the button telephone device of the present invention is such that in the button telephone device equipped with a main device accommodating a plurality of office lines and a plurality of button telephones, the button telephone device detects the voltage supplied from the main device and uses it as a reference. It has a power supply voltage detecting means for comparing the detected voltage with a voltage and converting the detected voltage into a code signal, and a signal transmitting means for transmitting the code signal to the main device, and the main device supplies the voltage to the button telephone. It has a voltage supply means, and a control means that receives and judges the code signal and controls the voltage supply means so that the voltage supplied to the button telephone approaches the reference voltage.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
The block diagram of the power supply voltage detection circuit in the figure, Figure 3 is
FIG. 4 is a diagram showing the relationship between the input voltage and output data of the signal conversion circuit in the figure, and is a communication sequence diagram between the control circuit section on the main device side and the control circuit section on the button telephone side in FIG. 1.

In FIG. 1, in the button telephone device of this embodiment, during the initial start-up process, the button telephone interface section 2 in the key telephone main device 1 is connected via the power supply circuit section 4 under the control of the control circuit section 3. , a case where power is supplied to a button telephone 6 connected by a line cord 5 is shown.

The supplied power is supplied to the main device interface section 7 of the key telephone 6. Main device interface section 7
The control circuit section 9 of the button telephone 6 performs initial start-up processing of the button telephone 6 using the power supplied to the button telephone 6 . At this time, the power supply voltage detection circuit section 8 compares the power supply voltage with a preset voltage (reference voltage) and transmits the result information to the control circuit section 9 of the button telephone 6.

If the power supply voltage is higher than the reference voltage, the control circuit section 9 sends a code signal to the main device interface section 7° line cord 5. to request that the voltage be lowered to the reference voltage. The signal is transmitted to the control circuit unit 3 via the power supply circuit 4, and the control circuit unit 3 controls the power supply circuit unit 4 to perform a process of lowering the power supply voltage to the reference voltage.

On the other hand, if the power supply voltage is low, the control circuit section 9 causes the control circuit section 3 to increase the power supply voltage to the reference voltage.

Next, a power supply voltage detection method will be explained using FIGS. 2 and 3.

The power supply voltage to the button telephone 6 is compared with a preset reference voltage by a power supply voltage detection circuit section 8 via the main device interface section 7. The power supply voltage is a voltage a divided by a resistor 13 and a resistor 14, and is input to the + side of the comparator 11.

On the - side, voltage A is set as a reference voltage by a variable resistor 12, and voltages a and b are compared by a comparator 11. When the supply voltage is high, the comparator 11 outputs a positive voltage +Vt, +V
2, and if the voltage is low, negative voltages -Vl and V2 are output.

As shown in FIG. 3, the positive and negative data output from the comparator 11 are converted to
IJ, O~V2 Harl OJ, -V2~O
"rol" and -V1 to -V2 are respectively converted to rooJ and output to the control circuit section 9. However, the setting value is
It should be between 2 and +V2.

The communication sequence between the control circuit section 3 on the main device 1 side and the control circuit section 9 on the key telephone 6 side will be explained using FIG. 4.

The control circuit section 9 of the button telephone 6 receives a signal (A) for starting up the button telephone 6 from the control circuit section 3, but the power supply voltage deviates from the preset voltage (reference voltage). If the output of the comparator 11 is +V2
~+V11 or -■1~-V2, the following processing is performed.

The power supply voltage is higher than the set value, +V2 to +V, (“11”
), the signal (B) for lowering the power supply voltage from the control circuit section 9 is set to the set value (ro IJ
or rloJ) until the main device interface unit 7
The control circuit section 3 continues to be fed through the control circuit 3.

When the set value (rolJ or riot) is satisfied, the control circuit unit 9 transmits a signal (C) indicating that the power supply voltage has reached the set value to the control circuit unit 3, and after the control circuit unit 3 receives it, the control circuit A signal (D) for the unit 3 to start up the button telephone 6
) is transmitted to the control circuit section 9.

After the control circuit section 9 receives the signal, the button telephone 6
A signal (E) indicating that the button has risen is sent to the control circuit section 3, and the initial startup of the button telephone 6 is completed.

In addition, if the detected power supply voltage is low voltage -■, ~-V2 ("
00''), it goes without saying that the process of increasing the power supply voltage is performed in the above-described sequence.

〔Effect of the invention〕

As explained above, the present invention detects the power supply voltage of the key telephone by the detection circuit on the button telephone, and based on the detection result, the power supply circuit of the main device sets the power supply voltage of the key telephone to a preset value. Even if the line length between the button telephone main unit and the button telephone is long, it prevents the power supply voltage from decreasing at the end of the button telephone, and also reduces line loss when the line between the button telephones is short. Although the voltage is small, it has the effect of suppressing the voltage of "necessities" from being supplied to the button telephone, and supplying more efficient voltage to the button telephone than in the past.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
The block diagram of the power supply voltage detection circuit in the figure, Figure 3 is
FIG. 4 is a diagram showing the relationship between the input voltage and output data of the signal conversion circuit in the figure, and is a communication sequence diagram between the control circuit section on the main device side and the control circuit section on the button telephone side in FIG. 1. DESCRIPTION OF SYMBOLS 1... Button telephone main device, 2... Button telephone interface part, 3... Control circuit part, 4... Power supply circuit part, 5... Line cord, 6... Button telephone machine, 7 ...Main device interface section, 8.. Supply voltage detection circuit section, 9.. Control circuit section, 10.. Signal conversion circuit, 11.. Comparator, 12.. Variable resistor, 13.
．． 14...Resistance. A... Signal for turning off the button telephone, B...
・Signal for lowering the power supply voltage, C...Signal indicating that the power supply voltage has reached the set value, D...Signal for starting up the button telephone, E...Signal for starting up the button telephone. A signal indicating that something has gone wrong.

Claims (1)

[Claims] In a button telephone device including a main device accommodating a plurality of office lines and a plurality of button telephones, the button telephone detects the voltage supplied from the main device, compares it with a reference voltage, and converts the detected voltage into a code signal. The main device includes voltage supply means for supplying the voltage of the button telephone and receiving the code signal. and control means for controlling the voltage supply means so that the voltage to be supplied to the button telephone set approaches the reference voltage.