Patent ID: 7645932

Claim:
A solar cell device, comprising: a solar cell section configured to output a first voltage upon receiving light; a charge pump circuit including a first charge pump and a second charge pump, the first charge pump including a first terminal and a second terminal, the first terminal being configured to receive the first voltage from the solar cell section and the second terminal being configured to output a second voltage that is higher than the first voltage, the second charge pump being configured to receive the second voltage from the second terminal of the first charge pump and output a voltage; an auxiliary component coupled to the first and second charge pumps to provide a first bias voltage to the first and second charge pumps, wherein the first bias voltage is higher than the second voltage; and an output section configured to receive an output voltage output by the charge pump circuit, wherein the charge pump circuit is configured to be powered by the solar cell section, the charge pump circuit being a low power integrated circuit.