JPS6075194A - Power supply control system - Google Patents

Abstract

PURPOSE:To decrease power feeding from a spare power supply by blocking calling at commercial power failure in a private branch of exchange driven by the commercial power supply and the spare power supply. CONSTITUTION:The power supply POW supplies a prescribed power by using a commercial power source AC and rectifier circuits PW1, PW2 and charges up batteries B1, B2 as the spare power supply by means by floating. When the power source AC is failed, power failure is informed to a processor by a power failure detecting circuit PD, the processor supervises the idle/busy state of extensions EXT1-n, brings a signal line PEi corresponding to an extension of idle state to a high potential, blocks power feeding and blocks calling. Moreover, the power supply fed to the processor is interrupted except for a storage circuit RAM. When the power failure is restored and the power of the commercial power source AC is restored, the power failure detecting circuit PD stops the information of power falure to the processor and the rectifier circuits PW1, PW2 supply again the prescribed power.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a power supply control method, particularly to a power supply control method in a private branch exchange that is driven by a commercial power source and a standby power source when the commercial power source is out of power.

(bl) Prior Art and Problems Figure 1 is a diagram showing an example of a private branch exchange to which the present invention is applied. In Figure 1, the private branch exchange has n extensions EXT connected to an extension interface circuit IFE, and m The office lines CL of the lines are housed in the office line interface circuits IFC.The processor PR exchanges and connects the extension lines EXT and the office lines CL via the communication path network SW. Driven by supplied power. The power supply unit POW normally supplies power from the commercial AC power supply to the private branch exchange, but immediately interrupting ongoing calls in the event of a power outage of the commercial AC power supply will significantly degrade service. Therefore, it is known to provide a backup power source such as a battery and continuously supply power to the private branch exchange from the backup power source.

However, in order to maintain all the functions of the private branch exchange during a complete power outage period of the commercial power supply AC, the backup power supply needs to be large-scale, and the power supply device I〇W becomes relatively expensive.

Especially in small-scale private branch exchanges, the power supply 1) OW
The economic efficiency of σ1r is not as high as the economic efficiency of setting σ1r, and the impact is large.

(c+ Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of the conventional power supply control method as described above, and to improve the economic efficiency of the power supply device without significantly reducing the service even in the event of a power outage of the commercial power supply. It is about letting things happen.

+d) Structure of the Invention The object of the present invention is to provide, in a private branch exchange driven by a commercial power source and a standby power source in the event of a power outage of the commercial power source, a call is made as soon as the accommodating extension line becomes vacant during a power outage of the commercial power source. This is achieved by providing means for blocking the power supply from the standby power supply from the time when all extension lines are placed in a call blocking state until the power supply from the commercial power supply is resumed.

tel　Embodiments of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a power supply control method according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In Figure 2, the power supply unit POW is the commercial power supply A.
The rectifier circuits PWI and PW2 during the power supply of C generate 48 volts and 5 volts DC, respectively. Note that the processor PR sets the power supply signal lines PEI to PEn to the ground potential, and in order to maintain the transistors Q51 to Q5n in the blocking state, the transistors Q41 to Q4n become conductive, and the connection from the active circuit PWI to the extension line interface circuit IFB occurs.
A direct current of 48 volts is supplied to each extension E XT 1 to E XT n through. Further, 5 volts of DC is supplied from the rectifier circuit PW2 to the base of the transistor Q1 via the resistor R1. As a result, transistor Q1 becomes conductive, relay A operates, and 5 volts of direct current is supplied to processor PR via contact a. Furthermore, processor P
R sets the power supply signal line PC to ground potential and maintains the transistor Q3 in the blocking state, so that the transistor Q2 becomes conductive, and a holding circuit for the relay A is formed. Also, the outputs of each rectifier circuit PWI and P W 2 have ?
1llt! ! J31 and B2 are provided as backup power sources, and are floatingly charged by the respective rectifier circuits pwt and PW2 during power supply. When the commercial power supply AC has a power outage, the power outage detection circuit PD detects the power outage and notifies the processor PR of the power outage via the signal line PF. Incidentally, the extension interface circuit IFE and the processor PR continue to be supplied with DC 48 volts and 5 volts from the batteries B1 and B2, respectively, and the relay A continues to be maintained via the transistor Q2. Processor PR who received the notification calls extension E.
Monitors the idle status of XTI to EXTn, and monitors the signal line P corresponding to the idle extension EXTi (i is 1 to n)
Set Ei to a high potential. Further, the extension line EXTi which is currently on a call also sets the corresponding signal line PEi to a high potential as soon as the call ends. As a result) - transistor Q5i is conductive, Q
4i, the state is blocked, and the direct current 4 to extension EXT i
Since power supply to 8 is blocked, extension EXTi is no longer able to make calls. When signal lines PE1 to PEn corresponding to all extension lines EXT1 to EXTn are set to high potential, processor P
R sets the signal line PC to a high potential to turn on the transistor Q3. As a result, the transistor Q2 is in a stopped state, the relay A is drained, and the DC 5 volts supplied from the battery B2 to the processor PR is cut off, except for the memory circuit RAM that holds various connection information. As a result of the above, almost all power supply from batteries B1 and B2 is stopped.

When the power outage eventually recovers and the power supply from the commercial power supply AC is resumed, the power outage detection circuit PD stops notifying the processor PR of the power outage, and the rectifier circuits PWI and PW2 again generate DC 48 volts and 5 volts, respectively. Transistor Q1 supplied with 48 volts of DC from rectifier circuit PW2 becomes conductive and operates relay A.

As a result, the processor PR is again supplied with 5 volts DC and initialized, and the signal lines PEI to PEn and the PC
Set to earth potential. As a result, transistors Q51 to Q5n are blocked, transistors Q41 to Q4n
becomes conductive, and the rectifier circuit PW2 generates a direct current 48
Holt connects extension E via extension interface circuit■FE
XT1 to EXTn. Further, transistor Q3 is in a blocked state, transistors 1 to Q2 are in a conductive state, and a holding circuit for relay A is formed. Further, batteries B1 and B2 are floatingly charged by rectifier circuits PWI and PW2, respectively.

As is clear from the above explanation, according to this embodiment, when a commercial tAAC has a power outage, an idle extension EX
The power supply to Ti is immediately stopped, and the power supply to the extensions EXTi which are in use is stopped one after another as soon as the call ends, and subsequent calls are prevented. When all extensions EXTl to EXTn enter the call blocking state, the power supply to the processor PR is also stopped except for the memory circuit RAM, so batteries B1 and B
All power supply from 2 is stopped. Therefore, in the event of a power outage, calls in progress are prevented from being interrupted immediately, and battery B
The power supply from 1 and B2 is kept to the minimum necessary.

It should be noted that FIG.
The present invention is not limited to volts, and the effects of the present invention do not change even when any other power source is supplied. Further, the configuration of the power supply device pow is not limited to that shown in the drawings, and many other modifications may be considered, but the effects of the present invention will not change in any case. Furthermore, it goes without saying that the configuration of the private branch exchange to which the present invention is applied is not limited to that shown in the drawings.

(f) Effects of the Invention According to the present invention, in the private branch exchange, the power supply of the backup power source can be maintained to the minimum necessary level without significantly degrading the service in the event of a power outage, and the power supply device and, by extension, can be improved. The economy of private branch exchanges can be promoted.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a private branch exchange to which the present invention is applied, and FIG. 2 is a diagram showing a power supply control system according to an embodiment of the present invention. In the figure, EXT is the extension line, CL is the office line, IFE is the extension interface circuit, IFC is the office line interface circuit, and SW is the telephone call U! I network, PR is a processor, pow is a power supply, PWI and PW2 are rectifier circuits, PD is a power failure detection circuit, Bl and B2 are ft ponds, A is a relay, Ql to Q5n are transistors, R1 and R2 are resistors, PE
I to P E n, PC and PF are signal lines, and AC is a commercial power source. Continuing from page 1 [Phase] Inventor Naoki Matsuo Yokosuka City Buichigo Communication Research Institute

Claims (1)

[Claims] In a private branch exchange driven by a commercial power source and a standby power source in the event of a power outage of the commercial power source, means for preventing calls from being made as soon as the extension line to accommodate becomes vacant during a power outage of the commercial power source; A power supply control system comprising means for blocking power supply from the standby power supply from the time when the extension line is placed in a call blocking state until the power supply from the commercial power supply is resumed.