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H-bridge paves new ways for LED lighting

机译:H桥为LED照明铺平了新道路

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摘要

The H-bridge is a classic circuit used for driving dc motors in a user-defined manner, such as in forward/ reverse direction or PWM-assisted controlled RPM with the help of four discrete/integrated switches or electromechanical relays. It is widely employed in robotics and power electronics. This Design Idea is a novel implementation of this technique for driving white-LED arrays directly from the ac mains in full-wave current-limited mode to realize an excellent flicker-free, energy-efficient solid-state lamp. The circuit controls and maintains the LED excitation current in both negative and positive half cycles of the excitation voltage to a constant level by way of electronic switches operating alternately during the positive and negative excursion of the excitation voltage. This approach facilitates current-controlled rectification of ac voltage into a dc voltage for energizing series-connected LEDs with clean dc current with negligible ripple and substantially enhances the power factor.
机译:H桥是一种经典电路,用于以用户定义的方式驱动直流电动机,例如在正向/反向或借助四个离散/集成开关或机电继电器的情况下,由PWM辅助控制的RPM。它被广泛应用于机器人和电力电子领域。该设计思想是该技术的一种新颖实现,用于以全波电流限制模式直接从交流电源驱动白光LED阵列,以实现出色的无闪烁,高效节能的固态灯。该电路通过在激励电压的正负偏移期间交替操作的电子开关,将激励电压的负半周期和正半周期中的LED激励电流控制和维持在恒定水平。这种方法有助于将交流电压的电流控制整流转换为直流电压,以干净的直流电流为串联连接的LED供电,且纹波可忽略不计,并大大提高了功率因数。

著录项

  • 来源
    《Electrical Design News》 |2013年第6期|5456-57|共3页
  • 作者

    Subodh Johri; Prateek Johri;

  • 作者单位

    Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani, Rajasthan, India;

    Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani, Rajasthan, India;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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