Patent ID: 9709289
Date: 2017-07-18
CPC Classifications: B60H,F24F,G05B,H02P,Y02T

Claim:
1. A control unit for an air conditioner comprising: first, second, and third half-bridge circuits, each of which having a pair of switching elements; a first DC motor connected between the first and second half-bridge circuits to drive a first door of the air conditioner; a second DC motor connected between the second and third half-bridge circuits to drive a second door of the air conditioner; angle patterns and an origin position pattern provided to each of the first and second DC motors to detect a rotational position thereof; and a controller that controls driving of the first and second DC motors by detecting the rotational position thereof from the angle patterns in reference to the origin position pattern, wherein as a detection operation of the origin position pattern of each of the first and second DC motors, the controller performs a detection of the origin position pattern by controlling each DC motor to rotate toward one side within a detectable range and to stop upon detection of the origin position pattern, and in case where the rotational position reaches one end of the detectable range, the controller performs a detection of the origin position pattern by controlling the DC motor to rotate oppositely from the one side when the other DC motor is stopping, and the controller performs a detection of the origin position pattern by controlling the DC motor to rotate oppositely from the one side after the rotational position of the other DC motor reaches the one end of the detectable range when the other DC motor is rotating.