JP3057806B2 - Switch with indicator light - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch with an indicator light for confirming the operation state of a load.

[0002]

2. Description of the Related Art Conventionally, in this type of switch with an indicator light, a current transformer is inserted and connected to a main circuit, and an output is obtained from a secondary side of the current transformer in accordance with the magnitude of a load current. The display element was turned on.

[0003]

In such a conventional example, the current transformer is used, which increases the manufacturing cost. Further, since the current transformer has a different secondary current depending on the magnitude of the primary current, the current transformer is not used. There was a problem that the brightness changed.

The present invention has been made in view of the above points, and has as its object to provide a switch with an indicator light for reducing a change in brightness of a display element due to a magnitude of a load current. is there.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In the first aspect of the present invention, a diode bridge circuit and
A forward connection is made between the DC output terminals of the diode bridge circuit.
Rectifier block consisting of another diode connected and switchgear
AC power is connected via a switch and load
Block which is integrally formed with the display block of connecting the light emitting diode between the AC input ends of the serial diode bridge circuit
Comprising a part, be those well as OsameSo the opening and closing mechanism portion in the accommodating portion of the body of the switch body of the cover and the body was OsameSo the block portion in the housing portion of the handle
The size of the above switch body in a standardized mounting frame
Formed to the size of one of the corresponding wiring module
In addition, on both sides of the switch body,
A locking claw that detachably locks on the frame is projected.
And According to a second aspect of the present invention, there is provided the method according to the first aspect.
The rectifying block and the display block
It is a molded block that is integrally formed with the
Sign.

[0006]

[Operation] The light emitting diode of the display block is illuminated with a small change in brightness by utilizing the voltage drop of the rectifying block, and the printed circuit board on which the rectifying block is mounted and the opening / closing mechanism are connected. Are separated into a body and a handle to ensure insulation, and the printed circuit board is resin-molded to prevent disconnection of the lead wire and peeling of the pattern due to shock or vibration.

[0007]

FIG. 1 is a circuit diagram of a switch body A. The electrical circuit configuration is composed of a rectifying block 1, a display block 2, and a switch SW of an opening / closing mechanism.

The rectifying block 1 includes diodes D1 to D4.
And a diode bridge circuit consisting of
Connect in a forward direction between the DC output terminals of the ridge circuit.
And a diode D5.

The display block 2 is connected in parallel in the reverse direction.
LED1 and LED2 and a protection resistor R
It is composed of

The display block 2 is a rectifying block 1
Connected to the input / output terminals of the Note that a choke coil may be used instead of the protection resistor R.

The switch body A is interposed between a power supply V and a load L. Now, when the switch section SW is ON, the diodes D1 to D5 are alternating current power sources, so that a current in a solid line direction and a current in a broken line direction flow alternately.

That is, in the positive half cycle of the AC power supply, as shown by the solid arrow, the diodes D1 → D5 → D3
→ The current flows through the load L, and in the negative half cycle, the current flows through the load L. In the negative half cycle, the current flows through the load L → the diode D4 → D5 → D2.

Since the voltage drop of the diodes D1 to D5 is substantially constant without being greatly affected by the load current, a constant potential difference always occurs between a and b.

Therefore, since the potential difference between a and b supplies a substantially constant current to the light emitting diodes LED1 and LED2, the brightness of the light emitting diodes LED1 and LED2 does not change much and the brightness is substantially constant. It will be.

Here, the forward voltage drop per diode is about 0.7V.

The forward voltage drop of the light emitting diode is, for example, about 1.8 V in the case of a gallium phosphorus element.
In the case of a gallium aluminum arsenic element, the light emitting diodes LED1, LED1
In order to pass a current through 2, a series connection of three diodes is required.

In the present invention, as shown in FIG.
When 1 to D5 are connected, a current in the same direction flows through the diode D5 regardless of the direction of the load current, so that a total of five diodes is sufficient.

However, when a series circuit of three diodes is connected in parallel as shown in FIG. 2 to turn on the light emitting diodes, a total of six diodes are required.

That is, by connecting as shown in FIG. 1 of the present invention, the number of diodes can be reduced by one.

By the way, in the case of a switch with a built-in semiconductor,
It is conceivable that the element breaks down and becomes non-conductive due to factors such as an inrush current at power-on, an induced lightning surge induced on the power line, and electrostatic discharge received by a person during operation.

FIG. 3 shows each of the diodes D1 to D in the circuit of FIG.
5A shows a current waveform, FIG. 5A shows a load current, FIG. 5B shows a current of diodes D1 and D3, and FIG.
2D shows the current of D3, and FIG. 4D shows the current of the diode D5.

Since the current flows through the diode D5 for both half cycles as compared with the other diodes D1 to D4 in which the current flows only in one half cycle, the diode D5
5 has a high probability of becoming non-conductive due to failure.

When the diode D5 becomes non-conductive, the entire rectifying block 1 becomes non-conductive, and all the load current flows to the display block 2.

This is because the load current is light emitting diode LED
Switch body A without any trouble as long as it is within the rating of 1, LED2
Can be used, but if it is higher than the rating, the light emitting diodes LED1 and LED2 break down and the switch body A becomes non-conductive.

In this regard, in the case of the circuit shown in FIG. 2 in which a plurality of diodes are simply connected in series and parallel, the probability that all of the diodes D1 to D6 fail is constant, and if the diode D1 fails and the load increases. If the current is equal to or higher than the rating of the light emitting diodes LED1 and LED2 and the light emitting diodes LED1 and LED2 fail, a half-wave rectified current flows as indicated by a broken line in the circuit.

The rated current of the light emitting diode is several tens of meters.
Since the load current is as small as A, the load current is usually higher than the rated current in most cases.

In such a state, the load L is adversely affected, and in the worst case, the load L may be damaged or burnt out, which is dangerous.

However, according to the circuit configuration shown in FIG. 1 of the present invention, as described above, there is a high probability that the entire switch main body A becomes non-conductive, and a failure occurs in a safe mode.

FIG. 4 shows a comparison between the load current of the switch body A of the present invention and a conventional switch with a built-in current transformer and the brightness of the light emitting diode.

As is apparent from FIG. 4, the change in brightness of the switch body A of the present invention is smaller than that of the current transformer type regardless of the magnitude of the load current.

The resistance value of the protective resistor R is suitably about 100Ω when the light emitting diode is a gallium-phosphorous element, and about 400Ω when the light emitting diode is a gallium aluminum arsenide.

Also, when a choke coil is used instead of the protection resistor R, the inductance is set so that the impedance becomes equivalent at the commercial frequency.

Next, a specific configuration of the switch body A will be described with reference to FIGS. The outer shell of the switch main body A is composed of a body 4 and a cover 5, and terminal portions 6 connected to external electric wires are formed on both sides of the body 4, respectively.

The terminal portion 6 comprises a substantially U-shaped terminal plate 7, a locking spring 8 for press-connecting a conductor of an electric wire to the terminal plate 7, and a release button 9 for releasing the electric wire.

An electric wire insertion hole 10 for inserting an electric wire and a release hole 11 for inserting a tip of a driver or the like to press the release button 9 are formed in the bottom of the body 4.

A rib 12 made of an insulating material is integrally protruded from a substantially central portion of the body 4, and a storage portion 13 is formed with the rib 12 as a boundary.

The storage unit 13 is provided with an opening and closing mechanism.
That is, the support plate 15 electrically connected to the one terminal plate 7 is disposed at the bottom of the storage portion 13, and the substantially U-shaped opening / closing body 17 is swingable on the protrusion 16 formed on the support plate 15. Are located in

A movable contact 18 is fixed to one side surface of the opening / closing body 17.
9 is provided on the other terminal plate 6.

A handle 21 is provided in the opening 20 of the cover 5, and a spring 26 mounted on the lower surface of an actuator 22 protruding from the lower surface of the handle 21 abuts on the upper end of the opening / closing body 17. The open / close body 17 is operated in a seesaw operation by the seesaw operation to open and close the contacts 18 and 19.

The contacts 18 and 19 constitute a switch section SW shown in FIG. Storage section 14 of handle 21
Inside, the printed circuit board 23 on which the diodes D1 to D5 of the rectifying block 1 and the protection resistor R are mounted and the printed circuit board 25 of the display 24 on which the light emitting diodes LED1 and LED2 of the display block 2 are integrated are molded with resin 41. A mold block 42 is provided.

Then, the printed circuit board 25 is connected to the lead wire 29.
Connected by Here, a groove 28 is formed in the printed board 25, and the lead wire 29 is fixed to the groove 28 by slightly slackening from the soldered portion at the end of the lead wire 29.

This is to prevent the soldered portion of the lead wire 29 from breaking even when the handle 21 is inverted.

Since the printed circuit board 23 is molded with the resin 41, disconnection due to shock, vibration, and the like is prevented.

Printed circuit board 25 fixed to handle 21
Is positioned corresponding to the display hole 30 of the handle 21 so that the load state can be visually recognized from the outside of the handle 21.

Here, the switch body A of the present invention is formed in the size of one standardized wiring appliance module, and is detachably mounted on a standardized mounting frame. I have.

Locking claws 31 are provided on both sides of the cover 5 so as to protrude sideways for mounting on the mounting frame.

FIG. 9 is an exploded perspective view showing a case where the switch body A is mounted on a plate frame 32 which is a mounting frame.
The size is such that three switch bodies A each having the size of the unit can be mounted.

The body 4 and the cover 5 of the switch body A
Are joined by an assembly frame 33, on which the above-mentioned locking claws 31 are formed.

A pair of locking holes 34 into which the pair of locking claws 31 of the switch body A are inserted and locked are formed in one side piece of the plate frame 32.

The other side piece of the plate frame 32 is integrally formed with a flexible piece 35 which can be bent laterally. Are inserted and locked, so that the switch body A is detachably mounted on the plate frame 32.

The plate frame 32 has a mounting hole 36 for screw insertion for mounting to a switch box embedded in the wall surface.

The decorative plate 3 is provided on the front of the plate frame 32.
7 is provided, and an engaging claw 38 is protruded from the rear surface. The engaging claw 38 is fitted into an engaging hole 39 of the plate frame 32 so that the decorative plate 37 is attached to the plate frame 32. It is detachably attached.

An opening 40 for exposing the handle 21 of the switch body A is formed in the decorative plate 37.

[0054]

According to the first aspect of the present invention, as described above,
Bridge circuit and direct current of the diode bridge circuit
A rectifying block consisting of another diode connected in the forward direction between the output terminals, and a switch of the opening / closing mechanism and a load.
AC of the diode bridge circuit to which the power supply is connected
Comprising a block portion which is integrally formed with the display block of connecting the light emitting diode between the input terminals, as well as OsameSo the opening and closing mechanism portion in the accommodating portion of the body of the switch body of the cover and the body, above storage portion of the handle It is one with a block part installed .

Therefore, by using the voltage drop of the rectifying block to light the light emitting diodes of the display block with a small change in brightness, the light emitting diode can be manufactured at a lower cost than the conventional one using a current transformer.

Further, since the light emitting diode is turned on using the voltage drop of the diode, the change in brightness of the light emitting diode due to the magnitude of the load current is small.

[0057] In addition, Sui and block part, the opening and closing mechanism
The switch body separately on the handle side and the body side.
The switching mechanism and rectifying block through which a large load current flows
Ru can be secured insulation between the click. Further, the above switch
Wiring device corresponding to the mounting frame where the size of the switch body is standardized
The size of one switch module
Removable on the mounting frame on both sides of the main body facing outward
The locking claw that locks to the projection is projected, so the standardized mounting frame
Can be attached to the wiring module
Together with the same mounting frame as other wiring
It is also possible to set up.

Further, according to the invention of claim 2, the block portion is
The rectifying block and the display block are integrally formed.
Since it is a molded block, breakage of the lead wire and peeling of the pattern due to impact or vibration are prevented, and the quality is stabilized.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of one embodiment of the present invention.

FIG. 2 is an explanatory view of the above.

FIG. 3 is an operation waveform diagram of the above.

FIG. 4 is a characteristic diagram showing load current and brightness of a light emitting diode according to the first embodiment;

FIG. 5 is a cross-sectional view of the switch body.

FIG. 6 is a plan view showing a state in which the cover is removed.

FIG. 7 is a perspective view of a main part of the above.

FIG. 8 is a front view of a main part of the above.

FIG. 9 is an exploded perspective view showing the construction state of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rectification block 2 Display block 4 Body 5 Cover 13 Storage part 14 Storage part 21 Handle 24 Display body 42 Mold block

Claims (2)

(57) [Claims] A diode bridge circuit and the diode
A separate forward connection between the DC outputs of the bridge circuit
A rectifying block composed of an ion and a switch for the opening / closing mechanism
The above diode to which AC power is connected via switch and load
A switch unit including a cover and a body is integrally provided with a block unit integrally formed with a display block in which a light emitting diode is connected between AC input terminals of a bridge circuit.
In addition to OsameSo the opening and closing mechanism, be one obtained by OsameSo the block portion in the housing portion of the handle, the scan
Adjust the size of the switch body to correspond to the standardized mounting frame.
A wire instrument module, and
Attach to the mounting frame on both sides of the switch body facing outward
A switch with an indicator light characterized by protruding locking claws for locking freely . 2. The rectifying block according to claim 2, wherein the rectifying block includes the rectifying block.
It is a mold block integrally formed with the display block
The switch with an indicator light according to claim 1, wherein: