Current limiting protection device

• Main Authors: FAN BISHUANG, MENG QINGHUI, LIU ZHILONG
• Format: Patent
• Language: Chinese; English
• Published: 21.07.2017
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention discloses a current limiting protection device. The S electrode and the D electrode of a PMOS transistor of the current limiting protection device are connected in series with a load branch; a current detection circuit is connected with the sampling resistor and the overcurrent comparison circuit on the load circuit; the output end of the overcurrent comparison circuit is connected with a logical circuit, and the logical circuit is connected with a trigger delay circuit; and the output end of the trigger delay circuit is connected with the G electrode of the PMOS transistor. When the output voltage of the current detection circuit is less than the reference voltage of the overcurrent comparison circuit, the overcurrent comparison circuit outputs high level and the logical circuit outputs low level; the trigger delay circuit outputs low level to drive the PMOS transistor to be conducted and maintained; when the output voltage is greater than the reference voltage of the overcurrent comparison cir