| 摘要 |
PROBLEM TO BE SOLVED: To suppress cost increase in a control circuit by lessening the increase of the number of parts. SOLUTION: In an inverter system of air conditioner provided with pulse width modulation (PAM) control, the common line CL1 of a power source 17 for a main control part 17 and a power source 20 for a sensor constituting a power supply unit, the common line CL2 of a power source 18 for a PMM control part and a power source 19 for a PAM control part, and the common line CL3 of a power source 21 for load, are made common, and they are connected to the same GND level, thus they are made into one power source. |
