【摘要】 利用TL494芯片控制开关稳压电源的导通和截止,通过控制输出的有效脉冲宽度变化,控制效率开关管导通时间及频率变化.实现主、次电源输出电压的稳定和最大带载功率200 W、节能30%,并具有开关稳压电源的过流与过压保护功能.更多还原

【Abstract】 PWM chip TL494 is used to control the breakover and cut-off of switching voltage-stabilized power supply.This changes the effective impulse width and influences the switch.The time and the frequency variation of effective switch tube are decided by controlling the change of the pulse-width modulation.The main and standby power supply is stabilized,and the maximum capability of driving load reach es 200W and saving 30 percent of energy is realized.The power supply with protection circuit of current and voltage is designed.更多还原