超低功率升压转换器促进能量收集
从安全到工业控制,无线传感器被部署在各种应用中,因为它们可以很容易地由电池供电。这是好消息。坏消息是,这些电池必须定期更换在外地,这是一个昂贵和笨拙的维护项目。因此,一个更实际和有效的无线电源解决方案是收获能源从环境能源,如光,热差,压电器件,传输射频信号,或任何其他来源,可以产生电力通过传感器。
不幸的是,这些能源产生的功率是非常低的,包括电压。更重要的是,他们是不稳定的(例如,在晚上没有阳光,没有太阳能)。因此,要充分利用它们需要超低功耗升压转换器,可以提供必要的升压转换所需的各种能源产生可用的功率,以及调节升压输出电压。
为了把这些能源转化为有用的电源,制造商,如线性技术和德克萨斯仪器,除其他外,已制作超低功耗升压DC / DC转换器,可以产生足够的电压和功率来驱动无线传感器和发射器阵列。
Energy-harvesting solutions
Linear Technology has released a wide range of ultra-low-power boost converter modules for harvesting energy from piezoelectric and photovoltaic sources to thermoelectric generators (TEGs)。 They include step-up DC/DC converters such as LTC3108/3109 and LTC3105. In addition, the supplier has also readied a complete energy-harvesting solution LTC3588-1, which is optimized for high-output impedance energy sources, such as piezoelectric transducers.
While LTC3108’s step-up topology operates from input voltages as low as 20 mV, LTC3105’s high-efficiency boost structure is tailored to operate from input voltages as low as 225 mV. As shown in Figure 1 below, the SSOP- or QFN-packaged LTC3108 provides a complete power management solution for wireless sensing and data acquisition using a small step-up transformer. The boost converter’s main output VOUTis programmed to deliver one of four regulated output voltages, using the voltage-select pins VS1 and VS2, to power a transmitter or sensor (Table 1)。
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