JPS5853199A - Dimmer - 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 The present invention relates to a dimming device that is used in a lighting device for lighting a discharge lamp using a stable fs having a capacitor and an inductance connected in series, and sometimes makes the lighting device continuously illuminate.

Generally, when a discharge lamp tI11 is emitted, a ballast (hereinafter referred to as C
Many methods have been adopted in which the frequency of the power supply applied to these is varied using a power supply (referred to as a -L ballast). This C-L
As a ballast, a high-power wheel type ballast having a resonance point at a position slightly shifted from the rated frequency of the discharge lamp is used.In particular, a ballast with a retarded phase power factor, where this resonance point is lower than the rated IIIL number, is used. Those whose resonance point is higher than the rated circumference R number are called phase-advanced power factor ballasts.

By the way, when a phase-advanced power factor ballast is used, due to the frequency characteristics of impedance, the load flow increases near the resonance frequency, so in practice, the tuning in the region excluding the resonance frequency is Light must do it.

Figure 1 is a circle diagram showing the relationship between the power source same wave number f and the relative luminous flux RF of a discharge lamp with a resonance frequency f0 of approximately 75 Hz, a nonary phase, and a high-power wheel type ballast. J
Assuming a luminous flux of 50 Hz, t-100, in the frequency range lower than the resonant wave number f0, the limit is dimming up to ω~70. The wave number ft between the power supplies is varied in a frequency range higher than the resonance frequency 10.

In other words, if a phase-advanced, high-power wheel-type ballast is used, it is not possible to continuously dim the light from a high level to a low level, and furthermore, even if dimming is done while avoiding this resonant frequency region, the entertainment If the power supply frequency enters the resonant frequency region due to operation or wave number fluctuation, an excessive current will flow, causing various problems.

The present invention has been made to eliminate the above-mentioned drawbacks,
The resonant frequency region of the high-power wheel-shaped ballast can be changed continuously from high level to low level by varying the same wave number in either the high or low region. The purpose is to provide a light control device that

In order to achieve the above object, the dimmer of the present invention includes a voltage control circuit that controls the power supply voltage of a lighting device including a discharge lamp and a ballast, and a same wave number control circuit that controls the power frequency of the lighting device. The present invention is configured to include an operating means for operating the voltage control circuit and the frequency control circuit in conjunction with each other.

Hereinafter, one embodiment of the present invention will be described with reference to the attached drawings rJt.

FIG. 2 is a circuit diagram showing the configuration of a light control device according to the present invention.
In the figure, 1 is a commercial power supply, 2 is a ballast consisting of a capacitor and an inductance connected in series, 3 is a discharge lamp, 1O is a rectifier circuit 11, a smoothing circuit 12, and capacitors 13 and 14. converter, plus transistor 4
, a flywheel diode field, a smoothing choke coil ρ, and a capacitor ut-chip circuit, (
Figure 4) shows an inverter having 4111 transistors 31 to 34jP and four diodes A to 381, and a low-pass filter consisting of a coil 41 and a pundenna minor, respectively.

9, (capital) is a control circuit for universally controlling the input circuit and the inverter 30, and the control circuit 51 constituting the control circuit 5o.
52 is a DC power supply, 52 is a variable resistor, 0 is a pulse width modulator that generates a rectangular wave signal with a pulse width approximately proportional to the input voltage, and 52 is a pulse width modulator that generates a pulse signal whose frequency changes approximately in inverse proportion to the input voltage. Then, oscillation occurs below the specified voltage in 4.
*Program elements are included so that the number is fixed at the upper limit, and the group shows a slip-flop circuit, and the number shows an amplifier t.

The operation of the light control device constructed as described above and according to the present invention is as follows:
This will be explained below with reference to Figure 7s3.

First, when the variable resistor section of the control circuit I is operated, a voltage that changes depending on the position of the resistor is applied to the pulse width modulator 53 and the pulse width modulator 4. The pulse width variable circuit applies a square wave signal whose pulse width is approximately proportional to this input voltage to the base of transistor B, and the oscillator 8 applies a pulse signal whose frequency is approximately inversely proportional to the input range pressure to the seven lip-flop circuits. Add.

Flip 70 times lli! group is output terminal Q and Q
Each K generates a rectangular wave signal with an inverted phase, and the output terminal Q
The square wave signal % is applied to the base of the transistor 31 and that through the amplifier %, and the output terminal this square wave signal is amplified 4 % respectively. ll56f: added to the transistor (and its base) through.

On the other hand, the converter IO converts the AC voltage of the commercial power supply 1 into DC 1
It is converted into pressure and applied to the air filter circuit 20.

In the T1 tube circuit 20, since the square wave signal of the pulse width modulator group is applied to the base of the transistor 210,
Outputs a DC voltage approximately proportional to the sliding terminal voltage of the four variable resistors.

Next, the inverter I is connected to the transistor 3 that constitutes the inverter I.
1 and 1, to the base of each of which is applied the signal of the output terminal Q of the clip-70 circuit group, and to the base of each of the transistor proverbs and that, the signal of the output terminal of the flip-flop circuit group is applied, these are rounded. When the transistors 31 and 2 are turned on, a positive voltage ts is generated, and when the transistors & and ( 1II
The laE number is almost inversely proportional to generate a friendly AC voltage. Here, the low-pass filter is included in the output of the inverter, removes harmonic components, and supplies only the fundamental wave component to the discharge lamp 3.

Thus, when the variable resistor section is operated to increase its sliding terminal voltage, the voltage applied to the series circuit of ballast 2 and discharge lamp 3 increases - its frequency decreases.

By the way, in the series circuit of the ballast 2 and the discharge lamp 3, when only the frequency was changed while maintaining the rated voltage, the relative luminous flux changed as shown in Figure 1.
Although the relative luminous flux RF is low in a frequency range higher than that, continuous dimming is possible to an extremely low level. This means that the resonance frequency f0 is higher than the resonance frequency f0.
If the power supply voltage is increased so that the relative luminous flux is 100 for 8, and the pressure in the lIc source area is gradually lowered to the rated voltage in the range below this frequency f2, then the relative luminous flux R
Continuous dimming from Ft100 to the required lower limit becomes possible.

Therefore, in the nine-light device shown in Fig. 2, the oscillator U generates a pulse signal with a frequency four times the frequency f2 shown in Fig. 1 in response to the maximum voltage generated at the sliding terminals of the six variable resistors. The output frequency of the inverter (equipment) is set to 1 kf, and the pulse width modulation group 6 has a relative luminous flux of 10 kf for the same wave number f2.
The voltage to be applied to the chopper circuit is determined so that it becomes well over 0.

On the other hand, in response to the minimum voltage generated across the sliding resistor 52, the oscillator 8 outputs a pulse signal with a frequency four times the same wave number f3 shown in FIG. The frequency is set to t3, and the pulse width modulator 53 generates approximately the commercial power supply voltage for this frequency f.

Thus, by simply adjusting the sliding resistor 52f, the relative luminous flux RF (from -100 to the required lower limit value can be continuously 1/
ClI4 can be used.

Figure 3 (a) is a comparison of the light control a8t between the uninvented daylight device and the conventional daylight device, and the continuous light control range of the conventional light control device was extremely narrow, like a curved line. but,
The continuous light range of the dawn device according to the present invention can be continuously dimmed in all 1111 areas that require dimming, as shown in track 11B.

□ In the above example, the power supply voltage was changed at the same time as the power supply frequency f was changed from f8 to f3, but by changing only the number of ttlIlfIL maintained at the full rated power supply voltage value, dimming at a low level could be achieved. In the area where the frequency cannot be varied, if high level adjustment is performed by adjusting the power supply voltage in a range higher than the rated voltage with 11 held at the power supply frequency ft-fg, the above-mentioned method will be applied. Similarly, it is possible to perform continuous KA light over the entire range required for dimming t.

In this case, for example, a constant voltage diode may be inserted into the input circuits of the pulse width variable group and the oscillator so that the output frequency does not change even if there is a change in the input voltage. Alternatively, these meetings may be made into an a-gram.

733 (b) shows that the power supply voltage is held constant and the number of tlL between the power supplies is changed in a good condition, and the inverse K (source frequency is held constant and the 1 FIG. 9 is a nine-line diagram showing the relationship between the relative luminous flux RIF, which performs continuous dimming over the entire range required by dimming t, and frequency and voltage.

By the way, in the above embodiment, the voltage of the variable resistor section was added to the pulse width variable -11153 and the oscillation@54, and the voltage S and the power supply frequency were changed by operating the variable resistor 652. a voltage control circuit that controls voltage;
The above-mentioned effect may be achieved by adding appropriate means for interlocking operation with the frequency control circuit that controls the power supply frequency.

Further, in the chopper circuit application in the above embodiment, the energization time of the transistor 21 is controlled by a pulse-modulated signal, but other than this, for example, a direct current called a dropper can be used.
t voltage conversion - may occur, or converter l
It goes without saying that the control Igl may be constructed of, for example, a thyristor and generate a signal for phase control using nine AC/DC conversion*.

As is clear from the above explanation, according to the OR optical device of the present invention, even when a high-power wheel type ballast is used, the continuous range from high level to low level can be achieved in one of the high and low regions excluding the resonant frequency region. Dimming becomes possible, and furthermore, by dimming only in one of the regions other than the resonant frequency region, it is possible to prevent the power supply frequency from entering the resonant wavenumber region.

[Brief explanation of the drawing]

Figure 1 is a nine-line diagram showing the relationship between the power supply frequency and the relative luminous flux of a discharge lamp having a phase-advanced, high-power wheel-type ballast, and Figure 2 shows the configuration of an embodiment of the dimmer according to the present invention. The circuit diagrams shown in FIGS. 3(a) and 3(a) show the relationship between the power supply frequency and power supply voltage and the relative luminous flux of a discharge lamp to which the same embodiment is applied, and are plotted in a nine-line diagram. 1... Commercial power supply, 2... Ballast, 3... Discharge lamp,
lO...converter, power...inverter, off...low-pass filter, group...control circuit, variable resistor, &...pulse width Variable 14, C... oscillator. Applicant's agent Kiyoshi Inomata

Claims (1)

[Scope of Claims] 1. A light control device that continuously dims a lighting device, which includes a discharge lamp and a ballast consisting of a series circuit of a capacitor and an inductance, and a light control device that controls the power supply voltage of the lighting device. A light control device comprising a control path, a frequency control circuit for controlling the power supply frequency of the lighting device, and operation means for operating the voltage control circuit and the R-wave number control circuit in conjunction with each other. 2. The light control device according to claim 1, wherein the operating means operates the voltage control circuit and the frequency control circuit simultaneously. 3. The light control device according to claim 1, wherein the operating means continuously operates the voltage control circuit and the frequency control circuit by switching them according to the light control region.