Hiccup type protection circuits for DC power supply

Abstract

The invention provides two hiccup type protection circuits for a DC power supply, wherein the hiccup type protection circuits belong to the technical field of power supplies. The hiccup type protection circuits are suitable for overcurrent protection in a DC power supply. The existing protection circuit of the power supply product has many troubles or requires artificial restart, or a relatively long time lag exits in protection, thereby causing power supply damage, etc. The invention provides two new circuit designs. The circuit is a four-pole network. The input end of the four-pole network is connected with the anode and the cathode of the protected DC power supply, and the output end is connected with a load. The hiccup type protection circuit performs hiccup type protection on the protected DC power supply, wherein the hiccup type protection has advantages of high action speed, high speed in automatic recovery, adjustable protected time length, low effect by ambient temperature, low power consumption, simple circuit structure and low cost. Experiments prove a fact that the hiccup type protection circuits can totally overcome defects in the existing protection circuit of the power supply product.

Description

technical field [0001] The invention relates to two types of hiccup protection circuits for DC power supplies, belonging to the technical field of power supplies. It is suitable for overcurrent protection in DC power supplies, whether it is a DC power supply using switching power supply technology or power frequency transformer step-down technology. Background technique [0002] When the DC power supply is working, the load is aggravated or the output end is short-circuited due to load changes, careless use, etc., so that the output current is too large and damaged. Adding a protection circuit should be an important part of the design of the power supply. [0003] At present, there are roughly three protection modes for DC power supplies: cut-off type, current-limiting type, and overheating type. 1. Cut-off type: When the output of the DC power supply is overloaded or short-circuited, the power supply will be turned off and no longer supply power to the load. It requires a...

AI Technical Summary

Problems solved by technology

That is to say, it will not restore the power supply by itself, and needs to be manually restarted, which will cause inconvenience to the application

2. Current-limiting type: Set a maximum value of the output current. Once the load current reaches this maximum value, the current will no longer be increased, and the output voltage will drop, which will lead to an increase in the internal power consumption of the power supply. Larger, increased heat generation, lower energy efficiency and lower reliability

Its defect is that there is a large time lag in feeling the temperature change. It is likely that the temperature sensor is too late to produce a corresponding action, and the power supply has been damaged; or the automatic restart is delayed, which cannot meet the load requirements; and it is greatly affected by the ambient temperature.

[0004] The above three power protection modes have their own shortcomings, and they cannot adapt to some loads with special requirements, and cannot adapt to the needs of technological development. New power protection modes need to be developed

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