Overcurrent counter for soft start protection

Abstract

The invention belongs to the technical field of power supplies, and relates to an overcurrent counter for soft start protection. The overcurrent counter for soft start protection mainly comprises a clock frequency division module, a clock selection module, a timing module, a first logic processing module and a second logic processing module; the input end of the clock frequency division module is connected with an external clock signal, and the output end of the clock frequency division module is connected with the clock selection module; the input end of the clock selection module is connected with an external clock selection signal; the input end of the timing module is connected with an external overcurrent signal and an external soft start signal; the input end of the first logic processing module is connected with the external overcurrent signal, and the output end of the first logic processing module is connected with an overcurrent state protection signal; the input end of the second logic processing module is connected with the external soft start signal, and the output end of the second logic processing module is connected with a soft start monitor signal. The overcurrent counter for soft start protection has the advantages that the existing necessary modules are effectively utilized for the optimal design of system control; meanwhile, on the condition that a narrow-band pulse signal filtering circuit is additionally arranged, the anti-noise capacity of the system is improved, and false triggering caused by noise is effectively filtered out.

Description

technical field [0001] The invention belongs to the technical field of power supplies and relates to an overcurrent counter used for soft start protection. Background technique [0002] In the field of power management technology, system-level control is the guarantee of power system reliability. The purpose of soft start is to prevent damage to the system caused by phenomena such as surges during the power-on process. This process is the link between the power system starting and normal operation. The protection of the abnormal state is an important part to ensure the orderly work of the whole system. Overcurrent counting is a common protection form of the power management system for the abnormal state of overcurrent. Transient exceptions in turn guarantee the system's response to this state within a tolerance range. [0003] The system implementation in the form of counting protection in the overcurrent state is as follows figure 1 As shown, it includes counting module ...

AI Technical Summary

Problems solved by technology

[0004] The soft start process is a process in which the output voltage of the power system slowly rises to a stable state, which is of great significance to the reliable and stable operation of the system. At present, in many power systems, there is no relevant protection and protection for the soft start process. The state of the system is monitored, and the abnormality of the soft start will directly lead to the paralysis of the entire system. At the same time, because most of the protection control modules of the system do not enter the working state during the soft start process, the reliability of the system is discounted.

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