DC converter and control method thereof
A DC converter and DC conversion technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve problems such as fuel cell system disturbances and complex design of excitation sources, and achieve measurement, structure, etc. The effect of a simple, streamlined design
Active Publication Date: 2019-11-08
HEFEI UNIV OF TECH
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Problems solved by technology
[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a DC converter and its control method, which are used to solve the disturbance of the fuel cell system and the design comparison of the excitation source in the prior art when the fuel cell impedance is measured. complex technical issues
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[0038] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0039] see Figure 1-9 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily d...
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The invention provides a DC converter and a control method thereof. The DC converter comprises a DC conversion circuit and a controller, wherein the DC conversion circuit comprises a DC conversion main circuit and a disturbance circuit, the input end of the DC conversion main circuit is connected with the output end of a fuel cell stack, and the DC conversion main circuit is used for converting the output voltage of the fuel cell stack; the disturbance circuit is connected in parallel with the input end of the DC conversion main circuit and used for disturbing the output voltage and current ofthe fuel cell stack; the controller is respectively coupled with the DC conversion main circuit and the disturbance circuit, and the controller is used for controlling the disturbance current of thedisturbance circuit so as to introduce disturbance into the output voltage of the fuel cell stack and obtain the impedance of the fuel cell stack. According to the invention, the DC converter is internally provided with a simple disturbance circuit, thereby achieving the measurement of the impedance of the fuel cell while achieving the DCDC conversion and voltage stabilization.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a DC converter and a control method thereof. Background technique [0002] A fuel cell is an electrical power generating device that converts chemical energy produced by the oxidation of fuel directly into electrical energy. Fuel cells are usually made up of stacked components called fuel cell stacks. The cells of each unit are closely arranged one after the other. When any unit cell in the fuel cell fails or its performance decreases, the performance of the entire fuel cell will decrease. . Therefore, it is necessary to accurately diagnose the state of the fuel cell stack, because the output of the fuel cell is affected by the internal conditions of the fuel cell, such as the dry or flooded state of the fuel cell can lead to a reduction in the life of the fuel cell, and the internal resistance can comprehensively reflect the internal temperature of the fuel cell , hu...
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Login to View More IPC IPC(8): H02M3/158H02M1/32
CPCH02M1/32H02M3/158
Inventor 苏建徽蔡志成汪海宁杜燕施永张健
Owner HEFEI UNIV OF TECH