知搜-全球专利检索

  1. 登录
  2. 注册
发明公开
CN103219873A 二次侧同步整流控制电路及交换式转换器 有权

二次侧同步整流控制电路及交换式转换器
摘要：
一种二次侧同步整流控制电路，包括一反向放大器、一第一比较器与一驱动单元；其中，反向放大器具有一输入端，接收来自一同步整流晶体管的一汲源极电压信号，以输出一反向放大信号；第一比较器，接收反向放大信号与一第一参考电压，以输出一第一比较信号；驱动单元，接收第一比较信号，并依据第一比较信号产生一驱动信号控制同步整流晶体管的导通状态。本发明还提供一种包括上述二次侧同步整流控制电路交换式转换器。本发明将同步整流晶体管的汲源极电压经一反相放大器反相放大后，再连接一比较器产生驱动信号，可降低驱动信号关闭时间点的偏差，改善偏差过大所造成的缺陷。
摘要（英）：

A secondary side synchronous rectification control circuit comprises an inverting amplifier, a first comparator, and a driving unit, wherein the inverting amplifier is provided with an input end which receives a drain-source electrode voltage signal from a synchronous rectification transistor and outputs an inverting amplifying signal, the first comparator receives the inverting amplifying signal a first reference voltage and outputs a first comparison signal, and the driving uint receives the first comparison signal and generates a driving signal according the first comparison signal to control conducting states of the synchronous rectification transistor. The invention further discloses a switching type convertor with the secondary side synchronous rectification control circuit. According to the secondary side synchronous rectification control circuit and the switching type convertor, the drain-source electrode voltage signal of the synchronous rectification transistor is amplified through the inverting amplifier and is connected with the comparator to generate the driving signal, deviation of driving signal turn-off time points is reduced, and defect caused by serious deviation is reduced.

公开/授权文献
0/0