Patent ID: 8289071
Filing Date: 2012-10-16
Classification: H02M

Abstract:
1. A charge pump comprising: a switching circuit which is interposed among first and second output capacitors, a flying capacitor, and an input power supply; and a control unit which controls the switching circuit, wherein the charge pump is operated in an operation mode including a high-voltage outputting mode, a low-voltage outputting mode, and a relay mode, and the control unit controls the switching circuit so that: the control unit changes the operation mode of the charge pump by direct transition from the low-voltage outputting mode to the high-voltage outputting mode when a voltage raise command is given during a period when the operation mode of the charge pump is in the low-voltage outputting mode, and the control unit changes the operation mode of the charge pump by relay transition from the high-voltage outputting mode through the relay mode to the low-voltage outputting mode when a voltage lower command is given during a period when the operation mode of the charge pump is in the high-voltage outputting mode.