Patent ID: 8531855
Filing Date: 2013-09-10
Classification: G05F,H02J,H02M,Y02E

Abstract:
1. A power conversion apparatus comprising: a first input terminal connected to a positive electrode of a direct-current power source; a second input terminal connected to a negative electrode of the direct-current power source; a first output terminal electrically connected to the first input terminal; a second output terminal electrically connected to the second input terminal; a coil connected between the first input terminal and the first output terminal in series; a diode connected in a forward direction from an output end of the coil to the first output terminal; a switch configured to change over connection between the second input terminal and the output end of the coil; a capacitor connected between the first output terminal and the second output terminal; a controller configured to output a signal for controlling ON and OFF of the switch; and a DC-AC inverter unit which converts direct-current power output from each of the first output terminal and the second output terminal into alternating-current power and outputs the alternating-current power, wherein the controller comprises: an MPPT control unit configured to follow a maximum power point with a period based on a zero-cross detection signal of a system voltage based on an input signal acquired by subtracting a value obtained by multiplying a droop gain simulating drooping characteristics; a control unit configured to output a voltage direction value in such a manner that a difference between a reference output from the MPPT control unit and the input signal becomes zero; and a PWM comparator configured to output a PWM signal based on the voltage direction value and a triangular wave voltage.