CAJ | 학술논문

反激变换器是 LED 驱动的常用拓扑,为了降低成本,减小光耦对于 LED 电源可靠性的影响,提高系统的控制性能,同时避免线性控制方式在启动时的输出过冲造成 LED 损坏,提出了一种通过控制原边电流间接控制输出恒流的非线性控制策略.根据无源性控制理论建立了反激变换器的欧拉?拉格朗日模型,验证了系统的无源性,获得反激变换器原副边电流关系,然后基于无源性理论和 Layapunov 稳定性理论,推导出系统的无源性控制规律.这里所提出的控制方法结构简单,成本低,可靠性高,控制性能良好.实验结果验证了该控制方法的正确性,采用原边非线性电流控制方法的反激变换器具有稳定的输出电流,恒流精度高,启动无过冲并且具有良好的动态响应.
반격변환기시 LED 구동적상용탁복,위료강저성본,감소광우대우 LED 전원가고성적영향,제고계통적공제성능,동시피면선성공제방식재계동시적수출과충조성 LED 손배,제출료일충통과공제원변전류간접공제수출항류적비선성공제책략.근거무원성공제이론건립료반격변환기적구랍?랍격랑일모형,험증료계통적무원성,획득반격변환기원부변전류관계,연후기우무원성이론화 Layapunov 은정성이론,추도출계통적무원성공제규률.저리소제출적공제방법결구간단,성본저,가고성고,공제성능량호.실험결과험증료해공제방법적정학성,채용원변비선성전류공제방법적반격변환기구유은정적수출전류,항류정도고,계동무과충병차구유량호적동태향응.
Flyback converter is the common topology for LED driver. In order to reduce costs,reduce the influence of opti?calcoupler on the reliability of LED power supply,improve the control property of the system and avoid the LED damage caused by output overshoot when the linear control mode is started,a nonlinear control strategy which can indirectly control output con?stant current by controlling the primary current is proposed. Euler?Lagrange model of the flyback converter was established to ver?ify the passivity of the system based on passivity?based control theory,the relationship between the primary current and output current was obtained,and then the passivity?based control rule was deduced base on passivity theory and Layapunov stability theory. The control method proposed in this paper has advantages of simple controller structure,low cost,high reliability and good control performance. The validity of the control scheme was verified by test result. The flyback converter controlled by pri?mary nonlinear current control method has a stable output,high precision and exellent transient response,and no overshoot when startup as well.