基于单端正激变换的远距离无线传感器网络电源自供电技术

Self powered technology of long distance wireless sensor network power supply based on single ended forward transform

针对远距离无线传感器网络内节点电源供能不稳定的问题,研究基于单端正激变换的远距离无线传感器网络电源自供电技术。根据Buck变换拓展产生具有稳压功能的单端正激变换器,基于功率管反向峰值电压上限值设计变换器内的功率变压器;根据电感系数和初级电感量确定变换器的钳位电容容量;利用脉冲宽度调制(PWM)芯片调制一系列脉冲宽度,等效获得电源供电所需波形。太阳能能源通过单端正激变换器进行稳压处理后,分别进入不同供电端,通过单片机对不同供电端电压情况进行检测,确定合适的供电端为电源供电。实验结果显示,该技术可在输出电压稳定的基础上,完成40 W功率输出;在负载条件一致的状态下,输出功率较为稳定。

Aiming at the problem of unstable power supply of nodes in long-distance wireless sensor networks,the self power supply technology of long-distance wireless sensor networks based on single ended forward conversion is studied. According to the expansion of Buck converter, a single ended forward converter with voltage stabilizing function is generated, and the power transformer in the converter is designed based on the upper limit of reverse peak voltage of power transistor;the clamping capacitance of the converter is determined according to the inductance coefficient and primary inductance;a series of pulse widths are modulated by PWM chip, and the waveform required for power supply is obtained equivalently. After the solar energy is stabilized by the single ended forward converter, it enters into different power supply terminals respectively.The voltage of different power supply terminals is detected by the single chip microcomputer to determine the appropriate power supply terminal for power supply. The experimental results show that the technology can achieve 40 W power output on the basis of stable output voltage, and the output power is relatively stable under the same load conditions.