JPH0281202A - Load control apparatus - 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 the Invention The present invention relates to a load control device that controls a load via a self-holding relay.

Conventional technology Relays are often used to switch on and off the load power supply in load control devices that control various loads mainly by remote control. Holding type relays are often used.

Conventionally, a load control device using this type of self-holding relay has a structure as shown in FIG.

In other words, the input means 2 of the load control device 1 is controlled by the control means 3.
When a signal for turning the load 4 ON or OFF is input to the self-holding relay 5, the control means 3 causes the self-holding relay 5 to
Outputs a drive signal with a certain length of time t as shown in the figure,
Turn load 4 ON or OFF. In addition, load control equipment 1
And the load control device 4 is supplied with electric power from the commercial power source 6. When there is no input from the input means 2, the control means 3 does not output anything to the self-holding relay 5.

In load control equipment using this type of self-holding relay,
It was designed to maintain a constant open/close state if there was no input, and the ON/OFF state of the load would not change even if there was a power outage.

Problem to be Solved by the Invention However, in such a load control device, when an external shock or vibration is applied, the contacts of the self-holding relay 5 mechanically move and change the open/close state. This phenomenon occurs, and there is a problem that the ON/OFF state of the load 4 changes.

In particular, if this phenomenon occurs during a power outage, there is no way to know that the load has changed, and the load state is reversed before and after the power outage regardless of the user's will, which is a low reliability problem. In the case of equipment and thermoelectric appliances, this can lead to dangerous conditions.

The present invention aims to solve these problems and realize a highly reliable load control device that can maintain the same load state before and after a power outage even if a self-holding relay reverses during a power outage. .

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention connects a storage means to the control means, and stores and stores open or closed output signal data outputted by the control means to the self-holding relay. .

Furthermore, at the time of startup after the power outage is restored, the control means reads the output signal data from the storage means and sends the same output to the self-holding relay as the last output before the power outage.

Further, a power outage detection means is connected to the control means, and the control means is configured to notify the control means of the occurrence of a power outage.

Effect: With the above-described configuration, in the load control device of the present invention, when the power is restored, the control means outputs the same open or close signal to the self-holding relay as the last signal sent before the power outage.
Even if a self-holding relay is reversed during a power outage, it is possible to realize a highly reliable load control device that can always return to the original load state when the power is restored.

Further, by writing to the storage means only when a power outage is detected, the life of the storage means is prevented from being shortened.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

In FIG. 1, 9 is a load control device, control means 10,
It has a self-holding relay 12, storage means 13, 0N-OFF display means 14, and power failure detection means 17. The control means 10 is connected to an input means 11 consisting of a pushbutton, a voice recognition device, a receiving circuit, etc., a self-holding relay 12, a memory means 13. A load 15 is connected to. The load control device 9 and the load 15 receive power from a commercial power source 16.

In normal use, the load 15 should be turned on or off from the input means 11 from outside (when there is an input,
The input means 11 sends a signal to the control means 10, and upon receiving the signal, the control means 10 outputs an open or close output signal to the self-holding relay 12 to turn the load 15 on or off.
let Further, the control means 10 causes the storage means 13 to store and hold the open or closed output signal data, and outputs a display output corresponding to the open or closed output signal data to the ON/OFF display means 14, load 15 0
Display the N-OFF state using a lamp or the like.

When there is no input to the input means 11, the control means 10 does not output anything to the self-holding relay 12;
Or it remains OFF.

When a power outage occurs in the commercial power supply 16 and the load control device 9 resumes operation after power is restored, the control means 10 first reads out the output signal data for the self-holding relay 12 from the storage means 13 before the power outage. Then, the open or close output signal is directly output to the self-holding relay 12.

In the above embodiment, the control means 10 outputs the data to the storage means 13 every time there is an input to the input means 11, and stores the output signal data to the self-holding relay 12. Electrically erasable memory (E
When an EPROM (EPROM) is used, there is a limit to the number of times data can be written, so if the data is written to the self-holding type relay 12 every time the output signal data is output, the life of the self-holding relay 12 will be significantly shortened. Also, it takes a long time to write.

Therefore, the power failure detection means 17 is connected to the control means 10 and the commercial power supply 16 as shown in FIG.
7 detects a voltage drop in the commercial power supply 16 and outputs a signal indicating the occurrence of a power outage to the control means 10, the control means 10 causes the storage means 13 to store the output signal data previously output to the self-holding relay 12. The number of times of writing to the storage means 13 is greatly reduced.

Effects of the Invention As described above, the present invention sends the same output as the last output before the power outage to the self-holding relay when starting up after a power outage, so that it is not affected by shocks or vibrations during the power outage. Even if the contacts of the self-holding relay are reversed, the ON and OFF states of the load can always be the same before and after a power outage, resulting in high reliability of load control. Further, the user does not have to perform another operation to return the load to its original state after the power is restored.

Furthermore, if there is an ON-OFF display means, it is possible to prevent the display from being inconsistent with the ON-OFF state of the load when the power is restored.

Furthermore, by storing signal data in the storage means only when a power outage is detected, reliability can be ensured over a long life.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a load control device that is an embodiment of the present invention, Fig. 2 is a block diagram showing a conventional load control device, and Fig. 3 is an output signal waveform from the control means to the self-holding relay. FIG. 8... Load control device, 9... Control means, 11...
Self-holding relay, 12... Memory means, 17... Power failure detection means.

Claims (2)

[Claims] (1) a self-holding relay that controls a load; a control means that outputs a drive signal for opening/closing operation to the self-holding relay; and a control means that is connected to the control means and outputs a drive signal to the self-holding relay. storage means for storing output signal data, and the control means inputs the output signal data stored before the power outage from the storage means at the time of startup after the power outage is restored, and outputs the output signal to the self-holding type relay. Perform load control equipment. (2) The load control device according to claim 1, further comprising power failure detection means connected to the control means, and storing and retaining output signal data output to the self-holding relay only when power failure is detected.