基于超低电压充电泵的单片机供电电源设计

A Design for the Single-Chip Microcomputers Power Supply Based on the Ultra-Low-Voltage Charge Pump

针对以低功耗单片机为控制核心的间断工作系统,采用超低电压充电泵技术,结合升压型DC-DC变换器电路实现超低电源的升压和稳压。以太阳能电池板供电为例,利用S-822Z充电泵电路提供启动驱动信号,将电源供电电压扩展到0.3V,结合低压升压型S-8377控制器实现了在输出电流200mA、输出电压5V情况下,大于90%的大占空比升压、和稳压输出。给出了一个超低电压电源管理系统的设计方案,试验结果表明,该装置可利用超低电压输入实现稳定、可靠得稳压输出供电。

In order to provide power to the single-chip intermittent systems, an improved ultra-low power supply and boost regulators scheme based on ultra-low-voltage charge pump technology and step-up DC-DC converter circuits are presented. With the solar battery as an example, The drive signals are starting by S-822Z charge pump circuit, and 0.3V voltage power supply is extended. Combining with step-up S-8377 converter circuits used in big duty cycle outputing, its duty is more than 90% at 200mA output current and at 5V output voltage. An ultra-low voltage power management system design is given. The results of experiment indicate that the device has higher stability and reliability power supply by ultra-low-voltage.