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    Control circuit for a switching transistor using a tapped coil with oppositely wound coil parts
    60.
    发明授权
    Control circuit for a switching transistor using a tapped coil with oppositely wound coil parts 失效
    使用具有相反绕线圈部分的抽头线圈的开关晶体管的控制电路

    公开(公告)号：US5892671A

    公开(公告)日：1999-04-06

    申请号：US783228

    申请日：1997-01-14

    申请人： Yves Fran.cedilla.ois ,  Daniel Lopez ,  Gerard Rilly

    发明人： Yves Fran.cedilla.ois ,  Daniel Lopez ,  Gerard Rilly

    IPC分类号： H04N3/18 ,  H02M3/28 ,  H03K4/62 ,  H03K17/64 ,  H02M7/537

    CPC分类号： H03K4/62

    摘要： A line deflection circuit for a television receiver or a switched-mode power supply operate with a switching transistor that is connected in series with the primary winding of a transformer and is periodically switched on and off by a switching voltage. In such a circuit, appreciable turn-on and turn-off losses, which reduce the overall efficiency of the circuit, are produced at the switching transistor, particularly at higher operating frequencies. Within a control circuit a DC voltage source is connected to the base of the switching transistor via a periodically actuated switch element and a coil having a core and a tap. The two parts of the coil are wound in opposite senses, and the tap is connected via a diode to ground or to the emitter of the switching transistor. The control circuit further includes a charge-reversal path via which, during a demagnetization phase of the coil, the energy stored in the coil in the form of a current is transferred in the form of a negative voltage to a capacitor that is coupled via a second diode to a first part of the coil. The negative voltage is applied during a residual time subsequent to the demagnetization phase as a reverse voltage to the base of the switching transistor.

    摘要翻译： 用于电视接收机或开关模式电源的线路偏转电路与与变压器的初级绕组串联连接并且通过开关电压周期性地接通和断开的开关晶体管操作。 在这种电路中，特别是在更高的工作频率下，在开关晶体管处产生了降低电路整体效率的明显的导通和关断损耗。 在控制电路中，直流电压源通过周期性致动的开关元件和具有芯和抽头的线圈连接到开关晶体管的基极。 线圈的两个部分以相反的方向缠绕，并且抽头通过二极管连接到开关晶体管的地或发射极。 控制电路还包括电荷反转路径，通过该电荷反转路径，在线圈的退磁阶段期间，以电流形式存储在线圈中的能量以负电压的形式传送到电容器，该电容器经由 第二二极管到线圈的第一部分。 在退磁阶段之后的剩余时间内施加负电压作为与开关晶体管的基极的反向电压。