CAJ | 학술논문

对电流模式控制的反激变换电路进行了研究，建立了工作在电流断续模式下的反激电路小信号模型，给出了基于PWM控制芯片LD7670的单端反激电路的设计实例和电路分析。采用MathCAD对反激变换器控制环路的幅频特性和相频特性进行了分析，对控制环路进行了补偿网络设计，以提高系统的稳定性和瞬态响应。仿真和实验结果证明了模型的有效性，所设计的反激变换电路具有输入电压变化范围宽、动态响应快、电压调整率和负载调整率高的特点。
대전류모식공제적반격변환전로진행료연구，건립료공작재전류단속모식하적반격전로소신호모형，급출료기우PWM공제심편LD7670적단단반격전로적설계실례화전로분석。채용MathCAD대반격변환기공제배로적폭빈특성화상빈특성진행료분석，대공제배로진행료보상망락설계，이제고계통적은정성화순태향응。방진화실험결과증명료모형적유효성，소설계적반격변환전로구유수입전압변화범위관、동태향응쾌、전압조정솔화부재조정솔고적특점。
The current mode control ed flyback converter was studied. The smal signal model of flyback circuit operating in discontinuous current mode and current-mode control circuit were introduced. The design example and analysis of a flyback converter based on PWM control chip LD7670 were presented. Amplitude杅requency characteristic and phase-frequency characteristic were simulated by using MathCAD. The stability and dynamic response of switch-mode power supplies were elevated by optimizing its compensation network. The results of the analysis were simulated and verified through experiment. The results show that the flyback converter designed has a wide input voltage range, fast frequency response speed, high voltage and load regulation rates and stable output voltage.