LED lighting limit parameters
(1) Permissible Power Consumption Pm: The Maximum Value Of The Product Of The Positive Dc Voltage Applied Across The Led And The Current Flowing Through It. Above This Value, The Led Is Hot And Damaged.
(2) Maximum Forward Dc Current Ifm: The Maximum Positive Dc Current Allowed To Be Applied. Exceeding This Value Can Damage The Diode.
(3) Maximum Reverse Voltage Vrm: The Maximum Reverse Voltage Allowed. Above This Value, The Led May Be Damaged By Breakdown.
(4) Working Environment Topm: The Ambient Temperature Range Where The Light Emitting Diodes Can Work Normally. Below Or Above This Temperature Range, The Led Will Not Work Properly And The Efficiency Will Be Greatly Reduced.
Without Changing The Material, In The Limit Range Of The Led, The Means To Increase The Brightness Is To Increase The Current. As The Current Increases, The Led Heat Will Increase Dramatically. Used Led Light Source Portable Projector, Or Micro-cast Friends, Must Have A Profound Experience, Led Light Source Projector, Very Hot, And Generally There Will Be Obvious Noise. In These Products, The Small Size Of The Fuselage Is The One Hand, And The Key Is The Large Amount Of Heat Generated By Itself.
With The Increase Of Power, Led Heat Dissipation Becomes More And More Prominent. A Large Number Of Practical Applications Show That The Basic Reason Why Leds Cannot Increase The Input Power Is Due To The Fact That Led Will Emit A Lot Of Heat During The Work Process And Make The Die Temperature Quickly. As The Temperature Rises, The Thermal Resistance Increases. The Higher The Input Power, The Greater The Heating Effect. Increase In Temperature Will Lead To Device Performance Changes And Attenuation, Non-radiative Compounding Increase, Device Leakage Current Increase, Semiconductor Material Defects Growth, Metal Electrode Electromigration, Epoxy Resin Encapsulation, Etc., Seriously Affect The Led Optoelectronic Parameters. Even Disable The Power Led. Therefore, For Led Devices, It Is Increasingly Important To Reduce The Thermal Resistance And Junction Temperature, And To Study The Thermal Characteristics Of Light-emitting Diodes.
