Low-voltage high-current multi-phase parallel DC/DC power supply protection circuit

Abstract

The invention discloses a low-voltage high-current multi-phase parallel DC / DC power supply protection circuit, which comprises a control chip and N phases of sub-circuits arranged in parallel. Each phase of sub-circuit comprises a protection circuit and a power conversion circuit which are connected in series; a fuse and a fault detection circuit are arranged in the protection circuit; the fault detection circuit is used for detecting the voltage V at the two ends of the fuse, comparing the voltage V with a rated lower limit voltage value V0, and outputting a fault alarm signal when the voltage V is smaller than the rated lower limit voltage value V0; and the control chip is used for receiving the fault alarm signal sent by any fault detection circuit and outputting a circuit disconnectionsignal to all the power conversion circuits so as to control all the power conversion circuits to be disconnected. Through the multi-phase linkage DC / DC power supply protection circuit, the overall safety of the multi-phase VRM power supply can be ensured, and the reliability of the multi-phase VRM is effectively improved.

Description

technical field [0001] The invention relates to the field of multi-phase parallel DC / DC circuits, in particular to a low-voltage and high-current multi-phase parallel DC / DC power supply protection circuit. Background technique [0002] With the development of semiconductor technology, the core power consumption of processors continues to increase, the power supply voltage continues to drop, and the core current increases. This poses a severe challenge to the design of power supply for high-power processor cores. At present, the industry generally adopts a multi-phase interleaved parallel DC / DC circuit to design a processor core power supply circuit. Multi-phase DC / DC conversion circuits work in parallel, which can effectively offset the current ripple and improve the output current capability. But at the same time, the multi-phase parallel DC / DC power supply also poses challenges to the power input protection design. On the one hand, if the overall input protection circuit...

AI Technical Summary

Problems solved by technology

On the one hand, if the overall input protection circuit is used, due to the large input power, the overcurrent protection threshold will be too high, and the fault protection will not be timely; on the other hand, if the protection circuit is set separately for each phase, when one of the During phase fault protection, other phases are still in normal working state, which will cause current backflow problem, and normal fault protection cannot be realized

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