JPH0312575A - Estimating device for consumed state of backup battery - Google Patents

Abstract

PURPOSE:To estimate a consumed state of a backup battery by measuring the time when a main power source stops an electric power supply, adding the measured time and collating the obtained time. CONSTITUTION:When a DC power source 4 is turned off, a time measuring and adding means 1 reads the date and hour immediately before turn-off from a timer 8 and stores it in a RAM 7. Subsequently, the RAM 7 holds data of an electric power supply stop time measured before, and on the other hand, sends out continuously the date and hour data of a current supply of a backup battery 9. Next, when the power source 4 is turned on again, the date and hour immediately after that is read by a CPU 5, the electric power supply stop time is derived from the date and hour immediately before turn-off of the power source 4 stored in the RAM 7, and when it is the stop time derived before, they are added and the total electric power supply stop time is derived. Also, the CPU 5 estimates a consumed state corresponding to the electric power supply stop time obtained by the means 1, that is, the feeding time of the battery 9, based on consumed state data of the battery 9 stored in a ROM 6, and displays 3 the replacement time and the remaining service life of the battery 9.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a backup amplifier for estimating the consumption state of a backup battery that supplies power in place of the main power supply when the main power supply stops supplying power to a computer device or the like. This invention relates to a device for estimating battery consumption status B.

(Prior Art) In computer devices, data stored in RAM is lost when the power supply from the main power supply to the RAM is cut off.Therefore, in the past, data stored in the RAM is lost even when the power supply from the main power supply is cut off. RA with a backup battery to retain stored data.

Power was being supplied to M.

In addition, the replacement of the backup battery as described above was performed by measuring the output voltage and determining the state of consumption.

[Problem to be solved by the invention]

However, in the conventional configuration described above, it is necessary to provide a measurement circuit in order to measure the output voltage of the backup battery.
This led to larger and more expensive equipment. Furthermore, since the output voltage of the backup battery rapidly decreases as it approaches the end of its lifespan, it is possible to know the battery's depletion state only when the power supply is about to become impossible, which may lead to incorrect timing of replacing the backup battery.

[Means to solve the problem]

The backup battery consumption state estimation device according to the present invention includes:
In order to solve the above problem, in an auxiliary power supply device equipped with a backup battery that supplies power while the main power supply stops supplying power, the time period during which the main power supply stops supplying power is The present invention is characterized by comprising a time measurement and addition means for measuring and adding the measured time, and a consumption state estimation means for estimating the state of consumption of the bank-up battery from the time obtained by the time measurement and addition means.

[For production]

According to the above configuration, since the backup battery exhibits different characteristics depending on the degree of power consumption in the circuit that supplies power, the characteristics obtained by measuring and adding the characteristics by the time measurement and addition means. By comparing the time, that is, the time during which the backup battery was actually supplying power, it is possible to estimate the state of consumption of the backup battery. In the consumption state estimation means, this estimation is performed based on, for example, data on the consumption state corresponding to the time when the backup battery has supplied power, which is set in advance.

In this way, from the total amount of time that the main power supply has stopped supplying power, that is, the total amount of time that the backup battery has been supplying power, it is possible to estimate the state of consumption of the backup battery according to the power supply time. .

In addition, the time measurement addition means can be replaced by a conventional timer driven by a backup battery, and the consumption state estimation means can be replaced by a CPU and memory, so a backup battery can be used instead. A dedicated circuit such as voltage measurement is no longer required to estimate the state of wear and tear.

〔Example〕

An embodiment of the present invention will be described below based on FIGS. 1 and 2.

As shown in FIG. 1, the device for estimating the consumption state of a flattened battery according to the present embodiment includes a time measurement and addition means 1, a consumption state estimation means 2, and a display device 3.

On the other hand, the DC power supply 4 provided in the main unit (not shown) is
It constitutes the main power supply that generates the DC voltage of 5■, and includes the display device 3, CPU 5, ROM 6, RAM 7, and timer 8.
is provided to supply power to the Of these, RA
M7 and timer 8 are supplied with power from DC power supply 4.
This is done through a diode D1 to prevent backflow of current. On the other hand, the backup battery 9 is a lithium battery, generates a DC voltage lower than that of the DC power supply 4, for example, 3cm, and is equipped with a resistor R for current limitation and a diode D2 for preventing current backflow. via R
It is provided to supply power to AM7 and timer 8.

The time measurement addition means 1 includes a CPU 5, a ROM 6, and a RAM 7.
and a timer 8.

The timer 8 has a clock function and outputs date and time data. The CPU 5 is a DC power supply 4
Check the date and time immediately before the timer 8 turns off.
In addition to reading the date data and storing it in the RAM 7, reading the date and time immediately after the DC power supply 4 is turned on in the same manner as above, and storing this date/time data and R
By performing arithmetic processing on the above date and time stored in AM7, the time when the DC power supply 4 was OFF,
In other words, the power supply stop time during which power supply was stopped is measured. Further, the CPU 5 stores the power supply stop time measured in this way in the RAM 7, and adds the power supply stop time measured later to this power supply stop time, thereby determining the total power supply stop time. It is designed to be calculated. Such processing by the CPU 5 is performed according to a program stored in the ROM 6.

The consumption state estimating means 2 is composed of a CPU 5 and a ROM 6. The CPU 5 estimates the state of consumption of the backup battery 9 from the power supply stop time of the DC power supply 4 obtained by the time measurement and addition means 1.

The backup battery 9 is used in a circuit that supplies power.
Since it exhibits different characteristics depending on the degree to which power is consumed,
By making this correspond to time and using it as data for estimating the state of consumption, and by comparing this data with the power supply stop time measured by the time measurement addition means 1, the state of consumption of the backup battery 9 can be estimated. . Therefore, the ROM 6 stores data on the state of consumption of the backup battery according to the power supply time. This data is obtained, for example, from the discharge characteristics and life characteristics of the backup battery 9, which are measured in advance, depending on the load to which the backup battery 9 supplies power.

Furthermore, as a result of estimating the state of consumption based on the above data, the CPU 5 determines the replacement time and remaining life of the backup battery 9 and notifies the operator via the display device 3. The processing of the CPU 5 as described above is
Similar to the time measurement and addition means 1, this is performed according to a program stored in the ROM 6.

The display device 3 displays the consumption state of the backup battery 9 estimated by the consumption state estimation means 2, and also displays the replacement time and remaining life.

In the above configuration, when the DC power supply 4 is ON, the display device 3, CPU 5, RO
Power is supplied to M6, RAM7 and timer 8. Since the voltage of the DC power supply 4 is higher than the voltage of the backup battery 9, at this time, the backup battery 9 does not supply power and no power is consumed.

When the DC type 'rA4 is turned off, the time measurement and addition means 1 calculates the date and time immediately before turning off as CPt.
, 15 from the timer 8 and stored in the RAM 7. When the DC type 'a4 is turned off, power is supplied from the backup battery 9, so the RAM 8 retains the above date and time data and the previously measured power supply stop time data, while the timer 8 retains the date and time data. Continue to send time data. At this time, the current flowing from the bank amplifier battery 9 is limited by the resistor R, so the display device 3,
The power supplied to the RAM 7 and the timer 8 is small, and the power consumption of the backup battery 9 is suppressed. Further, the current flowing through the diode D2 is blocked by the diode D and is not supplied to anything other than the RAM 7 and the timer 8.

When the DC power supply 4 is turned on again, the CPU 5 reads the date and time immediately after the power is turned on from the timer 8, and combines this date and time with the date and time stored in the RAM 7 immediately before the DC power supply 4 is turned off. The power supply outage time can be obtained from Then, if the power supply stop time has been previously determined and that data is stored in the RAM 7, this power supply stop time and the above power supply stop time are added to obtain the total power supply stop time. .

The CPU 5 calculates the power supply stop time obtained by the time measurement and addition means 1 as described above based on the data on the consumption state of the bank backup battery 9 stored in the ROM 6, that is, when the backup battery 9 is supplying power. The consumption state of the backup battery 9 corresponding to the time spent is estimated, and the replacement time and remaining life of the backup battery 9 are displayed on the display device 3 together with this consumption state.

Here, the processing procedure for estimating the consumption state of the backup battery 9 will be explained based on the flowchart of FIG. 2.

Currently, DC type WX4 is ON, and DC power supply 4 is ON.
It is determined whether the switch is switched to OFF from (S 1
), if it is determined not to switch, this determination is repeated until it is determined that it will switch, while if it is determined that it will switch, the date and time immediately before switching is read and stored as data A (S2). next,
It is determined whether the DC power supply 4 that is OFF will be switched ON (33), and if it is determined that it will not be switched,
This determination is repeated until it is determined that there is a switch, and when it is determined that there is a switch, the date and time immediately after the switch is read as data B (S4).

Subsequently, the data A is called and data A is subtracted from data B to obtain data C and the power supply stop time (S5). Then, the above data C is added to the previously obtained and stored data D representing the total power supply stop time, and new data D
is obtained (S6). The consumption state of the backup battery 9 is estimated from the data D obtained as described above (S7). Thereafter, the processes from 81 to S7 are repeated in the same manner, and the exhaustion state of the backup battery 9 is estimated one by one.

[Effect of the invention] The backup battery consumption state estimating device according to the present invention has the following features:
As described above, in an auxiliary power supply device equipped with a backup battery that supplies power while the main power supply stops supplying power, the time during which the main power supply stops supplying power is measured, and This configuration includes a time measurement addition means for adding time, and a consumption state estimation means for estimating the consumption state of the backup battery from the time obtained by the time measurement addition means.

As a result, the depletion state of the backup battery can be estimated from the time when the main power supply stops supplying power, that is, the time when the backup battery is supplying power, so it is possible to know the depletion state of the backup battery one by one. Backup batteries can be replaced at appropriate times.

In addition, the time measurement addition means and the consumption state estimating means can be replaced with conventionally provided timers, CPUs, and memories. This has the effect of eliminating circuitry.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a block diagram showing the configuration of a backup battery consumption state estimating device. FIG. 2 is a flowchart showing the processing procedure for estimating the state of consumption B of the backup battery. 2 is a time measurement addition means, 2 is a consumption state estimation means, 4 is a DC power source (main power source), and 9 is a backup battery. Figure 2

Claims (1)

[Claims] 1. In an auxiliary power supply device equipped with a backup battery that supplies power while the main power supply stops supplying power, measure the time that the main power supply stops supplying power, and add the measured time. What is claimed is: 1. A backup battery consumption state estimating device comprising: a time measurement and addition means for estimating the consumption state of the backup battery from the time obtained by the time measurement and addition means;