JP2011086741A - Device for driving electromagnetic actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for driving an electromagnetic actuator capable of efficiently performing manufacture and management. <P>SOLUTION: This device includes a plurality of electromagnetic actuators 14 and a constant voltage circuit 17. The electromagnetic actuator 14 includes a driving solenoid coil 14a. The constant voltage circuit 17 converts an input voltage in a predetermined range to a constant voltage to be output, and applies the output voltage to the solenoid coils 14a of the plurality of electromagnetic actuators 14 connected in parallel to one another. The plurality of electromagnetic actuators 14 and the constant voltage circuit 17 are formed as one unit wherein they are integrally mounted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electromagnetic actuator driving device used for driving an electromagnetic actuator having a solenoid coil.

  Conventionally, for example, an electromagnetic actuator is often used as an actuator for controlling the operation of a device to be controlled, such as an electromagnetic valve provided in a fluid circuit (see, for example, Patent Document 1). This electromagnetic actuator includes a driving solenoid coil and a plunger as a movable member, and is operated by changing the movement position of the plunger through energization control of the solenoid coil.

  In addition, in an apparatus provided with a plurality of electromagnetic actuators, it is often used to use a unit that is integrally attached to the electromagnetic actuators.

Japanese Patent Laid-Open No. 2004-23942

  Here, the voltage of the power source used for power supply to the electromagnetic actuator is not the same, and varies depending on the region where it is used, the device used, and the like. In order to meet the demands of users, it is necessary to cope with such various power supply voltages, and therefore various types of products with different specifications (for example, rated voltages) must be prepared as electromagnetic actuators.

  However, an increase in the product lineup is not preferable because this becomes one factor that hinders the efficiency of manufacturing and management of the electromagnetic actuator. Conventional devices have room for improvement in this respect.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electromagnetic actuator driving apparatus that can be efficiently manufactured and managed.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
The invention according to claim 1 is an electromagnetic actuator driving device that includes a plurality of electromagnetic actuators having a solenoid coil for driving, and drives the electromagnetic actuators, wherein an input voltage within a predetermined range is a constant voltage. And a constant voltage circuit that applies the output voltage to the solenoid coils of the plurality of electromagnetic actuators connected in parallel. The plurality of electromagnetic actuators and the constant voltage circuit are integrated with each other. The gist is that it is formed as a single unit attached.

  According to the above configuration, even when the input voltages are different, this can be converted into a constant voltage by the constant voltage circuit and supplied to the solenoid coil of each electromagnetic actuator. Therefore, a wide range of input voltages can be dealt with by the electromagnetic actuator having the same specification, which increases the versatility of the apparatus and reduces the product lineup. In addition, power can be supplied from a common constant voltage circuit to the solenoid coils of a plurality of electromagnetic actuators, and the number of components can be reduced as compared with a configuration in which constant voltage circuits are separately provided for the solenoid coils. Therefore, according to the above configuration, it is possible to increase the efficiency of manufacturing the electromagnetic actuator driving device.

  In addition, since the electromagnetic actuator driving device is integrally formed as one unit, the device can be easily managed as compared with the case where a plurality of electromagnetic actuators and constant voltage circuits are separately managed.

  According to a second aspect of the present invention, in the electromagnetic actuator driving device according to the first aspect, the constant voltage circuit and the solenoid coil include a constant current circuit that converts an input current into a constant current and outputs the constant current. The constant current circuit is provided corresponding to each of the plurality of electromagnetic actuators and is included in the unit.

  According to the above configuration, a constant current changed by the constant current circuit can be supplied to each solenoid coil, and an error in the supply current to these solenoid coils can be suppressed to a small value. Therefore, the electromagnetic actuator driving device can be made easy to use.

  According to a third aspect of the present invention, in the electromagnetic actuator driving device according to the second aspect, a change circuit for changing a current output from the constant current circuit is provided, and the change circuit is included in the unit. The gist of this is

  According to the above configuration, for example, when energizing the solenoid coil to move the movable member of the electromagnetic actuator, a large current is supplied to the solenoid coil, and a small current is supplied when the movable member is held at the stop position at that time. As described above, the supply current to the solenoid coil can be appropriately adjusted by the changing circuit in accordance with the operating state of the electromagnetic actuator. Therefore, the usability of the electromagnetic actuator driving device can be improved.

  According to a fourth aspect of the present invention, in the electromagnetic actuator driving device according to any one of the first to third aspects, the constant voltage circuit is a switching type constant that converts the input voltage through a switching operation of a semiconductor element. Its gist is that it is a voltage circuit.

  According to the above configuration, the constant voltage circuit, and thus the electromagnetic actuator driving device, has higher operating efficiency than a device that employs a linear constant voltage circuit composed of, for example, a three-terminal regulator or a resistor. be able to.

  According to a fifth aspect of the present invention, in the electromagnetic actuator driving device according to any one of the first to fourth aspects, the constant voltage circuit and the solenoid coil include an energized state and a non-energized state of the solenoid coil. The switch circuit is connected via a switch circuit for switching between the plurality of electromagnetic actuators, and is provided corresponding to each of the plurality of electromagnetic actuators and included in the unit.

  According to the said structure, the operation state of a several electromagnetic actuator can be separately controlled through operation of each switch circuit.

  According to the present invention, it is possible to efficiently manufacture and manage the electromagnetic actuator driving device.

1 is a plan view of an electromagnetic actuator driving apparatus according to a first embodiment that embodies the present invention; The circuit diagram which shows the drive circuit for driving each electromagnetic actuator. The circuit diagram which shows a switch circuit. The circuit diagram which shows the constant current circuit concerning 2nd Embodiment which actualized this invention. The timing chart which shows an example of the electricity supply mode to a solenoid coil. The circuit diagram which shows the constant current circuit concerning other embodiment. The circuit diagram which shows the constant current circuit concerning other embodiment. The circuit diagram which shows the constant current circuit concerning other embodiment. The circuit diagram which shows the constant current circuit concerning other embodiment.

(First embodiment)
Hereinafter, an electromagnetic actuator driving apparatus according to a first embodiment embodying the present invention will be described.

FIG. 1 shows a planar structure of the electromagnetic actuator driving apparatus according to the first embodiment.
As shown in FIG. 1, a power supply terminal 11 and an input terminal 12 are provided on a surface 10 a on one side (the front side in FIG. 1) of the base portion 10. When using the electromagnetic actuator driving apparatus according to the present embodiment, an AC power supply (commercial power supply or the like) or a DC power supply (storage battery or the like) is connected to the power supply terminal 11 to supply power to the apparatus. A programmable logic controller (hereinafter referred to as “PLC”) configured to include a relay output circuit, a triac output circuit, or the like is connected to the input terminal 12, and a signal for driving the electromagnetic actuator 14 from the PLC. Is entered.

  A plurality (six in this embodiment) of valve bodies 10b are integrally attached to the surface 10a of the base portion 10, and electromagnetic actuators 14 are integrally attached to the valve bodies 10b. . Inside each valve body 10b, there is formed a passage for communicating a circuit (fluid control circuit) for switching a fluid flow path and the electromagnetic actuator 14. Each electromagnetic actuator 14 incorporates a plunger as a movable member, a spring that urges the plunger in one direction, and a solenoid coil (all not shown) for moving the plunger against the urging force of the spring. is doing.

FIG. 2 shows a drive circuit for driving each electromagnetic actuator 14.
As shown in FIG. 2, a full-wave rectifier circuit 15 and a smoothing capacitor 16 each composed of a plurality of (four in this embodiment) diodes 15a are connected to the power supply terminal 11 in parallel. The power supply terminal 11 is connected to the constant voltage circuit 17 through the full wave rectifier circuit 15 and the smoothing capacitor 16. The constant voltage circuit 17 converts an input voltage into a constant voltage and outputs the voltage, and applies the output voltage to the solenoid coils 14a of a plurality of electromagnetic actuators 14 connected in parallel. The switching type constant voltage circuit converts the output voltage through the switching operation.

  The positive terminal (power supply [+] terminal 11a) of the input side terminal of the constant voltage circuit 17 is connected to the input side coil 19a of the transformer 19, and the input side coil 19a is a semiconductor element (specifically, a field effect transistor). A drain terminal and a source terminal of [FET 20] and a resistor 21 are connected to the negative terminal (power source [−] terminal 11b) of the input side terminal of the constant voltage circuit 17. The output side coil 19 b of the transformer 19 is connected between the output terminals 22 of the constant voltage circuit 17.

  The power source [+] terminal 11a is connected to the VCC terminal of the switching IC 18 via the voltage stabilizing circuit 23 and the voltage dividing circuit 24 constituted by two resistors. In the present embodiment, the voltage applied to the power source [+] terminal 11a is converted into stable power with small voltage fluctuations by the voltage stabilizing circuit 23, and then the voltage is stepped down by the voltage dividing circuit 24 and then applied to the switching IC 18. Entered.

  The OUT terminal of the switching IC 18 is connected to the FET 20 (specifically, its gate terminal). The source terminal of the FET 20 is connected to the CL terminal of the switching IC 18. The switching IC 18 grasps the amount of current flowing through the input side coil 19a of the transformer 19 based on the potential of the source terminal of the FET 20 inputted to the CL terminal, and changes its operation mode according to the grasped amount of current. It is supposed to be.

  Between the output terminal 22 of the constant voltage circuit 17, a Zener diode 25 and a photocoupler 26 (specifically, a light emitting element thereof) connected in series are connected in parallel with the output side coil 19 b of the transformer 19. . The photocoupler 26 (specifically, the light receiving element) is connected between the FB terminal of the switching IC 18 and the power source [−] terminal 11b.

Further, between the output terminal 22 of the constant voltage circuit 17, a light emitting diode 27 and a resistor 28 connected in series and a smoothing capacitor 29 are connected in parallel.
Furthermore, between the output terminals 22 of the constant voltage circuit 17, a constant current circuit 30 that converts an input current into a constant current and outputs the current, a solenoid coil 14a of the electromagnetic actuator 14, and energization of the solenoid coil 14a. A plurality of switch circuits 31 that switch between a state and a non-energized state are connected in series (six in this embodiment [only two are shown in FIG. 1)]. The constant current circuit 30, the solenoid coil 14a and the switch circuit 31 connected in series are provided corresponding to each electromagnetic actuator 14 and connected in parallel. A diode 32 is connected in parallel to each solenoid coil 14a. The constant current circuit 30 is composed of two transistors 33 and 34 and two resistors 35 and 36. As shown in FIG. 3, the switch circuit 31 includes a photocoupler 31a, a transistor 31b, resistors 31c, 31d, and 31e. The switch circuit 31 has a structure in which an input side circuit and an output side circuit are insulated by a photocoupler 31a. Specifically, a signal from the PLC 13 (a signal having the same voltage as the voltage input to the power supply terminal 11) is input to the light emitting element of the photocoupler 31a, while the constant voltage circuit 17 is applied to the light receiving element of the photocoupler 31a. (The voltage at the output [+] terminal 22a) is applied. Each switch circuit 31 is connected to the PLC 13 (FIG. 2) via the input terminal 12.

Hereinafter, an operation mode of the electromagnetic actuator driving device according to the present embodiment will be described.
The power (AC power or DC power) input from the power supply terminal 11 becomes DC power via the full-wave rectifier circuit 15 and the smoothing capacitor 16. This DC power is changed to voltage stable power via the voltage stabilizing circuit 23, and after being divided by the voltage dividing circuit 24, is input to the switching IC 18.

  The switching IC 18 outputs a pulse-like signal at a predetermined cycle from its OUT terminal, and changes the duty ratio (ratio between on time and off time) of the signal to modulate the pulse width modulation control (so-called PWM control). Execute. When a signal is output from the OUT terminal of the switching IC 18 by the switching operation associated with the PWM control, the FET 20 connected thereto is turned on, and a current flows through the input side coil 19a of the transformer 19, and at this time The output side coil of the transformer 19 also enters a state where current flows. On the other hand, when the signal from the OUT terminal of the switching IC 18 is not output, the FET 20 is turned off so that no current flows through the input side coil 19a of the transformer 19, and the current also flows through the output side coil 19b of the transformer 19. No state.

  The output of the constant voltage circuit 17 to which the output side coil 19b is connected is adjusted by adjusting the time during which the current flows through the output side coil 19b of the transformer 19 and the time during which the current does not flow through the switching operation. The voltage (specifically, the average value) generated between the terminals 22 is adjusted.

  In the switching IC 18, a voltage within a predetermined range (for example, a range in which a DC voltage of 20 to 200 volts is input to the voltage stabilization circuit 23) is input to the power supply terminal 11 of the constant voltage circuit 17. In some cases, it is designed in advance to output a predetermined voltage V (specifically, a constant voltage [10.0 volts]) to the output terminal 22. Note that the pulsation of the output voltage caused by the switching operation of the switching IC 18 is smoothed by the smoothing capacitor 29 connected to the output terminal 22 of the constant voltage circuit 17.

  The constant voltage circuit 17 according to the present embodiment feeds back a signal corresponding to the voltage between the output terminals 22 to the FB terminal of the switching IC 18 by the Zener diode 25 and the photocoupler 26 to change the operation mode of the switching IC 18. It has a feedback function. Specifically, when the reverse voltage applied to the Zener diode 25 exceeds the breakdown voltage (10.0 volts in this embodiment), a reverse current flows through the Zener diode 25 and the photocoupler 26 is turned on to perform switching. The potential of the FB terminal of the IC 18 is lowered. At this time, the switching IC 18 reduces the voltage output between the output terminals 22 of the constant voltage circuit 17 by shortening the time during which a signal is output from the OUT terminal. The constant voltage circuit 17 is designed in advance so as to adjust the voltage between the output terminals 22 to a predetermined voltage V through such feedback control.

  In the present embodiment, the light emitting diode 27 is lit when a voltage is output between the output terminals 22 of the constant voltage circuit 17. Therefore, it can be confirmed that the voltage is output between the output terminals 22 of the constant voltage circuit 17 by turning on the light emitting diode 27.

  The constant current circuit 30 and the switch circuit 31 are connected to each solenoid coil 14 a connected between the output terminals 22 of the constant voltage circuit 17. When the switch circuit 31 is turned on by a signal input from the PLC 13, a current flows through the solenoid coil 14a corresponding to the switch circuit 31, and the corresponding electromagnetic actuator 14 is activated. As described above, in the present embodiment, the operation states of the plurality of electromagnetic actuators 14 are individually controlled through the operation of the switch circuits 31.

  At this time, the current is expressed as “positive terminal of output terminal 22 of constant voltage circuit 17 (output [+] terminal 22a) → switch circuit 31 → constant current circuit 30 → solenoid coil 14a → negative electrode of output terminal 22 of constant voltage circuit 17 (output [ -] Terminal 22b) ". Therefore, a constant current (predetermined current I) converted and adjusted by the constant current circuit 30 is supplied to each solenoid coil 14a, and an error in the supply current to these solenoid coils 14a is suppressed to a small level. . As a result, the electromagnetic actuator driving device can be made easy to use.

  As described above, in this embodiment, the voltage input between the power supply terminals 11 is changed to the predetermined voltage V by the constant voltage circuit 17 and output, and the predetermined current is output by the constant current circuit 30 based on the output voltage. The current adjusted to I is supplied to the solenoid coil 14a.

  In the present embodiment, even when the voltage input to the power supply terminal 11 is different, the electromagnetic wave is converted into a constant voltage by the full-wave rectifier circuit 15, the smoothing capacitor 16, and the constant voltage circuit 17. 14 solenoid coils 14a. Therefore, a wide range of input voltages can be handled by the electromagnetic actuator 14 having the same specification, which increases the versatility of the apparatus and reduces the product lineup.

  Here, the linear type constant voltage circuit composed of a three-terminal regulator, a resistor, etc. is a type that drops the voltage by consuming energy due to heat. It tends to be low. On the other hand, the switching type constant voltage circuit is a type that drops the voltage by intermittently setting the power output state. Low energy consumption and high operating efficiency. In the present embodiment, since the switching type constant voltage circuit 17 is provided, the constant voltage circuit 17 and the electromagnetic actuator driving device are operated more efficiently than the device provided with the linear type constant voltage circuit. Can be high.

  In general, an electromagnetic actuator having a high rated voltage tends to increase in size because the number of turns of the solenoid coil increases and the solenoid coil tends to increase in size. In addition, if the solenoid coil is formed by using a thin conductive wire in order to avoid such an increase in the size of the solenoid coil, the quality of the electromagnetic actuator is reduced or difficult to form due to the fact that the conductive wire is easily broken or burned out. As a result, the production efficiency of the electromagnetic actuator may be reduced.

  In the present embodiment, the predetermined voltage V converted by the constant voltage circuit 17, that is, a voltage lower than the voltage input to the power supply terminal 11 is applied to the solenoid coil 14 a and the constant current circuit 30. Even when the applied voltage is high, the electromagnetic actuator 14 having a low rated voltage (5.0 volts in this embodiment) can be used. Therefore, compared with a device in which the constant voltage circuit 17 is not provided, the solenoid coil 14a having a small number of turns formed using a thick conducting wire can be used, and the electromagnetic actuator 14 can be reduced in size and quality can be improved. In addition, the production efficiency can be improved.

  Further, in the present embodiment, since power is supplied from the common constant voltage circuit 17 to the solenoid coils 14a of the plurality of electromagnetic actuators 14, the configuration is compared with a configuration in which a constant voltage circuit is provided for each solenoid coil 14a. The number of parts can be reduced. Therefore, it is possible to increase the efficiency of manufacturing the device, and it is possible to reduce the size and cost of the device.

  Further, in the present embodiment, the electromagnetic actuator driving device includes a full-wave rectifier circuit 15, smoothing capacitors 16, 29, a plurality of electromagnetic actuators 14, a constant voltage circuit 17, a light emitting diode 27, a resistor 28, a constant current circuit 30, and It is formed as one unit in which components such as the switch circuit 31 are integrally attached. Therefore, for example, it is possible to save the trouble of preparing each component separately when the device is used by the user, and the device can be managed more easily than when managing each component separately. be able to.

As described above, according to the present embodiment, the effects described below can be obtained.
(1) The electromagnetic actuator 14 having the same specification can cope with a wide range of input voltages, thereby increasing the versatility of the apparatus and reducing the product lineup. In addition, power can be supplied from the common constant voltage circuit 17 to the solenoid coils 14a of the plurality of electromagnetic actuators 14, and the number of components is reduced compared to a configuration in which the solenoid coils 14a are separately provided with constant voltage circuits. be able to. Therefore, it is possible to improve the efficiency of manufacturing the device. In addition, since the components such as the plurality of electromagnetic actuators 14, the constant voltage circuit 17, the constant current circuit 30, and the switch circuit 31 are formed as a single unit, they are managed separately. Compared with the case where it does, management of the same apparatus can be performed easily.

  (2) The constant voltage circuit 17 and each solenoid coil 14a are connected via the constant current circuit 30, respectively. Therefore, a constant current changed by the constant current circuit 30 can be supplied to each solenoid coil 14a, and an error in the supply current to these solenoid coils 14a can be suppressed small. Therefore, the electromagnetic actuator driving device can be made easy to use.

  (3) Since the switching-type constant voltage circuit 17 is provided, the constant-voltage circuit 17, and thus the electromagnetic actuator driving device, has a higher operating efficiency than the apparatus provided with the linear-type constant voltage circuit. be able to.

(4) Since the constant voltage circuit 17 and each solenoid coil 14 a are connected via the switch circuit 31, the operation states of the plurality of electromagnetic actuators 14 can be individually controlled through the operation of the switch circuit 31. it can.
(Second Embodiment)
Hereinafter, an electromagnetic actuator driving apparatus according to a second embodiment that embodies the present invention will be described focusing on differences from the first embodiment.

  The electromagnetic actuator driving apparatus according to the present embodiment is different from the electromagnetic actuator driving apparatus according to the first embodiment only in that a change circuit for changing the current output from the constant current circuit is provided. .

  The electromagnetic actuator 14 differs in the amount of energization current to the solenoid coil 14a that is necessary for proper operation according to its operating state. Specifically, the solenoid coil 14a is attracted and moved in comparison with the amount of energization current required when the movement of the plunger by energization of the solenoid coil 14a is completed and the plunger is held at that position. The amount of current required for energizing is large. In order to make the electromagnetic actuator driving device highly efficient, it is desirable to adjust and control the amount of current flowing to the solenoid coil 14a in accordance with such a situation.

FIG. 4 shows a constant current circuit 40 according to the present embodiment.
As shown in FIG. 4, the constant current circuit 40 according to the present embodiment is provided with a change circuit 41 for changing the output current of the identification current circuit 40. The change circuit 41 is provided in each of the constant current circuits 40 corresponding to each electromagnetic actuator 14 in order to execute adjustment control of the amount of current flowing to the solenoid coil 14a.

  The constant current circuit 40 includes the two transistors 33 and 34 and the two resistors 35 and 36 as in the constant current circuit 30 (see FIG. 1) of the first embodiment. The change circuit 41 includes a transistor 42 and a resistor 44 connected in series. The transistor 42 and the resistor 44 are connected to the resistor 36 in parallel. A microcomputer 43 is connected to the base of the transistor 42.

  When the transistor 42 is activated (ON state), a current flows through the resistor 44, so that the resistance value between the base and emitter of the transistor 34 is determined by the resistor 44 and the resistor 36. become. On the other hand, when the transistor 42 is inactivated (off state), no current flows through the resistor 44 at this time, so that the resistance value between the base and the emitter of the transistor 34 is determined only by the resistor 36. Become. Therefore, by controlling the operation of the transistor 42 by the microcomputer 43, the resistance value between the base and the emitter of the transistor 34 is changed, and the amount of current output from the constant current circuit 40 is adjusted.

  In the present embodiment, the electromagnetic actuator driving device includes the constant current circuit 40, the change circuit 41, the microcomputer 43, the full-wave rectifier circuit 15 (FIG. 1), the smoothing capacitors 16, 29, the plurality of electromagnetic actuators 14, The components such as the constant voltage circuit 17, the light emitting diode 27, the resistor 28, the constant current circuit 30, and the switch circuit 31 are formed as one unit integrally attached.

The operation control of the transistor 42 by the microcomputer 43 is executed based on the following idea.
FIG. 5 shows an example of a manner of energizing the solenoid coil 14a.

  When energization to the solenoid coil 14a is started to move the plunger of the electromagnetic actuator 14 by a signal input from the PLC 13 (time t1 in FIG. 5), the microcomputer 43 first detects the start of energization to the solenoid coil 14a. At this time, since a relatively large current is required to move the plunger, the microcomputer 43 turns on the transistor 42 so that the energization current amount of the solenoid coil 14a becomes large. After that, while the plunger is moving, the microcomputer 43 keeps the transistor 42 in the ON state (at the same time t1 to t2).

  Thereafter, when the movement of the plunger is completed and the movement position of the plunger is maintained (at the same time t2), it is necessary to suck the plunger by the solenoid coil 14a at this time, but a large current is not necessary. 43 turns off the transistor 42 so that the amount of current flowing through the solenoid coil 14a is relatively small.

  When the energization to the solenoid coil 14a is stopped to move the plunger by the biasing force of the spring (at the same time t3), the switch circuit 31 is turned off by the stop of the signal input from the PLC 13, and the solenoid coil The energization to 14a is stopped.

  As described above, in the present embodiment, when the solenoid coil 14a is energized to move the plunger of the electromagnetic actuator 14, a large current is supplied to the solenoid coil 14a, and the movement of the plunger is completed to change the position of the plunger. The supply current to the solenoid coil 14 a can be appropriately adjusted by the change circuit 41 in a manner corresponding to the operating state of the electromagnetic actuator 14 such as supplying a small current when holding. Therefore, the usability of the electromagnetic actuator driving device can be improved. Further, when holding the position of the plunger, it is possible to reduce the power consumption of the electromagnetic actuator driving device as compared with a device that supplies a large current to the solenoid coil 14a as in the case of moving the plunger.

As described above, according to the present embodiment, in addition to the same effects as the above (1) to (4), the effect described in the following (5) can be obtained.
(5) Since the change circuit 41 is provided, the supply current to the solenoid coil 14a can be appropriately adjusted according to the operating state of the electromagnetic actuator 14, and the usability of the electromagnetic actuator driving device can be improved. it can.
(Other embodiments)
Each of the above embodiments may be modified as follows.

In the first embodiment, a microcomputer may be provided in place of the PLC 13.
In the first embodiment, the constant current circuit 30 includes transistors 33 and 34 and resistors 35 and 36. The configuration of the constant current circuit is not limited to this, and can be arbitrarily changed as long as the circuit can output a constant current. Specifically, for example, a circuit using an FET 51 and a resistor 52 such as a constant current circuit 50 shown in FIG. 6 or a three-terminal regulator 61 like a constant current circuit 60 shown in FIG. Can be used. In addition, a circuit using an operational amplifier can be employed as the constant current circuit.

  In the second embodiment, instead of the constant current circuit 40, a constant current circuit 70 including an FET 71 and a resistor 72 may be adopted as shown in FIG. In this configuration, a transistor 73 and a resistor 74 are provided in parallel with the resistor 72, and the microcomputer 43 is connected to the base of the transistor 73.

  Further, as the constant current circuit, a circuit using a three-terminal regulator (see FIG. 7), a circuit using an operational amplifier, or the like may be employed. Even with such a configuration, for example, a second change circuit for changing the current output from the constant current circuit, such as a change circuit having a transistor and a resistor connected in parallel to the resistor of the constant current circuit, is provided. The same effect as in the embodiment can be obtained.

  In the second embodiment, instead of connecting a microcomputer to the base of the transistor, a voltage is applied in accordance with the ON operation of the switch circuit 31 in the constant current circuit 80 as shown in an example in FIG. A capacitor 81 may be provided between the portion to be formed and the base of the transistor 42. In the configuration, in the process in which electric charge is stored in the capacitor 81 by supplying power to the constant current circuit 80 by turning on the switch circuit 31, the transistor 42 whose base is connected to the capacitor 81 is turned on and the resistor 44 is turned on. A current starts to flow through. When the accumulation of charge in the capacitor 81 is completed, the transistor 42 is turned off and no current flows through the resistor 44. As described above, according to the above configuration, when the switch circuit 31 is turned on to operate the electromagnetic actuator 14, the constant current circuit is used for a predetermined period immediately after, that is, a period in which the plunger of the electromagnetic actuator 14 is attracted and moved. The output current of 80 can be temporarily increased.

  -In 2nd Embodiment, the electricity supply aspect to the solenoid coil 14a is not restricted to the electricity supply aspect shown in FIG. 5, It can change arbitrarily. Specifically, the magnitude of vibration of the electromagnetic actuator driving device may be detected and a large current may be output from the constant current circuit when the magnitude is large. When the intensity of vibration of the electromagnetic actuator driving device is large, the electromagnetic actuator 14 may malfunction due to unnecessary movement of the plunger of the electromagnetic actuator 14 due to the vibration. According to the above configuration, it is possible to suppress a malfunction of the electromagnetic actuator 14 by supplying a relatively large current to the solenoid coil 14a at that time.

  In each embodiment, the full wave rectifier circuit 15 and the smoothing capacitor 16 may be omitted. When the electromagnetic actuator driving device having such a configuration is connected to an AC power source, a full-wave rectifying circuit and a smoothing capacitor are separately prepared, and the electromagnetic actuator driving device and the AC power source are connected via the full-wave rectifying circuit and the smoothing capacitor. Should be connected to each other.

In each embodiment, the constant current circuit may be omitted.
In each embodiment, instead of the switch circuit 31, any configuration such as an electromagnetic relay may be provided as long as the energized state and the de-energized state of the solenoid coil 14a can be switched. .

  In each embodiment, the configuration of the constant voltage circuit 17 can be arbitrarily changed as long as the input voltage can be converted into a constant voltage and output. The switching type constant voltage circuit is not limited to the linear type constant voltage circuit.

  DESCRIPTION OF SYMBOLS 10 ... Base part, 10a ... Surface, 10b ... Valve body, 11 ... Power supply terminal, 11a ... Power supply [+] terminal, 11b ... Power supply [-] terminal, 12 ... Input terminal, 13 ... Programmable logic controller (PLC) , 14 ... Electromagnetic actuator, 14a ... Solenoid coil, 15 ... Full wave rectifier circuit, 15a ... Diode, 16 ... Smoothing capacitor, 17 ... Constant voltage circuit, 18 ... Switching IC, 19 ... Transformer, 19a ... Input side coil, 19b ... Output side coil, 20 ... Field effect transistor (FET), 21 ... Resistor, 22 ... Output terminal, 22a ... Output [+] terminal, 22b ... Output [-] terminal, 23 ... Voltage stabilization circuit, 24 ... min Voltage circuit 25 ... Zener diode 26 ... Photo coupler 27 ... Light emitting diode 28 ... Resistor 29 ... Smoothing capacitor 30 ... Constant Current circuit, 31 ... switch circuit, 31a ... photocoupler, 31b ... transistor, 31c, 31d, 31e ... resistor, 32 ... diode, 33,34 ... transistor, 35,36 ... resistor, 40 ... constant current circuit, 41 ... change circuit, 42 ... transistor, 43 ... microcomputer, 44 ... resistor, 50 ... constant current circuit, 51 ... FET, 52 ... resistor, 60 ... constant current circuit, 61 ... three-terminal regulator, 70 ... constant current circuit 71 ... FET, 72 ... resistor, 73 ... transistor, 74 ... resistor, 80 ... constant current circuit, 81 ... capacitor.

Claims (5)

A plurality of electromagnetic actuators having a solenoid coil for driving, and an electromagnetic actuator driving device for driving these electromagnetic actuators,
A constant voltage circuit that converts an input voltage within a predetermined range to a constant voltage and outputs the voltage, and applies the output voltage to solenoid coils of the plurality of electromagnetic actuators connected in parallel;
The electromagnetic actuator driving device, wherein the plurality of electromagnetic actuators and the constant voltage circuit are formed as one unit integrally attached. The electromagnetic actuator driving device according to claim 1,
The constant voltage circuit and the solenoid coil are connected via a constant current circuit that converts an input current into a constant current and outputs the current.
The said constant current circuit is provided corresponding to each of these electromagnetic actuators, and is contained in the said unit, The electromagnetic actuator drive device characterized by the above-mentioned. The electromagnetic actuator driving device according to claim 2,
An electromagnetic actuator driving apparatus comprising: a changing circuit for changing a current output from the constant current circuit, the changing circuit being included in the unit. In the electromagnetic actuator drive device according to any one of claims 1 to 3,
The electromagnetic actuator driving apparatus, wherein the constant voltage circuit is a switching type constant voltage circuit that converts the input voltage through a switching operation of a semiconductor element. In the electromagnetic actuator drive device according to any one of claims 1 to 4,
The constant voltage circuit and the solenoid coil are connected via a switch circuit that switches between an energized state and a non-energized state of the solenoid coil,
The switch circuit is provided corresponding to each of the plurality of electromagnetic actuators, and is included in the unit.

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