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图1的回路中直流电源中间抽头,在交流输出的交替半周中导通主可控硅SCR1和SCR2以传送电流到负载去。当负载为带电感性的,续流二极管D_1和D_2在每半周的部分时间内把负载处的功率传送回直流电源。主可控硅SCR的换流是由同电容器C和电感L联结在一起的辅助可控硅SCR1(A)和SCR2(A)实现的。并由电容器C和电感L产生脉冲。为使主可控硅SCR1换流,辅助可控硅SCR1(A)触发,而使主可控硅SCR2换流,则触发SCR2(A)。这种回路可以在很宽广的频率范围内应用,一直到5KC,或其周期约比典型可控硅关断时间的10倍略长一点。
In the circuit of FIG. 1, the DC power supply center tap tunes the main thyristors SCR1 and SCR2 in alternate half-cycles of the AC output to deliver the current to the load. When the load is inductive, the freewheeling diodes D_1 and D_2 transmit the power at the load back to the DC power source during part of each half-cycle. The commutation of the main thyristor SCR is achieved by the auxiliary thyristors SCR1 (A) and SCR2 (A) which are connected together with the capacitor C and the inductor L. FIG. Pulsed by capacitor C and inductor L. SCR2 (A) is triggered for commutating the main thyristor SCR1 and assisting the thyristor SCR1 (A) to trigger, while the main thyristor SCR2 commutates. This circuit can be used over a wide frequency range up to 5KC, or about a few times longer than typical SCR turn-off times.