Power supply converter with controllable current peak inhibition protection

Abstract

The invention discloses a power supply converter with controllable current peak inhibition protection. According to the invention, a direct current input signal successively passes through an input filter circuit, a main power circuit and an output filter circuit and then the direct current input signal is output; after a voltage stabilizing circuit samples a direct current output signal, an output sampling signal carries out negative feedback control on a main switch tube in the main power circuit through a driving control circuit; a soft start circuit is arranged to connect between the input filter circuit and the driving control circuit; and an output short circuit protection circuit is arranged to connect a negative feedback winding of a transformer in the main power circuit and the driving control circuit. Besides, a current peak inhibition protection circuit is also arranged; an output terminal of the current peak inhibition protection circuit is connected to a joint between the voltage stabilizing circuit and the driving control circuit; and when the power supply converter is started, the current peak inhibition protection circuit outputs a monopulse signal that is used for replacing the voltage stabilizing circuit to work, wherein the amplitude and the time of the monopulse signal are controllable; and after the power supply converter works normally, the current peak inhibition protection circuit acts as being in a disconnection state.

Description

technical field [0001] The invention relates to a DC-DC low-power power converter, in particular to a DC-DC power converter with controllable current peak suppression protection. Background technique [0002] In the field of switching power supplies, the market pays more and more attention to whether the power supply products meet the safety standards, and the current limiting protection and sensitivity of the output of the power supply system is a very important indicator in the safety standards. Correspondingly, its requirements It is getting higher and higher, which requires the back-end load of the power supply system to have a small current peak and a short duration when it is turned on. [0003] The output load of the traditional power supply system uses a switch-controlled DC-DC power converter, and the commonly used switch-controlled DC-DC power converter (such as figure 1 (shown) when starting, the output voltage rises from 0V to the rated output voltage period, an...

AI Technical Summary

Problems solved by technology

But its disadvantage is: the degree of suppression of the peak value of the starting current is small, and it obviously cannot meet the requirements for a power supply that requires a small peak value of the starting current.

Images