Direct current protection circuit and protection method thereof

Abstract

The invention relates to a direct current protection circuit and a protection method thereof. The direct current protection circuit comprises a circuit monitoring system and a switching circuit; the circuit monitoring system comprises a monitoring module, a time-delay circuit and a power supply circuit for supplying working power supply for the monitoring module; the switching circuit comprises a load and a switching tube connected with the load for protecting the load from being damaged in a short-circuit or over-load state; the drain of the switching tube is connected with the input end of the monitoring module; and the input end of the time-delay circuit is connected with the output end of the monitoring module while the output end is connected with the gate of the switching tube. The direct current protection circuit and the protection method thereof provided by the invention have high stability, low cost and high cost performance as well as quite high popularization and practical application values; and two solutions and different time-delay protection mechanism are adopted for short circuit and overload conditions, and slow on-off of the switching tube is controlled through the time-delay circuit, so that frequent switching and restart of electronic equipment can be avoided, and after fault removal, re-power-on of a protection module is not needed.

Description

technical field [0001] The invention relates to a protection circuit, in particular to a direct current protection circuit and a protection method thereof. Background technique [0002] If the current at the output of the power supply has exceeded the design's rated requirements, then the power supply is in an overload state. The phenomenon is that the current is too large, the electrical equipment heats up, and the long-term overload of the line will reduce the insulation level of the line, or even burn the equipment or line; there are many reasons, such as overloading of the electrical equipment, short circuit of the line, damage to the insulation of the equipment, etc., such as motor Blockage occurs, the crane does not move, etc. [0003] Component damage, weather conditions or man-made damage may cause short circuits. Due to the small resistance of the wire, the current in the circuit will be very large when the power supply is shorted. Such a large current is very li...

AI Technical Summary

Problems solved by technology

Under the above circumstances, if the machine can overcome the overload and resume normal operation in a short period of time, then there is no need to regard the motor stall as a short circuit and directly disconnect the circuit to interrupt the operation of the machine.

Secondly, the prior art does not propose protective measures for the voltage comparator or the power monitoring module after the circuit fails. In addition, after the system fault is eliminated, the protection circuit needs to be powered on again to return to normal, and the protection circuit needs to be powered on and restarted.

Images