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发明授权
CN107453610B 反激式变换器及其有源箝位控制电路和有源箝位控制方法 有权 许可

反激式变换器及其有源箝位控制电路和有源箝位控制方法
摘要：
本申请公开了反激式变换器及其有源箝位控制电路和有源箝位控制方法。所述反激式变换器采用主开关管为变压器提供电能，以及采用辅助开关管提供所述变压器的漏感能量的释放路径，其中，所述有源箝位控制电路控制所述主开关管和所述辅助开关管的导通状态，使得所述辅助开关管在至少一个开关周期中导通第一时间段，所述主开关管在每个开关周期中导通第二时间段，所述第一时间段和所述第二时间段是所述开关周期中互不重叠的时间段。该有源箝位控制电路根据主开关管的电感电流峰值控制辅助开关管的导通时间，以充分吸收变压器的漏感能量且减小辅助开关管的损耗。
摘要（英）：

An active clamp control circuit for a flyback converter can be configured to: control turn-on states of a main switch and an auxiliary switch to make the auxiliary switch turn on for a first time period in at least one switching period, and to make the main switch turn on for a second time period in each switching period, where the first and second time periods are non-overlapping periods of the switching period; and compare a peak value of an inductor current flowing through the main switch against a first threshold to adjust the first time period of the auxiliary switch when the peak value of the inductor current is greater than or equal to the first threshold, such that the first time period is directly proportional to the peak value of the inductor current.

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