JP3793880B2 - Lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting device, and more particularly to a lighting device that increases visibility by pulse lighting.
[0002]
[Prior art]
Conventionally, there is a lighting device that adds a direct current from an in-vehicle battery and an alternating current generated by an inverter and gives the added current to a light source to make it brighter than when only a direct current is applied (for example, , See Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No. 3080620 (3rd, 4th page, FIG. 2)
[0004]
[Problems to be solved by the invention]
By the way, in the conventional lighting device, the filament is often used in the form of a fine coil due to its nature, and its life is determined by the evaporation rate and the amount of abnormal gas generated inside the sphere to increase the brightness. The voltage is high.
[0005]
In this case, it is also effective to increase the brightness of the indicator lamp by lighting a pulse. As shown in FIG. 4, a general (normal) pulse of a rectangular wave having a constant pulse duration (pulse width) T10 and a constant amplitude A10. When a light-emitting diode as an indicator lamp is driven by P, when the light-emitting diode repeatedly turns on and off, the rise time of the general (normal) pulse P is short (the rise is sharp), so that the inrush current to the light-emitting diode is large. For this reason, there is a problem that the service life of the light emitting diode is shortened.
[0006]
In general, tungsten is used for an electrode such as a discharge tube, and the light bulb is processed into a coil shape to obtain a necessary resistance and emit light (filament). The discharge tube emits light by the discharge of the counter electrode, and in order to increase the brightness, both the power (voltage and current) are increased, but the lifetime is determined by the evaporation rate of tungsten and the amount of impure gas generated.
[0007]
However, when the light emitting diode is turned on with the general (normal) pulse P in FIG. 4, the brightness increases, but the service life of the light emitting diode tends to be shortened due to the inrush current. This is because the general (normal) pulse P has a short rise time (a sharp rise) as shown in FIG. For this reason, as described above, there are disadvantages in that the service life of the light emitting diode is shortened and the power consumption is increased.
[0008]
[Means for Solving the Problems]
Therefore, in order to eliminate the inconveniences described above, the present invention provides a power-conditioning circuit that adjusts direct current or alternating current to a constant current corresponding to the light-emitting diode in a lighting device that lights the light-emitting diode. A rising line that is rounded and gradually rises so that the rising is gentle due to the constant current that has been input, and a horizontal top horizontal line that corresponds to the pulse duration with a constant amplitude, A pulse generation circuit for generating a specific pulse having a falling line that is rounded and gradually falls in a curve so that the fall is gradual is provided, and the pulse generation circuit includes the specific pulse. Is a pulse repetition in which the pulse interval from the end of the fall of the previous specific pulse to the start of the rise of the subsequent specific pulse is a fixed time during which an afterimage effect occurs. Provided with a power control circuit that inputs a specific pulse generated in a period and output from the pulse generation circuit in the pulse repetition period, and the power control circuit is driven by the specific pulse input in the pulse repetition period, The power corresponding to the waveform of the specific pulse is supplied to the light emitting diode in a pulsed manner to blink the light emitting diode.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
This invention has a rising line that is rounded and gradually rises so that the rising is gentle, a horizontal top horizontal line that corresponds to the pulse duration with a constant amplitude, and a slow falling. A specific pulse of a waveform consisting of a rounded and gradually falling falling line from the end of the fall of the previous specific pulse to the start of the rise of the subsequent specific pulse Is generated in a pulse repetition period with a fixed time during which an afterimage effect occurs, and the light corresponding to the waveform of a specific pulse in this pulse repetition period is supplied to the light emitting diode in a pulsed manner to blink the light emitting diode. The rising line of a specific pulse is gradually raised in a curved line to reduce the inrush current to the light emitting diode, thereby extending the service life of the light emitting diode. The falling line of the LED gradually falls in a curved line, and the flashing of the light emitting diode makes it appear brighter than when it is lit with a general (normal) pulse due to an afterimage effect that leaves an afterimage in the eye. Visibility can be increased to increase visibility, and power consumption can be reduced as compared with the case where the light emitting diodes are continuously lit.
[0010]
【Example】
Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 3 show an embodiment of the present invention. In FIG. 1, 2 is a lighting device, 4 is a lighting control means, and 6 is a light emitting diode as an indicator lamp.
[0011]
The lighting control means 4 is used for lighting / extinguishing light sources such as crime prevention lights, such as electric signboards, construction sign poles, road sections, signs, vehicle widths, and the like.
[0012]
The lighting control means 4 is provided with a power supply adjustment circuit (voltage conversion circuit) 8 that adjusts direct current (DC) or alternating current (AC) to a constant current according to the light emitting diode 6. A pulse generation circuit 10 for generating a specific pulse (single pulse) SP by the constant current is provided, and further, a current from the power supply conditioning circuit 8 is input and driven by the specific pulse SP from the pulse generation circuit 10. Thus, a power control circuit (switching circuit) 12 for blinking the light emitting diode 6 is provided.
[0013]
The power adjustment circuit 8 converts, for example, direct current (DC) 1.2 V to 120 V or alternating current (AC) 100 V to 400 V into the constant current according to the light emitting diode 6.
[0014]
The power control circuit 12 is driven by a specific pulse SP of, for example, 10 Hz to 50 KHz from the pulse generation circuit 10, and applies power to the light emitting diode 6 to reduce the inrush current of the light emitting diode 6.
[0015]
The pulse generation circuit 10 receives the constant current from the power adjustment circuit 8 and generates a specific pulse SP.
[0016]
That is, in general, the general (normal) pulse P is a rectangular wave having a constant pulse duration (pulse width) T10 (T) and a constant amplitude A10 (V) as shown in FIG.
[0017]
However, as shown in FIG. 2, the specific pulse SP according to this embodiment has a constant pulse rise time T1 (pulse) from the start of rise (time t1) to the end of rise (time t2) having a constant amplitude A1. Rise time), constant amplitude A1, constant pulse duration (pulse width) T2 ( time t2 to time t3 ), and zero (0) amplitude from the start of falling (time t3) It has a constant pulse fall time T4 (pulse fall time) until the end of fall (time t5).
[0018]
For this specific pulse SP, in order to make the rise moderate, the rise line L1 is rounded R1, the rise line L1 in the diagonally upward direction is gradually raised in a curved line, and the pulse rise time T1 is set to a normal value. In order to make the horizontal top horizontal line L2 corresponding to the pulse duration (pulse width) T2 constant at the amplitude A1 and to make the fall gentle, the pulse rise time is longer than the pulse rise time. A pulse falling time T4 (longer than the normal pulse falling time T3 ( time t3 to time t4 ), which is formed by a waveform in which the falling line L3 in the obliquely downward direction with a roundness R3 is gradually lowered in a curved line. Time t3 to time t5) is obtained and has a combined time H of the pulse rise time T1, the pulse duration T2, and the pulse fall time T4. The pulse rise time T1, the pulse duration T2, and the pulse fall time T4 can be arbitrarily set depending on the type of the indicator lamp 6.
[0019]
Then, as shown in FIG. 3, the specific pulse SP is generated at a constant pulse repetition period C in the pulse generation circuit 10 (time t1-1 to time t1-2). In this case, the second special pulse SP-2, which is the specific pulse after the end of the fall of the first special pulse SP-1, which is the first specific pulse (time t4-1). The pulse interval (section where the amplitude is 0) S until the start of rising (time t1-2) is set to a fixed time in consideration of the afterimage effect.
[0020]
The specific pulse SP generated in such a constant pulse repetition period C is output from the pulse generation circuit 10 to the power control circuit 12 to drive the power control circuit 12. The driven power control circuit 12 supplies power (voltage / current) corresponding to the waveform of the specific pulse SP generated in the pulse repetition period C in the pulse generation circuit 10 to the light emitting diode 6 in a pulsed manner. The light emitting diode 6 blinks, and at this time, due to the afterimage effect that leaves an afterimage in the eye, the light emitting diode 6 appears to be continuously lit to the human eye.
[0021]
Next, the operation of this embodiment will be described.
[0022]
As shown in FIG. 1, for example, when a direct current of 1.2 V to 120 V or an alternating current of 100 V to 400 V is input to the power adjustment circuit 8, the power supply adjustment circuit 8 is connected to the input direct current of 1.2 V to 120 V or AC 100V to 400V is adjusted to a constant current according to the light emitting diode 6, and the adjusted constant current is output to the pulse generation circuit 10.
[0023]
As shown in FIGS. 2 and 3, the pulse generation circuit 10 is gradually rounded with a rounded R1 so that the rise is moderated by a constant current input from the power adjustment circuit 8. A rising line L1 that rises, a horizontal top horizontal line L2 corresponding to the pulse duration T2 with a constant amplitude A1, and a falling that gradually falls in a curve with a rounded R3 so that the falling is gentle. A specific pulse SP having a waveform composed of the line L3 is generated, and this specific pulse SP is converted into a specific pulse SP-2 after the end of the fall of the previous specific pulse SP-1 (t4-1). at the rise of the start (t1-2) pulse interval S to generate a pulse repetition period C for a certain period of afterimage effect occurs, power system a particular pulse SP generated by the pulse repetition period C And outputs it to the circuit 12.
[0024]
The power control circuit 12 is driven by a specific pulse SP of the input pulse repetition period C, and outputs necessary effective power (voltage / current) corresponding to the waveform of the specific pulse SP to the light emitting diode 6. The light emitting diode 6 blinks. At this time, power (voltage / current) corresponding to the waveform of the specific pulse SP is supplied to the light emitting diode 6 in a pulsed manner, the light emitting diode 6 blinks, and the pulse interval (interval of amplitude 0) S Therefore , the light-emitting diode 6 always appears to be lit by human eyes due to the afterimage effect.
[0025]
As a result, a rising line L1 that is gradually curved with a roundness R1 so that the rising is gradual, a horizontal top horizontal line L2 corresponding to the pulse duration T2 with a constant amplitude A1, and a rising edge. A specific pulse SP having a waveform composed of a falling line L3 with a rounded R3 and gradually falling in a curved line so that the fall is gradual from the end of the fall of the previous specific pulse SP-1. The pulse interval S up to the start of the subsequent rise of the specific pulse SP2 is generated in a pulse repetition period C with a fixed time during which an afterimage effect occurs, and power corresponding to the waveform of the specific pulse SP in the pulse repetition period C is pulsed. Since the light-emitting diode 6 is flashed by being supplied to the light-emitting diode 6, the rising line L1 of the specific pulse SP is gradually raised in a curvilinear manner to the light-emitting diode 6. Lowering the input current prolongs the service life of the light emitting diode 6, and gradually lowers the falling line L3 of the specific pulse SP in a curvilinear manner so that an afterimage remains in the eye when the light emitting diode 6 blinks. The effect makes it appear brighter than when it is lit with a normal (normal) pulse, and thus the visibility of the light-emitting diode 6 can be increased to increase the visibility, and the light-emitting diode 6 can be made continuous. As a result, the power consumption can be reduced as compared with the case where the light is turned on.
[0026]
Further, the power adjustment circuit 8 converts, for example, a direct current of 1.2 V to 120 V or an alternating current of 100 V to 400 V into the constant current according to the type of the light emitting diode 6, and thus the visual brightness. Can be increased.
[0027]
Further, the power control circuit 12 is driven by a specific pulse SP of, for example, 10 Hz to 50 KHz from the pulse generation circuit 10 and applies power to the light emitting diode 6, thereby sufficiently reducing the inrush current to the light emitting diode 6. can do.
[0028]
【The invention's effect】
As is clear from the above detailed description, according to the present invention, a power supply adjusting circuit for adjusting a direct current or an alternating current to a constant current corresponding to the light emitting diode is provided, and the rising is caused by the constant current input from the power supply adjusting circuit. A rising line that is gradually rounded and rounded so as to be gentle, a horizontal top horizontal line that corresponds to the pulse duration with a constant amplitude, and a rounding that makes the falling gentle. And a pulse generation circuit for generating a specific pulse having a waveform composed of a falling line that gradually falls in a curved line, and the pulse generation circuit converts the specific pulse to the fall of the previous specific pulse. The pulse interval from the end to the start of the subsequent rise of a specific pulse is generated at a pulse repetition period with a constant time for generating an afterimage effect. A power control circuit for inputting a specific pulse output at a period is provided. The power control circuit is driven by a specific pulse input at the pulse repetition period, and the power corresponding to the waveform of the specific pulse is pulsed. By supplying the light emitting diode to the light emitting diode and flashing the light emitting diode, the rising line of a specific pulse is gradually raised in a curved line to reduce the inrush current to the light emitting diode and extend the service life of the light emitting diode. In addition, the falling line of a specific pulse gradually falls in a curved line, and the light emitting diode blinks to make it appear brighter than when it is lit with a general (normal) pulse due to an afterimage effect that leaves an afterimage in the eye, Therefore, the visibility of the light-emitting diode can be increased and the visibility can be increased, and moreover, the light-emitting diode can be turned on compared to the case where the light-emitting diode is continuously lit. It is possible to reduce the consumption.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of a lighting device.
FIG. 2 is an explanatory diagram of a waveform of a specific pulse in which a rising line and a falling line are rounded to make the pulse width constant.
FIG. 3 is an explanatory diagram of a waveform of a specific pulse generated at a pulse repetition period.
FIG. 4 is an explanatory diagram of a waveform of a conventional general (normal) pulse.
[Explanation of symbols]
2 lighting device 4 lighting control means 6 indicator lamp 8 power supply adjustment circuit 10 pulse generation circuit 12 power control unit SP specific pulse

Claims (1)

  In a lighting device for lighting a light emitting diode, a power adjustment circuit for adjusting a direct current or an alternating current to a constant current according to the light emitting diode is provided, and the rising is slowed by the constant current input from the power supply adjustment circuit. A rising line that is rounded and gradually rises in a curved line, a horizontal top horizontal line that corresponds to the pulse duration with a constant amplitude, and a rounded and curved line that has a gradual fall. And a pulse generation circuit for generating a specific pulse having a waveform consisting of a falling line that gradually falls, and the pulse generation circuit transmits the specific pulse after the end of the fall of the previous specific pulse. Generated at a pulse repetition period in which the pulse interval until the start of the rise of a specific pulse is a fixed time during which an afterimage effect occurs, and the pulse repetition from the pulse generation circuit A power control circuit for inputting a specific pulse output at a period is provided. The power control circuit is driven by a specific pulse input at the pulse repetition period, and the power corresponding to the waveform of the specific pulse is pulsed. The lighting device is characterized in that the light-emitting diode blinks by being supplied to the light-emitting diode.

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