JPS63106484A - Driving device for solenoid valve - Google Patents

Abstract

PURPOSE:To improve a speed of response and reduce an unnecessary power consumption by providing an ON/OFF set means for raising the driving force of a solenoid coil at the time of valve drive opening. CONSTITUTION:The command of a solenoid valve drive is inputted into a command input unit 12, a waveform shaping is performed in a control circuit 10 against the DC output of a driving source 30. First, in an ON/OFF set shaping unit, a voltage is raised up to the predetermined level and thereafter is gradually raised in an ON slope shaping unit 16. Next, in the lapse of the time T set by a slope time set unit 22, a voltage is lowered from VC to VB in a holding offset shaping unit 18. Therefore, the attracting force of the solenoid is maintained with a low coil driving current, thereby unnecessary heating of a solenoid coil 90 is suppressed.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The technical field of the invention relates to a solenoid valve drive device, and in particular 'i
This invention relates to improvement of tt magnetic coil drive control.

[Prior Art] As a conventional electromagnetic valve drive device, for example, Japanese Patent Application Laid-Open No. 1986-4
There is one disclosed in Publication No. 1085. According to this drive device, a large drive current flows at the beginning of energization of the electromagnetic coil, and feedback control of the drive current is performed so that the current level is the minimum holding current level of the electromagnetic valve at or after the completion of switching of the electromagnetic valve.

FIG. 2 shows a schematic configuration of such a conventional device. In this figure, a control circuit 92 is connected to an electromagnetic coil 90 of a solenoid valve (not shown), and the electric power of a drive power source 94 is controlled by the control circuit 92 to control the electromagnetic coil 90.
It is now added to.

The control circuit 92 includes an excitation circuit 92A that supplies a large current at the initial stage of energization of the electromagnetic coil 90, a holding excitation circuit 92B that supplies a minimum current necessary for holding the solenoid valve, and an excitation circuit 92A.
A determination circuit 92C that determines whether the current value supplied to the electromagnetic coil 90 by A is a current required for switching the electromagnetic valve is included.

Next, the operation of the above conventional example will be explained.

First, a large current is supplied to the electromagnetic coil 90 by the excitation circuit 92A. At this time, the drive current flowing through the electromagnetic coil 90 gradually increases, but eventually reaches the current I1 necessary for switching the electromagnetic valve.

When this is determined by the determination circuit 92C, the holding excitation circuit 92B starts operating. That is, the electromagnetic coil 90 is supplied with the minimum holding current necessary to maintain the state of the electromagnetic valve.

[Problems to be Solved by the Invention] However, in one or more conventional devices, the start of energization of the electromagnetic coil and the start of operation of the electromagnetic valve do not necessarily coincide, resulting in a disadvantage that responsiveness is not good.

Further, unnecessary power consumption occurs when the electromagnetic coil starts to be energized, which causes heat generation and shortens the life of the electromagnetic coil.

The unreleased Ill was developed in consideration of the above points, and its purpose is to provide a solenoid valve drive device that can improve responsiveness, reduce energy consumption, and extend the life of the solenoid valve. It is something to do.

[Means and operations for solving the problems] The present invention is characterized in that it includes an on-offset means for increasing the driving force of the electromagnetic coil at the start of valve driving.

According to the present invention, the drive voltage is raised by the on-offset means and then applied to the electromagnetic coil. The valve is quickly driven from this rising state.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

Note that the same reference numerals are used for the same components as in the conventional example described above.

FIG. 1 shows an embodiment of the electromagnetic valve drive device according to the present invention, which controls the voltage and is formed as an on-offset means to instantly raise the voltage at the start of valve drive. There is. In this figure, a control circuit 10 is connected to an electromagnetic coil 90 of a solenoid valve (not shown), so that the DC output of the drive power source 30 is waveform-shaped by the control circuit 10 and input to the electromagnetic coil 90. It has become.

The driving power source 30 is AC power (for example, commercial 50 or 60
It obtains direct current power from H2, 100V) and is constructed using diodes, thyristors, etc., and its output voltage value is changed by a variable resistor 32.

Next, the control circuit 10 has a plurality of circuit sections for waveform shaping. First, the external command for driving the solenoid valve is input to the command input section 1.
2, and waveform shaping and output are performed based on this.

Next, as shown in FIG. 3(A), the on-offset shaping section 14 generates an on-offset voltage V at the rise of the output voltage.
A is set, and the value of VA can be set using a variable resistor 14H.

Next, the on-slope shaping section 16 sets the slope SA after the output voltage rises, and the degree of the slope can be set by a variable resistor 16R.

Next, the holding offset shaping section 18 secures a current necessary to maintain the state after the valve is operated, and sets a holding offset voltage VB.

The value of this VB can be set by a variable resistor 18H.

Next, the off-slope shaping section 20 sets the off-slope SR when the output power supply falls, and the degree of the slope can be set by a variable resistor 20R.

Note that the maximum value VC of the output voltage can be set by a variable resistor 32 of the drive voltage 30.

Next, the slope time T during on and off times can be set by the slope time setting section 22, and its length can be set by the variable resistor 22R. This slope time T corresponds to the time required for the valve to move as it opens and closes, so it is the same at the time of rising and falling, but it can be set differently if necessary. good.

Next, the overall operation of the above embodiment will be explained with reference to the time chart of FIG.

First, when a command to drive the electromagnetic valve is issued to the command input section 12 from the outside, the control circuit 10 performs waveform shaping on the DC output of the drive power source 30 .

First, the on-offset shaping section 14 generates a predetermined voltage vA.
It can be launched up to. This value of VA is not so high that the valve solenoid (not shown) is completely attracted to the electromagnetic coil 90.

Therefore, the on-slope shaping section 16 shapes the voltage so that it gradually increases.

When the above voltage is applied to the electromagnetic coil 90, the valve moves and opens as shown in FIGS. 3(B) and 3(C).
becomes the state of

Next, the time T set by the slope time setting section 22
When , the holding offset shaping unit 18 reduces the voltage from VC to VB.

The reason why the voltage is reduced to the holding offset voltage VB in this way is that in order to maintain the valve state, that is, the attraction force of the solenoid, a low coil drive current due to such a low voltage is sufficient, and it is not necessary to flow a higher current than necessary. and electromagnetic coil 9
This is because inconveniences such as causing unnecessary heat generation occur.

Next, after changing the holding offset voltage to VB, when a closing operation of the solenoid valve is commanded from the outside to the command input section 12, the off-slope shaping section 20 gradually increases the voltage according to the time set in the slope time setting section 22. is lowered (Fig. 3 (
(see A)), this operation causes the valve to gradually move (see figure (B)), and the valve is closed 1! i (see figure (C))
.

That is, as described above, before the command to close the valve is issued, only the drive current necessary to maintain the valve open state flows through the electromagnetic coil 90 due to the holding offset voltage VB.

Therefore, if the valve is commanded to close and the voltage begins to drop even slightly, the valve will not be able to maintain its open state and will quickly shift to its closed state.

As explained above, this embodiment has the following effects.

First of all, since the drive voltage of the electromagnetic coil 90 rises steeply, the opening operation of the valve is started with good response, power consumption is reduced, and unnecessary heat generation is prevented.

Second, after the valve is opened, the value of the drive current is set to the lowest threshold value necessary to maintain the state, so unnecessary power consumption is reduced and the power output is reduced.

Thirdly, the valve closes quickly, and the responsiveness of the closing operation also improves.

Fourthly, as the valve is opened and closed with good responsiveness using the required drive current, the impact applied to the valve during opening and closing is alleviated.

Next, a specific design example of the above embodiment will be explained with reference to FIG. 4.

FIG. 4 shows a design example of the embodiment of FIG. In this example, a control circuit IO is designed using a commercially available IC. An example of measuring the output voltage waveform of this example is shown in FIG.

Further, the one shown in FIG. 6 is formed as an on-offset means so as to rise slightly at the start of valve drive.

More specifically, the voltage is first raised to vO a little before driving the solenoid valve, and then, when the solenoid valve is actually operated, the voltage for moving the solenoid valve is applied.

With this configuration, when the timing of excitation of the electromagnetic coil 90 is known in advance.

A little before excitation, the voltage is increased by (vA-VO), and then the on-slope shaping section 16 shapes the voltage so that it gradually increases.

Therefore, compared to the embodiments shown in FIGS. 1 to 5, the voltage to be increased is as low as (VA-VO), so the responsiveness is further improved.

Furthermore, the one shown in FIG. 7 is formed as an on-offset means so as to be continuously turned on before the start of valve driving.

More specifically, the voltage of the electromagnetic coil 90 is always raised to vO, and then when the electromagnetic valve is actually operated, a voltage for moving the electromagnetic valve is applied.

With this configuration, even when the timing of excitation of the electromagnetic coil 90 is not known in advance, the voltage is simply increased by (■A-vO) slightly before the excitation,
Then, the on-slope shaping section 16 shapes the voltage so that it gradually increases.

Therefore, like the embodiments shown in FIGS. 1 to 5, the magnet can be excited at any time.

Compared to the embodiments shown in FIGS. 1 to 5, the voltage to be increased is as low as (V A -V O), so the responsiveness is further improved.

Although a detailed design example is omitted, the solenoid valve drive device according to the present invention can achieve the same characteristics and effects by changing the current while keeping the voltage A4 constant, instead of controlling the voltage. It is something that plays.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the waveform shaping circuit can have various configurations. Further, if necessary, a protection circuit for overvoltage, overcurrent, noise, temperature change, etc. may be provided.

[Effects of the Invention] As explained above, according to the present invention, the drive voltage for the electromagnetic coil is instantaneously raised, so that the response speed can be improved and unnecessary power consumption can be reduced. This has the effect of extending the lifespan due to the reduction in heat generation.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing one embodiment of the present invention, and FIG.
The figure shows a circuit block showing a conventional example, Fig. 3 is a diagram showing the operation of the embodiment shown in Fig. 1, Fig. 4 is a circuit diagram showing a design example, and Fig. 5 shows the output characteristics of the design example shown in Fig. 4. FIG. 6 is a diagram showing the operation of another embodiment, and FIG. 7 is a diagram showing the operation of still another embodiment. 10... Control circuit 12... Command input section 14
...On-offset shaping section 16...On-slope shaping section 18...Protection offset shaping section 20...Off-slope shaping section 22...Slope time setting section

Claims (6)

[Claims] 1. A solenoid valve drive device that maintains a valve in an open/closed state by applying a driving force of a value different from that during driving to an electromagnetic coil, characterized by comprising an on-offset means for raising the driving force when the valve starts to be driven. Solenoid valve drive device. 2. The electromagnetic valve drive device according to claim 1, wherein a drive voltage is used as the drive force for controlling the electromagnetic coil. 3. The electromagnetic valve drive device according to claim 1, wherein a drive current is used as the drive force for controlling the electromagnetic coil. 4. Claim 1, wherein the on-offset means is formed to instantaneously start up at the start of valve drive;
The electromagnetic valve drive device according to item 2 or 3. 5. The electromagnetic valve drive device according to claim 1, 2 or 3, wherein the on-offset means is configured to start up slightly before the start of the valve drive. 6. The electromagnetic valve drive device according to claim 1, 2 or 3, wherein the on-offset means is formed so as to be continuously turned on before starting the valve drive.