Air conditioning device

Details Air conditioning device Air conditioning device

1995-06-29

1998-08-11

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 36, 363 37, 363 40, 363 45, H02H 7122

Patent

active

057936234

ABSTRACT:
An air conditioning device is arranged such that an output voltage from a commercial power source is converted into a direct current by a rectifying circuit and a smoothing condenser. Thereafter, it is further converted into an AC voltage having a variable frequency by an inverter under the control of a microcomputer, thereby supplying it to a power compressor. Between the rectifying circuit and the smoothing condenser, an active filter is provided for shaping an input current to be an approximate sine wave almost in phase with an input voltage by switching a power transistor. The switching control section and the microcomputer for controlling the switching are activated independently by separately provided power sources. The switching control section supplies a high level signal when the active filter is a normal condition, and supplies a low level signal when the active filter is abnormal. A circuit which generates a low level signal when the power supply to the switching control section is shut off, is provided. This enables the microcomputer to determine the occurrence of an abnormality in the active filter or the switching control section even when the power supply is shut off.

REFERENCES:
patent: 4268884 (1981-05-01), Ford, Jr. et al.
patent: 4462069 (1984-07-01), Becky
patent: 4677366 (1987-06-01), Wilkinson et al.
patent: 4709292 (1987-11-01), Kuriyama et al.
patent: 4855652 (1989-08-01), Yamashita et al.
patent: 4879502 (1989-11-01), Endo et al.
patent: 4939909 (1990-07-01), Tsuchiyama et al.
patent: 5179842 (1993-01-01), Kanazawa
patent: 5180964 (1993-01-01), Ewing
patent: 5181159 (1993-01-01), Peterson et al.
patent: 5209075 (1993-05-01), Kim
patent: 5214367 (1993-05-01), Uesugi
patent: 5280228 (1994-01-01), Kanouda et al.
patent: 5371667 (1994-12-01), Nakao et al.
patent: 5488834 (1996-02-01), Schwarz
patent: 5515261 (1996-05-01), Bogdan

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