Voltage feedforward-based direct current voltage boosting converter control method

A converter control and DC boost technology, applied in the field of control, can solve the problems of the input current fluctuation of the DC boost converter and the inability of the hydrogen fuel cell to provide the output current, etc.

Inactive Publication Date: 2018-08-17
BEIJING SINOHYTEC
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Problems solved by technology

[0003] While the vehicle is running, many external factors, such as road conditions, vehicle braking, etc., will have a greater impact on the voltage on the power battery bus, which in turn will cause fluctuations in the input current of the DC boost converter.
If the performance of the power battery is seriously attenuated, the maximum fluctuation range of its output voltage can reach more than 100V, and the current closed-loop feedback control of the traditional current PI regulation used in the current DC boost converter is in the face of a large power battery voltage fluctuation range. , cannot respond to changes in output voltage in time, resulting in the hydrogen fuel cell being unable to provide a stable output current

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[0029] Figure 1-2 and the following description describe alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. In order to teach the technical solutions of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art should understand that modifications or substitutions from these embodiments will fall within the protection scope of the present invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. As such, the invention is not limited to the alternative embodiments described below, but only by the claims and their equivalents.

[0030] figure 1 A DC boost converter according to one embodiment of the invention is shown. like figure 1As shown, the DC boost converter includes a series-connected pre-stage boost circuit and a post-stage boost circuit, wherein th...

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Abstract

The invention provides a voltage feedforward-based direct current voltage boosting converter control method. The control method comprises the following steps of detecting the input voltage, output voltage, input current and output current of the direct current voltage boosting converter; calculating the voltage feedforward duty ratio and calculating the current duty ratio by using a PI closed-loopalgorithm; judging whether the voltage feedforward duty ratio is less than a set maximum voltage duty ratio or not; if so, calculating the final duty ratio according to the current duty ratio and thevoltage feedforward duty ratio; and if not, calculating the final duty ratio according to the current duty ratio and the maximum voltage duty ratio, and controlling a power tube switch of the directcurrent voltage boosting converter based on the final duty ratio. The method has the advantages as follows: on the basis of the conventional current PI closed loop control direct current voltage boosting converter, voltage feedforward control is added, so that interference of fuel cell output voltage high fluctuation to the current PI closed loop control is suppressed, and the reaction speed of the direct current voltage boosting converter is increased.

Description

technical field [0001] The invention relates to a control method, in particular to a voltage feed-forward-based DC boost converter control method. Background technique [0002] A hydrogen fuel cell is a power generation device that directly converts the chemical energy generated by the reaction of hydrogen and oxygen into electrical energy through an electrochemical reaction. It has the advantages of high power generation efficiency and low environmental pollution, so it is widely used in the automotive field. However, the output voltage of the hydrogen fuel cell is relatively low, and the voltage needs to be increased by a DC boost converter to meet the demand for powering the vehicle. The DC boost converter should ensure the stable output of the hydrogen fuel cell to ensure the smooth operation of the vehicle. The existing DC boost converters all use the current closed-loop feedback control method to ensure the stable and smooth output of the hydrogen fuel cell current. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 孔越
Owner BEIJING SINOHYTEC
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