Abstract: A power converter includes a capacitor for smoothing a voltage entering therein, first and second switching units, a reactor, an isolated transformer, a second capacitor, and a controller for controlling the switching of the first and second switching units. The controller converts direct-current power to alternating-current power via the reactor and the isolated transformer and converts the alternating-current power to direct-current power via the second capacitor. The controller includes a phase-shift operation unit for taking at least any of first switching control signals as a reference signal and for calculating a phase shift that shifts the phase of the reference signal, as well as a logic operation unit for performing a logic operation that takes the signal resulting from shifting the phase of the reference signal by exactly the phase shift as input and for outputting a second switching control signal.

Abstract: This power converter device is provided with a capacitor for smoothing a voltage entering therein; a first switching unit; a second switching unit; a reactor; an isolated transformer; a second capacitor; and a controller for controlling the switching of the first switching unit and the second switching unit; and the controller converting direct-current power to alternating-current power via the reactor and the isolated transformer, and converting said alternating-current power to direct-current power via the second capacitor; wherein, the controller includes a phase-shift operation unit for taking at least any of first switching control signals as a reference signal, and calculating a phase shift that shifts the phase of the reference signal; and a logic operation unit for performing a logic operation that takes the signal resulting from shifting the phase of the reference signal by exactly the phase shift as input and outputting a second switching control signal.

Abstract: A power converter is provided with an inverter unit for converting DC power from a DC power supply into AC power, and a control unit that generates a control signal for controlling the inverter unit. The control unit includes an impedance estimation unit that injects a disturbance signal into a load and derives an estimated value of an impedance of the load based on a voltage signal from the load into which the disturbance signal is injected, the impedance compensator unit whose control parameters are set based on the estimated value of the impedance, and that corrects an output current signal in accordance with the control parameters, a command value unit that outputs a command value indicating a control target value, and a control compensator unit that generates a control signal, based on the command value from the command value unit and the current signal from the impedance compensator unit.

Abstract: A power converter is provided with an inverter unit for converting DC power from a DC power supply into AC power, and a control unit that generates a control signal for controlling the inverter unit. The control unit includes an impedance estimation unit that injects a disturbance signal into a load and derives an estimated value of an impedance of the load based on a voltage signal from the load into which the disturbance signal is injected, the impedance compensator unit whose control parameters are set based on the estimated value of the impedance, and that corrects an output current signal in accordance with the control parameters, a command value unit that outputs a command value indicating a control target value, and a control compensator unit that generates a control signal, based on the command value from the command value unit and the current signal from the impedance compensator unit.

Abstract: An inverter has a plurality of switching elements, the states of which are each switched by a pulse signal supplied in accordance with a power grid voltage. The inverter is provided with: a switching circuit that converts an input DC voltage to an AC voltage and outputs the AC voltage to a pair of output lines; a filter circuit having output coils inserted in the output lines; a current detection sensor that detects the current flowing through the output coils; and a high-speed pulse control circuit that, when an absolute value of the detected current is a threshold value or more, stops the supply of the pulse signal to the switching circuit.

Abstract: An inverter has a plurality of switching elements, the states of which are each switched by a pulse signal supplied in accordance with a power grid voltage. The inverter is provided with: a switching circuit that converts an input DC voltage to an AC voltage and outputs the AC voltage to a pair of output lines; a filter circuit having output coils inserted in the output lines; a current detection sensor that detects the current flowing through the output coils; and a high-speed pulse control circuit that, when an absolute value of the detected current is a threshold value or more, stops the supply of the pulse signal to the switching circuit.