JPS60105435A - Illumination apparatus for growing plant - 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 is for use in promoting plant growth.

This invention relates to a lighting device. 1゜ [Background of the Invention] Green plants have the ability to synthesize organic compounds using carbon dioxide and water as raw materials by absorbing the energy of light, and until the intensity of light reaches the light saturation point. Photosynthesis is promoted almost linearly depending on the intensity of the irradiated light.

The light saturation point for plants is the plant.

It varies depending on the type of food, but these are common vegetables.

It is about 30,000 to 800,001X.

Therefore, extremely high illuminance is continuously provided by artificial lighting.

Artificial cultivation is being carried out in various places to encourage the photosynthesis of plants by feeding them with artificial light. The disadvantage is that it requires a lot of lighting energy.

[Object of the invention] 10 The present invention allows plants to grow efficiently with less lighting energy.

Obtain a lighting device for growing plants that promotes growth.

aimed to.

[Summary of the invention]

It is well known that providing high-intensity artificial lighting to plants promotes photosynthesis and accelerates their growth.
and W, Arnold, A 5eparati
on of the Reactions in Pho
tosynthesis by means ofIn
Termittent Light, 1931) is a law that repeats blinking in a shorter time than when irradiating continuous light.

Dynamic light irradiation can promote the growth rate of plants, and as shown in Figure 1, the irradiation time per cycle is shorter.

It has been shown that the shorter the length, the higher the growth rate ratio. .

Based on the above experimental results of Emerging et al., the present invention provides a lighting device for plant growth that irradiates artificial light to promote photosynthesis in plants. The lamp current of the discharge lamp is increased by comprising an impedance and switching means 10 for intermittently supplying energy from an alternating current power supply to the discharge lamp through the impedance.

With respect to the rated value of , intermittent peak current of 2' or more than rated value and 6 average current of rated current or less.

It was designed to emit a rhythmic light stream.

0 1 U [Embodiments of the Invention] Examples of the present invention will be described with reference to the drawings. Fig. 2 is a circuit diagram showing the first embodiment of the lighting device for growing plants according to the present invention, Fig. 6 is a circuit diagram showing the above-mentioned second embodiment, and Fig. 4 is a circuit diagram showing the above-mentioned sixth embodiment. FIG. 5 is a circuit diagram showing the fourth embodiment, and FIG. 6 is a characteristic diagram showing the relationship between the conduction period and the light emission peak.

FIG. 7 is a circuit diagram showing the fifth embodiment.

be. The first embodiment shown in FIG. 2 is an AC type.

Source 1 is applied to a 5-series circuit consisting of choke coil 2 and capacitor 6, and a high voltage' is applied to capacitor 6.

generate. The voltage generated in the capacitor B is applied to the discharge lamp 5 through the resistor 4, and the discharge lamp 5 is started. Once lit, the discharge lamp 5 is started at a re-ignition voltage lower than the starting voltage, and is stably lit at a voltage lower than the re-ignition voltage. In this way, from AC power supply 1.

Charge the capacitor 6 through the choke coil 2.

When the voltage exceeds the restriking voltage of the discharge lamp 5, a discharge occurs.

Lamp current begins to flow to lamp 5, and the lamp voltage suddenly increases.

15, the discharge current of the capacitor 6 flows from the capacitor 6 to the discharge lamp 5 through the resistor 4. When the voltage phase of the AC power source 1 advances and the voltage of the capacitor 6 becomes less than the lamp voltage of the discharge lamp 5, the lamp current stops flowing, and when the charging voltage of the capacitor 6 becomes more than the re-ignition voltage of the discharge lamp 5. The lamp current begins to flow again. This useless lamp current flows.

The peak current is the average current even if the time when the current is flowing and the time when the current is not flowing are repeated alternately and the average current is equal to or less than the rated current value of the discharge lamp 5.

There is a time when the peak light is emitted due to the current, and a time when no current flows and no light is emitted.

Repeated rhythmic irradiation can be obtained at or below the average current value, making it possible to efficiently promote plant growth with less illumination energy.

In the second embodiment shown in FIG. 3, an AC power supply 1 causes series resonance between a 1° choke coil 2 and a capacitor 6.

When the discharge lamp 5 is restarted after starting, the electric charge in the capacitor 6 is discharged by the resistor 4 and the choke coil 6, thereby reducing the power loss generated in the resistor 4. 1° Similarly to the first embodiment, after the capacitor 6 is discharged, a period of time passes during which no lamp current flows until the charge on the capacitor O becomes equal to or higher than the restriking voltage of the discharge lamp 5, and the capacitor 6 When the charging voltage of the discharge lamp 5 exceeds the re-ignition voltage of the discharge lamp 5, the lamp current flows. As this phenomenon continues repeatedly, it reaches its peak.

The time of peak light emission with current and the time of light emission without current flowing.

Rhythmic irradiation with repeated periods of no light is obtained at or below the average current value.

The sixth embodiment shown in FIG. 4 is a series closed circuit consisting of an AC power source 1, a capacitor 5, a capacitor 7, a resistor 4, and a discharge lamp 5.

and a starting device consisting of a DC power source 9, a resistor 8, and a discharge lamp 5.

The discharge lamp 5 is connected from a DC power supply 9 to a resistor 8.
A high voltage is applied to start the engine. Once started, the discharge lamp 5 is re-ignited at a voltage lower than the starting voltage.

Therefore, the power supply voltage 1 and the discharge voltage of capacitor 7.

When the sum voltage exceeds the re-ignition voltage, the discharge lamp 5 is re-ignited.

When the lamp is ignited and the lamp voltage becomes stable, the sudden drop in starvation voltage causes the voltage from power supply 1 to capacitor 7 to rise.

Current flows to the discharge lamp 5 through the resistor 4, and the capacitor.

7 finishes discharging, the lamp current stops. By repeating the above operation, the time when the lamp current flows with high peak light emission and the time when the lamp current stops passes alternately, and on average, a current equal to or less than the rated current value flows and rhythmically produces high peak light emission. Obtainable.

The fourth embodiment, shown in FIG. 5, uses energy in the discharge lamp.

This is an example in which a transistor is used as a switching means for a reservoir that intermittently supplies power.The AC power supply 1 is converted to DC by a power supply bag device 16 to charge a capacitor 12, and a resistor connected in parallel with the capacitor 12 is used. 4.

In the discharge lamp 5 and transistor 110 circuit, the tiger.

The resistor 11 supplies the discharge lamp 5 with a current that is repeatedly turned on and off in response to a signal from the oscillator 10. .

This current value is determined by the resistor 4 and the impedance of the discharge lamp 5.

is determined by the voltage of the capacitor 12 and the voltage of the capacitor 12. .

In particular, when the output of the power supply device 16 is of a constant current type, an average constant current can be supplied to the discharge lamp 5 regardless of whether the transistor 11 is on or off, or the characteristics of the resistor 4 or the discharge lamp 5. Source of oscillator 10.

By adjusting the power, arbitrary on and off times can be obtained, especially in discharge lamps such as high-pressure sodium lamps and mercury lamps, where the lamp voltage changes little even when the lamp current changes. By keeping the average current supplied to the discharge lamp constant, the lamp power consumption remains constant, and the luminous efficiency of the discharge lamp.

It is possible to operate without deterioration.

Ru. This makes it possible to obtain rhythmic output that matches the rhythmic characteristics that vary from plant to plant.

An experiment in which 100 ■ Metal Halai 5 playing cards were lit using the circuit shown in FIG. 5 will be explained. Meta.

The illuminance provided by the halide lamp is maintained constant.

The input power and the light emission peak value within the conduction period were measured by changing the conduction period of the transistor 11. The results are shown in Figure 6. That is, if the illuminance when the conduction period is 100% and +n input power is 100% is used as a reference, and the light emission peak value at that time is 100%, then as the conduction period is made smaller, the input power decreases in a substantially proportional manner. Furthermore, the luminescence peak value increases as the illuminance is kept constant, and increases exponentially as the conduction period decreases. Reducing the conduction period in this manner reduces the input power to the lamp and increases the peak light emission value. According to experiments, when the conduction period is 20 times, the input power is about 68 times and the light emission peak value reaches about 230%. If this is changed to a power of 100 cm, the luminescence peak value will be approximately 664 times higher.

The reaction in photosynthesis in plants is luminescence.

Assuming that it is proportional to the current value, as shown in this experiment, by performing rhythmic illumination with a conduction period of 20 cm, we can expect about 6.4 times as many photosynthetic reactions as in the case of 100% conduction at the same electric power. The power saving effect is extremely large.

Although the experiment was conducted using intermittent direct current, it is also possible to convert this to alternating current, for example.

A configuration shown in FIG. 7 can be considered. 1. In the fifth embodiment shown in FIG. 7, the discharge lamp 5 is lit by direct current in the fourth embodiment, whereas the discharge lamp 5 is lit by alternating current by using a push pull circuit. It's a Nishida thing. When using a discharge lamp that causes unevenness in the gas filled in the discharge lamp due to direct current lighting, uneven light emission can be prevented by using this embodiment.

Generally, when the power consumption of a discharge lamp decreases below the rated value, the high luminous efficiency inherent to the discharge lamp decreases; however, 8. The lighting according to the present invention as shown in the above embodiments.

In the device, a peak current flows every cycle of the AC power supply.

As a result, higher luminous efficiency can be obtained.

The average luminous efficiency in one cycle of AC power supply is low.

I won't lower it.

〔Effect of the invention〕

Photosynthesis in plants by irradiating artificial light according to the present invention.

The lighting device for promoting plant growth includes an AC power source, a discharge lamp, an impedance that limits the current flowing through the discharge lamp, and an intermittent supply of energy from the AC power source to the discharge lamp through the 1° impedance. supply

The discharge lamp is provided with a means for opening and closing the discharge lamp.

The rated value of the lamp current is higher than the rated value.

− The average current is at or below the rated current.

By passing an electric current intermittently and irradiating it in a rhythmic manner with a peak emitted 1° light accompanying the peak current, photosynthesis of plants can be promoted and effective plant growth can be carried out.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between the irradiation time ratio in one cycle and the plant growth rate ratio, and FIG. 2 is a circuit diagram showing a first embodiment of the lighting device for planting plants according to the present invention. FIG. 6 is a circuit diagram showing the second embodiment, FIG. 4 is a circuit diagram showing the sixth embodiment, and FIG. 5 is a circuit diagram showing the sixth embodiment. A circuit diagram showing the fourth embodiment, FIG. 6 shows the conduction period. A characteristic diagram showing the relationship with the emission peak, Figure 7 is
FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1... AC power supply 6.7... Capacitor (switching means) 4... Resistor 5... Discharge lamp 6... Choke coil 1゜11.19.20... Transistor (switching means) 15
... Choke Coil Representative Patent Attorney Junnosuke Nakamura 0 ・11・ Cow 1 Teruzai Zuko 4 questions/1 week a℃chi question 'A? 2 drawings - Ichiku p dispute ρ 14J report] Tohe soku × Xu

Claims (1)

[Scope of Claim] A lighting device for growing plants that irradiates artificial light to promote photosynthesis of plants, comprising an AC power source and a discharge. A lamp, an impedance for limiting the current flowing through the discharge lamp, and a switching means for intermittently supplying energy from an AC power source to the discharge lamp through the impedance. Plant cultivation l. lighting equipment.