Novel ultra-wide-range high-power converter circuit

Abstract

The invention relates to an ultra-wide-range high-power converter circuit which comprises a transformer module, a primary side input module, a first secondary side output module, a second secondary side output module, a high-low voltage mode control module and a load output module. The first secondary side output module comprises a first rectification network, a second rectification network and a first parameter voltage-sharing network, and the second secondary side output module comprises a third rectification network, a fourth rectification network and a second parameter voltage-sharing network. The circuit further comprises a first resonance voltage-sharing network and / or a second resonance voltage-sharing network. The resonance voltage-sharing network is connected between the output end of the first rectification network and the input end of the second rectification network or between the input end of the first rectification network and the output end of the second rectification network. By arranging the resonance voltage-sharing network, the specific secondary side bias voltage problem caused by the change of wave control of the LLC resonant converter under light load can be perfectly solved.

Description

technical field [0001] The invention relates to the field of power supply modules, and more specifically relates to a novel ultra-wide range high-power converter circuit. Background technique [0002] In the field of high-power applications, the input is a three-phase AC power grid. Because of the power factor requirements, the pre-stage needs to design a three-phase active power factor correction circuit. Because of the three-phase power grid input, the output bus voltage of the three-phase active power factor correction circuit is relatively high. According to the current device situation, the method of connecting electrolytic capacitors in series is usually used, such as figure 1 shown. [0003] In the application of the two-stage topology of the charging power supply module, the outputs BUS+ and BUS- of the previous stage circuit are used as the input of the subsequent stage DC / DC converter. Usually, there are two different connection methods according to different req...

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Problems solved by technology

[0008] Through further research, it is found that the cause of the bias voltage in this particular case is not caused by the parameter deviation of the resonant component, but because of the change of the wave control of the LLC resonant converter under light load, so image 3 The wide range constant power converter shown cannot solve such a voltage sharing problem

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