JP2014105722A - Solenoid valve drive control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve drive control device in which a shading coil (a shading ring) is not necessary for a sucking element or a plunger, a surplus winding of a solenoid coil for a solenoid is not needed, the number of members and the number of steps of processing are decreased and its cost can be reduced.SOLUTION: A solenoid valve drive control device is constituted such that in an opening valve drive period (A) where a valve body is opened, after DC high voltage (Va) is applied to a solenoid, a DC low voltage (Vb) is applied in a holding period (B) where the valve opened state is held, when a voltage supplied to the solenoid is changed over from the opening valve drive period (A) to the holding period (B), there is provided voltage decreasing means for reducing a voltage in a specific gradient from the DC high voltage (Va) to the DC low voltage (Vb).

Description

  The present invention relates to a solenoid valve drive control device, and more specifically, for example, full-wave rectification of an alternating current from an alternating current power source is converted into a direct current, and this direct current is passed through a solenoid (electromagnetic coil). The electromagnetic valve drive control device for the electromagnetic valve is configured such that the plunger is moved by the movement of the valve body so that the valve body provided on the plunger is moved away from the valve seat to open and close the valve body.

  Conventionally, for example, a general electromagnetic valve is configured as shown in FIG.

  That is, as shown in FIG. 9, the electromagnetic valve 100 includes a control unit 104 including a valve body 102.

  Moreover, the control part 104 of this electromagnetic valve 100 is provided with the electromagnetic coil 108 by which the drive part 106 was penetrated, as shown in FIG.

  The electromagnetic coil 108 is molded with a mold resin 112 so as to surround the bobbin 120 around which the winding is wound and the bobbin 120. Furthermore, as shown in FIG. 9, the electromagnetic coil 108 is mounted inside the magnetic frame 114 and is fixed to the drive unit 106 via the magnetic frame 114.

  That is, the drive unit 106 is inserted through the drive unit insertion hole 118 formed at the center of the bottom plate portion 116 of the magnetic frame 114 and the drive unit insertion hole 122 of the bobbin 120. Then, the fastening bolt 132 is screwed into the bolt insertion hole 126 formed in the upper portion of the attractor 124 of the driving unit 106 via the bolt insertion hole 130 formed in the center portion of the upper plate portion 128 of the magnetic frame 114. Has been.

  Thereby, the electromagnetic coil 108 is inserted and fixed to the drive part 106, and the control part 104 of the electromagnetic valve 100 is comprised.

  The drive unit 106 includes a plunger case 134 and includes a plunger 136 in which the valve body 102 that can move up and down is fixed. A biasing spring 140 that biases the plunger 136 downward, that is, in the direction of the valve seat 138 is interposed between the suction element 124 and the plunger 136.

  In such an electromagnetic valve 100, when the electromagnetic coil 108 is energized, the plunger 136 moves in the direction of the attractor 124 against the biasing spring 140, and the valve body 102 connected to the plunger 136 is The valve port 142 is opened away from the valve seat 138.

  Further, by shutting off the energization to the electromagnetic coil 108, the plunger 136 moves away from the attractor 124 by the biasing force of the biasing spring 140, and the valve body 102 connected to the plunger 136 is moved. The valve port 142 is closed by contacting the valve seat 138.

  Further, when an alternating current is applied to the electromagnetic coil 108, an eddy current is generated, so that the plunger 136 moves in the direction of the attracting element 124 against the biasing spring 140 and attracts the plunger 136. The state where the child 124 abuts, that is, the state where the valve body 102 is separated from the valve seat 138 and the valve port 142 is opened is maintained.

  In order to generate an eddy current, an annular scraping coil (sparing ring) 148 is conventionally mounted in an annular coil mounting groove 146 formed on the lower end surface 144 facing the plunger of the attractor 124 and the plunger 136. Things have been done.

  Here, since the power consumption of the electromagnetic coil 108 used for driving the electromagnetic valve 100 differs depending on the power supply voltage, it is necessary to prepare it with a winding specification that does not exceed the allowable temperature rise limit of the electromagnetic coil 108.

  That is, since the plunger 136 cannot be attracted only by generating an alternating magnetic field in the electromagnetic coil 108, the scraping coil 148 is embedded in the attractor 124 (or the plunger 136 side) to generate an eddy current to generate the attractor 124. The structure that pulls up in the direction of is adopted.

Japanese Patent No. 3777265 Japanese Patent No. 4911847

  By the way, in the conventional solenoid valve 100 configured in this way, the power factor is deteriorated by inserting the coiling coil 148, and a predetermined attractive force can be obtained by the temperature rise of the electromagnetic coil 108 due to energization. Therefore, it is necessary to wind the winding of the electromagnetic coil 108 in excess, which increases the number of members and processing man-hours, which increases the cost.

  Further, in the conventional solenoid valve 100, it is necessary to continue to energize the electromagnetic coil 108 after the plunger 136 is attracted in the direction of the attracting element 124, so that it is a fact that wasteful power is consumed.

  By the way, in patent document 1 (patent 3777265 gazette), in order to adsorb | suck and hold | maintain the plunger integral with a valve body to a core, it is an electromagnetic valve which controls the electric current sent through a coil, Comprising: There has been proposed a solenoid valve that increases the force and reduces the unnecessary current consumption by reducing the current flowing for adsorbing and holding.

  Therefore, in the electromagnetic valve drive control device 200 of this Patent Document 1, as shown in the block diagram of FIG. 10, a full-wave rectifier circuit unit 202 that converts AC power into DC power and a full-wave rectifier circuit unit 202 A power supply smoothing unit 204 that extracts and smoothes a voltage of a certain value or more from a DC power supply voltage, a comparison calculation unit 208 that controls energization / energization of a solenoid (electromagnetic coil) 206, and a comparison calculation unit 208 A drive element unit 210 for energizing / interrupting energization of the electromagnetic coil 206 is provided.

  Further, an attracting current instruction unit 212 that instructs the energization time to the comparison operation unit 208 so that a current about twice the minimum holding current necessary for attracting the plunger to the core (attractor) flows in the electromagnetic coil 206. And an adsorption holding current instruction unit 214 for instructing the comparison calculation unit 208 about the time of energization / energization of the electromagnetic coil 206 so that a current necessary for adsorption holding of the plunger and the core flows to the electromagnetic coil 206; It has.

  That is, the direct current power source by the full-wave rectifier circuit unit 202 causes a current necessary for attracting the plunger to the core to the electromagnetic coil 206, and the plunger is attracted to the excited core.

  Based on the output from the comparison calculation unit 208, the energization / energization of the electromagnetic coil 206 by the drive element unit 210 is controlled, and a current about twice the minimum holding current necessary for suction holding flows. Is held by suction.

  At this time, the energization time for flowing the current required for the first adsorption to the electromagnetic coil 206 is determined by the adsorption current instruction unit 212. Further, the time for energizing / cutting off the current necessary for the adsorption holding after the adsorption to the electromagnetic coil 206 is determined by the adsorption holding current instruction unit 214.

  As a result, the energization current to the electromagnetic coil 206 can be increased to the maximum, and when the plunger is attracted and held by the core, the current flowing through the electromagnetic coil 206 is reduced to reduce unnecessary power consumption. It can be done.

  However, the electromagnetic valve drive control device 200 of Patent Document 1 has a configuration in which a core (suction element) is provided with a scissor coil (scoring ring) as shown in the drawing. For this reason, since the power factor is deteriorated by inserting the scraping coil, and a predetermined attraction force cannot be obtained due to the temperature rise of the electromagnetic coil due to energization, it is necessary to wind an extra winding of the electromagnetic coil. Yes, it becomes a factor to increase the cost.

  Further, in the electromagnetic valve drive control device 200 of Patent Document 1, after the plunger is attracted in the direction of the attractor, it is necessary to continue energizing the minimum holding current to the electromagnetic coil, and thus wasteful power is consumed. .

  On the other hand, Patent Document 2 (Japanese Patent No. 4911847) discloses an air conditioner including an electromagnetic valve control device.

  That is, as shown in the block diagram of FIG. 11, the electromagnetic valve control device 300 of Patent Document 2 includes a positive characteristic temperature coefficient element 304 connected to the valve coil 302 of the four-way switching electromagnetic valve, and a positive characteristic temperature coefficient element 304. The relay 306 is provided as a first switch means connected to.

  Further, a diode D1 having a cathode connected to the valve coil 302 and a transistor Q1 as a second switch means having a collector connected to the anode of the diode D1 are provided.

  Further, a control unit 308 that outputs a control signal to the relay 306 and outputs a control signal to the base of the transistor Q1 via the resistor R1 is provided.

  Further, the other end of the relay 306 is applied with a high DC voltage (DC 280 V) from the inverter power supply 310 for the inverter circuit that drives the compressor of the air conditioner, and the air conditioner is connected to the emitter of the transistor Q1. A low DC voltage (DC 16 V) is applied from the control power supply unit 312 of the inverter circuit.

  As a result, by switching the relay 306 as the first switch means and the transistor Q1 as the second switch means, a DC high voltage (DC 280 V) is supplied from the inverter power supply unit 310 for driving the compressor of the air conditioner. In addition, since a direct current low voltage (DC16V) is supplied from the control power supply unit 312 of the air conditioner, it is not necessary to prepare a separate solenoid valve drive power supply, and the cost can be reduced. .

  However, this configuration requires an inverter power supply unit 310 and an air conditioner control power supply unit 312 for driving the compressor of the air conditioner, and can only be used in an air conditioner. Therefore, it cannot be used for other purposes.

  In this case as well, after the plunger is attracted in the direction of the attractor, it is necessary to continue energizing the electromagnetic coil with the minimum holding current, and wasteful power is consumed.

  Therefore, the object of the present invention is that no scraping coil (scraping ring) is required on the attractor or plunger, and it is not necessary to wind an extra winding of the solenoid electromagnetic coil, reducing the number of members and processing steps, and reducing the cost. An object of the present invention is to provide an electromagnetic valve drive control device that can be reduced.

  In the present invention, after the plunger is attracted in the direction of the attractor, it is necessary to continue energizing the electromagnetic coil with the minimum holding current, but the current is extremely low, and wasteful power is not consumed. Moreover, it is an object of the present invention to provide an electromagnetic valve drive control device that does not cause a phenomenon that the plunger is detached.

The present invention has been invented in order to achieve the above-described problems and objects in the prior art, and the electromagnetic valve drive control device of the present invention includes:
Solenoid valve drive of a solenoid valve configured to open and close the valve body by moving the plunger by energizing the solenoid with a direct current, and the valve body provided on the plunger moves away from and in contact with the valve seat A control device,
The solenoid valve is not provided with a coiling coil on either the attractor or the plunger,
In the valve opening drive period (A) for opening the valve body, after applying a DC high voltage (Va) to the solenoid, in the holding period (B) for holding the valve open state, the DC low voltage ( Vb) is applied, and
A voltage that decreases the voltage with a constant gradient from the DC high voltage (Va) to the DC low voltage (Vb) when the supply voltage to the solenoid is switched from the valve opening drive period (A) to the holding period (B). The lowering means is provided.

  With this configuration, since the solenoid valve is not provided with a scraping coil in either the attractor or the plunger, even if the magnetic flux necessary for attracting the plunger is the same, the scraping coil is eliminated. As a result, the magnetic resistance of the plunger is lowered and approaches to direct current drive, so that the apparent inductance is reduced, so that the coil size can be reduced.

  Therefore, there is no need for a coiling coil (scraping ring) on the attractor or plunger, and there is no need to wind an extra winding of the solenoid's electromagnetic coil, reducing the number of members and processing man-hours and reducing costs. is there.

  Further, when the voltage drop means switches the supply voltage to the solenoid from the valve opening drive period (A) to the holding period (B), the voltage is increased from the DC high voltage (Va) to the DC low voltage (Vb). Since the pressure decreases at a constant gradient, it is necessary to continue energizing the electromagnetic coil with the minimum holding current after attracting the plunger in the direction of the attractor. However, the current is extremely low, and wasteful power is not consumed. Moreover, the phenomenon that the plunger comes off does not occur.

  Further, in the solenoid valve drive control device of the present invention, the voltage drop means applies two kinds of voltages to the Ref terminal input voltage using a PWM (Pulse Width Modulation) type constant current control circuit, and the DC high voltage When changing from (Va) to DC low voltage (Vb), the voltage is decreased at a constant gradient.

  In this way, when two kinds of voltages are applied to the Ref terminal input voltage and the voltage is changed from the DC high voltage (Va) to the DC low voltage (Vb), the voltage is decreased with a constant gradient, so the DC high voltage (Va). The holding current is stabilized when switching from DC to DC low voltage (Vb). Further, when the inductance of the solenoid is increased, the current for holding the plunger becomes unstable and the plunger is easily detached, but the present invention can effectively prevent this phenomenon.

  The electromagnetic valve drive control device according to the present invention is characterized in that the voltage drop means is configured by connecting a capacitor in parallel to a reference potential generating resistor for generating two modes.

  In this way, when the DC high voltage (Va) is changed to the DC low voltage (Vb) by connecting the capacitor in parallel to the reference potential generating resistor for generating the two modes, the voltage is exponentially constant with a constant gradient. Therefore, when the inductance is increased, it is possible to more effectively prevent the phenomenon that the current holding the plunger becomes unstable and the plunger is easily detached.

The electromagnetic valve drive control device of the present invention is
A full-wave rectifying / smoothing circuit for full-wave rectifying an alternating current from an alternating-current power source, converting the direct-current to a direct current, and passing the converted direct current through a solenoid;
A comparison operation unit for controlling energization / energization of the solenoid;
A drive element unit for energizing / interrupting energization of the solenoid; a drive current detection unit for detecting a drive current of the drive element unit and feeding back to the comparison calculation unit;
It is characterized by providing.

  By configuring in this way, the AC power supply can be full-wave rectified by a full-wave rectifying and smoothing circuit consisting of a diode bridge, generating a direct current, eliminating the coiling coil, and extra solenoid coil windings. There is no need to wind, and the number of members and processing man-hours can be reduced, thereby reducing the cost.

  Also, even if the magnetic flux required to attract the plunger is the same, eliminating the coiling coil reduces the plunger's magnetic resistance and approaches direct current drive, reducing the apparent inductance, thus reducing the coil size. be able to.

  Therefore, there is no need for a coiling coil (scraping ring) on the attractor or plunger, and there is no need to wind an extra winding of the solenoid's electromagnetic coil, reducing the number of members and processing man-hours and reducing costs. is there.

  For example, when 100% energization is performed for a time of 30 mS or more, the plunger can be sucked, and thereafter, the minimum value of the current flowing in the coil is set to about 1/10 of the value of 100% energization. Since the possible current limiting circuit is configured, the plunger can be kept in the suctioned state, the current is extremely low, and useless power is not consumed.

  In addition, since there is a current limiting circuit, even if 240V is applied to a 100V coil, coil burning due to temperature rise does not occur, so there is no need to prepare a coil for each power supply voltage, and the coil lineup can be reduced. In addition, the insulation class can be lowered and the material cost can be reduced.

  The solenoid valve drive control device of the present invention is characterized in that a current recirculation member that recirculates to the solenoid when the energization is interrupted is connected to the solenoid.

  With this configuration, for example, by using a flywheel diode as a current return member, energy can be passed through a solenoid (electromagnetic coil) during a period in which energization is interrupted, so that the plunger does not vibrate. .

  The electromagnetic valve drive control device according to the present invention is characterized in that the voltage drop means is constituted by a suction timing waveform generator.

  Thus, the voltage reduction means can be constituted by a suction timing waveform generator, and a rectangular transmitter capable of adjusting the duty ratio can be used as such a suction timing waveform generator. As an example of the transmitter, “one-shot multivibrator described in FIG. 3” or “free-run transmitter using timer IC: 555” can be used.

  Also, the solenoid valve drive control device of the present invention is configured such that the voltage reduction means generates a waveform by combining a microcomputer or a digital signal processor (DSP) and a D / A converter. You can also.

  Further, the electromagnetic valve drive control device of the present invention is characterized in that the voltage drop means is constituted by a triangular wave generator using an operational amplifier (OPAmp).

  As described above, the voltage drop means may be constituted by a triangular wave generator using an operational amplifier (OPAmp).

  According to the present invention, since the solenoid valve is not provided with a scraping coil in either the attractor or the plunger, even if the magnetic flux necessary for attracting the plunger is the same, by eliminating the scraping coil, Since the magnetic resistance of the plunger decreases and approaches the direct current drive, the apparent inductance is reduced, so that the coil size can be reduced.

  Therefore, there is no need for a coiling coil (scraping ring) on the attractor or plunger, and there is no need to wind an extra winding of the solenoid's electromagnetic coil, reducing the number of members and processing man-hours and reducing costs. is there.

  Further, when the voltage drop means switches the supply voltage to the solenoid from the valve opening drive period (A) to the holding period (B), the voltage is increased from the DC high voltage (Va) to the DC low voltage (Vb). Since the pressure decreases at a constant gradient, it is necessary to continue energizing the electromagnetic coil with the minimum holding current after attracting the plunger in the direction of the attractor. However, the current is extremely low, and wasteful power is not consumed. Moreover, the phenomenon that the plunger is detached does not occur.

FIG. 1 is a longitudinal sectional view of a solenoid valve to which a solenoid valve drive control device of the present invention is applied. FIG. 2 is a block diagram showing an electromagnetic valve drive control device of the present invention. FIG. 3 is a circuit diagram of the electromagnetic valve drive control device of the present invention. FIG. 4 is a circuit diagram schematically showing a part of the circuit of FIG. FIG. 5 is a graph showing the voltage change of the current of the solenoid valve drive control device of the present invention. FIG. 6 is a graph showing current and voltage changes of the solenoid valve drive control device of the present invention. FIG. 7 is an enlarged graph of a portion C in FIG. FIG. 8 is a graph showing current and voltage changes of the solenoid valve drive control device of the present invention. FIG. 9 is a longitudinal sectional view of a conventional solenoid valve. FIG. 10 is a block diagram of a conventional solenoid valve drive control device 200. FIG. 11 is a block diagram of a conventional solenoid valve control device 300.

  Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.

  1 is a longitudinal sectional view of a solenoid valve to which the solenoid valve drive control device of the present invention is applied, FIG. 2 is a block diagram showing the solenoid valve drive control device of the present invention, and FIG. 3 is a solenoid valve drive control of the present invention. FIG. 4 is a circuit diagram schematically showing a part of the circuit of FIG. 3, and FIG. 5 is a graph showing the voltage change of the current of the electromagnetic valve drive control device of the present invention.

  In FIG. 1, the code | symbol 10 has shown the solenoid valve to which the solenoid valve drive control apparatus of this invention is applied as a whole.

  As shown in FIG. 1, the electromagnetic valve 10 includes a control unit 14 including a valve body 12.

  Moreover, the control part 14 of this electromagnetic valve 10 is provided with the electromagnetic coil 18 by which the drive part 16 was penetrated, as shown in FIG.

  The electromagnetic coil 18 is molded with a mold resin 22 so as to surround the bobbin 30 around which the winding is wound and the bobbin 30. Further, as shown in FIG. 9, the electromagnetic coil 18 is mounted inside the magnetic frame 24 and is fixed to the drive unit 16 via the magnetic frame 24.

  That is, the drive unit 16 is inserted into the drive unit insertion hole 28 formed in the center portion of the bottom plate portion 26 of the magnetic frame 24 and the drive unit insertion hole 32 of the bobbin 30. Then, the fastening bolt 42 is screwed into the bolt insertion hole 36 formed in the upper portion of the attractor 34 of the drive unit 16 via the bolt insertion hole 40 formed in the center portion of the upper plate portion 38 of the magnetic frame 24. Has been.

  Thereby, the electromagnetic coil 18 is inserted and fixed to the drive part 16, and the control part 14 of the electromagnetic valve 10 is comprised.

  The drive unit 16 includes a plunger case 44 and includes a plunger 46 in which the valve body 12 that can move up and down is fixed. A biasing spring 50 that biases the plunger 46 downward, that is, in the direction of the valve seat 48 is interposed between the suction element 34 and the plunger 46.

  In such an electromagnetic valve 10, when the electromagnetic coil 18 is energized, the plunger 46 moves in the direction of the attractor 34 against the biasing spring 50, and the valve body 12 connected to the plunger 46 is The valve port 52 is opened away from the valve seat 48.

  Further, by shutting off the energization to the electromagnetic coil 18, the plunger 46 is moved away from the attractor 34 by the biasing force of the biasing spring 50, and the valve body 12 connected to the plunger 46 is moved. The valve port 52 is closed by contacting the valve seat 48.

  Further, in the conventional solenoid valve 100 shown in FIG. 9, the attractor 124 is provided with the annular scraping coil (scraping ring) 148. However, as shown in FIG. 1, the solenoid valve drive control device of the present invention is provided. The electromagnetic valve 10 to which the above is applied has a structure in which neither the attracting element 34 nor the plunger 46 is provided with such a scoring coil (scoring ring).

  FIG. 2 is a block diagram showing an electromagnetic valve drive control device 60 of the present invention. In this embodiment, as an example, an embodiment for controlling the drive of the electromagnetic valve 10 having such a configuration using an AC power source is shown. Show.

  The electromagnetic valve drive control device 60 of the present invention can be used with either an AC power source or a DC power source. In the case of a DC power source, a full-wave rectifying / smoothing circuit 64 described later may be omitted.

  The electromagnetic valve drive control device 60 of this embodiment includes, for example, an AC power source 62 composed of a commercial 100V single-phase AC power source, and the AC current from the AC power source 62 is a full-wave rectifying and smoothing composed of a diode bridge. The circuit 64 performs full-wave rectification and generates a direct current.

  As shown in FIG. 2, the alternating current from the full-wave rectifying / smoothing circuit 64 is energized to the solenoid 66 (electromagnetic coil 18) of the electromagnetic valve 10 to drive the solenoid 66. As a result, the plunger 46 moves in the direction of the suction element 34 against the biasing spring 50, the valve body 12 connected to the plunger 46 is separated from the valve seat 48, and the valve port 52 is opened. It has become so.

  In this case, full-wave rectification is performed by the full-wave rectifying / smoothing circuit 64 in this way and converted into a direct current, so that the solenoid valve 10 needs to be provided with a scraping coil in either the attractor 34 or the plunger 46. Therefore, even if the magnetic flux required to attract the plunger 46 is the same, the winding of the electromagnetic coil 18 of the solenoid 66 does not need to be wound extra by eliminating the coiling coil, reducing the number of members and processing man-hours. It is possible to reduce the cost.

  Further, even if the magnetic flux required to attract the plunger 46 is the same, the magnetic resistance of the plunger 46 is lowered by eliminating the coiling coil and approaches to DC driving, so that the apparent inductance is reduced. The coil size of 18 can be reduced.

  Further, in the electromagnetic valve drive control device 60 of this embodiment, as shown in FIG. 2, a flywheel diode 68, which is a current return member that returns to the solenoid 66 when the energization is interrupted, is connected to the solenoid 66.

  With this configuration, for example, by using the flywheel diode 68 as a current return member, energy can be passed through the solenoid 66 (electromagnetic coil 18) during a period of time when the energization is cut off, so that the plunger vibrates. There is nothing.

  Further, as shown in FIG. 2, the solenoid valve drive control device 60 includes a comparison calculation unit 70 that controls energization / energization of the solenoid 66 and energization of the solenoid 66. A drive element unit 72 that cuts off current is provided.

  Further, the solenoid valve drive control device 60 includes a drive current detection unit 74 that detects the drive current of the drive element unit 72 and feeds it back to the comparison calculation unit 70.

  With this configuration, the energization / energization of the electromagnetic coil 18 by the drive element unit 72 is controlled based on the output from the comparison calculation unit 70, and the energization is interrupted, so that the minimum required for adsorption holding is performed. Adsorption holding is performed by passing a holding current.

  On the other hand, as shown in FIG. 2, the electromagnetic valve drive control device 60 includes a suction timing generation circuit 76, and the suction timing generation circuit 76 has a rectangular wave as shown in the graph of FIG. 5 (1). This voltage is generated.

  Specifically, as shown in the graph of FIG. 5 (1) (the voltage at the position (1) in FIG. 2), in the valve opening drive period (A) for opening the valve body 12, direct current is applied. After applying the high voltage (Va) to the solenoid 66, the timing is generated so that the DC low voltage (Vb) is applied in the holding period (B) for holding the valve open state. It has become.

  For example, as shown in the graph of FIG. 5 (1), after applying a DC high voltage (Va) to the solenoid 66 in the valve opening drive period (A) for opening the valve body 12 for 30 ms. The timing is generated so that the DC low voltage (Vb) is applied in the time of 1S which is the holding period (B) for holding the valve open state.

  Further, as shown in FIG. 2, the solenoid valve drive control device 60 includes a PWM (Pulse Width Modulation) type constant current control circuit 78 for performing so-called duty control, and a suction timing generation circuit 76 and a comparison operation unit. 70.

  That is, the PWM type constant current control circuit 78 is used to apply two kinds of voltages to the Ref terminal input voltage to change from a DC high voltage (Va) to a DC low voltage (Vb).

  By the way, as shown in the graph of FIG. 5A, when switching from the valve opening drive period (A) to the holding period (B), that is, switching from the DC high voltage (Va) to the DC low voltage (Vb). When the inductance of the electromagnetic coil 18 is large in the period (C) immediately after switching, for example, 30 ms, the drive current detection unit is caused by the residual magnetic flux of the electromagnetic coil 18 in the process of suddenly shifting to the holding voltage. Before the electric potential of the resistor R5, which is 74, is raised and the electromagnetic coil 18 is energized, there is a period in which the state shifts to the cutoff mode.

  That is, this state may continue even if the current is less than the release current of the plunger 46, the current holding the plunger 46 becomes unstable, and a phenomenon that the plunger 46 is released may occur. .

  Therefore, in the electromagnetic valve drive control device 60 of the present invention, as shown in the graph of FIG. 5 (2), the supply voltage to the solenoid 66 is switched from the valve opening drive period (A) to the holding period (B). In this case, voltage lowering means is provided for reducing the voltage with a constant gradient (in this embodiment, exponentially) from the DC high voltage (Va) to the DC low voltage (Vb).

  The graph of FIG. 5B is a graph showing the voltage of the path from the PWM (Pulse Width Modulation) type constant current control circuit 78 to the comparison operation unit 70.

  Specifically, as shown in FIG. 2, the voltage lowering means is configured by connecting a capacitor C4 in parallel to a reference potential generating resistor R3 that generates two modes.

  As described above, when the capacitor C4 is connected in parallel to the reference potential generating resistor R3 for generating the two modes, the constant gradient is exponentially used when the DC high voltage (Va) is changed to the DC low voltage (Vb). Therefore, since the inductance is large, the current for holding the plunger 46 becomes unstable and can be more effectively prevented from being separated.

  Further, when the supply voltage to the solenoid 66 is switched from the valve opening drive period (A) to the holding period (B) by the voltage lowering means, the voltage decreases from the DC high voltage (Va) to the DC low voltage (Vb). Therefore, after the plunger 46 is attracted in the direction of the attracting element 34, it is necessary to continue energizing the minimum holding current to the electromagnetic coil 18, but the current is extremely low and wastes electric power. In addition, there is no occurrence of a phenomenon that the plunger is disengaged.

  That is, as shown in the graph of FIG. 5 (2), in the valve opening drive period (A), for example, when 100% energization is performed in a time of 30 mS or more, the plunger 46 can be sucked, and thereafter the coil 46 Since the current limiting circuit is configured such that the minimum value of the current flowing in the inside is about 1/10 of the value of 100% energization (in this embodiment, 10%), the plunger 46 is attracted. The current is extremely low and no wasteful power is consumed.

  In addition, since there is a current limiting circuit, even if 240V is applied to a 100V coil, coil burning due to temperature rise does not occur, so there is no need to prepare a coil for each power supply voltage, and the coil lineup can be reduced. In addition, the insulation class can be lowered and the material cost can be reduced.

  The electromagnetic valve drive control device 60 configured as described above is configured as a circuit diagram as shown in FIGS. 3 and 4, for example.

  That is, in FIG. 3, a portion A surrounded by a dotted line shows a full-wave rectifying / smoothing circuit 64, and this full-wave rectifying / smoothing circuit 64 is connected to an AC power supply 62 and is composed of four diodes. A diode bridge 80 is provided.

  A smoothing circuit 84 is connected to the diode bridge 80 between the power supply line 82 and the ground line G. The smoothing circuit 84 includes a diode D3 and a smoothing capacitor C11 connected in series to the diode D3.

  The power line 82 from the full-wave rectifying / smoothing circuit 64 is connected to a solenoid 66 (electromagnetic coil 18). Thereby, the alternating current from the alternating current power supply 62 is converted into a direct current by the full-wave rectifying / smoothing circuit 64 and smoothed, and the solenoid 66 (the electromagnetic coil 18) is energized.

  The solenoid 66 (electromagnetic coil 18) is connected in parallel to the solenoid 66, a flywheel diode 68 (D1) which is a current return member that returns to the solenoid 66 when energization is interrupted.

  On the other hand, in FIG. 3, a portion B surrounded by a dotted line indicates the suction timing generation circuit 76. The suction timing generation circuit 76 includes two MOS elements 86 and 88 connected in parallel. The MOS element 86 is connected in parallel with a resistor R8 and a timing generation capacitor C7 connected to the resistor R8, and determines the period of the DC high voltage (Va).

  The MOS element 88 is connected in parallel with a resistor R9 and a timing generation capacitor C9 connected to the resistor R9, and determines the period of the DC low voltage (Vb). A resistor R10 is connected between the MOS element 86 and the MOS element 88, and the MOS element 86 is connected to the diode D2 of the suction timing generation circuit 76 through a connection line 90.

  In the MOS element configuration of the timing generation circuit 76, it is uncertain whether the DC high voltage (Va) or the DC low voltage (Vb) is started at the time of starting. Therefore, the timing generating circuit 76 is connected to the capacitors C6 and C8. The timing is adjusted by shifting the constants of the resistor R7 and the resistor R10 about 5 times.

  Further, the VSS of the MOS element 86 and the MOS element 88 is connected to the ground line G. Further, the start timing adjusting capacitors C6 and C8 and the timing generating capacitors C7 and C9 are also connected to the ground line G, respectively.

Further, the VDD, the resistance R8, and the resistance R9 of the MOS element 86 and the MOS element 88 are connected to a comparison operation unit (comparator) 70 through a capacitor C3 connected in parallel.
In addition, the other structure is shown only with the code | symbol of an electrical symbol in FIG. 3, and the detailed description is abbreviate | omitted.

With this configuration, the suction timing generation circuit 76 forms a timing generation circuit that oscillates a rectangular wave as shown in the graph of FIG.
The suction timing generation circuit uses two one-shot multivibrators and connects the inversion timing of the output signal to the input trigger circuit on the other side to constitute a ring oscillation circuit.

  On the other hand, in FIG. 3, a portion C surrounded by a dotted line indicates the PWM constant current control circuit 78. The PWM constant current control circuit 78 includes a Ref input terminal R connected via a resistor R4 and a diode D2 connected to the suction timing generation circuit 76 by a connection line 90. The Ref input terminal R is connected to one end of a resistor R 3, one end of a resistor R 6, and one end of a capacitor C 4, and is connected to a comparison operation unit (comparator) 70.

  Here, the reference potential generating resistor R3 for generating the two modes and the capacitor C4 are connected in parallel, and one end is connected to the comparison operation unit (comparator) 70 and the other end is connected to the ground line G. Yes. In addition, the other structure is shown only with the code | symbol of an electrical symbol in FIG. 3, and the detailed description is abbreviate | omitted.

  With this configuration, as described above, in the PWM constant current control circuit 78, as shown in the graph of FIG. 5B, the supply voltage to the solenoid 66 is changed to the valve opening drive period (A). When the voltage is switched from the holding period (B) to the holding period (B), a voltage lowering unit is formed that lowers the voltage from the DC high voltage (Va) to the DC low voltage (Vb) with a constant gradient (in this embodiment, exponentially). Has been.

  That is, the voltage lowering means is configured by connecting the capacitor C4 in parallel to the reference potential generating resistor R3 for generating the two modes as shown in FIG.

  Further, as shown in FIGS. 3 and 4, the resistor R <b> 5 constitutes the drive current detection unit 74.

  The circuit diagrams of FIGS. 3 and 4 are merely examples of the electromagnetic valve drive control device 60, and other circuits can of course be used.

  FIG. 6 shows that in the electromagnetic valve drive control device 60 configured as described above, Ch1: Sen resistance, Ch2: Ref voltage, the smoothing capacitor C11 of the full-wave rectification smoothing circuit 64 has 22 μF, and the Ref voltage is high. It is a graph which shows a case.

  6, (S) shows the supply current from the full-wave rectifying / smoothing circuit 64 to the solenoid 66 at the position (S) in FIG. 2, and is ON at the Aon point, that is, the plunger 46. Is sucked in the direction of the suction element 34 and the valve is opened.

  In FIG. 6, (2) shows the Ref voltage at the position (2) in FIG. 2 from the PWM constant current control circuit 78.

  Furthermore, in FIG. 6, (4) shows the voltage at the position (4) in FIG. 2 between the drive element unit 72 and the drive current detection unit 74.

  Moreover, the graph of FIG. 7 is the enlarged graph of the part C of FIG. 6, and is charging in the part D surrounded by a circle and is slowly discharging in the part E surrounded by a circle. .

  Therefore, as apparent from the circled portion B of the graph of FIG. 6 and the circled portion E of the graph of FIG. 7, the supply voltage to the solenoid 66 is changed from the valve opening drive period (A) to the holding period ( When switching to B), the voltage decreases with a constant gradient (exponentially in this embodiment) from the DC high voltage (Va) to the DC low voltage (Vb), and the plunger is detached. Therefore, the energization / energization cycle of the solenoid (electromagnetic coil) 66 is stable.

  FIG. 8 shows a case where the capacitor C4 of the PWM constant current control circuit 78 is 2.2 μF, and the Ref voltage is quickly reduced. As is apparent from the circled portion F in FIG. The plunger is detached and the energization / energization cycle to the solenoid (electromagnetic coil) 66 is unstable. In FIG. 8, a state where the oscillation frequency is increased is shown in a circled portion G.

  Accordingly, as apparent from FIGS. 6 to 8, the capacitor C4 of the PWM constant current control circuit 78 is provided, and the supply voltage to the solenoid 66 is changed from the valve opening drive period (A) to the holding period (B). In the case of FIG. 6, the voltage is decreased at a constant gradient (exponentially in this embodiment) from the DC high voltage (Va) to the DC low voltage (Vb). It is shown that there is.

In the above embodiment, the voltage reducing means is configured by connecting the capacitor C4 in parallel to the reference potential generating resistor R3 for generating the two modes as shown in FIG. As means for reducing the voltage from the DC high voltage (Va) to the DC low voltage (Vb) with a constant gradient when switching the supply voltage to 66 from the valve opening drive period (A) to the holding period (B). Although not shown, the following means can be used.
(1) A suction timing waveform generator is used.
(2) It is configured by generating a waveform by combining a microcomputer or a digital signal processor (DSP) and a D / A converter.
(3) A triangular wave generator using an operational amplifier (OPAmp) is used.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this. In the above embodiment, an embodiment using an AC power source as the electromagnetic valve drive control device 60 will be described. However, the solenoid valve drive control device 60 of the present invention can be used with either an AC power supply or a DC power supply. In the case of a DC power supply, the full-wave rectifying and smoothing circuit 64 described later may be omitted. .

  Further, in the above-described embodiment, the flywheel diode 68 is used as the current return member that returns to the solenoid 66 when the energization is interrupted. Various modifications can be made without departing from the object of the invention.

  The present invention can be used with an electromagnetic valve having a scraping coil (scoring ring) as long as the power factor is allowed to deteriorate.

  The present invention relates to an electromagnetic valve drive control device, and more specifically, for example, full-wave rectification of an alternating current from an alternating current power source is converted into a direct current, and a solenoid (electromagnetic coil) is energized by the direct current power source The solenoid can be applied to an electromagnetic valve drive control device for an electromagnetic valve configured to move the plunger by the above-described method so that the valve body provided on the plunger moves away from the valve seat and opens and closes the valve body. .

DESCRIPTION OF SYMBOLS 10 Solenoid valve 12 Valve body 14 Control part 16 Drive part 18 Electromagnetic coil 22 Mold resin 24 Magnetic frame 26 Bottom plate part 28 Drive part insertion hole 30 Bobbin 32 Drive part insertion hole 34 Attractor 36 Bolt insertion hole 38 Upper plate part 40 Bolt insertion Hole 42 Fastening bolt 44 Plunger case 46 Plunger 48 Valve seat 50 Energizing spring 52 Valve port 60 Solenoid valve drive control device 62 AC power supply 64 Full-wave rectification smoothing circuit 66 Solenoid 68 Flywheel diode 70 Comparison calculation unit 72 Drive element unit 74 Drive current detection unit 76 Suction timing generation circuit 78 PWM constant current control circuit 80 Diode bridge 82 Power line 86 MOS element 88 MOS element 90 Connection line 100 Solenoid valve 102 Valve element 104 Control unit 106 Driving unit 108 Electromagnetic coil 112 Mold resin 114 Magnetic frame 116 Plate portion 118 Drive portion insertion hole 120 Bobbin 122 Drive portion insertion hole 124 Aspirator 126 Bolt insertion hole 128 Upper plate portion 130 Bolt insertion hole 132 Fastening bolt 134 Plunger case 136 Plunger 138 Valve seat 140 Energizing spring 142 Valve port 144 Lower end surface 146 Scrape coil mounting groove 148 Scrape coil 200 Electromagnetic valve drive controller 202 Full-wave rectifier circuit unit 204 Power supply smoothing unit 206 Electromagnetic coil 208 Comparison operation unit 210 Drive element unit 212 Adsorption current instruction unit 214 Adsorption current instruction unit 300 Solenoid valve control device 302 Valve coil 304 Positive characteristic temperature coefficient element 306 Relay 308 Control unit 310 Inverter power supply unit 312 Control power supply unit

Claims (8)

Solenoid valve drive of a solenoid valve configured to open and close the valve body by moving the plunger by energizing the solenoid with a direct current, and the valve body provided on the plunger moves away from and in contact with the valve seat A control device,
The solenoid valve is not provided with a coiling coil on either the attractor or the plunger,
In the valve opening drive period (A) for opening the valve body, after applying a DC high voltage (Va) to the solenoid, in the holding period (B) for holding the valve open state, the DC low voltage ( Vb) is applied, and
A voltage that decreases the voltage with a constant gradient from the DC high voltage (Va) to the DC low voltage (Vb) when the supply voltage to the solenoid is switched from the valve opening drive period (A) to the holding period (B). An electromagnetic valve drive control device for an electromagnetic valve, characterized in that a lowering means is provided.   The voltage lowering means uses a PWM (Pulse Width Modulation) type constant current control circuit to apply two kinds of voltages to the Ref terminal input voltage, and changes from DC high voltage (Va) to DC low voltage (Vb). The electromagnetic valve drive control device according to claim 1, wherein the voltage is decreased at a constant gradient when performing the operation.   3. The electromagnetic valve drive control device according to claim 2, wherein the voltage drop means is configured by connecting a capacitor in parallel to a reference potential generating resistor for generating two modes. A full-wave rectifying / smoothing circuit for full-wave rectifying an alternating current from an alternating-current power source, converting the direct-current to a direct current, and passing the converted direct current through a solenoid;
A comparison operation unit for controlling energization / energization of the solenoid;
A drive element unit for energizing / interrupting energization of the solenoid; a drive current detection unit for detecting a drive current of the drive element unit and feeding back to the comparison calculation unit;
The electromagnetic valve drive control device according to any one of claims 2 to 3, further comprising:   The solenoid valve drive control device according to any one of claims 1 to 4, wherein a current recirculation member that recirculates to the solenoid when the energization is interrupted is connected to the solenoid.   The electromagnetic valve drive control device according to claim 1, wherein the voltage lowering unit is configured by a suction timing waveform generator.   2. The electromagnetic valve according to claim 1, wherein the voltage drop means is configured by generating a waveform by combining a microcomputer or a digital signal processor (DSP) and a D / A converter. Drive control device.   2. The electromagnetic valve drive control device according to claim 1, wherein the voltage drop means is constituted by a triangular wave generator using an operational amplifier (OPAmp).

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