Filtering current-limiting composite circuit and ac / dc power supply

Abstract

The utility model discloses a filter current -limiting composite circuit and AC / DC power supply. The filter current -limiting composite circuit is used for carrying out high frequency filtering to the high frequency current of AC / DC power supply working process generation, is also used for carrying out the current -limiting of short -circuit current of the short circuit of AC / DC power supply inside generation. The utility model discloses through increasing filter current -limiting composite circuit between the load end negative pole of AC / DC power supply and PE line, filter current -limiting composite circuit can carry out high frequency filtering to the output of AC / DC power supply, blocks high frequency current and flows to the load, and then protects the load, filter current -limiting composite circuit can also conduct when the short circuit of AC / DC power supply inside generation, makes short -circuit current can flow to the ground through filter current -limiting composite circuit and carries out the current -limiting of short -circuit current, can realize the short -circuit current limitation in power supply inside, avoids short -circuit current and flows to the load and leads to the load damage, thereby avoids the fault magnification.

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