JPS59139828A - Monitoring system for preliminary power source of terminal device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This relates to a method for monitoring backup power sources.

Conventionally, communication terminal devices such as public telephones and Zetan telephone equipment that use general commercial power in addition to the power sent from stations via communication lines have become unusable in the event of a commercial power outage. Since there is a possibility that the service quality may be significantly degraded, countermeasures have been taken to maintain the same level of service even in the event of a commercial power outage by installing a backup power source. Secondary batteries such as nickel-cadmium storage batteries and sealed lead-acid batteries, which are small and can be used repeatedly, have often been used as backup power sources for such terminal devices. However, since the temperature conditions at the installation location of these terminal devices range widely from low to high temperatures, it is difficult to estimate the lifespan of the secondary batteries, and the frequency of commercial power outages is extremely low, about a few times a year. For most of the battery usage period, the secondary battery is in a charging state to replenish its self-discharge capacity.For some reason, it is difficult to set the replacement cycle for the secondary battery, and furthermore, the device may break down due to other reasons. It has been extremely difficult to manage secondary batteries because there is no guarantee that they will remain in the same location for a long time. For this reason, when installing a secondary battery in a terminal device that requires high reliability, it is recommended to replace it regularly earlier than its estimated lifespan, or to decide when to replace it by counting the number of repeated charging and discharging cycles. Must be used and maintenance effort.

It had drawbacks such as high cost.

In addition, a method for easily estimating battery performance deterioration is to measure and judge the discharge capacity under certain test conditions, but when implementing this method, the entire secondary battery must be removed from the terminal device. Furthermore, since it takes a long time to make the determination, K applied to the communication terminal devices installed in large numbers in a wide area has the drawback of being too expensive, including for maintenance personnel.

In view of the above-mentioned conventional drawbacks, the present invention has been made to enable easy and accurate monitoring of the life span, replacement timing, etc. of a secondary battery. A comparison circuit that compares the voltage, a quick charge circuit that supplies a predetermined value of quick charge current to the secondary battery, a pseudo discharge circuit that discharges a predetermined value of discharge current from the secondary battery, and a pseudo discharge circuit that controls each of the above operations. and a control unit, when the comparison circuit detects that the terminal voltage of the secondary battery has dropped below a reference voltage, the control unit charges the secondary battery with the predetermined quick charging current for a predetermined time; The spare for a terminal device is further characterized in that deterioration of the secondary battery is determined by discharging it for a predetermined period of time in the pseudo discharge circuit and again comparing the terminal voltage of the secondary battery with a reference voltage in the comparison circuit. A power supply monitoring system, a comparison circuit that compares the terminal voltage of the secondary battery with a predetermined reference voltage, a variable charging circuit that can set the charging current value to any value, and a discharge current of the secondary battery to a predetermined value. comprising a pseudo discharge circuit that discharges the , and a control section that controls each of the operations,
The control section normally causes the variable charging circuit to supply a trickle charging current to the secondary battery, and when the comparison circuit detects that the terminal voltage of the secondary battery has dropped below a reference voltage, the variable charging circuit supplies a trickle charging current to the secondary battery. A rapid charging current having a value of A method for monitoring a standby power source for a terminal device is characterized in that a determination is made.

The drawings will be explained in detail below.

Fig. 1 shows a first embodiment of the power supply section of a communication terminal device to which the method of the present invention is applied. A load circuit of the terminal device, 5 is a first timer circuit, 6 is a trickle charging circuit, 7 is a secondary battery consisting of a plurality of cells, 8 is a switching circuit,
9 is a quick charging circuit, 10 is a pseudo discharge circuit, 11 is a second timer circuit, 12 is a control section, 13 is a power failure detection circuit, 1
4f”J comparison circuit.

The first timer circuit 5 outputs DC power supplied from the rectifier/smoothing circuit 3 to the water trickle charging circuit 6 or the quick charging circuit 9 in accordance with a command from the control section 12. Normally, power is output continuously to the trickle charging circuit 6, but the quick charging circuit 9vC outputs power for a preset time (this time can be set arbitrarily, but it is generally not intended for complete charging, so it is relatively Power is output only for a short period of time), and power to the trickle charging circuit 6 is stopped while power is being output to the quick charging circuit 9 and during the discharging period during the test described later. It has become. Trickle charging circuit 6
0.020 to 0 required for trickle charging of the secondary battery 7
．． 10 (Here, C is the current value obtained by dividing the rated capacity of the secondary battery 7 by 1 hour.) A constant current is supplied to the secondary battery 7 at an arbitrary current value within the range of 10. The disconnected quick charging circuit 9 supplies a constant current to all the secondary batteries 7 at an arbitrary current value within the range of 0.050 to 0.50 necessary for quick charging of the secondary batteries 7. There is.

The pseudo discharge circuit 10 is constituted by a constant current circuit, a fixed resistor, etc., and is set to discharge a current of about 0.50 to IC from the secondary battery 7. Further, the second timer circuit 11 operates the pseudo discharge circuit 10 according to the command from the control unit 12.
'fr: Operates only for a predetermined time, and the discharging time is arbitrarily set within a range where the product of the discharging current value and the discharging time is smaller than the product of the rapid charging current value and the charging time.

The switching circuit 8 connects and connects the load circuit 4 and the secondary battery 7 in accordance with a command from the control section 12 . The power failure detection circuit 13 is configured to send information to the control unit 12 when the commercial power supply fails.

The comparator circuit 14 compares the terminal voltage of the secondary battery 7 with the reference voltage at all times, when using a terminal device, or in response to a command from a remote station in accordance with the command from the control unit 12, and then transmits the result to the entire control unit 12. It's like sending it out. The terminal voltages may be compared during trickle charging or discharging, or when the charging circuits 6, 9 and the discharging circuit 10 are all turned off. Note that the solid lines connecting the circuits in the figure represent power lines, and the broken lines represent information lines, respectively.

Next, the operation will be explained. Normally, the load circuit 4 is supplied with DC power obtained by rectifying and smoothing commercial AC power input through the input terminals 1 and 2 in a rectifier/smoothing circuit 3. At this time, the switching circuit 8 is in the off state, and the secondary battery 7 is trickle charged by the current supplied from the trickle charging circuit 6. If the commercial power supply fails while the terminal device is in use, or if an attempt is made to use the terminal device during a power outage, the power failure detection circuit 13 detects the power outage of the commercial power supply and sends this information to the control unit 1.2VC. When the control unit 12 receives this information, it turns on the switching circuit 8 to supply DC power from the secondary battery 7 to the load circuit 4, thereby maintaining full serviceability.

When the comparator circuit 14 detects that the terminal voltage of the secondary battery 7 has fallen below the reference voltage, the control unit 12 checks whether or not there is a power outage in the commercial power supply based on the information from the power outage detection circuit 13, and determines whether or not there is a power outage. doesn't do anything about it. On the other hand, when there is no power outage, the timer circuit 5 is activated, the trickle charging circuit 6 is turned off, and the quick charging circuit 9 is turned on, so that the secondary battery 7 is charged quickly.

When the charging time of the quick charging has elapsed, the control section J2 activates the timer circuit 1], k to turn on the pseudo discharge circuit 10 and completely start discharging from the secondary battery 7. When the discharge time has elapsed, the control unit 12 checks all the information in the comparator circuit 14 again. At this time, if the terminal voltage of the secondary battery 7 is equal to or higher than the reference voltage, it is determined that the previous drop in the terminal voltage is simply due to insufficient charging, and the normal operating state is restored.

On the other hand, if the terminal voltage of the secondary battery 7 is still below the reference voltage even after the light/discharge is performed, the control unit 12 controls the secondary battery 7.
It is determined that the performance has deteriorated. Note that the determination result can be displayed on a display unit (not shown) or automatically transmitted to the central office using a predetermined subscriber line signal, if necessary.

FIG. 2 shows a second embodiment of the present invention, in which hatch-trickle charging and quick charging are performed using a single charging circuit. That is, reference numeral 15 in the figure is a variable charging circuit in which the charging current can be changed arbitrarily, and the charging time is controlled by the timer circuit 5, and the current value is controlled by the damping section 12. Note that the other configurations and effects are the same as those of the first embodiment.

2. As explained above, according to the present invention, there are provided a comparison circuit that compares the terminal voltage of the secondary battery with a predetermined reference voltage, and a quick charge circuit that supplies the entire quick charge current of a predetermined value to the secondary battery. , comprising a pseudo-discharge circuit that discharges a predetermined value of discharge current from the secondary battery, and a control unit that controls each of the above operations, and the control unit is configured to detect that the terminal voltage of the secondary battery is equal to or lower than the reference voltage in the comparison circuit. When it is detected that the secondary battery has dropped to the reference voltage, the rechargeable battery is charged with the predetermined rapid charging current for a predetermined time, further discharged by the pseudo discharge circuit for a predetermined time, and the comparison circuit again sets the terminal voltage of the secondary battery to the reference voltage. Since the deterioration of the secondary battery is determined by comparison, it is possible to detect the terminal voltage without taking out the secondary battery as a backup power source, and it is possible to detect a decrease in the terminal voltage due to the use of the secondary battery during a power outage. It is possible to accurately determine whether the problem is due to a normal decrease in battery capacity or a deterioration in the performance of the secondary battery, and therefore the effort and cost of maintaining and managing the secondary battery can be reduced. Further, if a variable charging circuit is used to supply trickle charging current and rapid charging current, there are advantages such as only one charging circuit is required and the configuration is simpler.

[Brief explanation of drawings]

The drawings serve to explain the present invention, and FIG. 1 is a block diagram showing a first embodiment of a power supply section of a communication terminal device to which the method of the present invention is applied, and FIG. 2 is a block diagram showing a second embodiment of the present invention. FIG. 2 is a block diagram illustrating an example. ■, 2... Commercial power supply input terminal, 5.11... Timer circuit, 7... Secondary battery, 9... Rapid charging circuit,
1, 0...Pseudo discharge circuit, 14...Comparison circuit, 15...
...Variable charging circuit. Patent Applicant Nippon Telegraph and Telephone Public Corporation Agent Patent Attorney Yoshi 1) Takashi Sei

Claims (2)

[Claims] (1) A comparison circuit that compares the terminal voltage of the secondary battery with a predetermined reference voltage, a quick charge circuit that supplies a predetermined value of quick charge current to the secondary battery, and a predetermined value of discharge from the secondary battery. The controller includes a pseudo-discharge circuit that completely discharges the current, and a control unit that controls each of the operations, and when the comparison circuit detects that the terminal voltage of the secondary battery has dropped below the reference voltage, the control unit Determination of secondary battery deterioration is determined by charging the battery with the predetermined quick charging current for a full predetermined time, further discharging the battery in the pseudo discharge circuit for a predetermined time, and again comparing the terminal voltage of the secondary battery with the reference voltage in the comparison circuit. A method for monitoring backup power supplies for terminal equipment that has all the features that we have developed. (2) A comparison circuit that compares the terminal voltage of the secondary battery with a predetermined reference voltage, a variable charging circuit that can set the charging current to any value, and a discharge current of a predetermined value from the secondary battery. comprising a pseudo discharge circuit and a control section that controls each of the operations,
The control section normally causes the variable charging circuit to supply trickle charging current to the secondary battery, and when the comparison circuit detects that the terminal voltage of the secondary battery has dropped below a reference voltage, the control section causes the variable charging circuit to supply a predetermined trickle charging current to the secondary battery. The rapid charging current of the value is supplied to all the secondary batteries for a predetermined time, and the pseudo discharge circuit is further discharged for a predetermined time, and the comparator circuit again compares the terminal voltage of the secondary battery with the reference voltage. A monitoring method for a standby power source for a terminal device, which has all the features of making a determination.