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

Claim 2:
3. The switching power supply of claim 1, wherein
the power compensation auxiliary circuit comprises a P-type semiconductor switch; the DC power supply circuit provides a second voltage and a first voltage to a current input terminal and a control terminal of the P-type semiconductor switch respectively; at least one of the second voltage and the first voltage is related to the current output voltage of the switching power supply;
when the output voltage of the switching power supply is not greater than the threshold voltage, the difference between the second voltage and the first voltage is greater than a breakover voltage between the current input terminal and the control terminal of the P-type semiconductor switch, the P-type semiconductor switch turns on, and the power compensation auxiliary circuit generates the DC voltage so as to provide the compensation voltage to the current detection terminal,
when the output voltage of the switching power supply is greater than the threshold voltage, the difference between the second voltage and the first voltage is less than the breakover voltage between the current input terminal and the control terminal of the P-type semiconductor switch, the P-type semiconductor switch turns off, and the power compensation auxiliary circuit does not generate the DC voltage thus does not provide the compensation voltage to the current detection terminal.