反激式无电解电容LED驱动器的研究
发布时间：2019-04-13 15:26
【摘要】：LED(LIGHTEMITTINGDIODE)发光二极管,作为新一代电光源,具有环保、安全、节能、和超过50000小时的长寿命等特点。然而,在实际应用中,LED电光源的寿命、稳定性和能量效率通常会被相适配的LED驱动器所限制。为了将交流电转换成像大多数直流电压源一样的低压直流电供应给LED负载,通常会采用大电解电容来缓冲变化的输入功率。可是,电解电容的寿命只有短短的几千小时,而且在高温条件下,寿命还会大大减少。这就导致了 LED发光二极管和LED驱动器的寿命不匹配,从而影响了 LED电光源的寿命。本课题研究的目的就是通过减少LED驱动器中所需的电容值,将电路中的电解电容用其他长寿命的电容来代替,从而延长AC/DC的LED驱动器的寿命。本文提出了两种方案来去除LED驱动器中的电解电容。第一种方案是在电路的输入端加入电容串并联结构的填谷电路,填谷电路不仅可以起到缓冲输入输出功率的作用,同时可以对桥式整流后的电压进行降压,减少器件受到电压应力,提高电路的稳定性,延长电路的寿命。第二种方案则是引入的新型的控制策略,将输出的脉冲电流的峰均比降低,再利用较小的电容和电感并联结构对输出的脉冲电流进行整流,从而实现去电解电容的目的。本文详细推导了两种方案中电路的各个关键节点的电压电流关系,相关的电容值,以及新结构和新的控制策略的输出的效率,输出功率等关键指标。基于上述的两种方案,分别设计和制作15W和18W的两台原型机,并进行了实验验证,样机在效率、功率因数和电路体积上都有很好的表现。
[Abstract]:LED (LIGHTEMITTINGDIODE) light emitting diode, as a new generation electric light source, has the characteristics of environmental protection, safety, energy saving, and long life over 50000 hours. However, in practical applications, the life, stability and energy efficiency of LED electric light source are usually limited by the appropriate LED driver. In order to convert AC current into low voltage DC supply to LED like most DC voltage sources, large electrolytic capacitors are usually used to buffer the variable input power. However, the life of electrolytic capacitors is only a few thousand hours, and the life of electrolytic capacitors will be greatly reduced under high temperature conditions. This leads to the mismatch between the life of the LED and the LED driver, which affects the life of the LED light source. The purpose of this study is to prolong the life of AC/DC LED driver by reducing the capacitance required in the LED driver and replacing the electrolytic capacitance with other long-lived capacitors. In this paper, two schemes are proposed to remove the electrolytic capacitance from the LED driver. The first scheme is to add a capacitive series-parallel circuit to the input of the circuit, which can not only buffer the input and output power, but also reduce the voltage after bridge rectifier. Reduce the voltage stress of the device, improve the stability of the circuit, prolong the life of the circuit. The second scheme is to introduce a new control strategy, which reduces the peak-to-average ratio of the output pulse current, and then rectifies the output pulse current by using the smaller capacitance and inductor parallel structure, so as to achieve the goal of de-electrolytic capacitance. In this paper, the voltage-current relationship of the key nodes in the two schemes, the relative capacitance values, the output efficiency and output power of the new structure and the new control strategy are derived in detail. Based on the above two schemes, two prototype machines (15W and 18W) are designed and fabricated, and the experimental results show that the prototype has a good performance in efficiency, power factor and circuit volume.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN312.8
本文编号：2457698
[Abstract]:LED (LIGHTEMITTINGDIODE) light emitting diode, as a new generation electric light source, has the characteristics of environmental protection, safety, energy saving, and long life over 50000 hours. However, in practical applications, the life, stability and energy efficiency of LED electric light source are usually limited by the appropriate LED driver. In order to convert AC current into low voltage DC supply to LED like most DC voltage sources, large electrolytic capacitors are usually used to buffer the variable input power. However, the life of electrolytic capacitors is only a few thousand hours, and the life of electrolytic capacitors will be greatly reduced under high temperature conditions. This leads to the mismatch between the life of the LED and the LED driver, which affects the life of the LED light source. The purpose of this study is to prolong the life of AC/DC LED driver by reducing the capacitance required in the LED driver and replacing the electrolytic capacitance with other long-lived capacitors. In this paper, two schemes are proposed to remove the electrolytic capacitance from the LED driver. The first scheme is to add a capacitive series-parallel circuit to the input of the circuit, which can not only buffer the input and output power, but also reduce the voltage after bridge rectifier. Reduce the voltage stress of the device, improve the stability of the circuit, prolong the life of the circuit. The second scheme is to introduce a new control strategy, which reduces the peak-to-average ratio of the output pulse current, and then rectifies the output pulse current by using the smaller capacitance and inductor parallel structure, so as to achieve the goal of de-electrolytic capacitance. In this paper, the voltage-current relationship of the key nodes in the two schemes, the relative capacitance values, the output efficiency and output power of the new structure and the new control strategy are derived in detail. Based on the above two schemes, two prototype machines (15W and 18W) are designed and fabricated, and the experimental results show that the prototype has a good performance in efficiency, power factor and circuit volume.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN312.8
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