应用于微弱能量收集系统的超低压自启动电路

An Ultra Low Voltage Self-Starting Circuit for Weak Energy Collection Systems

采用0.18μm 1.8V/3.3VCMOS工艺,设计了一种应用于微弱能量收集系统的超低压自启动电路。采用LC振荡电路产生2个高频高幅度的时钟信号,将4级交叉耦合电荷泵串联在一起作为升压主电路,避免了器件栅极氧化层不稳定以及器件导通、关断不彻底的问题。仿真结果表明,该低压自启动电路能够在约150μs的时间内将80mV的直流电压升压到579mV,转换效率达80%。相比其他低压启动电路,该低压自启动电路能在不借助外部辅助的条件下实现低压自启动,具有更快的启动速度和更高的效率。

A low voltage self-starting circuit for weak energy collection systems was developed in a 0.18μm 1.8 V/3.3 VCMOS process.The proposed circuit used LCoscillator to generate two clock signals of high frequency and high amplitude.A cross-coupled charge pump with four stages in series was used as the main boost circuit for avoiding the instability of the device gate-oxide and making the charge transfer switches turn on and off completely.Finally,the simulation results showed that the proposed low voltage self-starting circuit was capable of converting the DC voltage from 80 mV to 579 mV in 150μs.Its conversion efficiency was 80%.Compared with other low voltage start-up circuits,this circuit could achieve a lower voltage self-starting operation without the help of the external auxiliary conditions.In addition,it had a faster start-up speed and a higher efficiency.