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US07876077B2 Control circuit and control method of current mode control type DC-DC converter 有权
电流模式控制型DC-DC转换器的控制电路和控制方法

Control circuit and control method of current mode control type DC-DC converter
Abstract:
The invention presents a control circuit and a control method of DC-DC converter capable of suppressing subharmonic oscillation of coil current even if the on-duty is over 50%. An error amplified signal V1 is an output voltage of an error amplifier ERA1. An offset voltage unit Ve2 outputs a lower limit set voltage V2 obtained by subtracting offset voltage e2 from error amplified signal V1. A voltage comparator COMP2 compares lower limit set voltage V2 output from offset voltage Ve2, and output voltage signal VIL. When the voltage value of output voltage signal VIL is decreased to lower limit set voltage V2 (region E2), the output of voltage comparator COMP2 changes from low level to high level. As a result, main transistor FET1 is set in conductive state. On the other hand, when the voltage value of output voltage signal VIL reaches an error amplified signal V1 (region E1), main transistor FET1 is set in non-conductive state.
Abstract(Chinese):

本发明提出了即使占空比超过50％，也能够抑制线圈电流的次谐波振荡的DC-DC转换器的控制电路和控制方法。 误差放大信号V1是误差放大器ERA1的输出电压。 偏移电压单元Ve2输出通过从误差放大信号V1中减去偏移电压e2而获得的下限设定电压V2。 电压比较器COMP2比较从偏置电压Ve2输出的下限设定电压V2和输出电压信号VIL。 当输出电压信号VIL的电压值降低到下限设定电压V2（区域E2）时，电压比较器COMP2的输出从低电平变为高电平。 结果，主晶体管FET1被设置为导通状态。 另一方面，当输出电压信号VIL的电压值达到误差放大信号V1（区域E1）时，主晶体管FET1被设定为非导通状态。

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