Stepless control series/parallel bidirectional power supply circuit and control method thereof
A bidirectional power supply and pole control technology, which is applied in control/regulation systems, electrical components, and adjustment of electrical variables, can solve the problems of difficult magnetic component design, unfavorable multi-module expansion, and inability to achieve smooth transitions.
Inactive Publication Date: 2021-02-12
HUNAN UNIV
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Problems solved by technology
The wide range of switching frequency fs makes it difficult to design magnetic components. In addition, if the switching frequency fs deviates too much from the resonant frequency fr, the performance of the converter will decrease; loss, reducing the efficiency of the converter
[0004] However, in the prior art, the optimization method of adding active switches on the input and output sides can broaden the gain range to a certain extent, but it is still not suitable for occasions requiring a gain of more than 3 times, and this type of method is not conducive to multi-module expansion
For the optimization strategy of frequency modulation, phase shifting and full-bridge / half-bridge operating mode switching, phase-shifting will lead to the loss of certain ZVS performance and reduce the efficiency of the converter. In addition, the transient switching process of full-bridge and half-bridge still cannot be smooth. Transition, there is a large impact on the load and the resonant cavity
Method used
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[0027] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be described in detail below. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in the present application, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present application.
[0028] In order to increase the gain of the LLC resonant converter, Embodiment 1 of the present application provides a stepless control series / parallel bidirectional power supply circuit.
[0029] see figure 1 , a specific embodiment of the stepless control series / parallel bidirectional power supply circuit provided by this application, the following is figure 1 The circuit shown is illustrative of the application.
[0030] As shown in the figure, the stepless...
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The invention discloses a stepless control series / parallel bidirectional power supply circuit and a control method thereof. The power supply circuit comprises a first switching circuit, a second switching circuit, a first direct-current conversion circuit (phase1) and a second direct-current conversion circuit (phase2); switching on or switching off of the first switching circuit, the second switching circuit and switching tubes in the phase1 and the phase2 is controlled, so that the input sides of the phase1 and the phase2 are connected in parallel and the output sides are connected in seriesor in parallel. The series / parallel bidirectional power supply topology can realize ultra-wide voltage gain, can be widely applied to occasions of wide-range voltage input and wide-range voltage output, and effectively solves the problem of gain limitation of traditional LLC resonant converters and other topologies. Besides, since the phase1 and the phase2 share an output side filter capacitor, seamless switching between series connection and parallel connection can be realized, and the impact of a transient process on a load side is reduced.
Description
technical field [0001] The present application relates to the technical field of LLC resonant circuits, in particular to a stepless control series / parallel bidirectional power supply circuit and a control method thereof. Background technique [0002] DC / DC converters are widely used in new energy storage, DC microgrid, large data centers, electric vehicle charging and LED lighting. In applications where energy flows in one direction, such as large data centers, unidirectional DC / DC converters have been widely used due to their simple structure and control. However, due to the rapid development and application of new energy power generation and DC microgrids, energy storage It has become an indispensable link, and the traditional unidirectional power supply cannot meet the needs of bidirectional energy flow, so bidirectional DC / DC converters are becoming the mainstream converters for industry applications and research. For the LLC resonant converter in the DC converter, it r...
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IPC IPC(8): H02M3/335H02M3/28
CPCH02M3/33584H02M3/285H02M1/0067H02M1/0077
Inventor 岳秀梅李奎马琳郑真李情汪洪亮罗安
Owner HUNAN UNIV