A dc/dc resonance module

Abstract

The present invention belongs to the power source technical field and relates to a DC / DC conversion module. The DC / DC conversion module includes N sets of conversion units and a magnetic pole, wherein N is a positive integer greater than 1; each conversion unit comprises a voltage dividing unit, a first switch unit, a second switch unit, a first resonant capacitor, a first resonant inductor, a first transformer and a rectification unit; the voltage dividing units in the N sets of conversion units are connected in series; the voltage dividing units in the N sets of conversion units are used for performing equal voltage division on inputted direct current; the first resonant inductors in the N sets of conversion units are wound on the magnetic pole in a coupled manner; the frequencies of the first resonant inductors in the N sets of conversion units are the same; and the windings of the first resonant inductors in the N sets of conversion units have the number of turns; after the N inductors are coupled together, a forced current equalizing function can be realized, so that the voltage of each input capacitor is balanced.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a DC / DC resonant module. Background technique [0002] In the DC power supply system of electronic equipment such as site power supply or data center, in the AC / DC power supply module, the DC output voltage of the power factor correction circuit (PFC—power factor correction) is usually around 760V ~ 820V, or even higher, Generally, it is not used directly for the load, so a DC / DC circuit will be added after the PFC circuit; [0003] The DC / DC device contains 2 sets of conversion units, the conversion unit includes a voltage division unit, a first switch unit and a second switch unit, a resonant capacitor, a resonant inductance, a transformer, and a rectifier unit, the N is a positive integer greater than 1; [0004] There are following problems in prior art: [0005] The parameters of the resonant inductance in the first conversion unit and the parameters of the resonan...

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Problems solved by technology

[0005] The parameters of the resonant inductance in the first conversion unit and the parameters of the resonant inductance in the second conversion unit need to be set to be the same. However, since the parameters of the resonant inductance in the first conversion unit are different from those in the second conversion unit The parameters of the resonant inductance have a certain tolerance range, which may lead to a large difference between the actual parameters of the resonant inductance in the first conversion unit and the actual parameters of the resonant inductance in the second conversion unit during the operation of the resonant circuit. difference

Similarly, the parameters of the resonant capacitor in the first conversion unit and the parameters of the resonant capacitor in the second conversion unit may also have similar problems

The difference between the parameter of the resonant inductance in the first conversion unit and the parameter of the resonant inductance in the second conversion unit, and the difference between the parameter of the resonant capacitor in the first conversion unit and the parameter of the resonant capacitor in the second conversion unit will be As a result: the resonance current passing through the primary side of the transformer in the first conversion unit is different from the resonance current passing through the primary side of the transformer in the second conversion unit, and the secondary voltage of the transformer in the first conversion unit is different from that of the transformer in the second conversion unit The secondary voltages of the two LLC resonant converters are different, and the output current values ​​of the rectifier unit in the first conversion unit and the rectifier unit in the first conversion unit are also different, so that the power of the two LLC resonant converters cannot be balanced, resulting in the first voltage division unit Cin1, The voltage on the second voltage dividing unit Cin2 is unbalanced (the voltage of one of them is relatively large, and the voltage of the other is relatively small). In severe cases, the voltage stress of the power switch tube will exceed the standard and be damaged (the general voltage difference in the example cannot exceed 50V)

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