Patent ID: 8660276
Filing Date: 2014-02-25
Classification: H04R

Abstract:
1. A driving circuit for a sound outputting apparatus, comprising: first and second switches connected via a first switch node and in series between a first voltage input terminal and a second voltage input terminal; third and fourth switches connected via a second switch node and in series between a third voltage input terminal and a fourth voltage input terminal, such that the first to fourth switch are configured as an H-bridge when the driving circuit is in a first mode; fifth and sixth switches connected via a third switch node and in series between a voltage output terminal and a fifth voltage input terminal; and a flying capacitor connected between the first switch node and the third switch node, such that the first, second, fifth and sixth switches and the flying capacitor are configured as a charge pump when the driving circuit is in a second mode; wherein in the first mode, the fifth and sixth switches remain open circuit, and the H-bridge generates a first voltage between the first and second switch nodes for driving a first type loudspeaker, and in the second mode, the third and fourth switches remain open circuit, and the charge pump generates a second voltage at the voltage output terminal for driving a second type loudspeaker.