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首页> 外文期刊>International journal of circuit theory and applications >Analysis and implementation of a power management unit with a multiratio switched capacitor DC-DC converter for a supercapacitor power supply
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Analysis and implementation of a power management unit with a multiratio switched capacitor DC-DC converter for a supercapacitor power supply

机译：具有用于超级电容器电源的多比率开关电容器DC-DC转换器的电源管理单元的分析和实现

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摘要

An energy-harvesting system requires an energy-storing device to store the energy retrieved from the surrounding environment. Rechargeable batteries are commonly used to store this energy; however, because of the limited number of charge/discharge cycles, they need to be periodically replaced. A supercapacitor, which has, ideally, a limitless number of charge/discharge cycles, avoids this problem. In this case, it is required for the power management unit to produce a constant output voltage as the supercapacitor discharges. This paper presents a system with a multiratio switched capacitor DC-DC converter, in a 130-nm technology, with a maximum output power of 2mW, a maximum efficiency of 79.63% and a maximum output ripple, in the steady state, of 23mV for an input voltage range of 2.3-0.87V. The proposed converter has four operation states, to maximize its efficiency, that correspond to the conversion ratios of 1/2, 2/3, 1/1 and 3/2. Its clock frequency is automatically adjusted to produce a stable output voltage of 1V. These features are implemented through two distinct controller circuits that use two asynchronous time machines to dynamically adjust the clock frequency and to select the active state of the converter. All the theoretical expressions as well as the behaviour of the whole system were verified by using electrical simulations. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：能量收集系统需要一个能量存储设备来存储从周围环境中回收的能量。可充电电池通常用于存储这种能量。但是，由于充电/放电循环次数有限，因此需要定期更换。理想地具有无限次数的充电/放电循环的超级电容器可以避免此问题。在这种情况下，要求功率管理单元在超级电容器放电时产生恒定的输出电压。本文介绍了一种采用130nm技术的多比例开关电容器DC-DC转换器的系统，其最大输出功率为2mW，最大效率为79.63％，稳态下最大输出纹波为23mV。输入电压范围为2.3-0.87V。所提出的转换器具有四个工作状态，以使其效率最大化，它们对应于转换比1 / 2、2 / 3、1 / 1和3/2。它的时钟频率会自动调节以产生1V的稳定输出电压。这些功能通过两个截然不同的控制器电路来实现，该控制器电路使用两个异步时间机器来动态调整时钟频率并选择转换器的活动状态。通过电气仿真验证了所有理论表达式以及整个系统的行为。版权所有（c）2016 John Wiley＆Sons，Ltd.

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