| 摘要: |
| 在轻载模式下，传统过零检测电路会现“电流倒灌”现象，为了获得性能更优的开关电源变换器，设计了一种性能优异的低功耗同步BUCK芯片过零检测电路。首先通过电压门限采集和温度补偿提高放大电路的稳定性，大幅度降低“电流倒灌”现象出现的概率，然后采用边沿隐匿电路避免出现电路切换误触发操作，最后采用仿真实验对其性能进行测试与分析。结果表明，当温度处于-40~120℃间时，负阈值门限=0.1mV，提高了系统的检测精度，而且系统功耗非常低，具有较高的实际应用价值。 |
| 关键词: 轻载模式 BUCK芯片 检测电路 温度补偿 |
| DOI： |
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| 基金项目:河南省科技攻关计划项目 |
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| A zero-crossing detection circuit for BUCK chip |
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| Abstract: |
| Under the light load mode, traditional zero crossing detection circuit will produce "current backflow" phenomenon, in order to obtain better performance of switching power supply converter, a zero crossing detection circuit of low power synchronous buck chip is design in this paper. Firstly, threshold voltage acquisition and temperature compensation are used to improve amplification circuit stability, and greatly reduce probability of "current backflow" phenomenon, and secondly, edge occult circuit is used to avoid false triggering operation of switching circuit, lastly, the simulation experiments is carried out to test and analyze the performance. The results show that when the temperature is between -40 and~120℃, the negative threshold is 0.1mV, the proposed zero crossing detection circuit can improve the detection accuracy of system, and the system power consumption is very low, it has high practical value. |
| Key words: Light load mode BUCK chip detection circuit temperature compensation |