Air conditioner

Electricity: motive power systems – Synchronous motor systems – Armature winding circuits

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Details

318798, 318808, 318254, 62 89, 62209, H02P 540

Patent

active

059295910

ABSTRACT:
For achieving an air conditioner being applicable to various a-c source voltages in common and operative with high power factor by suppressing generation of high harmonics, an a-c source voltage from an a-c electric power source 1 is rectified in full-wave by a rectifier 2, and a d-c source voltage Ed of an inverter 13 is obtained by being charged in a condenser 5. Here, there are a-c source voltages of 100 V and 200 V, and a divided voltage Ed1 of the d-c voltage of the condenser 5 is selected when the a-c source voltage is 100 V, a divided voltage Ed2 (here, Ed1>Ed1) of the d-c voltage of the condenser 5 is selected when the a-c source voltage is 200 V, respectively by an exchange switch 18, and is used as a d-c voltage Ed' for controlling on and off of a switch element 6. Though the d-c source voltage Ed differs depending on the a-c source voltage of 100 V or 200 V, it is possible to set the d-c source voltage Ed at a voltage value for operating the inverter 13 with low loss and high efficiency, for each one of the a-c source voltages, by setting a ratio of the voltage division appropriately.

REFERENCES:
patent: 4686834 (1987-08-01), Haley et al.
patent: 4726738 (1988-02-01), Nakamura et al.
patent: 4736143 (1988-04-01), Nakamura et al.
patent: 4856286 (1989-08-01), Sulfstedo et al.
patent: 4879502 (1989-11-01), Endo et al.
patent: 5519301 (1996-05-01), Yoshida et al.

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