CAJ | 학술논문

针对当今LED线性稳压源功耗高、体积大的不足,利用LM2575 DC/DC降压芯片设计了一种恒流驱动大功率LED的PWM开关电源.其发光效率在80%以上,且体积小、性能稳定、成本低,通过调节外部电位器可以改变驱动电流进而改变LED的发光强度.
침대당금LED선성은압원공모고、체적대적불족,이용LM2575 DC/DC강압심편설계료일충항류구동대공솔LED적PWM개관전원.기발광효솔재80%이상,차체적소、성능은정、성본저,통과조절외부전위기가이개변구동전류진이개변LED적발광강도.
Due to the disadvantages of the current linear regulated power supply for LED which has high power consumption and large volume, a PWM (pulse width modulation) switch power supply based on LM2575 DC/DC step-down chip has been designed with the characteristics of luminous efficiency of above 80%, small volume, steady performance, low cost. It is used to drive powerful LED by constant current which can be adjusted by regulating external potentiometer, and the light intensity of LED is also changeable.