How much driving current does the infrared emitter need?
Time：2019-12-23View：820
The shape of commonly used infrared emission tube and led
When transmitting infrared ray to control the corresponding controlled device, the control distance is proportional to the transmitting power.
In order to increase the infrared control distance, the infrared emission tube works in the pulse state, because the effective transmission distance of the pulse light (modulation light) is directly proportional to the peak current of the pulse. Only by increasing the peak IP as much as possible, the infrared emission distance can be increased.
How to improve IP
Reduce the duty cycle of the pulse, that is, the width t of the compressed pulse. For some color TV infrared remote controls, the duty cycle of the working pulse of the infrared LED is about 1 / 3-1 / 4; for some electrical products, the duty cycle of the infrared remote controls is about 1 / 10. Reducing the pulse duty cycle can also greatly increase the emission distance of the low power infrared emission tube.
Similar, emitting infrared light. The tube voltage drop is about 1.4V, and the working current is generally less than 20mA. In order to adapt to different working voltage, the finite current resistor is often connected in series in the loop.
When transmitting infrared ray to control the corresponding controlled device, the control distance is proportional to the transmitting power.
In order to increase the infrared control distance, the infrared emission tube works in the pulse state, because the effective transmission distance of the pulse light (modulation light) is directly proportional to the peak current of the pulse. Only by increasing the peak IP as much as possible, the infrared emission distance can be increased.
How to improve IP
Reduce the duty cycle of the pulse, that is, the width t of the compressed pulse. For some color TV infrared remote controls, the duty cycle of the working pulse of the infrared LED is about 1 / 3-1 / 4; for some electrical products, the duty cycle of the infrared remote controls is about 1 / 10. Reducing the pulse duty cycle can also greatly increase the emission distance of the low power infrared emitter.
Classification of common infrared emitters
According to its power, it can be divided into:
Small power (1mw-10mw)
Medium power (20mw-50mw)
High power (above 50mw-100mw)
