The total energy dissipated by the SSPC is obtained by integrating (2.4) within the boundaries UT and Uo ■ UT is the voltage which has been built up in the capacitor when the SSPC goes in the constant current mode. In order to avoid complicated procedures for calculating UT, the following linear approximation will be used: x represents a new independent variable which indicates the ratio between limitation current of the SSPC and steady state load current Iss. Evidently the SSPC will dissipate energy only when it is actually driven in the constant current mode, i.e. when Where Im is the current maximum according to (1.17). Thus, (2.10) is valid for:
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