Auxiliary power supply over-current protection system suitable for wide-range voltage input

• Main Authors: FENG HONGFENG, YUAN QIYU
• Format: Patent
• Language: Chinese; English
• Published: 04.07.2023
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention discloses an auxiliary power supply over-current protection system suitable for wide-range voltage input, and the system comprises a negative bus resistor which is used for the detection of a bus current; the voltage dividing module is used for detecting bus voltage; and the control module is used for integrating the bus current value and the bus voltage value and determining an overcurrent protection threshold value. For an auxiliary power supply with wide-range voltage input, a fixed over-current protection threshold value often causes inaccurate over-current protection. The negative bus resistor and the voltage division module are arranged at the input end of the power electronic converter, and the over-current protection threshold value of the power electronic converter can be changed in real time by detecting the voltage and the current of the bus, so that over-current protection of the power electronic converter with wide-range voltage input is realized; the over-current protection circuit