CN202918543U

CN202918543U - LED (Light-Emitting Diode) lamp set with over-temperature protection function

Info

Publication number: CN202918543U
Application number: CN 201220525531
Authority: CN
Inventors: 刘忠祺; 苗强
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-10-15
Filing date: 2012-10-15
Publication date: 2013-05-01
Anticipated expiration: 2022-10-15

Abstract

The utility model relates to an LED lamp set with an over-temperature protection function, comprising at least one LED lamp, a driver electrically connected with the LED lamp, a temperature switch arranged between the LED lamp and the driver, and a current-limiting resistor in parallel connection with the temperature switch. When the temperature of the LED lamp exceeds a temperature value set by the temperature switch, the temperature switch is disconnected, power supplied by the driver can still maintain the LED lamp in a connected and lighted state via the current-limiting resistor, and by reducing current and voltage, the temperature generated by the LED lamp can be greatly reduced, thereby avoiding that life of the LED lamp is shortened due to overheating of the LED lamp or surge voltage generated in the connecting moment, as well as avoiding inconvenience caused by that the LED lamp goes out instantly.

Description

LED lamp group with overheat protector function

Technical field

The utility model relates to a kind of LED lamp group design, particularly a kind of LED lamp group with overheat protector function.

Background technology

Light-emitting diode (light emitting diode is called for short LED) is a kind of small-sized, solid state light emitter that luminous efficiency is high, because light-emitting diode is semiconductor subassembly, its long service life, stability height, be suitable as various light source, such as purposes such as lighting decoration controlled, display screen light source, backlight light source, traffic signal light, emergency exit indicator lights.

Although it is few that the light that the LED lamp sends contains the infrared ray composition, therefore, compare with lamp bulb, bulb type fluorescence lamp, the light irradiation heats up slower, but owing to LED lamp self can generate heat, in case and heat history is when surpassing the allowable temperature of LED lamp, the LED lantern festival has the possibility of permanent destruction, thus to find out a method, before the LED light temperature is too high, manage the cooling of this LED light temperature, too high and produce and damage to avoid this LED light temperature.

Consult Fig. 1, existing LED lamp group 1 with overheat protector function includes the driver 12 that a LED lamp 11, is electrically connected these LED lamps 11, and a temperature switch 13 of being located at 12 of this LED lamp 11 and drivers; Wherein, this temperature switch 13 has a preset temperature numerical value, but so that the temperature that this LED lamp of this temperature switch sensing produces, be open circuit so as to controlling this temperature switch, closed circuit state is switched, that is the temperature that produces of this LED lamp 11 is when surpassing this preset temperature numerical value, and this temperature switch 13 namely can produce and disconnect and be open-circuit condition, makes the electric current of this driver 12 be unable to supply this LED lamp 11, then this LED lamp 11 namely can extinguish, so as to reducing the temperature of this LED lamp 11; Otherwise, when these LED lamp 11 temperature were reduced in the preset temperature numerical value of this

temperature switch

13,13 of this temperature switches can return to closed circuit state, made the electric current of this driver 12 be able to by temperature switch 13 and delivered on the LED lamp 11, so that this LED lamp 11 presents lighting lamp state, so repeatedly.

But, find that it easily has following disappearance after this existing LED lamp group 1 actual use, details are as follows hereby:

1, since this temperature switch 13 along with these LED lamp 11 variations in temperature, borrow in good time open circuit and closed circuit with the bright light of controlling this LED lamp 11 or the state of turning off the light, so repeatedly open and close in the situation of this LED lamp 11, its surge voltage that produces when conducting causes 11 life-spans of this LED lamp to reduce easily, real must the improvement.

2 moreover, this temperature switch 13 forms open-circuit conditions and when this LED lamp 11 is extinguished, for this LED lamp 11 take illumination as purpose, environment that this LED lamp 11 is illuminated is formed dark state, cause outside the suitable inconvenience of user of service, and this LED lamp 11 is when extinguishing because of excess Temperature, also allow easily the user of service think that this LED lamp group 1 belongs to fault by mistake, and then just carry out this LED lamp group 1 and eliminate and change operation, the real situation that easily causes unspoiled LED lamp group 1 to be replaced, to be improved.

The utility model content

Therefore; the purpose of this utility model is to provide a kind of LED lamp group with overheat protector function; it can make the LED lamp under over-temperature condition; still can keep lighting lamp state; can effectively reduce the protection effect of this LED light temperature, and then reach and greatly promote useful life, avoid changing improperly situation and the effect such as easy to use.

For reaching above-mentioned purpose, solution of the present utility model is:

A kind of LED lamp group with overheat protector function, it includes at least one LED lamp, and one is electrically connected the driver of this LED lamp, and a temperature switch of being located between this LED lamp and driver; Wherein, this temperature switch has a preset temperature numerical value, but so that the temperature that this LED lamp of this temperature switch sensing produces, be open circuit so as to controlling this temperature switch, closed circuit state is switched, this temperature switch is parallel with a current-limiting resistance, when it made this temperature switch be open-circuit condition, the electric power that this driver is supplied still can and make this LED lamp be the conducting lighting lamp state by this current-limiting resistance.

After adopting said structure, when this LED light temperature surpasses the Temperature numerical that this temperature switch sets, and when making this temperature switch be open-circuit condition, then the electric power supplied of this driver still can see through this current-limiting resistance, after reducing electric current and voltage, transport on this LED lamp, and make this LED lamp keep the conducting lighting lamp state, reduce the temperature of this LED lamp, until temperature is when being reduced to the temperature range of this temperature switch, this electric power directly see through this temperature switch again and with this LED lamp conducting, make this LED lamp reply brightness originally, except can avoiding existing LED lamp moment to extinguish the user of service's that causes the inconvenience, or the mistake LED lamp that will extinguish thinks fault and abandons, and causes outside the generation of improperly replacing situation, the surge voltage that more can avoid simultaneously this LED lamp to produce because of overheated or conducting moment, and cause shorten the useful life of this LED lamp.

Description of drawings

Fig. 1 is existing LED lamp group calcspar;

Fig. 2 is the calcspar of existing LED lamp group action specification;

Fig. 3 is the calcspar of the utility model one preferred embodiment;

Fig. 4 is the calcspar of the utility model one preferred embodiment action specification;

Fig. 5 is the calcspar of the utility model one preferred embodiment action specification.

[primary clustering symbol description]

3 LED lamp groups, 31 LED lamps

32 drivers, 33 temperature switches

34 current-limiting resistances.

Embodiment

In order further to explain the technical solution of the utility model, the utility model is elaborated below by specific embodiment.

Consult Fig. 3, the utlity model has a preferred embodiment of the LED lamp group 3 of overheat protector function, it includes at least one LED lamp 31, one is electrically connected the driver 32 of this LED lamp 31, one is located at the temperature switch 33 of 32 of this LED lamp 31 and drivers, and a current-limiting resistance 34 in parallel with this temperature switch; Wherein, this LED lamp 31 can be single design in the present embodiment, perhaps forms with plural LED lamp 31 serial connections, and following present embodiment is namely take LED lamp string as example, and to select electric current 700mA, operating voltage be that 27V is the example explanation to this LED lamp 31 simultaneously; In addition, in present embodiment, this driver 32 is selected input fixed current 700mA, and ceiling voltage 32V is the example explanation.

Still continuous aforementioned, this temperature switch 33 has a preset temperature numerical value, and temperature switch 33 commonly used often with 70 ℃ for imposing a condition, that is the temperature that produces of this LED lamp 31 is when surpassing the preset temperature numerical value that this temperature switch 33 sets, this temperature switch 33 causes this LED lamp 31 and the electric connection of driver 32 to present dissengaged positions because being subjected to high thermal impact to form open-circuit condition; Otherwise in the time of in this LED lamp 31 temperature reduce and return back to the preset temperature numerical value that this temperature switch 33 sets, this temperature switch 33 namely can form closed circuit state, and what make this LED lamp 31 and driver 32 electrically presents again connection status; Moreover, this current-limiting resistance 34 can be selected, install according to the consumption wattage of this LED lamp 31, and present embodiment select mode will be input into current limit in this LED lamp 31 to original 50% take interior as main, so can reach these LED lamp 31 brightness and caloric value and all reduce purpose, so this current-limiting resistance 34 of present embodiment is to select 110 ohm and 220 ohm of specifications for it.

Consult Fig. 4, during use, when these LED lamp 31 temperature are normal, 33 of this temperature switches present closed circuit state, so electric power of this driver 32 (such as the imaginary arrow line among the figure), then directly transfer on this LED lamp 31 via this temperature switch 33, normally to light this LED lamp 31, namely this driver 32 directly promotes the LED lamp with constant current mode 700mA (C/C for short 700mA), driver 32 can because of current saturation at 700mA, so can automatically be depressured to 27V output, the consumed power of LED lamp 31 is 18.9W at this moment.

Consult Fig. 5, when these LED lamp 31 temperature surpass the preset temperature numerical value of this

temperature switch

33,33 of this temperature switches form open-circuit condition, so that the electric power of this driver 32 (such as the imaginary arrow line among the figure) can't transfer to this LED lamp 31 via this temperature switch 33, but transfer on this LED lamp 31 via this current-limiting resistance 34, so this electric power in the process of this current-limiting resistance 34, when the output current of this driver 32 does not reach 700mA, can draw high output voltage at 32V automatically; And this current-limiting resistance 34 is when using 110 ohm, this current limliting electricity group 34 can drop to 66mA with electric current, it is original 1/10 electric current, this moment, this LED lamp 31 still can be lighted but brightness is original 1/10, and this LED lamp 31 is under the condition of 66mA at electric current, and voltage is 24.74V, and consumed power is 1.64W, thereby these LED lamp 31 self-heating amounts are descended, to reach the effect of cooling; And this current-limiting resistance 34 is when using 220 ohm, electric current can be dropped to 33mA, original 1/20, this moment, this LED lamp 31 still can be lighted but brightness is original 1/20, and this LED lamp is under the condition of 33mA at electric current, and voltage is 24.3V, and consumed power is 0.85W, thereby the self-heating amount of this LED lamp 31 is more descended, reach whereby the effect of cooling; Be with, by these current-limiting resistance 34 designs, can make this LED lamp 31 in the situation that reduces emitting brightness and caloric value, to reach outside the cooling-down effect, keep simultaneously this LED lamp 31 and be still the state of lighting, to continue the providing user of service to throw light on, avoid lighting environment suddenly to present dark state fully, and cause user of service's inconvenience; Then, when these LED lamp 31 temperature are reduced in the preset temperature numerical value of this temperature switch 33, this temperature switch 33 will return back to closed circuit state (such as Fig. 4), the brightness that this LED lamp 31 is brought into normal play; Be with, when no matter this temperature switch 33 presented open circuit or closed circuit state, this LED lamp 31 can not extinguish, and avoids this LED lamp 31 to reduce its useful life in frequent switching process.

By above-mentioned explanation, the utility model has following listed advantage and effect really, and the bar row are as follows hereby:

1, by be connected in parallel the respectively mode of this driver and LED lamp of this temperature switch and current-limiting resistance, so that this temperature switch is when presenting open-circuit condition, this power supply will connect this LED lamp through this current-limiting resistance, make this LED lamp under the state of Dimming and caloric value, keep running, produce surge voltage to avoid repeatedly opening and closing this LED lamp in the existing LED lamp group, and reduce life-span of this LED lamp, and then make the longer service life of this LED lamp.

2, still continuous aforementioned, when this temperature switch forms open circuit, this LED lamp is still the state of lighting, and throws light on so that the user of service under this LED lamp lighting environment to be provided, and is unlikely to badly influence this user of service, certainly, because this LED lamp still presents the state of lighting, the user of service can know and know that this LED lamp is excess Temperature, and can not think this LED lamp group fault by mistake, and cause the user to take for fault and eliminate the situation of changing this LED lamp group.

Conclude aforementioned; the utlity model has the LED lamp group of overheat protector function; it organizes the mode of be connected in parallel respectively this driver and LED lamp by this temperature switch and current limliting electricity; make this LED light temperature surpass the preset temperature numerical value that this temperature switch sets and when disconnecting being connected of this LED lamp and driver; the electric power of this driver still can see through this current-limiting resistance and with this LED conducting; to provide curtage after the reduction to make this LED lamp state that under brightness reduces, maintainings lights; reduce gradually whereby the temperature of this LED lamp; to protect this LED lamp; impel outside this LED lamp life, cause the effect of user of service's inconvenience in the time of more can avoiding this LED lamp moment to extinguish.

The above person of thought, only be explanation preferred embodiment of the present utility model, when not limiting the scope that the utility model is implemented with this, the simple equivalence of namely generally doing according to the utility model claim and utility model description changes and modifies, and all should still belong in the scope that the utility model patent contains.

Claims

1. LED lamp group with overheat protector function, it includes at least one LED lamp, and one is electrically connected the driver of this LED lamp, and a temperature switch of being located between this LED lamp and driver; Wherein, this temperature switch has a preset temperature numerical value, but so that the temperature that this LED lamp of this temperature switch sensing produces, be open circuit so as to controlling this temperature switch, closed circuit state is switched, it is characterized in that: this temperature switch is parallel with a current-limiting resistance, when it made this temperature switch be open-circuit condition, the electric power that this driver is supplied still can and make this LED lamp be the conducting lighting lamp state by this current-limiting resistance.