Abstract: The DC-DC converter may be configured to perform DC-DC power conversion between a primary side and a secondary side. The DC-DC converter may include: a reactor; a switching element configured to switch between an on period for accumulating a first energy in the reactor from the primary side and an off period for releasing the first energy from the reactor to the secondary side, causing a switch voltage acting on the switching element to rise during the off period; a first capacitor; and a second capacitor. The second capacitor may be configured to: accumulate a charge provided from the primary side during the off period; and transfer the charge to the first capacitor during the on period. The first capacitor may be configured to suppress, using the charge transferred from the second capacitor, the rise of the switch voltage after the switching element is switched back to the off period.

Abstract: A DC-to-DC converter includes an input terminal connected to a DC power source. An output terminal is connected to a load. A reactor is disposed between the input terminal and the output terminal. A blocking diode is connected in series to the reactor. A switching element has one end connected between the reactor and the blocking diode. A boost chopper circuit boosts an input voltage to generate an output voltage. A first reactor is disposed between the input terminal and the one end. A first capacitor is disposed between the first reactor and the switching element and connected in series to the first reactor. A first diode includes an anode terminal and a cathode terminal. The anode terminal is connected to a connection portion of the first reactor and the first capacitor. The cathode terminal is connected to the output terminal.

Abstract: A DC-to-DC converter includes an input terminal connected to a DC power source. An output terminal is connected to a load. A reactor is disposed between the input terminal and the output terminal. A blocking diode is connected in series to the reactor. A switching element has one end connected between the reactor and the blocking diode. A boost chopper circuit boosts an input voltage to generate an output voltage. A first reactor is disposed between the input terminal and the one end. A first capacitor is disposed between the first reactor and the switching element and connected in series to the first reactor. A first diode includes an anode terminal and a cathode terminal. The anode terminal is connected to a connection portion of the first reactor and the first capacitor. The cathode terminal is connected to the output terminal.

Abstract: A grid interconnection apparatus includes a voltage conversion section including DC/DC converters to step up or down output voltages of DC power sources. The voltage conversion section combines DC power outputs from the DC/DC converters into combined DC power and output the DC power. A power conversion section converts the DC power output from the voltage conversion section into AC power, and outputs the AC power to a power grid. A current detector detects a current input into the power conversion section. A voltage detector detects a voltage input into the power conversion section. A controller controls the DC/DC converters to maximize the power outputs from the DC power sources based on the detected current and the detected voltage.

Abstract: A power conversion apparatus includes a power converter, a voltage detector, a current detector, a detection voltage adjustor, and a controller. The power converter is configured to convert power from a power source into alternating-current power and is configured to output the alternating-current power to a power system. The voltage detector is configured to detect a voltage of the power system. The current detector is configured to detect a direct-current component of a current between the power converter and the power system. The detection voltage adjustor is configured to add a bias corresponding to the direct-current component to the voltage detected by the voltage detector, so as to generate a voltage detection signal, and is configured to output the voltage detection signal. The controller is configured to control the power converter to output an alternating-current voltage corresponding to the voltage detection signal.

Abstract: A power conversion apparatus includes a power converter, a voltage detector, a current detector, a detection voltage adjustor, and a controller. The power converter is configured to convert power from a power source into alternating-current power and is configured to output the alternating-current power to a power system. The voltage detector is configured to detect a voltage of the power system. The current detector is configured to detect a direct-current component of a current between the power converter and the power system. The detection voltage adjustor is configured to add a bias corresponding to the direct-current component to the voltage detected by the voltage detector, so as to generate a voltage detection signal, and is configured to output the voltage detection signal. The controller is configured to control the power converter to output an alternating-current voltage corresponding to the voltage detection signal.