Resonant DC-DC converter
A DC-DC and converter technology, applied in the field of resonant DC-DC converters, can solve the problems of narrow gain range, non-isolation, and inability to guarantee safety, and achieve the effect of widening the voltage gain range and widening input voltage characteristics
Active Publication Date: 2021-02-12
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
[0004] In previous studies, supercapacitors mostly passed figure 1 The middle and two-way Buck / Boost circuit is connected to the DC microgrid. This topology is simple and low in cost, but the gain can only be adjusted by adjusting the duty cycle of the switching device. The gain range is narrow and not isolated, so the safety cannot be guaranteed.
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[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0018] The purpose of the present invention is to provide a resonant DC-DC converter, which is compatible with a wide range of fluctuations in the supercapacitor input voltage while maintaining the stability of the DC bus voltage, and broadens the range of voltage gain.
[0019] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction ...
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The invention relates to a resonant DC-DC converter, and the converter comprises an input voltage-dividing capacitor circuit, a three-level bridge arm, a two-level bridge arm, a series resonance unit,a transformer and a bridge rectifier unit; The converter adopts a three-level bridge arm, two-level bridge arm and bridge rectifier unit structure, combines full-bridge / half-bridge mode switching ofa three-level bridge structure and a conventional bridge structure, and dynamically adjusts the working modes of the converter according to the voltage of the super capacitor side, and achieves the function of switching three working modes by the same circuit, so the input voltage of the super capacitor with wide-range fluctuation is compatible while the voltage stability of a direct-current bus is maintained, the wide input voltage characteristic of the resonant DC-DC converter is ensured, and the voltage gain range is widened.
Description
technical field [0001] The invention relates to the technical field of converters, in particular to a resonant DC-DC converter. Background technique [0002] The large-scale development and utilization of renewable energy has opened up a new way to solve the world's energy and environmental problems. At the same time, the output of photovoltaic, fan, fuel cell, energy storage and other units is DC or non-industrial frequency AC. At present, many electrical equipment such as electric vehicles, mobile phones, LED lighting and DC inverter motors are driven by DC. Therefore, the concept of DC microgrid has been emerging in recent years. [0003] The output of renewable energy and the load in the DC microgrid have large random fluctuations, which will impact the bus voltage of the DC microgrid and affect its safe and stable operation. For this reason, more energy storage units such as batteries and supercapacitors are connected to the DC microgrid to stabilize power fluctuation...
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Login to View More IPC IPC(8): H02M3/335
CPCH02M3/33584Y02B70/10
Inventor 李微问虎龙周雪松马幼捷杜明星赵浛宇尹金良白冰
Owner TIANJIN UNIVERSITY OF TECHNOLOGY