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设计并实现了一种高功率因数AC-DC LED驱动电路。采用单周期控制策略与固定关断时间控制方式,得到了接近于1的功率因数。针对系统工作在断续导通模式下所产生的输入电流零交越畸变现象,加入了零交越补偿电路,并对改进的电路进行系统建模。使用Simplis软件验证了该策略的可行性,并对补偿电路进行了参数优化与选取。采用HHNEC 0.5μm 5V/40V HVCMOS工艺对芯片进行MOS级电路设计,控制芯片版图尺寸为1 950μm×2 730μm。对原型电路进行测试,交流输入电压在85~265V范围内,输出功率在7~12 W时,整个系统功率因数高于0.98,最高可达0.9992,总谐波失真最小仅为4.67%。
A high power factor AC-DC LED driver circuit is designed and implemented. Single-cycle control strategy and fixed off-time control mode, the power factor close to 1 was obtained. Aiming at zero cross over distortion caused by the system working in discontinuous conduction mode, a zero crossing compensation circuit is added and the improved circuit is modeled systematically. The Simplis software is used to verify the feasibility of the strategy, and the parameters of the compensation circuit are optimized and selected. MOS HONIC circuit design using HHNEC 0.5μm 5V / 40V HVCMOS process, the control chip layout size of 1 950μm × 2 730μm. The prototype circuit is tested. When the AC input voltage is in the range of 85 ~ 265V and the output power is 7 ~ 12W, the power factor of the whole system is higher than 0.98 and the maximum is 0.9992. The total harmonic distortion is only a minimum of 4.67%.