A feedback control switching unit of an inverter control unit selects, based on a magnitude relationship between a predetermined switching determination amount and at least one switching threshold, at least one of feedback control units to thereby execute switching among feedback control modes, such as a current feedback control mode and a torque feedback control mode, of the respective feedback control units for driving of the AC motor. A switching command generating unit generates a switching command for an inverter based on a manipulated variable calculated by the selected feedback control unit. When a torque response request determining unit determines that a required torque responsiveness is high, the feedback control switching unit reduces the number of executions of switching among the feedback control modes.

A power converting apparatus and a home appliance having the same according to the present invention includes: an input unit including an AC connection unit which receives an alternating current (AC) power from an external and a DC connection unit which receives a direct current (DC) power; a bridge diode unit which always outputs the DC power having a given polarity when DC power is connected to the input unit, and rectifies the AC power received through the input unit when the DC power is connected to the input unit; and a capacitor which is connected to a DC terminal which is an output terminal of the bridge diode unit.

A power converting apparatus and a home appliance having the same according to the present invention includes: an input unit including an AC connection unit which receives an alternating current (AC) power from an external and a DC connection unit which receives a direct current (DC) power; a bridge diode unit which always outputs the DC power having a given polarity when DC power is connected to the input unit, and rectifies the AC power received through the input unit when the DC power is connected to the input unit; and a capacitor which is connected to a DC terminal which is an output terminal of the bridge diode unit.

An air-conditioning apparatus includes: a plurality of compressors included in one or more refrigerant circuits which air-condition a target space to be air-conditioned; a power converter which converts electric power supplied from a power source unit and supply the compressors with electric power for driving the compressors at an arbitrary drive rotation speed; a switching device which perform switching between a power supplying operation to cause each of the compressors to be supplied with electric power from the power converter and a power supplying operation to cause each of the compressors to be supplied with electric power directly from the power source unit; and a controller which controls the power converter and the switching device.

An air-conditioning apparatus includes: a plurality of compressors included in one or more refrigerant circuits which air-condition a target space to be air-conditioned; a power converter which converts electric power supplied from a power source unit and supply the compressors with electric power for driving the compressors at an arbitrary drive rotation speed; a switching device which perform switching between a power supplying operation to cause each of the compressors to be supplied with electric power from the power converter and a power supplying operation to cause each of the compressors to be supplied with electric power directly from the power source unit; and a controller which controls the power converter and the switching device.

A power supply system includes a first drive motor, a second drive motor, a first power line to which a first inverter and a first battery are connected, a second power line to which a second inverter and a second battery are connected, a voltage converter that converts a voltage between the first power line and the second power line, and an ECU that operates the first and second inverters and and the voltage converter and controls charging and discharging of the first and second batteries. In a case where total required power is larger than first outputtable power of the first battery, the ECU discharges a shortage of power from the second battery to the second power line, wherein the shortage of power is obtained by excluding an amount that is output by the first battery from the total required power.

A vehicle power supply system includes a first power line to which a first inverter and a first battery are connected, a second power line to which a second inverter and a second battery are connected, a voltage converter, a charging and discharging control device that operates the inverters and the voltage converter, and a second regenerable electric power acquisition unit that acquires second regenerable electric power. The charging and discharging control device charges the second battery with second regenerative electric power that is power supplied from the second inverter to the second power line during regenerative deceleration, and supplies second surplus regenerative electric power to the first power line in a case where the second regenerative electric power is larger than the second regenerable electric power, wherein the second surplus regenerative electric power is obtained by excluding the second regenerable electric power from the second regenerative electric power.

In a so-called dual power source and dual inverter system, in which a pair of first and second inverters controls and drives a motor that includes multiple windings of phases each having open ends based on electric power supplied from a pair of power supplies, a motor driving system capable of appropriately allocating the electric power supplied from the pair of power supplies to the pair of inverters is provided. The motor driving system includes a pair of first and second inverter control circuits to generate a pair of first and second voltage instructions supplied to the first and second inverters based on a torque command, respectively. One of the first and second inverter control circuits includes a power controller that controls sharing of the electric power supplied from the first and second power supplies in accordance with a target electric power instruction.

In a so-called dual power source and dual inverter system, in which a pair of first and second inverters controls and drives a motor that includes multiple windings of phases each having open ends based on electric power supplied from a pair of power supplies, a motor driving system capable of appropriately allocating the electric power supplied from the pair of power supplies to the pair of inverters is provided. The motor driving system includes a pair of first and second inverter control circuits to generate a pair of first and second voltage instructions supplied to the first and second inverters based on a torque command, respectively. One of the first and second inverter control circuits includes a power controller that controls sharing of the electric power supplied from the first and second power supplies in accordance with a target electric power instruction.

A motor controller, including: a microprocessor including a signal identification unit; an inverter circuit; a rotation speed detection circuit; a power module; and an isolation circuit. The power module supplies power for the microprocessor, the inverter circuit, the rotation speed detection circuit, and the isolation circuit. The isolation circuit is connected to the microprocessor via a pulse width modulation (PWM) input line, and a PWM signal is transmitted to the isolation circuit and the microprocessor successively via the PWM input line. One rotation speed input signal of a motor is transmitted to the signal identification unit of the microprocessor via the isolation circuit and the PWM input line. The signal identification unit determines whether an input signal of the PWM input line is the PWM signal or the one rotation speed input signal of the motor.