DIGITAL CONTROL UNIT HAVING A TRANSIENT DETECTOR FOR CONTROLLING A SWITCHED MODE POWER SUPPLY
    2.
    发明申请
    DIGITAL CONTROL UNIT HAVING A TRANSIENT DETECTOR FOR CONTROLLING A SWITCHED MODE POWER SUPPLY 审中-公开
    具有用于控制切换模式电源的瞬态检测器的数字控制单元

    公开(公告)号:WO2012103941A3

    公开(公告)日:2013-01-31

    申请号:PCT/EP2011051476

    申请日:2011-02-02

    CPC classification number: H02M3/156 H02M2001/0022

    Abstract: A switched mode power supply (SMPS) comprising a feedback unit, voltage feed forward (VFF) compensation signal generator (1211) and a transient detector (701) is disclosed. A VFF compensation signal is only applied to the output of the feedback unit when a transient is detected by the transient detector (701) on the input voltage of the SMPS, thereby a saving power and computation time. The transient detector (701) comprises a first comparator (402) to detect that a positive transient has occurred if a difference signal is greater than a positive threshold level Cb1Q); a second comparator (403) to determine if the difference signal is within a predetermined range of positive values and output a result that indicates if the difference signal is within the predetermined range of positive values; and a first calculator (405) to detect that a positive transient has occurred if, out of a first predetermined number (N1) of consecutive results of the output of the second comparator (403), there is at least a second predetermined number (X1) of results indicating that the difference signal is within the predetermined range of positive values. The transient detector comprises further features for similarly detecting a negative transient. The transient detector (701) is particularly good at dealing with measurement noise and light load induced noise.

    Abstract translation: 公开了一种包括反馈单元,电压前馈(VFF)补偿信号发生器(1211)和瞬态检测器(701)的开关模式电源(SMPS)。 当瞬态检测器(701)在SMPS的输入电压上检测到瞬态时,VFF补偿信号仅施加到反馈单元的输出,从而节省功率和计算时间。 瞬态检测器(701)包括第一比较器(402),用于检测在差信号大于正阈值电平Cb1Q时是否发生正瞬变; 第二比较器(403),用于确定差分信号是否在正值的预定范围内,并输出指示差信号是否在正值的预定范围内的结果; 以及第一计算器(405),用于检测是否产生正瞬态,如果在所述第二比较器(403)的输出的连续结果的第一预定数目(N1)中至少存在第二预定数(X1 )表示差信号在正值的预定范围内的结果。 瞬态检测器包括用于类似地检测负瞬变的另外的特征。 瞬态检测器(701)特别适用于处理测量噪声和轻载感应噪声。

    START UP PROCEDURE FOR AN ISOLATED SWITCHED MODE POWER SUPPLY

    公开(公告)号:IN3129DEN2014A

    公开(公告)日:2015-06-26

    申请号:IN3129DEN2014

    申请日:2014-04-21

    Abstract: An isolated switched mode power supply, SMPS, comprising: a switching controller (230) operable to generate startup switching control signals during start-up of the isolated SMPS (200), and operational switching control signals of period T during subsequent operation of the isolated SMPS (200); a transformer (110) having a primary winding (111); and a full-bridge drive circuit arranged to drive the primary winding (ill) of the transformer in response to the switching control signals. The full-bridge drive - circuit has: a first switching element (Q2); a boot-strap driving circuit (120) arranged to switch the first switching element (Q2) in response to the switching control signals, the boot-strap driving circuit having a boot-strap capacitor; and a second switching element (Q4) connected to the first switching element (Q2) and to the boot-strap driving circuit (120), and arranged to conduct a current to charge the boot-strap capacitor when switched ON in response to the switching control signals. The switching controller (230) is operable to start up the isolated SMPS by: determining a duty cycle D for the operational switching control signals based on a voltage (V t) at an output of the isolated SMPS; and generating the start-up switching control signals comprising a first voltage pulse of duration PI to temporarily switch ON the second switching element (Q4), and a subsequent second voltage pulse of duration P2 to temporarily switch ON the first switching element (Q2), wherein P1

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