JPS635334Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a two-wire remote control circuit for an electromagnetic relay that blinks lights in homes, offices, etc.

Conventionally, as shown in Fig. 1, the coil B of the magnetic holding type electromagnetic relay A, the auxiliary contact SW ₀ , and the operation switch SW ₁ were used.
and AC power supply E are connected in series, and the auxiliary contact SW ₀
Connect a pair of diodes D ₀₁ and D ₀₂ with opposite polarity to the normally closed and normally open contacts a ₀ and b ₀ of the operating switch SW ₁
A pair of diodes D _a and D _b with opposite polarities were also connected to the a ₁ and _B 1 terminals of the 2-wire remote control circuit. Note that a plurality of other operation switches _SW2 ... are connected in parallel to the operation switch _SW1 .

The conventional two-wire remote control circuit described above has the following drawbacks. In other words, when the c ₁ of the operating switch SW ₁ is brought into contact with the b ₁ side, a current i ₁ flows, the magnetic holding type electromagnetic relay is energized and reversed, and the auxiliary contact SW ₀ changes the c ₀ terminal from the a ₀ terminal to the b ₀ terminal. At the same time, the load contact C closes. At this time, since the diodes D ₀₂ and D _b have opposite polarities, the current i ₁ no longer flows. The magnetic retention type electromagnetic relay A continues to maintain an inverted state due to the magnetomotive force of the permanent magnet even when the excitation current is removed. In such a state, the operation switch
If SW ₁ is not reset and the C ₁ terminal is in contact with the B ₁ terminal, another person operates the operation switch SW ₂ and the C ₂ terminal is brought into contact with the _{A 2} terminal. The current flows through the coil B of the holding type electromagnetic relay A, causing a reverse operation. When operated simultaneously from multiple locations as described above, currents with opposite directions flow alternately through the magnetically held electromagnetic relay A, causing the electromagnetic relay to repeatedly reverse at extremely high speeds, making it difficult to control the lighting in some cases. In addition, in such a state, there was a risk that the load contact C would be welded.

The purpose of this invention is to improve the above-mentioned drawbacks and to provide a two-wire remote control circuit that is simple in structure and easy to install.

In FIG. 2, reference numeral 1 denotes a magnetically held type electromagnetic relay, which includes a coil 2, an auxiliary contact 3, and a load contact 4. The magnetic retention type electromagnetic relay 1 includes a permanent magnet (not shown) in the magnetic circuit. Auxiliary contact 3 contact
A ₀ and b ₀ have a pair of diodes D ₀₁ and D ₀₂ in opposite directions. Next, reference numeral 5 denotes an operation switch, which connects a full-wave rectifier circuit 6 to the DC end of the full-wave rectifier circuit 6 via a capacitor 7 to a normally open contact _a1 of a manual changeover switch 8, and a normally closed contact _b1. forms a discharge circuit for the charge of the capacitor 7 via the resistor r ₀ .
Reference numeral 9 denotes an indicator light, and a pair of light emitting diodes LED ₁ and LED ₂ are connected in parallel with the full-wave rectifier circuit 6 with opposite polarities. A plurality of operation switches 5' and 5'' are connected in parallel to this operation switch 5.

Next, the operation will be explained.

Switch the manual changeover switch 8 of the operation switch 5 from the normally closed contact _b1 to the normally open contact _a1 .

A current i ₁ flows through the capacitor 7 in the direction shown in FIG.

The coil 2 of the magnetic retention type electromagnetic relay is excited, and the auxiliary contact 3 is switched from b ₀ to a ₀ . Also, the load contacts 4 are closed.

If the capacitance of the capacitor 7 is appropriately selected, as shown in Figure 3, the capacitor 7 will be fully charged and the auxiliary contact 3 will switch from b ₀ to a ₀ , but the current in the reverse direction will be very small, and the magnetic holding type electromagnetic The relay will never flip. For example, a capacitor
It was successfully operated with a coil resistance of 47μF, magnetic retention type electromagnetic relay 1, approximately 100Ω, and a current of 24V AC.
In FIG. 3, v ₀ represents the voltage across the capacitor 7, and i ₁ represents the charging current of the capacitor.

Next, when you stop pressing the manual switching contact 8,
The normally open contact a ₁ returns to the normally closed contact b ₁ and the charge in the capacitor 7 is discharged via the resistor r ₀ .

When the auxiliary contact 3 is at _b0 , a current _i2 flows through the light emitting diode LED ₁ of the indicator light 9, indicating that the load contact is open. The reversal of the auxiliary contact 3 from b ₀ to a ₀ causes current i to flow through the LED ₂ , indicating that the load contact 4 is closed.
Note that since the resistor r is connected in series, the current
i ₂ and i ₃ are small and will not reverse the magnetic retention type electromagnetic relay.

When the manual changeover switch 8 is switched again to the normally open contact A ₁ side, the charging current i' ₁ flows through the capacitor 7, the magnetic holding type electromagnetic relay 1 is energized, and the auxiliary contact 3 is switched from A ₀ to B ₀ . Load contacts 4 are opened. Even when the auxiliary contact 3 switches from a ₀ to b ₀ , since the capacitor 7 is almost fully charged, only a small amount of the charging current i' ₁ flows and does not reach the point where the magnetically held electromagnetic relay 1 is reversed.

Next, to explain the case where the manual changeover switches 8 and 8' of the operation switches 5 and 5' are operated almost simultaneously, when the manual changeover switch 8 of the operation switch 5 is switched to the normally open contact _A1 side, the capacitor 7
Since charging is completed in approximately half a cycle, approximately 8~
It will charge in 9 milliseconds.

In other words, even if two or more operations are performed at the same time, it is considered that such a thing almost never occurs in practice. Therefore, the capacitor of which the manual changeover switch 8 is switched to the normally open contact side a ₁ or a ₂ is charged quickly. For example, if the manual changeover switch 8 is operated first, the magnetic holding type electromagnetic relay 1 is reversed. When the manual changeover switch 8' is operated in succession, the magnetic holding type electromagnetic relay 1 is reversed again. At this time, even if the manual changeover switch 8 is continued to be operated, no charging current will flow because the capacitor 7 has already been charged. In other words, when a plurality of operation switches are operated almost simultaneously, the state of the operation switch operated last is stable.

As described above, according to the present invention, the auxiliary magnetically held type electromagnetic relay is provided with a pair of diodes connected to the coil, the normally closed contact, and the normally open contact of the magnetically held type electromagnetic relay so as to have mutually opposite polarities. contact and
A full-wave rectifier circuit and an AC power supply are connected in series, and a normally open contact of a switch having a capacitor connected in series is connected to the DC output end of the full-wave rectifier circuit, and the charge of the capacitor is connected to the normally open contact of the switch. Since it is a two-wire remote control circuit that discharges at the closed contact, the capacitor will be fully charged within about half a cycle even if the manual changeover switches 8 and 8' of operation switches 5 and 5' are operated almost simultaneously. As a result, there is no risk that the magnetic holding type electromagnetic relay will repeat reversals as in the conventional case, and there is no risk that the load contacts will weld.

Furthermore, since the operating switch is provided with a full-wave rectifier circuit 6, the charging direction of the capacitor 7 is unidirectional regardless of whether the auxiliary contact 3 of the magnetically held relay 1 is on the a ₀ or b ₀ contact side, and the manual changeover switch 8 need only be changed at all, and no other means for switching the current direction of the charging current to the capacitor 7 is required, which has the effect of providing an operating switch with a simple configuration.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit diagram of a conventional two-wire remote control circuit corresponding to the present invention, and Fig. 2 is an electric circuit diagram of a conventional two-wire remote control circuit corresponding to the present invention.
FIG. 3 is an electric circuit diagram showing an embodiment of the wire remote control circuit, and is a voltage and current waveform diagram showing the charging voltage and charging current of the capacitor 7. 1...Magnetic retention type electromagnetic relay, 2...Coil,
3... Auxiliary contact, 4... Load contact, 5... Operation switch, 6... Full wave rectifier circuit, 7... Capacitor, 8... Manual changeover switch, 9... Indicator light.

Claims (1)

[Scope of utility model registration request] an auxiliary contact of the magnetically holding type electromagnetic relay comprising a pair of diodes connected to a coil of the magnetically holding type electromagnetic relay and a normally closed contact and a normally open contact so as to have mutually opposite polarities, and a full wave rectifier circuit; An alternating current power source is connected in series, and a normally open contact of a switch having a capacitor connected in series is connected to the direct current output end of the full wave rectifier circuit, and the electric charge of the capacitor is discharged at the normally closed contact of the switch. A two-wire remote control circuit characterized by: