用于峰值电流模Boost变换器的瞬态响应优化电路

A Transient Response Optimization Circuit Applied in Peak-Current Mode Boost Converter

为了提高瞬态响应速度,提出了一种用于峰值电流模PWM控制Boost变换器的瞬态响应优化电路。传统峰值电流模Boost变换器的带宽因受限于右半平面零点而限制了负载阶跃时的瞬态响应速度。该优化电路根据输出电压信号来输出自适应瞬态增强电流信号,优化了变换器的瞬态响应特性。采用0.18μm BCD工艺对电路进行仿真验证。结果表明,负载电流从1 A变化到200 mA时,负载阶跃恢复时间从65μs减小到50μs;负载电流从200 mA变化到1 A时,负载阶跃恢复时间从46μs减小到33μs。

A transient response optimization circuit applied in peak-current mode PWM boost converter was proposed, which could improve the transient response speed. The bandwidth of the traditional peak-current mode boost converter was limited by the zero point of right half plane, which limited the transient response speed during the load step. The optimized circuit could output the adaptive transient enhanced current signal according to the output voltage signal, thus optimizing the transient response characteristics of the converter. The proposed circuit was simulated and verified in a 0.18 μm BCD process. The results showed that the load step recovery time was reduced from 65 μs to 50 μs while the load current changed from 1 A to 200 mA, and the load step recovery time was reduced from 46 μs to 33 μs while the load current changed from 200 mA to 1 A.