当次级电路接通时，初级电流和次级电流都在铁芯内建立了一个磁通量。
When the secondary circuit is closed, both primary and secondary currents set up a flux in the core.
介绍了用示波器检查初级电流和次级电压波形，通过波形分析诊断出点火线圈的故障。
Through the analysis of the wave of primary current and sub-voltage detected by oscillograph, the malfunction of ignition coil will be diagnosed.
领先桥臂中点电压变换期间，变压器初级电流基本保持最大值，使得领先桥臂容易实现软开关；
In the midpoint voltage of leading leg transition, its soft switching is easily realized because of the primary current of transformer keeping the maximum.
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