Intelligent high-voltage large-current rectification system

Abstract

The invention relates to the technical field of remote control, in particular to an intelligent high-voltage large-current rectification system, whether the rectification process is qualified or not is analyzed according to the current value after rectification and filtering, secondary judgment is carried out based on the fluctuation condition of the current value after rectification in historical data, and the reason for the unqualified rectification process is analyzed. According to the method, the filtering process is analyzed to be unqualified when the variance of the current value of the historical data is large, the ripple coefficient is reduced by increasing the frequency of the signal source, so that the filtering effect is improved, but the frequency characteristic of the circuit can be influenced by the change of the frequency of the signal source, so that the filtering effect is improved. When the power supply frequency is close to the signal source frequency, the frequency mixing phenomenon is easily generated, and the signal quality and accuracy are influenced, the signal source frequency is adjusted according to the difference value between the signal source frequency and the power supply frequency, so that the frequency mixing phenomenon is avoided, and the signal filtering effect is improved while the signal quality is ensured.

Description

Technical Field

[0001] The present invention relates to the field of remote control technology, and in particular to an intelligent high-voltage and high-current rectification system. Background Art

[0002] High current rectification refers to the process of converting alternating current (AC) into direct current (DC) in the field of power electronics, and the current involved in the conversion process is relatively large. This conversion is usually used in power systems, industrial equipment, charging stations, inverters, power supplies and other occasions that require high-power DC power. The prior art connects one end of the data server and the monitoring terminal through Ethernet, and the other end of the data server is connected to the internal LAN, which improves production efficiency and management level. However, the control accuracy of the high current rectification process is low, and the maintenance efficiency is slow when the rectification is unqualified, resulting in waste of resources.

[0003] Chinese patent application number: CN201610957199.6 discloses a large current rectifier control system, which belongs to the field of remote control technology. The large current rectifier control system includes: equipment layer, communication layer and monitoring layer; the equipment layer includes a rectifier cabinet; the communication layer includes a controller, a field bus, Ethernet, and an internal LAN; the monitoring layer includes a monitoring terminal, a remote control terminal and a data server; the rectifier cabinet is provided with a variety of measurement and control modules, and the various measurement and control modules are all connected to the field bus, the field bus is respectively connected to one end of the controller and the remote control terminal, the other end of the controller is connected to the Ethernet, the Ethernet is respectively connected to one end of the data server and the monitoring terminal, and the other end of the data server is connected to the internal LAN. This large current rectifier control system can greatly improve production efficiency and management level.

[0004] However, the prior art still has the following problems: The control accuracy of the large current rectification process is low, and the maintenance efficiency is slow when the rectification is unqualified. Summary of the invention

[0005] To this end, the present invention provides an intelligent high-voltage and high-current rectification system to overcome the problems of low control accuracy of the high-current rectification process and slow maintenance efficiency when the rectification is unqualified in the prior art.

[0006] To achieve the above object, the present invention provides an intelligent high-voltage and high-current rectification system. It includes: A power supply module, which is used to provide a large current; A voltage transformation module, which is connected to the power supply module and is used to change the voltage to adjust the input voltage and output it; A rectifier module, connected to the power supply module, for rectifying the large current; A filtering module, connected to the rectifying module, for filtering the rectified current; A detection module, connected to the filtering module, for obtaining the filtered electrical signal; An analysis module is connected to the power supply module, the transformer module, the rectifier module, the filter module and the detection module, and is used to determine whether the rectification of the power supply end is qualified according to the acquired current signal, and to make a secondary determination on whether the rectification of the power supply end is qualified based on historical data, and to analyze the reasons for the unqualified rectification of the power supply end based on the current, the reasons including: unqualified circuit layout and unqualified transformer, Based on the analyzed reasons, a corresponding processing method is selected, which includes: increasing the frequency of the signal source and reducing the number of turns of the primary coil of the transformer.

[0007] Furthermore, the analysis module determines whether the rectification of the power supply end is qualified according to the acquired current signal, including: The detection module is used to periodically obtain the filtered current. The analysis module determines whether the rectification at the power supply end is qualified based on the current. A secondary determination is made on whether the rectification at the power supply end is qualified based on historical data, or a determination is made that the rectification at the power supply end is unqualified, and the cause of the unqualified is analyzed based on the current.

[0008] Furthermore, the analysis module performs a secondary determination on whether the rectification at the power supply end is qualified based on the historical data, including: The analysis module obtains the historical data measured by the detection module, calculates the variance of the current in the historical data, and determines whether the rectification at the current end is qualified based on the variance. The analysis module determines that the rectification for the current end is unqualified, and based on the reason for the unqualified current analysis, or determines that the rectification for the current end is qualified, and determines that the filtering process is unqualified.

[0009] Furthermore, the analysis module calculates the difference between the signal source frequency and the power supply frequency under the condition that the filtering is determined to be unqualified, and increases the signal source frequency based on the difference, wherein: The increase in the source frequency is positively correlated to the difference.

[0010] Furthermore, the analysis module analyzes the reasons for the unqualified rectification of the current terminal based on the current, including: calculating a difference between the current and the first preset current, The analysis module determines that the circuit layout is unqualified. The analysis module determines the reason why the rectification at the current end is unqualified based on the voltage signal measured by the detection module, or determines that the transformer is unqualified.

[0011] Furthermore, the analysis module is also used to reduce the circuit length and loop area based on the difference between the current and the first preset current when the circuit layout is unqualified, wherein: The reduction in circuit length and the reduction in loop area are directly related to the difference.

[0012] Furthermore, the analysis module is also used to analyze the reasons for the unqualified rectification of the current terminal based on the voltage signal measured by the detection module, including: The analysis module obtains the voltage waveform, The analysis module determines that the transformer is unqualified based on the voltage waveform, or determines that the circuit layout is unqualified.

[0013] Furthermore, the analysis module is also used to reduce the number of turns of the primary coil of the transformer based on the difference between the current and the first preset current when the transformer is determined to be unqualified, wherein: The amount of reduction in the number of turns is positively correlated with the difference.

[0014] Compared with the prior art, the beneficial effect of the present invention lies in that, in the present invention, whether the rectification process is qualified is analyzed according to the current value after rectification and filtering, and when the current value is between the first preset current and the second preset current, a secondary judgment is made on whether the rectification is qualified based on the fluctuation of the current value after rectification in the historical data. When the fluctuation amplitude of the current value is large, the filtering process is judged to be unqualified. When the fluctuation amplitude of the current value is small or the current value is large, the reason for the unqualified rectification process is analyzed based on the current value, and the corresponding parameters are adjusted according to the analysis results, so as to improve the filtering effect of the signal while ensuring the signal quality.

[0015] Furthermore, in the present invention, when the variance of the current value of the historical data is large, the filtering process is analyzed to be unqualified. Increasing the signal source frequency will reduce the ripple factor, thereby improving the filtering effect. However, considering that the change of the signal source frequency will affect the frequency characteristics of the circuit, when the power supply frequency is close to the signal source frequency, mixing is likely to occur, thereby affecting the quality and accuracy of the signal. Normally, the signal source frequency is greater than the power supply frequency. The present invention adjusts the signal source frequency according to the difference between the signal source frequency and the power supply frequency, thereby avoiding the occurrence of mixing, and improving the filtering effect of the signal while ensuring the signal quality.

[0016] Furthermore, in the present invention, when it is determined that the circuit layout is unqualified, the rectification efficiency is improved by reducing the circuit length and loop area, thereby reducing crosstalk interference in the circuit and improving signal integrity.

[0017] Furthermore, the present invention takes into account that actual transformer windings always have leakage inductance, which will hinder the change of current during the commutation process and affect the rectifier output voltage. Due to the existence of leakage inductance, when the diode or thyristor is suddenly turned off during the rectification process, the sharp change of current will produce a spike voltage on the leakage inductance, and the spike voltage will be superimposed on the output voltage, resulting in voltage waveform distortion. Therefore, the present invention reduces the number of turns of the primary coil of the transformer when determining that the voltage waveform is distorted, thereby increasing the primary coil current, while improving the quality factor of the resonant circuit and improving the efficiency of the rectifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the structural block diagram of the intelligent high voltage and high current rectification system; Figure 2 A flow chart for analyzing whether the rectification at the power supply end is qualified; Figure 3 A flow chart for secondary determination of whether the rectification at the power supply end is qualified; Figure 4 A flow chart for analyzing the causes of unqualified rectification at the current end. DETAILED DESCRIPTION

[0019] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] It should be pointed out that the data in this embodiment are obtained by comprehensive analysis and evaluation of the historical data of the system of the present invention in the six months before this determination and the corresponding historical determination results. It can be understood by those skilled in the art that the determination method of the system of the present invention for a single parameter mentioned above can be to select the value with the highest proportion as the preset standard parameter according to the data distribution, use weighted summation to use the obtained value as the preset standard parameter, substitute each historical data into a specific formula and use the value obtained by the formula as the preset standard parameter or other selection methods, as long as the system of the present invention can clearly define different specific situations in the single determination process through the obtained values.

[0021] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0022] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0023] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See also Figure 1 As shown, it is a structural block diagram of an intelligent high-voltage and high-current rectification system.

[0025] The present invention provides an intelligent high-voltage and high-current rectification system, comprising: A power supply module, which is used to provide a large current; A voltage transformation module, which is connected to the power supply module and is used to change the voltage to adjust the input voltage and output it; A rectifier module, connected to the power supply module, for rectifying the large current; A filtering module, connected to the rectifying module, for filtering the rectified current; A detection module, connected to the filtering module, for obtaining the filtered electrical signal; An analysis module is connected to the power supply module, the transformer module, the rectifier module, the filter module and the detection module, and is used to determine whether the rectification of the power supply end is qualified according to the acquired current signal, and to make a secondary determination on whether the rectification of the power supply end is qualified based on historical data, and to analyze the reasons for the unqualified rectification of the power supply end based on the current, the reasons including: unqualified circuit layout and unqualified transformer, Based on the analyzed reasons, a corresponding processing method is selected, which includes: increasing the frequency of the signal source and reducing the number of turns of the primary coil of the transformer.

[0026] Specifically, in this embodiment, there is no limitation on the specific structures of the power supply module, the transformer module, the rectifier module, the filter module and the detection module, and they only need to be able to realize the corresponding functions.

[0027] Specifically, in this embodiment, the specific structure of the analysis module is not limited, and it can be composed of logic components, and the logic components include a field programmable processor, a computer, and a microprocessor in the computer.

[0028] See also Figure 2 As shown, it is a flow chart for analyzing whether the rectification at the power supply end is qualified.

[0029] Specifically, the analysis module determines whether the rectification of the power supply end is qualified according to the acquired current signal, including: The detection module is used to periodically obtain the filtered current. If the current is less than or equal to the first preset current, the analysis module determines that the rectification for the power supply end is qualified; If the current is greater than the first preset current and less than or equal to the second preset current, the analysis module determines whether the rectification of the power supply end is qualified based on historical data; If the current is greater than the second preset current, the analysis module determines that the rectification for the power supply end is unqualified, and analyzes the reason for the unqualified based on the current.

[0030] Specifically, in this embodiment, the first preset current is 1.05 to 1.15 times the current value required after filtering, and the second preset current is 1.2 to 1.25 times the current value required after filtering.

[0031] See also Figure 3 As shown, it is a flow chart for secondary determination of whether the rectification at the power supply end is qualified.

[0032] Specifically, the analysis module performs a secondary determination on whether the rectification at the power supply end is qualified based on historical data, including: The analysis module obtains the historical data measured by the detection module, calculates the variance of the current in the historical data, and determines whether the rectification at the current end is qualified based on the variance. If the variance is less than or equal to the preset variance, the analysis module determines that the rectification of the current terminal is unqualified, and analyzes the reason for the unqualified current; If the variance is greater than the preset variance, the analysis module determines that the rectification at the current end is qualified, and determines that the filtering process is unqualified.

[0033] Specifically, in this embodiment, the preset variance is obtained by pre-measurement, and a fixed current value is used. Different devices are used for rectification and filtering, and the same required current value is set for rectification and filtering. The actual current value after filtering is recorded respectively, and the variance of the actual current value is solved. The preset variance is 0.9~1.15 times the variance of the actual current value.

[0034] Specifically, the analysis module calculates the difference between the signal source frequency and the power supply frequency under the condition that the filtering is determined to be unqualified, and increases the signal source frequency based on the difference, wherein: The increase in the source frequency is positively correlated to the difference.

[0035] In this embodiment, optionally, Compare the difference between the signal source frequency and the power supply frequency with the first-order difference and the second-order difference. If the difference between the signal source frequency and the power supply frequency is less than or equal to the first level difference, the frequency of the first signal source is increased, and the frequency of the first signal source is 0.2 times the frequency of the initial signal source; If the difference between the signal source frequency and the power supply frequency is greater than the primary difference and less than or equal to the secondary difference, the second signal source frequency is increased, and the second signal source frequency is 0.25 times the initial signal source frequency; If the difference between the signal source frequency and the power supply frequency is greater than the secondary difference, the third signal source frequency is increased, and the third signal source frequency is 0.35 times the initial signal source frequency; The first-level difference is 0.05 times the power supply frequency, and the second-level difference is 0.1 times the power supply frequency.

[0036] See also Figure 4 As shown, it is a determination flow chart for analyzing the reasons for the unqualified rectification at the current end.

[0037] Specifically, the analysis module analyzes the reasons for the unqualified rectification of the current terminal based on the current, including: calculating a difference between the current and the first preset current, If the difference is less than or equal to a first preset difference, the analysis module determines that the circuit layout is unqualified; If the difference is greater than the first preset difference and less than or equal to the second preset difference, the analysis module determines the reason for the unqualified rectification of the current terminal based on the voltage signal analyzed by the detection module; If the difference is greater than the second preset difference, the analysis module determines that the transformer is unqualified.

[0038] Specifically, in this embodiment, the first preset difference is 0.1 times the first preset current, and the second preset difference is 0.15 times the first preset current.

[0039] Specifically, the analysis module is further used to reduce the circuit length and loop area based on the difference between the current and the first preset current when the circuit layout is unqualified, wherein: The reduction in circuit length and the reduction in loop area are directly related to the difference.

[0040] In this embodiment, optionally, The difference between the current and the first preset current is compared with the first preset difference and the second preset difference, If the difference is less than or equal to the first preset difference, the first circuit length is reduced, and the first circuit length is 0.1 times the initial circuit length; If the difference is greater than the first preset difference and less than or equal to the second preset difference, the second circuit length is reduced to 0.2 times the initial circuit length; If the difference is greater than the second preset difference, the third circuit length is reduced, and the third circuit length is 0.25 times the initial circuit length.

[0041] Specifically, the analysis module is further used to analyze the reasons for the unqualified rectification of the current terminal based on the voltage signal measured by the detection module, including: The analysis module obtains the voltage waveform, If the voltage waveform is distorted, the analysis module determines that the transformer is unqualified; If there is no distortion in the voltage waveform, the analysis module determines that the circuit layout is unqualified.

[0042] Specifically, the analysis module is further configured to reduce the number of turns of the primary coil of the transformer based on the difference between the current and the first preset current when the transformer is determined to be unqualified, wherein: The amount of reduction in the number of turns is positively correlated with the difference.

[0043] In this embodiment, optionally, The difference between the current and the first preset current is compared with the first preset difference and the second preset difference, If the difference is less than or equal to the first preset difference, the first number of turns is reduced, and the first number of turns is 0.15 times the initial number of turns; If the difference is greater than the first preset difference and less than or equal to the second preset difference, the second number of turns is reduced, and the second number of turns is 0.2 times the initial number of turns; If the difference is greater than the second preset difference, the third number of turns is reduced, and the third number of turns is 0.3 times the initial number of turns.

[0044] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent high voltage and high current rectification system, characterized in that: include: A power supply module, which is used to provide a large current; A voltage transformation module, which is connected to the power supply module and is used to change the voltage to adjust the input voltage and output it; A rectifier module, connected to the power supply module, for rectifying the large current; A filtering module, connected to the rectifying module, for filtering the rectified current; A detection module, connected to the filtering module, for obtaining the filtered electrical signal; An analysis module is connected to the power supply module, the transformer module, the rectifier module, the filter module and the detection module, and is used to determine whether the rectification of the power supply end is qualified according to the acquired current signal, and to make a secondary determination on whether the rectification of the power supply end is qualified based on historical data, and to analyze the reasons for the unqualified rectification of the power supply end based on the current, the reasons including: unqualified circuit layout and unqualified transformer, Based on the analyzed reasons, a corresponding processing method is selected, which includes: increasing the frequency of the signal source and reducing the number of turns of the primary coil of the transformer.

2. The intelligent high voltage and high current rectifier system according to claim 1, characterized in that: The analysis module determines whether the rectification of the power supply end is qualified according to the acquired current signal, including: The detection module is used to periodically obtain the filtered current. The analysis module determines whether the rectification at the power supply end is qualified based on the current. A secondary determination is made on whether the rectification at the power supply end is qualified based on historical data, or a determination is made that the rectification at the power supply end is unqualified, and the cause of the unqualified is analyzed based on the current.

3. The intelligent high voltage and high current rectification system according to claim 1 is characterized in that: The analysis module performs a secondary determination on whether the rectification at the power supply end is qualified based on historical data, including: The analysis module obtains the historical data measured by the detection module, calculates the variance of the current in the historical data, and determines whether the rectification at the current end is qualified based on the variance. The analysis module determines that the rectification for the current end is unqualified, and based on the reason for the unqualified current analysis, or determines that the rectification for the current end is qualified, and determines that the filtering process is unqualified.

4. The intelligent high voltage and high current rectifier system according to claim 1, characterized in that: The analysis module calculates the difference between the signal source frequency and the power supply frequency under the condition that the filtering is determined to be unqualified, and increases the signal source frequency based on the difference, wherein: The increase in the source frequency is positively correlated to the difference.

5. The intelligent high voltage and high current rectification system according to claim 1 is characterized in that: The analysis module analyzes the reasons for the unqualified rectification of the current terminal based on the current, including: calculating a difference between the current and the first preset current, The analysis module determines that the circuit layout is unqualified. The analysis module determines the reason why the rectification at the current end is unqualified based on the voltage signal measured by the detection module, or determines that the transformer is unqualified.

6. The intelligent high voltage and high current rectifier system according to claim 5, characterized in that: The analysis module is also used to reduce the circuit length and loop area based on the difference between the current and the first preset current when the circuit layout is unqualified, wherein: The reduction in circuit length and the reduction in loop area are directly related to the difference.

7. The intelligent high voltage and high current rectification system according to claim 5, characterized in that: The analysis module is further used to analyze the reasons for the unqualified rectification of the current terminal based on the voltage signal measured by the detection module, including: The analysis module obtains the voltage waveform, The analysis module determines that the transformer is unqualified based on the voltage waveform, or determines that the circuit layout is unqualified.

8. The intelligent high voltage and high current rectifier system according to claim 7, characterized in that: The analysis module is also used to reduce the number of turns of the primary coil of the transformer based on the difference between the current and the first preset current when the transformer is determined to be unqualified, wherein: The amount of reduction in the number of turns is positively correlated with the difference.

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