JP2625886B2 - relay - Google Patents

Description

The present invention relates to a relay, and more particularly, to a self-holding latching relay.

(Prior Art and Problems to be Solved by the Invention) Conventionally, as a latching relay, a coil is wound around an iron core to form an electromagnet portion, and a drive voltage is applied to the electromagnet portion to generate a magnetic flux. On the other hand, a magnetic circuit is formed by the magnetic flux of the permanent magnet while the movable contact piece is driven by the magnetic field, and the open / close state of the contact is maintained. But with this one,
Even if an attempt is made to reduce the thickness of the device, it is difficult to reduce the thickness of the latching relay because there is a limit in reducing the thickness of the internal components, in particular, the permanent magnet and the electromagnet. For this reason, a self-return type single relay having no permanent magnet has been used as a latching relay.

However, in order to use a single relay as a latching relay, a drive voltage must be constantly applied to the coil, so that there is a problem that heat is easily generated and power consumption is large.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a thin and low-power latching relay.

(Means for Solving the Problems) In order to achieve the above object, a relay according to the present invention
A substrate having a fitting hole, and having a drive coil portion formed by printing in a substantially spiral shape around the fitting hole,
An iron core whose one end is fitted into the fitting hole and protrudes, and an intermediate portion is adsorbed and separated from the protruding one end of the iron core based on excitation and demagnetization of the drive coil unit, so that the core is free. A movable contact piece for bringing a movable contact provided at an end into and away from a fixed contact provided on a substrate; and a load current flowing through the movable contact piece when the movable contact comes into contact with the fixed contact. In this configuration, a latching coil unit for exciting one end of the core is provided.

(Operation) Therefore, according to the present invention, when a drive voltage is applied to the drive coil portion, the iron core is excited to attract the movable contact piece, and the movable contact provided at the free end of the movable contact piece becomes the fixed contact. Contact. The load current flowing through the movable contact piece flows through the latching coil portion provided on the substrate to excite the iron core. Therefore, even when the drive voltage is not applied, the load current is generated in the iron core by the load current. Magnetic force will continue to hold the movable contact piece and keep closing the contacts.

(Embodiment) An embodiment according to the present invention will be described below with reference to the accompanying drawings of FIGS.

The relay according to the present embodiment generally includes a board 1 and an iron core 2.
And the movable contact piece 3.

The substrate 1 is made of an insulating material in which a through hole 11 and fitting holes 12 and 13 are sequentially provided on the same straight line. A driving coil formed on one surface of the substrate 1 in a substantially spiral shape around the fitting hole 12 is formed. It has a part 14. This drive coil part 14 is printed wiring
They are electrically connected to coil terminals 19d, 19e via 18d, 18e, respectively.

Further, first and second fixed contacts 16, 17 are printed on the front and back surfaces of one end of the substrate 1, respectively. The first and second fixed contacts 16 and 17 are electrically connected to contact terminals 19a and 19b via printed wirings 18a and 18b printed on the front and back surfaces of the substrate 1, respectively. In addition, the printed wiring 18a is formed by printing so as to surround the periphery of the drive coil portion 14 printed around the fitting hole 12, and functions as a latching coil.

The iron core 2 is made of a magnetic material having a substantially U-shaped cross section. Both ends 21 and 22 are fitted and fixed to the fitting holes 12 and 13 of the substrate 1 from the back side, respectively. It is protruding.

The movable contact piece 3 is provided with first and second movable contacts 33 and 34 respectively on divided pieces 31 and 32 formed by dividing one end portion into two in the width direction, and bends the divided piece 32 to form the movable contact piece 3. A step is provided between them.

After the divided piece 32 of the movable contact piece 3 is inserted into the through hole 11, one end 35 thereof is connected to the protruding end 22 of the iron core 2.
The first and second movable contacts 33 and 34 are printed on the front and back surfaces of the substrate 1 by arranging the intermediate portion so as to be able to contact and separate from the protruding end portion 21 of the iron core 2. The first and second fixed contacts 16 and 17 are formed so as to be able to contact and separate from each other. One end 35 of the movable contact piece 3 is connected to the printed wiring 18c.
Is electrically connected to the common terminal 19c via the.

Therefore, in the relay according to the present embodiment, in the case of non-excitation, the spring force of the movable contact piece 3 causes the second movable contact 34 to contact the second fixed contact 17 while the first movable contact 33 It is separated from the fixed contact 16.

Next, as shown in the time charts of FIGS. 3 and 4, when the switches 41 and 42 are closed and a pulse voltage is applied as a drive voltage to the drive coil unit 14 via the coil terminals 19d and 19e, the drive coil The portion 14 is excited, and a magnetic force is generated in the iron core 2, and the end 21 of the iron core 2 becomes a magnetic pole and attracts the movable contact piece 3. For this reason, the movable contact piece 3 rotates about the one end 35 as a fulcrum, and an intermediate portion thereof is attracted to the end 21 of the iron core 2 to close the magnetic circuit. As a result, the second movable contact 34 is
After being separated from the fixed contact 17, the first movable contact 33 comes into contact with the first fixed contact 16, and a load current flows through the movable contact piece 3. Therefore, the printed wiring 18a (latching coil portion) is excited, and the load current causes the iron core 2 to generate a magnetic force. As a result, even after the application of the driving voltage is stopped, the movable contact piece 3 continues to be attracted to the end 21 of the iron core 2 and the state is maintained.

Next, in order to cancel the magnetic force due to the load current, when the switches 41 and 42 were switched and a pulse voltage was applied to the drive coil unit 14 in the opposite direction to the above, the magnetic force due to the load current and the magnetic force due to the pulse voltage were canceled. Thereafter, the first and second movable contacts 33 and 34 return to the original state by the spring force of the movable contact piece 3.

According to the present embodiment, when the load current stops flowing due to the power failure, the movable contact piece 3 returns to the original state, so that there is an advantage that the power failure can be detected.

In the above-described embodiment, the case where the drive coil section 14 is provided on one side surface of the substrate 1 has been described. However, the present invention is not limited to this, and one drive coil section is provided on the front and back surfaces with the fitting hole 12 as the center. Of course, it may be possible.

(Effects of the Invention) As is clear from the above description, according to the present invention, since the drive coil is formed by printing on the substrate and there is no permanent magnet, the number of parts is smaller than that of the relay according to the conventional example. The structure becomes simple and the relay becomes thin.

Further, according to the present invention, a pulse voltage is used as a power supply for driving the movable contact piece, and a load current is used as a power supply for keeping the contacts, so that there is an effect that power consumption is smaller than in the conventional example. .

[Brief description of the drawings]

1 to 4 show an embodiment of the relay according to the present invention. FIG. 1 is a plan view, FIG. 2 is an exploded perspective view, FIG. 3 is an operation explanatory view, and FIG. 4 is a time chart. It is. DESCRIPTION OF SYMBOLS 1 ... board, 2 ... iron core, 3 ... movable contact piece, 12 ... fitting hole, 4 ... drive coil part, 16, 17 ... first and second fixed contact, 18a ... printed wiring (Latching coil), 33,
34 First and second movable contacts.

Claims (1)

(57) [Claims] A substrate having a driving coil portion formed by printing in a substantially spiral shape with the fitting hole as a center, and one end fitted into the fitting hole. The movable contact provided at the free end is attached to the substrate by adsorbing and separating the intermediate portion from the projecting one end of the iron core based on the excitation and demagnetization of the drive coil portion. A movable contact piece that comes into contact with and separates from the fixed contact provided; and a latching coil section that excites one end of the iron core with a load current flowing through the movable contact piece when the movable contact comes into contact with the fixed contact on the substrate. The relay provided with.