JPS6047399A - Device for dimming fluorescent lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a dimming device for a fluorescent lamp, and more particularly to a device that performs stepwise dimming.

[Background of the invention]

8IT1 Diagram (1) Showing an example of a conventional stage dimmer dimmer for fluorescent lamps
ward, so firefly via power source 1 Sochi 8 to AC power source 1) Y
, the lamp ballast 2 is connected. Generally fluorescent /
It is known that a rapid start type lighting device in which the filament has been preheated is preferable for dimming the lamp, considering other conditions such as maintaining the discharge. ] Figure 9 shows ■ Fluorescent lamp ballast 2 is an AC type: 'fIA1
A preheating current is supplied to the connected stones, the primary winding 21, the secondary winding 22 forming the discharge impedance, the phase advance condenser 23, the filament of the fluorescent wrap 3, (1, 31)
This is a leakage transformer type ballast equipped with 2R6 preheating windings 24.24, and both preheating windings 24.24 also serve as output terminals of the ballast 2 for fluorescent lamps. Between the fluorescent lamp ballast 2 and the fluorescent lamp 3, a normally closed short-circuit switch 41 and a stone are connected in parallel.
(The choke coil 43 that constitutes the dimming impedance
, - connect capacitor 42 1. The alternating current power source 1 is applied and operated by opening/closing an operating switch 60, and opening/closing is controlled by a control unit 11 equipped with a recoil coil 51.

The problem with such a light control device is that the power source for driving the flill-mounted relay coil is an AC power source. In other words, for this type of lighting, one circuit usually has a voltage of 1 (10 V, 2 n o V/%).
1. In order to simply open and close the contacts, a rated voltage relay must be used. When the voltage is high, even if the current is kept low, the operating loss will be several watts.
As a d-;Q device, there is a problem that the loss is large. Of course, if a down transformer is used, the relay voltage will be lower and the loss will be reduced, but the loss will be 1-tance, so the profit will not be affected.

It is also possible to take the output from the primary winding of the ballast, but the ballast itself would be expensive, and the ballast itself would be expensive, and the ballast itself would be expensive. This is not available.

[Object 1] of the invention] A. The object of the invention is to obtain a light control device that can be easily attached to existing appliances and that is equipped with a control circuit that causes less power-to-power loss. .

[Summary of the invention] The invention is to insert a short-circuit switch between a fluorescent lamp ballast and a fluorescent wrap, and connect a dimming Innovidance in parallel with this short-circuit switch. A control 1141 circuit including a switch 1/- for controlling the opening and closing of the circuit is connected in parallel with the filament of the all-fluorescent lamp.

I'm trying to drive a control circuit using the preheating voltage of 6C, which is 6C.

[Labor, light O] Implementation sequence] Figure 2 shows the first embodiment of the present invention, and the cross 3ii
: Fluorescent lamp ballast 2 via electric hxuc power switch 8
The problem continues, and the output terminal of the fluorescent lamp ballast 2 (-
The location where the wrap 3 is connected to RL is the same as in FIG. 4 υ). A dimming unit 4 is inserted between the fluorescent lamp ballast 2 and the fluorescent lamp 3, as shown in FIG.
This light control unit 4 is equipped with a short circuit switch 41 and a light control in-beam/bus in parallel. 7 is a control unit that controls opening and closing of the short circuit switch 41, and this power supply is connected to one preheating winding 24 of the ballast 2 for the firefly J1'J lamp.
I'm getting it from This control unit 7 converts the output of the preheating winding 24 into a direct current with a full-wave rectifier 78, and connects it to a smoothing coil 117fi via a diode 77. Both ends of this smoothing capacitor 76 are connected to a short-circuit switch/117i: a relay coil 71 that opens and closes. Relay coil 71 c'ji: connected to column transistors 72/],
I'm here. By opening and closing this transistor 72, current is supplied to the relay coil 7 and 11, and the short circuit switch 41Tc
Opening/closing 1-ru. The opening and closing of this transistor 72 is performed by a fringe flow circuit 73 that provides a base voltage.
．． Ru. This flip-flop circuit 73 is connected to the illumination controller 76, and its control circuit 11
The signal is obtained directly from the full wave rectifier 78. That is,
A diode 752 and a diode Jl are connected to the theta input terminal and the clock input terminal C of the flip-flop circuit 73, respectively.
(Resistor 751: (- Charged through tq, z:, terminal voltage of capacitor 75, quiode 742 ° C charged through resistor 741, terminal voltage of capacitor 74 input I
I. ``No, the terminal voltage of clock terminal C is TI.
(I-1i g b level), the data terminal DθJ state is output to the output terminal O, so if the theta 1 child 1 is I and γ1, the output terminal O will also be , the switch Zl) 72 conducts, passes a drive current to the relay coil 71, and opens the shorting switch 41.If the normally open type is used for the shorting switch 41, the switch 72 is closed. −
Of course, this is a big deal.

A detailed explanation of the operation of the fluorescent lamp dimmer device having such a configuration 6. ．． ．． When the power switch 8 is closed, the fluorescent lamp 3 is turned on, and at this time the control unit 7 performs the following operations. That is, capacitor 74.75
If a voltage is applied to the uncharged state, both fins
74 and 75 are charged by connecting resistors 741 and 751,
However, the time constant at this time is determined by the capacitor 74 and the resistor 7.
41 combinations - (1 is the combination of capacitor 75 and resistor 751
If the terminal chamber It- of the capacitor 74 is selected to be smaller than the combination of the capacitors 74 and 75, the terminal chamber It- of the capacitor 74 will reach the H state earlier than the capacitor 75's terminal chamber It-. Therefore, when the clock terminal C becomes H, the data terminal is in the state of I)CTJow level), so the output terminal 0 becomes L, and the transistor 72 maintains an open state. That is, the short-circuit switch 11 remains closed, and the fluorescent lamp 3 maintains the full light state. Next, when the power switch 8 is opened in this state, the charge in the capacitor 74 is quickly discharged through the discharge resistor 743. However, the charge of -1 + j-75 (''
Since it does not discharge easily, it maintains the H state during the delay. Of course, a discharge resistor is provided to form a difference between the discharge time constant 74 and the resistor 743.
1 In this way, when the power switch 8 is turned on with sufficient charge remaining in the capacitor 75, when the terminal voltage of the capacitor 74 reaches Fl, the data terminal is already Therefore, the output terminal O is also ■
■It becomes. As a result, the transistor 72 becomes conductive, and the drive current is applied to the relay coil 71, and the short-circuit switch 41 is opened, and the dimming impedance f and f are automatically inserted from the child yoke coil 43 and the capacitor 42. ,
The flashing 1'1 lamp 3 is dimmed.

C), H:=t, control unit/door J, 21, 1
The opening and closing of the transistor 2 can be controlled by the state of the data terminal of the one-tube flop circuit 73, and as a result, the opening and closing of the short circuit switch 4 can be controlled. Also, this i
The opening and closing of the short-circuit switch 41 by the control needle can be remotely controlled by opening and closing the power switch 8.7:' It is convenient to add a dimming function to an existing fluorescent lamp fixture.

Further, the fluorescent lamp ballast 2 uses a leakage transformer type circuit, and a secondary winding is formed for the primary winding 21. This secondary winding constitutes a discharge impedance for stably lighting the fluorescent lamp 3, and in the illustrated circuit it is connected directly to the power supply line, but if the inductance is insufficient as a discharge impedance, the primary winding In some cases, it is connected to the middle tap. In this way, in the 7 and f circuit 9, there is a difference in the voltage applied to the preheat winding &124 during normal preheating and during lighting. 1' change. That is, when the power switch 8 is closed and the power switch 8 is closed, the current (O) is slightly changed to A7. Since the change in temperature is delayed, the preheating voltage is also used as the preheating voltage. ．I stand up with a plan. Between time T1 and T2, fiilJ(f
When the fluorescent lamp 3 is turned on at time T3, the preheating voltage is lowered. This decrease in voltage and voltage is due to the generation of magnetic flux caused by the current flowing through the secondary winding 22, which cancels out the magnetic flux caused by the primary winding 21. This type of circuit Most 7'V capacitors are designed to have such characteristics. When the fluorescent lamp 3 is lit, the lamp current becomes the raw material, but the preheating current is directly ＼l and the liquid is extracted. 5, filament 31
Since the temperature of the fluorescent lamp 31 becomes higher than necessary and shortens its life, it is better to suppress the preheating current after lighting (for the fluorescent lamp 31).In this way, the fluorescent wrap point punching In the case of the fluorescent lamp ballast 2I where the preheating voltage decreases, the current flowing through the relay coil 71 also decreases, but the current flowing through the general relay coil 70 is compared to the driving current l. Therefore, the holding current can be reduced by one minute θ] without any problem.The control i′ is reduced by decreasing the reverse voltage.
(IL gain is very large.Experiment tkoyo rl, if 40
In the W Rabbit 1st type ballast, the preheating voltage drops from 3.8V during preheating to 32~F during lighting, so the loss is reduced by approximately 30V.

FIG. 3 shows an embodiment of the present invention @2, in which the light control unit 4. J-I is the same as FIG. 2 except for the configuration of the control unit 7. This light control unit 4 is a normally open type v
'4y connection switch 46 and capacitor 42, child yoke: I
Dimming impedance consisting of 43 coils are connected in parallel.
A second capacitor 44 is connected in parallel with the capacitor 42 via a normally open second shorting switch TI54. The first and second transistors 92 and 94 are controlled by the first and second transistors 9.
Depending on the opening and closing of No. 2 and 94, the control unit 7I is controlled. The control unit 7 is constituted by a circuit as shown in FIG. 4, for example.

When the power switch 8 is turned on, the capacitors 74 and 75 of the control circuit 7 are charged, but the charging time constant of the resistor 74 and the capacitor 74 is set to be smaller than the charging time constant of the resistor 751 (!: capacitor 75). Therefore, the first
The clock terminal C1 of the flip-flop circuit 73 is Hl.
In this case, the output terminal 01 becomes L and the first transistor 92 does not conduct. Second flip-flop circuit 7°9
Since the data terminal D2 of the first . The second shorting switch 46, 45 remains open. The fluorescent lamp 3 consists of a choke coil 43° and a capacitor lI2.
Lit through Soth. Next, open the power switch 8 and turn it on again, and the charge C-1 of the capacitor 75 will be released.
Therefore, the data terminal D1 is H, and when the output terminal 01 becomes 1, the output terminal 01 becomes 11, and the second transistor 92 becomes conductive.
The relay coil 9 is energized, the shorting switch 45 is closed, and the second coil 44 is inserted and adjusted.
, f novitance becomes smaller and fluorescent lamp 3C4
It gets brighter. At this time,? - The clock terminal C2 becomes H♂ before the output terminal D2 becomes l+i. Then, if the power switch 8 is opened 211 and 19 is turned on again, the data terminal D2 of the second 7-return valve 11 circuit 79 is connected to H and 4f, so the clock is The output terminal 02 is 11 and the terminal C2 is 11,
The second transistor 94 conducts to energize the second relay coil 93 and close the second short switch 71 4G. As a result, the fluorescent lamp 3 is lit with 4-light. On the other hand, the reset terminal R of the second 711 block flop circuit 79
Since 2 becomes )], the 10th) flip-flop circuit 73
is reset and the nx output terminal 01 returns to LI. The feature of this circuit is that it is capable of dimming and repeating full lighting.

In addition, since the light is turned on in a dimmed state immediately after the power switch 8 is turned on, it is easy to use when the light is turned on for the purpose of saving power.

[Effect of the invention] As explained above, there are four inventions. 1-γ1 is the control unit that controls the dimming unit.7 QYJ', since the source is obtained from the preheating winding of the leaky transformer type fluorescent lamp ballast, the operating voltage is low. Since the total loss can be reduced due to the inability to use Iil "Jf", the dimming circuit for the purpose of power saving can be used. (Because of that, Kayakotoso/)−
If the connection lead wires are connected to the mower, the dimmer unit L control unit can be installed at the same time, making it easy to remove the existing fluorescent lamp fixtures.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a conventional dimming circuit FA, Fig. 2 is a circuit diagram showing an embodiment of the present invention, Fig. 3 is a naval circuit diagram showing another embodiment, and 1st Ward 11F Crime Control 1. A circuit diagram showing an embodiment of U'No. 1, Fig. 5 is a water characteristic diagram showing the terminal voltage of the preheating winding, and T1 shown in Fig. 1 is an AC B. g, 2 is a ballast for fluorescent lamps,
3 is a fluorescent lamp, 4 is a light control unit, 7C is a power source, and 8 is a power source F. , Figure 1 Capital 2 Figure 3 Figure 4 Figure 5 巳tbtr h 73 →

Claims (1)

[Claims] (1) For leakage transformer type fluorescent lamps, which include a preheating winding and are configured such that the preheating voltage applied to the filament of the fluorescent lamp decreases after the fluorescent lamp is turned on. In a fluorescent lamp lighting device comprising a fluorescent lamp connected to a ballast, a short circuit switch is inserted between the fluorescent lamp ballast and the fluorescent lamp, and a dimming input 1-2 is provided in parallel with the short circuit switch, A fluorescent lamp dimmer comprising: a control circuit for controlling opening/closing of at least the short-circuit switch; and the control circuit is connected in parallel with the filament. It consists of a flip-flop circuit having an input terminal, a long clock terminal, and a data terminal, and a switching element whose opening and closing are controlled by the output 1 of the flip-flop circuit, and a signal state Nil held by the data terminal when a power supply voltage is applied. Accordingly, the switching element is controlled to open and close, and the short circuit switch is opened and closed by the switching element t.
Fluorescent lamp dimmer device as described in section.