Power circuit having multiple stages of charge pumps

摘要

The present invention discloses a power circuit having multiple stages of charge pumps. The power circuit comprises a first charge pump, a second charge pump, a voltage stabilizing capacitor, and an output capacitor. The first charge pump adjusts an input voltage and produces a first output voltage. The second charge pump adjusts the first output voltage, produces a second output voltage, and outputs the second output voltage for driving a loading. The voltage stabilizing capacitor is coupled between the first and second charge pumps and connected externally to the output of the first charge pump. The output capacitor is coupled to the second charge pump for providing the second output voltage. According to the present invention, the effect of supplying large transient currents to the loading can be achieved by connecting externally the voltage stabilizing capacitor to the output of the first charge pump.

主权项

1. A power circuit having multiple stages of charge pumps, comprising:
a first charge pump, producing a first output voltage according to an input voltage; a second charge pump, producing a second output voltage according to said first output voltage, and outputting said second output voltage for driving a loading; a voltage stabilizing capacitor, coupled between said first charge pump and said second charge pump, and connected externally to an output of said first charge pump; and an output capacitor, coupled to said second charge pump for outputting said second output voltage;where when said loading becomes heavy, the charges output by said voltage stabilizing capacitor increase.