JP2507994Y2 - Solenoid valve solenoid drive circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] << Industrial Application Field >> The present invention relates to an improvement of a solenoid drive circuit for driving a two-wire latching solenoid used in a solenoid valve.

<< Prior Art >> As a solenoid used for a gas cutoff valve having a built-in power source such as a lithium battery, a two-wire type latching solenoid with low power consumption is generally used.

This two-wire latching solenoid causes a pulse current in the direction of weakening the magnetic force to the permanent magnet, or a pulse current in the direction of increasing the magnetic force to cause the plunger to appear and disappear in the coil, and the plunger does not move even in the non-excited state thereafter. Since the changed position is maintained, the basic current consumption is extremely small.

In addition, the solenoid drive circuit for this uses a switching element that sends a positive excitation current to the coil by a positive pulse input, and a switching element that sends a reverse excitation current to the coil by a reverse pulse input. What has been used is used.

<< Problems to be Solved by the Invention >> In this type of solenoid drive circuit, if pulses are simultaneously input in the forward and reverse directions due to an erroneous signal, both switching means are driven, and the circuit may be destroyed.

Therefore, conventionally, a logic circuit such as a flip-flop is provided in the preceding stage of each switching means to prohibit the input to the other side when one side enters the input state, but the circuit is complicated. Further, there are disadvantages such as an increase in cost and an increase in size and shape.

Therefore, an object of the present invention is to provide a solenoid valve solenoid drive circuit in which a simple configuration is added to the inside of the circuit to stop the input of the other side when one side is in a driving state.

[Means for Solving the Problem] <Means for Solving the Problems> In order to achieve the above object, the present invention is for driving a two-wire latching solenoid used in combination with a spring in a solenoid valve or the like by forward and reverse pulse signals. A solenoid valve solenoid drive circuit, which is connected to a forward direction exciting means for exciting the solenoid coil in a positive direction, a reverse direction exciting means for exciting the coil in a reverse direction, and an external input means. In the solenoid drive circuit provided with the forward and reverse switching means for individually driving the positive direction excitation means and the reverse direction excitation means, respectively, the current from one of the excitation means is driven in the drive state of the one of the switching means. Driving the other side switching means by applying it to the other side switching means via the rectifying means A.

<< Operation >> According to the above configuration, if one side is input in the circuit, the input state of the other side is stopped, so that it is not necessary to provide another input inhibiting means.

<< Embodiment >> An embodiment of the present invention will be described below in detail with reference to the drawings.

In the figure, both ends of the coil 1 of the two-wire type monostable latching solenoid are provided in the package 2 with the forward direction exciting transistors 3a and 3b as the forward direction exciting means and the reverse direction exciting transistor as the reverse direction exciting means. 4a, 4
It is connected to b through coil connection terminals 5 and 6.

In addition to the power supply terminal Vcc and the ground terminal Gd, the package 2 is provided with terminal portions 7 and 8 for inputting forward and reverse command signals, and these receive pulse signals from a controller (not shown).

Each of the positive direction excitation transistors 3a and 3b is connected to a positive direction switching transistor 9 as switching means connected to the positive input terminal portion 7 side, and each of the reverse direction excitation transistors 4a and 4b is connected to a reverse input terminal 8 of the positive direction switching transistor 9a. It is connected to a reverse switching transistor 10 as switching means connected to the side.

A limiting resistor 11 for limiting the reverse exciting current is interposed between the reverse exciting transistor 4a and the coil connection terminal 6.

Further, the collector of the forward direction excitation transistor 3a is connected to the base of the excitation transistor 3b via the resistor 12 and the diode 13 as a reverse direction limiting means, and the reverse direction switching transistor 10 is connected via the diode 14. It is connected to the collector side.

Similarly, the collector of the reverse-direction exciting transistor 4a is connected to the base of the exciting transistor 4b via a resistor 15 and a diode 16 as limiting means in the positive direction, and the forward-direction switching transistor 9 is connected via a diode 17. Connected to the collector side of.

In the above configuration, when a positive pulse flows through the positive input terminal 7 to the positive switching transistor 9, the positive excitation transistors 3a and 3b are driven, and a positive excitation current indicated by a solid arrow is applied to the coil 1. The magnetic flux corresponding to the number of turns of the coil 1 is generated by this exciting current, and the driving force corresponding to the magnetic force is generated in the solenoid.

Further, the collector current of the forward direction excitation transistor 3a is supplied to the collector side of the reverse direction switching transistor 10, and even if a reverse direction pulse is applied to the reverse direction switching transistor 10 and a base current is applied, the switching state does not occur, and The exciting current in the direction does not occur.

When a reverse pulse flows to the reverse switching transistor 10 through the reverse input terminal 8, the switching of the forward switching transistor 9 is stopped by the same action as described above. The operation of is stopped and the safety inside the circuit is maintained.

<Effects of the Invention> As described in detail with reference to the embodiments above, in the solenoid valve solenoid drive circuit according to the present invention, when one side is input in the circuit, the input state of the other side is stopped. Therefore, it is not necessary to provide another input prohibiting means, and the circuit structure in the package forming the solenoid drive circuit can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram showing a drive circuit of a solenoid for a solenoid valve according to the present invention. 1 ... Solenoid coil 2 ... Package 3a, 3b ... Forward direction excitation transistor 4a, 4b ... Reverse direction excitation transistor 9 ... Forward direction switching transistor 10 ... Reverse direction switching transistor 12, 13, 14 ... Forward direction rectification means ( 12… Resistance, 13,14… Diode) 15,16,17… Reverse rectification means (15… Resistance, 16,17… Diode)

Claims (1)

(57) [Scope of utility model registration request] 1. A solenoid valve solenoid drive circuit for driving a two-wire type latching solenoid used in combination with a spring in an electromagnetic valve or the like by a forward / reverse pulse signal, wherein a coil of the solenoid is excited in a positive direction. For exchanging the forward direction, for exciting the coil in the opposite direction, for exciting the coil in the opposite direction, and for connecting the external input means to drive the forward exciting means and the backward exciting means individually. In the solenoid drive circuit including the switching means, the other switching means is driven by applying the current from the one exciting means to the other switching means via the rectifying means in the driving state of the one switching means. A drive circuit for a solenoid for a solenoid valve, characterized in that the solenoid is stopped.