Automatic temperature control LED pixel tube
A technology of automatic temperature control and LED lamps, which is applied in damage prevention measures of lighting devices, cooling/heating devices of lighting devices, lighting and heating equipment, etc., and can solve problems such as large calorific value, poor heat dissipation, and large heat dissipation burden of the system , to achieve the effect of convenient maintenance, convenient calibration, and good white balance effect
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Embodiment 1
[0033] refer to Figure 1-A , Figure 1-B , figure 2 , an automatic temperature control LED pixel tube, including a light-transmitting shell, a lamp body, an automatic temperature control circuit and a metal heat dissipation mask, at least one heat dissipation hole is arranged on the light-transmitting shell shell for convective heat dissipation, and the light body is provided with: a PCB board ; The LED light-emitting unit arranged on the PCB board includes at least one LED lamp; the chip is used to control the LED light-emitting unit to emit light. The chip can be arranged on the back side of the PCB board opposite to the LED lamp. Chip, this driver chip, comprises an external resistance input terminal (R EXT) and at least one drive output terminal, and described external resistance input terminal is used for setting the size of drive output terminal output current according to the size of resistance resistance value, and calculation formula is I OUT =V R_EXT / (R1+R2), th...
Embodiment 2
[0043] like figure 2 Shown is a circuit structure of the automatic temperature control pixel cylinder in application. The driver chip adopts a constant current driver chip with three drive output terminals OUT1, OUT2 and OUT3. The 13th pin of the chip is the input terminal R_EXT of an external resistor. The resistance value of the resistor connected to this pin adjusts the output current of its constant current output terminals OUT1, OUT2 and OUT3, the formula is I OUT =V R_EXT / (R1+R2), where V R_EXTR_EXT pin voltage, R1 is the resistance of the current limiting resistor, R2 is the resistance of the thermistor, the LED light-emitting unit consists of a red light-emitting diode R, a green light-emitting diode G, a blue light-emitting diode B and resistor R1, Composed of R2 and R3, the LED lights are connected in series with R1, R2, and R3 respectively; the power supply positive line VCC and the power supply negative line GND provide voltage to the circuit; the host control ...
Embodiment 3
[0045] On the basis of the above-mentioned embodiments, this embodiment preferably adopts a positive temperature coefficient (PTC, positive temperature coefficient) thermistor R2, such as image 3 As shown, it is the resistance-temperature curve of the positive temperature coefficient thermistor. Since the optimal operating temperature of the LED lamp and the LED driver chip is 50°C to 80°C (as shown by points A and C in the figure), it is higher than There is a risk of damage at 80°C. Therefore, the temperature must be controlled before the temperature rises to 80°C. Therefore, the Curie point is preferably 50°C to 80°C, and the best is 60°C (as shown by point B in the figure). Shown) PTC thermistor.
[0046] A type of positive temperature coefficient thermistor, the resistance value of the positive temperature coefficient thermistor shows a stepwise increase with the increase of the temperature of the PTC thermistor body. The higher the temperature, the greater the resistanc...
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Abstract
Description
Claims
Application Information
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