微功耗系统中微弱能源收集电路的设计

Design of weak energy harvesting circuit in micro power systems

微功耗系统以其超低功耗、长时间自持运行等特点广泛用于工业控制、数据采集等领域,但是在某些应用条件下其电源要经受住高低温交替、尺寸限制、超长时间自持运行等考验,这些都是常规电源技术很难达到的。介绍一种微弱能源收集电路,采用太阳能或其他微弱能源作为输入,超低压升压电路将输入电能升压后为超级电容充电,并设计微功耗电源管理电路对收集的电能进行管理,实现对微功耗系统电能的有效供给。该电路能高效地对微弱电能进行收集,实现对整个系统供电的良好管理,使得整个微功耗系统的维护周期及使用寿命大大延长,应用范围得以拓展,成本也大为降低。

Micro power systems are widely used in industrial control, data acquisition and other fields because of its low power consumption, long-run self-sustaining. However, in some applications like the high and low temperature alternating, size limit, super-long self-sustaining operation and other tests, it is very difficult to achieve in conventional power technology. A weak energy harvesting circuit was described using solar energy or other weak energy as input and the voltage was promoted to super-capacitor charge by the ultra low voltage boost circuit.A ultra-low power management circuit was designed, by which the power supply for micro power systems was managed. The circuit could efficiently harvest weak energy, and power the whole system to achieve good management. The maintenance cycle and lifetime of the micro power systems are greatly extended, its applications become wider, and the cost is also greatly reduced.