JPS609861Y2 - Storage device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a storage device that reliably notifies the user of the occurrence of an unstable period in which the voltage of a backup power supply for volatile memory has fallen below a specified value. .

In recent years, with the rapid development of electronic technology, various storage devices have been used.

In this case, storage devices can be roughly divided into non-volatile memories, such as ROM, whose stored contents do not change even when the power is turned off;
It is classified as volatile memory, such as RAM, whose stored contents disappear when the power is turned off.

RAM, which is a volatile memory, is used in various devices because data can be written and read easily.

In this case, a data terminal device using volatile memory is equipped with a DC battery as a backup power source, in addition to a commercial power source as a driving power source, especially for retaining the contents of the volatile memory.

A DC battery serving as a backup power source is charged when commercial power is supplied, and when the commercial power is cut off, it continues to supply power for retaining stored contents only to the volatile memory.

However, in the above-mentioned bark storage device, if the commercial power supply is cut off for a long period of time, the voltage of the DC battery serving as a backup power source will also drop and the contents of the volatile memory will be erased.

On the other hand, if the commercial power is then restored (ON) and an automatic dialing device, for example, in which the memory device is built-in, is activated, the contents of the volatile memory have been destroyed, resulting in erroneous calls or connections. I'll do it.

To solve this problem, a voltage detection circuit is installed to detect when the voltage of a DC battery as a backup power source has fallen below a specified value, and the detection output of the voltage detection circuit drives an alarm generating device. Accordingly, a system has been proposed that is configured to notify that the content retention capacity of volatile memory is approaching its limit.

However, in the device with the above configuration, the alarm generating device operates using the DC battery as a backup power source, so if the operator is absent, the alarm generating device continues to operate and the DC battery is completely depleted. The drawback was that it disappeared.

Additionally, when the output of the DC battery is cut off, the alarm from the alarm generator also disappears, and the operator who returns in this state may perform operations without realizing that the contents of the volatile memory have been destroyed. This method has the disadvantage of causing erroneous calls and connections.

In view of the above points, the present invention has been devised to solve these problems and eliminate such drawbacks. It is an object of the present invention to provide a storage device that can prevent malfunction of the device according to the stored contents by storing the information using a mechanical or magnetic latch means.

To achieve this goal, the present invention has developed a volatile memory, a DC power supply that is normally charged by the main power supply and that backs up the volatile memory and retains its stored contents even after the main power is turned off, and this DC power supply. In a storage device equipped with a voltage detection circuit that detects that the voltage of the voltage has decreased below a predetermined value, and an alarm device that issues an alarm based on the detection output of this voltage detection circuit, the detection output of the voltage detection circuit is mechanically or A latching device that magnetically stores and self-holds the alarm operating state of the alarm device; and a reset circuit that resets the latching device by at least one of a write end signal to the volatile memory and a reset switch output. It was designed to be provided.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing an embodiment of a storage device according to the present invention, and shows an example in which the present invention is applied to an automatic dialing device.

In the figure, 1 is a DC power supply circuit that converts commercial power supplied via a plug 2 into, for example, 24V DC power; 3
5 is a power switch that supplies the output of the DC power supply circuit 1 to the control circuit 4, and 5 is a volatile memory whose power source is the output of the DC power supply circuit 1. This volatile memory 5 is connected to a desired destination by a thread (not shown). It is configured such that data corresponding to a telephone number is stored, and data corresponding to a telephone number of the other party specified by the control circuit 4 is read out.

6 charges the output of the DC power supply circuit 1;
7 is a battery that supplies power to the volatile memory 5 and the voltage detection circuit 7, latching relay 8, and alarm circuit 9 which will be described later. 6 is a voltage detection circuit that detects that the output voltage has fallen below a specified value; 8 is a latching relay that is set by the output of voltage detection circuit 7 and held mechanically or magnetically; 9 is latching relay 8
An alarm circuit is activated by the output of the DC power supply circuit 1 or the output of the battery 6 when the contact 8a is closed, and 10 is an OR gate which receives the write end signal A for the volatile memory 5 and the reset switch output B; The latching relay 8 is reset by the output of 10.

Reference numeral 11 denotes a dialing circuit for transmitting a dialing signal to the office line in response to the output of the control circuit 4.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

First, when plug 2 is inserted into a commercial power outlet,
A DC output of a predetermined value is generated from the DC power supply circuit 1.

This DC output is supplied to the volatile memory 5 to keep it operational and to charge the battery 6.

Next, when the power switch 3 is turned on, power is supplied to the control circuit 4 and the automatic dialing device becomes operational.

In this state, after writing data such as the telephone number of the center side into the volatile memory 5, when a destination is specified using a selection button (not shown), the destination signal E is supplied to the control circuit 4.

The control circuit 4 reads the volatile memory 5 in response to the destination signal E, and transmits the read data to the dial transmission circuit 11.
supply to.

The dialing circuit 11 performs automatic dialing by transmitting a dialing signal corresponding to data supplied from the control circuit 4 via the central office line.

Next, when the commercial power supply is cut off for some reason, the output of the DC power supply circuit 1 is also cut off accordingly.

When the output of the DC power supply circuit 1 is cut off, the output of the battery 6 is supplied to the volatile memory 5 and its contents continue to be held.

Then, the output voltage of the battery 6 is a predetermined value,
That is, when the retention limit voltage of the volatile memory 5 is reached, the voltage detection circuit 7 is activated and the latching relay 8 is set.

In this case, if the latching relay 8 has a two-winding configuration, the current will flow through the set winding, and if the latching relay 8 has a one-winding configuration, the current will flow in the set direction.

Then, when the latching 8 is set, its contact 8a
is closed, and accordingly, the alarm circuit 9 closes the battery 6.
The output of the battery 6 is activated to perform an alarm operation.
When the output is cut off, the alarm operation is also stopped.

However, since the latching relay 8 is configured to continue to maintain its operating state mechanically or magnetically, the latching relay 8 is configured to continue to maintain its operating state mechanically or magnetically. An alarm circuit 9 is activated by the output of the DC power supply circuit 1, thereby notifying that the contents of the volatile memory 5 have been destroyed.

Therefore, the operator can use this notification to
Since normal operations are performed after data is rewritten to, accidents such as erroneous transmissions and erroneous connections, which are conventional, are reliably prevented.

FIG. 2 is a side view showing an embodiment in which the latching relay itself is provided with an alarm function, and one end of the first yoke 15 is attached to one end of the electromagnet constituted by the magnetic core 12, the core 13, and the coil 14. It is fixed, and the other end is bent into a substantially U-shape and is close to the other end of the electromagnet.

Further, a second yoke 22 is fixed to the fixed end side of the first yoke 15 of the electromagnet via a permanent magnet 16, and the other end is bent into an L shape and is close to the other end side of the electromagnet. .

A shaft 17 is provided in a part of the second yoke 17, and an armature 18 is rotatably supported around the shaft 17, and these constitute a single-winding latching relay. There is.

In this case, unlike a normal latching relay, the rear end portion of the armature 18 relative to the fulcrum is extended by an arm 19, and a display piece 20 is provided at the tip thereof.

A display window 21 is provided in the casing of the main body of the apparatus, which faces the display piece 20 when the latching relay is in operation.

Therefore, the latching relay with the alarm function configured in this way is suitable for the amateur 1 located in the state shown by the dotted line.
8, the arm 19 and the display piece 20 are held in the position shown by the solid line by a latching operation, so that the display window 21
The display strip 20 containing the message ``1 Automatic dialing not possible'' will be displayed to issue a warning.

As explained above, the present invention provides a latching device that mechanically or magnetically stores the detection output of a voltage detection circuit to self-maintain the alarm operating state of an alarm device, and a latching device that stores the detection output of a voltage detection circuit in a volatile memory. The device is provided with a reset circuit that is reset by at least one of the write end signal and the output of the reset switch, and is configured to continue generating an alarm condition in accordance with the operation of the latching device. Since the system always issues a warning, it is possible to prevent malfunctions of the device, so the practical effect is extremely large.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a main part showing an embodiment in which a storage device according to the present invention is applied to an automatic dialing device, and FIG. 2 is a side view showing an embodiment of a latching relay having an alarm function. 1...DC power supply circuit, 5...Volatile memory, 6...Battery, 7...Voltage detection circuit, 8...Latching Relay 9...
...Alarm circuit.

Claims (1)

[Scope of utility model registration request] A volatile memory, a DC power supply that is normally charged by the main power supply and backs up the volatile memory and retains the stored contents even after the main power supply is turned off, and detects when the voltage of the DC power supply drops below a predetermined value. In a storage device comprising a voltage detection circuit and an alarm device that issues an alarm based on the detection output of the voltage detection circuit, the detection output of the voltage detection circuit is mechanically or magnetically stored to determine the alarm operating state of the alarm device. 1. A storage device comprising: a latching device that self-holds the latching device; and a reset circuit that resets the latching device by at least one of a write end signal to the volatile memory and a reset switch output.