Patent ID: 9614435
Date: 2017-04-04
CPC Classifications: H02M,H03K,Y02E

Claim:
1. A power optimization device for energy harvesting apparatus, comprising: a charge pump comprising an input terminal, an output terminal and a control terminal, and the charge pump configured to receive an input voltage of the energy harvesting apparatus by the input terminal, and output an output voltage according to an operating frequency by the output terminal; a voltage comparator electrically connected to the output terminal of the charge pump and configured to compare a voltage of the output terminal of the charge pump with a reference voltage, and output a first comparison signal when the voltage is equal to or higher than the reference voltage; an output switch electrically connected between the output terminal of the charge pump and an electricity storage unit, and switched between a turn-on status and a turn-off status according to the first comparison signal; a counter electrically connected to an output terminal of the voltage comparator, and configured to receive the first comparison signal and respectively record the times of the voltages of the output terminal of the charge pump equal to or higher than the reference voltage in voltage accumulation durations under different operating frequencies, so as to generate a plurality of counting results; and a frequency control module electrically connected between the counter and the control terminal of the charge pump, and configured to compare the counting results generated in the two adjacent voltage accumulation durations to generate a second comparison result, and adjust the operating frequency of the charge pump according to the second comparison result.