Surge protection circuit

• Main Authors: LUO XUCHENG, HU JIANWEI, CHENG JIANTAO
• Format: Patent
• Language: Chinese; English
• Published: 07.05.2019
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The surge protection circuit comprises a surge detection circuit, an N-type switching tube M0, P-type switching tubes S1, S2,..., Sm and a control circuit, wherein the surge detection circuit is connected between a charging voltage input end VIN and the ground; the surge detection circuit is formed by connecting n diodes and a resistor R0 in series, and the n diodes comprise y zener diodes which are reversely connected in series and n-y diodes which are forwardly connected in series; a second pin of the M0 is grounded, a first pin of the M0 is connected with the VIN, and the R0 is connected between the second pin of the M0 and the driving pin; zj is connected between the second pin and the first pin of Sj, j = 1, 2,..., m, and n > m > = 1; and the control circuit detects the magnitude of the surge current IIN flowing through the M0, sets different thresholds to meet IN1 (IN2) (..., INm), and controls the S1, S2,..., Sj to be conducted if the IIN is greater than the IINj. Surge protection of the charging inter