Patent ID: 8245523

Claim:
An air conditioner comprising: a plurality of indoor units; and at least one outdoor unit, wherein the outdoor unit includes an outdoor heat exchanger for condensing a coolant, a compressor for compressing a coolant evaporated by an indoor heat exchanger, an outdoor fan, and a control box including a control unit for controlling operations of the compressor and the outdoor fan, wherein the control unit which has a first block comprising a compressor inverter for controlling a compressor motor, a second block comprising a plurality of fan motor inverters for driving a plurality of fan motors, a third block comprising a system controller for controlling the operation of the outdoor unit, a fourth block comprising a filter for removing noise from input three-phase power, and a fifth block to which the input three-phase power is applied, the first, second, third, fourth and fifth blocks being mounted on different substrates, wherein the control box is disposed between the compressor and the outdoor fan, and the control box has a step difference so that the fourth block of the control unit is disposed below other blocks of the control unit, wherein the first block further comprises a power factor compensation (PFC) circuit which compensates the power factor of the input three-phase power, wherein the system controller controls the compressor inverter, the fan motor inverters, and the PFC circuit, wherein the system controller controls a first and a second fan motors of the plurality of fan motors at the same time.