A dc/dc converter with fuel cell internal resistance measurement function and internal resistance measurement method
A fuel cell and converter technology, applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, output power conversion devices, etc., can solve the problems of complex excitation source design, output influence, etc., and overcome the complexity of devices and algorithms Effect
Active Publication Date: 2021-07-23
HEFEI UNIV OF TECH
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Problems solved by technology
[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a DC / DC converter and its control method for measuring the internal resistance of the fuel cell, so as to solve the problem of complex design of the excitation source and disturbance of the excitation source to the output in the prior art. problems such as impact
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[0031] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0032] figure 1 A schematic diagram of the main circuit topology of a DC / DC converter for measuring the internal resistance of a fuel cell provided by the present invention, including a boost circuit and a disturbance circuit.
[0033] The boost boost circuit includes a switch tube, an inductor, a capacitor and a diode, and the diode D 1 The cathode and capacitance C 1 The positive connection of the boost converter is used as the positive output of the boost converter; the switching tube Q 1 The source or emitter of the capacitor C 1 The negative pole connection of the boost converter is used as the output nega...
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The present invention provides a DC / DC converter with the function of measuring the internal resistance of a fuel cell and a method for measuring the internal resistance, and relates to the field of power electronics. The DC / DC converter adds a power disturbance circuit to a boost circuit, and Power disturbance is applied to the fuel cell stack through the on-off control of the switch tube in the disturbance circuit. In the process of power disturbance, the fuel cell port voltage and current are sampled, Fourier transform is performed, the voltage and current components of the disturbance frequency are extracted, and the internal resistance of the fuel cell is calculated, which overcomes the previous device and algorithm based on disturbance measurement of the internal resistance of the fuel cell The disadvantage of being too complex.
Description
technical field [0001] The invention relates to the field of power electronics, and more specifically relates to a DC / DC converter for measuring the internal resistance of a fuel cell and a method for measuring the internal resistance. 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. [0003] Since the output of the fuel cell is affected by the internal conditions of the fuel cell, and the internal resistance can comprehensively reflect the internal temperature, humidity and health status of the fuel cell, the monitoring of the internal resistance of each single-chip fuel cell is the key to ensure the safe and efficient operation of the fuel cell . The internal resistance of the fuel cell has obvious nonlinear and time-varying characteristics, and it is generally difficult to measure accurately. Therefore, the monitoring of the internal resistan...
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IPC IPC(8): G01R27/08G01R23/16G01R31/389H02M3/158
CPCG01R23/16G01R27/08G01R31/389H02M3/158
Inventor 施永徐冬苏建徽赖纪东张健
Owner HEFEI UNIV OF TECH