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发明授权
CN108242888B 一种开环电荷泵 有权

一种开环电荷泵
摘要：
本发明公开了一种开环电荷泵，所述开环电荷泵在所述控制电路与所述升压电路之间设置有峰值限流控制电路，通过所述控制电路基于所述过压保护信号，驱动所述峰值限流控制电路，通过所述峰值限流控制电路控制所述升压电路处于充电相位或是放电相位。当所述输出电压大于上限阈值电压时，所述升压电路持续处于所述充电相位，停止向所述输出负载供电，通过所述输出电容放电为所述输出负载供电；当所述输出电压小于下限阈值电压时，所述升压电路处于所述正常工作模式。这样，可以避免由于所述电荷泵的输出电压的纹波频率位于音频范围内而导致的音乐杂音问题，提高了音质。
摘要（英）：

An open-loop charge pump is provided. In the open-loop charge pump, a peak current limiting control circuit is arranged between a control circuit and a boost circuit. The control circuit drives the peak current limiting control circuit based on an over-voltage protection signal to control the boost circuit to be in a charging phase continuously or in a normal operation mode. In a case that the output voltage is higher than an upper threshold voltage, the boost circuit is continuously in the charging phase and does not supply power to an output load, and an output capacitor is discharged to supply power to the output load. In a case that the output voltage is lower than a lower threshold voltage, the boost circuit is in the normal operation mode.

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