JPS6111873Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a remote control circuit for an electromagnetic relay used in a system in which indoor lighting can be turned on and off using switches installed in multiple locations.

Conventionally, as shown in Fig. 1, the coil B of a magnetically held type electromagnetic relay A, the switching type auxiliary contact C of this magnetically held type electromagnetic relay A, and both fixed contacts a and b of this auxiliary contact C are connected with opposite polarity to each other. The operation switch F has two diodes D ₁ and D ₂ and both fixed contacts e and f are both open at all times, and both fixed contacts e,
The circuit consisted of two diodes D ₃ and D ₄ connected to f with opposite polarities and connected in series to an AC power source E. In addition, since it may be operated in other locations, the operating switch F and both fixed contacts e and f are connected.
A switch consisting of two diodes D ₃ and D ₄ connected in series so that the polarities are opposite to each other.
Switches SW ₂ , SW ₃ . . . having the same configuration as SW ₁ are connected in parallel. Note that G is an output contact of the magnetically held type electromagnetic relay A to which a load L such as a lighting lamp is connected. Note that LEDs to LEDn are indicator lights that indicate the operating status of the magnetically held type electromagnetic relay.
FIG. 2 shows an example of a magnetically holding type electromagnetic relay A, in which H is an iron core around which a coil C is wound, and one end of which is connected to a yoke J. K is a permanent magnet, and one end is connected to a yoke J, and the other end is connected to a support plate M that rotatably supports a movable iron piece L. N is the terminal.

In the case of the conventional example described above, when the operation switch F of switch SW ₁ is connected to the fixed contact e side, current i ₁ flows and coil B of the magnetically holding type electromagnetic relay A is energized, the auxiliary contact C is reversed, and the fixed contact a Since the sides are closed and the directions of diode D ₁ and diode D ₄ are reversed, current i ₁ no longer flows. The magnetic holding type electromagnetic relay A maintains an inverted state even if the current i ₁ stops flowing due to the magnetic flux of the permanent magnet K. However, if the operating switch F' of another switch SW ₂ is connected to the fixed contact f' side while the operating switch F is connected to the fixed contact e side, a current i ₂ flows and the magnetic holding type electromagnetic relay A The auxiliary contact C is reversed again and the fixed contact b side is closed. As mentioned above, if the operation switch is operated at two locations at the same time, the magnetic holding type electromagnetic relay A will repeatedly reverse at high speed and generate noise, and the output contact G will open and close the load frequently, leading to the risk of welding or burnout. Ta.

In addition, in order to omit the auxiliary control point of the magnetic holding type electromagnetic relay and the diode connected in series to this auxiliary contact, a capacitor is connected in series with the coil of the magnetic holding type electromagnetic relay as shown in Figure 4. It has been proposed that the magnetic holding type electromagnetic relay is energized and reversed using the charging current until charging is completed, but even in this case, if two operating switches are pressed simultaneously, the capacitor C There remains a possibility that the charging direction of the battery will change alternately and that high-frequency reversals similar to the conventional example shown in FIG. 1 will be repeated. In addition, in the conventional example shown in Fig. 5, the electric charge stored in the capacitor C is switched.
SW ₀ is pressed to cause discharge through coil B' of the magnetic holding type electromagnetic relay, and the discharge current is reversed by i ₀ . The auxiliary contact switches and the capacitor C is charged in the opposite direction, so when the switch SW ₀ is closed again, the current i ₀ ' flows in the opposite direction and is reversed, but the moment the auxiliary contact switches, the capacitor C charges in the opposite direction. The initially charged charge is rapidly discharged, and a current in the opposite direction flows through the coil, making the reversal of the magnetically held electromagnetic relay unstable and causing other electrical charges connected in parallel with switch SW ₀ to become unstable. When the switch SW ₀ ' is operated, the switch SW ₀
If the capacitor C is not charged (in the case of simultaneous operation), the current i ₀ will be small and there is a risk that the magnetic holding type electromagnetic relay will not reverse.

The present invention improves the above-mentioned drawbacks and provides a remote control circuit for an electromagnetic relay in which the magnetically held type electromagnetic relay does not reverse frequently even when operating switches are operated at multiple locations simultaneously.

A detailed explanation will be given below according to the drawings. In FIG. 3, 1 is a magnetic holding type electromagnetic relay, 2 is a coil, 3 is a switching type auxiliary contact, and 4 is an output contact. Two diodes D ₁ and D ₂ are connected to both fixed contacts a and b of the auxiliary contact 3 so as to have opposite polarities. 5, 5', 5'' are switches that are mounted on a wall, etc., and operation switches 6,
capacitors C ₁ , C ₂ , C ₃ are connected in series to the normally closed side fixed contact b of the operating switch 6 through the resistor r, and the capacitor C and the resistor r are connected to the switching contact. connected in series through the normally closed side of
The normally open side of the switching contact is connected to its control terminal via the light emitting diodes LEDn ₁ and LEDn ₂ facing in opposite directions, and the collector and emitter thereof are connected to the capacitor C,
It consists of two switching elements S ₁₁ and S ₂₁ of different polarities connected in parallel to a series circuit consisting of a resistor r and the normally closed side of a switching contact.

Therefore, the state shown in Fig. 3 is changed to the magnetic holding type electromagnetic relay 1.
When the output contact 4 of is in the open state, when the operating switch 6 is operated to switch from the normally closed fixed contact b to the normally open fixed contact a, the charge on the capacitor C will be
A current i ₁ is passed through the control terminal of the switching element S ₁₂ through the LED ₁₂ , and a current i ₂ is supplied from the power source E to excite the coil 2 of the magnetically holding type electromagnetic relay, so the magnetically holding type electromagnetic relay is reversed and the auxiliary contact is activated. 3 switches from fixed contact b to fixed contact a. Then, the output contact 4 is closed and the load L, for example, a lighting lamp is turned on.
At this time, as shown in Fig. 6, the polarity is such that a current iα flows in the opposite direction to the capacitor C, but due to the presence of the diode _D12 , the current iα
does not flow, but discharges in the direction of the current iβ, and the magnetic holding type electromagnetic relay 1 completely completes reversal. Note that the diode diagram indicated by the dotted line in the figure shows an NPN type switching element.

Even if you continue to operate the operation switch 6 in this state, it will not affect the magnetically held type electromagnetic relay 1 in any way.
In this state, when the operating switch 6' is connected to the fixed contact side a', the switching element S'2 becomes conductive, and a current _i3 flows, and the magnetically held type electromagnetic relay 1 is reversed again. In other words, it is a type that gives priority to the last operation, which stabilizes in the direction of the last operation.

As mentioned above, according to the remote control circuit of the electromagnetic relay of the present invention, the coil of the magnetic holding type electromagnetic relay,
Two diodes connected with opposite polarities to both fixed contacts of the switching type auxiliary contact of this magnetic retention type electromagnetic relay, and the normally closed contact of the operation switch are connected to the positive and negative waves of the AC power supply, which are connected in opposite directions to each other. and two switching elements having opposite polarities that are controlled by the charged charge of the capacitor supplied through the normally open contact of the operation switch. a switching element, a coil of the magnetic retention type electromagnetic relay, a switching type auxiliary contact of the magnetic retention type electromagnetic relay, and two diodes connected with opposite polarities to both fixed contacts of the switching type auxiliary contact; Since the series circuit of the electromagnetic relay is connected to the AC power supply as a remote control circuit, even if the operation switch 6 is continued to be operated and the other operation switch 6' is operated, the result shown in FIG. There is no risk that the magnetic holding type electromagnetic relay 1 repeats frequent opening and closing as in the conventional example shown, and the reversal direction is always determined by the last operating switch operated. Therefore, if this operating switch is not operated manually but is used with an output contact for other electrical equipment such as a photoelectric automatic blinker or an automatic time switch, the contact may be turned on for a long period of time on the normally open contact side. However, even in such a method of use, in the case of the circuit of the present invention, there is no risk that the magnetic holding type electromagnetic relay will open or close frequently even if other switches connected in parallel are operated. Therefore, there is no possibility that the output contacts will be welded or burned out.

In addition, the currents i ₂ and i ₃ that drive the magnetically held electromagnetic relay 1 do not flow through the changeover switch.
An extremely small contact point is sufficient, and it can also be miniaturized.

Therefore, it is extremely effective as an operating circuit for an electromagnetic relay in a system in which indoor lighting lights are operated from multiple locations.

It goes without saying that the present invention is not limited to the above-mentioned embodiments, and that various configurations are possible within the scope of the gist of the present invention.

[Brief explanation of the drawing]

1, 4 and 5 are electric circuit diagrams showing a conventional example, FIG. 2 is a side view of a magnetic holding type electromagnetic relay, and FIG. 3 is an electric circuit diagram showing an embodiment of the present invention. FIG. 6 is an electrical circuit diagram showing the operating state of the present invention. 1...Magnetic retention type electromagnetic relay, 2...Coil,
3... Auxiliary contact, 4... Output contact, 5... Switch, 6... Operation switch, D ₁ to D ₂ , Dn ₁ to
Dn ₃ ... diode, Sn ₁ , Sn ₂ ... switching element, LEDn ₁ , LEDn ₂ ... light emitting diode.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Two diodes connected with opposite polarities to the coil of a magnetic retention type electromagnetic relay and both fixed contacts of the switching type auxiliary contact of this magnetic retention type electromagnetic relay, and two diodes for operation. It is controlled by a capacitor that is charged in opposite directions by the positive wave and negative wave of the AC power supply through the normally closed contact of the switch, and the charged charge of the capacitor that is supplied through the normally open contact of the operating switch. two switching elements of opposite polarity, a coil of the magnetic retention type electromagnetic relay, a switching type auxiliary contact of the magnetic retention type electromagnetic relay, and the switching type A remote control circuit for an electromagnetic relay, characterized in that a series circuit with two diodes connected with opposite polarities to both fixed contacts of an auxiliary contact is connected to an alternating current power source. (2) A feature characterized in that the two switching elements are an NPN transistor and a PNP transistor, and the base of the transistor and the normally open fixed contact of the operating switch are connected by diodes with opposite polarities. A remote control circuit for an electromagnetic relay according to claim 1.