Abstract: A control device that includes a circuit board, a plurality of heating elements that generate heat that accompanies driving the motor, and a rotation angle sensor that detects a rotation angle of the motor. The circuit board has a power supply input portion to which a driving current of the motor is supplied, a heating element mounting region where the plurality of the heating elements are mounted, and a controller mounting region where the rotation angle sensor is mounted. The power supply input portion, the heating element mounting region, and the controller mounting region are disposed in such an order. The circuit board, as seen from an axial direction of the rotating shaft, protrudes to an outside of a projection region that projects an outer surface of a cylindrical portion of a motor case that surrounds the motor. The power supply input portion is located on a portion out of portions of the circuit board that are on the outside of the projection region.

Abstract: A power conversion device according to the present disclosure has one end connected to a DC voltage source and another end connected to a load, and includes: an inverter circuit which converts DC voltage from the DC voltage source to AC voltage to be outputted to the load, and includes a leg in which an upper arm and a lower arm each having a switching element, and a resistor, are connected in series, and a smoothing capacitor connected in parallel to the leg; a current detection circuit which detects voltage across the resistor, to detect current of the resistor; and a control circuit which controls the inverter circuit. The control circuit corrects the current value detected by the current detection circuit, using an operation condition of the inverter circuit, and controls the inverter circuit using the corrected current value. Thus, error occurring in the current detection circuit can be corrected.

Abstract: Provided is an electric power steering device including: a DC power supply; a motor; an inverter circuit configured to convert a DC power output from the DC power supply to an AC power and output the AC power after the conversion to the motor; and a filter circuit, which is provided between the DC power supply and the inverter circuit, and includes a choke coil. The choke coil includes: a core; and one or more conductor sets each including two conductors wound in parallel on the core. A tip on one side of each of the two conductors included in each of the conductor sets is connected to the DC power supply side, and a tip on another side of each of the two conductors is connected to the inverter circuit side.

Abstract: An object of this invention is to obtain a molded module with which improvements are achieved in the packaging ability and heat dissipation performance of an inverter module itself, and in the mounting capacity of a peripheral mounting component such as a substrate, which must be taken into consideration in relation to the shape of the module. Provided is a molded module for use in power electronics, having an inbuilt semiconductor element used to supply and control a large amount of power, the molded module including at least one semiconductor switching element provided in the module and a lead frame that dissipates heat from the switching element and electrically connects an element packaged in the module to an external circuit, wherein at least one end of the module is molded in a curved shape or a polygonal shape.

Abstract: A frame has upper and lower surfaces that extend in a perpendicular direction to a motor output shaft, donut-shaped conductive plates are mounted respectively on the upper and lower surfaces, and the conductive plates both include connection-forming terminal portions provided on inner and outer peripheral sides thereof. An inverter circuit is constituted by a power module formed from a plurality of switching elements, a power supply terminal is provided on one side of a package forming the power module, while an output terminal connected to a winding terminal for supplying power to a motor and a control terminal connected to a control signal are provided on an opposing side. The terminal portions on the inner peripheral sides of the conductive plates are connected to the power supply terminal of the power module, and the control board is connected to the control terminal of the power module.

Abstract: Provided is an electric power steering device including: a DC power supply; a motor; an inverter circuit configured to convert a DC power output from the DC power supply to an AC power and output the AC power after the conversion to the motor; and a filter circuit, which is provided between the DC power supply and the inverter circuit, and includes a choke coil. The choke coil includes: a core; and one or more conductor sets each including two conductors wound in parallel on the core. A tip on one side of each of the two conductors included in each of the conductor sets is connected to the DC power supply side, and a tip on another side of each of the two conductors is connected to the inverter circuit side.

Abstract: A first mode in which to output analog electricity quantities of objects one by one independently to an A/D converter, a second mode in which to output none of the analog electricity quantities of the objects, a third mode in which to output none of the analog electricity quantities of the objects and cause the output to the A/D converter to be resistor, and a fourth mode in which to output to the A/D converter a plurality of the analog electricity quantities of the objects at the same time, are caused to be generated, thus acquiring the A/D conversion values of the objects individually when in the first mode, and detecting an anomaly of the A/D converter itself or a device connected to the A/D converter when in the second mode to the fourth mode.

Abstract: A first mode in which to output analog electricity quantities of objects one by one independently to an A/D converter, a second mode in which to output none of the analog electricity quantities of the objects, a third mode in which to output none of the analog electricity quantities of the objects and cause the output to the A/D converter to be resistor, and a fourth mode in which to output to the A/D converter a plurality of the analog electricity quantities of the objects at the same time, are caused to be generated, thus acquiring the A/D conversion values of the objects individually when in the first mode, and detecting an anomaly of the A/D converter itself or a device connected to the A/D converter when in the second mode to the fourth mode.

Abstract: A frame has upper and lower surfaces that extend in a perpendicular direction to a motor output shaft, donut-shaped conductive plates are mounted respectively on the upper and lower surfaces, and the conductive plates both include connection-forming terminal portions provided on inner and outer peripheral sides thereof. An inverter circuit is constituted by a power module formed from a plurality of switching elements, a power supply terminal is provided on one side of a package forming the power module, while an output terminal connected to a winding terminal for supplying power to a motor and a control terminal connected to a control signal are provided on an opposing side. The terminal portions on the inner peripheral sides of the conductive plates are connected to the power supply terminal of the power module, and the control board is connected to the control terminal of the power module.

Abstract: A power switch device provides and cuts off power supply to a load in which a MOSFET for causing a direct current power source to be connected and disconnected is provided between power supply lines and the direct current power source, located upstream of the power supply lines, the power supply lines including a ripple capacitor for stabilizing the supply voltage against fluctuations in the load current in the load, powered by the direct current power source. The power switch device is operated to transition power supply from opening to closing by gradually increasing the output voltage of the MOSFET to minimize the value of current charging the ripple capacitor.

Abstract: In view of the problem that an existing technique can detect a failure in an arm circuit for each phase and continue motor drive by only a normal phase, but a brake torque is generated due to a closed circuit of the faulty phase, an inverter apparatus for polyphase AC motor drive is provided that includes: a first power supply switching device in a power supply line to an inverter circuit; a second power supply switching device for each phase in the arm circuit of the inverter circuit, and a motor relay switching device in an output path from each phase, wherein the parasitic diodes of the first power supply switching device and second power supply switching device have directional characteristics different from each other, which prevent generation of a closed circuit.

Abstract: In view of the problem that an existing technique can detect a failure in an arm circuit for each phase and continue motor drive by only a normal phase, but a brake torque is generated due to a closed circuit of the faulty phase, an inverter apparatus for polyphase AC motor drive is provided that includes: a first power supply switching device in a power supply line to an inverter circuit; a second power supply switching device for each phase in the arm circuit of the inverter circuit, and a motor relay switching device in an output path from each phase, wherein the parasitic diodes of the first power supply switching device and second power supply switching device have directional characteristics different from each other, which prevent generation of a closed circuit.

Abstract: An object of this invention is to obtain a molded module with which improvements are achieved in the packaging ability and heat dissipation performance of an inverter module itself, and in the mounting capacity of a peripheral mounting component such as a substrate, which must be taken into consideration in relation to the shape of the module. Provided is a molded module for use in power electronics, having an inbuilt semiconductor element used to supply and control a large amount of power, the molded module including at least one semiconductor switching element provided in the module and a lead frame that dissipates heat from the switching element and electrically connects an element packaged in the module to an external circuit, wherein at least one end of the module is molded in a curved shape or a polygonal shape.

Abstract: A power switch device provides and cuts off power supply to a load in which a MOSFET for causing a direct current power source to be connected and disconnected is provided between power supply lines and the direct current power source, located upstream of the power supply lines, the power supply lines including a ripple capacitor for stabilizing the supply voltage against fluctuations in the load current in the load, powered by the direct current power source. The power switch device is operated to transition power supply from opening to closing by gradually increasing the output voltage of the MOSFET to minimize the value of current charging the ripple capacitor.

Abstract: In an angle detection method with a resolver, the method being for detecting a rotational angle of a rotator by synchronously detecting a first signal and a second signal that are two phase sine wave modulation signals obtained from a one phase excitation/two phase output resolver, the method includes: a first signal detection process which detects a signal in the order of the first signal and the second signal; and a second signal detection process which detects a signal in the order of the second signal and the first signal.

Abstract: An electric power steering device includes: a fail-safe power relay (9a) and a motor relay (10a) for interrupting power supply to an electric-motor driving unit for driving an electric motor for applying an assist torque for steering performed by a driver; and a relay driving circuit (8a) including a switch (13a) connected in parallel to drive coils of the relays (9a and 10a) and a diode (16a). A target value of a relay-contact energizing current is lowered and the relays (9a and 10a) are gradually interrupted while an amount of current corresponding to a back surge generated when the relays are turned OFF is caused to flow back to the diode (16a) of the relay driving circuit (8a) in a normal relay-OFF operation, whereas the relays (9a and 10a) are quickly interrupted without operating the relay driving circuit (8a) in case of detection of an abnormality.

Abstract: In an angle detection method with a resolver, the method being for detecting a rotational angle of a rotator by synchronously detecting a first signal and a second signal that are two phase sine wave modulation signals obtained from a one phase excitation/two phase output resolver, the method includes: a first signal detection process which detects a signal in the order of the first signal and the second signal; and a second signal detection process which detects a signal in the order of the second signal and the first signal.

Abstract: An electric power steering device includes: a fail-safe power relay (9a) and a motor relay (10a) for interrupting power supply to an electric-motor driving unit for driving an electric motor for applying an assist torque for steering performed by a driver; and a relay driving circuit (8a) including a switch (13a) connected in parallel to drive coils of the relays (9a and 10a) and a diode (16a). A target value of a relay-contact energizing current is lowered and the relays (9a and 10a) are gradually interrupted while an amount of current corresponding to a back surge generated when the relays are turned OFF is caused to flow back to the diode (16a) of the relay driving circuit (8a) in a normal relay-OFF operation, whereas the relays (9a and 10a) are quickly interrupted without operating the relay driving circuit (8a) in case of detection of an abnormality.

Abstract: An electric power steering equipment according to the present invention comprises a motor for providing a steering assisting force to a steering shaft, a torque detecting means for detecting a steering torque, an amplifying and phase-compensating means for amplifying and phase-compensating a detected value of the torque detecting means, and a controlling means for controlling a drive of the motor based on an output of the amplifying and phase-compensating means, wherein the controlling means restricts a control signal for driving the motor by an upper limit value and a lower limit value which are set in response to the detected value of the torque detecting means.

Abstract: To keep low the cross frequency of current feedback control and provide a good steering feeling, a first operation expression is selected when a difference &xgr; between a current instruction value computed based on a steering state of a steering wheel and a traveling state of a vehicle and a motor drive current value supplied from a battery to a motor for providing assist force to a system for transmitting power from the steering wheel to the wheels is larger than a predetermined value Th1, a second operation expression is selected when the difference &xgr; is smaller than the predetermined value Th1, and the difference &xgr; is corrected using the selected operation expression.