Electric power conversion systems – Current conversion – Constant current to constant voltage or vice versa
Patent
1999-01-28
1999-11-02
Nguyen, Matthew
Electric power conversion systems
Current conversion
Constant current to constant voltage or vice versa
323316, 327103, H02M 700, G05F 320
Patent
active
059782412
ABSTRACT:
Apparatus for converting input voltage to output current is disclosed herein. The apparatus mentioned above includes an input stage and a tuning stage. The input stage is used to generate a gate voltage corresponding to the input voltage, which is electrically coupled to the power source and ground. The input stage includes buffering means, a transistor, a resistor, and a first current repeating means. The first current repeating means generates the operational current responding to the current repeating transistor, and the input voltage is electrically coupled to the resistor by two input terminals of the buffering means. The gate of the transistor is connected to the output terminal of the buffering means, and the drain of the transistor is connected to the resistor and one of the two input terminals of the buffering means. The first current repeating means is used to repeat the operational current, and the local feed back is performed by connection between the buffering means, the transistor, and the resistor. The tuning stage is used to adjust the transconductance of the transconductor. The tuning stage generates the output current responding to the first control voltage, the second control voltage, and the gate voltage at the output terminal of the buffering means. The tuning stage includes a pair of transistors and the second current repeating means. The second current repeating means repeat the operational current, and the output current pass through the output terminal of the pair of transistors.
REFERENCES:
patent: 4675594 (1987-06-01), Reinke
patent: 5061907 (1991-10-01), Rasmussen
patent: 5559470 (1996-09-01), Laber et al.
patent: 5578965 (1996-11-01), Kimura
patent: 5661432 (1997-08-01), Chang et al.
patent: 5825167 (1998-10-01), Ryat
Industrial Technology Research Institute
Nguyen Matthew
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