CN103032800A - LED illumination system for classroom - Google Patents

Abstract

The invention discloses an LED (Light-emitting Diode) illumination system for a classroom. The LED illumination system comprises a high-contrast blackboard and an LED lamp, wherein the high-contrast blackboard comprises a writing layer, a long afterglow material layer and a reflective material layer; the LED illumination system comprises an AC (Alternating Current)/DC (Direct Current) conversion power supply, an automatic control unit, a charging relay, a rechargeable accumulator, a supply relay and a low-voltage LED light-emitting device. With adoption of the LED illumination system for the classroom, disclosed by the invention, the contrast of the blackboard in the classroom, as well as the illumination effect in the classroom, is increased on one hand, and the energy consumption of classroom illumination is reduced on the other hand.

Description

A classroom LED lighting system

technical field

The invention relates to a teaching device, in particular to a classroom lighting system.

Background technique

As the country's investment in education continues to increase, education is getting more and more attention, and students' eyesight is declining. Students often worry about not being able to see the demonstration blackboard, so they have to wear glasses in advance, so that students have to start from false Myopia quickly turns into true myopia, which affects the health of the whole people.

There are three reasons:

First, because the smoothness of the blackboard itself is different, the handwriting written with chalk on it is light and shallow;

The second, the hardness difference of chalk is bigger, and the word that the chalk that hardness is higher writes is light and shallow, the pen that the chalk that hardness is lower writes is thick and deep, and writing with chalk has dust pollution in addition, and is harmful to the physical and mental health of teachers and students. There is a certain amount of damage, and it is caused by various reasons such as the influence of ambient light.

Third: At this stage, all schools use fluorescent lamps for lighting. The light source characteristics of fluorescent lamps are discontinuous and flickering light sources, but the naked eye cannot distinguish them. This has a greater impact on the vision of young people, and it is also the main factor causing the frequent occurrence of myopia. It is necessary to design a new blackboard and classroom lighting system to solve the above problems.

In view of the above reasons, a classroom LED lighting system for teaching was invented. The characteristics of this classroom LED lighting system are AC conversion power supply, automatic control circuit, LED lighting device, battery, and long afterglow luminescent material.

Contents of the invention

The object of the present invention is to overcome the above-mentioned shortcomings in the prior art, and provide a classroom LED lighting system. To achieve the following invention purposes: 1. Improve the contrast of the blackboard in the classroom and improve the lighting effect in the classroom. Second, reduce the energy consumption of classroom lighting. In order to realize the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

A classroom LED lighting system, said a classroom LED lighting system includes a high-contrast blackboard and LED lighting;

The high-contrast blackboard includes a writing layer, a long afterglow material layer and a reflective material layer arranged sequentially from outside to inside;

The LED lighting lamp includes: an AC-DC conversion power supply, an automatic control unit, a charging relay, a rechargeable battery, a power supply relay and an LED lighting device;

LED light-emitting devices are respectively arranged around or on the back of the high-contrast blackboard or above the classroom to provide lighting;

Among them, the rechargeable battery is connected to the output terminal of the AC-DC conversion power supply through the charging relay, and connected to the LED light-emitting device in parallel circuit through the power supply relay. The LED light-emitting device is also connected to the AC-DC conversion power supply. Relay and power supply relay connections;

Among them, the AC-DC conversion power supply is used to convert the input AC power into DC power, and the automatic control unit is used to control the work of the charging relay and the power supply relay. Under the power supply relay, when the power of the rechargeable battery is too low, the AC-DC conversion power supply can be connected through the control of the automatic control unit and charged through the charging relay.

Among them, in the high-contrast blackboard, the writing layer is used to write on it with a writing tool that matches the high-contrast blackboard; the long-lasting material layer is used to absorb light and emit light; the reflective material layer is used to play a soft light effect and increase the blackboard. contrast. The high-contrast blackboard of the present invention has high visible contrast of written characters under any light conditions and is free from dust pollution; it can be used as emergency lighting at night and safe evacuation lighting when accidents occur at night in case of power failure.

The luminous flux of the LED light-emitting device is the same under the condition of using commercial power, and the power consumption is 50-75% lower than that of fluorescent lamps, and 90% lower than that of incandescent lamps. When the automatic control unit detects that there is no commercial power, the battery power supply relay is turned on, and the LED lighting device is supplied with power through the unidirectional conduction diode, and the power supply of the LED lighting device is supplied by a rechargeable battery. When the rechargeable battery is fully charged, it can be used for 5-24 hours for the LED lighting. The working time is inversely proportional to the working power of the LED lighting device.

The LED light-emitting device may adopt a tailless power supply method, so that the LED light-emitting device can be directly installed on the desk, so as to fully utilize the light source and save energy.

Through the above technical scheme, the LED lighting can be connected to the AC mains to work, and can also work through the built-in rechargeable battery. Under the control of the charging battery, when the voltage of the charging battery is too low, it will be charged through the charging relay by automatically connecting the AC-DC conversion power supply.

The positive poles of all the LED lamps in the LED lighting device are respectively coupled to the positive poles of the rechargeable battery, charging relay, power supply relay, and AC/DC conversion power supply, and the negative poles are respectively connected to the rechargeable battery, charging relay, power supply relay, AC/DC Invert the negative coupling of the power supply.

The LED lighting lamp also includes an AC switch constant current source controller, the AC switch constant current source controller is connected to the downstream of the AC-DC conversion power supply and is used to adjust the current and voltage output by the AC-DC conversion power supply.

The light source of the LED lighting device adopts LED or OLED, and the light source of LED and OLED adopts standard household light source interface.

The AC-DC conversion power supply also includes a current-measuring resistor coupled to the LED lighting device for measuring the current flowing through the LED lighting device.

The AC-DC conversion power supply adopts an AC switching power supply.

The LED light-emitting device includes more than one light-emitting diode and a current-limiting resistor connected in parallel or in series.

The classroom LED lighting lamp also includes a solar battery or a wind energy power supply, which is converted into direct current or directly connected to a low-voltage direct current power supply and coupled with the LED lighting device.

The positive pole of the LED lighting device is coupled to the positive pole of the solar battery or the wind power supply, and the negative pole of the LED lighting device is coupled to the negative pole of the solar battery or the wind power supply.

The materials used for the long afterglow material layer are fluorescent powder and rare earth fluorescent materials.

The high-contrast blackboard matches writing implements made of high-contrast luminescent writing materials.

In view of the above reasons, a classroom LED lighting system for teaching was invented. The characters written under any light conditions have high visible contrast and no dust pollution; in the case of power failure, it can be used as emergency lighting at night and accidents at night Lighting for safe evacuation.

The luminous flux of the LED light-emitting device is the same under the condition of using commercial power, and the power consumption is 50-75% lower than that of fluorescent lamps, and 90% lower than that of incandescent lamps. When the automatic control unit detects that there is no commercial power, the battery power supply relay is turned on, and the LED lighting device is supplied with power through the unidirectional conduction diode, and the power supply of the LED lighting device is supplied by a rechargeable battery. When the rechargeable battery is fully charged, it can be used by the LED lighting device for 5-24 hours. The working time is proportional to the power of the LED lighting device working at the same time.

A method for illuminating a high-contrast blackboard, comprising the following steps: the first step: the light is transmitted from the writing layer into the long-lasting material layer, and the long-lasting material layer stores the light; the second step: a part of the light is reflected by the reflective layer to enhance the high-contrast blackboard The softness of the light; the third step: when the power is off or at night, the LED lighting device is powered by a rechargeable battery to provide light for the long afterglow material layer and illuminate the high-contrast blackboard; the fourth step, when the power is off or at night When powered, without a rechargeable battery, the long-lasting material glows to illuminate a high-contrast blackboard.

Compared with prior art, the beneficial effect of the present invention :

1. Improve the contrast of the blackboard in the classroom and improve the lighting effect in the classroom.

Second, reduce the energy consumption of classroom lighting.

3. The LED light-emitting device adopts a standard interface, which can reduce the use of power lines, avoid damage to the existing circuit structure, and reduce the initial cost of the user, thereby saving and reducing the use of non-ferrous metals.

4. Low-voltage centralized power supply can greatly reduce the difficulty of manufacturing LED lighting devices, simplify the process, greatly reduce the use of electrolytic aluminum and plastics, and reduce the consumption of raw materials.

5. The use of LED lighting devices includes lighting and supplementing the background of the high-contrast blackboard; since the light emitted by the light source is continuous, it plays a role in protecting eyesight.

Description of drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of the present invention.

Marks in the figure: 1-AC-DC conversion power supply, 2-charging relay, 3-rechargeable battery, 4-power supply relay, 5-automatic control unit, 6-LED lighting device, 7-writing layer, 8-long afterglow material layer , 9-reflective material layer.

Detailed ways

The present invention will be further described in detail below in conjunction with test examples and specific embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

A classroom LED lighting system, the system may include one or more parallel subsystems, and has various implementation modes;

A classroom LED lighting system, said a classroom LED lighting system includes a high-contrast blackboard and LED lighting;

As shown in Figure 1, the high-contrast blackboard includes a writing layer 7, a long afterglow material layer 8 and a reflective material layer 9 arranged sequentially from outside to inside;

As shown in Figure 2, the LED lighting lamp includes: AC-DC conversion power supply 1, automatic control unit 5, charging relay 2, rechargeable battery 3, power supply relay 4 and LED lighting device 6;

LED light-emitting devices are respectively arranged around or on the back of the high-contrast blackboard or above the classroom to provide lighting;

Among them, the rechargeable battery is connected to the output terminal of the AC-DC conversion power supply through the charging relay, and connected to the LED light-emitting device in parallel circuit through the power supply relay. The LED light-emitting device is also connected to the AC-DC conversion power supply. Relay and power supply relay connections;

Among them, in the high-contrast blackboard, the writing layer is used to write on it with a writing tool that matches the high-contrast blackboard; the long-lasting material layer is used to absorb light and emit light; the reflective material layer is used to play a soft light effect and increase the blackboard. contrast. The high-contrast blackboard of the present invention has high visible contrast of written characters under any light conditions and is free from dust pollution; it can be used as emergency lighting at night and safe evacuation lighting when accidents occur at night in case of power failure.

Among them, the AC-DC conversion power supply is used to convert the input AC power into DC power, and the automatic control unit is used to control the work of the charging relay and the power supply relay. Under the power supply relay, when the power of the rechargeable battery is too low, the AC-DC conversion power supply can be connected through the control of the automatic control unit and charged through the charging relay.

Among them, the positive pole of the LED lighting device is coupled with the positive pole of the automatic control unit and the AC-DC conversion power supply, charging relay, power supply relay, solar battery, etc., and the negative pole of the LED lighting device is connected with the automatic control unit and the AC-DC conversion power supply, charging relay and power supply relay. , negative coupling of solar cells, etc. AC 150-264V mains power is converted to 12VDC voltage through the AC-DC conversion power supply of the switching power supply, and the LED lighting device is powered by a unidirectional conduction diode. When the LED lighting lamp uses the mains power supply, the luminous flux is the same, and the power consumption is 50-50% less than that of the fluorescent lamp. 75%, saving 90% compared with incandescent lamps. When the automatic control unit detects that there is no commercial power, the battery power supply relay is turned on, and the LED lighting device is supplied with power through the unidirectional conduction diode, and the power supply of the LED lighting device is provided by a rechargeable battery. When the rechargeable battery is fully charged, it can be used by the LED lighting device for 5-24 hours. The working time is inversely proportional to the working power of the LED lighting device.

The LED light-emitting device may adopt a tailless power supply method, so that the LED light-emitting device can be directly installed on the desk, so as to fully utilize the light source and save energy.

The automatic control unit is controlled by special software. The automatic control unit detects the voltage of the rechargeable battery, and when the detected voltage is lower than 11V, the AC-DC conversion power supply charges the rechargeable battery through the charging relay. The automatic control unit detects the working condition of the LED lighting device by detecting the current of the AC and DC power supply. When the load of the LED lighting device does not exceed 50% of the rated value, the charging relay is allowed to be turned on to charge the rechargeable battery. In order to ensure the safe operation of the system, the power charging conditions can be set.

The automatic control unit also detects the charging current of the rechargeable battery through the AC-DC conversion power supply. When the charging current is greater than 150% of the rated charging current, the charging relay is disconnected and the charging is stopped; The battery continues to be charged, if the battery is damaged, and the damaged battery is repaired at the same time. When it is detected that the charging current is less than 5% of the rated charging current or the accumulative charging time exceeds or reaches 8 hours, the charging relay will be automatically disconnected to stop charging the battery.

If solar energy is used for charging, the solar battery charges the rechargeable storage battery through a unidirectional conduction diode, and then the rechargeable storage battery supplies power to the LED lighting device through a power supply relay. The intermediate voltage conversion link is omitted to improve efficiency. The rechargeable storage battery directly supplies power to the LED lighting device, so as to ensure that the voltage of the rechargeable storage battery is relatively stable, thereby ensuring the stable operation of the LED lighting device.

The power of the AC-DC conversion power supply is determined according to the capacity of the rechargeable storage battery and the power of the LED lighting device.

The high-contrast blackboard uses the propagation characteristics of light, combined with the characteristics of a new type of polymer transmission material and long-lasting fluorescent light-emitting materials, to achieve high-contrast performance of the writing written on the blackboard, making it easy for people to see, and LED The light-emitting device is combined with the fluorescent light-emitting material of the long afterglow material layer; it ensures the continuity of the light and no flicker, thereby achieving the effect of protecting eyesight;

At the same time, long afterglow fluorescent luminescent materials can be used as low-light lighting at night. After receiving light for a certain period of time, the long afterglow fluorescent luminescent materials will turn off the power supply or light source; When the brightness of the light is high, the long-afterglow fluorescent luminescent material will release a limited light source for about ten hours, and the light intensity will gradually decay with time.

Although specific embodiments of the present invention have been illustrated and described, it does not mean that all possible forms of the present invention are characterized by the illustrations and descriptions of the above embodiments. Rather, the words used in the specification are descriptive and Without limitation, it is understood that many changes may be made in the invention without departing from the spirit and scope of the invention.

Claims (10)

1. A classroom LED lighting system, characterized in that, said classroom LED lighting system comprises a high-contrast blackboard and LED lighting; The high-contrast blackboard includes a writing layer, a long afterglow material layer and a reflective material layer arranged sequentially from outside to inside; The LED lighting lamp includes: an AC-DC conversion power supply, an automatic control unit, a charging relay, a rechargeable battery, a power supply relay and an LED lighting device; LED light-emitting devices are respectively arranged around or on the back of the high-contrast blackboard or above the classroom to provide lighting; Among them, the rechargeable battery is connected to the output terminal of the AC-DC conversion power supply through the charging relay, and connected to the LED light-emitting device in parallel circuit through the power supply relay. The LED light-emitting device is also connected to the AC-DC conversion power supply. Relay and power supply relay connections; Among them, the AC-DC conversion power supply is used to convert the input AC power into DC power, and the automatic control unit is used to control the work of the charging relay and the power supply relay. Under the power supply relay, when the power of the rechargeable battery is too low, the AC-DC conversion power supply can be connected through the control of the automatic control unit and charged through the charging relay. 2. A classroom LED lighting system according to claim 1, wherein said classroom LED lighting lamp further comprises an AC switch constant current source controller, and said AC switch constant current source controller is connected to an AC Downstream of the DC conversion power supply and used to regulate the current and voltage output by the AC-DC conversion power supply. 3. The classroom LED lighting system according to claim 1, wherein the light source of the LED lighting device is LED or OLED. 4. A classroom LED lighting system according to claim 1, wherein the AC-DC conversion power supply further comprises a current-measuring resistor, and the current-measuring resistor is coupled to the LED lighting device for measuring the current flowing through the LED lighting device. The current of the LED lighting device. 5. A classroom LED lighting system according to claim 1, wherein the AC switching power supply is an AC switching power supply. 6. A classroom LED lighting system according to claim 1 or 3, wherein the LED lighting device comprises more than one light-emitting diode and a current-limiting resistor connected in parallel or in series. 7. A classroom LED lighting system according to claim 1, wherein the LED lighting lamp also includes a solar battery or a wind energy power supply, and the solar battery or wind energy power supply is converted into direct current or directly connected to a low voltage The DC power supply is coupled with the LED lighting device. 8. A classroom LED lighting system as claimed in claim 7, characterized in that, the positive pole of the LED lighting device is coupled to the positive pole of the solar battery or wind energy power supply, and the negative pole of the LED lighting device is coupled to the Negative coupling of solar cell or wind power supply. 9. The classroom LED lighting system according to claim 1, wherein the material used in the long afterglow material layer is phosphor powder. 10. A lighting method for a high-contrast blackboard, comprising the following steps, the first step: the light is transmitted from the writing layer into the long afterglow material layer, and the long afterglow material layer stores the light; the second step: a part of the light passes through the reflective layer Reflection to enhance the softness of light on the high-contrast blackboard; the third step: when the power is out or at night, the LED lighting device is powered by a rechargeable battery to provide light for the long-lasting material layer and illuminate the high-contrast blackboard; the fourth step , When the power is out or at night, in the absence of rechargeable batteries, the long afterglow material glows to illuminate the high-contrast blackboard.

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