Electric power conversion systems – Current conversion – With means to connect the input to diverse power sources
Patent
1985-05-20
1987-06-23
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to connect the input to diverse power sources
323272, H02M 704
Patent
active
046758011
ABSTRACT:
A power transfer circuit includes a power transformer (2) having a center tap (12) provided in its secondary winding, a full-wave rectifier circuit (13), a level discriminator circuit (15) and a switching circuit (14). In response to a level discrimination made by the level discriminator circuit that a DC voltage outputted from one output terminal of the full-wave rectifier circuit is less than a predetermined voltage level, a transistor (Q1) and a thyristor (SCR) of the switching circuit are made conductive so as to ground the other output terminal of the full-wave rectifier circuit. In response to a level discrimination made by the level discriminator circuit that the DC voltage outputted from the said one output terminal of the full-wave rectifier circuit exceeds the predetermined voltage level, a diode (D9) connected to the center tap of the power transformer is made conductive to ground the center tap. Thus, the full-wave rectifier circuit outputs a constant DC voltage even if AC voltages at different levels are inputted in the primary winding of the power transformer.
REFERENCES:
patent: 3205426 (1965-09-01), Mills
patent: 4001668 (1977-01-01), Lewis
Winchester, Charles R., "Power-Supply Voltage Changed 2:1 with SPDT Switch Arrangement", Electronic Design, Feb. 16, 1976, p. 174.
Brown, D. J., "Un Cambia-Tensione Insolito per Alimentatori", Electron. Oggi (Italy), Oct. 1981, p. 328.
Hoff Marc S.
Sharp Kabushiki Kaisha
Wong Peter S.
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