JP5621396B2 - Switch with position indicator - Google Patents

Description

  The present invention relates to a switch with a position indicator lamp that illuminates and displays an operation knob of a switch of a switch (flashing device) provided on a low piezoelectric road of a building when the switch is opened.

  Light emitting diodes (hereinafter referred to as “LEDs”) are currently used in many electronic devices because of their low power consumption, long life, and small size. In recent years, LED bulbs are rapidly spreading as lighting fixtures that replace incandescent bulbs whose production has been discontinued to reduce carbon dioxide emissions.

  A switch with a position indicator lamp (so-called firefly switch) includes a light emitting element that illuminates an operation knob of the switch from the inside when the switch is opened, and a neon tube is frequently used as the light emitting element. When the switch is provided as a lighting switch for a building, the position indicator lamp is turned off when the luminaire is turned on, and the position indicator lamp is turned on when the luminaire is turned off. Therefore, since the installation location of the switch of the lighting fixture can be known even in a dark place, it is widely used in stores and houses.

FIG. 4 is a diagram of an illumination lighting circuit using a switch with a position indicator lamp that has been widely used conventionally. In FIG. 4, the switch is off and the neon tube is lit.
4, the input terminal 1 is connected to a commercial AC power source E (AC 100V), and the output terminal 2 is connected to a load L (lighting fixture). In the current path 12 between the input terminal 1 and the output terminal 2, a switch S1, a neon tube NL, and a resistor R1 are provided in parallel. When the switch S1 is turned off, a current I (hereinafter referred to as “indicator lighting current”) flows through the neon tube NL and lights up. At this time, the indicator lamp lighting current I also flows through the load L, but a conventional incandescent bulb or fluorescent lamp is used for the load L as a lighting fixture, and even if the indicator lamp lighting current I of about 0.3 mA flows. It did not light up.

However, in recent years, there has been a user's request to use an energy-saving lamp for the load L, and LED lighting fixtures and LED bulbs are increasingly used for the load L in FIG. Some LED lighting fixtures and LED bulbs light slightly when a display lamp lighting current I of about 0.3 mA flows. Therefore, there has been a problem that the lighting fixture (load L) does not disappear even when the switch S1 is turned off.
Therefore, conventionally, a switch with a position indicator lamp that solves the above problem and an illumination unit using the switch have been proposed (for example, Patent Document 1).

JP 2009-295463 A

The switch with a position indicator lamp in Patent Document 1 uses a three-way switch as a one-way switch so that the indicator lamp lighting current does not flow to the lighting fixture when the switch is turned off. Thereby, the problem that the lighting fixture does not disappear when the switch is turned off can be solved.
However, since the switch with a position indicator lamp diverts a three-way switch to a one-way switch, the three-way switch cannot be used for blinking lighting fixtures from a plurality of locations, which is the original purpose. It was.
Further, the switch with a position indicator lamp of Patent Document 1 is configured to open and close a weak indicator lamp lighting current of about 0.3 mA at a main circuit contact having a large capacity (for example, 15 A rating). When an oxide film is formed, contact failure easily occurs, and the effect of removing the oxide film due to sparks at the time of opening and closing cannot be expected. Therefore, there is a problem that a switch with a position indicating lamp that can withstand actual use cannot be obtained.

  This invention solves the above-mentioned fault, and it aims at providing the switch with a position indicator lamp which lights a lighting fixture selectively according to ON / OFF of a switch.

The switch with a position indicator lamp of the present invention comprises an input terminal connected to a power source, an output terminal connected to a load, and a third terminal connected to the power source, and when the main circuit contact for opening and closing the load current is off. A switch with a position indicator for turning on a position indicator, a potential difference determining means for detecting a potential difference between the input terminal and the output terminal generated when the switch is turned off , the input terminal and the third terminal Switching means provided between and an auxiliary current path having a display means that is turned on when the switching means is turned on , and the potential difference determining means detects a potential difference when the switch is turned off while a load is connected. The switching means is turned on to cause the indicator lamp lighting current to flow to start the display means.

Further, the potential difference determining means is a potential difference detection circuit using a transistor or a field effect transistor.
The switching means is any one of a transistor, a field effect transistor, and an insulated gate bipolar transistor.

The switch with a position indicator lamp of the present invention is a switch with a position indicator lamp that turns on the position indicator lamp when the main circuit contact that opens and closes the load current is turned off, and includes a Darlington transistor having an input resistor and a current limiting resistor. It has a display lamp, Darlington transistors, the load detects a potential difference between the input terminal and the output terminal when the switch is turned off in the connected state, connecting the input terminal to the power supply when a potential difference is generated The indicator lamp lighting current is passed through an auxiliary current path provided between the third terminal and the indicator lamp provided in the auxiliary current path is lit.

The switch with a position indicator lamp of the present invention is provided with a current path different from the current path between the input terminal and the output terminal, and allows the indicator lamp lighting current to flow selectively according to the on / off state of the switch. Thereby, since the indicator lamp lighting current can be prevented from flowing to the load when the switch is turned off, the load (lighting fixture) can be reliably turned off (stopped) while the indicator lamp is turned on when the switch is turned off.
In addition, since the indicator lamp lighting current flows without going through the load of the switch, even if the impedance is high when the lamp is turned off, the lighting brightness of the position indicator lamp does not decrease and a stable display can be obtained.
In addition, since the indicator lamp lighting current can flow without going through the load of the switch, various light sources such as LEDs, miniature bulbs, and cold cathode fluorescent lamps that are too large for the normal indicator lamp are used. This increases the degree of freedom in designing the position indicator lamp.

  Further, since it is not necessary to assign the main contact of the switch exclusively for driving the position indicator lamp, a switch with a position indicator lamp having the same characteristics can be developed for a three-way switch or the like.

  Further, in the switch with a position indicator lamp of the present invention, when the luminaire is not connected (when the bulb is cut off or disconnected), that is, when there is no load, the indicator lamp lighting current does not flow. Can be notified to the user.

It is a block diagram of the illumination lighting circuit using the switch with a position indicator lamp of this invention. It is a figure which shows the specific example of FIG. It is a block diagram of the illumination lighting circuit of the 3 way switch using the switch with a position indicator light of this invention. FIG. 4 is a configuration diagram of an illumination lighting circuit using a conventional switch with a position indicator lamp.

  The present invention realizes flowing an indicator lamp lighting current to a position indicator lamp in accordance with on / off of a switch.

The switch with a position indicating lamp of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an illumination lighting circuit using a switch with a position indicator lamp according to the present invention. In FIG. 1, the same components as those in FIG. 4 are denoted by the same reference numerals as those in FIG.
In the illumination lighting circuit of FIG. 1, the input terminal 0 of the switch with position indicator lamp 14 is connected to a commercial AC power source E, and the output terminal 1 is connected to a load L (incandescent light bulb or LED light bulb).
The switch 14 with position indicator lamp is provided with a third terminal 3 connected to the commercial AC power source E. The third terminal 3 is an auxiliary terminal that outputs the indicator lamp lighting current I. Between the input terminal 0 and the third terminal 3, another current different from the current path 12 between the input terminal 0 and the output terminal 1 (current path through which the current flowing between the contacts 16 and 18 of the switch S1 flows) is provided. A path 20 (hereinafter referred to as “auxiliary current path”) is provided.
Further, the position indicator lamp-equipped switch 14 is provided with a potential difference determining means 24 for detecting a potential difference. The auxiliary current path 20 is provided with a display means 22 as a position indicator lamp and a switching means 26. When the potential difference determination means 24 detects a potential difference between the input terminal 0 and the output terminal 1, the switching means 26 is provided. Is conducted, and the display means 22 is activated.

The potential difference determination means 24 detects a potential difference generated between the contacts 16 and 18 of the switch S1, that is, between the input terminal 0 and the output terminal 1 when the switch S1 is turned off.
In the circuit of FIG. 1, when the switch S1 is turned on, the load L is lit. When the load L is lit, there is no potential difference between the contacts 16 and 18 of the switch S1. On the other hand, when the switch S1 is turned off, a potential difference is generated between the contacts 16 and 18 of the switch S1. The potential difference determination means 24 determines the on / off state of the switch S1.
Further, when there is no load (when no load is connected), there is no potential difference between the contacts 16 and 18 of the switch S1, so that the potential difference determination means 24 is in the ON state regardless of whether the switch S1 is opened or closed. Same operation.

  The switching means 26 selectively controls energization of the auxiliary current path 20 in accordance with the on / off state of the switch S1 determined by the potential difference determination means 24. When the potential difference determining unit 24 determines that the switch S1 is in the ON state, the switching unit 26 is not conducted and the display unit 22 (position indicator lamp) is not activated (lit). On the other hand, when the potential difference determining unit 24 determines that the switch S1 is in the OFF state, the switching unit 26 is turned on and the display unit 22 is activated.

The display means 20 is activated when the switching means 26 becomes conductive. Accordingly, the display means 20 (position indicator lamp) is lit only when the switch S1 is turned off while the load L is connected.
In the present invention, since the indicator lamp lighting current I does not flow to the load L, the display means 22 has a large required lighting current other than the neon tube NL, such as an LED bulb or a miniature bulb that cannot be normally used as a position indicator lamp. Elements can also be used, and there is an effect that the brightness and color of the indicator lamp can be designed freely.

  As described above, the switch with a position indicator lamp according to the present invention selectively causes the indicator lamp lighting current to flow according to the on / off state of the switch, and outputs the indicator lamp lighting current from the third terminal that does not flow to the load. . According to the present invention, since the indicator lamp lighting current can be prevented from flowing to the load when the switch is turned off, the indicator lamp can be turned on when the switch is turned off, and the lighting fixture (load) can be reliably turned off (stopped). .

Further, according to the present invention, since the indicator lamp lighting current flows without going through the load of the switch, the position indicator lamp can be turned on even with a load such as a “glow-lit fluorescent lamp fixture” having a high impedance when extinguished. There is an excellent effect that a stable display can be obtained without lowering the luminance.
Further, according to the present invention, the main circuit contact always opens and closes the load current of the switch without directly opening and closing the weak indicator lamp lighting current at the main circuit contact of the switch. Has an effect that a current sufficient to develop a contact cleaning effect due to the open / close spark is applied, and contact failure due to the oxide film hardly occurs.

  In addition, in the switch with a position indicator lamp of the present invention, when the lighting fixture is not connected (when no load is applied), the position indicator lamp does not light even if the switch is turned off. Can be informed. In addition, since the firefly switch of Patent Document 1 uses a three-way switch, the position indicator lamp is always turned on when the switch is turned off. I don't have it.

FIG. 2 shows a specific example of FIG. Specific examples of the potential difference determination unit and the switching unit will be described with reference to FIG.
FIG. 2 shows a switch 14 with a position indicator lamp having a Darlington transistor having an input resistor R2 connected so that the output of the transistor Tr1 is input to another transistor Tr2, and a neon tube NL having a current limiting resistor R1. It represents. In the position indicator switch 14, the Darlington transistor detects a potential difference between the input terminal 0 and the output terminal 1, and when the potential difference occurs, the indicator lamp lighting current I flows from the input terminal 0 to the auxiliary current path 20, Neon tube NL (indicator) is turned on.
In FIG. 2, a potential difference detection circuit 28 composed of an input resistor R2 and a transistor Tr1 functions as the potential difference determination means 24 in FIG. 1, and the transistor Tr2 functions as the switching means 26 in FIG. That is, the transistor Tr1 detects the potential difference between the base (or output terminal 1) of the transistor Tr1 and the emitter of the transistor Tr2. The transistor Tr1 is turned on when a potential difference is generated between the input terminal 0 and the output terminal 1. When the transistor Tr1 is turned on and the transistor Tr2 is turned on, the indicator lamp lighting current I flows from the input terminal 0 to the auxiliary current path 20, and the neon tube NL is lit. The neon tube NL and the current limiting resistor R1 in FIG. 2 function as the display unit 22 in FIG.

The potential difference determination means 24 may be other detection means (for example, a thyristor, a triode vacuum tube, etc.) other than the potential difference detection circuit 28 composed of a transistor and a resistor. The transistor of the potential difference detection circuit 28 may be a field effect transistor (FET).
As the switching means 26, any one of a field effect transistor (FET) and an insulated gate bipolar transistor (IGBT) may be used in addition to the transistor.
In addition, there are a photocoupler, a reed relay, and the like that have the function of the potential difference determination means 24 or the switching means 26.

FIG. 3 is a configuration diagram of an illumination lighting circuit of a three-way switch using the switch with a position indicator lamp of the present invention. The circuit in FIG. 3 represents a state in which the load L is not lit and the display means (position indicator lamp) is lit.
In the switch 30 with a position indicator lamp of FIG. 3, when the terminals 1 and 3 are connected, the entire circuit is equivalent to the circuit of FIG. Therefore, when the load L is not lit as shown in FIG. 3, a potential difference is generated between the terminals 1 and 3. Therefore, the potential difference determination unit 24 determines that the switches S2 and S3 are in the OFF state, and the switching unit 26 Conduction is performed, and the display means 22 is activated. When either one of the switches S2 or S3 is turned on, the potential difference determining unit 24 determines that the switches S2 and S3 are in the on state, the switching unit 26 is not conducted, and the display unit 22 is not activated.
In FIG. 3, the terminal 4 is a third terminal according to the switch with a position indicator lamp of the present invention, and a current path 20 including a switching means 26 and a display means 22 is provided between the terminals 0 and 4. ing.

  As described above, the switch with a position indicator lamp of the present invention is a switch with a position indicator lamp that does not need to assign the main contact of the switch exclusively for driving the display means, and therefore has the same characteristics as the three-way switch. A switch with a position indicator can be deployed. Similarly, it can be used for a four-way switch, a two-position operation switch, and the like.

DESCRIPTION OF SYMBOLS 0 Input terminal 1 Output terminal 3 3rd terminal 14 Switch with position indicator lamp 20 Auxiliary current path 22 Display means 24 Potential difference judgment means 26 Switching means 28 Potential difference detection circuit 30 Switch with position indicator lamp E Power supply L Load I Indicator lamp lighting current

Claims (4)

With an input terminal connected to the power supply, an output terminal connected to the load, and a third terminal connected to the power supply, with a position indicator that lights the position indicator when the main circuit contact that opens and closes the load current is off A switch, a potential difference determining means for detecting a potential difference between the input terminal and the output terminal generated when the switch is turned off; a switching means and a switching means provided between the input terminal and the third terminal; and an auxiliary current path comprising a display means for lighting by the conduction of the electric potential difference determining means, a potential difference is detected if the switch in a state where load is connected is turned off, indicator by conducting the switching means A switch with a position indicating lamp, wherein a lighting current is supplied to activate the display means. 2. The switch with a position indicator lamp according to claim 1, wherein the potential difference determination means is a potential difference detection circuit using a transistor or a field effect transistor. 3. The switch with a position indicating lamp according to claim 1, wherein the switching means is any one of a transistor, a field effect transistor, and an insulated gate bipolar transistor. A position indicator switch with indicator lamp for lighting the position indicator at the OFF time of the main circuit contacts for opening and closing the load current, have a display lamp comprising a Darlington transistor and a current-limiting resistor having an input resistance, Darlington transistors, load An auxiliary device provided between the input terminal and the third terminal connected to the power source when the potential difference is detected when the switch is turned off while the switch is connected. A switch with a position indicator lamp, wherein an indicator lamp lighting current is passed through a current path, and the indicator lamp provided in the auxiliary current path is lit.

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