3BHE019719R0101 GVC736BE101在开发功率半导体之前，对于低功率应用，将DC电源的电压转换为更高电压的一种方法是使用振动器，然后逐级提升变压器，最后是一个整流器。^[1][2]在需要更高功率的地方电动发电机单位经常被使用，其中一个电动机驱动一个发电机产生所需的电压。(电动机和发电机可以是分开的装置，或者它们可以组合成一个没有外部动力轴的“发电机”单元。)这些相对低效和昂贵的设计仅在别无选择时使用，例如为汽车收音机供电(然后使用热离子阀(电子管),需要比6或12 V汽车电池高得多的电压)。^[1]功率半导体和集成电路的引入通过使用下述技术使其在经济上可行。例如，3BHE019719R0101 GVC736BE101首先是将DC的电源转换为高频交流电，作为变压器的输入——由于频率高，变压器体积小、重量轻、价格便宜——从而改变电压，再将电压整流回DC。^[3]虽然到1976年晶体管汽车收音机不需要高电压，一些业余无线电运营商继续使用移动振动器和发电机收发器需要高电压，尽管晶体管电源是可用的。^[4]

虽然有可能得到一个降低电压从较高的a线性调节器或者甚至是电阻器，这些方法将多余的热量作为热量耗散掉；只有使用固态开关模式电路，高能效转换才成为可能。

One of the early WSN piezo-based energy scavengers used the natural frequency of the process pipes themselves to cause what was effectively a “tuning fork” to oscillate and harvest the energy from the oscillation. The problem with this system was the process operated at different process conditions. That moved it outside the systems calibrated frequency range. No more oscillations meant no more energy.

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