A low-cost opto-electronic method of measuring convertor output currents is proposed serving to overcome the inherent non-linearity of the simple opto-coupler. The design concept and performance of a laboratory-built transducer are described. Over the full operating range much reduced distortion is achieved. The method is useful for feedback control applications.
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References
1.
ArrillagaJ., and BaldwinD. G., ‘Direct digital closed-loop control of h.v.d.c. convenors’, Proc. IEE, 121, No. 12, pp. 1567–1571, (1974).
2.
ShoreN. L. and FrerisL. L., ‘Minicomputer online control of d.c. link converters’, ibid., 125, No. 3, pp. 215–220, (1978).
3.
BoseB. K. and JentzenK. J., ‘Digital speed control of a d.c. motor with phase-locked loop regulation’, IEEE Trans., IECI-25, pp. 10–13, (1978).
4.
OlivierG.StefanovicV. R. and JamilM. A., ‘Digitally controlled thyristor current source’, ibid., IECI-26, pp. 185–191, (1979).
5.
OhmaeT.MatsudaT.SuzukiT.AzusawaN.KamiyamaK. and KonishiT., ‘A microprocessor-controlled fast-response speed regulator with dual mode current loop for dcm drives’, ibid., IA-16, pp. 388–394, (1980).
6.
TsoS. K. and HoP. T., ‘Dedicated-microprocessor scheme for thyristor phase control of multiphase convenors’, IEE Proc. B., Electr. Power Appl., 128, No. 3, pp. 101–108, (1981).
7.
ErezA., ‘Low-frequency electrical signal measurement by electrooptical methods’, IEEE Trans., IM-21, pp. 358–360, (1972).
8.
GagginiG.ManfrediP. F.MaranesiP. and TriulziG., ‘Isolation amplifier with combined magnetic and optical coupling’, ibid., IM-24, pp. 115–117, (1975).
