Modular dc-dc converter control unit based on distributed ripple self-elimination circuit
A DC-DC and converter control technology, applied in the direction of electrical components, adjusting electrical variables, control/regulation systems, etc., can solve the problems of poor anti-fault ability, high cost, poor scalability, etc., to improve service life, reduce Small size, the effect of improving power quality
Active Publication Date: 2020-04-14
ZHEJIANG UNIV
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Problems solved by technology
N distributed DC-DC converters generally only have one master controller and N-1 slave controllers. The working sequence of the system is controlled by the master controller, and the master controller and slave controllers are synchronized by optical fiber cables. and interleaved parallel connection, the cost is high; N centralized DC-DC converters have only one general controller, and the timing of all converters is controlled by the general controller. Since there is only one set of control circuits, there is poor anti-fault ability, which can Disadvantages such as poor scalability are not suitable for plug-and-play occasions of DC-DC converters
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[0040] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings from specific embodiments.
[0041] Such as figure 1 As shown, the present invention is based on a distributed ripple self-elimination circuit modular DC-DC converter control unit, including a distributed ripple self-elimination circuit, a power loop signal sampling and conditioning circuit, a duty ratio digital controller, and a power drive The circuit; the distributed ripple self-elimination circuit includes: a power coupling circuit, which is used to sense the own output voltage ripple of the DC-DC converter module; a phase signal sampling and conditioning circuit, which is used to collect the DC-DC converter itself The output voltage ripple and the total output voltage ripple of the parallel DC-DC converter, and obtain the instantaneous difference between the total output volta...
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The invention discloses a modular DC-DC converter control unit based on a distributed ripple self-cancellation circuit. The synchronous optical fiber cables used in the traditional parallel DC-DC converter interleaving technology are omitted, and cost is saved. The output voltage ripple is reduced in order to reduce the sizes of the input filter and the output capacitor and improve the service life of the capacitor. Unlike the traditional centralized DC-DC converter, the phase shift angle of the distributed ripple self-cancellation circuit of the invention is not determined by the number of DC-DC converters in the system due to the existence of a feedback link in the plug-and-play scenario of DC-DC converters. Therefore, the modular DC-DC converter control unit has remarkable advantages over the centralized DC-DC converter.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a modularized DC-DC converter control unit based on a distributed ripple self-elimination circuit. Background technique [0002] In practical industrial applications, considering objective factors such as power level, system maintenance, and reliability, multiple modular DC-DC converters with the same parameters and manufacturing process are often connected in parallel at their input and output ports. The idea of modularization has been studied in many sub-fields in the field of power electronics. In the field of photovoltaic systems, micro-inverters and photovoltaic panels are integrated into micro-inverter modules, which are easy to install and maintain; further, for each Each micro-inverter module is equipped with a photovoltaic optimizer. For example, the Chinese patent with the publication number CN104065336A proposes a photovoltaic optimizer with int...
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IPC IPC(8): H02M3/158H02M3/157H02M1/14
CPCH02M1/14H02M3/157H02M3/158
Inventor 张若琦陈竞辉胡兴懿吴建德何湘宁
Owner ZHEJIANG UNIV