【MIT研究人员发明节能整流器:可节能50%以上】

MIT研究人员发明节能整流器:可节能50%以上】MIT微系统技术实验室的研究者们近日研究制作了一种新型的电力供应系统,可为电子传感器、无线设备等最终接入物联网的设备提供电力支持,其通过感应设备当前所需电压智能控制输输出电压与电量,同时也可以在设备需要时输出较以往更大电量。

MIT researchers built an energy-sipping power converter

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Researchers from MIT's Microsystems Technologies Laboratories have built a new power supply system designed specifically for powering electronic sensors, wireless radios and other small devices that will eventually connect the Internet of Things. While most power converters deliver a constant stream of voltage to a device, MIT's new scheme allows low-power devices to cut their resting power consumption by up to 50 percent.
The MIT system was announced at International Solid-State Circuits Conference earlier this month and maintains its efficiency at a very broad range of currents from 500 picoamps to 1 milliamp.
"Typically, converters have a quiescent power, which is the power that they consume even when they're not providing any current to the load," Arun Paidimarri, one of the postdocs who worked on the project said. "So, for example, if the quiescent power is a microamp, then even if the load pulls only a nanoamp, it's still going to consume a microamp of current. My converter is something that can maintain efficiency over a wide range of currents."
Rather than providing a continuous flow of power, the MIT step-down converter works with "packets" of energy. "You have these switches, and an inductor, and a capacitor in the power converter," Paidimarri said, "and you basically turn on and off these switches." The switches themselves have a circuit that release a packet of energy when the output voltage is below a specific level. If the device is using a low-power circuit -- say it's a sensor waking up to take a measurement -- then the device only releases a few packets of energy. If the device needs a high-power circuit -- to send a wireless signal, for example -- then it can release up to a million packets per second.
What's more, the resulting 50 percent drop in quiescent power means the researchers can start exploring other, lower-power energy sources like body-powered electronics.
https://www.engadget.com/2017/02/21/mit-researchers-built-an-energy-sipping-power-converter/

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