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1. 发明专利

JP2014050278A Switching power supply device 有权
标题翻译：切换电源设备
公开(公告)号：JP2014050278A
公开(公告)日：2014-03-17
申请号：JP2012193183
申请日：2012-09-03
申请人： Cosel Co Ltd , コーセル株式会社
发明人： KAWATAKA NOBUTO
IPC分类号： H02M3/28
摘要： PROBLEM TO BE SOLVED: To provide a switching power supply device that stably controls turning on/off of a main switching element by reducing the effect of delay of a PWM comparator and performing ideal pulse width modulation.SOLUTION: A switching control circuit 38 for controlling turning on/off of a main switching element 12 includes an error amplification circuit 40 for outputting an error amplification voltage Ver, a ramp wave generation circuit 42 for outputting a ramp wave voltage Vram, a PWM comparator 22 and a PWM auxiliary circuit 44. The error amplification circuit 40, the ramp wave generation circuit 42 and the PWM auxiliary circuit 44 output the error amplification voltage Ver, the ramp wave voltage Vram and a predetermined drive voltage Vdr, respectively. The PWM comparator 22 compares the error amplification voltage Ver on which the drive voltage Vdr is superimposed with the ramp wave voltage Vram. At the timing when the difference between the voltages of a pair of input terminals of the PWM comparator 22 decreases, the drive voltage Vdr instantaneously inverts the magnitude relationship between the voltages of the input terminals.
摘要翻译：要解决的问题：提供一种开关电源装置，其通过减少PWM比较器的延迟的影响并且执行理想的脉宽调制来稳定地控制主开关元件的导通/截止。解决方案：用于控制的开关控制电路38 主开关元件12的接通/断开包括用于输出误差放大电压Ver的误差放大电路40，用于输出斜坡波电压Vram的斜波生成电路42，PWM比较器22和PWM辅助电路44。误差放大电路40，斜波发生电路42和PWM辅助电路44分别输出误差放大电压Ver，斜波电压Vram和预定的驱动电压Vdr。 PWM比较器22将驱动电压Vdr上叠加的误差放大电压Ver与斜波电压Vram进行比较。在PWM比较器22的一对输入端子的电压差减小的定时，驱动电压Vdr瞬时反转输入端子的电压之间的大小关系。

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