Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1980-10-15
1983-03-29
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
340310R, 363 37, H02M 545, H02M 7515
Patent
active
043785336
ABSTRACT:
A modulator for injecting signals into a polyphase power transmission system includes a bridge of four thyristors for each phase. The thyristors of each bridge are connected so that when the thyristors of two opposite arms are ignited simultaneously they produce a signal at the output from the modulator of opposite sense to the corresponding signal when the thyristors of the two other opposite arms are ignited. The thyristors of the adjacent arms are controlled in opposition and coupled by an induction coil having two windings which, through the back EMF generated by mutual inductance, causes the extinction of one of them when the other is ignited. The energy stored in the induction coil at the time of the extinction phase is dissipated as heat in a resistor provided for this purpose in a loop which does not contain the supply.
REFERENCES:
patent: 3825813 (1974-07-01), Wirtz
patent: 3866098 (1975-02-01), Weiser
J. C. Vander Meer, "Component Selection for Solid State Crane Drives", IEEE Conference Paper No. 71 CP 722; Aug. 24, 1971, 5 pp.
Enertec SA
Gaudier Dale
Grimm Siegfried H.
Westin Edwared P.
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