High-dropout voltage high-power DC-DC switch power supply for industrial and mining electrical locomotive

Abstract

The invention discloses a high-dropout voltage high-power DC-DC switch power supply for an industrial and mining electrical locomotive, and relates to switch power supply application technology. One path of input signals of the power supply pass through an input filter 1, a main circuit 2, a switching transformer 3, an output rectifier 4 and an output filter 5 to reach a load for power supply; the other path of input signals enter an auxiliary power supply 6 to provide working power supply for a driving circuit 7 and a PWM control circuit 9; a current protector 8 acquires current signals from the switching transformer 3, an overvoltage protector 10 and a voltage feedback 11 acquire voltage signals on the rear of the output rectifier 4, and the current signals and the voltage signals are together input into the PWM control circuit 9; the PWM control circuit 9 generates a pulse width modulation waveforms according to the fed back voltage and current to control the driving circuit 7; the driving circuit 7 sends PWM signals to the main circuit 2; and a soft start circuit 12 controls the soft start of the PWM control circuit 9 to implement. According to the working characteristics of the DC-DC switch power supply for the industrial and mining electrical locomotive, the high-dropout voltage high-power DC-DC switch power supply works stably for a long term under the environments such as large voltage fluctuation, high dust concentration, large relative humidity, strong electromagnetic interference, strenuous vibration and the like.

Description

technical field [0001] The invention relates to the application technology of switching power supply, which is a DC-DC switching power supply with high voltage difference and high power for industrial and mining electric locomotives. Background technique [0002] The switching power supply used in the industrial and mining electric locomotive mainly provides DC24V power supply for the on-board lighting system, air compressor, control system, solenoid valve, etc. Since the mine power supply voltage is DC 550V, and the mine power supply voltage fluctuation has greatly exceeded the general power supply. In addition, industrial and mining electric locomotives work in harsh environments such as tunnels and coal mines with high dust concentration, high relative humidity (greater than 95%), strong electromagnetic interference, and severe vibrations. The design, manufacture and application of the regulated power supply bring great difficulties. At present, the service life of this ...

AI Technical Summary

Problems solved by technology

[0002] The switching power supply used in industrial and mining electric locomotives mainly provides DC24V power supply for the on-board lighting system, air compressor, control system, solenoid valve, etc. Since the mine power supply voltage is DC 550V, and the mine power supply voltage fluctuation has greatly exceeded the general power supply. In addition, industrial and mining electric locomotives work in harsh environments such as tunnels and coal mines with high dust concentration, high relative humidity (greater than 95%), strong electromagnetic interference, and severe vibrations. The design, manufacture and application of regulated power supply bring great difficulties

The service life of this product currently in use on site does not exceed 3 months, which has brought great waste to the enterprise and increased the economic burden of the enterprise

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