DC-voltage doubler reaches 96% power efficiency

摘要

The voltage-doubler circuit in Figure 1 can convert 2.5V dc to 5V dc or 1.8V to 3.3V. Most voltage doublers use an inductor, but this circuit doesn't need one. The circuit uses a capacitor, C, by charging it through serially connected switches. The charge switches let capacitor C charge, and the discharge switches are open. In the subsequent discharging phase, the charge switches are off, and the discharge switches close.