Universal power supply device and control method applied to same

Abstract

The invention relates to the technical field of power supply, in particular to a universal power supply device and a control method applied to the device, and the device comprises a control module, a switching module, a conversion unit and a first information acquisition module; the first information acquisition module is used for acquiring equipment information and transmitting the equipment information to the control module; the control module is used for outputting first control information and second control information based on the equipment information; the conversion unit is used for switching to an alternating current mode or a direct current mode based on the first control information; and the switching module is used for switching to an alternating current module or a direct current mode based on the second control information. According to the invention, the power supply part has universality, and automatic adjustment is realized.

Description

Technical Field

[0001] The present application relates to the technical field of power supply, and in particular to a universal power supply device and a control method applied to the device. Background Art

[0002] With the development of electronic technology, electrical energy is required in most scenarios to enable devices, equipment, etc. to work properly.

[0003] Taking the electric arc furnace as an example, the electric arc furnace has the advantages of effectively removing impurities such as sulfur and phosphorus and easy to control the furnace temperature. Compared with other steelmaking furnaces, the process is more flexible. In the related technology, the power supply for the electric arc furnace is divided into two power supply methods: AC power supply and DC power supply. AC power supply generally uses a transformer to directly supply power, while DC power supply is supplied through SCR controlled rectification or IGBT chopping voltage regulation. The two power supply methods have different principles and cannot be universal. As a result, when the electric arc furnace is interchangeable between DC power supply and AC power supply, the power supply part needs to be completely replaced, which requires huge transformation costs. Summary of the invention

[0004] In order to enable the power supply part to be universal and realize autonomous regulation, the present application provides a universal power supply device and a control method applied to the device.

[0005] In the first aspect, the present application provides a universal power supply device adopting the following technical solution: A universal power supply device comprises a control module, a switching module, a conversion unit, and a first information acquisition module; The first information acquisition module is used to acquire device information and transmit the device information to the control module; The control module is used to output first control information and second control information based on the device information; The conversion unit is used to switch the mode based on the first control information; The switching module is used to switch the mode based on the second control information; The analog module is used to obtain the model information input by the user, filter the historical information based on the model information, determine whether there is a historical model with a similarity higher than a preset value, and if so, obtain similar device information of the historical model; The assigning module is used to assign the similar device information to the device information and execute the steps of outputting the first control information and the second control information based on the device information.

[0006] By adopting the above technical solution, the first information acquisition module can obtain the device information, that is, obtain the relevant information of the electrical equipment, and then transmit the device information to the control module. Based on the device information, the control module outputs the first control information and the second control information, and uses the first control information to control the action of the switching unit, and uses the second control information to control the action of the switching module. By using the acquired device information, the power supply mode of the device is identified, that is, whether the device needs AC power supply or DC power supply is obtained. The control module outputs control information based on the device information, that is, based on the power supply mode, so that the conversion unit and the switching module are switched to the corresponding output module, so as to supply power to the device normally so that the device can work. By using the method of autonomously acquiring device information, the corresponding switching of power supply is realized, and there is universality of power supply, which can adapt to different power supply requirements, and the method of autonomous control switching also improves automation and intelligence, realizes autonomous adjustment, reduces manual operation, and improves efficiency. At the same time, when the device information cannot be automatically acquired, the user can manually enter the model for screening, so as to control based on the device information with high similarity.

[0007] Optional, including The second information acquisition module is used to obtain the power supply information of the device in real time; The third information acquisition module is used to acquire preset requirements based on the device information A first judgment module, used to judge whether the device power supply information meets the preset requirements, and if the device power supply information does not meet the preset requirements, transfer to the first information output module; The first information output module is used to send a stop working signal to the control module.

[0008] By adopting the above technical solution, the second information acquisition module obtains the equipment power supply information in real time, that is, the relevant information in the power supply process of the equipment, such as voltage, current, etc., and then the third information acquisition module obtains the preset requirements based on the equipment information, and then uses the first judgment module to judge whether the equipment power supply information meets the preset requirements, that is, judge whether the real-time voltage and other information meets the preset requirements. If it does not meet the preset requirements, it will be transferred to the first information output module, and the first information output module will be used to output a stop working signal to the control module, so that the control module controls the conversion unit to stop working, that is, stop supplying power to the electrical equipment. Since the real-time power supply situation does not meet the preset requirements, it may cause damage to the electrical equipment, so it is necessary to stop the power supply in time, and in this process, automatic monitoring can be achieved.

[0009] Optional, including An information recording module, used for intercepting the first control information before sending a stop working signal to the control module; A second judgment module, configured to judge whether the first control information has a deviation value based on the preset requirement; if the first control information has the deviation value, transfer to a second information output module; The second information output module is used to output software error prompt information.

[0010] By adopting the above technical solution, before sending a stop working signal to the control module, the information recording module intercepts the first control information, and then the second judgment module judges whether there is a deviation value in the first control information based on the preset requirements, that is, judges whether there is a problem in the software program, which causes the equipment power supply information to not meet the preset requirements. If there is a deviation value in the first control information, it is transferred to the second information output module, and the second information output module outputs software error prompt information, thereby prompting the staff.

[0011] Optionally, when the first control information does not have a deviation value, it includes A first acquisition module, configured to acquire a rated value based on the device information when the first control information does not have a deviation value; A calculation module, used for calculating the difference between the rated value and the power supply information of the device; A third judgment module is used to judge whether the difference value belongs to a preset range; if the difference value belongs to the preset range, the process is transferred to an adjustment module; The adjustment module is used to send an adjustment signal to the control module based on the difference, so that the control module adjusts the first control information output.

[0012] By adopting the above technical solution, when there is no deviation value in the first control information, the first acquisition module obtains the rated value based on the device information, and then the calculation module calculates the difference based on the rated value and the first control information. The deviation caused at this time may be due to the impact of the environment on the hardware, resulting in a deviation. Therefore, the calculation module calculates the difference between the rated value and the device power supply information, and then the third judgment module determines whether the difference belongs to the preset range, that is, whether the deviation is too large. If the difference belongs to the preset range, it is determined that the deviation is within the adjustable range at this time, that is, although the environment has affected the hardware to a certain extent, the degree of influence is acceptable, so the adjustment module sends the adjustment module to the control module based on the difference, so that the control module adjusts the output first control information, thereby adjusting the device power supply information, and finally making the power supply meet the needs of the electrical equipment. It can be judged according to the actual situation. In the case of excluding software errors, it is determined that it will be affected by the environment, and the degree of influence is not very large. At this time, the output of the conversion unit can be adjusted automatically based on the judgment result to meet the needs of the electrical equipment, achieving high automation and intelligence, and improving processing efficiency.

[0013] Optional, including An adjustment module, configured to adjust the first control information according to the preset requirement to obtain first control sub-information; An output module, configured to output the first control sub-information to control the conversion unit; The fourth information acquisition module is also used to obtain the device power supply information in real time; The fourth judgment module is used to judge whether the power supply information of the device meets the preset requirements; if the power supply information of the device does not meet the preset requirements, it is transferred to the third information output module; The third information output module is used to output hardware damage prompt information.

[0014] Optionally, the conversion unit includes three full-bridge modules; the control ends of the switching module and the three full-bridge modules are all electrically connected to the control module, the output ends of the three full-bridge modules are all connected to the input end of the switching module, the first output end of the switching module is used to output alternating current, and the second output end of the switching module is used to output direct current.

[0015] By adopting the above technical solution, when the control module controls the switching module to switch to the first output terminal output, the control module simultaneously controls the full-bridge module to work according to the established program of AC output. At this time, the first output terminal outputs AC power to be suitable for the arc furnace that requires AC power supply. If the arc furnace requires DC power supply, the control module is used to control the switching module to switch to the second output terminal output, and at the same time control the full-bridge module to work according to the established program of DC output, so that the second output terminal outputs DC power to meet the DC power supply demand of the arc furnace. Compared with the related technology, it can freely switch between DC output and AC output, and the power supply has universality, which meets the different power supply requirements of the arc furnace and avoids the huge transformation cost when the AC and DC power supply schemes of the arc furnace are interchanged. And by using the full-bridge module, the output frequency can be adjusted during AC output, and the phase angle can also be adjusted.

[0016] Optionally, the full-bridge module includes an insulated gate bipolar transistor D1, an insulated gate bipolar transistor D2, an insulated gate bipolar transistor D3, an insulated gate bipolar transistor D4 and a capacitor C1, one end of the capacitor C1 is connected to the collector of the insulated gate bipolar transistor D1, the collector of the insulated gate bipolar transistor D1 is connected to the collector of the insulated gate bipolar transistor D2, the emitter of the insulated gate bipolar transistor D1 is connected to the collector of the insulated gate bipolar transistor D3, the emitter of the insulated gate bipolar transistor D3 is connected to the other end of the capacitor C1, and the insulated gate bipolar transistor D2 is connected to the collector of the insulated gate bipolar transistor D3. The emitter of the insulated gate bipolar transistor D3 is connected to the emitter of the insulated gate bipolar transistor D4, the collector of the insulated gate bipolar transistor D4 is connected to the emitter of the insulated gate bipolar transistor D2, the collector of the insulated gate bipolar transistor D1 and the emitter of the insulated gate bipolar transistor D3 are both connected to the input end of the full-bridge module, the input end of the full-bridge module is used to connect to an external power supply, the emitter of the insulated gate bipolar transistor D1 is also connected to the first output end A1 of the full-bridge module, and the emitter of the insulated gate bipolar transistor D2 is also connected to the second output end A2 of the full-bridge module.

[0017] By adopting the above technical solution and using insulated gate bipolar transistors to construct a full-bridge module, the characteristics of higher withstand voltage and crossover conduction loss of the insulated gate bipolar transistors can be utilized to improve the circuit performance.

[0018] Optionally, the three full-bridge modules are respectively used as the first full-bridge module, the second full-bridge module and the third full-bridge module. When the switching module is switched to the AC mode, the first output terminal A1 of the first full-bridge module is short-circuited with the second output terminal B2 of the second full-bridge module, the second output terminal A2 of the first full-bridge module is short-circuited with the first output terminal C1 of the third full-bridge module, the first output terminal B1 of the second full-bridge module is short-circuited with the second output terminal C2 of the third full-bridge module, the second output terminal A2 of the first full-bridge module is connected to the first output terminal X1 of the switching module, the second output terminal B2 of the second full-bridge module is connected to the first output terminal X2 of the switching module, and the second output terminal C2 of the third full-bridge module is connected to the first output terminal X3 of the switching module.

[0019] Optionally, the three full-bridge modules are respectively used as the first full-bridge module, the second full-bridge module and the third full-bridge module. When the switching module is switched to the DC mode, the first output terminal A1 of the first full-bridge module and the second output terminal A2 of the first full-bridge module are short-circuited, the first output terminal B1 of the second full-bridge module and the second output terminal B2 of the second full-bridge module are short-circuited, the first output terminal C1 of the third full-bridge module and the second output terminal C2 of the third full-bridge module are short-circuited, the third output terminal A3 of the first full-bridge module, the third output terminal B3 of the second full-bridge module and the third output terminal C3 of the third full-bridge module are short-circuited, the first output terminal A1 of the first full-bridge module is connected to the second output terminal Y1 of the switching module, the first output terminal B1 of the second full-bridge module is connected to the second output terminal Y1 of the switching module, the first output terminal C1 of the third full-bridge module is connected to the second output terminal Y1 of the switching module, and the third output terminal A3 of the first full-bridge module is also connected to the second output terminal Y2 of the switching module.

[0020] In a second aspect, a universal power supply device control method provided in the present application adopts the following technical solution: A universal power supply device control method is applied to a universal power supply device as described in the first aspect: Get control instructions; Determine whether the control instruction is an AC switching instruction; If the control instruction is the switching AC instruction, the switching module is controlled to switch to the AC mode, and the full-bridge module is also controlled to switch to the AC mode, so that the first output end of the switching module outputs three-phase AC power; If the control instruction is not an AC switching instruction, determining whether the control instruction is a DC switching instruction; If the control instruction is a DC switching instruction, the switching module is controlled to switch to the DC mode, and the full-bridge module is also controlled to switch to the DC mode, so that the second output terminal of the switching module outputs DC power.

[0021] Optionally, after the control switching module is switched to the AC mode and the full-bridge module is also switched to the AC mode, the method further includes: Determining whether an adjustment instruction is received; If an adjustment instruction is received, the operating condition of the full-bridge module is adjusted based on the adjustment instruction.

[0022] Optionally, the controlling the switching module to switch to the AC mode and simultaneously controlling the full-bridge module to switch to the AC mode include: The control module outputs a first frequency signal to control the insulated gate bipolar transistor D1 and the insulated gate bipolar transistor D2, and adjusts the duty cycle based on the current demand; the control module outputs a second frequency signal to control the insulated gate bipolar transistor D3 and the insulated gate bipolar transistor D4 to work alternately; The controlling the switching module to switch to the DC mode and simultaneously controlling the full-bridge module to switch to the DC mode includes: The control module controls the insulated gate bipolar transistor D1 and the insulated gate bipolar transistor D2 to perform chopping, and the insulated gate bipolar transistor D3 and the insulated gate bipolar transistor D4 do not operate for freewheeling.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: The first information acquisition module can acquire device information, that is, acquire relevant information about the electrical equipment, and then transmit the device information to the control module. Based on the device information, the control module outputs first control information and second control information, and uses the first control information to control the action of the switching unit, and uses the second control information to control the action of the switching module. By using the acquired device information, the power supply mode of the device can be identified, that is, whether the device requires AC power supply or DC power supply. The control module outputs control information based on the device information, that is, based on the power supply mode, so that the conversion unit and the switching module are switched to the corresponding output module, thereby supplying power to the device normally and making the device work. By autonomously acquiring device information to achieve corresponding switching of power supply, there is universality of power supply, which can adapt to different power supply needs, and the autonomous control switching method also improves automation and intelligence, realizes autonomous adjustment, reduces manual operation, and improves efficiency; When the control module controls the switching module to switch to the first output terminal, the control module also controls the full-bridge module to work according to the established program of AC output. At this time, the first output terminal outputs AC power to suit the arc furnace that requires AC power supply. If the arc furnace requires DC power supply, the control module controls the switching module to switch to the second output terminal, and at the same time controls the full-bridge module to work according to the established program of DC output, so that the second output terminal outputs DC power to meet the DC power supply requirements of the arc furnace. Compared with related technologies, it can freely switch between DC output and AC output to meet the different needs of the arc furnace, avoiding the huge transformation cost when the AC and DC power supply schemes of the arc furnace are interchanged. And by using the full-bridge module, the output frequency can be adjusted during AC output, and the phase angle can also be adjusted; Using insulated gate bipolar transistors to construct a full-bridge module can take advantage of the higher withstand voltage and crossover loss characteristics of the insulated gate bipolar transistors to achieve better circuit performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a connection block diagram of the entire embodiment.

[0025] Figure 2 4 is a connection block diagram of the conversion unit of this embodiment.

[0026] Figure 3 It is the equivalent circuit diagram of the AC mode of this embodiment.

[0027] Figure 4 is the equivalent circuit diagram of the DC mode of this embodiment.

[0028] Explanation of reference numerals: 1. control module; 2. switching module; 3. full-bridge module. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The present application embodiment discloses a universal power supply device. Figure 1 , a universal power supply device comprises a control module 1, a switching module 2, a conversion unit and a first information acquisition module; A first information acquisition module, used to acquire device information and transmit the device information to the control module; A control module, configured to output first control information and second control information based on device information; A conversion unit, configured to switch the mode based on the first control information; A switching module, configured to switch the mode based on the second control information; The analog module is used to obtain the model information input by the user, filter the historical information based on the model information, determine whether there is a historical model with a similarity higher than a preset value, and if so, obtain similar device information of the historical model; The assigning module is used to assign the similar device information to the device information and execute the steps of outputting the first control information and the second control information based on the device information.

[0031] The device information of the electrical equipment is acquired by using the first information acquisition module, and the device information is transmitted to the control module. The control module outputs the first control information and the second control information based on the device information. The device information includes the voltage, current and other requirements of the electrical equipment. The first control information is transmitted to the conversion unit. The conversion unit switches the module based on the first control information. The second control information is transmitted to the switching module. The switching module switches the mode based on the second control information. When the device information cannot be acquired, the historical information can be filtered based on the model input by the user to obtain similar device information with high similarity, and the similar device information is assigned to the device information, so as to perform output control based on the assigned device information.

[0032] For example: when the electrical equipment requires AC power supply, the control module controls the conversion unit to switch to AC mode, thereby outputting AC power. At the same time, the control module controls the switching module to switch to AC mode, thereby switching the connection at the output end of the conversion unit to ensure that the AC power output by the conversion unit can be supplied to the electrical equipment.

[0033] It can automatically switch the power supply mode according to the situation of the power-consuming equipment to adapt to DC or AC requirements.

[0034] Specifically, to calculate the similarity, first, it is necessary to determine whether there is a device belonging to the same type as the model information in the historical information. If so, the historical information of the same type is extracted, and the extracted historical information is used as the selected information. Then, the candidate information with the model most similar to the model information is extracted from the candidate information, and the extracted candidate information is used as the similar information.

[0035] The second information acquisition module is used to obtain the power supply information of the device in real time; The third information acquisition module is used to acquire preset requirements based on the device information A first judgment module, used to judge whether the device power supply information meets the preset requirements, and if the device power supply information does not meet the preset requirements, transfer to the first information output module; The first information output module is used to send a stop working signal to the control module.

[0036] The second information acquisition module acquires the device power supply information in real time. The device power supply information includes the real-time voltage and current in the line, that is, the device power supply information is the actual power situation in the line. The third information acquisition module acquires the preset requirements based on the device information, and then the first judgment module judges whether the device power supply information meets the preset requirements. If the device power supply information does not meet the preset requirements, the first information output module sends a stop working signal to the control module to make the control module control the conversion unit to stop working, thereby stopping the power supply. Since it does not meet the preset requirements, it may damage the electrical equipment, so the power supply is stopped. In this process, no human operation is required, and it can be judged and controlled independently, and the power supply can be stopped more timely, reducing the possibility of damage to the electrical equipment.

[0037] An information recording module, used for intercepting the first control information before sending a stop working signal to the control module; A second judgment module, configured to judge whether the first control information has a deviation value based on the preset requirement; if the first control information has the deviation value, transfer to a second information output module; The second information output module is used to output software error prompt information.

[0038] Before sending a stop working signal to the control module, the information recording module intercepts the first control information, and then the second judgment module determines whether there is a deviation value in the first control information based on preset requirements. If there is a deviation value in the first control information, the second information output module outputs a software error prompt to prompt the staff the reason for the deviation.

[0039] A first acquisition module, configured to acquire a rated value based on the device information when the first control information does not have a deviation value; A calculation module, used for calculating the difference between the rated value and the power supply information of the device; A third judgment module is used to judge whether the difference value belongs to a preset range; if the difference value belongs to the preset range, the process is transferred to an adjustment module; The adjustment module is used to send an adjustment signal to the control module based on the difference, so that the control module adjusts the first control information output.

[0040] When the first control information does not have a deviation value, the first acquisition module acquires the rated value based on the device information, and then the calculation module calculates the difference between the rated value and the device power supply information, and the third judgment module judges whether the difference belongs to the preset range. If the difference belongs to the preset range, the adjustment module sends an adjustment signal to the control module based on the difference, so that the control module adjusts the output of the first control information, and then adjusts the output of the conversion unit. In the case of excluding software problems, it is determined that the hardware is affected by the environment, and the output can be adjusted autonomously according to the deviation situation.

[0041] When the first control information has a deviation value, it includes: An adjustment module, configured to adjust the first control information according to the preset requirement to obtain first control sub-information; An output module, configured to output the first control sub-information to control the conversion unit; The fourth information acquisition module is also used to obtain the device power supply information in real time; The fourth judgment module is used to judge whether the power supply information of the device meets the preset requirements; if the power supply information of the device does not meet the preset requirements, it is transferred to the third information output module; The third information output module is used to output hardware damage prompt information.

[0042] The conversion unit includes three full-bridge modules 3, the input ends of the three full-bridge modules 3 are all used to connect to an external power supply, the control ends of the three full-bridge modules 3 are all connected to the control module 1, the output ends of the three full-bridge modules 3 are all connected to the input end of the switching module 2, the first output end of the switching module 2 is used to output alternating current, and the second output end of the switching module 2 is used to output direct current.

[0043] The three full-bridge modules 3 are respectively used as the first full-bridge module, the second full-bridge module and the third full-bridge module. The component composition and the connection between the components of the three full-bridge modules are the same, so the first full-bridge module is taken as an example for description here.

[0044] The first full-bridge module includes an insulated gate bipolar transistor D1, an insulated gate bipolar transistor D2, an insulated gate bipolar transistor D3, an insulated gate bipolar transistor D4 and a capacitor C1, one end of the capacitor C1 is connected to the collector of the insulated gate bipolar transistor D1, the collector of the insulated gate bipolar transistor D1 is connected to the collector of the insulated gate bipolar transistor D2, the emitter of the insulated gate bipolar transistor D1 is connected to the collector of the insulated gate bipolar transistor D3, the emitter of the insulated gate bipolar transistor D3 is connected to the other end of the capacitor C1, and the insulated gate bipolar transistor D2 is connected to the collector of the insulated gate bipolar transistor D3. The emitter of transistor D3 is connected to the emitter of insulated gate bipolar transistor D4, the collector of insulated gate bipolar transistor D4 is connected to the emitter of insulated gate bipolar transistor D2, the collector of insulated gate bipolar transistor D1 and the emitter of insulated gate bipolar transistor D3 are both connected to the input end of the full-bridge module, the input end of the full-bridge module is used to connect to an external power supply, the emitter of insulated gate bipolar transistor D1 is also connected to the first output end A1 of the first full-bridge module, and the emitter of insulated gate bipolar transistor D2 is also connected to the second output end A2 of the first full-bridge module.

[0045] The emitter of the insulated gate bipolar transistor D5 is also connected to the first output terminal B1 of the second full-bridge module, and the emitter of the insulated gate bipolar transistor D6 is also connected to the second output terminal B2 of the second full-bridge module; the emitter of the insulated gate bipolar transistor D9 is also connected to the first output terminal C1 of the third full-bridge module, and the emitter of the insulated gate bipolar transistor D10 is also connected to the second output terminal C2 of the third full-bridge module.

[0046] Reference Figure 2 When it is necessary to output three-phase alternating current, the control module 1 is used to control the switching module 2 to switch to the first output end, that is, the control module 1 is used to control the switch to the AC mode. The equivalent circuit at this time is: the first output end A1 of the first full-bridge module is short-circuited with the second output end B2 of the second full-bridge module, the second output end A2 of the first full-bridge module is short-circuited with the first output end C1 of the third full-bridge module, the first output end B1 of the second full-bridge module is short-circuited with the second output end C2 of the third full-bridge module, the second output end A2 of the first full-bridge module is connected to the first output end X1 of the switching module, the second output end B2 of the second full-bridge module is connected to the first output end X2 of the switching module, and the second output end C2 of the third full-bridge module is connected to the first output end X3 of the switching module.

[0047] When the control module 1 controls the switching module 2 to switch the AC mode, the control module 1 controls the three full-bridge modules 3 to work according to the established AC output program. At this time, the first output terminal X1, the first output terminal X2 and the first output terminal X3 of the switching module 2 output three-phase AC power, which can be applied to the AC-powered arc furnace. The control module 1 is used to adjust the working conditions of the three full-bridge modules, that is, to adjust the conduction time and sequence of the IGBT in the full-bridge module, so as to realize the functions of adjusting the frequency and adjusting the phase angle. In the embodiment of the present application, the frequency adjustment range is 0-50HZ.

[0048] Reference Figure 3 When direct current needs to be output, the control module 1 is used to control the switching module 2 to switch to the second output end, that is, the control module 1 is used to control the switching to the direct current mode. At this time, the equivalent circuit is: the first output end A1 of the first full-bridge module and the second output end A2 of the first full-bridge module are short-circuited, the first output end B1 of the second full-bridge module and the second output end B2 of the second full-bridge module are short-circuited, the first output end C1 of the third full-bridge module and the second output end C2 of the third full-bridge module are short-circuited, the third output end A3 of the first full-bridge module, the third output end B3 of the second full-bridge module and the third output end C3 of the third full-bridge module are short-circuited, the first output end A1 of the first full-bridge module is connected to the second output end Y1 of the switching module, the first output end B1 of the second full-bridge module is connected to the second output end Y1 of the switching module, the first output end C1 of the third full-bridge module is connected to the second output end Y1 of the switching module, and the third output end A3 of the first full-bridge module is also connected to the second output end Y2 of the switching module.

[0049] The second output terminal Y2 is used to connect to the bottom electrode of the electric arc furnace.

[0050] When the control switching module 2 switches to the DC module, the three full-bridge modules 3 are controlled to work according to the predetermined DC output program. At this time, the second output terminal Y1 and the second output terminal Y2 output DC power, which can be applied to the DC-powered arc furnace. And using the circuit of this embodiment for DC power supply can double the current, thereby improving the power density of the power supply.

[0051] Reactance modules L are provided between the output ends of the three full-bridge modules 3 and the input end of the switching module 2. In this embodiment, the reactance module L is a reactor, which can smooth the current, limit the current change rate, and reduce the possibility of subsequent circuit elements receiving current shock.

[0052] The implementation principle of a universal power supply device in the embodiment of the present application is as follows: when the arc furnace needs AC power supply, the control module 1 is used to control the switching module 2 to switch to AC mode, and the three full-bridge modules 3 are controlled to work according to the established program of outputting AC power, so that the first output end of the switching module 2 outputs three-phase AC power. And the control module 1 can be used to adjust the working condition of the full-bridge module 3, so as to adjust the frequency of the output AC power to meet different frequency requirements.

[0053] When the arc furnace needs DC power supply, the control module 1 controls the switching module 2 to switch to DC mode, and controls the three full-bridge modules 3 to work according to the established DC output program, so that the second output end of the switching module 2 outputs DC power.

[0054] The circuit of this embodiment can realize direct current and three-phase alternating current output, and can be applied to different power supply conditions of electric arc furnaces. Compared with the related art, it avoids the situation that huge transformation costs are required when the electric arc furnace switches between AC and DC power supply schemes.

[0055] The embodiment of the present application also discloses a universal power supply device control method. A universal power supply device control method includes: Get control instructions; Determine whether the control instruction is an AC switching instruction; If the control instruction is an AC switching instruction, the switching module is controlled to switch to the AC mode, and the full-bridge module is also controlled to switch to the AC mode, so that the first output terminal of the switching module outputs three-phase AC power; If the control instruction is not an AC switching instruction, determining whether the control instruction is a DC switching instruction; If the control instruction is a DC switching instruction, the switching module is controlled to switch to the DC mode, and the full-bridge module is also controlled to switch to the DC mode, so that the second output terminal of the switching module outputs DC power.

[0056] The control module obtains the control instruction, which is input by the staff. Then the control module determines whether the control instruction is an AC switching instruction, that is, whether it is necessary to switch to the AC mode. If the control instruction is an AC switching instruction, the control module sends a control electrical signal to the switching module and the three full-bridge modules, thereby controlling the three full-bridge modules to work in the AC output mode, and controlling the switching module to switch to the first output terminal output. At this time, the first output terminal outputs three-phase AC.

[0057] After the control switching module is switched to the AC mode and the control full-bridge module is also switched to the AC mode, the control module determines whether an adjustment instruction is received. If an adjustment instruction is received, the control module adjusts the working conditions of the three full-bridge modules based on the adjustment instruction to achieve the frequency of the three-phase AC power output by the first output end.

[0058] If the control instruction is not a switching AC instruction, the control module determines whether the control instruction is a switching DC instruction, that is, determines whether it is necessary to switch to the DC mode. If the control instruction is a switching DC instruction, the control module sends a control electrical signal to the switching module and the three full-bridge modules, thereby controlling the three full-bridge modules to work in a DC output mode, and controlling the switching module to switch to the second output terminal output, and the second output terminal outputs DC power.

[0059] After the control switching module is switched to the AC mode and the full-bridge module is also switched to the AC mode, it also includes: judging whether an adjustment instruction is received; if the adjustment instruction is received, adjusting the working condition of the full-bridge module based on the adjustment instruction.

[0060] In the AC mode, the control module determines whether an adjustment instruction is received. If an adjustment instruction is received, the control module adjusts the working condition of the full-bridge module based on the adjustment instruction to adjust the phase angle, frequency, etc. to meet the use requirements.

[0061] When switched to AC mode, the control module outputs a first frequency signal to control the insulated gate bipolar transistor D1 and the insulated gate bipolar transistor D2, and adjusts the duty cycle based on current demand; the control module outputs a second frequency signal to control the insulated gate bipolar transistor D3 and the insulated gate bipolar transistor D4 to work alternately.

[0062] Specifically, taking the first full-bridge module as an example, after switching to the AC mode, the first full-bridge module works as an H-bridge. For example: the control module outputs a first frequency signal, and the first frequency signal can be 2.5k Hz, that is, the insulated gate bipolar transistor D1 and the insulated gate bipolar transistor D2 respectively output current at a frequency of 2.5k Hz, and during the current output process, the duty cycle can be adjusted according to the current demand. The control module also outputs a second frequency signal, and the second frequency signal can be 50 Hz, that is, the insulated gate bipolar transistor D3 and the insulated gate bipolar transistor D4 respectively work at a frequency of alternate phase. The three groups of full-bridge modules work in combination, and the switching module is switched to the AC mode, so that AC output and regulation can be achieved.

[0063] When switched to the DC mode, the control module controls the IGBT D1 and the IGBT D2 to perform chopping, and the IGBT D3 and the IGBT D4 do not operate for freewheeling.

[0064] Specifically, taking the first full-bridge module as an example, after switching to the DC mode, the control module controls the insulated gate bipolar transistor D1 and the insulated gate bipolar transistor D2 to perform chopping operation. The control module controls the insulated gate bipolar transistor D1 and the insulated gate bipolar transistor D2 to operate at a frequency of 2.5 kHz respectively, and dynamically adjusts the duty cycle based on the current demand, thereby realizing the regulation of the output current. The insulated gate bipolar transistor D3 and the insulated gate bipolar transistor D4 do not operate. The insulated gate bipolar transistor D3 and the insulated gate bipolar transistor D4 use their own body diodes for freewheeling. The three groups of full-bridge modules work in combination, and the switching module switches to the DC mode to achieve DC output.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A universal power supply device, characterized in that: It comprises a control module (1), a switching module (2), a conversion unit, a first information acquisition module, an analogy module, and an assignment module; A judgment module, used for judging whether there is device information input, if there is the device information input, then transferring to the first information acquisition module; if there is no device information input, then transferring to the analogy module; The first information acquisition module is used to acquire device information and transmit the device information to the control module; The control module is used to output first control information and second control information based on the device information; The conversion unit is used to switch the mode based on the first control information; The switching module is used to switch the mode based on the second control information; The analog module is used to obtain the model information input by the user, filter the historical information based on the model information, determine whether there is a historical model with a similarity higher than a preset value, and if so, obtain similar device information of the historical model; The assigning module is used to assign the similar device information to the device information, and execute the steps of outputting the first control information and the second control information based on the device information.

2. A universal power supply device according to claim 1, characterized in that: include The second information acquisition module is used to obtain the power supply information of the device in real time; The third information acquisition module is used to acquire preset requirements based on the device information A first judgment module, used to judge whether the device power supply information meets the preset requirements, and if the device power supply information does not meet the preset requirements, transfer to the first information output module; The first information output module is used to send a stop working signal to the control module.

3. A universal power supply device according to claim 2, characterized in that: include An information recording module, used for intercepting the first control information before sending a stop working signal to the control module; A second judgment module, used for judging whether the first control information has a deviation value based on the preset requirement; If the first control information has the deviation value, it is transferred to the second information output module; The second information output module is used to output software error prompt information.

4. A universal power supply device according to claim 3, characterized in that: include A first acquisition module, configured to acquire a rated value based on the device information when the first control information does not have a deviation value; A calculation module, used for calculating the difference between the rated value and the power supply information of the device; A third judgment module is used to judge whether the difference falls within a preset range; If the difference falls within the preset range, the process is transferred to the adjustment module; The adjustment module is used to send an adjustment signal to the control module based on the difference, so that the control module adjusts the first control information output.

5. A universal power supply device according to claim 3, characterized in that: include An adjustment module, configured to adjust the first control information according to the preset requirement to obtain first control sub-information; An output module, configured to output the first control sub-information to control the conversion unit; The fourth information acquisition module is also used to obtain the device power supply information in real time; The fourth judgment module is used to judge whether the power supply information of the device meets the preset requirements; if the power supply information of the device does not meet the preset requirements, it is transferred to the third information output module; The third information output module is used to output hardware damage prompt information.

6. A universal power supply device according to claim 1, characterized in that: The conversion unit comprises three full-bridge modules (3); the control ends of the switching module (2) and the three full-bridge modules (3) are all electrically connected to the control module (1); the output ends of the three full-bridge modules (3) are all connected to the input end of the switching module (2); the first output end of the switching module (2) is used to output alternating current, and the second output end of the switching module (2) is used to output direct current; The full-bridge module (3) comprises an insulated gate bipolar transistor D1, an insulated gate bipolar transistor D2, an insulated gate bipolar transistor D3, an insulated gate bipolar transistor D4 and a capacitor C1, one end of the capacitor C1 is connected to the collector of the insulated gate bipolar transistor D1, the collector of the insulated gate bipolar transistor D1 is connected to the collector of the insulated gate bipolar transistor D2, the emitter of the insulated gate bipolar transistor D1 is connected to the collector of the insulated gate bipolar transistor D3, the emitter of the insulated gate bipolar transistor D3 is connected to the other end of the capacitor C1, and the insulated gate bipolar transistor D2 is connected to the collector of the insulated gate bipolar transistor D3. The emitter of the insulated gate bipolar transistor D3 is connected to the emitter of the insulated gate bipolar transistor D4, the collector of the insulated gate bipolar transistor D4 is connected to the emitter of the insulated gate bipolar transistor D2, the collector of the insulated gate bipolar transistor D1 and the emitter of the insulated gate bipolar transistor D3 are both connected to the input end of the full-bridge module, the input end of the full-bridge module is used to connect to an external power supply, the emitter of the insulated gate bipolar transistor D1 is also connected to the first output end A1 of the full-bridge module, and the emitter of the insulated gate bipolar transistor D2 is also connected to the second output end A2 of the full-bridge module.

7. A universal power supply device according to claim 1, characterized in that: The three full-bridge modules (3) are respectively used as a first full-bridge module, a second full-bridge module and a third full-bridge module; when the switching module (2) is switched to an AC mode, the first output end A1 of the first full-bridge module is short-circuited with the second output end B2 of the second full-bridge module, the second output end A2 of the first full-bridge module is short-circuited with the first output end C1 of the third full-bridge module, the first output end B1 of the second full-bridge module is short-circuited with the second output end C2 of the third full-bridge module, the second output end A2 of the first full-bridge module is connected to the first output end X1 of the switching module (2), the second output end B2 of the second full-bridge module is connected to the first output end X2 of the switching module (2), and the second output end C2 of the third full-bridge module is connected to the first output end X3 of the switching module (2).

8. A universal power supply device according to claim 2, characterized in that: When the switching module (2) switches to the DC mode, the first output end A1 of the first full-bridge module and the second output end A2 of the first full-bridge module are short-circuited, the first output end B1 of the second full-bridge module and the second output end B2 of the second full-bridge module are short-circuited, the first output end C1 of the third full-bridge module and the second output end C2 of the third full-bridge module are short-circuited, the third output end A3 of the first full-bridge module, the third output end B3 of the second full-bridge module and the third output end C3 of the third full-bridge module are short-circuited, the first output end A1 of the first full-bridge module is connected to the second output end Y1 of the switching module (2), the first output end B1 of the second full-bridge module is connected to the second output end Y1 of the switching module (2), the first output end C1 of the third full-bridge module is connected to the second output end Y1 of the switching module (2), and the third output end A3 of the first full-bridge module is also connected to the second output end Y2 of the switching module (2).

9. A method for controlling a universal power supply device, applied to a universal power supply device as claimed in any one of claims 4 to 7, characterized in that: Get control instructions; Determine whether the control instruction is an AC switching instruction; If the control instruction is the switching AC instruction, the switching module is controlled to switch to the AC mode, and the full-bridge module is also controlled to switch to the AC mode, so that the first output end of the switching module outputs three-phase AC power; If the control instruction is not an AC switching instruction, determining whether the control instruction is a DC switching instruction; If the control instruction is a DC switching instruction, the switching module is controlled to switch to the DC mode, and the full-bridge module is also controlled to switch to the DC mode, so that the second output terminal of the switching module outputs DC power.

10. A universal power supply device control method according to claim 9, characterized in that: The control switching module is switched to the AC mode, and the control full-bridge module is also switched to the AC mode, including: The control module outputs a first frequency signal to control the insulated gate bipolar transistor D1 and the insulated gate bipolar transistor D2, and adjusts the duty cycle based on the current demand; the control module outputs a second frequency signal to control the insulated gate bipolar transistor D3 and the insulated gate bipolar transistor D4 to work alternately; The controlling the switching module to switch to the DC mode and simultaneously controlling the full-bridge module to switch to the DC mode includes: The control module controls the insulated gate bipolar transistor D1 and the insulated gate bipolar transistor D2 to perform chopping, and the insulated gate bipolar transistor D3 and the insulated gate bipolar transistor D4 do not operate for freewheeling.

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