Symmetrical three-level BOOST converter and short-circuit protection method thereof
A short-circuit protection, three-level technology, applied in the direction of adjusting electrical variables, converting DC power input to DC power output, instruments, etc., can solve the problems of electrolytic capacitor burst, electrolyte overflow, fire and other problems, so as to avoid the bus capacitor overload. The effect of pressure burst
Pending Publication Date: 2022-07-01
SUNGROW POWER SUPPLY CO LTD
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[0003] However, for a symmetrical three-level BOOST topology with two or more inputs, if there is a short circuit between the positive and negative poles of different BOOST circuits, for example, when the positive pole of one input and the negative pole of another input are short-circuited at the same time, it will cause The half-bus and full-bus of the symmetrical three-level BOOST topology are overvoltage; at the same time, since the DC input side and the subsequent power grid are often not automatically cut off after the bus is overvoltage, the overvoltage of the bus is likely to cause the electrolytic capacitor to burst and blow out. Electrolyte flows freely inside the product, causing a wider short circuit and even a risk of fire
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[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0050] In this application, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also no Other elements expressly listed, or which are also inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phra...
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The invention provides a symmetrical three-level BOOST converter and a short-circuit protection method thereof, and the method comprises the steps: judging whether input positive and negative electrode short circuits exist between different BOOST circuits or not according to the detection information of a rear-stage bus of the BOOST converter and each BOOST circuit in the BOOST converter; if yes, a switch tube branch in a BOOST circuit related to input positive and negative electrode short circuit is controlled to be directly connected, so that overvoltage of a rear-stage bus or a half bus caused by overcharge of upper and lower capacitors of the rear-stage bus is avoided, and serious secondary hazards such as short circuit in a wider area and property loss caused by overvoltage burst of bus capacitors can be avoided.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a symmetrical three-level BOOST converter and a short-circuit protection method thereof. Background technique [0002] In recent years, in order to adapt to the continuous improvement of the voltage level and power level requirements of power electronics, multi-level converters have attracted more and more attention. At the same time, those skilled in the art have replaced single-input converters with multi-input converters in order to simplify the circuit structure. It can realize the preferential utilization of energy and improve its flexibility. [0003] However, for a symmetrical three-level BOOST topology with two or multiple inputs, if there is a short circuit between the positive and negative poles of the inputs between different BOOST circuits, for example, when the positive pole of one input and the negative pole of the other input are short-circuited at the sa...
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IPC IPC(8): H02M3/156H02M1/32
CPCH02M3/156H02M1/32
Inventor 别伟张兵徐安安曹金虎胡凡宇潘年安王武博
Owner SUNGROW POWER SUPPLY CO LTD