Abstract: A motor control apparatus includes: a booster circuit electrically connected to a battery; and an inverter electrically connected to the booster circuit at one end and electrically connected to a motor at another end. The motor control apparatus is provided with a controller configured to control the inverter to output square wave voltage to the motor, thereby driving the motor. The controller is configured to control the inverter to temporarily invert voltage polarity associated with the square wave voltage, on the basis of a phase difference between a voltage command associated with the motor and an electric current associated with the motor, on condition that an operating point of the motor is in a resonance region, which is an operation area in which resonance is generated in the booster circuit.

Abstract: Outputs from first and second DC power supplies are controlled based on a first reactor current and a second reactor current. For controlling an output from a corresponding DC power supply, a relative maximum point and a relative minimum point as two inflection points are provided in a high current of the first and second reactor currents in one control cycle, by controlling on and off of switching elements. In a low current of the first and second reactor currents, inflection points more than in the high current are provided. Each of the inflection points on a side of the high current is provided at timing identical to the inflection point on a side of the low current.

Abstract: A vehicle control apparatus is provided with: a modulator configured to generate modulation signals; a first corrector configured to perform a first correction process in which a center value of the modulation signals is corrected to reduce a loss in the inverter; a second corrector configured to perform a second correction process in which an amplitude shift and a phase shift of the third harmonic signal with respect to the voltage command signals are reduced; and a controller configured (i) to control the first corrector to perform the first correction process if the DC voltage is greater than or equal to first predetermined voltage and (ii) to control the second corrector to perform the second correction process if the DC voltage is less than the first predetermined voltage, when a number of revolutions of the AC motor is less than a predetermined number of revolutions.

Abstract: The present invention minimizes system loss during execution of intermittent boosting. A boost converter control apparatus has: a target value setting device for setting a target value of output voltage that minimizes a loss of a power supply system including a DC power supply, a boost converter, and a loading apparatus; an intermittent controlling device for executing an intermittent process of boost control in such a manner that the output voltage is maintained in a range including the set target value; an average value calculating device for calculating an average value of the output voltage in an execution period of the intermittent process; and a target value correcting device for correcting the set target value to reduce a deviation between the calculated average value and the set target value.

Abstract: Outputs from first and second DC power supplies are controlled based on a first reactor current and a second reactor current. For controlling an output from a corresponding DC power supply, a relative maximum point and a relative minimum point as two inflection points are provided in a high current of the first and second reactor currents in one control cycle, by controlling on and off of switching elements. In a low current of the first and second reactor currents, inflection points more than in the high current are provided. Each of the inflection points on a side of the high current is provided at timing identical to the inflection point on a side of the low current.

Abstract: A power system has a first control apparatus configured to generating a first command signal and a second command signal, to control the first converter on the basis of the first command signal, and to transmit the second command signal to a second control apparatus and the second control apparatus configured to control the second converter on the basis of the received second command signal. When it is requested that a state of each of the first and second converters is changed from a first state to a second state, the first control apparatus generates the first and second command signals so that the state of the second converter is changed to a third state in which both of the upper arm and the lower arm keep being in the OFF state, then the state of the first converter is changed from the first state to the second state, and then the state of the second converter is changed from the third state to the second state.

Abstract: A relative maximum point and a relative minimum point, are provided in a first reactor current and a second reactor current within one control cycle as a result of control of on and off of switching elements. At least one of the inflection points in the first and second reactor currents, a plurality of switching elements to simultaneously be turned on or and off are controlled to be turned on or off in a prescribed order with a time lag being set. At the inflection point with the time lag being set, a switching loss is produced in a switching element turned on later or a switching element turned on earlier in accordance with the prescribed order.

Abstract: An electric power conversion circuit comprises U-phase and V-phase switching circuits, a transformer, and an ?-phase switching circuit. A primary winding of a transformer is connected between the U-phase switching circuit and the V-phase switching circuit, and both ends of a secondary winding are connected to the ?-phase switching circuit. The ?-phase switching circuit comprises positive and negative terminals, a half bridge including and two switching devices, and a voltage divider circuit. The half bridge is provided between the positive terminal and the negative terminal, and a common connection point between the two switching devices is connected to one end of the secondary winding. A voltage divider output point of the voltage divider circuit is connected to the other end of the secondary winding.

Abstract: A power system has a first control apparatus configured to generating a first command signal and a second command signal, to control the first converter on the basis of the first command signal, and to transmit the second command signal to a second control apparatus and the second control apparatus configured to control the second converter on the basis of the received second command signal. When it is requested that a state of each of the first and second converters is changed from a first state to a second state, the first control apparatus generates the first and second command signals so that the state of the second converter is changed to a third state in which both of the upper arm and the lower arm keep being in the OFF state, then the state of the first converter is changed from the first state to the second state, and then the state of the second converter is changed from the third state to the second state.

Abstract: A controller for an electric motor system is provided. The electric motor system includes a DC power supply, a power converter, a smoothing capacitor, a three-phase AC motor, and a current sensor. The controller includes an electronic control unit. The electronic control unit is configured to control the power converter such that an inter-terminal voltage of the smoothing capacitor matches a first reference value. The first reference value is a value which is determined as the inter-terminal voltage of the smoothing capacitor when a phase current is equal to a second reference value. The electronic control unit is configured to correct a detection value of the current sensor so as to decrease a difference between the detection value and the second reference value when the inter-terminal voltage matches the first reference value and the detection value does not match the second reference value.

Abstract: The power converter includes a first operation mode in which each of switching elements is controlled on or off independently so as to perform a power conversion between a load and both a first DC power source and a second DC power source and a second operation mode in which every two of the switching elements are controlled on or off concurrently so as to perform the power conversion between the load and the first DC power source or the second DC power source. A switching speed at which when each of the switching elements is turned on or turned off is controlled in accordance with the operation mode. Specifically, the switching speed in the second operation mode is higher than the switching speed in the first operation mode.

Abstract: A power supply system includes first and second DC power supplies and a power converter. The power converter includes first and third semiconductor elements electrically connected between respective nodes of a first node and a second node and a power line, second and fourth semiconductor elements electrically connected between respective nodes of the first node and the second node and a second power line, a fifth semiconductor element electrically connected between the first and second nodes, and first and second reactors. The first reactor is electrically connected in series with the first DC power supply, between the first node and the second power line. The second reactor is electrically connected in series with the second DC power supply, between the second power line and the second node. A control device controls on and off of the switching element included in the semiconductor element.

Abstract: A vehicle control apparatus is provided with: a modulator configured to generate modulation signals; a first corrector configured to perform a first correction process in which a center value of the modulation signals is corrected to reduce a loss in the inverter; a second corrector configured to perform a second correction process in which an amplitude shift and a phase shift of the third harmonic signal with respect to the voltage command signals are reduced; and a controller configured (i) to control the first corrector to perform the first correction process if the DC voltage is greater than or equal to first predetermined voltage and (ii) to control the second corrector to perform the second correction process if the DC voltage is less than the first predetermined voltage, when a number of revolutions of the AC motor is less than a predetermined number of revolutions.

Abstract: A power supply system includes first and second DC power supplies and a power converter having first to fifth semiconductor elements and first and second reactors. The first and fourth semiconductor elements are electrically connected between a first node and a second node, and a first power line, respectively. Second and third switching elements are electrically connected between the first node and the second node, and a second power line, respectively. A fifth switching element is electrically connected between the first node and the second node. The first reactor is electrically connected in series with the first DC power supply, between the first node and the second power line. The second reactor is electrically connected in series with the second DC power supply, between the first power line and the second node.

Abstract: An electric source control apparatus has: a determining device for determining whether a converter operates in a first mode or a second mode, wherein the first mode prioritizes increase of efficiency of the electric power conversion than the second mode does and the second mode prioritizes suppression of increase of element temperature of the switching element than the first mode does; and a controlling device for controlling the converter so that (i) a switching pattern becomes a first pattern, if the converter operates in the first mode and (ii) the switching pattern becomes a second pattern, if the converter operates in the second mode, wherein the first pattern is capable of increasing the efficiency of the electric power conversion more than the second pattern is and the second pattern is capable of suppressing the increase of the element temperature more than the first pattern is.

Abstract: The present invention prevent a shortage of the output when an intermittent boost is executed. A control apparatus for controlling a boost converter that can boost power supply voltage by boost control has: an intermittent controlling device for executing the intermittent boosting in such a manner that output voltage is maintained in a voltage variation allowable range including a target value on the basis of the detected output voltage of the boost converter; an average value calculating device for calculating an average value of the output voltage in an execution period of the intermittent boosting; and a target value correcting device for correcting the set target value to increase it when the calculated average value is less than the target value and is less than a required voltage value of a loading apparatus.

Abstract: A power converter has a series direct connection mode of keeping on/off of a plurality of switching elements to maintain the state where first and second DC power supplies different in amount of voltage change with respect to input/output of the same amount of electric power are connected in series with an electric power line connected to a load, and a voltage controlling mode of controlling an output voltage on the electric power line to be a voltage command value by controlling on/off of the plurality of switching elements. In the voltage controlling mode, between time tx and ta, the sum of voltages of the first and second DC power supplies is matched with the voltage command value by controlling the output voltage by means of charging/discharging between the first and second DC power supplies. After time ta, the series direct connection mode is applied.

Abstract: A control apparatus for a vehicle including a three-phase AC motor and a power converter, the control apparatus includes an ECU. The ECU is configured to determine whether a rotation speed of the three-phase AC motor is equal to or less than a predetermined threshold and whether a stopping operation of the vehicle is performed, to determine that the vehicle stops when the rotation speed is equal to or less than the predetermined threshold and the stopping operation is performed, to determine whether the vehicle skids, and to switch a state of the power converter to a state where all on one side of the first and second switching elements are turned off and at least one on the other side of the first and second switching elements is turned on when the ECU determines that the vehicle stops and that the vehicle does not skid.

Abstract: A control system for a vehicle including a three-phase AC motor, a first switching device, a second switching device, and a power converter, is provided. The control system includes a short-circuit detector, and an ECU. The ECU is configured to: (a) control the power converter, when it is determined that the vehicle is stopped, so as to place, the power converter in a predetermined condition in which one of the first switching device and the second switching device for all of the three phases is in an OFF state, and (b) control the power converter when the short-circuit detector detects a short circuit in one of the first switching devices and the second switching devices, so that said one of the first and second switching devices in which the short circuit is detected provides the ON state in the predetermined condition.

Abstract: An operation mode selection unit selects an efficiency priority mode for minimizing the overall loss in a power supply system based on a load request voltage obtained in accordance with the condition of a load and on the conditions of DC power supplies, and generates a mode selection signal in accordance with the selection result. When SOC and/or output power have/has reached power supply restriction values in any DC power supply, an operation mode modification unit generates a final mode selection instructing signal so as to modify selection of the efficiency priority mode by the mode selection signal to select an operation mode in which power distribution between the DC power supplies can be controlled.