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单一方案可满足多个市场的LED照明需求 

 由 James Lee 发布 - 2018-07-27

我们大多数人都希望努力有回报,而有些人也许希望不劳而获。这两种情况很少巧合发生,但LED照明可能就是巧合。LED以功耗低见称,这意味着从几乎任何其他形式的照明转向LED都将省钱,而无任何代价。它的‘附加’特点是,因为您用更少的能量来照亮您的家或办公室,也会对环境有所帮助。

对于消费者,LED提供了有益于环境和省钱的回报,如果您从另一个角度看,这就像不劳而获(不包括初始支出)。但真的这么简单吗?理论上应该是,但现实情况是您节省的可能会有所不同,这取决于您的LED将交流转换成直流有多高能效。这不是消费者通常会注意的,我们可以认为,市场还不成熟,不太关注于此。但实际上,这只是在给未来制造问题。

当然,立法规定,LED和任何其他形式的照明一样,必须遵守某些功率因数校正(PFC)规格。此外,总谐波失真(THD)正越来越重要。制造商需要开发满足地区强制要求的方案,但这些方案满足这些要求的程度将决定消费者可预期的节省的总功耗。为了使制造商在多个地区开展业务更加困难,这些规范在世界各地并不一致。在一个地区可以容许的可能在另一个地区是不兼容的,这意味着原始设备制造商(OEM)要么需要开发多个特定区域的方案,要么需要标准化一个符合多个规范的方案。

在没有一个“万能的”方案的情况下,OEM可能会选择提供针对每个地区优化的不同设计,或者干脆放弃某些市场。这两个选择都不是理想的,因为第一个选择会带来更复杂的构建和物料单(BOM),而第二个选择会关闭潜在的有价值的销售渠道。制造商真正需要的是提供一种方案来满足多个地区的要求,同时不对其核心市场构成相应的成本劣势。事实上,我们几乎可以说,他们希望努力就能有所获,同时不付出代价就有所获。

有许多应用于LED的电源拓扑,一些比另一些好。同时,这可能表明市场仍然相对不成熟,没有一个万能的方案。例如,对于需要适合现有灯泡内占位的方案,尺寸和散热至关重要。在这些相对较低功率的应用(低于100 W)中,单级转换器就足够了,首选的方案是初级端整流(PSR),因为它支持使用较小的绕线器件。我们的目标是使一个完整的方案,包括电源整流、转换、调节和LED,符合传统灯泡般大小的尺寸。这意味着更换的LED可以直接插入现有的照明灯具,无需任何进一步的修改,给消费者尽可能最好的用户体验。

真正的挑战来自选择适合的转换器,提供高能效和符合多个地区要求的PFC和THD。大多数针对100 W以下应用领域的转换器使用非连续导通模式(DCM),这种模式可提供良好的THD,但通常以相对较大的变压器为代价。NCL3038x系列单级PSR反激式降压/升压转换器,使用临界导通模式(CrM),正在改变OEM对于LED驱动器设计的方式。

事实上,该转换器结合三种模式:负载超过80%时使用CrM,负载低于80%时使用谷底模式,负载极低时(如待机模式)使用频率返走。这使得PFC超过0.95,THD小于10%,使得一种设计适用于多个市场。

我们很难不付出代价就有所获,但只要选择合适的LED控制器,就有可能用单一方案来满足不同市场的需求,也可称之为不付出代价就有所获。

请下载NCL30386和NCL30388应用注释以了解更多设计诀窍。

 

标签:LED Lighting, LED Driver

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