JPS6318895A - Power backup system for electronic exchange - Google Patents

Abstract

PURPOSE:To reduce the consumption current of a battery hereafter, and to prolong the time until power supply to a control part is cut off and to raise the maintenance capacity of data by cutting off power supply to a line connection part when the output voltage from the battery drops below a second voltage which is higher than a lowest operation voltage at the time of service interruption. CONSTITUTION:A power source part 30 is provided with a first and a second over discharge prevention circuits (DET1) 34 and (DET2) 35 which monitor the output voltage from the battery 32 at the time of service interruption. The first over discharge prevention circuit 34 consists of a voltage detection part and a relay, and it monitors the output voltage from the battery 32at the time of service interruption. Said circuit 34 opens a relay contact point 34a when the voltage drops below the lowest operation voltage V1, whereby the supply of the source voltage from the battery 32 to the control part 2 is cut off. Similarly to the over discharge prevention circuit 34, the second over discharge prevention circuit 35 consists of the voltage detection part and the relay, and opens a relay contact point 35a when the output voltage from the battery 32 drops below the second voltage V2 which is set higher than the lowest operation voltage V1, whereby the supply of the battery voltage to the line connection part 1 is cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION C. OBJECTS OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in a power backup system for a stored program type electronic switch.

(Prior Art) In recent years, electronic exchanges that control using storage programs have become mainstream, but this type of switching equipment generally has a power supply section that handles storage programs and I/O from power outages due to lightning outages.
Equipped with a backup power source to protect your data. FIG. 3 shows an example of the configuration of this type of exchange, in which 1 indicates a line connection section, 2 a control section, and 3 a power supply section. The line connection unit 1 includes a network switch (NW) 11, and a plurality of line circuits (NW) each connected to an extension telephone R4 by the network switch 11.
LC) 12 and office line 5 are connected to the office line trunk (TRK)
) 13. The control unit 2 also includes a central control unit (CPU) 21, a floppy disk 22 for storing stored programs, etc., and a memory 2 such as a RAM for temporarily storing data, etc.
3, and CPL according to the above M product program.
I21 controls the line connection section 1. Furthermore, power supply section 3
is a predetermined DC voltage (e.g. -4
A voltage generation circuit (CHG) 31 that generates 8V) and supplies it to the line connection section 1 and the control section 2, respectively, and a battery (BAT) that is charged by this voltage generation circuit 31.
32, an overdischarge prevention circuit (DET) 34 that monitors the output voltage of the battery 32 at the time of IT, and a power failure monitoring circuit (ACDET>33 that monitors AC power failure. This is a relay contact for power supply control operated by the relay of the tIi electricity detection circuit 34.

With this configuration, when AC and NFill pressures are being supplied, the DC voltage (-48V) generated by the voltage generation circuit 31 is supplied to the line connection section 1 and the control section 1 and 2, respectively. Line connection part 1
And the control unit 2 is in an operating state. Also, at this time, the battery 32 is charged with the voltage generated by the voltage generation circuit 31.

Now, in this state, if the supply of AC voltage is cut off for some reason as shown in FIG. Voltage is supplied to the line connection section 1 and the control section 2, respectively, so that the line connection section 1 and the control section 2 continue to operate. In other words, N11! A backup is made. Further, the occurrence of the power outage is detected by the power outage monitoring circuit 33 and notified to the CPLI 21 of the control unit 2. Then CPU21
While continuing line connection control o, the control data stored in the memory 23, such as speed dial information input from the extension telephone 114, is read out from the memory 23 for protection and stored on the floppy disk. Add 1 to @22. Therefore, if the restoration of the AC power supply takes a long time and the output voltage of the battery 32 drops below the lower limit value v1 of the operable voltage, as shown in FIG. As shown in Figure 4(C), i
Even if the supply of power supply voltage to the li control unit 2 is cut off,
The stored contents of the memory 23 will not be erased (they will be retained as they are transferred to the floppy disk).

However, with such a conventional M source backup method, there is no problem as long as the retention time of the battery 32 (T in FIG. 4) is long enough, but 1.
l! 1, the power supply from the battery 32 to the control unit 2 may be cut off before all the contents of the memory 23 are written to the floppy disk device 22, and the contents of the memory 23 may be interrupted. could not be protected reliably. Further, in order to solve this problem, the number of customers for the battery 32 may be increased, but doing so would lead to an increase in the size of the battery, which is not preferable.

(Problems to be Solved by the Invention) As described above, the conventional power backup system has a problem in that it is not possible to save all the stored contents of the memory 23 when the traffic is large and the power consumption of the line connection section is large. The present invention focuses on this point and makes it possible to reliably save all the contents of the memory even when the traffic is large without increasing the battery capacity, thereby increasing the data retention performance. The present invention also aims to provide a II source backup system for electronic exchanges that does not require an increase in the size of the battery.

[Configuration of the Invention (Means for Solving Problems)] The present invention provides first and second power supply control circuits each having a different threshold value for output voltage determination in the power supply section, and If this occurs, the second power supply control circuit first monitors the output voltage of the battery, and when the value drops below a predetermined second value, 11111 is output from the battery.
While maintaining the supply of 1.7if pressure to the section, connect the line to R8l.
After controlling by the second power supply uO circuit, the output voltage of the battery is monitored by the first N source supply control circuit, and its value is determined by the second When the voltage drops below a predetermined first value, which is smaller than the line voltage, the power supply voltage is completely supplied from the battery to the line control section and the control group.

(Function) As a result, in the event of a power outage, when the battery output voltage drops to the second voltage higher than the minimum operating voltage, only the power supply to the line connection is cut off, so the subsequent battery consumption current The battery life is extended by reducing the battery life, thereby significantly extending the time until the power supply from the battery to the Illti 11 is cut off. Therefore, even if the traffic is large and the power consumption of the line connection section is large, the operating time of the control section can be maintained for a long time, and during this time, all the stored contents of the memory can be reliably saved to non-volatile memory. Can be done. Further, since the capacity of the battery does not need to be increased and can be reduced, it is possible to prevent the battery from becoming larger.

(Embodiment) FIG. 1 shows the configuration of an electronic exchange to which a power backup system is applied in an embodiment of the present invention. In this figure, the same parts as those in FIG. 3 are given the same reference numerals and detailed explanations will be omitted.

'The Fi source section 30 includes first and second over-discharge prevention circuits (DETI) that monitor the output voltage of the battery 32 during a power outage.
)34. (DET2) 35 is provided. First, the first overdischarge prevention circuit 34 consists of a voltage detection section and a relay.
During a power outage, the output voltage of the battery 32 is monitored, and when this voltage drops below the minimum operating voltage ■1, the relay contact 34 is activated.
a is opened, thereby cutting off the NR lightning voltage supply from the battery 32 to the control unit 2. On the other hand, the second over-discharge prevention circuit 35 is the same as the first over-discharge prevention circuit 34 in that it is composed of a voltage detection section and a relay, but the output voltage of the battery 32 is the minimum operating voltage V1. The relay contact 35a is opened to cut off the supply of battery voltage to the line connection section 1 when the voltage drops below a second voltage v2 which is set higher than the second voltage v2.

With this configuration, when the AC1lililf pressure is normally supplied, the relay contact 34a.

35a are in the closed state, the stable DC power supply voltage generated by the voltage generation circuit 31 is supplied to the line connection section 1 and the 1111 section 2, and thereby the line connection section 1 and the control section 2 are in operation. It is in a state.

Now, if a power outage occurs in this state as shown in FIG. 2, respectively. Therefore, the line connection section 1 and the control section 2 continue to operate as they are, and as a result, the problem of being unable to immediately connect the line due to a power outage is avoided. On the other hand, the power outage of the AC power supply voltage is detected by the power outage detection circuit 33 and notified to CP[J21 of the control unit 2. Then, the CPU 21 learns from this notification that a power outage has occurred in the main power supply, and in order to protect various data such as speed dial number information stored in the memory 23, it deletes these from the memory 23 while controlling the line connection. The operation of reading and writing data to the nonvolatile floppy disk device 21 is started. At this point, the output voltage of the battery 32 is monitored by the first and second overdischarge prevention circuits 34 and 35, and the output voltage is now at the second voltage . 2, at this point the relay contact 35a is opened by the second overdischarge prevention circuit 35, and as a result, the voltage of 8M is supplied from the battery 32 to the line connection part 1 as shown in FIG. 2(C). Cut off.

Therefore times f! The connection unit 1 stops subsequent line connection operations. However, at this time, the relay contact 34a still maintains the open state, and the output voltage of the battery 32 is supplied to the control section 2. Therefore, the control unit 2 continues to save the contents of the memory 23 to the floppy disk device 22. Then, when the output voltage of the battery 32 drops to the minimum operating voltage ■1, the relay contact 34a is opened by the first overdischarge prevention circuit 34, and as a result, the power supply to the control unit 2 is cut off, and the control unit 2 All $1 at that point! 10 Stop operation.

By the way, in the above operation, the second overdischarge prevention circuit 3
5, when the power supply to the line connection unit 1 is cut off, the current consumption of the battery 32 is significantly reduced from then on. For this reason,
The time T' from the occurrence of a power outage until the first overdischarge prevention circuit 34 cuts off the supply of N source to the control unit 2 is extremely long as shown in FIG. memory 2
The saving of the memory contents in step 3 can be completed.

In this embodiment, when a power outage occurs,
When the output voltage of the battery 32 drops to the second voltage v2, the power supply to the line connection unit 1 with large power consumption is stopped, and then when the output voltage of the battery 32 drops to the minimum operating voltage v1, the control unit 2 (of battery 32) by stopping power supply to all circuits including
The battery life can be extended by reducing the power consumption current, and thereby the entire contents of the memory 23 can be saved to the floppy disk device 22.

Therefore, data can be reliably retained and AC
When the power supply voltage is restored and the device is started, operation can be started without resetting the data.

Note that the present invention is not limited to the above embodiments. For example, if traffic is monitored during a power outage and there is a large strike, power to the line connection may be cut off relatively quickly, while if traffic is light, power may be continued for a long time to the line connection. good. Furthermore, in the above embodiment, the power supply is controlled by monitoring the output voltage of the battery, but the time is also monitored and the power supply to the line connection section and the control section is cut off when a predetermined period of time has elapsed. Good too. In addition, the configurations of the first and second power supply control circuits, the configuration of the electronic exchange, the type of nonvolatile memory for saving data, etc. may be modified in various ways without departing from the gist of the present invention. According to the present invention, the TIl source section is provided with first and second power supply control circuits each having a different threshold value for output voltage determination, so that when a power outage occurs, the second NvA The supply control circuit monitors the output voltage of the battery, and when the value drops below a predetermined second value, the supply of electric current from the battery to the control unit is maintained, and only the supply to the line connection unit is started. After the second power supply control circuit has turned off the battery, the first power supply control circuit monitors the output voltage of the battery and sets the value to a predetermined value smaller than the second value. By completely cutting off the supply of Tj source voltage from the battery to the line control unit and control 2 (1) when the voltage drops below the first value, traffic can be reduced without increasing battery capacity. Even if the memory is large, all the stored contents of the memory can be reliably evacuated, thereby providing a power backup system for the electronic exchange I that has high data retention performance and does not require an increase in the size of the battery.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram showing the configuration of an electronic exchange to which a power backup system is applied in an embodiment of the present invention;
Figure 2 is a timing diagram used to explain the 171 operation of the exchange, Figure 3 is a circuit block diagram showing the configuration of an electronic exchange using a conventional power backup system, and Figure 4 is used to explain the operation of the exchange. FIG. 1... Line connection part, 11... Network switch <NW), 12... Line circuit (LC), 13...
- Office line trunk (TRK), 2...control unit, 21...
・Central control unit (CPU), 22... Floppy disk device (FDD), 23... Volatile memory (ME
M), 3...power supply section, 31...voltage generation circuit (
CHG), 32... Battery (BAT), 33...
Power failure detection circuit (ACDET), 34... first over-discharge prevention circuit (DETl), 35... second over-discharge prevention circuit (DET2), 34a, 35a... relay contact,
4...Inside I! Telephone station, 5... central office line.

Claims (1)

[Claims] Consisting of a line connection section, a control section that controls the line connection section, and a power supply section that supplies power supply voltage to these,
In an electronic exchange having a battery in a power supply section that supplies power voltage to each of the above sections in place of the main power supply during a power outage, the power supply section monitors the output voltage of the battery and sets the value to a predetermined first value. a first power supply control circuit that cuts off the power supply from the battery to the control section and the line connection section when the power decreases to below; and a second power supply control circuit that cuts off only the power supply to the line connection section when the output voltage of the line falls below a predetermined second value that is greater than the first value. Features a power backup system for electronic exchanges.