JPH0645075A - Dimming device - Google Patents

Abstract

PURPOSE:To suppress the noise generation and the waveform distortion to a power source, reduce the number of part items, and improve reliability by switching the series, single and parallel lighting of two or more incandescent bulbs in multistage by switches. CONSTITUTION:A circuit is formed of incandescent bulbs 1 and switches 2, 3, 4. In this circuit, two incandescent bulbs 1 are lighted in series by the input of only the switch 2. Similarly, only one incandescent bulb 1 is lighted by the input of only the switch 3. Further, two incandescent bulbs 1 are lighted in parallel by the input of only the switch 4. By selectively inputting the switches 2, 3, 4, thus, dimming of three stages can be performed. The number of part items to be used is minimized, reliability can be improved at low cost, and since switching by pulse is not adapted, noise generation can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention simplifies the circuit structure,
The present invention relates to a noiseless light control device with improved reliability and easy handling.

[0002]

2. Description of the Related Art A typical conventional light control device is a switching system. This is a method for conducting an alternating current appropriately by phase control by a thyristor, a triac or the like by a thyristor, a triac, etc., and dimming by continuously varying from zero to a full wave, which is often used.

These are thyristors, which are the main switches,
In addition to triacs, there is a pulse generator circuit for controlling the phase and a circuit for adjusting the phase.In practical use, noise is generated by generating pulses, and electronic parts such as noise countermeasures for suppressing these are provided. I use it a lot.
Therefore, not only the cost is increased, but also the reliability of the device is lowered.

In practical use, the dimming amount is usually set to 2
Often used at fixed points of ~ 3, the need for continuous variable is scarce, and there is also part of excessive functional design.

On the other hand, when viewed from the power supply side, it is a system in which only a part of the AC power supply is arbitrarily used. Therefore, if these are used abundantly, it may cause distortion of the AC power supply waveform. It poses new challenges such as obstacles to

[0006]

The problems to be solved are noise generation due to heavy use of switching methods and countermeasures against it, as well as cost increase and reliability increase due to the use of many electronic parts for variable operation. It is one of the sources of the drop and waveform distortion to the power supply side.

[0007]

[Means for Solving the Problems] The current supply of a light bulb or the like is controlled by a series parallel connection of a light bulb or the like and a rectifier, half-wave rectification, full-wave rectification, and series connection of capacitors, and a method that does not frequently use switching of a power source. Controls noise generation and waveform distortion to the power supply. As a result, we have reduced the number of electronic parts used and reduced reliability.

[0008]

1 is a circuit diagram of an embodiment of a light control device of the present invention, in which 1 is an incandescent light bulb and the like, 2, 3 and 4 are switches. When only the switch 1 is turned on, two incandescent light bulbs are lit in series, similarly when only 3 is turned on, one is lit, and when only 4 is turned on, parallel lighting is performed, and three-step dimming can be performed.

FIG. 2 is a circuit diagram of another embodiment of the dimming device of the present invention, in which 6 is a rectifier and the others are the same as those in FIG. When only the switch 1 is turned on, the incandescent light bulb becomes half-wave lighting,
Furthermore, when 3 are turned on at the same time, full-wave lighting is possible and 2-step dimming is possible.

FIG. 3 is a circuit diagram of another embodiment of the light control device of the present invention, in which 5 is a capacitor and 7 is a coil.
Others are the same as FIGS. Similarly, when only switch 2 is turned on, half-wave DC lighting is performed, and when only 3 is turned on, full-wave DC lighting is performed, and two-step dimming can be performed.

FIG. 4 is a circuit diagram of another embodiment of the light control device of the present invention. The respective parts are the same as those in FIGS. It becomes dark when only the switch 3 is turned on, and becomes an intermediate brightness when the switch 4 is additionally turned on, and becomes bright when the switch 2 is turned on, and three-step dimming is possible.

FIG. 5 is a circuit diagram of a conventional continuously variable light control device. 8 is a resistor, 9 is a semi-fixed resistor, 10 is a variable resistor, 11 is a diac, and 12 is a triac. The other parts are the same as in FIGS. The description of the operation is publicly known and therefore omitted.

[00013]

As described above, the light control device of the present invention uses a small number of parts and is inexpensive and excellent in reliability. Since there is no switching due to the pulse, there is an advantage that noise generation is small. Also, the dimming setting can be fixed by the manufacturer, which is suitable for artistic lighting or the like. Another feature is that it is generally simple.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a series-parallel connection dimmer such as an incandescent light bulb.

FIG. 2 is a circuit diagram showing a half-wave lighting and full-wave lighting dimming device using a rectifier.

FIG. 3 is a circuit diagram showing a half-wave direct current, a full-wave direct current, and a lighting dimming device using a rectifier and a capacitor.

FIG. 4 is a circuit diagram showing a light control device in which capacitor droppers are connected in series.

FIG. 5 is a circuit diagram showing a variable dimming device using a conventional switching element.

[Explanation of symbols]

 1 Lighting bulbs such as incandescent bulbs 2, 3, 4 Switch 5 Condenser 6 Rectifier 7 Coil 8 Resistor 9 Semi-fixed resistor 10 Variable resistor 11 Diac 12 Triac

Claims (4)

[Claims] 1. A series connection of two or more incandescent light bulbs and the like,
A dimming device that switches between single connection lighting and parallel connection lighting using a switch. 2. An AC lighting fixture including claim 1, wherein an incandescent lamp or the like is connected in series to a parallel circuit of a rectifier and a switch, and half-wave rectification lighting and full-wave rectification lighting are performed by opening and closing the switch. Multi-stage switching dimming device. 3. In a lighting fixture that includes AC lighting including claims 1 and 2, a smoothing capacitor is placed in an AC half-wave or full-wave rectification circuit, and the magnitude of its capacitance is multistaged by a switch. Light control device to switch to. 4. A lighting fixture that includes AC lighting including claim 1, 2, and 3, wherein a plurality of capacitors are connected in series to an incandescent light bulb or the like, and the capacitance of the capacitors is switched in multiple stages by a switch. Light control device.