Patent ID: 11955893
Assignee: SHENZHEN HUNTKEY ELECTRIC CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. The switching power supply of claim 6, wherein
the second DC power supply circuit comprises a third resistor, an N-channel MOS (metal oxide semiconductor) transistor, a first voltage stabilizing diode and a capacitor; the first DC power supply circuit comprises a second voltage stabilizing diode;
the second auxiliary voltage is grounded through the third resistor and the first voltage stabilizing diode, and the anode of the first voltage stabilizing diode is grounded;
the drain, gate and source of the N-channel MOS transistor are respectively connected to the second auxiliary voltage, the cathode of the first voltage stabilizing diode and the emitter of the PNP triode, wherein the emitter of the PNP triode outputs the second voltage;
the first auxiliary voltage is connected to the base of the PNP triode through the second voltage stabilizing diode, and the anode of the second voltage stabilizing diode is connected to the first auxiliary voltage, and the voltage at the base of the PNP triode is the first voltage.