JPH01274324A - Control device for relay - Google Patents

Abstract

PURPOSE:To make it possible to conduct opening/closing action of a relay contact at the specific voltage phase of the AC power source by conducting the drive and detection of the relay contact with synchronizing to the timing of the input of other load, etc. CONSTITUTION:An AC power source 4 is electrified to a load 3 via a relay contact 5. After an open/close action signal is outputted from the output port P31 of the microcomputer 12 conducting a time division control to a relay contact drive means 6, the time, in which the condition of a relay contact is detected with an input port P21, is detected via an action time measurement means 8. Based on the time, correction is made so that the action of the contact 5 at the time of opening/closing can be made at the specific voltage phase of the source 4 via a relay contact correction means 9. The detection of the action of the contact 5 is made at the timing to avoid the time when the data other than a relay contact is inputted in the microcomputer 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a relay that controls the supply of AC power to a heater or the like.

Conventional technology Conventionally, this relay control method was used for the entire system.

When the body controls LEDs and other loads in addition to relay control, it is difficult to independently detect the relay operating time while ignoring other input/output and sequences other than relay control. It has been difficult to properly incorporate a function that feeds back the operating phase point of the relay contact to the power supply according to the operating time of the relay.

Problems to be Solved by the Invention With such a conventional configuration, it is impossible to control the opening and closing operations of the relay contacts with respect to a specific voltage phase of the AC power supply, and it is possible to extend the life of the relay contacts by protecting them. There were issues that made it difficult to do so.

The present invention is intended to solve the above-mentioned problems.In a system that performs input/output control of loads other than relay control, it is possible to simultaneously measure the operating time of relay contacts, and to change the opening/closing operation of relay contacts to alternating current. The purpose of this is to provide a function that allows feedback control for a specific voltage phase of the power supply.・Means for Solving the Problems In order to achieve the above object, the present invention causes relay contacts to be driven and detected in synchronization with the timing of load output and switch input other than relay contact control. This is how it was done.

Function: With this configuration, in a system that controls multiple input/output loads, it is possible to measure the relay operating time at the same time as other input/output controls, and it is possible to perform ideal control of relay contacts. It is.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. 1 is a measuring means that constantly counts the elapsed time, and 2 is a signal outputting means that outputs a signal when the elapsed time of the measuring means 1 exceeds a certain time. 3 is a load to which AC power supply 4 is energized via relay contact 6 . Here, the relay contact is driven by a relay contact driving means, and the relay contact detection means 7 determines whether the relay contact is open or closed. In addition, the operating time from when the relay contact is driven to when the open/close state of the relay contact changes is measured by an operating time measuring means 8, and e is based on the operating time measured by the operating time measuring means. , is a relay contact correction means for feeding back the operating point of the relay contact so that it is performed at a specific phase of the AC power source 4. 1° is a synchronization means for controlling the driving, sensing and operating time of the relay contacts.

FIG. 2 is a circuit diagram showing a specific configuration of the present invention.

11 is the output port PO1 to PO3 and the input port (Po1)
A matrix is shown that controls the input/output loads of A1 to AI2 by combinations of ~PO3. P21 is an input port for detecting the open/closed state of the relay contact 6. P31 is an output port for driving a relay contact.

12 is a microcomputer that operates the entire system including control of each input/output.

The operation of the relay control device in this embodiment configured as described above will be described below.

In order to control the inputs and outputs A1 to A12 of each matrix, control is achieved by combining the outputs of the output ports Po1 to PO3 and the inputs and outputs of the input ports P11 to P14. Specifically, for example, when operating the load A1, it is sufficient to operate Po1 and Pll at the same time. By the way, the outputs A1 to A12 of each matrix are as follows: Pll-;P14O for Pol to PO3
Since it is controlled in order by the output, Po1 to PO3
If only a specific terminal among the matrix outputs A1 to AI2 can be driven, only the load connected to the specific terminal among Po1 to PO3 among the matrix outputs A1 to AI2 can be controlled, and all loads cannot be controlled. .

In order to avoid such inconvenience, it is necessary that Po1 to PO3 are always output in sequence at a constant cycle.

On the other hand, as for the control method of the relay, it is desirable to control the relay so that the opening/closing operation is performed at a specific voltage phase of the AC power supply in order to prevent deterioration of the relay contacts. After the relay contact opening/closing signal is output from P21, the operating time is measured until the input capo P21 detects that the relay contact has actually been opened/closed, and this value is used to drive the next relay contact. Feedback is required during output. There are several ways to measure the time it takes for the relay contacts to actually operate after the relay contacts are driven, but if you have a timer dedicated to measuring the operating time separately from the microcontroller 12, However, it is often difficult to use a dedicated timer due to reasons such as the need to reduce costs, and it becomes necessary for the microcomputer 12 itself to have the timer function. At this time, when the microcomputer 12 is made to operate the timer function, depending on the performance of the microcomputer, it is often possible to perform only the timer function, and in that case, the matrix outputs A1 to A12 may be It becomes impossible to perform output control, etc.

Therefore, as shown in Figure 3, if the AC power source is a,
By driving the relay contacts and detecting the open/closed states in accordance with the time-divided timings b-d of outputting the matrix outputs A1 to A12, it is possible to provide a timer function at the same time.

Specifically, the rising point 13 of time-dividing the relay contact
When the relay contacts are driven in accordance with the timing of , the actual operation of the relay contact is detected in accordance with the rising 9 points of each division point. At this time, the accuracy of detecting the operating time of the relay is at the level of dividing the AC power supply 4 into three.

As a method of increasing this detection accuracy, the number of divisions may be doubled, for example, and the operation or detection may be performed at the rising edge of each division point, as shown in e of FIG. At this time, the outputs of matrix outputs A1 to A12 are divided into two by processing them as the division width of one matrix, thereby improving the accuracy of measuring the operating time of the relay contacts while simultaneously performing time-sharing control of input and output of the matrix. It is also possible to do so.

Further, when inputting the open/closed state of the relay contact at the rising time of each time division, it is necessary to perform more stable detection in order to make it resistant to noise and the like.

Therefore, as shown in Fig. 4, except for the time for processing input/output of ma)+1x other than relays at each time division point a (the shaded area in Fig. 4), the relay contacts are To constantly detect information and to be able to detect changes in the open/closed state of relay contacts multiple times. Then, the operating time of the relay is determined by determining between which time division points the time when the open/closed state is thought to have changed occurred.

Effects of the Invention As is clear from the above embodiments, according to the present invention, if the relays are operated synchronously during periods when various control processes are not performed, a detection signal can be captured, and therefore the operation time of the relay contacts can be measured. In microcomputer control that performs time-sharing control, it is possible to open and close the relay contacts at a specific voltage phase of the AC power supply, and prevent deterioration of the relay contacts due to the opening and closing operations of the relay contacts. , it is possible to obtain the effect that the life can be extended.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a relay control device showing an embodiment of the present invention, FIG. 2 is a circuit diagram thereof, and FIGS. 3 and 4 are timing charts showing simultaneous division. 1... Measuring means, 2... Signal output means, 3... Load, 4... AC power supply, 6...
...Relay contact, e...Relay contact driving means, 7...Relay contact detection means, 8...
. . . Operating time measuring means, 9 . . . Relay contact correction means, 10 . . . Synchronizing means. Name of agent: Benrishi Toshio Nakao and 1 other person 1st
Figure 2 Figure 3 (d) Figure 4 Nifu (b)

Claims (1)

[Claims] A measuring means for measuring elapsed time, a signal outputting means for outputting a signal when the measuring means measures a certain period of time, a relay contact for controlling the supply of AC power to the load, and a relay for driving the relay contact. a contact drive means, a relay contact detection means for detecting the open/close state of the relay contact, an operation time measurement means for measuring the operation time for opening and closing the relay contact; a relay contact correction means for realizing an operating point of at a specific voltage phase of an AC power supply; and a relay contact drive means, a relay contact detection means, and an operation time measurement means in synchronization with the output of the signal output means. Relay control device with synchronization means.