Voltage regulator for supplying power to internal circuits

A regulator for supplying the power of internal circuits, which makes the power of internal circuits independent of the voltage of the outlet power supply by using multi-stage method to control the power supplied from the outlet power source, and avoids the dropping of voltage to affect the system operation. The voltage is able to return to the normal voltage level quickly by increasing the voltage level of the internal circuits in advance, and make the voltage of the internal power supply reduce the variation when output and return to normal voltage level quickly when charge by dynamic adjusting the loading in the regulator.