From the views of suppressing the switching stress and ensuring wide ZCS operation region, the value of β is suitable between β=0.5 and β=0.8. Consequently the circuit is designed so that the value of βis set to β= 0.5 at Curie temperature and is set to β=0.8 at exceeding Curie temperature. As for the value ofp, p=0.2 is suitable as the value of suppressing the switching stress.

　

Fig. 8 Distribution of Vsmax^*

(α=0.05, β=0.5, p=0.2)

Fig.9 Distribution of Vsmax^*

(α=0.05, β=0.8, p=0.2)

Fig. 10 Distribution of Ismax^*

(α=0.05, β=0.5, p=0.2)

Fig. 11 Distribution of Ismax^*

(α=0.05, β=0.8, p=0.2)

Fig. 12 Distribution of Po^*

(α=0.05, β=0.5, p=0.2)

Fig. 13 Distribution of Po^*

(α=0.05, β=0.8, p=0.2)

　

　

4.3 Switching stress within ZCS operation region

Fig. 8 and Fig.9 show the distribution of the maximum voltage of switch of Vsmax^* as switching stress within ZCS operation region at β=0.5 and β=0.8, respectively. In these figures, Vsmax^* is suppressed to less than 1.2 in case the normalized frequency of μ is less than μ=3.0.

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