Serial flyback switch power supply with controlled total voltage and uncontrolled partial voltage

Abstract

The invention provides a serial flyback switch power supply with controlled total voltage and uncontrolled partial voltage, comprising a power supply circuit, a detection circuit, a control circuit and a flyback circuit, wherein the detection circuit generates two branches of voltage detection signals and outputs the voltage detection signals to an input terminal of the control circuit; the power supply circuit is respectively connected with the control circuit and the flyback circuit and used for outputting a working power supply; the control circuit generates two branches of starting signals and outputs the starting signals to the flyback circuit; and the flyback circuit outputs the needed direct current voltage. The serial flyback switch power supply can switch the high-voltage direct current and the low-voltage direct current; facing to the lower limit of 500V to the upper limit voltage of 1400V of the direct voltage, the transformation ratio is 1: 28; moreover, through monitoring the total input voltage, the overvoltage and low-voltage protection to the input voltage can be realized. The serial flyback switch power supply is suitable for the high-wide input voltage, and has the advantages of simple structure, and low cost, and is easy to control.

Description

technical field [0001] The invention relates to a device in the technical field of voltage switches, in particular to a series flyback switching power supply with controlled total voltage and uncontrolled voltage division. Background technique [0002] The high voltage level and wide variation range of application fields such as high-voltage variable frequency speed regulation, power instrument detection, and submarine cables make the switching power supply design ideas used in these fields must be changed accordingly. For general switching power supply design, its adaptable input voltage range is small, which cannot meet these special industrial applications. The input voltage range of the power system testing instrument power supply is AC 90-600V, the input voltage range of the submarine cable power supply is AC 1500-2000V, and the input voltage range of the industrial inverter power supply is AC 140-800V. Because these fields are relatively special, the research and desi...

AI Technical Summary

Problems solved by technology

However, for high and wide input voltages, single-stage flyback switching power supplies cannot withstand it. According to the input voltage level, two-stage or multi-stage flyback switching power supplies are required.

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