CN117150732A - Frequency converter power unit waterway design method and structure based on crimping device - Google Patents
Frequency converter power unit waterway design method and structure based on crimping device Download PDFInfo
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Abstract
The invention provides a frequency converter power unit waterway design method and structure based on a crimping device. Comprising the following steps: preliminarily designing a waterway connection topological structure of the power unit; calculating the pressure loss and flow characteristics of the water-cooled radiator and each water pipe; equivalent water cooling radiator and electric characteristics of each water pipe according to pressure loss and flow characteristics of the water cooling radiator and each water pipe; selecting an equivalent electrical model and building a circuit connection topological structure simulation model; obtaining a voltage and current simulation result; equivalently obtaining the pressure loss result of each parallel branch of the waterway design; setting necking, designing corresponding necking parameters according to the pressure loss results of all the parallel branches, and balancing the waterway flow of all the parallel branches; and constructing a complete waterway model of the power unit, and checking the flow balance and the total pressure loss of the waterway inlet and outlet of each parallel branch.
Description
Technical Field
The invention relates to the technical field of high-voltage frequency converters, in particular to a frequency converter power unit waterway design method and structure based on a crimping device.
Background
The high-voltage frequency converter is widely applied to the field of industrial electric traction, plays roles in energy conservation and environmental protection, and with the development of the modern industry and the power electronics field, the voltage and current level of the frequency converter are increasingly demanded. The power unit is a core component of the high-voltage frequency converter, and the voltage and current output capacity of the power unit directly determines the power class of the frequency converter equipment. Power semiconductor devices (including IGBTs and diodes) are the core components of power cells, whose heat dissipation design directly affects the output capability and operational reliability of the power cells. According to the package classification, power semiconductor devices are classified into a soldering type device and a crimping type device, the heat dissipation surface of the soldering type device is mostly ground potential, all devices are usually mounted on the same water-cooling radiator by a heat dissipation design, and the water-cooling design is relatively simple, but the output capacity of a power unit is limited due to the single-sided heat dissipation. The crimping type device adopts a double-sided heat dissipation mode, has the advantages of sealing, explosion prevention and the like, and is widely applied to the field of high-power electric power equipment, but because the crimping type device needs to adopt a component type design, each device needs an independent water-cooling radiator, the potential is not fixed, and the waterway design is complex. In view of the fact that the high-voltage high-capacity frequency converter uses more types and numbers of power devices, including IGBT, fast recovery diode and rectifier diode, the waterway design needs to consider factors such as flow distribution of each waterway and total waterway pressure loss, and design difficulty is higher.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a waterway design method and a waterway design structure of a frequency converter power unit based on a crimping device.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a frequency converter power unit waterway design method based on a crimping device is characterized in that the device is a power semiconductor device, a waterway connection structure of the power unit is designed by the method, the connection structure of the waterway is equivalent to a circuit connection structure, circuit simulation is carried out by utilizing the equivalent circuit structure, necking parameters of the corresponding waterway position are determined according to simulation data, and a flow balancing result of the waterway is realized.
The method comprises the following steps:
step 1: developing a preliminary device arrangement scheme and a power unit waterway connection topological structure design according to the actual electrical topology of the power unit and the heat loss calculation result of the power semiconductor device;
step 2: calculating the pressure loss and flow characteristics of the water-cooled radiator and each water pipe;
step 3: the electric characteristics of the water cooling radiator and each water pipe are equivalent according to the pressure loss and flow characteristics of the water cooling radiator and each water pipe, wherein the electric characteristics comprise current and voltage characteristics; equivalent flow characteristics to current characteristics and equivalent pressure loss characteristics to voltage characteristics;
step 4: selecting an equivalent electric model and building a circuit connection topology simulation model according to the equivalent electric characteristics of each water-cooling radiator and each water pipe and the connection topology of each parallel branch waterway;
step 5: obtaining a voltage and current simulation result according to the constructed circuit connection topological structure simulation model;
step 6: equivalently obtaining the pressure loss results of all parallel branches of the waterway design according to the obtained voltage and current simulation results;
step 7: setting necking down on waterways of other parallel branches by taking the branch with the largest pressure loss in each parallel branch as a reference, designing corresponding necking down parameters according to the pressure loss result of each parallel branch, and balancing the waterway flow of each parallel branch;
step 8: and constructing a complete waterway model of the power unit, checking flow balance of each parallel branch, and checking total pressure loss of a waterway inlet and a waterway outlet of the power unit.
In the step 1, the waterway of the power unit is designed into a plurality of parallel branches, and each parallel branch is formed by connecting water-cooling radiators of a plurality of power semiconductor devices in series.
Further, in the process of equivalent of the connection structure of the waterway as the connection structure of the circuit, the current source is adopted to simulate the branch flow, the design flow of each parallel branch is the rated flow, the voltage drop of each parallel branch is obtained through circuit simulation, and the voltage drop of each parallel branch is equivalent to the voltage loss of the branch.
Further, in the step 7, the necking design specifically includes: according to the built equivalent circuit simulation models of different parallel waterways, the voltage difference, namely the pressure loss, of each parallel branch is obtained through simulation, and the pressure loss difference of each parallel branch is corrected through designing corresponding necking, so that the purpose of balancing the waterway flow is achieved.
Further, in the step 7, in terms of necking parameter design, the method includes the following steps:
1) Firstly, fixing the design length of a necking;
2) Scanning simulation is carried out on the necking with different inner diameters, and a relationship curve between necking pressure loss and inner diameter is obtained;
3) And finding out the inner diameter of the necking corresponding to the pressure loss correction value on the curve, and determining the designed size of the inner diameter of the necking.
The invention also provides a waterway structure designed by the waterway design method of the frequency converter power unit based on the crimping device, wherein the power semiconductor device in the power unit is the crimping power semiconductor device, the waterway structure of the power unit comprises a plurality of parallel branches, each parallel branch is formed by connecting water-cooling radiators of the power semiconductor devices in series, the branch with the largest pressure loss in each parallel branch is taken as a reference, necking is arranged on waterways of other parallel branches, and the necking parameters are finally determined according to the waterway design method of the frequency converter power unit based on the crimping device.
Further, the high-voltage frequency converter power unit is of an uncontrolled rectifying connection H-bridge inversion topological structure, the rectifying side is composed of 6 crimping rectifying diodes, the inversion side is composed of 4 crimping IGBT and 4 crimping fast recovery diodes, 3 devices are independently crimped to form a rectifying diode component, an IGBT component and a freewheel diode component, and a water-cooling radiator is arranged between the upper device and the lower device in the component and between the uppermost end and the lowermost end of the component.
The waterway of the high-voltage frequency converter power unit is designed into 6 parallel waterways, wherein the waterways comprise 5 waterways which pass through the IGBT, the 5 waterways are identical, and each waterway is sequentially connected with the IGBT water-cooling radiator, the flywheel diode water-cooling radiator and the rectifier diode water-cooling radiator to form a serial waterway; the novel energy-saving LED lamp further comprises an independent 1-path waterway, because the number of the rectifier diode water-cooling radiators is different from that of the IGBT water-cooling radiators, the independent 1-path waterway is designed to be a serial waterway formed by connecting the other 2 rectifier diode water-cooling radiators, and necking is arranged on the parallel branch of the independent 1-path waterway.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a crimping device-based frequency converter power unit waterway design method and waterway structure design. By building a complete waterway simulation model, the flow balancing condition of each parallel waterway and the overall waterway characteristic of the power unit are accurately simulated, and the method can be used for the waterway design scheme of the power unit of the tens MW cascade high-voltage frequency converter.
Drawings
FIG. 1 is a flow chart of a waterway design in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of an electrical topology of a power unit, a power semiconductor device, a water-cooled radiator, and a connection busbar according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an embodiment of a water circuit design for a tens of MW power unit embodying the present invention;
FIG. 4 is a finite element simulation software design-based water pipe pressure loss and flow characteristic calculation tool;
FIG. 5 is a diagram showing the equivalent simulation process of the electrical characteristics of the water circuit element according to the present invention;
FIG. 6 shows simulation models and simulation results of equivalent circuits of tens of MW power units in parallel branches designed by the invention;
FIG. 7 is a necking head versus inner diameter curve, in accordance with the present invention;
FIG. 8 is a graph of pressure loss versus flow for a neck of the present invention;
fig. 9 is a circuit simulation model and simulation result of the present invention for an integral water circuit of several tens of MW power units.
In the figure: 1-power semiconductor device 2-water-cooling radiator 3-IGBT crimping component 4-flywheel diode crimping component 5-rectifier diode crimping component 6-1-inlet tube 6-2-outlet tube 6-3-branch water tube 6-4-necking 7-input parameter 8 of operation interface-water tube pressure loss and flow data 9 calculated according to the input parameter-water tube pressure loss and flow curve 10-waterway pressure cloud chart 11-current sensor 12-lookup table module 13-voltage-controlled voltage source 14-one parallel branch 15-another parallel branch 16-parallel branch 14 circuit simulation model 17-parallel branch 15 circuit simulation model 18-equivalent circuit model of parallel branch 14 after adding necking
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in fig. 1-9, a method for designing a waterway of a power unit of a frequency converter based on a crimping device is a power semiconductor device 1, the method designs a waterway connection structure of the power unit, and equivalent the waterway connection structure as a circuit connection structure, performs circuit simulation by using the equivalent circuit structure, determines necking parameters of corresponding waterway positions according to simulation data, and realizes a flow balancing result of the waterway.
The method comprises the following steps:
step 1: developing a preliminary device arrangement scheme and a power unit waterway connection topological structure design according to the actual electric topology of the power unit and the heat loss calculation result of the power semiconductor device 1;
step 2: calculating the pressure loss and flow characteristics of the water-cooled radiator 2 and the water pipes (6-1 to 6-3);
step 3: the electric characteristics of the water-cooled radiator 2 and the water pipes are equivalent according to the pressure loss and flow characteristics of the water-cooled radiator 2 and the water pipes, wherein the electric characteristics comprise current and voltage characteristics; equivalent flow characteristics to current characteristics and equivalent pressure loss characteristics to voltage characteristics;
step 4: selecting an equivalent electric model and building a circuit connection topology simulation model according to the equivalent electric characteristics of each water-cooling radiator 2 and each water pipe and the connection topology of each parallel branch waterway;
step 5: obtaining a voltage and current simulation result according to the constructed circuit connection topological structure simulation model;
step 6: equivalently obtaining the pressure loss results of all parallel branches of the waterway design according to the obtained voltage and current simulation results;
step 7: setting necking 6-4 on waterways of other parallel branches by taking the branch with the largest pressure loss in each parallel branch as a reference, designing corresponding necking 6-4 parameters according to the pressure loss result of each parallel branch, and balancing the waterway flow of each parallel branch;
step 8: and constructing a complete waterway model of the power unit, checking flow balance of each parallel branch, and checking total pressure loss of a waterway inlet and a waterway outlet of the power unit.
Further, in the step 1, the waterway of the power unit is designed into a plurality of parallel branches, and each parallel branch is formed by connecting the water-cooling heat sinks 2 of the plurality of power semiconductor devices 1 in series.
Further, in the process of equivalent of the connection structure of the waterway as the connection structure of the circuit, the current source is adopted to simulate the branch flow, the design flow of each parallel branch is the rated flow, the voltage drop of each parallel branch is obtained through circuit simulation, and the voltage drop of each parallel branch is equivalent to the voltage loss of the branch.
Further, in the step 7, the necking 6-4 design specifically includes: according to the built equivalent circuit simulation models of different parallel waterways, the voltage difference of each parallel branch, namely the pressure loss difference, is obtained through simulation, and the corresponding necking 6-4 is designed to correct the pressure loss difference of each parallel branch, so that the purpose of balancing waterways is achieved.
Further, in the step 7, in terms of designing parameters of the necking 6-4, the method comprises the following steps:
4) Firstly, fixing the design length of the necking 6-4;
5) Scanning simulation is carried out on the necking 6-4 with different inner diameters, and a relation curve between the pressure loss and the inner diameter of the necking 6-4 is obtained;
6) And finding out the inner diameter of the necking corresponding to the pressure loss correction value on the curve, and determining the designed size of the inner diameter of the necking.
The invention also provides a waterway structure designed by the waterway design method of the frequency converter power unit based on the crimping device, wherein the power semiconductor device 1 in the power unit is the crimping power semiconductor device, the waterway structure of the power unit comprises a plurality of parallel branches, each parallel branch is formed by connecting a plurality of water-cooling radiators 2 of the power semiconductor device 1 in series, the branch with the largest pressure loss in each parallel branch is taken as a reference, the waterway of the other parallel branch is provided with a necking 6-4, and the necking 6-4 is finally determined according to the waterway design method of the frequency converter power unit based on the crimping device.
Example 1
As shown in fig. 2, fig. 2 (a) is an electrical topology of a power unit of a high-power frequency converter, and fig. 2 (b) is a power semiconductor device 1, a water-cooled radiator 2 and a connection busbar arrangement diagram, including a three-phase uncontrolled rectifier bridge topology in which ac is converted into dc and an H-bridge inverter topology in which dc is converted into ac. The rectifier bridge is a crimp-type rectifier diode unit 5 composed of 6 crimp-type rectifier diodes, and the inverter H-bridge is a crimp-type IGBT unit 3 composed of crimp-type IGBTs and a crimp-type fast recovery diode unit 4 (serving as a flywheel diode) composed of crimp-type fast recovery diodes. The device with the largest topological loss and heating value is an IGBT, the freewheel diode and the rectifier diode have relatively small loss, and the water-cooling radiator of the IGBT, the freewheel diode and the rectifier diode sequentially form a serial waterway in consideration of the loss of the device, so that the device with the largest loss can radiate heat preferentially. In general, the water resistance and the thermal resistance of the water-cooled radiator 2 are contradictory parameters, in order to give consideration to the good heat dissipation performance of the device and the pressure characteristic of the waterway, the IGBT dissipates heat and selects the water-cooled radiator 2 with smaller thermal resistance and larger water resistance, and the flywheel diode and the rectifier diode dissipates heat and selects the water-cooled radiator 2 with smaller thermal resistance and larger thermal resistance. Each device is electrically connected through the copper busbar, and the arrangement scheme is concise in electrical connection and small in busbar stray inductance.
As shown in fig. 3, the invention designs a power unit waterway diagram and designs 6 parallel waterways, wherein 5 waterways (called IGBT waterways) passing through the IGBT are completely identical, and each waterway is connected with the IGBT water-cooling radiator 2, the flywheel diode water-cooling radiator 2 and the rectifier diode water-cooling radiator 2 in sequence to form a serial waterway. Since the number of the rectifier diode water-cooled radiators 2 is different from the number of the IGBT water-cooled radiators 2, a separate 1-way waterway is designed to connect another 2 rectifier diode water-cooled radiators 2 (this waterway is called a rectifier diode waterway). In order to balance the flow of the IGBT waterway and the rectifying diode waterway, a necking 6-4 is designed on a water inlet main pipe of the rectifying diode waterway, so that the flow of each parallel waterway branch is equal, and the heat dissipation requirement of each branch is met.
As shown in fig. 4, in order to simplify the design flow, a water pipe pressure loss and flow characteristic calculation tool based on finite element simulation software is designed, a pipeline flow physical field algorithm is applied, the design process and the calculation result are packaged into an operation interface, the pressure loss and flow relation of different water pipes can be rapidly obtained, and modeling data is provided for unit waterway simulation. In the figure, 7 is the input parameters of the operation interface, including the length of each section of water pipe, the skew radius of the water pipe, the inner diameter of the water pipe, etc. In the graph 8, the pressure loss and flow data of the water pipe calculated according to the input parameters are shown, and the pressure loss and flow of the water pipe can be modeled by using the data. In the graph 9, the calculated relationship between the water pipe pressure loss and the flow rate is shown. In the figure, 10 is a water path pressure cloud chart under each flow, and the design of the water pipe can be optimized according to the pressure value of each place of the water pipe.
As shown in fig. 5, for the equivalent simulation model of the pressure loss electrical characteristics of the waterway element according to the present invention, since the mathematical relationship between the fluid parameters such as pressure and flow is the same as the mathematical relationship between the electrical parameters such as voltage and current, a circuit model is built to be equivalent to the waterway model, and the pressure loss and flow data of each waterway device (the pressure loss and flow data of the radiator are provided by the manufacturer of the radiator, and the pressure loss and flow data of the water pipe are obtained by the calculation tool designed in fig. 4) are substituted into the look-up table module in fig. 12 to model the pressure loss and flow characteristics of each device. In the figure, 11 is a current sensor, the flow value of the branch is input to a lookup table module 12 by using the current equivalent simulation flow, the lookup table module 12 outputs a corresponding pressure loss value according to the monitored flow value and inputs the pressure loss value to a voltage-controlled voltage source 13, so that the pressure loss and the flow characteristic of the waterway device are electrically simulated, the flow is simulated by using the current, and the water pressure difference (pressure loss) is simulated by using the voltage.
As shown in fig. 6 (a), since the number of various devices is different (the number of IGBTs and freewheeling diodes is 4, and the number of rectifying diodes is 6), two parallel waterways are designed, one of which flows through the IGBT radiator, the freewheeling diode radiator, and the rectifying diode radiator (waterway 15) in order, and the other flows through the 2 rectifying diode radiators (waterway 14). Because the number of radiators, the shape of the water pipes and the number of the water pipes of the waterway 14 are different from those of the waterway 15, the flow resistance and the flow rate of the two are different, and the flow resistance of the waterway 14 needs to be increased, so that the flow rates of all parallel waterways are the same. The pressure loss and flow characteristic data of the water pipes of each branch are calculated by using the pressure loss and flow calculation tool shown in fig. 4, a modeling method shown in fig. 5 is used to build a pressure loss and flow equivalent electrical simulation model of the water pipes, the same method can obtain a pressure loss and flow equivalent electrical simulation model of the radiator, and equivalent circuit simulation models 16 and 17 of the branch 14 and the branch 15 in fig. 6 (a) are built respectively. The branch flow is simulated by adopting a current source, the design flow of each branch is rated flow, the pressure loss of the branch 14 and the branch 15 can be obtained through simulation, the simulation result is shown in fig. 6 (b), and the pressure loss of the branch 14 is higher than the pressure loss of the branch 15, so that the necking (the position shown in fig. 3) of a water pipe is required to be designed in the branch 14 to compensate the pressure loss difference value, the pressure loss of the branch 14 and the pressure loss of the branch 15 are equal under the rated flow, and the purpose of balancing the flow of each parallel branch is achieved.
Fig. 7 is a diagram of a result of scanning analysis (under rated flow) of a pressure loss and an inner diameter of a necking with a target length based on finite element simulation software, wherein the necking length is first fixed to the target length, scanning simulation is performed on necking with different inner diameters to obtain a relationship curve of the pressure loss and the inner diameter of the necking, and the inner diameter value of the necking water pipe corresponding to the target pressure loss can be obtained from the curve.
FIG. 8 is a graph of the pressure loss and flow rate of the neck obtained by applying the calculation tool designed in FIG. 4, and substituting the graph data into the equivalent model shown in FIG. 5 to obtain the equivalent simulation model of the pressure loss and flow rate of the neck.
FIG. 9 is a simulation model and simulation result of the overall waterway of the megawatt power unit of the frequency converter, wherein the figure (a) is an established overall waterway equivalent model of the power unit, the model 18 is an equivalent circuit model of a waterway branch 14, a necking equivalent model is added to the branch, other 5 waterway models are identical, the 17 is a waterway equivalent circuit model of a branch 15, and the total waterway flow is the sum of rated flows of all branches; fig. (b) shows the flow simulation results of the branch 14 and the branch 15. It can be seen that the flow of each parallel waterway branch is basically equal after necking is added, so that the purpose of balancing the waterway flow is achieved. The graph (c) shows the simulation result of the total pressure loss of the unit, and can be seen that the total pressure loss of the inlet and the outlet of the designed power unit is about 3bar under the rated flow, thereby providing a reference basis for the model selection of the water cooling system.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.
The above examples are implemented on the premise of the technical scheme of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the above examples. All other embodiments, which can be made by those skilled in the art without the inventive effort, are intended to be within the scope of the present invention.
Claims (7)
1. The method is characterized in that the method designs a waterway connection structure of the power unit, and equivalent the waterway connection structure as a circuit connection structure, performs circuit simulation by using the equivalent circuit structure, determines necking parameters of the corresponding waterway position according to simulation data, and realizes flow balancing result of the waterway;
the method comprises the following steps:
step 1: developing a preliminary device arrangement scheme and a power unit waterway connection topological structure design according to the actual electrical topology of the power unit and the heat loss calculation result of the power semiconductor device;
step 2: calculating the pressure loss and flow characteristics of the water-cooled radiator and each water pipe;
step 3: the electric characteristics of the water cooling radiator and each water pipe are equivalent according to the pressure loss and flow characteristics of the water cooling radiator and each water pipe, wherein the electric characteristics comprise current and voltage characteristics; equivalent flow characteristics to current characteristics and equivalent pressure loss characteristics to voltage characteristics;
step 4: selecting an equivalent electric model and building a circuit connection topology simulation model according to the equivalent electric characteristics of each water-cooling radiator and each water pipe and the connection topology of each parallel branch waterway;
step 5: obtaining a voltage and current simulation result according to the constructed circuit connection topological structure simulation model;
step 6: equivalently obtaining the pressure loss results of all parallel branches of the waterway design according to the obtained voltage and current simulation results;
step 7: setting necking down on waterways of other parallel branches by taking the branch with the largest pressure loss in each parallel branch as a reference, designing corresponding necking down parameters according to the pressure loss result of each parallel branch, and balancing the waterway flow of each parallel branch;
step 8: and constructing a complete waterway model of the power unit, checking flow balance of each parallel branch, and checking total pressure loss of a waterway inlet and a waterway outlet of the power unit.
2. The method for designing the waterway of the power unit of the frequency converter based on the crimping device according to claim 1, wherein the power semiconductor device in the power unit is the crimping power semiconductor device, and in the step 1, the waterway of the power unit is designed into a plurality of parallel branches, and each parallel branch is formed by connecting water-cooling radiators of the power semiconductor devices in series.
3. The method for designing the waterway of the frequency converter power unit based on the crimping device according to claim 1, wherein in the process of equivalent connection structure of the waterway as connection structure of a circuit, current source is adopted to simulate branch flow, design flow of each parallel branch is rated flow, voltage drop of each parallel branch is obtained through circuit simulation, and voltage drop of each parallel branch is equivalent to pressure loss of the branch.
4. The method for designing the waterway of the power unit of the frequency converter based on the crimping device according to claim 1, wherein in the step 7, the necking design specifically comprises: according to the built equivalent circuit simulation models of different parallel waterways, the voltage difference, namely the pressure loss, of each parallel branch is obtained through simulation, and the pressure loss difference of each parallel branch is corrected through designing corresponding necking, so that the purpose of balancing the waterway flow is achieved.
5. The waterway design method of the frequency converter power unit based on the crimping device according to claim 1, wherein in the step 7, in terms of necking parameter design, the method comprises the following steps:
1) Firstly, fixing the design length of a necking;
2) Scanning simulation is carried out on the necking with different inner diameters, and a relationship curve between necking pressure loss and inner diameter is obtained;
3) And finding out the inner diameter of the necking corresponding to the pressure loss correction value on the curve, and determining the designed size of the inner diameter of the necking.
6. The waterway structure designed by the waterway design method of the frequency converter power unit based on the crimping device is characterized in that the power semiconductor device in the power unit is the crimping type power semiconductor device, the waterway structure of the power unit comprises a plurality of parallel branches, each parallel branch is formed by connecting water cooling radiators of the power semiconductor devices in series, necking is arranged on waterways of other parallel branches by taking the branch with the largest pressure loss in each parallel branch as a reference, and the necking parameters are finally determined according to the waterway design method of the frequency converter power unit based on the crimping device.
7. The waterway structure designed by the waterway design method of the frequency converter power unit based on the crimping device is characterized in that the high-voltage frequency converter power unit is of an uncontrolled rectifying connection H-bridge inversion topological structure, the rectifying side is composed of 6 crimping rectifying diodes, the inversion side is composed of 4 crimping IGBT and 4 crimping fast recovery diodes, 3 devices are independently crimped to form a rectifying diode component, an IGBT component and a freewheel diode component, and a water cooling radiator is arranged between the upper device and the lower device which are crimped in the component and between the uppermost end and the lowermost end of the component;
the waterway of the high-voltage frequency converter power unit is designed into 6 parallel waterways, wherein the waterways comprise 5 waterways which pass through the IGBT, the 5 waterways are identical, and each waterway is sequentially connected with the IGBT water-cooling radiator, the flywheel diode water-cooling radiator and the rectifier diode water-cooling radiator to form a serial waterway; the novel energy-saving LED lamp further comprises an independent 1-path waterway, because the number of the rectifier diode water-cooling radiators is different from that of the IGBT water-cooling radiators, the independent 1-path waterway is designed to be a serial waterway formed by connecting the other 2 rectifier diode water-cooling radiators, and necking is arranged on the parallel branch of the independent 1-path waterway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310988682.0A CN117150732B (en) | 2023-08-08 | 2023-08-08 | Frequency converter power unit waterway design method and structure based on crimping device |
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| CN202310988682.0A CN117150732B (en) | 2023-08-08 | 2023-08-08 | Frequency converter power unit waterway design method and structure based on crimping device |
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