Patent ID: 6815927
Filing Date: 2004-11-09
Classification: H02P

Abstract:
An air conditioning apparatus comprising:a DC power supply; at least one first switching mechanism; and a drive circuit, wherein said drive circuit comprises: an inverter comprising a plurality of switching elements, wherein said inverter is directly connected to a positive terminal of said DC power supply and is directly connected to a negative terminal of said DC power supply; a DC to DC converter, wherein a positive terminal of said DC to DC converter is connected directly to said positive terminal of said DC power supply through said at least one first switching mechanism; a switching element circuit coupled to said inverter and to said DC to DC converter, wherein said switching element circuit activates and deactivates said plurality of switching elements; and a feedback circuit coupled to said switching element circuit and to said DC to DC converter, wherein said feedback circuit controls said switching element circuit in response to an angular position of a rotor.