JPS61132044A - Memory backup unit - 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 [Field of Industrial Application] The present invention relates to a memory backup device, and particularly to data protection thereof during a power outage.

[Conventional technology]

Figure 3 shows, for example, a conventional memory backup method for protecting the contents of a memory system using volatile memory as shown in the General Battery Catalog (published by Matsushita Battery Industries, November 21, 1981). This is a configuration diagram of the device, in which 1 is the main power supply, 2 and 2' are the first and second matching circuits of the main power supply and battery composed of diodes, 3 is the backup battery, and 4 is the memory using volatile memory. It is a system.

Next, the operation will be explained. Backup battery 3
is used as a backup power source when the main power supply 1 is cut off, so
The voltage of the main power supply 1 is set higher than the voltage of the backup battery 3, and the memory system 4 is normally supplied with power from the main power supply 1, and the current from the main power supply 1 is
It is cut off by the second matching circuit 2, and the backup battery 3 is protected from charging. When the main power supply 1 is cut off, the voltage of the backup battery 3 is higher than the voltage of the main power supply 1, so the current of the backup battery 3 is prevented from flowing to other than the memory system 4 by the first matching circuit 2. This prevents loss of capacity of the backup battery 3.

[Problem that the invention seeks to solve]

Since conventional memory backup devices are configured as described above, the backup battery supplies power after the main power is cut off, so the time limit due to the capacity of this battery becomes a problem. , 1 main power outage”
There were problems such as the need to know the elapsed time.

This invention was made in order to solve the above-mentioned problems.It outputs a "disconnection" detection signal from the main power supply, and uses this to turn off a power supply separate from the main power supply only when the backup battery is activated. The purpose of this invention is to provide a memory backup device that can quantitatively manage time by counting an integrating time meter driven by.

[Means for solving problems]

The memory backup device according to the present invention includes an input from a detection contact that outputs to the main power source that the power is “off”;
1st. It is equipped with a detection circuit that detects the voltage of the backup battery from the second matching circuit, and manages the time of the backup battery using an integrating time meter that receives a count input command from the detection circuit and displays the count value. This is what I did.

[Effect]

In the memory backup device according to the present invention, a detection circuit detects a "cutoff" of the main power supply, and based on the detection result, the cumulative time, which is the consumption time of the backup battery, can be displayed on the cumulative time meter.

[Emission ÷ 4 Examples] An embodiment of the present invention will be described below with reference to FIG.

In Figure 1, 2.7 is the first diode.
．． a second matching circuit; 3, a backup battery such as a lithium battery; 4, a memory system using volatile materials; 5, an integrated hour meter that is driven by an individual battery and has a reset function and can display a count value; 6 is a main power supply with a detection contact when the main power is "off", 10 is a detection circuit operated by a backup battery, 6A is the main power supply self-selection, a detection contact for detecting a power outage, 2a is the 1st ゜□ Second matching circuit 2. Voltage after butting and matching of τ, 5a.

5b is an input to the integrating time meter 5. Fig. 2 is an internal block diagram of the detection circuit 10 operated by a backup battery, and in Fig. 1.5, 7 is a voltage comparator;
8 is a NAND or AND logic circuit, and 9 is an open collector output logic.

Next busy action will be explained. . When the main power supply 6 is disconnected, the backup battery 3 supplies energy to the memory system 4, which is the load, as a backup power source.At this time, the main power supply 6 is disconnected by the detection contact 6a of the main power supply 6.
The detection output 1 is inputted to the logic circuit 8 as the logic circuit 8, and the gate is opened.

This results in 1, C at the voltage comparator 70 input.
If the voltage of 2a] > OV, it comes out, passes through Calogic 9,
Integrating time meter 5 with built-in individual battery via inputs 5a and 5b
Input a count input command to make it count. Therefore, the capacity of the backup battery 3 is now X (Ah), and the memory system 4, which is the load, is KY (m
If a current of A) is required, the battery life T (h)
becomes T=10 standing JL (h).

In other words, when the count value displayed on the cumulative time meter 5 reaches T, the backup battery 3 can be replaced.

Also, after replacing the backup battery 3, the total time meter 5
If you reset and keep it, you will be able to manage your time over and over again.

In the above embodiment, the second butting circuit 2' has one diode and one backup battery 3, but a plurality of diodes may be provided. Further, although the example in which diodes are used as the 1.1 and second matching circuits 2.2' is shown, a transformer, a transistor, etc. may also be used. -Furthermore, although the integrating time meter 5 has a built-in separate battery and a built-in battery, it may be driven by a power source other than the main power source5.Additionally, an alarm contact may be output when the target count is reached. 4 [Effects of the Invention] As described above, according to the present invention, the detection circuit operated by a power source other than the main power source detects the disconnection of the main power source and the voltage of the backup battery at that time is higher than a predetermined value. Since the system is configured to count the time with an integrated time meter and recognize that the life time of the backup battery has elapsed, it has the effect of quantitatively managing the time to replace the backup battery.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is a detailed block diagram of the main parts of the figure, and is a configuration diagram showing a conventional battery backup device. In the figure, 2.2' is the 1st. A second matching circuit, 3 a backup battery, 4 a memory system, 5 an integrated hour meter, 6 a main power source, 6 detection contacts, and 10 a detection circuit. In each figure, the same reference numerals indicate the same or equivalent parts. Figure 1 6A: Ten button appearance■, Figure 2 Procedural amendment (voluntary)

Claims (1)

[Claims] A main power supply that supplies power to the memory system and outputs a detection contact when the power supply is cut off, and a backup battery that supplies power when the main power supply is cut off so as to back up the power supply of the memory system. , first and second matching circuits that can switch between the main power source and the backup power source when the power is turned off; and a count input by receiving the contact output of the main power source and the output voltage of the first and second matching circuits. a detection circuit that outputs a command;
A memory backup device equipped with an integrating time meter that displays a count value based on a count input command from this detection circuit.