High-efficiency single-inductor multi-output direct-current voltage converter

The invention discloses a high-efficiency single-inductor multi-output direct-current voltage converter, which is characterized in that a synchronous rectifier tube is bridged at two ends of an inductor of the direct-current voltage converter, and is controlled by a self-adaptive dead-time energy cycle control module to be switched on in dead-time of an output-stage power tube, and an inductor follow current loop in the dead-time is provided; the on-resistance of the synchronous rectifier tube is set to be extremely small, so that extra energy loss in the dead time is relatively small, and relatively large extra loss caused by relatively large current flowing through the upper power tube or the lower power tube in the dead time is avoided. Besides, aiming at the substrate bias problem of the output-stage power tube, the invention provides a substrate automatic bias module to reduce the threshold voltage of the output-stage power tube when the output-stage power tube is conducted, reduce the on-resistance and