JP5227066B2 - Solenoid valve drive control device - Google Patents

Description

  The present invention relates to an electromagnetic valve drive control device including two solenoids that drive an electromagnetic valve by rated energization and power saving energization.

This type of solenoid valve drive control device includes a first circuit in which a first solenoid and a first switching element are connected in series between a positive side and a negative side of a power source, a second solenoid, and a second solenoid. A second circuit that connects the switching elements in series is connected in parallel, and a third switching element is connected in series to the first circuit and the second circuit. Then, according to the drive command signal from the control circuit, either one of the first switching element and the second switching element is turned ON, and the third switching element is turned ON until the movement of the valve body is completed. A rated current is passed through the first solenoid or the second solenoid. When the movement of the valve element is completed, the third switching element is turned on / off at a predetermined cycle, and the current flowing through the first solenoid or the second solenoid is PWM controlled to reduce power consumption. In this way, two solenoids are driven and controlled by one control circuit.
Japanese Patent Laid-Open No. 2001-132866 (paragraphs 0037 to 0044, FIG. 4, FIG. 5, etc.)

  However, in such a conventional solenoid valve drive control device, the first switching element connected in series to the first solenoid, the second switching element connected in series to the second solenoid, and these connected in series. A third switching element is required. For this reason, there is a problem that three switching elements are required and the configuration becomes complicated.

  The subject of this invention is providing the solenoid valve drive control apparatus which can aim at the simplification of a structure by reducing the number of the switching elements to be used.

In order to achieve this problem, the present invention has taken the following measures. That is,
The valve body of the solenoid valve is moved by the driving force generated by the excitation of either the first solenoid or the second solenoid, and the application start point of application of the drive command signal to either the first solenoid or the second solenoid During the first period in which the movement of the valve body is completed, rated energization is performed based on the rated voltage to obtain a driving force sufficient to move the valve body, and the movement is completed over the second period after the first period has elapsed. was a valve body with an electromagnetic valve drive control device for holding the movement position performed saving power smaller than the rated current by PW M control, first of connecting the first solenoid and the first switching element in series A circuit, a second circuit in which a second solenoid and a second switching element are connected in series, and a first or second solenoid for rated energization of the first or second solenoid over a first period. Outputs an ON signal to the second switching element, ON / OFF the first or second switching element to perform the power-saving current by PW M control to the first or second solenoid for a second period and a control circuit for outputting a signal, the control circuit includes a first terminal connected to the positive side of the first circuit, a second terminal connected to the positive side of the second circuit, connected to the negative side of the first circuit And a fourth terminal connected to the negative side of the second circuit, the terminals are internally connected, and the first terminal and the control circuit are connected between the first terminal and the control circuit. A first diode that allows current flow to the inside and blocks current flow from the inside of the control circuit to the first terminal is provided, and the control circuit from the second terminal to the inside of the control circuit is provided between the second terminal and the inside of the control circuit. Allow current flow to the inside and from the control circuit to the second terminal A second diode for blocking current flow is provided , and current flow from the control circuit to the third terminal is allowed between the third terminal and the control circuit, and from the third terminal to the control circuit. A third diode for blocking current flow is provided, and current flow from the control circuit to the fourth terminal is allowed between the fourth terminal and the control circuit, and from the fourth terminal to the control circuit. A fourth diode for blocking current flow is provided, and the positive side of the first circuit and the positive side of the second circuit are connected to the positive side of the power source without being connected to each other. The negative side and the negative side of the second circuit are connected to each other and connected to the negative side of the power source, and the first side of the positive side of the first circuit and the positive side of the second circuit are connected to the positive side of the power source. circuit and the negative side common connection configuration in which a freely selected operating means energizing the second circuit, the first time The positive side of the second circuit and the positive side of the second circuit are connected to each other and connected to the positive side of the power source, and the negative side of the first circuit and the negative side of the second circuit are not connected to each other. Specially connected to the negative side, and an operating means is provided on the negative side of the first circuit and the negative side of the second circuit that are specially connected to the negative side of the power supply so that energization to the first circuit and the second circuit can be selected. The solenoid valve drive control device is characterized in that the positive side common connection configuration can be selected freely .

  The control circuit includes a timer circuit that sets the first period and an oscillation circuit that outputs an ON / OFF signal to the first or second switching element, and the timer circuit covers the first period over the first period. The output of the ON / OFF signal from the oscillation circuit may be disabled.

As described above in detail, the invention according to claim 1 has a negative-side common connection configuration, and when energization to the first circuit is selected by the selection means , from the positive side of the power source to the positive side of the first circuit. Since the current flows to the negative side of the power source through the negative side of the first circuit and the ON signal is output from the control circuit to the first switching element over the first period, the first solenoid is based on the rated voltage. performs a rated current, since for a second time period and outputs a first oN / OFF signal to the switching element from the control circuit performs a power-saving current by PW M control less than the rated current to the first solenoid. At this time, the current flowing from the first terminal connected to the positive side of the first circuit to the inside of the control circuit via the first diode is the second terminal connected to the positive side of the second circuit by the second diode. And the second solenoid is not energized.
In addition, when a negative side common connection configuration is selected and energization to the second circuit is selected by the selection means, the negative side of the power source is connected from the positive side of the power source to the positive side of the second circuit and the negative side of the second circuit. Current flows to the second switching element from the control circuit over the first period, so that the second solenoid is energized based on the rated voltage, and from the control circuit over the second period. since outputs the oN / OFF signals to the second switching element performs a power-saving current by PW M control less than the rated current to the second solenoid. At this time, the current flowing from the second terminal connected to the positive side of the second circuit to the inside of the control circuit via the second diode is the first terminal connected to the positive side of the first circuit by the first diode. The first solenoid is not energized.
For this reason, the negative side of the first circuit and the negative side of the second circuit are connected to each other and connected to the negative side of the power source, and the first side is connected to each other without being connected to the positive side of the power source. On the positive side of the circuit and the positive side of the second circuit, an operating means is provided so that energization to the first circuit and the second circuit can be freely selected to form a negative common connection configuration, and when the first solenoid is energized Since the second diode prevents the second solenoid from being energized, and when the second solenoid is energized, the first diode prevents the first solenoid from being energized. The first switching element connected in series to the solenoid and the second switching element connected in series to the second solenoid may be sufficient, and the number of switching elements to be used can be reduced and the configuration can be simplified. Can

Further, an invention according to claim 1, a positive side common connection configuration, if you choose the energization of the first circuit by the selection means, from the positive side of the power supply positive side of the first circuit, the first circuit A current flows to the negative side of the power source through the negative side, and an ON signal is output from the control circuit to the first switching element over the first period, so that the first solenoid is rated energized based on the rated voltage, since for a second period to output a first oN / OFF signal to the switching element from the control circuit performs a power-saving current by PW M control less than the rated current to the first solenoid. At this time, the fourth diode prevents current from flowing from the fourth terminal connected to the negative side of the second circuit into the control circuit, and the second solenoid is not energized.
Further, when the electrification of the second circuit is selected by the selection means with the positive side common connection configuration, the negative side of the power source is connected from the positive side of the power source to the positive side of the second circuit and the negative side of the second circuit. Current flows to the second switching element from the control circuit over the first period, so that the second solenoid is energized based on the rated voltage, and from the control circuit over the second period. since outputs the oN / OFF signals to the second switching element performs a power-saving current by PW M control less than the rated current to the second solenoid. At this time, the third diode prevents current from flowing from the third terminal connected to the negative side of the first circuit into the control circuit, and the first solenoid is not energized.
For this reason, the positive side of the first circuit and the positive side of the second circuit are connected to each other and connected to the positive side of the power source, and are connected to the negative side of the power source without being connected to each other. On the negative side of the circuit and the negative side of the second circuit, an operating means is provided so that energization to the first circuit and the second circuit can be freely selected to form a positive common connection configuration, and when the first solenoid is energized Since the fourth diode prevents the second solenoid from being energized, and when the second solenoid is energized, the third diode prevents the first solenoid from being energized. The first switching element connected in series to the solenoid and the second switching element connected in series to the second solenoid may be sufficient, and the number of switching elements to be used can be reduced and the configuration can be simplified. Can

In the first aspect of the invention , since the negative common connection configuration and the positive common connection configuration can be freely selected, the first circuit, the second circuit, and the control circuit provided in the electromagnetic valve driving device are shared. Can be applied to the negative side common connection configuration and the positive side common connection configuration, so that the electromagnetic valve driving device used for the negative side common connection configuration and the electromagnetic valve driving device used for the positive side common connection configuration are respectively distinguished. It is not necessary to prepare, and the number of types of solenoid valve driving devices can be reduced.

Further, in the invention described in claim 2 , in addition to the effect described in claim 1 , the first period set by the timer circuit can be set to an optimum value according to the specification of the valve.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a DC power source. Reference numeral 2 denotes a first circuit, which has its own positive side connected to the positive side of the power source 1 and its negative side connected to the negative side of the power source 1. The first circuit 2 connects a first solenoid 2A, a first switching element 2B, and a first protective diode 2C in series, and further connects the first light emitting element 2D and the first freewheeling diode 2E to the first solenoid. 2A is connected in parallel. The first solenoid 2A generates a driving force by excitation by energization, and moves the valve body of an electromagnetic valve (not shown) in one direction with this driving force. The first switching element 2B is a field effect transistor, which performs a switching operation in response to an ON signal or an ON / OFF signal received at the gate, and controls a current flowing through the first solenoid 2A. The first protective diode 2C is disposed so as to allow a current flow from the positive side to the negative side of the first circuit 2 and to block a current flow from the negative side to the positive side. When the positive side and the negative side of the power supply 1 are mistakenly connected to the positive side and the negative side of the power source 1, malfunction prevention due to energization of the first solenoid 2A and protection of the first switching element 2B are achieved. The first light emitting element 2D is a light emitting diode, which emits light when energized, and makes it possible to visually recognize that the first solenoid 2A is energized by light emission. The first free-wheeling diode 2E is arranged so as to allow a current flow from the negative side to the positive side of the first circuit 2 and to prevent a current flow from the positive side to the negative side, and immediately after the energization is cut off. The back electromotive force generated in step 1 is recirculated from the negative side to the positive side to prevent a surge voltage from being generated in the first solenoid 2A. 2F is a capacitor disposed between the gate and source of the first switching element 2B, and absorbs noise acting on the gate of the first switching element 2B. 2G is a first contact that is normally open and is arranged between the positive side of the power source 1 and the positive side of the first circuit 2 and is closed by an operation according to the drive command signal to close the positive side of the power source 1 and the first circuit. Connect between the two positive sides.

Reference numeral 3 denotes a second circuit, which connects its positive side to the positive side of the power source 1 and connects its negative side to the negative side of the power source 1. The second circuit 3 connects the second solenoid 3A, the second switching element 3B, and the second protective diode 3C in series, and further connects the second light emitting element 3D and the second return diode 3E to the second solenoid. It is connected in parallel with 3A. The second solenoid 3A generates a driving force by excitation by energization, and the driving force of the solenoid valve (not shown) moves in the other direction opposite to the movement in one direction by the first solenoid 2A. The second switching element 3B is a field effect transistor, and controls the current flowing through the second solenoid 3A by a switching operation.
The second protective diode 3C is arranged in the same direction as the first protective diode 2C, and the positive side and the negative side of the second circuit 3 are mistakenly connected to the positive side and the negative side of the power supply 1. In this case, the malfunction prevention by energization of the second solenoid 3A and the protection of the second switching element 3B are achieved. The second light emitting element 3D is a light emitting diode and makes it possible to visually recognize that the second solenoid 3A is energized by light emission. The second free-wheeling diode 3E is arranged in the same direction as the first free-wheeling diode 2E, and the back electromotive force generated immediately after the current is cut off is recirculated from the negative side to the positive side, and a surge voltage is applied to the second solenoid 3A. Is prevented from occurring. A capacitor 3F is disposed between the gate and the source of the second switching element 3B to absorb noise acting on the gate. 3G is a second contact that is normally open, and is disposed between the positive side of the power source 1 and the positive side of the second circuit 3, and is closed by an operation in accordance with a drive command signal, and the positive side of the power source 1 and the second circuit. 3 is connected to the positive side. The positive side of the first circuit 2 and the positive side of the second circuit 3 are connected to the positive side of the power supply 1 without being connected to each other. Further, the negative side of the first circuit 2 and the positive side of the second circuit 3 are connected to each other by a line 4 and connected to the negative side of the power source 1. In addition, the first contact 2G and the second contact 3G serve as operation means for selectively providing energization to the first circuit 2 and the second circuit 3. These constitute a negative common connection configuration.

  A control circuit 5 includes a first terminal 5A connected to the positive side of the first circuit 2, a second terminal 5B connected to the positive side of the second circuit 3, and a third terminal connected to the negative side of the first circuit 2. A terminal 5C and a fourth terminal 5D connected to the negative side of the second circuit 3, and an oscillation circuit 6, a timer circuit 7 and a switch circuit 8 are provided as main components inside the terminal, An ON signal is output to the first or second switching element 2B or 3B in order to perform rated energization to the first or second solenoid 2A or 3A, and the first or second solenoid 2A or 3A is output over a second period. In addition, an ON / OFF signal is output to the first or second switching element 2B or 3B in order to perform power saving energization by PWM constant control. The oscillation circuit 6 includes five resistors R1, R2, R3, R4, and R5, two NPN transistors 9A and 9B, two capacitors 10A and 10B, and two diodes 11A and 11B. The first terminal 5A and the second terminal 5B are connected by a line 12, and a resistor R1 is disposed on the line 12. Two resistors R2 and R3 are branched and connected in parallel between the first terminal 5A of the line 12 and the resistor R1, and two resistors R4 and R5 are connected between the second terminal 5B and the resistor R1. Branch connection in parallel. The resistors R2 and R3 branched and connected to the line 12 are connected to the line 14, and the line 14 has one end connected to the base of the other NPN transistor 9B and the other end connected to the third terminal 5C. The resistors R4 and R5 branched and connected to the line 12 are connected to the line 15, and the line 15 has one end connected to the base of one NPN transistor 9A and the other end connected to the fourth terminal 5D. The NPN transistors 9A and 9B are for outputting ON / OFF signals to the first and second switching elements 2B and 3B. The duty ratio and period of the ON / OFF signals are resistors R2 to R5 and a capacitor 10A. 10B. Between the connection point of the resistor R2 and the connection point of the resistor R3 of the line 14, the collector of one NPN transistor 9A is connected and one capacitor 10A is disposed. Further, the collector of the other NPN transistor 9B is connected between the connection point of the resistor R4 and the connection point of the resistor R5 on the line 15, and the other capacitor 10B is disposed. The emitters of the NPN transistors 9A and 9B are connected to each other by a line 16, and one diode 11A and the other diode 11B are arranged facing each other on the line 16, and one diode 11A is connected to one NPN transistor 9A. Current flow from the emitter side to the emitter side of the other NPN transistor 9B is allowed, and current flow in the opposite direction is blocked. The other NPN type transistor allows current flow from the emitter side of the other NPN type transistor 9B to the emitter side of one NPN type transistor 9A, and blocks current flow in the opposite direction. Then, a line 17 is provided which branches from a connection point of one diode 11A of the line 16 and a connection point of the other diode 11B to the switch circuit 8. Reference numeral 18 denotes a line that branches from between the first terminal 5A of the line 12 and the connection point of the resistor R2 to reach the timer circuit 7.

  In the timer circuit 7, a resistor R6 and a capacitor 19 are arranged in series on a line 18, a line 20 is branched and connected between the resistor R6 and the capacitor 19, a constant voltage diode 21 is arranged on the line 20, and a line 18 and 20 reach the switch circuit 8. Then, the time of the first period for performing the rated energization to the first or second solenoid 2A or 3A is set by the resistance value of the resistor R6, the capacitance of the capacitor 19 and the voltage at which the current of the constant voltage diode 21 starts to flow. . Further, a line 23 in which a diode 22 is arranged in parallel with the line 20 is provided, and the line 23 reaches the switch circuit 8. The diode 22 discharges the voltage accumulated in the capacitor 19.

  The switch circuit 8 includes an NPN transistor 24 and a PNP transistor 25 as main components. The NPN transistor 24 has a base connected to the line 20, a collector connected to the base of the PNP transistor 25, and an emitter connected to the line 18. The line 18 connected to the emitter of the NPN transistor 24 is connected to the line 14 via the line 26 and to the line 15 via the line 27. A PNP transistor 25 having a base connected to the collector of the NPN transistor 24 has a collector connected to the line 17 from the oscillation circuit 6 and a line 23 from the timer circuit 7, and an emitter connected to the base of the NPN transistor 24. Further, it is connected to the emitter of the NPN transistor 24 via the capacitor 28. The capacitor 28 absorbs noise acting on the base of the NPN transistor 24. After the lapse of the first period set by the timer circuit 7, the switch circuit 8 is turned on when the current flows from the line 20 to the base of the NPN transistor 24, and the NPN transistor 24 is turned on. The transistor 25 is turned on, and a current from the line 17 of the oscillation circuit 6 flows.

  In the control circuit 5, resistors R7 and R8 are arranged in series on the line 14, and resistors R9 and R10 are arranged in series on the line 15. The line 30 branched from the resistance R7 and the resistance R8 of the line 14 is connected to the gate of the first switching element 2B, and the ON signal from the oscillation circuit 6 that has been divided by the resistances R7 and R8 to reduce the voltage, An ON / OFF signal is output to the gate of the first switching element 2B. Further, the line 31 branched from the resistance R9 and the resistance R10 of the line 15 is connected to the gate of the second switching element 3B, and the voltage is reduced by dividing the voltage by the resistances R9 and R10. A signal or ON / OFF signal is output to the gate of the second switching element 3B.

  A first diode 32A is disposed between the first terminal 5A of the line 12 and the oscillation circuit 6 in the control circuit 5, and allows the current to flow from the first terminal 5A to the oscillation circuit 6 and the oscillation circuit. The current flow from 6 to the first terminal 5A is blocked. A second diode 32B is arranged between the second terminal 5B of the line 12 and the oscillation circuit 6, and allows a current to flow from the second terminal 5B to the oscillation circuit 6 and from the oscillation circuit 6 to the second terminal. Block current flow to 5B. Reference numeral 32C denotes a third diode, which is arranged between the third terminal 5C of the line 14 and the portion where the line 26 from the switch circuit 8 in the control circuit 5 is connected, and is connected to the third terminal from the oscillation circuit 6 and the switch circuit 8. The flow of current to 5C is allowed and the flow of current from the third terminal 5C to the oscillation circuit 6 and the switch circuit 8 is blocked. Reference numeral 32D denotes a fourth diode, which is arranged between the fourth terminal 5D of the line 15 and the portion where the line 27 from the switch circuit 8 is connected. The current from the oscillation circuit 6 and the switch circuit 8 to the fourth terminal 32D The flow is allowed and current flow from the fourth terminal 32D to the oscillation circuit 6 and the switch circuit 8 is blocked. 33A and 33B are capacitors that absorb noise, and the capacitor 33A branches from between the first terminal 5A of the line 12 and the first diode 32A, and is between the third terminal 5C of the line 14 and the third diode 32C. It arrange | positions to the line 34A connected to. The capacitor 33B is arranged on a line 34B that branches from between the second terminal 5B of the line 12 and the second diode 32B and is connected between the fourth terminal 5D of the line 15 and the fourth diode 32D.

Next, the operation of this configuration will be described.
In the state shown in FIG. 1, the first contact 2G and the second contact 3G are both open, the first solenoid 2A and the second solenoid 3A are both deenergized, and the valve body (not shown) is neutral. Located in position.

  In this state, when the first contact 2G is closed by the drive command signal, the current from the positive side of the power source 1 is controlled from the first terminal 5A to the first circuit 2 via the closed first a contact 2G. It passes through the circuit 5 in parallel and flows to the negative side of the power supply 1. At this time, since the second contact 3G maintains the open state, no current flows through the second circuit 3 via the second contact 3G.

  The current flow in the control circuit 5 will be described in detail. The current flowing through the line 12 from the first terminal 5A is blocked from flowing to the second terminal 5B by the second diode 32B, and the resistors R2 and R3 of the oscillation circuit 6 are blocked. Flows to the line 14, and to the lines 15 and 18 via the resistors R 4 and R 5. Since the current flowing from the line 18 to the timer circuit 7 does not flow from the constant voltage diode 21 to the base of the NPN transistor 24 of the switch circuit 8 until the first period elapses, the NPN transistor 24 is turned OFF, Correspondingly, the PNP transistor 25 is also turned off. When the PNP transistor 25 of the switch circuit 8 is turned off, the current flowing through the line 17 is cut off, and the NPN transistors 9A and 9B of the oscillation circuit 6 are turned off. For this reason, the current flowing through the line 14 is output as an ON signal from the line 30 to the gate of the first switching element 2B, and flows from the third diode 32C through the third terminal 5C to the negative side of the power source 1.

  The first switching element 2B is turned on in response to an ON signal received at the gate, the first solenoid 2A is energized at a rated power, and moves the valve body in one direction. The current flowing through the line 15 is output from the line 31 to the gate of the second switching element 3B as an ON signal, and flows from the fourth diode 32D through the fourth terminal 5D, the line 4, and the third terminal 5C. It flows to the negative side of the power source 1 both in the flow through the lines 27, 26 and 14, the third diode 32C, and the third terminal 5C. The second switching element 3B is turned on in response to the ON signal received at the gate, but since the current does not flow through the second circuit 3 as described above, the second solenoid 3A is not energized.

  When the voltage of the current flowing from the line 18 to the timer circuit 7 exceeds the set voltage of the constant voltage diode 21, the first period elapses and the second period starts, and the NPN transistor 24 and the PNP transistor 25 of the switch circuit 8. Is turned on, and the current of the line 17 from the oscillation circuit 6 flows. Therefore, the NPN transistors 9A and 9B of the oscillation circuit 6 are turned on / off, and this ON / OFF operation causes a phase between one NPN transistor 9A and the other NPN transistor 9B by the resistor R1. . The current flowing through the line 14 corresponds to the ON / OFF operation of one NPN transistor 9A and is OFF when one NPN transistor 9A is ON, and is ON / OFF which is ON when one NPN transistor 9A is OFF. An OFF signal is output from the line 30 to the gate of the first switching element 2B, and flows from the third diode 32C to the negative side of the power source 1 through the third terminal 5C.

  The first switching element 2B is turned on / off in response to an ON / OFF signal received at the gate, and the first solenoid 2A is energized with less power than the rated energization, and the valve body that has been moved in one direction is moved in one direction. Hold at the moving position. Further, the current flowing through the line 15 is output from the line 31 to the gate of the second switching element 3B as an ON / OFF signal in which ON and OFF are reversed corresponding to the ON / OFF operation of the other NPN transistor 9B. In the same manner as described above, the electric current flows through both sides to the negative side of the power source 1. The second switching element 3B is turned ON / OFF according to the ON / OFF signal received at the gate. However, since no current flows through the second circuit 3 as described above, the second solenoid 3A is not energized.

  In this state, when the first contact 2G is opened by releasing the drive command signal, the first solenoid 2A is de-energized, and the valve body held in the one-way moving position is moved to the neutral position by a spring force or the like. Return.

  When the second contact 3G is closed by the drive command signal in the state of FIG. 1 in which the valve body is in the neutral position, the current from the positive side of the power source 1 is supplied to the second terminal via the closed second contact 3G. 5B passes through the second circuit 3 and the control circuit 5 in parallel and flows to the negative side of the power source 1. At this time, since the first contact 2G is kept open, no current flows through the first circuit 2 via the first contact 2G.

  The current flowing from the second terminal 5B through the line 12 is blocked from flowing to the first terminal 5A by the first diode 32A and flows through the line 14, the line 15 and the line 18. Until the first period set by the timer circuit 7 elapses, the NPN transistors 9A and 9B of the oscillation circuit 6 are OFF, and the current flowing through the line 15 is supplied as an ON signal from the line 31 to the second switching element 3B. Output to the gate and flow to the negative side of the power supply 1 both in the flow through the fourth diode 32D and in the flow through the lines 27, 26, 14 and the third diode 32C.

  The second switching element 3B is turned on in response to an ON signal received at the gate, the second solenoid 3A is energized at a rated power, and moves the valve body in the other direction opposite to the one direction. Further, the current flowing through the line 14 outputs an ON signal to the gate of the first switching element 2B, flows from the third diode 32C to the negative side of the power source 1, and the first switching element 2B is turned on. As described above, since no current flows through the first circuit 2, the first solenoid 2A is not energized.

  When the first period elapses and the second period is reached, the current flows through the constant voltage diode 21, so that the NPN transistor 24 and the PNP transistor 25 of the switch circuit 8 are turned on, and the line 17 from the oscillation circuit 6 is turned on. A current flows, and the NPN transistors 9A and 9B of the oscillation circuit 6 are turned on / off. The current flowing through the line 15 becomes an ON / OFF signal in which ON and OFF are reversed in response to the ON / OFF operation of the other NPN transistor 9B, and is output from the line 31 to the gate of the second switching element 3B. , Both the flow through the fourth diode 32D and the flow through the third diode 32C flow to the negative side of the power source 1.

  The second switching element 3B is turned on / off in response to an ON / OFF signal received at the gate, and the second solenoid 3A is energized with less power than the rated energization and moves the valve body in the other direction. Hold at the moving position. Also, the current flowing through the line 14 is output from the line 30 to the gate of the first switching element 2B as an ON / OFF signal in which ON and OFF are reversed corresponding to the ON / OFF operation of one NPN transistor 9A. , Flows through the third diode 32C to the negative side of the power source 1. As described above, since no current flows through the first circuit 2, the first solenoid 2A is not energized. When the second contact 3G is opened by releasing the drive command signal, the second solenoid 3A is de-energized, and the valve body held at the moving position in the other direction is returned to the neutral position by a spring force or the like. .

  With this operation, the negative side of the first circuit 2 and the negative side of the second circuit 3 are connected to each other by the line 4 to be connected to the negative side of the power source 1 and to the positive side of the power source 1. On the positive side of the first circuit 2 and the positive side of the second circuit 3, which are connected to each other, the first contact 2G and the second contact 3 can be selected as an operating means so that energization to the first circuit 2 and the second circuit 3 can be selected. The second contact 3G is provided to form a negative common connection configuration, and when the first solenoid 2A is energized, the second diode 3B prevents the second solenoid 3A from being energized, and the second solenoid When energizing 3A, the first diode 32A prevents the first solenoid 2A from energizing. For this reason, the two switching elements may be the first switching element 2B connected in series to the first solenoid 2A and the second switching element 3B connected in series to the second solenoid 3A. The number can be reduced, and the configuration can be simplified.

  The control circuit 5 includes a timer circuit 7 for setting a first period and an oscillation circuit 6 for outputting an ON / OFF signal to the first or second switching element 2B or 3B. The timer circuit 7 has a first period. The transistors 24 and 25 of the switch circuit 8 are turned off to disable the output of the ON / OFF signal from the oscillation circuit 6. For this reason, the 1st period set by the timer circuit 7 can be made into the optimal value according to the specification of a valve.

FIG. 2 shows another embodiment of the present invention. The same parts as those of the embodiment are denoted by the same reference numerals, and the description thereof is omitted. Only different parts will be described.
The positive side of the first circuit 2 and the positive side of the second circuit 3 are connected to each other by a line 35 and connected to the positive side of the power source 1. Further, the negative side of the first circuit 2 and the negative side of the second circuit 3 are connected to the negative side of the power source 1 without being connected to each other. A normally open first a contact 2H is arranged between the negative side of the power source 1 and the negative side of the first circuit 2, and between the negative side of the power source 1 and the negative side of the second circuit 3. The second a-contact 3H that is normally open is arranged to provide a selection means for selectively supplying power to the first circuit 2 and the second circuit 3. Thus, a positive common connection configuration is formed.

  When the first contact 2H is closed by an excitation command in the state shown in FIG. 2 in which the valve body (not shown) is located at the neutral position, the current from the positive side of the power source 1 is supplied from the first terminal 5A to the first circuit. 2, flows from the first terminal 5 </ b> A and the second terminal 5 </ b> B through the control circuit 5, and flows from the third terminal 5 </ b> C to the negative side of the power supply 1 through the closed first contact 2 </ b> H. At this time, the second contact 3H remains open, and current flow from the fourth terminal 5D connected to the negative side of the second circuit 3 by the fourth diode 32D to the control circuit 5 is prevented. Therefore, no current flows through the second circuit 3.

  The current flowing through the line 12 from the first terminal 5A and the second terminal 5B flows through the line 14, the line 15 and the line 18, and the current flowing through the line 18 flows into the timer circuit 7. Since the NPN transistors 9A and 9B of the oscillation circuit 6 are OFF until the first period set by the timer circuit 7 elapses, the currents flowing through the lines 14 and 15 are first and first as ON signals from the lines 30 and 31, respectively. 2 is output to the gates of the switching elements 2B and 3B and flows from the third diode 32C to the negative side of the power supply 1 through the third terminal 5C and the closed first a contact 2H.

  The first switching element 2B is turned on in response to an ON signal received at the gate, the first solenoid 2A is energized at a rated power, and moves the valve body in one direction. The second switching element 3B is turned on in response to an ON signal received at the gate, but since no current flows through the second circuit 3 as described above, the second solenoid 3A is not energized.

  When the first period elapses and the second period is reached, the transistors 24 and 25 of the switch circuit 8 are turned ON, and the NPN transistors 9A and 9B of the oscillation circuit 6 are turned ON / OFF. The currents flowing through the lines 14 and 15 become ON / OFF signals in which ON and OFF are reversed corresponding to the ON / OFF operations of the respective NPN transistors 9A and 9B. The signal is output to the gates of the switching elements 2B and 3B, and flows from the third diode 32C to the negative side of the power source 1 through the third terminal 5C and the closed first contact 2H.

  The first switching element 2B is turned on / off in response to an ON / OFF signal received at the gate, and the first solenoid 2A is energized with less power than the rated energization, and the valve body that has been moved in one direction is moved in one direction. Hold at the moving position. The second switching element 3B is turned ON / OFF according to the ON / OFF signal received at the gate. However, since no current flows through the second circuit 3 as described above, the second solenoid 3A is not energized. When the first contact 2H is opened by releasing the drive command signal, the first solenoid 2A is deenergized, and the valve body held in the one-way moving position is returned to the neutral position by a spring force or the like. .

  When the second contact 3H is closed by the drive command signal in the state shown in FIG. 2 in which the valve body (not shown) is located at the neutral position, the current from the positive side of the power source 1 passes through the line 35 from the first terminal 5A. The negative terminal of the power source 1 flows through the second terminal 3B, passes through the second circuit 3, passes through the control circuit 5 from the first terminal 5A and the second terminal 5B, and passes through the second contact 3H closed from the fourth terminal 5D. Flowing into. At this time, the first contact 2H is kept open, and current flow from the third terminal 5C connected to the negative side of the first circuit 2 by the third diode 32C to the inside of the control circuit 5 is blocked. Therefore, no current flows through the first circuit 2.

  In the first period set by the timer circuit 7, the second switching element 3B is turned on to energize the second solenoid 3A and move the valve body in the other direction. Then, when the first period has elapsed and the second period has been reached, the second switching element 3B is turned on / off, the second solenoid 3A is energized with less power than the rated energization, and the movement in the other direction is completed. Hold the valve body in the moving position in the other direction. When the second contact 3H is opened by releasing the drive command signal, the second solenoid 3A is de-energized, and the valve body held at the moving position in the other direction is returned to the neutral position by a spring force or the like. .

  With this operation, the positive side of the first circuit 2 and the positive side of the second circuit 3 are connected to each other by a line 35 to be connected to the positive side of the power source 1 and to the negative side of the power source 1. On the negative side of the first circuit 2 and the negative side of the second circuit 3 that are connected to each other, the first contact 2H and the first contact 2H can be selected as an operating means so that energization to the first circuit 2 and the second circuit 3 can be selected. The second contact 3H is provided to form a positive common connection configuration, and when the first solenoid 2A is energized, the fourth diode 32D prevents the second solenoid 3A from being energized, and the second solenoid When energizing 3A, the third diode 32C prevents the first solenoid 2A from energizing. For this reason, as in the embodiment, the switching elements are two, ie, the first switching element 2B connected in series to the first solenoid 2A and the second switching element 3B connected in series to the second solenoid 3A. Well, the number of switching elements to be used can be reduced, and the configuration can be simplified. Further, similarly to the embodiment, the first period set by the timer circuit 7 can be set to an optimum value according to the specification of the valve.

  The solenoid valve drive control device of one embodiment shown in FIG. 1 and the solenoid valve drive control device of another embodiment shown in FIG. 2 both permit the flow of current from the first terminal 5A into the control circuit 5. A first diode 32A for blocking current flow from the inside of the control circuit 5 to the first terminal 5A, and a current flow from the second terminal 5B to the inside of the control circuit 5 are allowed and the second terminal from the inside of the control circuit 5 is allowed. The second diode 32B for blocking the flow of current to 5B and the flow of current from the inside of the control circuit 5 to the third terminal 5C are allowed and the flow of current from the third terminal 5C to the inside of the control circuit 5 is blocked. And a fourth diode 32D that allows a current flow from the inside of the control circuit 5 to the fourth terminal 5D and prevents a current flow from the fourth terminal 5D to the inside of the control circuit 5. Provide. Then, the negative side of the first circuit 2 and the negative side of the second circuit 3 are connected to each other by a line 4 to be connected to the negative side of the power source 1, and without being connected to the positive side of the power source 1 respectively. On the positive side of the first circuit 2 and the positive side of the second circuit 3 that are specially connected, the first contact 2G and the second contact can be selectively operated by operating the first circuit 2 and the second circuit 3, respectively. The negative common connection configuration shown in FIG. 1 provided with 3G, and the positive side of the first circuit 2 and the positive side of the second circuit 3 are connected to each other by a line 35 and connected to the positive side of the power source 1, The first circuit 2 and the second circuit 3 can be electrified freely on the negative side of the first circuit 2 and the negative side of the second circuit 3 that are connected to the negative side of the power source 1 without being connected to each other. The positive side common connection configuration shown in FIG. 2 provided with the first contact 2H and the second contact 3H as the operation means is made selectable. For this reason, the first circuit 2, the second circuit 3, and the control circuit 5 included in the electromagnetic valve driving device can be shared and applied to the negative common connection configuration and the positive common connection configuration. It is not necessary to prepare a solenoid valve driving device having a connection configuration and a solenoid valve driving device having a positive common connection configuration, and the number of types of the solenoid valve driving devices can be reduced.

It is an electric circuit diagram of a solenoid valve driving device showing an embodiment of the present invention. It is the electric circuit diagram of the solenoid valve drive device which showed other embodiment.

Explanation of symbols

1: power supply 2: first circuit 2A, 3A: solenoid 2B, 3B: switching element 3: second circuit 5: control circuit 5A: first terminal 5B: second terminal 5C: third terminal 5D: fourth terminal 32A, 32B, 32C, 32D: Diode

Claims (2)

The valve body of the solenoid valve is moved by the driving force generated by the excitation of either the first solenoid or the second solenoid, and the application start point of application of the drive command signal to either the first solenoid or the second solenoid During the first period in which the movement of the valve body is completed, rated energization is performed based on the rated voltage to obtain a driving force sufficient to move the valve body, and the movement is completed over the second period after the first period has elapsed. An electromagnetic valve drive control device for holding the valve body in a moving position by performing power-saving energization less than the rated energization by PWM control, and a first circuit in which a first solenoid and a first switching element are connected in series A second circuit in which a second solenoid and a second switching element are connected in series, and a first or second solenoid for rated energization of the first or second solenoid over a first period. An ON signal is output to the second switching element, and an ON / OFF signal is output to the first or second switching element to perform power saving energization by PWM control to the first or second solenoid over the second period. and a control circuit for, control is control circuit and a first terminal connected to the positive side of the first circuit, a second terminal connected to the positive side of the second circuit, a third connecting to the negative side of the first circuit A terminal and a fourth terminal connected to the negative side of the second circuit, each terminal is internally connected, and between the first terminal and the control circuit, the first terminal is connected to the control circuit. A first diode that allows current flow and blocks current flow from the inside of the control circuit to the first terminal is provided, and between the second terminal and the inside of the control circuit, the second terminal leads to the inside of the control circuit. Allow current flow and from control circuit to second terminal A second diode provided for blocking the flow of fluid, to the control circuit inside the third terminal with between the control circuit inside the third terminal to allow current flow from the internal control circuit to the third terminal A third diode for blocking current flow is provided, and current flow from the control circuit to the fourth terminal is allowed between the fourth terminal and the control circuit, and from the fourth terminal to the control circuit. A fourth diode for blocking current flow is provided, and the positive side of the first circuit and the positive side of the second circuit are connected to the positive side of the power source without being connected to each other. The negative side and the negative side of the second circuit are connected to each other and connected to the negative side of the power source, and the first side of the positive side of the first circuit and the positive side of the second circuit are connected to the positive side of the power source. Negative-side common connection configuration in which operation means is provided so that energization to the circuit and the second circuit can be selected , and the first circuit The positive side of the second circuit and the positive side of the second circuit are connected to each other and connected to the positive side of the power source, and the negative side of the first circuit and the negative side of the second circuit are not connected to each other. Specially connected to the negative side, and an operating means is provided on the negative side of the first circuit and the negative side of the second circuit that are specially connected to the negative side of the power supply so that energization to the first circuit and the second circuit can be selected. A solenoid valve drive control device characterized in that the positive side common connection configuration is selectable . The control circuit includes a timer circuit that sets the first period and an oscillation circuit that outputs an ON / OFF signal to the first or second switching element, and the timer circuit includes the oscillation circuit over the first period. 2. The solenoid valve drive control device according to claim 1, wherein the output of the ON / OFF signal is disabled.

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