H - Electricity – 02 – J
Patent
H - Electricity
02
J
73/168, 321/24,
H02J 1/00 (2006.01) H02H 6/00 (2006.01)
Patent
CA 1079803
ABSTRACT OF THE DISCLOSURE A thermal protection system is provided for a solid state valve that includes at least one representative thyristor having a junction and a heat sink system. The protection system comprises a thermal analog model whose electrical network dynamic electrical operating characteristics are electrically analogous to the thermal characteristics of the solid state valve for any given value of instantaneous load current supplied through the solid state valve, which thermal characteristics include the heat transfer to cooling fluid capability characteristics of said representative thyristor including its heat sink system. A first electrical signal is derived which is representative of the value of the D.C. load current through the valve. A D.C. current to watts generation simulation network responsive to the first electric signal is provided for driving an output electrical signal representative of the instantaneous value of the watts being dissipated within the junction of said representative thyristor for a given value of load current flowing through said junction. The watts-being- generated signal is applied to said thermal analog model and an output electric signal is derived from said thermal analog model which is representative of the temperature of said thyristor junction.
299535
Chandler Edgar F.
Demarest Donald M.
LandOfFree
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