Abstract: Provided is a technology in which a control device of a converter performs gate cutoff for cutting off power supply to a load when one of a battery detection value obtained by a battery voltage sensor or a low-voltage-side detection value obtained by a low-voltage-side voltage sensor or both thereof are abnormal values. After the control device performs the gate cutoff, the control device determines whether or not a main body circuitry is abnormal based on the battery detection value and the low-voltage-side detection value. When the control device determines that the main body circuitry is not abnormal, the control device determines whether one of the battery voltage sensor or the low-voltage-side voltage sensor is abnormal based on the battery detection value, the low-voltage-side detection value, and a high-voltage-side detection value obtained by a high-voltage-side voltage sensor.

Abstract: An output voltage of a plurality of chopper circuits is controlled by the average value of ON duties of their respective semiconductor switching elements so that there are provided a shunt controller which detects respective reactor currents of the plurality of chopper circuits and carries out shunt control based on the detected reactor currents and a voltage controller which carries out voltage control based on the detected output voltage, wherein a configuration is such that a control device controls the output voltage so that the reactor currents of the plurality of chopper circuits are equal to each other so as to prevent the average value of the ON duties of the semiconductor switching elements from changing due to the shunt control.

Abstract: A power conversion device including: a power conversion unit which is connected to two DC power supplies and performs power conversion; and a control unit which calculates a manipulated variable for controlling output voltage of the power conversion unit, wherein the manipulated variable for control is calculated on the basis of a voltage detection value on the primary side or the secondary side of the power conversion unit and a predetermined fixed value.

Abstract: A power conversion device including: a power conversion unit which is connected to two DC power supplies and performs power conversion; and a control unit which calculates a manipulated variable for controlling output voltage of the power conversion unit, wherein the manipulated variable for control is calculated on the basis of a voltage detection value on the primary side or the secondary side of the power conversion unit and a predetermined fixed value.

Abstract: An output voltage of a plurality of chopper circuits is controlled by the average value of ON duties of their respective semiconductor switching elements so that there are provided a shunt controller which detects respective reactor currents of the plurality of chopper circuits and carries out shunt control based on the detected reactor currents and a voltage controller which carries out voltage control based on the detected output voltage, wherein a configuration is such that a control device controls the output voltage so that the reactor currents of the plurality of chopper circuits are equal to each other so as to prevent the average value of the ON duties of the semiconductor switching elements from changing due to the shunt control.

Abstract: [Technical Problem] In a power conversion device for stepping up or stepping down the input voltage, when voltage converter become out of order, it is not possible to specify an IGBT element and a current sensor, which is in an extraordinary fault condition. [Solution to Problem] The power conversion device is configured to detect a voltage value of a smoothing condenser, connected in parallel to a load, where the load is to be connected to the power conversion device; detects, by a first current sensor, a current which flows through switching elements in a plurality of voltage converter; decides an abnormality of a switching element, by switching the switching element one by one; specifies the abnormality of the switching element; and specifies that the first current sensor is in an abnormal state, in a case where there is no abnormal state switching elements.

Abstract: [Technical Problem] In a power conversion device for stepping up or stepping down the input voltage, when voltage converter become out of order, it is not possible to specify an IGBT element and a current sensor, which is in an extraordinary fault condition. [Solution to Problem] The power conversion device is configured to detect a voltage value of a smoothing condenser, connected in parallel to a load, where the load is to be connected to the power conversion device; detects, by a first current sensor, a current which flows through switching elements in a plurality of voltage converter; decides an abnormality of a switching element, by switching the switching element one by one; specifies the abnormality of the switching element; and specifies that the first current sensor is in an abnormal state, in a case where there is no abnormal state switching elements.

Abstract: To provide a DC/DC converter which does not need to switch a change direction of a control value depending on a power transmission direction between low voltage side and high voltage side, and can control a voltage of a charge and discharge capacitor. A DC/DC converter which controls voltage of a charge and discharge capacitor by a controller that performs a ?duty control which changes an ON duty ratio difference of semiconductor circuits, and a phase shift control which changes a phase difference of an ON period of semiconductor circuits.

Abstract: To provide a DC/DC converter which does not need to switch a change direction of a control value depending on a power transmission direction between low voltage side and high voltage side, and can control a voltage of a charge and discharge capacitor. A DC/DC converter which controls voltage of a charge and discharge capacitor by a controller that performs a ?duty control which changes an ON duty ratio difference of semiconductor circuits, and a phase shift control which changes a phase difference of an ON period of semiconductor circuits.