Analysis of the ir LED chip applications

Ordinary infrared LED and the ir led strip is similar,
but infrared LED can emits infrared. Its pipe pressure drop is generally about 1.4v, the working current of less than 20mA.In order to adapt to different working voltage, the circuit is limited current with series resistor.The infrared transmitting to control the controlled device corresponding, and transmitting power is proportional to its distance control. In order to increase the control distance of infrared, infrared light emitting diode is working on the pulse condition（PWM）, because the pulse of light (light modulation) the effective transmission distance is almost directly proportional to the current of pulse,just try to improve the peak Ip, can increase the transmitting distance of infrared light. Improved Ip method, is to reduce the pulse duty ratio, namely the compressed pulse width(T), some color TV infrared remote control device, the work pulse duty ratio of infrared emitting tube is about 1/3-1/4; some electrical appliances infrared remote control, the duty ratio is 1/10. Reducing the pulse duty cycle can also make emission from low power infrared light-emitting diode is greatly increased.
Common infrared light emitting diode, the power is divided into small power (1mW-10mW), medium power (20mW-50mW) and high power (above 50mW-100mW)three categories. To make the infrared light emitting diode produces a modulated light, only in the drive pipe pulse voltage with a certain frequency.