Abstract: Provided is a drive device for a rotating electric machine, including: a power conversion unit configured to convert DC power supplied from a storage battery into AC power, and to supply the AC power to a rotating electric machine; and a control unit output a switching signal to the power conversion unit. The control unit is configured to set, when the storage battery is to be charged, in a case in which a temperature of the storage battery input from an outside is lower than a set temperature suitable for charging, the switching signal for the power conversion unit so as to be different from the switching signal in a normal drive state of the rotating electric machine.

Abstract: To provide a controller for power conversion circuit which can maintain the detection value of second voltage at the target value of second voltage without depending on feedback control, when the first voltage is varied. A controller for power conversion circuit changes a control value by feedback control so that the detection value of second voltage approaches a target value of second voltage; calculates a control value for control, by correcting the control value based on the detection value of first voltage so as to correct, in feedforward manner, a change of the control value due to a change of the first voltage if correction of the control value is not performed; and controls on/off the switching device based on the control value for control.

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: Provided is a drive device for a rotating electric machine, including: a power conversion unit configured to convert DC power supplied from a storage battery into AC power, and to supply the AC power to a rotating electric machine; and a control unit output a switching signal to the power conversion unit. The control unit is configured to set, when the storage battery is to be charged, in a case in which a temperature of the storage battery input from an outside is lower than a set temperature suitable for charging, the switching signal for the power conversion unit so as to be different from the switching signal in a normal drive state of the rotating electric machine.

Abstract: To provide a power converter which can maintain the stability and the response of the feedback control system, even if the frequency characteristic of the chopper circuit changes according to change of driving condition. A power converter is provided with a chopper circuit which has reactor and switching device; and a control circuit which changes a feedback value of duty ratio of the switching device so that a deviation between a target value of output voltage and a detection value of output voltage approaches to 0, wherein the control circuit changes a frequency characteristic of the feedback control, based on at least any two or more of information on the output voltage, information on an input voltage, and information on duty ratio.

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: To provide a power converter which can maintain the stability and the response of the feedback control system, even if the frequency characteristic of the chopper circuit changes according to change of driving condition. A power converter is provided with a chopper circuit which has reactor and switching device; and a control circuit which changes a feedback value of duty ratio of the switching device so that a deviation between a target value of output voltage and a detection value of output voltage approaches to 0, wherein the control circuit changes a frequency characteristic of the feedback control, based on at least any two or more of information on the output voltage, information on an input voltage, and information on duty ratio.

Abstract: A plurality of semiconductor elements have sources which are commonly connected, and drains which are commonly connected. A voltage measurement unit measures an ON voltage between the source of a first semiconductor element of the plurality of semiconductor elements and the drain of the first semiconductor element. A determination unit receives information indicating a magnitude of an ON current between the source of the first semiconductor element and the drain of the first semiconductor element, and a measured value of the ON voltage in the voltage measurement unit, and determines whether the plurality of semiconductor elements are in a normal state or in an overheated state based on the measured value of the ON voltage and the received information indicating the magnitude of the ON current.

Abstract: A plurality of semiconductor elements have sources which are commonly connected, and drains which are commonly connected. A voltage measurement unit measures an ON voltage between the source of a first semiconductor element of the plurality of semiconductor elements and the drain of the first semiconductor element. A determination unit receives information indicating a magnitude of an ON current between the source of the first semiconductor element and the drain of the first semiconductor element, and a measured value of the ON voltage in the voltage measurement unit, and determines whether the plurality of semiconductor elements are in a normal state or in an overheated state based on the measured value of the ON voltage and the received information indicating the magnitude of the ON current.

Abstract: An electric power converter including an electric-power conversion circuit that performs bidirectional conversion of a voltage between a DC power source and a motor and outputs the voltage, a first voltage detector that detects an inter-terminal voltage at the DC power source side of the electric-power conversion unit, a second voltage detector that detects an inter-terminal voltage at the motor side of the electric-power conversion unit, and a controller. The controller includes a first calculator that calculates a main duty, based on a target voltage and the inter-terminal voltage at the motor side, and a second calculator that calculates a sub-duty, based on the main duty, the inter-terminal voltage at the motor side, and the inter-terminal voltage, at the DC power source side, detected by the second voltage detection unit. The controller calculates a duty amount for operating the electric-power conversion unit, based on the main duty and the sub-duty.

Abstract: Provided is a DC/DC converter device capable of suppressing overshooting of an output voltage and fluctuation of an input voltage. The DC/DC converter device includes: a DC/DC converter including a power conversion unit and a reactor; and a control unit. The control unit includes a rate-of-change limiting value setting unit configured to set a rate-of-change limiting value for the output voltage target value, and is configured to limit the output voltage command value by using the rate-of-change limiting value, to thereby generate the output voltage target value. The rate-of-change limiting value setting unit is configured to obtain an index value for quantitatively evaluating an amount of fluctuation in the input voltage, to thereby change a setting of the rate-of-change limiting value in such a direction as to narrow a rate-of-change limiting range when the index value is within a predetermined specific range.

Abstract: In a DC-DC voltage conversion device, overheat of a diode element connected in anti-parallel with a semiconductor switching element is a problem, and in order to resolve this, a temperature of a semiconductor switching element of a main conversion circuit is detected, a temperature of a diode element connected in parallel with the semiconductor switching element is calculated using a correction calculation of the detected semiconductor switching element temperature value in accordance with a step-up ratio of the DC-DC voltage conversion device, and diode element overheat protection is carried out in accordance with the calculated temperature value.

Abstract: There is provided a DC power source apparatus that can prevent failures in components included in the DC power source apparatus and a load and that can prevent damage to or deterioration in the components. A control unit of the DC power source apparatus includes a function of limiting a duty value that is the ratio of an on-time to the switching period of a switching device, and makes an upper limit value for limiting the upper limit of the duty value variable during switching operation of the switching device.

Abstract: A DC/DC converter includes: duty command calculation units for calculating duty command values for first, second, third, and fourth switching elements on the basis of difference voltage between a high-voltage-side voltage command value and a high-voltage-side voltage detection value; and a phase shift duty command calculation unit for calculating a phase shift duty command value corresponding to a phase difference between gate signals for the first and fourth switching elements and gate signals for the second and third switching elements, on the basis of difference voltage between a voltage target value and a charge voltage detection value of a charge/discharge capacitor, wherein gate signals for driving the first, second, third, fourth switching elements are generated on the basis of the duty command values and the phase shift duty command value.

Abstract: An electric power converter including an electric-power conversion circuit that performs bidirectional conversion of a voltage between a DC power source and a motor and outputs the voltage, a first voltage detector that detects an inter-terminal voltage at the DC power source side of the electric-power conversion unit, a second voltage detector that detects an inter-terminal voltage at the motor side of the electric-power conversion unit, and a controller. The controller includes a first calculator that calculates a main duty, based on a target voltage and the inter-terminal voltage at the motor side, and a second calculator that calculates a sub-duty, based on the main duty, the inter-terminal voltage at the motor side, and the inter-terminal voltage, at the DC power source side, detected by the second voltage detection unit. The controller calculates a duty amount for operating the electric-power conversion unit, based on the main duty and the sub-duty.

Abstract: In this DC/DC converter, a first controller calculates a first operation value on the basis of a difference between output voltage Vout and a first calculated value calculated on the basis of a detection value of voltage of the charge/discharge capacitor. A second controller calculates a second operation value on the basis of a difference between a charge/discharge capacitor voltage target value Vcf* and charge/discharge capacitor voltage Vcf. In control blocks, addition and subtraction of the first and second operation values are performed, and the conduction rates for switching elements are controlled, to control the output voltage and a charge/discharge capacitor voltage, thereby preventing application of overvoltage to the switching elements.

Abstract: An object of this invention is to obtain a control apparatus and a control method for a DC/DC converter, with which a DC/DC converter can be controlled with superior stability and responsiveness while reducing the size of a storage medium. A calculation value is calculated in accordance with a specific control method using a differential voltage between a target output voltage and an output voltage, whereupon a control calculation value is calculated from the calculation value and an input voltage.

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.

Abstract: There is provided a DC power source apparatus that can prevent failures in components included in the DC power source apparatus and a load and that can prevent damage to or deterioration in the components. A control unit of the DC power source apparatus includes a function of limiting a duty value that is the ratio of an on-time to the switching period of a switching device, and makes an upper limit value for limiting the upper limit of the duty value variable during switching operation of the switching device.