Power supply circuit with pre-constant-current starting and fast recovery functions, and working method thereof

Abstract

The invention discloses a power supply circuit with pre-constant-current starting and fast recovery functions, and a working method thereof. The power supply circuit comprises a main power supply switch, a constant-current circuit, a power-off fast reset circuit, an enable circuit, a time delay circuit and a BUCK-DCDC module circuit, the output end of the main power supply switch is also connectedwith a capacitor C, and the other end of the capacitor C is grounded; the constant-current circuit is connected with the main power switch in parallel; the input end of the power-off quick reset circuit is electrically connected with the input end of the main power switch, and the output end is electrically connected with the time-delay circuit; the enable circuit is electrically connected with the main power switch and the BUCK-DCDC module circuit; the time-delay circuit is electrically connected with the enable circuit and outputs a time-delay control signal to the enable circuit; and the BUCK-DCDC module circuit is connected with a post-stage power utilization circuit and is used for supplying power to the post-stage power utilization circuit. According to the invention, the linear increase of the load starting voltage can be realized, the influence of the starting surge current is eliminated, the capacitive load capacity is strong, the outage recovery speed is high, and the load capacity is strong.

Description

technical field [0001] The invention relates to the technical field of electronic equipment, in particular to a power supply circuit with pre-constant current startup and fast recovery functions and a working method thereof. Background technique [0002] The coal industry is a very important basic industry in my country. The construction of high-yield, efficient, and safe modern mine technology cannot do without high-reliability power supply technology. In the special coal mining industry, intrinsically safe explosion-proof technology has emerged as the times require. [0003] Intrinsically safe explosion-proof technology is one of the most widely used technologies in the world today. It is widely used in mining, chemical industry, metallurgy, petroleum and other fields. In order to ensure the safety of personnel and equipment, explosion-proof technology is becoming more and more important, forming a series of industries , national and international standards, and deepen wi...

AI Technical Summary

Problems solved by technology

Based on the characteristics of the intrinsically safe power supply, the non-linear load capacity is poor, resulting in a weak overall load capacity of the power supply. At the same time, in order to eliminate the start-up surge current, the power supply part of the intrinsically safe equipment basically has a slow-start circuit, but at present, the slow-start circuit mostly relies on The threshold voltage of the MOS tube is delayed start, and the threshold voltage range of the MOS tube is large, and the temperature characteristics are not good, resulting in a large difference in slow start, which cannot solve practical problems well.

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