Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1980-12-02
1983-01-18
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
323208, 363126, H02M 114
Patent
active
043694900
ABSTRACT:
To provide a power rectifier for connection to an a-c power network which has low ripple at the d-c output, and low harmonic content at the a-c side, particularly for feeding a d-c - a-c inverter frequency generator providing output in the audio or low supersonic range for supply of gas discharge or fluorescent lamps, a wave-shaping network is connected to the a-c side of a standard bridge rectifier unit such that the a-c power applied to the rectifier is of approximately trapezoidal or rectangular or square-wave shape; a suitable network is the combination of an inductance (D) and a storage capacitor(C1) in a T-network or in a series resonant circuit, in which the quadrature VA of the choke (D), at network frequency, is about 60% of the power to be supplied by the rectifier, with a capacitor (C1) in a T-network configuration of such value that the resonant frequency of the L/C circuit is about 2.2 to 2.6 times network frequency or equal to network frequency, when in a series resonant circuit. Splitting the inductance (D) into two winding portions, one in each one of the supply lines substantially reduces radio interference from a connected gas discharge lamp.
REFERENCES:
patent: 3978388 (1976-08-01), de Vries
patent: 4127893 (1978-11-01), Goepel
patent: 4188661 (1980-02-01), Bower et al.
patent: 4222096 (1980-09-01), Capewell
Beha Jr. William H.
Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen
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