Ultra wide range high power converter circuit

Abstract

The invention relates to an ultra-wide range high-power converter circuit, which includes a transformer module, a primary side input module, a first and a second secondary side output module, a high and low voltage mode control module, and a load output module. The first secondary output module includes a first rectification network, a second rectification network and a first parameter equalization network, and the second secondary output module includes a third rectification network, a fourth rectification network and a second parameter equalization network network. The circuit also includes a first resonant voltage sharing network and / or a second resonant voltage sharing network. The resonant voltage equalizing 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. In the present invention, it is surprisingly found that by setting the resonant voltage equalizing network, the specific secondary side bias problem caused by the change of the wave transmission 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 an 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 requirem...

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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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