JPH026291B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a power supply control system for supplying power from a commercial power source and a backup secondary battery during a power outage.

[Background of the invention]

Conventionally, for devices that are powered by commercial power and secondary batteries for backup during commercial power outages,
There are two purposes for using secondary batteries.

One of these is to continue the service provided by the device using power from the commercial power source to a certain point even in the event of a power outage of the commercial power source, using a secondary battery, thereby eliminating damage to the user. for example,
If the computer loses power during processing, the contents of memory and registers are saved to magnetic tape using power supplied from the secondary battery.If the power goes out while the elevator is in operation, the power from the secondary battery is used to move the elevator to the nearest It may be stopped on the floor. In these cases, a method of backing up with a capacitor instead of a secondary battery can be considered, but this has the disadvantage that the scale of the device becomes too large, so a secondary battery is generally used.

The second purpose of using a secondary battery is to allow the device to provide the same service both when commercial power is on and during a power outage.

Although the above is the purpose of using conventional secondary batteries, there are two problems.

The first problem is that when using a secondary battery for the latter purpose, if there is no means to estimate the remaining capacity of the secondary battery, the user may run out of the secondary battery due to a long power outage. may cause unexpected damage.

The second problem is that the secondary battery deteriorates and the terminal voltage does not rise to the specified value even if charging continues, or the specified current does not flow even though the terminal voltage is at the specified value. This situation occurs. If such a degraded secondary battery is installed and a power outage occurs while normal service is being provided using commercial power, the specified amount of power cannot be obtained from the secondary battery, causing damage to the user. be.

[Purpose of the invention]

The purpose of the present invention is to avoid as much as possible the situation where the power supply is stopped while the service is not completed due to a power outage of the commercial power supply, and the service is left in the incomplete state in order to solve the problems of the conventional technology as described above. It is an object of the present invention to provide a power supply control system configured to drastically reduce damage to users caused by such problems.

[Summary of the invention]

In order to achieve the above object, the present invention provides a commercial AC power outage determination circuit for detecting a power outage state of the commercial AC power source in an apparatus that provides a service using power supplied from a commercial AC power source or a secondary battery; A secondary battery voltage drop determination circuit and a secondary battery deterioration determination circuit are provided to detect a voltage drop or deterioration state of the secondary battery, respectively, and the secondary battery deterioration determination circuit detects the deterioration state of the secondary battery. and when the secondary battery voltage drop determination circuit detects a voltage drop of the secondary battery and the commercial AC power supply power failure determination circuit detects a power outage of the commercial AC power supply, the services provided by the device are reduced. By starting or stopping the service, it is possible to avoid the situation where the power supply is stopped while the service is not completed, and the damage caused to the user is drastically reduced.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram of a power supply control system according to an embodiment of the present invention, and this example is a power supply control system for a public telephone that uses magnetic cards and coins.

At public telephones that accept magnetic cards and currency exchange,
We provide a paid call service using magnetic cards or coins, but if the secondary battery is deteriorating or the voltage of the secondary battery is low and there is a power outage, the magnetic card call service will be suspended. ing.

In Figure 1, 1 is an AC/DC converter that converts a commercial AC power supply to a constant DC voltage, 2 is a secondary battery consisting of a single cell or multiple cells, 3 is a device control system that operates on local power supply, and 4 is a A commercial AC power outage determination circuit (hereinafter referred to as ACD (AC Down) determination circuit) for detecting a power outage state of the commercial AC power supply, 5
is a secondary battery voltage determination circuit (hereinafter referred to as BTV (BaTtery Voltage) determination circuit) that compares the terminal voltage of the secondary battery with a constant value and detects a voltage drop of the battery;
6 is a secondary battery deterioration determination circuit (hereinafter referred to as BTD (BaTtery Down)) that detects the state in which the secondary battery has deteriorated.
7 is a power supply circuit, 8 is a DC/DC converter that converts the power of the station power supply system, 9 is a card processing system, and 12 is a fraud processing system. 13 is
A BTL (BaTtery Level) generation circuit is shown which detects a power outage and a voltage drop state of the secondary battery from the ACD signal from the ACD judgment circuit 4 and the BTV signal from the BTV judgment circuit 5. It has a communication control section 10 and a power supply control section 11 that perform communication. The card processing system 9 is operated by power supplied from a commercial AC power source or the secondary battery 2. In FIG. 1, single lines indicate signal lines, and double lines indicate power supply lines.

Here, ACD signal, BTV signal, BTL signal,
The logic of the BTD signal is that when it is at the 'L' level, it indicates a commercial power outage state, a secondary battery voltage drop state, a commercial power outage and secondary battery voltage drop state, and a secondary battery deterioration state. It is a negative logic indicating the opposite state. The reason for using negative logic is as follows. In other words, when the respective circuits that generate the four signals, the ACD judgment circuit 4, the BTV judgment circuit 5, the BTL creation circuit 13, and the BTD judgment circuit 6 are operated by power supply from the commercial power supply or the secondary battery 2, Assuming that the power supply also disappears, even if the above four signals try to output an 'H' signal, since there is no power supply, only an 'L' signal can be output. The power supply is interrupted when the terminal voltage of the secondary battery is low or in a deteriorated state.
Occurs when there is a power outage.

On the other hand, in order to reverse the logic, that is, to make it positive logic, it is necessary to provide means for holding or recording the four signals when the power supply from the commercial battery or secondary battery 2 is interrupted. Specifically, there are a method of holding the four signals using a third external power source, a method of recording the four signals optically, mechanically, or magnetically before the power supply is interrupted. However, since either method increases the size and cost of the device, the method using positive logic is not a good idea. Therefore, this embodiment employs negative logic, and the following explanation will also be based on negative logic.

FIG. 2 shows the state of the commercial power supply, the state of the secondary battery 2, and serviceability in each state of the BTL signal and BTD signal while the device control system 3 is operating.
Note that regarding serviceability, it is assumed that the call service using the card is stopped when the commercial power supply is interrupted when the secondary battery 2 is in a deteriorated state or in a low voltage state.

(1) When both BTL and BTD signals are 'H':
Since the secondary battery 2 is not in a deteriorated state and the power supply is normally secured by the commercial power supply or the secondary battery 2, the normal money service and card service are continued.

(2) When the BTL signal is 'H' and the BTD signal is 'L':
The 'H' of the BTL signal indicates that the power supply is secured by either the commercial power supply or the secondary battery 2, but since the BTD signal is 'L', the secondary battery 2 eventually deteriorates. It can be seen that power cannot be supplied in this state, and power is supplied only from commercial power. Therefore, if a card-based service were to be provided in this state, when the commercial power supply goes out, power would not be supplied from anywhere and the card would not be returned to the user. In order to avoid such damage, in this embodiment, the device control system 3 that has received the BTD'L' signal performs processing to disconnect the card processing system 9 while power supply from the commercial power source is secured. A flowchart of this process is shown in FIG.

In Figure 2, the flow on the right side is the device control system 3.
, the flow on the left side shows the flow of the card processing system 9.

The device control system 3 communicates with the third processing system 9 and informs it that the card service should be stopped (301, 901). The card processing system 9 performs recovery processing such as immediately returning the card (902), and after completing the processing, notifies the device control system 3 that the recovery has been completed (903). Then, the device control system 3 performs control to cut off the power supply from the power supply circuit 7 to the card processing system 9 (302, 303). Eventually, the power supply to the card processing system 9, which operates on commercial power supply or the secondary battery 2, is stopped and the card service is stopped, but the power supply to the device control system 3 and the fraud processing system 12, which operate on the central power supply, is Since it continues, it is possible to provide services using money.

A possible problem here is that if a power outage occurs before or during release of the card processing system 9, the power supply to the card processing system 9 will suddenly stop, and the card may not be returned, causing damage to the user. There is. However, since the device control system 3 can identify whether or not the secondary battery 2 has deteriorated based on the BTD signal, it is also possible to notify the maintenance personnel through the processing of the device control system 3. If 2 deteriorates, it is easy to replace it at an early stage. For this reason, power outage while the secondary battery 2 is deteriorating can be avoided as much as possible.

(3) When the BTL signal is 'L' and the BTD signal is 'H':
Since the BTL signal is 'L', the commercial power supply is out of power and the voltage of the secondary battery 2 is low.
Since the BTD signal is 'H', the secondary battery 2 has not deteriorated. Therefore, although the voltage of the secondary battery 2 has decreased, the remaining capacity is only small, and there is still some surplus power left as a power supply, so the secondary battery 2 can be used to perform the above (2). Stop the card service using the procedure described above.

(4) When both BTL signal and BTD signal are 'L':
Below are the times when this situation occurs. Although the commercial power supply is out of power, the secondary battery 2 is not in a low voltage state and the BTL signal shows 'H', and the secondary battery 2 has not deteriorated and the BTD signal shows 'H'. , while performing a service using a card, the voltage of secondary battery 2 decreased and BTL
The signal becomes 'L' and the secondary battery 2 has deteriorated.
This is when the BTD signal also becomes "L". At this time, the power supply to the card processing system is stopped without the card processing system being disconnected, and the card is left in a state where the service is not completed, causing a problem. However, the probability of such a change is extremely low.

Generally, when both the BTL signal and the BTD signal are 'L', it is unknown whether or not the secondary battery 2 has deteriorated, so replace the secondary battery 2 when the secondary battery 2 has deteriorated. Although it is not known whether the work can be performed or not, since the service has been stopped, there will be no harm to the users. Then, once the commercial power supply is restored and the power is turned on, the operation of the BTD determination circuit 6 will determine whether or not there is deterioration, so there will be no problem.

A flowchart of the processing of the apparatus control system 3 according to this method is shown in FIG. The following processing is performed at fixed intervals by the timer. If the card service is continuing (401), the BTD signal is monitored (402), and if it is 'L', the secondary battery 2 has deteriorated, so a notification process to the maintenance personnel and the card processing system 9 Performs separation processing (404, 405). When the BTD signal is 'H', the BTL signal is monitored (403), and when it is 'L', the commercial battery is in a power outage and the voltage of the secondary battery 2 is low, so the card processing system 9 performs disconnection processing. (405).

In this way, if the secondary battery deteriorates while providing card-based services, or if the applicable power supply fails while the voltage of the secondary battery is low, by disconnecting the card processing system, It is possible to prevent damage caused to the user due to uncompleted service, such as when the power supply is suddenly stopped during the service using the card and the card is not returned.

Also, in the above explanation, the device control system 3 is the BTL
Although power supply control has been performed by monitoring signals and BTD signals, there is also a method in which the card processing system 9 monitors BTL signals and BTD signals and controls power supply. Furthermore, in FIG. 1, the BTD determination circuit 6, the ACD determination circuit 4,
Although the BTV determination circuit 5 and the BTL creation circuit 13 are configured to be supplied with power from the power supply circuit 7,
There is a configuration in which power is supplied from the AC/DC converter 1 or secondary battery 2, and if the power consumption of the four circuits mentioned above is small, there is also a configuration in which power is supplied by a semi-permanent and simple separate power source, such as a primary battery, all of which are equivalent. The effects can be expected.

In addition, in the embodiments described so far, in addition to the commercial power supply and the secondary battery 2, there is a separate station power supply, which operates the device control system 3 and outputs the BTD signal.
It was intended to reduce service from monitoring BHL signals. However, if there is no separate power source such as the above-mentioned local power source, the device control system 3 and the money processing system 12
will be supplied with power from the power supply circuit 7, and the only difference is the range of service suspension due to the difference in power supply configuration, but the state of each power supply for each state of the BTL signal and BTD signal remains the same. in this case,
The device control system 3 monitors BTD and BTL and controls the entire service to be stopped as necessary, that is, controls the power supply circuit 7 after completing the recovery of the entire device including the device control system 3 itself. becomes.

〔Effect of the invention〕

As explained above, according to the power supply method according to the present invention, it is possible to avoid as much as possible the situation where the power supply is stopped while the service is not completed due to a power outage of the commercial power source, and to reduce the damage to the user caused by leaving the service in the incomplete state. It can be drastically reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a power supply control system according to an embodiment of the present invention, and FIG.
BTL signal, BTD signal status and power supply status,
Figure 3 is a flowchart showing the procedure for disconnecting the card processing system in Figure 1, and Figure 4 is a flowchart showing the procedure for power supply control of the device control system in Figure 1. be. 1: AC/DC converter, 2: Secondary battery, 3:
Device control system, 4: ACD judgment circuit, 5: BTV judgment circuit, 6: BTD judgment circuit, 9: Card processing system,
12: Money processing system, 13: BTL creation circuit.

Claims (1)

[Claims] 1. In a device that provides a service using power supplied from a commercial AC power source or a secondary battery,
A commercial AC power outage determination circuit that detects a power outage state of the commercial AC power supply, and a secondary battery voltage drop determination circuit and a secondary battery deterioration determination circuit that respectively detect a voltage drop or deterioration state of the secondary battery,
When the secondary battery deterioration determination circuit detects a deterioration state of the secondary battery, and the secondary battery voltage decrease determination circuit detects a decrease in the voltage of the secondary battery, and the commercial AC power supply power failure determination circuit If a power outage of the commercial AC power supply is detected by
A power supply control method characterized by reducing or stopping services provided by the device. 2. When the signals obtained from the commercial AC power supply power failure determination circuit, the secondary battery voltage drop determination circuit, and the secondary battery deterioration determination circuit are at logic level 'L', the commercial AC power supply power failure and the secondary battery 2. The power supply control system according to claim 1, wherein the power supply control system is configured using negative logic that indicates a decrease in battery voltage and a deterioration state of the secondary battery.