JPH1179567A - Power failure time detecting device for hydraulic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the capacity of a backup power supply by holding a power failure state when the power failure period longer than a specified period and compensating the sink quantity of an elevator cage based on a signal indicating whether the power failure continued for the specified time or longer when a power source is restored. SOLUTION: A power failure detection circuit 1 outputs a '1' level while power is supplied and output '0' level during power failure. A specified period counting circuit 2 starts counting as soon as detecting power failure by receiving an S1 signal and outputs '0' level while power is supplied and outputs '1' level after the lapse of the specified period. This result is input in a count result holding circuit 4 through a buffer 3. After that, even if the power from a backup power is cut off, for example, the count result holding circuit 4 holds '1' level. In the next step, an output circuit 5 outputs '1' level while power is being supplied, '1' level before the lapse of the specified time after the start of power failure and '0' level after the lapse of the specified period taking NOR of the power failure detection circuit 1 and the count result holding circuit 4. Even if a battery is dead due to long power failure, a count result can be held when power is restored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a means for maintaining a power failure state when a power failure has elapsed for a predetermined time or more, and for outputting whether or not the power failure time is longer than a predetermined time when the power is restored. The present invention relates to a power outage time detection device for a hydraulic elevator that generates a correction operation signal that corrects a subsidence of an elevator car based on an output signal.

[0002]

2. Description of the Related Art In a conventional power failure time detection circuit, a backup power supply is used as a power supply at the time of a power failure. However, means for counting elapsed time of a power failure and output means always consume load current even during a power failure.

Therefore, when a power failure occurs for a long period of time, a large-capacity backup power supply is required to hold an output signal that has detected the power failure state until power recovery.

[0004] Further, the backup power supply for backup has a relatively short life of 4 to 8 years. Therefore, when the backup power supply is used for about 20 years like an elevator, it takes 3 to 4 years.
The backup power supply has to be replaced ~ 5 times,
There was a problem that was a major obstacle to maintenance.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to enable a power supply having a relatively small capacity to hold an output signal in a power failure state when a power failure occurs,
Another object of the present invention is to provide a power outage time detecting device including a long-life backup power supply.

[0006]

In order to achieve the above object, the present invention provides means for detecting a power failure and counting a predetermined time after the power failure, and holding the counting result until the power is restored. A means for continuing and a means for outputting whether or not the power outage time is equal to or longer than a predetermined time at the time of power recovery based on an output signal from the means for maintaining the count result until power recovery is achieved. Even if the backup power supply is cut off during a power failure by using a backup power supply having a capacity, a signal can be held by means for maintaining the count result until the power is restored.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 1 is a block diagram of an apparatus for detecting a power failure time of a hydraulic elevator according to one embodiment of the present invention. FIG.
1 is a power failure detection circuit that detects the occurrence of a power failure,
Reference numeral 2 denotes a predetermined time counting circuit for counting a power failure time when a power failure occurs. Reference numeral 3 denotes a buffer circuit for allowing the two outputs to be taken into the count result holding circuit 4, and 4 denotes the
A counting result holding circuit that has a function of holding the counting result of the above 2 and that does not require a power supply during holding, such as a latching type output means. Reference numeral 5 denotes an output circuit which receives the first power failure detection signal and the fourth output signal and outputs whether or not the power failure time is equal to or longer than a predetermined time at the time of power recovery.

FIG. 2 is a time chart for explaining the operation of the embodiment shown in FIG. As shown in FIG. 2, S1 indicates an output signal of the power failure detection circuit 1, which is a "1" level at the time of power purchase, but becomes a "0" level when a power failure occurs. S2 indicates an output signal of the predetermined time counting circuit 2, which is "0" level at the time of power purchase.
This signal is a signal that starts counting the power failure time as soon as 1 goes to the “0” level, and rises from the “0” level to the “1” level when the predetermined time T1 has elapsed.

S3 indicates an output of the counting result holding circuit 4, which is a signal which is at "0" level at the time of power purchase but becomes "1" level at the rise of S2 as in S2, and S4 is The output of the output circuit 5 is a signal which is at "0" level at the time of power purchase, becomes "1" level at the time of power failure occurrence, and becomes "0" level after a lapse of a predetermined time T1.

The operation will be described with reference to FIGS. 1 and 2. The output of the power failure detection circuit 1 is at the "1" level at the time of power purchase, but is at the "0" level when a power failure occurs. Next, the power failure predetermined time counting circuit 2 counts immediately after the detection of the power failure upon receiving the signal of S1, but it is at the “0” level within the predetermined time T1, and thereafter, when the predetermined time T1 elapses, the predetermined time counting is performed. The output of the circuit 2 rises to "1". The result is input to the counting result holding circuit 4 via the buffer 3, and thereafter, the counting result holding circuit 4 keeps "1" even if the backup power is turned off.

Next, since the output circuit 5 is a circuit that performs a logical OR operation of the power failure detection circuit 1 and the count result holding circuit 4 and outputs the result, the level is "0" at the time of power purchase and a predetermined time T after the power failure occurs.
The level within "1" becomes "1" level, and becomes "0" level after a lapse of a predetermined time T1. Further, even if the power failure time is as long as the battery runs out, the counting result holding circuit 4 outputs the “1” level at the time of power recovery, so that the output circuit 5
Can output “0”.

As described above, the counting result holding circuit 4 utilizing the latching type output means allows the predetermined time T1
It is not necessary to perform backup until power is restored as long as power is restored, so that a power failure time detection device for a hydraulic elevator with a reduced backup power supply can be provided.

[0014]

According to the present invention, by using the latching type output means for the predetermined time counting circuit, power is restored only by backing up only a very short predetermined time for operating the predetermined time counting circuit. Since there is no need to back up the remaining long time until then, there is an effect that a relatively small-capacity backup power supply can be employed.

[Brief description of the drawings]

FIG. 1 is a block diagram of an elevator power outage time detecting device according to an embodiment of the present invention.

FIG. 2 is a time chart of a block diagram of an elevator power outage time detection circuit shown in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power failure detection circuit, 2 ... predetermined time counting circuit, 3 ... buffer circuit, 4 ... counting result holding circuit, 5 ... output circuit.

Claims (1)

[Claims] 1. A means for detecting a power failure and counting a predetermined time after the power failure, a means for outputting that a predetermined time has elapsed as a result of counting the time by the counting means, and a power failure time exceeding a predetermined time In this case, based on the output signal from the predetermined time lapse output means, when the power is restored, the elevator provided with the settlement correction means for outputting a correction operation signal for correcting the settlement of the car of the hydraulic elevator, and Means for holding the count result output from the time counting means until power is restored, and when the power is restored after a power failure occurs, an output signal from the means for holding the count result until the power is restored. A means for outputting whether or not a power outage time is equal to or longer than a predetermined time when the power is restored, based on the power outage time detection device.