JPH0227626A - Electromagnetic switch control device - Google Patents

Abstract

PURPOSE:To reduce dislocation and welding phenomena of a contact and improve the reliability by shifting the timing of ON, OFF operation of a plurality of electromagnetic switches for effecting ON, OFF operating of a load group and ON, OFF operation of the individual loads in said load group. CONSTITUTION:If the signals from operation start signal input means 11 and electromagnetic switch ON-OFF instructing means 13 are such that they are to effect ON or OFF operation of both of a first electromagnetic switch 6 and a second electromagnetic switch within a preset time, electromagnetic switch ON-OFF timing discriminating means 14 instructs the ON and OFF operation of the electromagnetic switches 6, 7 so as to shift the timing, and electromagnetic switch drive means 15 effects the ON and OFF operation of each electromagnetic switch 6, 7 response to the control signal from the electromagnetic switch ON-OFF timing discriminating means 14. Accordingly, the ON and OFF timing of each electromagnetic switch 6, 7 can be shifted. Thus, dislocation and welding phenomena of a contact are reduced and the reliability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a control device for a plurality of electromagnetic switches that turn on and off a power source and a load.

Conventional technology Generally, a load group driven by a power supply is provided, and the load group is turned on.
and to turn off the individual loads in that load group.
In a device that uses a plurality of electromagnetic switches to turn on and off, as shown in FIG. 33n and the electromagnetic switch 36 for supplying power to the load group 38, each load 3 of the load group 31
Electromagnetic switches 37 to 37n, electromagnetic switches 36 and 37m for turning ON and OFF 3a to 33n
Control unit 40 outputs ON and OFF signals to =37n
It is composed of.

In a device with such a configuration, the timing for turning ON and OFF the electromagnetic switches 36 and 37 a to 37 n is determined by the external input signal 42 in the control process.
A control signal is output when the control unit 40 receives the operation start input signal 41 and the feedback signals 35- to 35n from the loads 33 Hatake to 33n and processes them, and the electromagnetic switch 36
and electromagnetic switches 37a to 37- are operated, and each electromagnetic switch operates independently and completely unrelated.

Problems to be Solved by the Invention However, depending on the device, loads 33a to 33a as shown in FIG.
If 33n is under a high load, the flowing current capacity is large, so a large current will flow through the contacts when the electromagnetic switch is turned on and off. Furthermore, when the switch is turned on, a larger amount of current flows due to the inrush current.

Generally, in electromagnetic switches used in such devices, alloys such as silver-dyedium and silver-indium are often used as contact materials. Therefore, even if the current value is within the rated value, the current capacity is large, so if ON and OFF are repeated, transfer and welding phenomena of the contacts are likely to occur.

When the electromagnetic switch 36 and the electromagnetic switches 37a to 37n are repeatedly turned on or off at the same timing, a large current flows through the contacts of both the electromagnetic switches 36 and the electromagnetic switches 37a to 37n. In addition, the electromagnetic switch 37
The electromagnetic switch 36 is turned on while a to 37n are turned on.
Or, if it is repeatedly turned OFF, the current for all the combined loads will flow. When a large current flows in this manner, a transfer phenomenon or a welding phenomenon occurs, which shortens the life of the electromagnetic switch and becomes a major factor in causing failure of the load (remaining in an ON state). Furthermore, in order to guarantee these, it is necessary to use an electromagnetic switch with a large contact tolerance.

The present invention was made in view of these points, and aims to improve the reliability and cost performance of an electromagnetic switch.

Means for Solving the Problems In order to achieve the above objects, the electromagnetic switch control device of the present invention provides a control device for an electromagnetic switch of the present invention, in which a load group is driven by supplying power, and the control device starts operation in order to start driving the device. an operation start signal input means for inputting an input signal; a first electromagnetic switch for turning ON and OFF the power supplied to the load group based on the signal from the operation start signal input means; a second electromagnetic switch that turns on and off the power supplied to drive the load; and an electromagnetic switch 3 ON-OFF instruction means that instructs the second electromagnetic switch to turn on and off according to a device control procedure. , the signal from the operation start signal input means and the electromagnetic switch ON-OFF instruction means turns both the first electromagnetic switch and the second electromagnetic switch ON or OFF within a preset time. For example, an electromagnetic switch ON-O that instructs the electromagnetic switch to turn ON and OFF at different timings.
The configuration includes an FF timing determining means and an electromagnetic switch driving means for turning each electromagnetic switch ON and OFF based on a control signal from the electromagnetic switch ON/OFF timing determining means.

Operation The present invention has the above-mentioned configuration to control ON and OFF of each electromagnetic switch.
The reliability of the electromagnetic switch can be improved by reducing the transition phenomenon and welding phenomenon of the contacts of the electromagnetic switch due to a shift in F timing.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 shows the heater used in the vaporizing cylinder part of the oil hot air fan heater and its configuration. 1 is the main body of the oil hot air fan heater, 2 is the operation switch for opening the combustion, and 3 is the configuration diagram. A vaporizer cylinder for vaporizing oil; 4 a sheathed heater in the vaporizer cylinder; 5 an AC power source that supplies the heater; 6 an electromagnetic element that is turned ON and OFF to supply AC power by turning the operation switch 2 ON and OFF. 7 is an electromagnetic switch that turns on and off the sheathed heater 4, 8 is a load group such as various motors and pumps, 9 is a thermistor provided to detect the temperature of the sheathed heater, and 10 is the above-mentioned component. This is a control unit that controls the

When the fan heater is turned on and started,
When combustion temporarily stops due to a timer etc. during combustion and starts again, or when combustion stops due to an abnormal layer occurring during combustion and combustion starts again after the abnormal condition has been recovered, electromagnetic opening/closing occurs. When the container 6 is turned on, the vaporizer cylinder 3
When the thermistor 9 detects that the temperature is lower than a preset temperature, the electromagnetic switch 7 is turned on to supply the AC power 5 to the sheathed heater 4.

As for the configuration of the control section 10, first, the operation switch 2 and the combustion sequence control means 1 are controlled by the combustion start signal input means 11.
6, it is determined whether an ON signal to start combustion or an OFF signal to stop combustion has been input. Temperature detection means 1
At step 2, the signal from the thermistor 9 is input, and the current temperature of the vaporizer cylinder 3 is detected. The temperature detected by the temperature detection means 12 is input to the electromagnetic switch ON-OFF instruction means 13,
Based on the information, it is determined whether to turn on (or turn off) the sheathed heater 4, and an instruction signal for turning on (or turn off) is output. In the electromagnetic switch ON/OFF timing determination means 14, when the combustion start ON signal is inputted from the combustion start signal input means 11, the electromagnetic switch ON/OFF timing determination means 14 first turns on the electromagnetic switch ON.
- Determine whether or not an instruction signal from the OFF instruction means 13 is input, and if it is not input, the electromagnetic switch 6
An ON signal is output to the electromagnetic switch driving means 15 in order to turn on only the electromagnetic switch. Further, if an instruction signal from the electromagnetic switch ON-FF instruction means 13 is input, an ON signal is output to the electromagnetic switch driving means 15 to turn on the electromagnetic switch 7 together with the electromagnetic switch 6.

However, if the electromagnetic switch 6 and the electromagnetic switch 7 are turned on simultaneously or the electromagnetic switch 7 is turned on first, the contacts will be adversely affected as described in the above problem. Therefore, first, an ON signal is output to the electromagnetic switch driving means 15 to turn on the electromagnetic switch 6, and after a preset time has elapsed, an ON signal is output to the electromagnetic switch driving means 15 to turn on the electromagnetic switch 7. Output a signal. During combustion, the electromagnetic switch 6 remains ON, so if the temperature of the vaporizer cylinder 3 falls below a preset temperature, it is detected by the thermistor 9, and the temperature detection means 12 and the electromagnetic switch ON/OFF are detected. When the signal is inputted to the electromagnetic switch ON/OFF timing determining means 14 via the instruction means 13, an ON signal is directly output to the electromagnetic switch driving means 15. In addition, when the temperature of the vaporizing cylinder 3 rises above a preset temperature, it is detected by the thermistor 9 in the same way as described above, and the electromagnetic switch is turned on via the temperature detection means 12 and the electromagnetic switch ON-OFF instruction means 13. When input to the OFF timing determining means 14, the electromagnetic switch driving means 1
An OFF signal is output to 5.

Also, from the combustion start signal input means 11, the combustion stop signal
F” When the F signal is input, first the electromagnetic switch ON-OF
It is determined whether or not the instruction signal from the F instruction means 13 is input, and if it is not input, an OFF signal is output to the electromagnetic switch driving means 15 to turn off only the electromagnetic switch 6. Further, if the instruction signal from the electromagnetic switch ON-OFF instruction means 13 is input, the electromagnetic switch 6
At the same time, an OFF signal is output to the electromagnetic switch driving means 15 to turn off the electromagnetic switch 7. However, if the electromagnetic switch 6 and the electromagnetic switch 7 are turned off at the same time or the electromagnetic switch 6 is turned off first, the contacts will be adversely affected as described in the above problem. Therefore, first, the electromagnetic switch 7 should be turned off (the electromagnetic switch driving means 15 should be turned off).
After a preset time has elapsed after outputting the F signal, the electromagnetic switch 6 should be turned off (an OFF signal is output to the electromagnetic switch driving means 15).

Next, the operation of the fan heater configured as described above will be explained using the flowchart shown in FIG. When the fan heater operation switch is turned on and started, the ROM in the microcomputer
Heater control is started according to the procedure of the combustion heater control program shown in the flowchart of FIG. 2, which is stored in .

First, in step 21, the combustion start signal input means 11 determines whether an ON signal for starting combustion or an OFF signal for stopping operation has been input from the operation switch 2 or the combustion sequence control means 16.

If the ON signal is input, the process advances to step 22a, and the O
If the FF signal is input, the process advances to step 22b. In step 22, it is determined whether the electromagnetic switch 6 is turned on, and if it is turned on, the process proceeds to step 25-, and the electromagnetic switch 6 is turned on.
If not, turn the electromagnetic switch 6 to O in step 23.
To make it N, output ON. And step 24
At step a, a timer is started to measure the time to shift the timing of turning on the electromagnetic switches 6 and 7.

In step 25m, it is determined whether the timer started in step 24m has timed up, and if the timer has not timed up, the process proceeds to step 29, where the electromagnetic switch 7 is turned OFF (therefore, an OFF output is output. If so, proceed to step 26m.

In step 264, if the temperature of the vaporization cylinder 3 is below a preset temperature, the sheathed heater 4 must be turned on, so the thermistor 9 detects the temperature, and the temperature detection means 12 determines whether it is at a level that turns on the heater. If the level is such that the heater is turned on, the process proceeds to step 28m, and an ON output is made to turn on the electromagnetic switch 7.

If the level is not high enough to turn on the heater, the process advances to step 27-. In step 27m, similarly to step 26m, it is determined whether the level is such that the heater is turned off. If the current is at a level that turns off the heater, the process proceeds to step 29m, and an OFF output is output in order to keep the electromagnetic switch 7 OFF. If it is not at a level that turns off the heater, the process returns to step 21.

Next, in step 22b, it is determined whether the electromagnetic switch 7 is turned off, and if it is turned off, step 25b
If the electromagnetic switch 7 is not turned off, an OFF output is output in order to turn off the electromagnetic switch 7 in step 23b.

Then, in step 24b, the electromagnetic switches 6 and 7 are turned off.
Start a timer to measure the time to shift the timing. In step 25b, it is determined whether the timer started in step 24b has timed up, and if the timer has not timed up, step 25b
Proceed to step 29b, leave the electromagnetic switch 6 ON as it is (therefore, output an ON signal. If the time is up, proceed to step 29b, and output an OFF signal to turn the electromagnetic switch 6 OFF.
Output F.

Then, the process returns to step 21 again and the above operations are repeated.

According to the configuration of the above embodiment, when combustion starts, the electromagnetic switch 6 is first turned on, and then after a preset time has elapsed, the electromagnetic switch 7 can be turned on, and when the combustion is stopped, the electromagnetic switch 7 is turned on. OFF, and then turn OFF the electromagnetic switch 6 after a preset time has elapsed.
Therefore, when the electromagnetic switch 6 is operated, the electromagnetic switch 7 is always OFF, and when the large current of the sheathed heater 4 flows through the electromagnetic switch 6, it is turned ON and OFF.
Since FF is not performed, deterioration of the contacts can be suppressed.

More than the effects of the invention, as is clear from the examples, the present invention includes a load group driven by a power source, and a method for turning the load group ON and OFF, and for turning ON and OFF individual loads of the load group. In equipment that uses multiple electromagnetic switches,
By shifting the timing of turning ON and OFF the load, it is possible to reduce the load on the current capacity applied to the electromagnetic switch during ON and OFF.

With such a configuration, the present invention can reduce the transfer phenomenon and welding phenomenon of the contacts of the electromagnetic switch, and improve the reliability of the electromagnetic switch.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a control device in an embodiment of the present invention;
FIG. 2 is a flowchart showing an example of a heater control program based on the above embodiment, and FIG. 3 is a configuration diagram of a conventional device. 3... vaporizer cylinder, 4... sheathed heater,
5... AC power supply, 6... First electromagnetic switch, 7... Second electromagnetic switch, 8...
・Load group, 11... Combustion (operation) start input means, 13... Electromagnetic switch ON/OFF instruction means,
14... Electromagnetic switch ON-OFF timing determination means, 5... Electromagnetic switch driving means. Diagram

Claims (1)

[Claims] In a device in which a load group is driven by supplying power, a drive start signal input means inputs a drive start input signal to start driving the device, and a drive start signal input means inputs a drive start input signal to start driving the load group based on a signal from the drive start signal input means. The power supplied to O
A first electromagnetic switch that turns ON and OFF, a second electromagnetic switch that turns ON and OFF the power supplied to drive each load of the load group, and a second electromagnetic switch that turns ON and OFF the power supplied to drive the individual loads of the load group; The electromagnetic switch ON-OFF instruction means for instructing ON and OFF of the electromagnetic switch, and the signals from the operation start signal input means and the electromagnetic switch ON-OFF instruction means are activated to the first electromagnetic switch within a preset time. If both the electromagnetic switch and the second electromagnetic switch are to be turned on or off, the electromagnetic switch ON-OFF timing determination means that instructs the electromagnetic switch to turn on and off so as to shift the timing, and the electromagnetic switch A control device for an electromagnetic switch comprising an electromagnetic switch driving means for turning each electromagnetic switch ON and OFF in accordance with a control signal from an ON-OFF timing determining means.