CAJ | 학술논문

电流模式的单端反激式开关电源输出电压恒定时，其允许的最大输出电流都不能任意设定，针对电源在一些场合下应用不便问题，提出改进电流反馈控制电路的方法。电流取样电阻换用阻值非常小的电阻，电流取样信号不是直接送至集成控制器而是经过运算放大器放大后再送至集成控制器，改变运放的放大倍数就可在大范围内任意设定其允许的最大输出电流。实验结果表明，采用该方法后电源允许的最大输出电流可任意设定，成本增加极小，电源工作稳定，提高了电源的通用性。
전류모식적단단반격식개관전원수출전압항정시，기윤허적최대수출전류도불능임의설정，침대전원재일사장합하응용불편문제，제출개진전류반궤공제전로적방법。전류취양전조환용조치비상소적전조，전류취양신호불시직접송지집성공제기이시경과운산방대기방대후재송지집성공제기，개변운방적방대배수취가재대범위내임의설정기윤허적최대수출전류。실험결과표명，채용해방법후전원윤허적최대수출전류가임의설정，성본증가겁소，전원공작은정，제고료전원적통용성。
Currently,as single-ended current-mode flyback switching power supply output voltage is constant, the maximum output current can not be set arbitrarily.Thus in some situations such power applications are inconvenient. To addressthis problem,this paper improves current feedback control circuit.Current sampling resistor using a very small resistance,current sampling signal is first sent to the operational amplifier, amplified and then sent to the integrated controller.Changing the magnification of the op amp can arbitrarily set the maximum output current in a large range.Experimental results show that this method can arbitrarily set the maximum output current with minimal increase in cost.Power supply is stable and more efficient.