Abstract: In an automotive vehicle inverter control apparatus of the related art, a limp-home mode is provided, but six power sources including transformers are required for respective gate circuits of the respective IGBT drive circuits. Therefore, a reduction in size and a reduction in weight cannot be achieved, and a demand of the improvement of mountability or the improvement of fuel consumption as described above cannot be satisfied. A power semiconductor module and the drive circuit include three unit semiconductor modules and three unit drive circuits corresponding to a three-phase alternating current, and power supply units of the unit drive circuits are provided independently, whereby the limp-home mode is provided and in addition, the number of power supply units may be reduced, so that the reduction in size and the reduction in weight are achieved.

Abstract: Provided is a driver board capable of miniaturizing itself while ensuring insulation voltage resistance performance. In the driver board: a transformer 114 is configured, so as to cross a first insulating region 120a, such that a primary side terminal 114a is connected to a primary side circuit 112a and a secondary side terminal 114b is connected to a secondary side circuit 113a; a power supply control IC 115 is configured, so as to cross a insulating region 120b, such that a primary side terminal 115a is connected to a primary side circuit 112b and a secondary side terminal 115b is connected to a secondary side circuit 113b; and the insulating region 120a and the insulating region 120b are formed so as to at least partially face each other via an insulating board 111 such that the primary side circuit 112a and the secondary side circuit 113b do not face each other via the insulating board and the primary side circuit 112b and the secondary side circuit 113a do not face each other via the insulating board.

Abstract: Provided is a driver board capable of miniaturizing itself while ensuring insulation voltage resistance performance. In the driver board: a transformer 114 is configured, so as to cross a first insulating region 120a, such that a primary side terminal 114a is connected to a primary side circuit 112a and a secondary side terminal 114b is connected to a secondary side circuit 113a; a power supply control IC 115 is configured, so as to cross a insulating region 120b, such that a primary side terminal 115a is connected to a primary side circuit 112b and a secondary side terminal 115b is connected to a secondary side circuit 113b; and the insulating region 120a and the insulating region 120b are formed so as to at least partially face each other via an insulating board 111 such that the primary side circuit 112a and the secondary side circuit 113b do not face each other via the insulating board and the primary side circuit 112b and the secondary side circuit 113a do not face each other via the insulating board.

Abstract: A power converter includes an inverter, a contactor for connecting a battery to the inverter in order to supply DC power from the battery to the inverter and for disconnecting the battery from the inverter in order to stop an operation to supply the DC power from the battery to the inverter, a smoothing capacitor connected in parallel to the battery through the contactor, a discharge circuit that is provided with a discharge resistor and a switching device connected in series to the discharge resistor and is connected in parallel to the smoothing capacitor to discharge electric charge from the smoothing capacitor, a voltage measurement circuit, a voltage-dividing circuit for dividing the voltage across the terminals of the smoothing capacitor to generate a partial voltage to be input to the voltage measurement circuit and a control circuit of the switching device.

Abstract: An electric power converter is provided with a plurality of power-conversion elements; a first control circuit that outputs a first control signal; an electricity storage circuit; a second control circuit that outputs a second control signal when the direct-current power source that supplies electrical power to the first control circuit is not normal; and a drive circuit that outputs drive signals for driving the plurality of power-conversion elements. Each of the power-conversion elements is either a power-conversion element of the upper arm connected to the high-voltage side or a conversion element of the lower arm connected to the low-voltage side. In cases when the voltage of the electricity storage circuit is at a higher predetermined first voltage value, the second control circuit outputs a second control signal so that all the power-conversion elements of the upper arm or the lower arm are turned on and the others are turned off.

Abstract: In an automotive vehicle inverter control apparatus of the related art, a limp-home mode is provided, but six power sources including transformers are required for respective gate circuits of the respective IGBT drive circuits. Therefore, a reduction in size and a reduction in weight cannot be achieved, and a demand of the improvement of mountability or the improvement of fuel consumption as described above cannot be satisfied. A power semiconductor module and the drive circuit include three unit semiconductor modules and three unit drive circuits corresponding to a three-phase alternating current, and power supply units of the unit drive circuits are provided independently, whereby the limp-home mode is provided and in addition, the number of power supply units may be reduced, so that the reduction in size and the reduction in weight are achieved.

Abstract: A power conversion system according to the present invention includes: an inverter circuit unit that converts a direct current power supplied from a direct current source into an alternating current power, the direct current power being supplied to the inverter circuit through a contactor that conducts and interrupts the direct current; a capacitor that smoothes the direct current power; a discharge circuit unit that is connected to the capacitor in parallel, and that includes a discharge resistor for discharging a charge stored in the capacitor and a switching element for the discharge resistor, being connected in series to the discharge resistor; a voltage detection circuit unit that detects voltage between both terminals of the capacitor; a first discharge control circuit that includes a first microcomputer, and that outputs a control signal to control switching of the switching element for discharging; and a second discharge control circuit that outputs an interruption signal to interrupt the switching el

Abstract: A power converter includes an inverter, a contactor for connecting a battery to the inverter in order to supply DC power from the battery to the inverter and for disconnecting the battery from the inverter in order to stop an operation to supply the DC power from the battery to the inverter, a smoothing capacitor connected in parallel to the battery through the contactor, a discharge circuit that is provided with a discharge resistor and a switching device connected in series to the discharge resistor and is connected in parallel to the smoothing capacitor to discharge electric charge from the smoothing capacitor, a voltage measurement circuit, a voltage-dividing circuit for dividing the voltage across the terminals of the smoothing capacitor to generate a partial voltage to be input to the voltage measurement circuit and a control circuit of the switching device.

Abstract: A discharge circuit for a DC power supply smoothing capacitor that is used in a power conversion device that supplies DC power via a switch to the DC power supply smoothing capacitor and an inverter, includes; a resistor that discharges charge in the capacitor; a switch connected in series with the resistor, that either passes or intercepts discharge current flowing from the capacitor to the resistor; a measurement circuit that measures a terminal voltage of the capacitor; and a control circuit that controls continuity and discontinuity of the switch; wherein the control circuit, after having made the switch continuous and starting discharge of the capacitor by the resistor, if a terminal voltage of the capacitor as measured by the measurement circuit exceeds a voltage decrease characteristic set in advance, makes the switch discontinuous and stops discharge by the resistor.

Abstract: An electric power converter is provided with a plurality of power-conversion elements; a first control circuit that outputs a first control signal; an electricity storage circuit; a second control circuit that outputs a second control signal when the direct-current power source that supplies electrical power to the first control circuit is not normal; and a drive circuit that outputs drive signals for driving the plurality of power-conversion elements. Each of the power-conversion elements is either a power-conversion element of the upper arm connected to the high-voltage side or a conversion element of the lower arm connected to the low-voltage side. In cases when the voltage of the electricity storage circuit is at a higher predetermined first voltage value, the second control circuit outputs a second control signal so that all the power-conversion elements of the upper arm or the lower arm are turned on and the others are turned off.

Abstract: A power conversion device includes an inverter circuit converting DC power into AC power and including switching devices constituting upper and lower arms, a control circuit controlling the switching devices, a drive circuit driving the switching devices by a signal from the control circuit, and an insulated power supply circuit supplying power to the drive circuit. The control circuit controls a power supply voltage to be outputted from the power supply circuit to the drive circuit. The drive circuit drives the switching devices and based on a carrier frequency and the power supply voltage. The power supply circuit includes a feedback output circuit through which the voltage outputted to the drive circuit is outputted to a power supply control IC. The feedback output circuit includes a dummy load circuit which controls the voltage to be outputted to the power supply control IC based on a change of the carrier frequency.

Abstract: A discharge circuit for a DC power supply smoothing capacitor that is used in a power conversion device that supplies DC power via a switch to the DC power supply smoothing capacitor and an inverter, includes; a resistor that discharges charge in the capacitor; a switch connected in series with the resistor, that either passes or intercepts discharge current flowing from the capacitor to the resistor; a measurement circuit that measures a terminal voltage of the capacitor; and a control circuit that controls continuity and discontinuity of the switch; wherein the control circuit, after having made the switch continuous and starting discharge of the capacitor by the resistor, if a terminal voltage of the capacitor as measured by the measurement circuit exceeds a voltage decrease characteristic set in advance, makes the switch discontinuous and stops discharge by the resistor.

Abstract: A power conversion device (140) includes an inverter circuit (12) that includes a bridge-connected power semiconductor element and is connected to a DC power supply through an openable and closable contactor (15), a driver circuit (21) to drive the power semiconductor element, a driver circuit control part (18) that performs PWM (Pulse Width Modulation) control on the driver circuit and causes the power semiconductor element to perform a switching operation, a voltage smoothing capacitor (500) connected in parallel to an input side of the inverter circuit, a driver power supply circuit (27) that is connected in parallel to the voltage smoothing capacitor, is inputted with a voltage applied to the voltage smoothing capacitor and supplies electric power to the driver circuit, a discharge circuit that includes a resistor (25) for discharging an electric charge of the voltage smoothing capacitor and a discharging switching element (26) connected in series to the resistor, and is connected in parallel to the volta

Abstract: Connection portions (225UP through 225WP) to which upper arm control terminals (320UU through 320UW) are connected are disposed at a first edge portion of a drive circuit board (22). And connection portions (225UN through 225WN to which lower arm control terminals (320LU through 320LW) are connected are disposed at a second edge portion of the drive circuit board (22). Upper arm implementation regions (227UP through 227WP), lower arm implementation regions (227UN through 227WN), and a low voltage pattern region (228) in which photo-couplers (221U through 221W) are implemented are formed in the board region between these board edge portions. And signal wiring (40U) that transmits a control signal from a photo-coupler (221U) to an implementation region (227UN) is formed in a conductor layer that is a lower layer than the conductor layer in the lower arm implementation region in which the lower arm driver circuit is implemented.

Abstract: A power conversion device includes an inverter circuit converting DC power into AC power and including switching devices constituting upper and lower arms, a control circuit controlling the switching devices, a drive circuit driving the switching devices by a signal from the control circuit, and an insulated power supply circuit supplying power to the drive circuit. The control circuit controls a power supply voltage to be outputted from the power supply circuit to the drive circuit. The drive circuit drives the switching devices and based on a carrier frequency and the power supply voltage. The power supply circuit includes a feedback output circuit through which the voltage outputted to the drive circuit is outputted to a power supply control IC. The feedback output circuit includes a dummy load circuit which controls the voltage to be outputted to the power supply control IC based on a change of the carrier frequency.

Abstract: A power inverter comprises a power module connected at least to a rotating electric machine, a gate drive circuit board which supplies switching power to the power module, and a rotating electric machine control circuit board which supplies a signal for controlling the waveform of the switching power to the gate drive circuit board. A noise reduction board is formed on a board different from the rotating electric machine control circuit board. The configuration of the noise reduction board is such that various signals for forming a signal for controlling the waveform of the switching power by means of the rotating electric machine control circuit board are inputted through the noise reduction board to the rotating electric machine control circuit board.

Abstract: Connection portions (225UP through 225WP) to which upper arm control terminals (320UU through 320UW) are connected are disposed at a first edge portion of a drive circuit board (22). And connection portions (225UN through 225WN to which lower arm control terminals (320LU through 320LW) are connected are disposed at a second edge portion of the drive circuit board (22). Upper arm implementation regions (227UP through 227WP), lower arm implementation regions (227UN through 227WN), and a low voltage pattern region (228) in which photo-couplers (221U through 221W) are implemented are formed in the board region between these board edge portions. And signal wiring (40U) that transmits a control signal from a photo-coupler (221U) to an implementation region (227UN) is formed in a conductor layer that is a lower layer than the conductor layer in the lower arm implementation region in which the lower arm driver circuit is implemented.

Abstract: A discharge circuit for a DC power supply smoothing capacitor that is used in a power conversion device that supplies DC power via a switch to the DC power supply smoothing capacitor and an inverter, includes; a resistor that discharges charge in the capacitor; a switch connected in series with the resistor, that either passes or intercepts discharge current flowing from the capacitor to the resistor; a measurement circuit that measures a terminal voltage of the capacitor; and a control circuit that controls continuity and discontinuity of the switch; wherein the control circuit, after having made the switch continuous and starting discharge of the capacitor by the resistor, if a terminal voltage of the capacitor as measured by the measurement circuit exceeds a voltage decrease characteristic set in advance, makes the switch discontinuous and stops discharge by the resistor.

Abstract: A power inverter comprises a power module connected at least to a rotating electric machine, a gate drive circuit board which supplies switching power to the power module, and a rotating electric machine control circuit board which supplies a signal for controlling the waveform of the switching power to the gate drive circuit board. A noise reduction board is formed on a board different from the rotating electric machine control circuit board. The configuration of the noise reduction board is such that various signals for forming a signal for controlling the waveform of the switching power by means of the rotating electric machine control circuit board are inputted through the noise reduction board to the rotating electric machine control circuit board.

Abstract: A power inverter comprises a power module connected at least to a rotating electric machine, a gate drive circuit board which supplies switching power to the power module, and a rotating electric machine control circuit board which supplies a signal for controlling the waveform of the switching power to the gate drive circuit board. A noise reduction board is formed on a board different from the rotating electric machine control circuit board. The configuration of the noise reduction board is such that various signals for forming a signal for controlling the waveform of the switching power by means of the rotating electric machine control circuit board are inputted through the noise reduction board to the rotating electric machine control circuit board.