| 摘要 |
PURPOSE:To eliminate a four-way valve of a heat pump type air conditioner by replacing two of three phases of control signals of 3-phase inverter and perform nomal/reverse rotations of a compressor. CONSTITUTION:When signals from 3-phase signal generators 12(U-phase), 13(V- phase) 14(W-phase) are respectively input to the bases B1-B6 of the U-phase, V- phase and W-phase of a bridge circuit 11 which uses power transistors of an inverter 16, a compressor 18 is normally rotated to become a heating operation. On the other hand, when a switch 15 is closed to switch contacts 15a-15c to switch 3-phase signal generators 12(U-phase) and 13(V-phase), the compressor 18 is reversely rotated to become a cooling operation. Thus, a heat pump type four-way valve can be omitted. |
