Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1994-09-13
1997-05-06
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
307 87, 307 73, H02M 112
Patent
active
056277377
ABSTRACT:
A power inverter for use in the system interconnection of a direct-current supply with a commercial alternating-current supply includes an inverter circuit and a filter circuit. Feedback signals affecting the frequency of an output to be produced by the inverter circuit are taken from the filter circuit having frequency response characteristics such that the phase angle is reduced to 0.degree. at three frequencies consisting of a higher frequency, lower frequency and commercial frequency, the last of which lies halfway between the first and second. Under the normal condition, the frequency of the output produced by the inverter circuit is equal to the commercial frequency. In the event of a power failure or power cut in the commercial alternating-current supply system, deviation from the commercial frequency is caused by the characteristics of the filter circuit.
REFERENCES:
patent: 4366389 (1982-12-01), Hussey
patent: 4782241 (1988-11-01), Baker et al.
patent: 4819121 (1989-04-01), Saito et al.
patent: 5221862 (1993-06-01), Fiorina et al.
patent: 5422518 (1995-06-01), Sashida
Abstracts of Japanese Patent Applications Laid-Open Nos. 6-14465/1994, 6-245388/1994, 6-311653/1994, 6-327258/1994.
Horio Wataru
Ike Takehito
Lu Ding
Maekawa Masahiro
Makino Yasuhiro
Riley Shawn
Sanyo Electric Co,. Ltd.
Wong Peter S.
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