JPS59128798A - Light compensating unit for high intensity discharge 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 the Invention) The present invention relates to a light compensation device for a high-intensity discharge lamp that compensates for the luminous flux of an illumination lamp consisting of a high-intensity discharge lamp, and particularly relates to a light compensation device for a high-intensity discharge lamp that compensates for the luminous flux of an illumination lamp consisting of a high-intensity discharge lamp. The present invention relates to a light compensation device for a high-intensity discharge lamp when compensation is performed.

(Background of the Invention) High-intensity discharge lamps such as metal halide lamps and mercury lamps have the advantage of higher efficiency than incandescent lamps, but on the other hand,
It has the disadvantage that the luminous flux rises slowly during startup and after startup. Therefore, in order to perform so-called instantaneous lighting, a halogen lamp with a fast rise in luminous flux is added to the high-intensity discharge lamp lighting device as an auxiliary light source, so that the main illumination, that is, the high-intensity discharge lamp, is lit and the luminous flux exceeds a predetermined level. Optical compensation is performed by turning on the auxiliary light source.

By the way, many such instantaneous lighting devices have been proposed in the past that use a single light compensation device for a single high-intensity discharge lamp lighting device. If you try to perform optical compensation for multiple lamps (two or more lamps), you will need to use one optical compensation device for each discharge lamp lighting device, which increases the cost and increases the size of the device. there were.

(Object of the invention) The object of the present invention is to solve the problems of the conventional type described above.
In a high-intensity discharge lamp light compensation device that compensates for the luminous flux of a plurality of main lighting lights made of high-intensity discharge lamps, a light compensation device is provided corresponding to each of the main lighting lights to detect that all of the main lighting lights are turned on. Based on the concept of controlling all auxiliary light sources to be turned off at once, the present invention aims to simplify the configuration of the device, thereby reducing the size and cost of the device.

(Structure of the Invention) In order to achieve the above object, the present invention provides a light compensation device for a high-intensity discharge lamp that compensates luminous flux at the time of starting and restarting a plurality of main illumination lights each consisting of a high-intensity discharge lamp. an auxiliary light source provided corresponding to each of the main illumination lights, a lighting state detection circuit that detects the lighting state of each of the main lighting lights, and lighting the auxiliary light sources when power is applied to the main lighting lights and detecting the lighting state The present invention is characterized by comprising an auxiliary light source control circuit that turns off the auxiliary light source after detecting that all of the main illumination lights are turned on based on the output of the detection circuit.

(Explanation of Examples) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an instantaneous lighting device to which a light compensation device for a high-intensity discharge lamp according to an embodiment of the present invention is applied. In the figure, reference numeral 1 denotes an AC or DC power source, such as an AC power source such as a commercial power source, a DC power source consisting of an AC power source, and a smooth or non-smooth rectifier circuit, or a battery. 2.2- is a ballast such as a high frequency lighting circuit (electronic ballast) or a ballast, 3
, 3' are high-pressure high-intensity discharge lamps such as metal halide lamps and high-pressure mercury lamps as main illumination lights, and these ballasts 2
The discharge lamp 3, the ballast 2', and the discharge lamp 3' together with the power source 1 constitute a well-known high-intensity discharge lamp lighting device. 4. 4' is an auxiliary light source such as a halogen lamp or incandescent lamp whose luminous flux rises quickly, and 5 is an optical compensation circuit.
These auxiliary light sources 4, 4' and the optical compensation circuit 5 constitute an optical compensation device for a high-intensity discharge lamp, which is a feature of the present invention.

An auxiliary light source 4.4- is provided corresponding to each of the discharge lamps 3.3', and is controlled by a light compensation circuit 5 to adjust the luminous flux at the time of starting and restarting these discharge lamps 3, 3'. Compensate for. The light compensation circuit 5 includes a lighting state detection circuit that detects the lighting state of each of the discharge lamps 3 and 3, and a lighting state detection circuit that lights up the auxiliary light sources 4 and 4' when the power supply 1 is turned on, and also lights up the discharge lamp based on the output of the lighting state detection circuit. An auxiliary light source control circuit is provided which turns off the auxiliary light 14.4- after detecting that all of the lights 3 and 3' are turned on.

FIG. 2 is a block diagram of an instantaneous illumination device that more specifically shows an embodiment of the optical compensation device for a high-intensity discharge lamp according to the present invention. Note that the same reference numerals are given to the parts common to or corresponding to those of the apparatus shown in FIG. 1, and the description thereof will be omitted.

In FIG. 2, the optical compensation circuit 5 is connected to the lighting state detection circuit 6.
6' and an auxiliary light source control circuit 7.

In the lighting state detection circuit 6, a current transformer 61 generates an electromotive voltage proportional to the lamp current of the high-intensity discharge lamp 3 flowing through its primary winding, and a rectifier consisting of diodes 62, 63, a resistor 64, and a capacitor 65 The smoothing circuit 6- generates a voltage obtained by rectifying and smoothing the secondary winding induced voltage of the current transformer 61. The inverted Schmitt trigger circuit 66 compares this voltage with a predetermined threshold, and outputs a level "H" if the voltage is lower than the threshold, and outputs a level "[" if it is higher than the threshold. .

Thereby, the lighting state detection circuit 6 detects the lighting state of the discharge *T3, that is, the luminous flux level, based on the voltage, that is, the lamp current (average value) of the discharge lamp 3, and when the luminous flux level exceeds a predetermined value, the lighting state detecting circuit 6 detects the lighting state of the discharge *T3, that is, the luminous flux level. When the luminous flux level is below a predetermined value, a light-off detection signal of level "11" is generated.

Diodes 67 and 68 are Schmitt trigger circuit 66
This is to protect the device from noise such as surge voltage.

The lighting state detection circuit 6' has the same structure as the lighting state detection circuit 6 except that it detects the lamp current of the discharge lamp 3', so common parts are numbered with the same number followed by a dash. The explanation will be omitted by showing it.

In the auxiliary light source control circuit 7, the logic circuit 71 includes L I
It operates as a negative logic NAND circuit for the lighting detection signal of the I level, and as a positive logic NOR circuit for the lighting detection signal of the '1'' level.
When both of discharge lamps 3 and 3' are lit and both of the lighting state detection circuits 6 and 6' generate a lighting detection detection signal of 11 L II level, an AND output of 11 Hj level is generated, and the discharge lamps 3 and 3 ' goes off and the lighting state detection circuit 6 or 6' generates a light-off detection detection signal of 'H' level, it generates an OR output of 11L I+ level. The differentiating circuit differentiates the rising edge of the JIHTT level logic and the inverted Schmitt trigger circuit 7.
4 shapes this differential waveform to generate a pulse of l L I+ level. This pulse is supplied to the timer circuit 15 as a timer start signal, and the timer circuit 75 sets its output, resets the time value, and starts time measurement. The inverter 76 converts the OR output of the gate circuit 71 into "
The differential circuit and inverted Schmitt trigger circuit 79 consisting of the capacitor 11 and the resistor 78 differentiate, shape and invert the rising edge of the OR output which has been inverted to the "H" level. Generate L'' level pulse.

This pulse is supplied to the timer circuit 75 as a reset signal, and when the output of the timer circuit 15 is at the H''' level, it is forcibly reset.
lamp current detection by turning on the auxiliary light sources 4 and 4' for a certain period of time sufficient for the luminous flux to rise even after the lighting of the discharge lamp 3 is detected, and preventing a lack of luminous flux after starting until the luminous flux rises. The level tolerance has been increased to make lighting detection easier.

Next, the operation of the instantaneous lighting system shown in FIG. 2 will be explained with reference to the voltage and current waveforms shown in FIG. 3.

First, when the power switch 9 is turned on at time to, the lighting circuits 2 and 2' start preheating the discharge lamp 3.3'. At this time, the lamp current of the discharge lamp 3.3' is zero (Figures A and B), so in the lighting state detection circuit 6°6', the current transformer 67
, 61'' is sufficiently lower than the threshold of the Schmitt trigger circuits 66, 66-, and the voltage induced in the secondary winding 1 of the circuits 66, 66
-, that is, the output of the lighting 9- state detection circuits 6 and 6' are both at the "H" level (Figures C and D). Therefore, in the auxiliary light source control circuit 7, the output of the logic circuit 71 is 'L'. ” (Figure E), the output of the inverter 76 is “)-1”, and the output of the OR circuit 80 is “H”.
'', the transistor 81 is turned on, the relay 82 is driven, the contact 8 is closed, and the power source 1 turns on the auxiliary light source 4.
．． 4' lights up (]] figure).

Next, after the discharge lamp 3 has been preheated for, for example, 2 to 3 minutes, it starts up (Figure A, time t1), the lamp current of the discharge lamp 3 exceeds a predetermined value IL (Figure A, time t2), and the current transformer 61 The rectified and smoothed voltage induced in the secondary winding of the Schmitt trigger circuit 6
When the threshold value of 6' is exceeded, the lighting state detection circuit 6 generates a lighting detection signal of ``extra level'' (Figure 0, time [2
). However, discharge lamp 3' has not started yet (Figure B)
, the output of the lighting state detection circuit 6' remains at the 'H'° level (Fig. D). Therefore, the output of the logic circuit 71 is “[
As mentioned above, the output of the inverter 76 is "H", the output of the OR circuit 80 is "l-1", the transistor 81 and the relay 82 are on, the contact 8 is closed,
10- The auxiliary light source 4.4' remains on (Figure H).

Then, when the discharge lamp 3' starts up (Figure B, time t1'), the lamp current exceeds a predetermined value IL- (Figure B, time t2').
), the lighting state detection circuit 6' detects the lighting of the discharge lamp 3' and generates a lighting detection signal of "L" level (time t2' in Figure D). Therefore, the two inputs of the logic circuit 71 both go to the "L" level (Figures C and D), and generate an AND output of the "H" level (Figure E). The rising edge of this AND output is differentiated by a differentiating circuit consisting of a capacitor 12 and a resistor 73, and then waveform-shaped and inverted by a Schmitt trigger circuit 14 (Fig. E), and is supplied to a timer circuit 75 as a start signal. As a result, the timer circuit 15
The clock value is cleared and a “H” level output is generated (G
(Fig.) and starts timing. In this case, inverter 7
The output of the timer circuit 75 is "L" level, but one input terminal of the OR circuit 80 is the "H" level output of the timer circuit 75 (Figure G).
is applied, the output of the OR circuit 80 is "H"
H'' level - 82 contact 8 is closed circuit, auxiliary light 1!! 4.4
- remains lit (Figure H).

Subsequently, when the timer circuit 15 finishes counting the predetermined time and the output reaches the "L" level (t3 in Figure G), the OR circuit 8
At 0, both inputs are at "L" level and the output is 111.
When the voltage becomes I+, the relay 82 is deenergized, the relay contact 8 is opened, and the auxiliary light sources 4 and 4' are turned off (Figure H).

Next, the operation of t4) 41 in Figure A when the discharge lamp 3 is turned off will be explained.

In this case, the lamp current of the discharge lamp 3 becomes zero (Fig. A, t
4 to [5], the output of the lighting state detection circuit 6 becomes "H" level. Therefore, the OR inverted output of the logic circuit 71 is
'' level, the relay 82 is energized as described above ([0 to t2'), the contact 8 is closed, and the auxiliary light source 4.4' is turned on (Figure 11).When the discharge lamp goes out, the lamp While the temperature is high, the gas pressure inside the lamp is high and the restriking voltage is high, so it does not restart immediately.For this reason, the discharge lamp 3 gradually cools down and the restriking voltage of the lighting device 2 increases. It restarts only when it becomes lower than the no-load output voltage (Fig. A, t5).In this case (after t5), when starting (t1
Since the process and operation are the same as in (hereinafter), the explanation will be omitted.

Next, the operation when the discharge lamp 3- goes out while the output of the timer circuit 75 is at the "H" level (Figure B, t7) will be explained. In this case, the lighting state detection circuit 6 is set to 11 H11.
After a level extinction detection signal is generated and the output of the timer circuit 15 is forcibly reset, the operation is similar to the case where the discharge lamp 3 is extinguished (t4 in Fig. A) described above.

This instantaneous lighting device turns off the auxiliary light source after detecting that all of the plurality of lighting lights are turned on, and also turns off all the auxiliary light sources when at least one of the lighting lights goes out or goes out. Because it can be turned on, it is suitable for use in automobile headlights, for example, because even if one of the main lighting lights goes out due to a malfunction, the auxiliary light source will turn on and the headlight will not be visible on one side, making it safer. .

It should be noted that the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications without departing from the spirit of the present invention. For example, in the above embodiment, each main illumination light is composed of one discharge lamp, but
Any or all of the main illumination lights may be composed of two or more discharge lamps. In addition, in the above description, each main lighting lamp is driven by one lighting circuit, but for example, each of the two discharge lamps of a two-lamp type discharge lamp lighting device is driven by one lighting circuit, and two main lighting lamps are used. One ballast may be used for multiple main illumination lights, such as when used as a ballast. Furthermore, in the above description, the lighting state of each main illumination lamp is detected by the lamp current value, but other known methods for detecting the lamp voltage, power, illuminance, luminous flux, etc. of the discharge lamp 3.3' may be used. It's okay.

(Effects of the Invention) As described above, according to the present invention, since the auxiliary light sources provided for each of the plurality of illumination lights are collectively controlled by one optical compensator 4, the configuration of the device is is simplified, and the device can be made smaller and lower in cost.

14-

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an instantaneous lighting device to which a high-intensity discharge lamp light compensation device according to an embodiment of the present invention is applied, and FIG. 2 is a block diagram of a high-intensity discharge lamp light compensation device according to an embodiment of the present invention. FIG. 3 is a block diagram of the instantaneous illumination device showing more specifically the optical compensation circuit portion of the device, and FIG. 3 is a waveform diagram of each part of the optical compensation circuit of FIG. 2. 1...power supply, 2.2-...ballast, 3.3-...
...High intensity discharge lamp (main illumination lamp), 4.4-...Auxiliary light source, 5...Light compensation circuit, 6,6'...Lighting state detection circuit, 7...Auxiliary light source control circuit , 8...Relay contact, 61゜61'...Current transformer, 71...N
OR circuit (negative logic, NAND circuit). Patent applicant Toshiba Electric Materials Corporation Patent applicant Toshiba Corporation Agent Patent attorney Tatsuo Ito Agent Patent attorney Tetsuya Ito 15- Figure 1

Claims (1)

[Scope of Claims] 1. A light compensation device for a high-intensity discharge lamp that compensates the luminous flux during starting and restarting of a plurality of main illumination lamps consisting of high-intensity discharge lamps, which is provided corresponding to each of the main illumination lamps. a lighting state detection circuit that detects the lighting state of each of the auxiliary light source and the main lighting lamp; and a lighting state detection circuit that turns on the auxiliary light source when power is applied to the main lighting light and based on the output of the lighting state detection circuit. A light compensation device for a high-intensity discharge lamp, comprising: an auxiliary light source control circuit that turns off the auxiliary light source after detecting that all of the main illumination lights are turned on. 2. The lighting state detection circuit generates a lighting detection signal when the luminous flux of each of the main lighting lamps exceeds a predetermined level, and the auxiliary light source control circuit generates a lighting detection signal by calculating the AND of the lighting detection signals. A light compensation device for a high-intensity discharge lamp according to claim 1, which detects whether any of the main illumination lights are turned on. 3. The lighting state detection circuit generates a light-off detection signal when the luminous flux of each of the main illumination lights falls below a predetermined level, and the auxiliary light source control circuit generates a light-off detection signal by calculating the logical sum of the light-off detection signals. The light compensation device for a high-intensity discharge lamp according to claim 1 or 2, wherein the auxiliary light source is turned on when it is detected that at least one of the main illumination lights is turned off. 4. Claim 1, wherein the lighting state detection circuit detects the lighting state based on the lamp current of the main illumination lamp.
．． A light compensation device for a high-intensity discharge lamp according to item 2 or 3.