Electric power conversion systems – Current conversion – With voltage multiplication means
Patent
1995-02-01
1995-10-31
Pellinen, A. D.
Electric power conversion systems
Current conversion
With voltage multiplication means
307110, H02M 318
Patent
active
054635420
ABSTRACT:
There is provided a circuit for achieving a serial communication at the standard voltage defined in the RS-232 interface communication standard when the signal processing voltage of the host side circuit is 5 V and 3 V, for example, in which, when the DC input voltage V.sub.in of the host side circuit is changed, this voltage level is detected to generate a stepped-up voltage having an appropriate step-up ratio by step-up circuits. This voltage level is detected to, regardless of the change of the power supply voltage, obtain the positive and negative DC output voltages Vdd, Vss matching with the RS-232 interface communication standard. To be specific, with the 5 V operation, a double stepped-up voltage within the DC/DC converter circuit and, during the 3 V operation, a three times stepped-up voltage are selectively generated to obtain the DC output voltage.
REFERENCES:
patent: 4199806 (1980-04-01), Patterson, III
patent: 4999761 (1991-03-01), Bingham et al.
patent: 5095223 (1992-03-01), Thomas
patent: 5159543 (1992-10-01), Yamawaki
NEC Corporation brochure, pp. 1206-1218, 1992.
Han Y. Jessica
NEC Corporation
Pellinen A. D.
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