TWM448608U - LED lamp set with over-temperature protection function - Google Patents

Description

LED light group with over temperature protection

The invention relates to an LED lamp set design, in particular to an LED lamp set with over-temperature protection function.

According to the light emitting diode (LED), it is a small, high-efficiency solid-state light source. Since the light-emitting diode is a semiconductor component, its long service life and high stability are suitable for various light sources, such as Lighting, display screen light source, backlight source, traffic light, emergency exit indicator, etc.

Although the light emitted by the LED lamp contains less infrared rays, the light irradiation is slower than that of the white-wax bulb or the bulb-type fluorescent lamp, but since the LED lamp itself generates heat, once the heat accumulation exceeds the allowable temperature of the LED lamp When the LED lamp has permanent damage, it is necessary to find a way to cool the temperature of the LED lamp before the temperature of the LED lamp is too high to avoid the LED lamp temperature being too high and causing damage.

Referring to FIG. 1 , an LED lamp set 1 having an over temperature protection function includes an LED lamp 11 , a driver 12 electrically connected to the LED lamp 11 , and a temperature switch 13 disposed between the LED lamp 11 and the driver 12 . The temperature switch 13 has a preset temperature value, so that the temperature switch can sense the temperature generated by the LED lamp, thereby controlling the temperature switch to switch in an open circuit or a closed state, that is, the LED lamp 11 generates When the temperature exceeds the preset temperature value, the temperature switch 13 is disconnected and is in an open state, so that the current of the driver 12 cannot supply the LED. When the lamp 11 is turned off, the LED lamp 11 is turned off, thereby lowering the temperature of the LED lamp 11; otherwise, when the temperature of the LED lamp 11 is lowered to the preset temperature value of the temperature switch 13, the temperature switch 13 is restored. In the closed state, the current of the driver 12 is passed through the temperature switch 13 and sent to the LED lamp 11 to cause the LED lamp 11 to be illuminated, thus repeating.

However, it is known that the LED lamp set 1 is actually used, and it is easy to have the following defects, which are detailed as follows:

1. Since the temperature switch 13 changes with the temperature of the LED lamp 11, the LED light 11 is turned on or off in a timely manner to control the lighting or the light-off state of the LED lamp 11, so that when the LED lamp 11 is repeatedly turned on and off, it is turned on. The surge voltage generated at the time is likely to cause a decrease in the life of the LED lamp 11, and it is necessary to improve.

2. When the temperature switch 13 is in an open state and the LED lamp 11 is turned off, the LED lamp 11 for illumination purposes will cause the environment illuminated by the LED lamp 11 to be dark, resulting in a user. Quite inconvenient, and when the LED lamp 11 is extinguished due to excessive temperature, it is easy for the user to mistakenly think that the LED lamp group 1 is faulty, and then the LED lamp group 1 is replaced, which is easy to cause The undamaged LED light group 1 has been replaced and needs to be improved.

Therefore, the object of the present invention is to provide an LED lamp group with over-temperature protection function, which can maintain the illumination state of the LED lamp under the over-temperature condition, thereby effectively reducing the protection effect of the LED lamp temperature. In order to achieve a greatly improved service life, avoid improper replacement and easy to use and other effects.

Therefore, the LED lamp set with over-temperature protection function comprises at least one LED lamp, a driver electrically connected to the LED lamp, a temperature switch disposed between the LED lamp and the driver, and a parallel connection a current limiting resistor between the LED lamp and the driver; wherein when the temperature of the LED lamp exceeds a temperature value set by the temperature switch, and the temperature switch is in an open state, the power supplied by the driver can still pass the limit a current resistor to reduce the current and voltage and then to the LED lamp, so that the LED lamp maintains the conduction state, and the temperature of the LED lamp is lowered until the temperature is lowered to the temperature range of the temperature switch, and the power is again Directly passing through the temperature switch to be electrically connected to the LED lamp, so that the LED lamp returns to the original brightness, in addition to avoiding the inconvenience caused by the conventional LED lamp being extinguished by an instant, or accidentally discarding the extinguished LED lamp as a failure. In addition to causing improper replacement, it is also possible to avoid the surge voltage generated by the LED lamp due to overheating or turn-on, which leads to shortened service life of the LED lamp.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

Referring to FIG. 3, a preferred embodiment of the LED lamp set 3 with over-temperature protection function includes at least one LED lamp 31, a driver 32 electrically connected to the LED lamp 31, and a LED lamp A temperature switch 33 between the driver 32 and a current limiting resistor 34 in parallel with the temperature switch; wherein, in the embodiment, the LED lamp 31 can be a single design or a plurality of LED lamps 31 connected in series, This embodiment uses LED lights For example, in the embodiment, the driver 32 selects a fixed current of 700 mA and a maximum voltage of 32 V as an example.

Continuing the foregoing, the temperature switch 33 has a preset temperature value, and the conventional temperature switch 33 is often set at 70 ° C, that is, the temperature generated by the LED lamp 31 exceeds the preset temperature set by the temperature switch 33. When the value is changed, the temperature switch 33 is in an open state due to the influence of high heat, so that the electrical connection between the LED lamp 31 and the driver 32 is turned off; otherwise, when the temperature of the LED lamp 31 is lowered and returned to the temperature switch 33 When the preset temperature value is set, the temperature switch 33 forms a closed state, so that the LED lamp 31 and the driver 32 are electrically reconnected; further, the current limiting resistor 34 can be based on the LED lamp 31. The wattage is used for selection and installation, and the selection method of the embodiment is to limit the current input into the LED lamp 31 to within 50% of the original, so that the brightness and heat generation of the LED lamp 31 can be reduced. Therefore, in this embodiment, the current limiting resistor 34 is selected from 110 ohms and 220 ohms.

Referring to FIG. 4, in use, when the temperature of the LED lamp 31 is normal, the temperature switch 33 is in a closed state, so the power of the driver 32 (the imaginary arrow line in the figure) is directly transmitted to the temperature switch 33 via the temperature switch 33. The LED lamp 31 is used to normally illuminate the LED lamp 31, that is, the driver 32 directly pushes the LED lamp with a constant current mode of 700 mA (hereinafter referred to as CC700 mA), and the driver 32 is saturated with current to 700 mA, so that the voltage can be automatically stepped down to 27 V. Output, at this time, the power consumption of the LED lamp 31 is 18.9W.

Referring to FIG. 5, when the temperature of the LED lamp 31 exceeds the temperature switch 33 When the temperature value is preset, the temperature switch 33 forms an open state, so that the power of the driver 32 (the imaginary arrow line in the figure) cannot be transmitted to the LED lamp 31 via the temperature switch 33, but via the current limit. The resistor 34 is transmitted to the LED lamp 31. Therefore, when the power of the driver 32 passes through the current limiting resistor 34, the output current of the driver 32 is less than 700 mA, and the output voltage is automatically pulled at 32 V; and the current limiting resistor 34 is used. At 110 ohms, the current limiting group 34 will reduce the current to 66 mA, which is the original 1/10 current. At this time, the LED lamp 31 will still illuminate but the brightness is 1/10 of the original, and the LED lamp 31 is at the current. Under the condition of 66 mA, the voltage is 24.74V, and the power consumption is 1.64W, so that the heat of the LED lamp 31 itself is lowered to achieve the effect of cooling; and when the current limiting resistor 34 uses 220 ohms, the current is reduced to 33mA, is the original 1/20, at this time, the LED lamp 31 will still be lit but the brightness is 1/20 of the original, and the LED lamp has a voltage of 24.3V and a power consumption of 0.85W under the condition of a current of 33 mA. Therefore, the heat generated by the LED lamp 31 is further reduced, thereby achieving the effect of cooling; The current limiting resistor 34 is designed to enable the LED lamp 31 to achieve a cooling effect while reducing the brightness and heat generation, while maintaining the LED lamp 31 still in a state of illumination to continuously provide user illumination and avoid The lighting environment suddenly appears completely dark, causing inconvenience to the user; then, when the temperature of the LED lamp 31 is lowered to the preset temperature value of the temperature switch 33, the temperature switch 33 will return to the closed state (see FIG. 4). The LED lamp 31 is caused to have a normal brightness; therefore, the LED lamp 31 does not extinguish when the temperature switch 33 is in an open circuit or a closed circuit state, thereby preventing the LED lamp 31 from reducing its service life during frequent switching processes. .

From the above description, the present invention does have the advantages and effects listed below, as follows:

1. The temperature switch and the current limiting resistor are respectively connected in parallel to the driver and the LED lamp, so that when the temperature switch is in an open state, the power source will connect the LED lamp through the current limiting resistor, so that the LED lamp is lowered. The operation is maintained under the condition of brightness and heat generation, so as to avoid the surge voltage generated by repeatedly turning on and off the LED lamp, and reducing the life of the LED lamp, thereby making the life of the LED lamp longer.

2. Continuing the foregoing, when the temperature switch forms an open circuit, the LED light is still illuminated to provide illumination for the user in the LED lighting environment, without seriously affecting the user, of course, The LED lamp is still in a state of being lit, and the user can clearly know that the LED lamp is only overheated, and does not mistake the LED lamp group for failure, thereby causing the user to mistake the replacement of the LED lamp group. The situation.

In summary, the present invention has an over-temperature protection function LED lamp set, wherein the temperature of the LED lamp exceeds the preset of the temperature switch by the way that the temperature switch and the current limiting power group are respectively connected in parallel to the driver and the LED lamp. When the temperature value is set to disconnect the LED lamp from the driver, the power of the driver can still be electrically connected to the LED through the current limiting resistor to provide a reduced current or voltage to maintain the LED lamp at a reduced brightness. In the bright state, the temperature of the LED lamp is gradually lowered to protect the LED lamp, thereby prolonging the life of the LED lamp, and further avoiding the inconvenience of the user when the LED lamp is momentarily extinguished.

However, the above description is merely illustrative of the preferred embodiment of the present invention. When it is not possible to limit the scope of the present invention, that is, the simple equivalent changes and modifications made in accordance with the scope of the novel application and the contents of the new specification are still within the scope of the present patent.

3‧‧‧LED light group

31‧‧‧LED lights

32‧‧‧ drive

33‧‧‧temperature switch

34‧‧‧ Current limiting resistor

1 is a block diagram of a conventional LED lamp set; FIG. 2 is a block diagram of a conventional LED lamp set operation; FIG. 3 is a block diagram of a preferred embodiment of the present invention; and FIG. 4 and FIG. A block diagram of a preferred embodiment of the action description.

3‧‧‧LED light group

31‧‧‧LED lights

32‧‧‧ drive

33‧‧‧temperature switch

34‧‧‧ Current limiting resistor

Claims (1)

An LED lamp set with over-temperature protection function, comprising at least one LED lamp, a driver electrically connected to the LED lamp, and a temperature switch disposed between the LED lamp and the driver; wherein the temperature switch has a temperature switch Presetting a temperature value, so that the temperature switch can sense the temperature generated by the LED lamp, thereby controlling the temperature switch to switch in an open circuit and a closed circuit state, wherein the temperature switch is connected in parallel with a current limiting resistor, which makes the temperature When the switch is in an open state, the power supplied by the driver can still pass through the current limiting resistor and the LED lamp is turned on.