This paper presents a step-up micro-powerconverter for solar energy harvesting applications. The circuituses a SC voltage tripler architecture, controlled by an MPPTcircuit based on the Hill Climbing algorithm. This circuit wasdesigned in a 0.13 μm CMOS technology in order to workwith an a-Si PV cell. The circuit has a local power supplyvoltage, created using a scaled down SC voltage tripler,controlled by the same MPPT circuit, to make the circuitrobust to load and illumination variations. The SC circuits usea combination of PMOS and NMOS transistors to reduce theoccupied area. A charge re-use scheme is used to compensatethe large parasitic capacitors associated to the MOStransistors. The simulation results show that the circuit candeliver a power of 1266 μW to the load using 1712 μW ofpower from the PV cell, corresponding to an efficiency as highas 73.91%. The simulations also show that the circuit iscapable of starting up with only 19% of the maximumillumination level.
|Title of host publication||na|
|Publication status||Published - 1 Jan 2011|
|Event||International Symposium on Circuits and Systems (ISCAS), 2011 IEEE - |
Duration: 1 Jan 2011 → …
|Conference||International Symposium on Circuits and Systems (ISCAS), 2011 IEEE|
|Period||1/01/11 → …|