| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to conserve the energy of an air conditioner by connecting a switching power source at the input side to the output side of a DC power source, thereby protecting the motor driver without operating the DC power source. SOLUTION: A first driving circuit 3 has six power transistors between a positive power supply path 3a and a negative power supply path 3b and turns on, off the transistors based on the command from a controller 7 to control a compressor motor 5. Similarly to the circuit 3, power transistor group between positive and negative power supply paths 4a and 4b is turned on, off based on the command from the controller 7 to control a DC brushless motor 6. The input side of a switching power source 2 is connected to the output terminal of the power source 1 together with the paths 3a, 3b of the first circuit 3 and the paths 4a, 4b of the circuit 4. Thus, the energy of an air conditioner can be conserved. |
