JPH10336891A - Deterioration detection system for backup power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect deterioration, by adding power supply time count to past supply time count being stored on previous backup for calculating cumulative power supply time from a backup power supply, and by storing and displaying the cumulative power supply time from the backup power supply. SOLUTION: When the voltage of a main battery 2 becomes lower than a specific voltage, a power supply switch 4 switches power supply for a load 5 from the main battery 2 to a sub battery 3 and sends a main battery off signal and a sub battery on signal to a timer 6. After the count of the lapse time of the main battery 2 is stopped, the timer 6 sends the elapse time to a cumulative addition part 7. The cumulative addition part 7 adds the elapse time being sent from the timer 6 to the past cumulative supply time of the main battery 2 being stored at a storage part 8. The cumulative addition part 7 sends an addition result to the storage 8 for updating and storing a memory for the main battery 2, and at the same time informs a display 9 that the addition has been terminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting deterioration of a backup power supply such as a battery or a supercapacitor for supplying power to a load instead of the main power supply when the main power supply is cut off, and more particularly, to a cumulative power supply from the backup power supply. The present invention relates to a method for detecting a deterioration of a backup power supply, which detects a deterioration state based on the number of supply hours.

[0002]

2. Description of the Related Art As an example of a conventional backup power supply system, there is a backup circuit for a semiconductor memory disclosed in Japanese Patent Application Laid-Open No. 7-271681. FIG. 3 is a diagram showing a backup circuit of this publication, in which a main power supply 1, a super capacitor 10, and a backup primary battery 11
, A voltage detection circuit 12, a power supply switch 13, a diode 14, and a semiconductor memory 15.

In such a configuration, the voltage supplied from the main power supply 1 is supplied to the semiconductor memory 15 via the power supply switch 13. When the voltage supplied from the main power supply 1 decreases, the main power supply 1 and the super capacitor 10 are separated by the diode 14, and power is supplied from the super capacitor 10 to the semiconductor memory 15.

Further, when the voltage of the supercapacitor 10 falls below a predetermined voltage, the voltage is detected by a voltage detecting circuit 12, and a power supply switch 13 supplies power to the semiconductor memory 15 from the supercapacitor 10 to the backup primary battery. Switch to 11.

[0005]

However, in the above-mentioned prior art, there is a problem that the deterioration state of a backup power supply such as a supercapacitor or a backup battery due to long-term use cannot be grasped, so that preventive maintenance such as replacement cannot be performed. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a backup power supply deterioration detection method which enables preventive maintenance such as replacement by grasping the state of deterioration of the backup power supply.

[0007]

According to a first method of detecting deterioration of a backup power supply of the present invention, a deterioration state of a backup power supply such as a battery or a supercapacitor for supplying power to a load in place of the main power supply when the main power supply is cut off. A method of detecting the deterioration of the backup power supply, which counts the time during which power is supplied from the backup power supply when the main power supply is cut off, and sums the counted time with the past power supply time stored at the time of the previous backup. It is characterized in that the accumulated power supply time from the backup power supply is calculated and the deterioration status is detected by storing and displaying the accumulated power supply time from the backup power supply.

A second method of detecting the deterioration of a backup power supply according to the present invention is a method of detecting the deterioration of a backup power supply such as a battery or a super capacitor for supplying power to a load in place of the main power supply when the main power supply is cut off. A deterioration detection method, which counts the time during which power is supplied from the backup power supply due to the main power interruption, and sums the counted time with the past power supply time stored at the time of the previous backup to accumulate the accumulated power from the backup power supply. Calculating a power supply time, storing and displaying the cumulative power supply time from the backup power supply, and detecting a deterioration state by performing an alarm display when the cumulative power supply time is equal to or longer than a preset reference time. It is characterized by.

A third method for detecting deterioration of a backup power supply according to the present invention is the method for detecting deterioration of the first or second backup power supply of the present invention, wherein the cumulative power supply time is determined when the plurality of backup power supplies are provided. It is characterized in that it is calculated, stored, and displayed for each backup power supply.

A fourth method of detecting deterioration of a backup power supply according to the present invention is a method of detecting deterioration of a backup power supply such as a battery or a super capacitor for supplying power to a load in place of the main power supply when the main power supply is cut off. The main power supply, the backup power supply, and switching to the backup power supply when the main power supply is turned off, transmitting a backup power supply on signal to a timer unit, detecting the re-input of the main power supply, and transmitting a backup power supply off signal to the timer unit. A power supply switching unit for transmitting, and counting by receiving the backup power-on signal, and stopping counting by receiving the backup power-off signal, thereby counting a power supply time from the backup power supply and accumulative adding unit. And a power supply time received from the timer unit is stored in the storage unit. The cumulative power supply time is calculated by adding the total power supply time to the past power supply time, and the cumulative power supply time is transmitted to the storage unit. The cumulative power supply time from the cumulative addition unit is stored and updated. And a display unit for displaying the accumulated power supply time.

A fifth method of detecting deterioration of a backup power supply according to the present invention is a method of detecting deterioration of a backup power supply such as a battery or a supercapacitor for supplying power to a load in place of the main power supply when the main power supply is cut off. The main power supply, the backup power supply, and switching to the backup power supply when the main power supply is turned off, transmitting a backup power supply on signal to a timer unit, detecting the re-input of the main power supply, and transmitting a backup power supply off signal to the timer unit. A power supply switching unit for transmitting, and counting by receiving the backup power-on signal, and stopping counting by receiving the backup power-off signal, thereby counting a power supply time from the backup power supply and accumulative adding unit. And a power supply time received from the timer unit is stored in the storage unit. The cumulative power supply time is calculated by adding the cumulative power supply time to the past power supply time, and the cumulative power supply time is transmitted to the storage unit. The cumulative power supply time from the cumulative addition unit is stored and updated. And a storage unit for displaying the cumulative power supply time and comparing the cumulative power supply time with a preset reference time to display an alarm when the cumulative power supply time is equal to or longer than the reference time. And a display unit.

[0012]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention. A main power supply 1, a main battery 2, a sub-battery 3, a main power supply 1, a main battery 2, and a sub-battery 3 are connected. A power supply switching unit 4 for switching, a load 5, a timer unit 6 for counting the power supply time from the main battery 2 and the sub-battery 3 each time, and a cumulative addition for accumulating the power supply time from the main battery 2 and the sub-battery 3 A storage unit 8 for storing the accumulated power supply time from the main battery 2 and the sub-battery 3, and a display unit 9 for displaying the accumulated power supply time from the main battery 2 and the sub-battery 3.

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

Normally, the voltage of the main power supply 1 is
(Step S1).

In the state of step S1, the power supply switching section 4 continues to detect whether or not the voltage of the main power supply 1 is higher than a predetermined voltage (step S2).

In step S2, when the voltage of the main power supply 1 is lower than the predetermined voltage, the switching unit 4 switches the power supply to the load 5 from the main power supply 1 to the main battery 2 (step S3).

The power supply switching section 4 switches the power supply to the load 5 from the main power supply 1 to the main battery 2 in step S3, and transmits a main battery ON signal to the timer section 6 (step S4).

The timer section 6 receives the main battery ON signal and starts counting the elapsed time (step S5).

After switching to the main battery 2 in step S3, the power supply switching section 4 continues to detect whether or not the voltage of the main battery 2 is higher than a predetermined voltage (step S6).

In step S6, when the voltage of the main battery 2 falls below a predetermined voltage, the power supply switching unit 4 switches the power supply to the load 5 from the main battery 2 to the sub-battery 3 (step S7), and An off signal and an auxiliary battery on signal are transmitted to the timer section 6 (step S8).

The timer section 6 receives the main battery off signal, stops counting the elapsed time of the main battery 2, receives the sub battery on signal, and starts counting the elapsed time of the sub battery 3 (step S9). ).

After stopping the counting of the elapsed time of the main battery 2 in step S9, the timer section 6 transmits the elapsed time to the accumulating section 7 (step S10).

The cumulative addition section 7 adds the elapsed time transmitted from the timer section 6 to the past cumulative supply time of the main battery 2 stored in the storage section 8 (step S11).

The accumulator 7 sends the result of the addition in step S11 to the memory 8 to update the memory for the main battery 2,
At the same time, the addition is notified to the display unit 9. The display unit 9 displays the accumulated supply time of the main battery 2 stored in the storage unit 8 (Step S12).

After switching to the sub-battery 3 in step S7, the power supply switching section 4 continues to detect whether or not the voltage of the sub-battery 3 is higher than a predetermined voltage (step S13).

In step S13, when the voltage of the sub-battery 3 falls below the predetermined voltage, the power supply switching unit 4 stops the power supply to the load 5 (step S14) and sends a sub-battery off signal to the timer unit 6. It transmits (step S15).

The timer section 6 receives the sub-battery off signal and stops counting the elapsed time of the sub-battery 3 (step S).
16).

After stopping the counting of the elapsed time of the sub-battery 3 in step S16, the timer section 6 transmits the elapsed time to the accumulating section 7 (step S17).

The accumulation unit 7 adds the elapsed time transmitted from the timer unit 6 to the past accumulated supply time of the sub-battery 3 stored in the storage unit 8 (step S18).

The accumulator 7 sends the result of the addition in step S18 to the storage 8 to update the memory for the sub-battery 3,
At the same time, the addition is notified to the display unit 9. . The display unit 9 displays the accumulated supply time of the sub-battery 3 stored in the storage unit 8 (Step S19).

In steps S2, S6 and S13, if the voltage is equal to or higher than the predetermined value, power is supplied from each power supply to the load 5 (step S20).

While one embodiment of the present invention has been described above, as another embodiment of the present invention, in step S12 or step S19, the display unit 9 displays the accumulated supply time stored in the storage unit 8. , And
By comparing this accumulated supply time with a preset time,
It is also possible to display an alarm when the cumulative supply time becomes equal to or longer than a preset number of hours.

The case where two batteries, a main battery and a sub-battery, are used as a backup power source has been described. However, it is clear that the present invention can be applied to the case of a backup system using one battery.

Further, a super capacitor or the like may be used instead of the main battery.

[0037]

As described above, according to the present invention, the accumulated power supply time from the backup power supply such as a battery or a supercapacitor can be ascertained. There is an effect that maintenance becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a diagram showing a conventional backup circuit.

[Explanation of symbols]

 Reference Signs List 1 main power supply 2 main battery 3 sub-battery 4 power supply switching unit 5 load 6 timer unit 7 accumulative addition unit 8 storage unit 9 display unit

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H02J 9/00 H01G 9/00 301Z

Claims (5)

[Claims] 1. A backup power supply deterioration detection method for detecting a deterioration state of a backup power supply such as a battery or a super capacitor for supplying power to a load in place of the main power supply when the main power supply is cut off. The power supply time from the backup power supply is counted, and the counted time is added to the past power supply time stored at the time of the previous backup to calculate the cumulative power supply time from the backup power supply. A deterioration detection method for a backup power supply, wherein a deterioration state is detected by storing and displaying the accumulated power supply time. 2. A method of detecting a deterioration of a backup power supply such as a battery or a supercapacitor that supplies power to a load in place of the main power supply when the main power supply is turned off. The power supply time from the backup power supply is counted, and the counted time is added to the past power supply time stored at the time of the previous backup to calculate the cumulative power supply time from the backup power supply. A deterioration detection method for a backup power supply, which stores and displays an accumulated power supply time, and detects an deterioration state by displaying an alarm when the accumulated power supply time is equal to or longer than a preset reference time. 3. The cumulative power supply time is calculated, stored, and displayed for each backup power supply when there are a plurality of backup power supplies.
Or the deterioration detection method of the backup power supply according to 2. 4. A deterioration detection method for a backup power supply such as a battery or a supercapacitor that supplies power to a load instead of the main power supply when the main power supply is cut off, wherein the main power supply, the backup power supply, and the main power supply A power switchover unit that switches to the backup power supply and transmits a backup power-on signal to the timer unit when the power supply is turned off, detects a re-input of the main power supply, and transmits a backup power-off signal to the timer unit; Receiving the backup power-off signal to stop counting,
A timer unit that counts the power supply time from the backup power supply and sends it to the accumulative addition unit; and accumulates the power supply time received from the timer unit with the past power supply time stored in the storage unit. A cumulative addition unit for calculating a supply time and transmitting the cumulative power supply time to the storage unit; a storage unit for storing and updating the cumulative power supply time from the cumulative addition unit; and displaying the cumulative power supply time. A display unit, and a method for detecting deterioration of a backup power supply. 5. A deterioration detection method for a backup power supply such as a battery or a supercapacitor for supplying power to a load in place of the main power supply when the main power supply is cut off, wherein the main power supply, the backup power supply, and the main power supply A power switchover unit that switches to the backup power supply and transmits a backup power-on signal to the timer unit when the power supply is turned off, detects a re-input of the main power supply, and transmits a backup power-off signal to the timer unit; Receiving the backup power-off signal to stop counting,
A timer unit that counts the power supply time from the backup power supply and sends it to the accumulative addition unit; and accumulates the power supply time received from the timer unit with the past power supply time stored in the storage unit. A cumulative addition unit for calculating a supply time and transmitting the cumulative power supply time to the storage unit; a storage unit for storing and updating the cumulative power supply time from the cumulative addition unit; and displaying the cumulative power supply time. A backup unit that compares the cumulative power supply time with a preset reference time and displays an alarm when the cumulative power supply time is equal to or longer than the reference time. Deterioration detection method.