JP2886582B2 - Switch with display - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch with a display having a display for displaying an operation state of a load by a circuit current.

[Prior Art] In a conventional switch with a display of this type, as shown in FIG. 9, when an open / close mechanism is turned on and AC power AC is supplied to a load L via a switch A, the open / close mechanism 1 LED connected in anti-parallel by a voltage induced in a secondary winding of a current transformer T having a primary winding connected in series
The indicator 4 made of LD is turned on to display the operating state of the load L.

[Problems to be Solved by the Invention] However, in the switch with the display, the current transformer is expensive and has a large shape, so that there is a problem that the shape of the switch itself becomes large.

The present invention has been made in view of the above points, and an object of the present invention is to provide a low-cost, small-sized switch with a display.

Means for Solving the Problems In order to achieve the above object, the present invention provides a constant voltage circuit including a plurality of diodes connected in series and a plurality of diodes connected in series connected in antiparallel to the plurality of diodes. Are connected in series to an opening / closing mechanism that opens and closes a contact in accordance with a switching operation, and the above-mentioned display including a plurality of light-emitting diodes connected in antiparallel is connected to both ends of the constant voltage circuit.

[Operation] The present invention opens and closes a contact according to a switching operation of a constant voltage circuit including a plurality of diodes connected in series and a plurality of diodes connected in series connected in anti-parallel with the plurality of diodes as described above. By connecting the indicator consisting of a plurality of light emitting diodes connected in series and antiparallel to both ends of the constant voltage circuit, both ends of the constant voltage circuit are operated at the time of load operation in which circuit current flows. A constant voltage is generated by the voltage drop of the diode, and the display is turned on with this constant voltage so that the display can be turned on without using a large and expensive member such as a current transformer. It was done.

[Embodiment] FIGS. 1 to 8 show an embodiment of the present invention. As shown in FIG. 1, the switch with a display according to the present embodiment has a bidirectional constant voltage circuit 2 configured by connecting a plurality of diodes D connected in series in anti-parallel to the switching mechanism 1 in series. A display 4 composed of light emitting diodes LD connected in anti-parallel via a current limiting resistor 3 is connected to both ends of the bidirectional constant voltage circuit 2.

The reason why the bidirectional constant voltage circuit 2 is provided in the present embodiment will be described below. Light-emitting diodes that are currently produced are forward current I _F is the absolute maximum rating of about 10～50MA, a display 4 made of a light-emitting diode LD which is connected in anti-parallel as shown in FIG. 10 to the opening and closing mechanism 1 When directly connected (as proposed in Japanese Utility Model Application Publication No. 53-52368),
The current range that the switch can use is up to 50 mA,
A 100V circuit can only be used up to 5W (100V x 50mA). Therefore, when used as a switch for ordinary lighting, a ventilation fan, or the like, the field of use is extremely reduced. Also, when an overload is applied, the light emitting diode LD is easily broken.
In contrast, are commercially available in a forward current I _F of about 10A is a diode, the voltage-current characteristics of the diode D in the circuit shown in FIG. 2 (a) measuring, FIG. 2 (b)
It becomes as shown in. That is, as shown in FIG. 2B, the diode D exhibits a constant voltage characteristic in which the voltage does not increase so much even when the current increases. Therefore, in the present embodiment, the bidirectional constant voltage circuit 2 is configured using the diode D having such characteristics, and a constant voltage is applied to the display 3 including the light emitting diode LD via the current limiting resistor 3. It is.

FIGS. 3 to 8 show a switch including the circuit having the above configuration. The casing 5 of the switch is composed of a base 6 and a cover 7, and has a structure in which the base 6 and the cover 7 are integrally combined by a connecting bracket 8. The cover 7 has a box shape with an open lower surface, and an opening 9 for exposing the handle 10 is formed on the upper surface. The base 6 has a box shape with an open upper surface, and has an electric wire insertion hole 14 and a release hole 15 for inserting electric wires on both sides of the lower surface as shown in FIG. Correspondingly, an electric wire connection device having a quick connection structure comprising a terminal plate 11, a lock spring 13 and a release button 12 is stored respectively. Here, one terminal plate 11
₁ has a contact piece 11a to which a fixed contact 19 is fixed. Further, an inverter 16 formed in the base 6 in a substantially U-shape and having a movable contact 17 formed on one outer surface, and the inverter 16 is mounted on a support projection 18a so that the inverter 16 can swing. And a supporting bracket 18 to be supported. Bidirectional constant-voltage circuit 2 consisting of a plurality of diodes D described above Yes constituted by mounting a diode D on the printed circuit board 2 is accommodated in the base 6, the terminal plate 11 ₂ and the lead wires 31 and 32 Support bracket 18
Connected to each other.

The handle 10 has a box shape opening downward, and a printed circuit board 21 on which a light emitting diode LD and a current limiting resistor 3 are mounted on the lower surface of the opening.
(See Fig. 5)
A light transmitting window 22 for transmitting the light of the LD is formed. here,
The light emitting diode LD and the resistor 3 are connected to the bidirectional constant voltage circuit 2 formed on the printed circuit board 20 by the lead wire 30. A swing fulcrum 10a for attaching the handle 10 to the base 6 in a seesaw manner is formed on both sides in the width direction of the handle 10. Further, a protrusion 10b is protruded from the upper bottom surface of the handle 10, and a reversing spring 23 having an upper end fixed by the protrusion 10b is attached with the lower portion thereof housed in the reversing element 16.

In this switch, when one end of the handle 10 is pressed, the handle 10 rotates about the swing fulcrum 10a, and at this time, a force that bends in the opposite direction to the reversing spring 23 is exerted on the reversing spring 23.
16 rotates about the support protrusion of the support bracket 18 as a fulcrum, and the contact 1
7,19 are opened and closed. In the state where the contacts 17 and 19 are closed as shown in FIG.
The voltage is supplied through the path of the bidirectional constant voltage circuit 2, the support bracket 18, the inverter 16, the other electric wire connection device, and the load L. Therefore, a voltage is generated in the constant voltage circuit 2, and the light emission of the display 4 is caused by the voltage. The diode LD lights up. Conversely, when the contacts 17, 19 are opened, the path is opened, and no voltage is generated in the constant voltage circuit 2, so that the light emitting diode LD is turned off.

[Effect of the Invention] As described above, according to the present invention, a constant voltage circuit including a plurality of diodes connected in series and a plurality of diodes connected in series connected in anti-parallel to the plurality of diodes is contacted according to a switching operation. The display is composed of a plurality of light-emitting diodes connected in series to an opening / closing mechanism that opens and closes, and is connected to both ends of the constant voltage circuit. A constant voltage is generated at both ends of the circuit by the voltage drop of the diode, and the indicator can be turned on with this constant voltage. Therefore, there is no need to use a large and expensive member such as a current transformer, and the display is small and inexpensive. Switches can be configured.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of one embodiment of the present invention, and FIG.
(B) is an explanatory view of a constant voltage circuit, FIG. 3 is a perspective view of a switch having the same, FIG. 4 is an exploded perspective view showing a state in which a cover and a handle are removed, and FIG. FIG. 6 is a sectional view of a switch, FIG. 7 is a plan view of a base, FIG. 8 is a plan view of a state where members are stored in a base, FIG. 9 is a circuit diagram of a conventional example, FIG. Is a circuit diagram of another conventional example. 1 is an opening / closing mechanism, 2 is a constant voltage circuit, and 4 is a display.

Claims (1)

(57) [Claims] 1. A constant voltage circuit comprising a display for displaying an operation state of a load by a circuit current, comprising a plurality of diodes connected in series and a plurality of diodes connected in series connected in anti-parallel with the plurality of diodes. A switch with a display, wherein the switch is connected in series to an opening / closing mechanism that opens and closes a contact in accordance with a switching operation, and the display including a plurality of light emitting diodes connected in anti-parallel is connected to both ends of the constant voltage circuit.