Switching power supply with controllable current limit

• Main Authors: FENG YUMING, WANG CONG, ZHANG LIANG, ZHANG YONGGUANG, XIE YUHUA, YIN HUIPING
• Format: Patent
• Language: Chinese; English
• Published: 27.03.2020
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention relates to a switching power supply with a controllable current limit, which is characterized in that the output end of an energy supply circuit is connected with the input end of a current detection circuit, and the current detection circuit is used for detecting the output current of the energy supply circuit; the output end of the current detection circuit is connected with the input end of the logic control circuit, the logic control circuit is connected with the grid electrode of the MOS tube, and the logic control circuit is used for receiving an output signal of the current detection circuit and controlling the MOS tube to be turned on or turned off according to the output signal of the current detection circuit; the source electrode of the MOS tube is grounded; the drain electrode of the MOS tube is connected with the output end of the energy supply circuit; circuit design simplicity, a mirror image MOS tube is not required to replace a detection resistor; the purpose of accurately detec