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    • 34. 发明授权
    • Isolated flyback converter with sleep mode for light load operation
    • 具有睡眠模式的隔离反激式转换器,用于轻载操作
    • US08873254B2
    • 2014-10-28
    • US13418285
    • 2012-03-12
    • John D. MorrisMichael G. NegreteMin Chen
    • John D. MorrisMichael G. NegreteMin Chen
    • H02M3/335
    • H02M3/335H02M2001/0032Y02B70/16
    • A flyback converter uses primary side sensing to sense the output voltage for regulation feedback. A comparator on the primary side detects whether the output voltage has exceeded a predetermined regulated voltage by a first threshold to detect an over-voltage condition, resulting from a current generated by the converter exceeding the load current. Triggering of the comparator causes the converter to enter a non-switching sleep mode, whereby the output voltage droops over a period of time. When the output voltage has drooped below the predetermined regulated voltage by a second threshold, a synchronous rectifier is controlled to turn on, then off, to generate a pulse in the primary winding. Upon detection of the pulse, the sleep mode is terminated, and normal operation resumes until a regulated voltage is achieved or until the first threshold is again exceeded by the output voltage.
    • 反激转换器使用初级侧感测来检测输出电压以进行调节反馈。 初级侧的比较器检测输出电压是否超过预定的调节电压第一阈值,以检测由转换器产生的电流超过负载电流导致的过电压状况。 比较器的触发使得转换器进入非切换睡眠模式,由此输出电压在一段时间内下降。 当输出电压下降到低于预定调节电压第二阈值时,同步整流器被控制为接通,然后关断,以在初级绕组中产生脉冲。 当检测到脉冲时,停止睡眠模式,并且恢复正常操作,直到达到稳定电压或直到输出电压再次超过第一阈值为止。