Abstract: A control apparatus controls an optimizer that steps up a DC input voltage from a solar photovoltaic power generation panel to a predetermined DC high voltage and converts the stepped-up DC voltage into a grid connection voltage, and includes a microprocessor; a sensor group; and a MOS driver group. The microprocessor includes: a control logic unit; a maximum power point tracking control unit; a PWM control unit; a PFM control unit; an I/O port; a timer control unit; and an initial measurement unit. The sensor group includes a solar photovoltaic panel voltage detection circuit; a solar photovoltaic panel current detection circuit; an optimizer output voltage detection circuit; and an optimizer output current detection unit. Thus, even when the solar photovoltaic power generation panel is at a low power in a low output state, stable operation can be continued, and transistors can be protected from a surge voltage.

Abstract: A solar photovoltaic output optimizer circuit includes a PV input device for receiving output of a solar photovoltaic panel; a switching device for converting a DC voltage input through the PV input device into a predetermined pulse voltage or AC voltage; and a voltage doubler rectification device for stepping up power output of the switching device to a predetermined voltage. The PV input device includes: an inductance L1 connected in series to “+” output of the PV panel; and a surge protection circuit that is connected in parallel to the inductance L1, operates so as to absorb surge voltage to occur in output of the inductance L1 only when output of the PV panel is small and normal control cannot be performed, and is automatically separated from the inductance L1 when the output of the PV panel is large.