Patent ID: 8581646
Filing Date: 2013-11-12
Classification: H02M

Abstract:
1. A charge pump circuit, comprising a switching circuit for providing a charge and discharge current, a control circuit for controlling said switching circuit, a third capacitor and a fourth capacitor, wherein said switching circuit comprises a first switch for controlling a charging speed; wherein said control circuit generates a first signal for controlling said first switch based on a pulse width of an input signal, said first switch is closed when said first signal is low-level and said first switch is open when said first signal is high-level; and wherein said control circuit comprises an OR gate and a second buffer connected with said OR gate, wherein two input ends of said OR gate respectively receive two input signals, an output end of said OR gate is connected with ground through said third capacitor, said output end of said OR gate is connected with an input end of said second buffer, an output end of said second buffer is connected with ground through said fourth capacitor, said output end of said OR gate outputs said first signal for controlling said first switch.