A control device for a vehicle-mounted apparatus, the control device includes: a second CPU state judging section provided to the first CPU, and configured to judge a state of the second CPU based on a state of the inter-CPU communication and a voltage value of the electric power supplied from the first electric power supply section, or the second reset signal; and a first CPU state judging section provided to the second CPU, and configured to judge a state of the first CPU based on the state of the inter-CPU communication and a voltage value of the electric power supplied from the second electric power supply section, or the first reset signal.

A system includes a control board comprising: a microprocessor configured to output a PWM signal; a primary shutoff path circuit, an upper MOSFET shutoff circuit, and a lower MOSFET shutoff circuit, each of the circuits configured to receive the PWM signal; a first buffer provided at an output of the primary shutoff path circuit; a second buffer provided at an output of the upper MOSFET shutoff circuit; a third buffer provided at an output of the lower MOSFET shutoff circuit; a first resistor and a second resistor provided in parallel at the first buffer and configured to provide a first feedback signal; a third resistor and a fourth resistor provided in parallel at the second buffer and configured to provide a second feedback signal; and a fifth resistor and a sixth resistor provided in parallel at the third buffer and configured to provide a third feedback signal.

A system includes a control board comprising: a microprocessor configured to output a PWM signal; a primary shutoff path circuit, an upper MOSFET shutoff circuit, and a lower MOSFET shutoff circuit, each of the circuits configured to receive the PWM signal; a first buffer provided at an output of the primary shutoff path circuit; a second buffer provided at an output of the upper MOSFET shutoff circuit; a third buffer provided at an output of the lower MOSFET shutoff circuit; a first resistor and a second resistor provided in parallel at the first buffer and configured to provide a first feedback signal; a third resistor and a fourth resistor provided in parallel at the second buffer and configured to provide a second feedback signal; and a fifth resistor and a sixth resistor provided in parallel at the third buffer and configured to provide a third feedback signal.

A commutation error compensation method for an electric motor includes: when a rotor, that has not been corrected, in an electric motor rotates in a set direction, collecting a position signal and a three-phase current signal of the rotor, wherein the position signal of the rotor represents the rotation angle of the rotor; filtering processing on the three-phase current signal to obtain a fundamental component of the three-phase current signal, and determining a position error compensation signal of the electric motor on the basis of the fundamental component of the three-phase current signal; determining an ideal phase interval of the rotor according to the position error compensation signal and the position signal of the rotor; and determining an adjustment method for the rotor of the electric motor according to the ideal phase interval of the rotor, and commutating the rotor of the electric motor according to the adjustment method.

A control device includes a control circuit configured to control an inverter circuit that drives a motor by a plurality of switching elements coupled between DC buses, a first power supply system using a voltage source different from the DC buses as a power supply, a second power supply system using the DC buses as a power supply, and a switching circuit configured to switch a power supply system that supplies power to the control circuit from the first power supply system to the second power supply system when an abnormality in the first power supply system is detected. The control circuit continues control of the inverter circuit with a power consumption lower than that before the abnormality is detected in the first power supply system, when the abnormality is detected.

An ECU independently controls power supply to two winding systems in a motor on a per-winding-system basis based on current command values each calculated for a corresponding winding system in accordance with a target assist torque. When a first winding system fails, the ECU transitions from a first state in which the ECU causes the winding groups of the two winding systems to produce the target assist torque to a second state in which the ECU causes the winding group of the other normal winding system to produce the target assist torque. If the current command value for the normal winding system is equal to or below a current threshold value that is set with reference to zero or a value close to zero when the failed winding system recovers to its normal state in the second state, the ECU transitions from the second state to the first state.

A motor driving device for driving a motor having multiple windings corresponding to multiple phases, respectively, may include: a first inverter including multiple first switching elements and connected to a first end of each of the multiple windings; a second inverter including multiple second switching elements and connected a second end of each of the multiple windings; a third switching element configured to connect/disconnect points, at which the number of turns of each of the multiple windings is partitioned based on a predetermined ratio, to/from each other; and a controller configured to control, based on the required output of the motor, an on/off state of the first switching elements to the third switching element.

A motor driving device for driving a motor having multiple windings corresponding to multiple phases, respectively, may include: a first inverter including multiple first switching elements and connected to a first end of each of the multiple windings; a second inverter including multiple second switching elements and connected a second end of each of the multiple windings; a third switching element configured to connect/disconnect points, at which the number of turns of each of the multiple windings is partitioned based on a predetermined ratio, to/from each other; and a controller configured to control, based on the required output of the motor, an on/off state of the first switching elements to the third switching element.

A method includes determining whether a multiphase electric machine is unstable. The method also includes, in response to a determination that the multiphase electric machine is unstable, setting a gate voltage of a first three terminal semiconductor switch to zero. The method also includes, in response to a determination that the multiphase electric machine is stable, setting the gate voltage of the first three terminal semiconductor switch to nonzero. The method also includes, in response to the first three terminal semiconductor switch being set to zero, increasing electrical conduction from one phase of the multiphase electric machine to another phase of the multiphase electric machine. The method includes, in response to the first three terminal semiconductor switch being set to nonzero, increasing electrical resistance from the one phase of the multiphase electric machine to the another phase of the multiphase electric machine.

A compressor and a control method thereof are provided. The compressor includes a motor with a rotor of a permanent magnet. According to embodiments, the method of controlling the compressor includes: applying a detection current to the motor in response to a command of starting the compressor; detecting whether there is demagnetization of the permanent magnet of the rotor according to a response of the motor to the applied detection current; resetting an operating parameter of the compressor if there is the demagnetization; and starting the compressor according to the reset operating parameters. According to embodiments of the present disclosure, when the compressor is to be started, demagnetization is detected first, and the operating parameter are set accordingly, so as to suppress or avoid performance degeneration due to the demagnetization.