Abstract: In response to the demand for efficiently boosting weak environmental energy to a usable voltage in energy harvesting systems, based on the structure of cross-coupled boost charge pumps, a high-efficiency, fast and stable boost charge pump circuit controlled by multi-phase clocks is proposed. Firstly, this circuit precisely controls the conduction timing of the charge transfer switch by adding auxiliary MOS transistors, auxiliary capacitors and using a six-phase non-overlapping clock, effectively suppressing the phenomenon of charge back flow and reducing energy loss. Then, by integrating dynamic body bias technology, conduction losses are reduced and sub-threshold leakage currents are suppressed, thereby further enhancing power conversion efficiency. Finally, the circuit is designed and verified through a simulation based on the 180 nm CMOS process. The simulation results show that under the input voltage of 0.6 V, the output voltage of the single-stage charge pump can reach 1.13 V, the maximum power conversion efficiency can reach 95.28%, the output ripple is as low as 40 mV, and the output voltage is stable within 1 μs.Therefore, it can be widely applied in low-power energy harvesting systems such as internet of things nodes.

Key words: charge pump, auxiliary MOS transistor, auxiliary capacitor, dynamic body bias, six-phase non-overlapping clock