Current-limiting high-voltage startup circuit for switching power supply with ultra-wide input voltage range

The utility model provides a current-limiting high-voltage startup circuit for a switching power supply with an ultra-wide input voltage range. The current-limiting high-voltage startup circuit at least comprises a high-voltage startup circuit and a current-limiting circuit. The high-voltage startup circuit includes a fifth resistor, a fourth MOSFET, a seventh resistor and a fifth diode, wherein one end of the fifth resistor and the drain of the fourth MOSFET are connected with a direct-current high-voltage providing circuit to receive a direct-current high voltage; the gate of the fourth MOSFET is connected with the other end of the fifth resistor; one end of the seventh resistor is connected with the source of the fourth MOSFET; and the positive electrode of the fifth diode is connected with the other end of the seventh resistor, while the negative electrode of the fifth diode is connected to a secondary winding circuit. The current-limiting circuit includes a third triode, a sixth resistor and the seventh