FLOATING-GROUND VOLTAGE STABILIZATION POWER SUPPLY CIRCUIT

摘要

A floating-ground voltage stabilization power supply circuit, wherein same is applied between two boost pins of a four-switch Buck-Boost converter, and same can solve the problem of no power supply for a tube driving circuit in a Buck mode and a Boost mode of the four-switch Buck-Boost converter. In the present invention, an output voltage is higher than an input voltage in the Boost mode, and as such, a bootstrap voltage of a Boost circuit can easily charge a bootstrap capacitor of a Buck circuit through the floating-ground voltage stabilization power supply circuit; and when in the Buck mode, a bootstrap voltage of the Buck circuit can easily charge a bootstrap capacitor of the Boost circuit through the floating-ground voltage stabilization power supply circuit, thereby realizing the function of continuously turning on and supplying power to a switch tube in the converter. The present invention is low in cost, has a simple circuit, has a low amount of loss, is easy to realize and can easily be used for IC integration, and also avoids all the disadvantages brought about by traditional solutions.