![]() Inventor 李红化 陈育涛 Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Pending Application number CN201510208053.7A Other languages Chinese ( zh) Google Patents Common cathode LED (light emitting diode) driving circuitĭownload PDF Info Publication number CN104797055A CN104797055A CN201510208053.7A CN201510208053A CN104797055A CN 104797055 A CN104797055 A CN 104797055A CN 201510208053 A CN201510208053 A CN 201510208053A CN 104797055 A CN104797055 A CN 104797055A Authority CN China Prior art keywords led common cathode led drive chip drive circuit Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. ![]() Google Patents CN104797055A - Common cathode LED (light emitting diode) driving circuit 五,The supporting facilities of energy-saving technology of common cathode are not so perfectĪlthough the energy-saving technology of common cathode is good, but as its "age" is still young, the corresponding industrial chain and support has not been perfected, and it is still unable to mass production, so the cost competitiveness is low. Facing such situation, it is necessary to develop the layout of the whole industry and jointly promote it to accelerate the rapid maturity of the energy-saving products.CN104797055A - Common cathode LED (light emitting diode) driving circuit 四,In which aspects that common cathode led display can save money ?ġ Electricity& Operating costs: precision power supply reduces LED display power loss, saving operating costs.Ģ Equipment investment: low-heat caused can also save air conditioning, fans and other cooling equipment.ģ Maintenance and repair costs: the follow-up fully enclosed die-cast aluminum bottom shell, the components are maintained, so that its lifespan is about twice of the conventional led screens. Through the comparison of their power supply mode, it is known that the power consumption of common cathode LED display is much lower than that of common anode display caused, so that the heat caused is also lower than conventional common anode led screen. ![]() 三,Why the common cathode LED display cause less heat ? precision power supply Separately, less power loss, and the heat generated is much lower in the operation of LED display. ![]() 二.What is the difference between the common cathode / common anode LED display?ġ, The power supply direction is different: for the common anode LED display, the current flows from the PCB board to the led lights, and the RGB led light is uniformly powered, which increases the forward voltage drop of the circuit for the common cathode LED display,current passes through the led bead to the IC negative pole, positive The pressure is reduced and the conduction internal resistance is small.Ģ. The power supply voltage is different: the common anode LED display usually gives red, green and blue led beads a voltage higher than 3.8V (such as 5V unified power supply, the power loss is large for the common cathode LED display, it’s based on the actual voltage required by the chip of red, green and blue led beads (the voltage of red led bead is about 2.5V, about 3.8V for the voltage of blue and green led bead needed ).
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