led照明的協(xié)同電路保護

　　LED熱管理對于正確的色彩再現(xiàn)和安全操作至關(guān)重要。雖然設(shè)計者非常重視電源管理來控制過熱，但不要忽視過電壓和過電流保護。

　　隨著政府機構(gòu)、行業(yè)和消費者尋找降低能源成本的途徑，照明技術(shù)已成為人們關(guān)注的主要領(lǐng)域。近年來，發(fā)光二極管（LED）技術(shù)在價格、性能和可制造性方面取得了令人矚目的成就，而優(yōu)化LED操作的進一步改進有望推動照明市場的指數(shù)增長。

　　然而，盡管這項技術(shù)越來越受歡迎，但LED制造商仍在繼續(xù)努力：如果沒有足夠的熱量管理，熱量會降低LED的壽命，影響彩色輸出。此外，由于LED驅(qū)動器是硅器件，它們可能會短時間失效。這意味著可能需要故障保護，后備過電流保護。

　　LED technology has advanced rapidly， with improved chip designs and materials facilitating the development of brighter and longer-lasting light sources that can be used in a wide spectrum of applications. Nevertheless， LED luminaires require precise power and heat-management systems， since most of the electrical energy supplied to an LED is converted to heat rather than light.

　　Resettable polymeric positive temperature coefficient （PPTC） devices have demonstrated their effectiveness in a variety of LED lighting applications. Like traditional fuses， they limit current after specified limits are exceeded. However， unlike fuses， PPTC devices have the ability to reset after the fault is cleared and the power is cycled.

　　A variety of overvoltage protection devices including metal oxide varistors （MOVs）， electrostatic discharge （ESD） surge protection devices， and polymer-enhanced Zener diodes can be used in a coordinated scheme with PPTC devices to help improve LED performance and reliability.