Electric power conversion systems – Current conversion – With means to selectively provide d.c. of either polarity
Patent
1988-07-21
1989-04-04
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to selectively provide d.c. of either polarity
363126, H02M 702
Patent
active
048191450
ABSTRACT:
In a direct current power unit, a-c (alternating current) voltages outputted to secondary windings (28, 47) of transformers (26, 45) are rectified by rectifier diodes (30a, 30b), respectively, to output a positive d-c (direct current) voltage and a negative d-c voltage. The level of the positive d-c voltage is regulated by a first voltage regulator crcuit (34a) while the level of the negative d-c voltage is regulated by a second voltage regulator circuit (34b). A first switch (36a) and a first variable resistance (38a) as well as a second variable resistance (38b) and a second switch (36b) are connected in series to outputs of the first voltage regulator circuit and the second voltage regulator circuit, respectively. When the first switch is closed and the second switch is opened, the positive d-c voltage is outputted to an output terminal (44) from the first variable resistance through a backflow preventing diode (42a). On the other hand, when the first switch is opened and the second switch is closed, the negative d-c voltage is outputted to the output terminal from the second variable resistance through a backflow preventing diode (42b).
REFERENCES:
patent: 3343064 (1967-09-01), Bright
patent: 3500169 (1970-03-01), Ibsen
patent: 4202032 (1980-05-01), Morez
patent: 4527229 (1985-07-01), Imamura et al.
patent: 4626697 (1986-12-01), Nelson
Murata Manufacturing Co. Ltd.
Wong Peter S.
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