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    • 4. 发明专利
    • Multi-output power supply circuit
    • 多输出电源电路
    • JP2013115962A
    • 2013-06-10
    • JP2011261319
    • 2011-11-30
    • Nichicon Corpニチコン株式会社
    • INOMATA MARE
    • H02M3/305H02H9/04H02M3/28
    • PROBLEM TO BE SOLVED: To provide a multi-output power supply circuit that is capable of easily canceling a conduction state of a thyristor at the time of overvoltage detection.SOLUTION: A multi-output power supply circuit includes: a transformer T having a primary winding N1 and secondary windings N2 and N3 that receive input of a switching voltage obtained by switching an input voltage Vi; a DC output circuit 5 that DC-converts an AC voltage induced by the secondary winding N3 using DC conversion means 6 and outputs an output voltage Vo2; an overvoltage protection circuit 7 that performs an overvoltage protection operation by turning off a transistor Q2 connected to an output side of the DC conversion means through setting of a thyristor SCR in a conduction state; a DC-DC converter 9 that is provided on an output side of the overvoltage protection circuit in a freely disconnectable manner and receives input of a DC voltage outputted from the overvoltage protection circuit; and connection means 8 for disconnectably connecting the output side of the overvoltage protection circuit and an input side of the DC-DC converter to each other, wherein when the connection means disconnects the output side of the overvoltage protection circuit and the input side of the DC-DC converter from each other, a current path passing through the thyristor is cut off.
    • 要解决的问题:提供能够在过电压检测时容易地消除晶闸管的导通状态的多输出电源电路。 解决方案:多输出电源电路包括:具有初级绕组N1和次级绕组N2和N3的变压器T,其接收通过切换输入电压Vi获得的开关电压的输入; 直流输出电路5,其使用DC转换单元6对由次级绕组N3感应出的交流电压进行DC转换,并输出输出电压Vo2; 过电压保护电路7,其通过在导通状态下设置晶闸管SCR来断开连接到DC转换装置的输出侧的晶体管Q2,从而进行过电压保护动作; DC-DC转换器9,其以可自由切断的方式设置在过电压保护电路的输出侧,并接收从过电压保护电路输出的直流电压的输入; 以及用于将过电压保护电路的输出侧与DC-DC转换器的输入侧彼此断开连接的连接装置8,其中当连接装置断开过电压保护电路的输出侧和DC的输入侧时 -DC转换器,切断通过晶闸管的电流路径。 版权所有(C)2013,JPO&INPIT