用于低能量密度换能器的电源管理电路

发布时间：2018-10-08 14:51

【摘要】：为无线微传感器供能的低能量密度压电换能器,其采集能量少、输出功率低。使用传统的电源管理电路向储能电容充电时,低功率地能量传输使得采集能量大多耗散在整流电路中,而最终能够传递给储能电容的较少,导致电路充电功率低下。为解决低能量密度条件下,电源管理电路整流耗能大、充电功率低的问题,引入了高品质因数的石英晶体,提出一种新式电源管理电路。电路使用石英晶体低损耗地聚集换能器采集到的能量,当能量聚集到一定水平后,快速释放能量,为整流电路提供较高的输入功率,降低耗散在整流电路中的能量的比例,从而使更多的能量传递给储能电容,使其获得较高的充电功率。实验表明,对于50 Hz频率下输出8 V的压电换能器,相比于传统变频匹配电源管理电路,所提电路可将充电电压提高163%,充电功率提高110%。
[Abstract]:The low energy density piezoelectric transducer for wireless micro sensor has less energy acquisition and low output power. When the traditional power management circuit is used to charge the energy storage capacitor, the low power ground energy transmission causes the energy collection to dissipate mostly in the rectifier circuit, but it can be transferred to the energy storage capacitance in the end, which leads to the low charging power of the circuit. In order to solve the problem of high energy consumption and low charge power in the power management circuit under low energy density, a new type of power management circuit with high quality factor quartz crystal is introduced. The circuit uses quartz crystal to gather the energy collected by the transducer at low loss. When the energy is gathered to a certain level, the energy is released quickly, which provides a higher input power for the rectifier circuit and reduces the proportion of the energy dissipated in the rectifier circuit. So that more energy is transferred to the energy storage capacitor, so that it can get higher charging power. The experimental results show that the proposed circuit can increase the charging voltage and charge power by 163and 110. compared with the traditional frequency conversion matching power supply management circuit for the piezoelectric transducer with output 8 V at 50 Hz frequency.
【作者单位】：上海交通大学电子信息与电气工程学院;重庆大学光电工程学院;
【基金】：国家自然科学基金(61531008,61374217)项目资助
【分类号】：TM619

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