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脉冲序列控制(PT)是一种离散的非线性开关变换器控制方法, 具有瞬态响应快、无需补偿网络、控制电路实现简单等优点. 根据控制脉冲的产生方式不同, 脉冲序列控制可分为电压型脉冲序列控制(voltage-mode PT, VM-PT)和电流型脉冲序列控制(current-mode PT, CM-PT). 研究表明, 工作于电感电流连续导电模式(continuous conduction mode, CCM)与工作于电感电流断续导电模式(discontinuous conduction mode)的VM-PT控制开关变换器的工作特性存在明显差别, VM-PT控制CCM开关变换器存在的低频振荡现象严重影响了其稳态及瞬态性能. 目前, 对CM-PT控制CCM开关变换器的工作特性还未见相关报道. 本文研究了CM-PT控制CCM开关变换器的工作特性, 对其控制参数以及稳定工作域进行了分析. 分析结果表明, 通过参数的合理设计, 虽然可以避免低频振荡现象的发生以及开关管不能正常关断的问题, 但存在变换器功率范围窄的缺点. 最后针对这一缺点提出了一种改进的控制方法.
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关键词:
- 电流型/
- 脉冲序列控制/
- 电感电流连续导电模式
Pulse train (PT) control technique is a discrete, nonlinear control technique for switching converter which benefits from simple design and ultra fast transient response. As an output-power-control-based control technique, a low-frequency oscillation phenomenon occurs in voltage-mode PT controlled switching converter operating in continuous conduction mode. This phenomenon will seriously affect the steady and transient performances of switching converter. In this paper, a current-mode PT (CM-PT) controlled switching converter is studied. The normally working region is studied and the parameter conditions are estimated. Targeting the problem of CM-PT control technique, a modified control technique is proposed.-
Keywords:
- current-mode/
- pulse train/
- continuous conduction mode
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