JPS5856477B2 - Dimmer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to a dimming device for indoor ceiling lighting using a phase control semiconductor including a bidirectional three-terminal thyristor (hereinafter referred to as TRIAC).

Conventional dimmer devices have separate power switches and dimmer switches or dimmer volume; I was trying to set it with .

However, such a light control device requires a light control switch or a volume control in addition to a power switch, resulting in poor operability and complicated wiring.

This invention solves the above-mentioned drawbacks, makes wiring simple, and has great operability as the light source blinks and the lighting state can be set to a preset dimming depth by repeatedly turning the power switch on and off. The purpose is to provide an excellent light control device.

Next, the present invention will be described in detail with reference to drawings showing one embodiment thereof.

In the figure, 1 and 2 are both power supply terminals of a commercial AC power supply, 3 is a power switch installed on the wall of the room, 4 is an incandescent light bulb as a load, A and B are input devices of the dimmer, 5
6 is a triac which is a bidirectional thyristor connected between the input terminals A and B, and 7 and 8 are the input terminals A.

A current limiting resistor connected in series between B and a Zener diode connected in anti-series; 9 and 10 are current limiting resistor 7;
A trigger capacitor and a variable resistor for dimming adjustment are connected in series between the connection point of the button and the anti-series connected Zener diode 8 and the input terminal B, and 11 has one end connected to the trigger capacitor 9.
and the SBS connected to the connection point of the dimming adjustment variable resistor 10.
, a diac, a voltage trigger element such as a trigger SSS, and the other end is connected to the gate of the triac 6.
Current limiting resistor 7, Zener diode 8, trigger capacitor 9, dimming adjustment variable resistor 10, trigger element 11J
8 and triac 6, the dimming phase control circuit PC
is configured.

12 is a rectifier such as a diode bridge whose input terminals are connected to both ends of the dimming adjustment variable resistor 10;

b is an output terminal of the rectifier 12; 13 is a smoothing capacitor connected between both output terminals a and b of the rectifier 12;
4 is a discharge resistor connected between both output terminals a and b of the rectifier 12, and 15 is an N-gate thyristor such as PUT whose cathode is connected to the output terminal of the rectifier 12.
16 is a gate resistor whose one end is connected to the output terminal a of the rectifier 12, and the other end is connected to the gate of the N-gate thyristor 15; 17, 18, and 19 are the output terminals a of the rectifier 120;

a first charging diode, a charging capacitor, and a second charging diode connected in series between the first and second charging diodes;
2. The anode of the N-gate thyristor 15 is connected to the connection point between the charging diode 17 and the charging capacitor 18.
0 is a holding current resistor connected to both ends of the second charging diode 19, which is connected to the rectifier 12 and the smoothing capacitor 1.
3, the N-gate thyristor 15, the first charging diode 17, the charging capacitor 18, the second charging diode 19, etc. constitute a switch circuit SC.

In addition, diodes 17, 19, charging capacitor 18,
The N-gate thyristor 15, the button and the resistor 1620 constitute a charge/discharge circuit, the dimming adjustment variable resistor 10 and the trigger capacitor 9 constitute a CR time constant circuit, and the C
The R time constant circuit and the trigger element 11 constitute a phase control circuit.

Next, the operation of the above embodiment will be explained.

1. To explain the operation assuming that the switch circuit SC is not provided in the figure, when commercial AC power is applied between both power supply terminals 1 and 2 and the power switch 3 is turned on, the Zener diode 80 is connected across the terminals. The trigger capacitor 9 is charged based on the time constant of the trigger capacitor 9 and the dimming adjustment variable resistor 10 at a voltage of When the voltage at the connection point with the adjustment variable resistor 10 rises and reaches the breakover voltage of the trigger element 11, the trigger element 11 is turned on and the trigger element 11 is turned on by the charge in the trigger capacitor 9. A gate voltage is applied to the triac 6 through the triac 6, the triac 6 is turned on, and the AC power is passed through the triac 6 to turn on the incandescent light bulb 4, which is the load, and the incandescent light bulb 4 is turned on according to the change in the adjustment of the variable resistor 10 for dimming adjustment. This allows you to freely change the brightness of the light bulb.

By the way, if the variable resistor 10 for dimming adjustment is adjusted to make the incandescent light bulb 4 of the load a little darker, and the switch circuit SC is provided, the dimming phase will change when the power is turned on in the operation described above. The control circuit PC performs phase control based on the time constants of the trigger capacitor 9 and the variable resistor 10 for dimming adjustment, so that the incandescent light bulb 4 lights up slightly dimly, and at the same time both ends of the variable resistor 10 for dimming adjustment are controlled. DC voltage due to voltage rectifier 1
The charging capacitor 18 is charged via the two charging diodes 17 and 19.

Therefore, when the power switch 3 is turned off, the charged charge in the smoothing capacitor 13 is discharged via the discharging resistor 14, and the charged charge in the charging capacitor 18 is passed through the anode of the N-gate thyristor 15 to the gate. , gate resistor 16, discharge resistor 14 button, and gate current resistor 20
Since the discharging current of the charging capacitor 18 causes a gate current to flow through the N-gate thyristor 15, the N-gate thyristor 15 is turned on instantly. The subsequent charging charge of the charging diode 17
, is discharged through the N-gate thyristor 15.

Further, a discharge current due to the charge in the charging capacitor 18 is discharged via the N-gate thyristor 15 and the holding current resistor 20.

When the power switch 3 is turned on while the N-gate thyristor 15 is kept on due to the discharging current of the charging capacitor 18, the charging current to the trigger capacitor 9 is discharged through the dimming adjustment variable resistor 10. As it flows, it is simultaneously charged via the rectifier 12, first charging diode 17, and N-gate thyristor 15.

That is, when the power switch 3 is turned on while the N-gate thyristor 15 is in the on state, the charging current to the trigger capacitor 9 is divided into a current flowing through the dimming adjustment variable resistor 10 and a current flowing through the N-gate thyristor 15. The time constant of the CR time constant circuit changes substantially to become the sum of
There is almost no phase delay when the trigger element 11 breaks over, and the triac 6 turns on at approximately 100% conduction angle.

Therefore, at this time, the incandescent light bulb is approximately 100% lit.

On the other hand, the charge in the charging capacitor 18 is completely discharged when the incandescent light bulb 4 is 100% lit, and is not newly charged when the N-gate thyristor 15 is on, so when the power switch is turned on next When 3 is turned off, it immediately returns to the initial state.

Therefore, when the power switch 3 is turned on again, the charging current to the trigger capacitor 9 becomes only the current flowing through the dimming adjustment variable resistor 10, and as a result, the incandescent light bulb 4 is charged to the dimming adjusting variable resistor 10. The lighting state is determined by the dimming depth determined by .

In this way, when the power switch 3 is turned on from the initial state, the incandescent light bulb 4 enters the lighting state with the dimming depth set in the dimming adjustment variable resistor 10, and from that state, the power switch 3 is turned off once and then turned on again. Then, incandescent light bulb 4 is 100
In this state, if the power switch 3 is turned off and then turned on again, the incandescent light bulb 4 returns to its original dimmed lighting state.

It goes without saying that if the power switch 3 is turned off, the incandescent light bulb 4 remains off.

As described above, according to the present invention, turning on the power switch,
One light source can be blinked and dimmed by repeatedly turning it off, making it extremely easy to operate.Furthermore, by installing a power switch on the wall, only two lines are required for wiring. This has the advantage that installation work is extremely easy.

All electronic components used are semiconductor elements and CR
Since it is composed of electronic components, the dimming device can be made small and highly reliable.

[Brief explanation of the drawing]

The figure is a wiring diagram of one embodiment of the light control device of the present invention. 1.2...Power terminal, 3...Power switch, 4...
・Incandescent light bulb, 6... Bidirectional 3-terminal thyristor, 8.
...Zena diode, 9...Trigger capacitor,
10... Variable resistor for dimming adjustment, 11... Trigger element, 12... Rectifier, 13... Smoothing capacitor, 1
5...N gate thyristor, 18...Charging capacitor, PC...Phase control circuit for dimming, SC...Switch circuit.

Claims (1)

[Claims] 1. A bidirectional thyristor connected in series to a light source, a capacitor charged by a commercial power source, and a capacitor connected in parallel to the capacitor, which is connected in parallel to the capacitor, and when the power switch is turned off, the charge on the capacitor is a charging/discharging circuit including a switching element that conducts when
and the charging/discharging circuit is connected to a CR time constant circuit of the phase control circuit so that the time constant of the phase control circuit changes depending on whether a switching element of the charging/discharging circuit is conductive or not. A light control device, wherein the phase control circuit includes a CR time constant circuit, and a voltage trigger element connected between the OCR connection point of the CR time constant circuit and the gate of the bidirectional thyristor. .