Patent ID: 9618963
Date: 2017-04-11
CPC Classifications: G06F

Claim:
1. A power management apparatus, comprising: a plurality of comparison units configured to compare voltages of storage devices respectively connected to output terminals of a plurality of harvesting power sources with a preset threshold voltage; a control unit configured to control an operation of the power management apparatus; and a plurality of switching units installed between the respective storage devices and a battery and configured to be turned on/off in response to switching control signals output from the control unit and to form power transmission paths between corresponding storage devices and the battery, wherein the control unit generates and provides the switching control signals based on output signals of the plurality of comparison units, wherein the control unit comprises: a frequency divider for dividing a frequency of an external clock by a certain number; a clock output unit for outputting a plurality of clocks having rising edges at different times based on the clocks output from the frequency divider; and a switching control signal generation circuit unit for generating and outputting switching control signals for the plurality of switching units based on the plurality of clocks output from the clock output unit and outputs of the plurality of comparison units, and wherein the switching control signal generation circuit unit comprises: D flip-flops of a first group for outputting signals generated in response to on the plurality of clocks output from the clock output unit and the external clock; logic gates for outputting resulting values obtained by performing a logic operation on output signals of the D flip-flops of the first group and output signals of the plurality of comparison units; and D flip-flops of a second group for receiving an output of the logic gate through asynchronous reset terminals thereof and outputting switching control signals for the plurality of switching units based on the output signals of the plurality of comparison units and the output signals of the D flip-flops of the first group.