Power supply circuit with pre-constant current start and fast recovery function and its working method

Abstract

The invention discloses a power supply circuit with pre-constant current start-up and fast recovery functions and its working method. The power supply circuit includes a main power switch, a constant current circuit, a power-off quick reset circuit, an enabling circuit, a delay circuit and a BUCK ‑DCDC module circuit, the output terminal of the main power switch is also connected with a capacitor C, and the other end of the capacitor C is grounded; the constant current circuit is connected in parallel with the main power switch; the input terminal of the power-off quick reset circuit is connected to the input terminal of the main power switch Electrically connected, the output terminal is electrically connected to the delay circuit; the enabling circuit is electrically connected to the main power switch and the BUCK‑DCDC module circuit; the delay circuit is electrically connected to the enabling circuit, and the delay control signal is output to the enabling circuit; BUCK‑ The DCDC module circuit is connected with the power consumption circuit of the subsequent stage, and is used for supplying power to the power consumption circuit of the subsequent stage. The invention can realize the linear increase of load start-up voltage, eliminate the influence of start-up surge current, has strong capacitive load capacity, fast power-off recovery speed, and strong load-carrying capacity.

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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