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    • 65. 发明授权
    • DC-DC converter
    • DC-DC转换器
    • US06998825B2
    • 2006-02-14
    • US10985882
    • 2004-11-12
    • Kazuhiko NagaokaSatoshi WadaTsukasa Kawahara
    • Kazuhiko NagaokaSatoshi WadaTsukasa Kawahara
    • G05F1/652
    • H02M3/158H02J2001/008H02M2001/009
    • An inductor 6 accumulates an energy therein or releases the accumulated energy according to the state of a main switch element 10 being turned ON/OFF. When the inductor 6 releases an energy, if a sub-switch element 12 is in the ON state, a current is passed through a circuit downstream of the sub-switch element 12, thereby increasing an output voltage VO1. The sub-switch element 12 is a P-channel MOS transistor, and a sub-switch control circuit 18 outputs a control signal VCT1 for the sub-switch element 12. A level shift circuit 19 receives an output-side potential VP of the inductor 6, and outputs, as a control signal VG1 applied to the gate of the sub-switch element 12, the potential VP if the control signal VCT1 is at the L level or a potential (VP−VM) lower than the potential VP if the control signal VCT1 is at the H level. Thus, the output voltage of the DC-DC converter can be made precisely equal to the target voltage.
    • 电感器6在其中累积能量,或者根据主开关元件10被接通/断开的状态释放累积的能量。 当电感器6释放能量时,如果副开关元件12处于导通状态,则电流通过副开关元件12下游的电路,从而增加输出电压VO 1。 副开关元件12是P沟道MOS晶体管,副开关控制电路18输出副开关元件12的控制信号VCT1。 电平移位电路19接收电感器6的输出侧电位VP,并且如果控制信号VCT 1处于电平位置,则作为施加到副开关元件12的栅极的控制信号VG1输出电位VP L电平或电位(VP-VM)低于电位VP,如果控制信号VCT 1处于H电平。 因此,可以使DC-DC转换器的输出电压精确地等于目标电压。