CN219697499U - Power converter - Google Patents
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- CN219697499U CN219697499U CN202321145634.7U CN202321145634U CN219697499U CN 219697499 U CN219697499 U CN 219697499U CN 202321145634 U CN202321145634 U CN 202321145634U CN 219697499 U CN219697499 U CN 219697499U
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- 238000002955 isolation Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 230000035939 shock Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 abstract description 2
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- 230000005540 biological transmission Effects 0.000 description 1
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- 230000007423 decrease Effects 0.000 description 1
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- 239000003822 epoxy resin Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011104 metalized film Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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Abstract
The utility model discloses a power converter, comprising: the box, main control board, drive plate, electric capacity, inductance, power module, IGBT, it all sets up in the box. The main control board receives signals of the upper controller and controls the driving board; the IGBT is controlled by the control signal of the driving plate; the IGBT transmits the strong voltage of the capacitor into the inductor; the inductor transmits the processing result of the strong voltage to the power module; the power supply module outputs +28V and-28V electricity through the 28V output aviation plug, so that +28V and-28V voltage output is realized.
Description
Technical Field
The present utility model relates to a power converter.
Background
The current society has increased power consumption demands in various industries, and people pay more attention to the utilization of electric energy, and the power converter has the task of providing voltage and current in a form most suitable for a user load, so that the load is not influenced by fluctuation of a power grid while being in rated power operation. However, some power converters in the market at present have complicated structures, large power loss and poor heat dissipation effect, and especially for converters with high power input and low power output requirements, the structure and the device are difficult to save, and the voltage is extremely reduced.
Disclosure of Invention
Therefore, in order to overcome the defects, the utility model provides the power converter which has the advantages of compact structure, light weight, high space utilization rate, high power density, high and stable cooperative control synchronism, and solves the defects of more transmission harnesses, large volume, low space utilization rate, low power density and the like between a main control board and a driving board and between modules in the prior art.
The technical scheme of the utility model is as follows: the power converter comprises a box body, wherein the box body consists of a lower box and an upper cover, and a 28V positive output aviation plug, a 28V negative output aviation plug, a high-voltage input aviation plug and a low-voltage communication aviation plug which are communicated with each other inside and outside are arranged on the wall of the box body;
the inside of the box body is mainly provided with a main control board, a driving board, an IGBT, an input filter capacitor, an output filter capacitor, a diode, an inductor, a power module and a voltage acquisition board;
the main control board is positioned at the middle upper position in the box body, the voltage acquisition board is positioned above the main control board, the driving board is positioned below the main control board, the IGBT is positioned below the driving board, the power supply modules are positioned below the IGBT and are isolated from each other by the shielding isolation board; the input filter capacitor, the output filter capacitor, the diode and the inductor are positioned at two sides of the main control board and the driving board;
the main control board is provided with a main control circuit, the driving board is provided with a driving circuit, the main control circuit is communicated with the upper-layer controller through a low-voltage communication aviation plug, signals of the upper-layer controller are received, the output end of the main control circuit is connected with the driving circuit, and control signals are output; the input end of the driving circuit is connected with the main control circuit, receives the control signal, and the output end of the driving circuit is connected with the IGBT and outputs the switching signal;
the power conversion circuit is composed of an IGBT, an input filter capacitor, an output filter capacitor, a diode, an inductor and a power module, wherein the input filter capacitor is connected to the power input end of the generator through a high-voltage input aviation plug, the IGBT is connected to the power input circuit after the input filter capacitor in series, the inductor is connected to the IGBT in series, the diode is connected to the front end of the inductor in parallel and is grounded, the output filter capacitor and the power module are connected to the rear end of the inductor in parallel, and the power module is connected to external electric equipment through a 28V positive output aviation plug and a 28V negative output aviation plug.
Further: the upper cover is fixedly connected with the lower box through a bolt, a sealing groove is formed in the contact surface of the upper cover and the lower box, and a sealing rubber strip is embedded in the sealing groove; the four corners of the outer part of the lower box are provided with supporting legs, and the bottoms of the supporting legs are provided with shock pads.
Further: the box body is internally provided with a heat dissipation air duct which is arranged below the power module, and the bottom surface of the box body is provided with a heat dissipation fan.
Further: and the main control board is also provided with a CAN communication circuit, a protection circuit, an acquisition circuit and a detection circuit.
Further: the voltage acquisition board acquires input and output voltage and feeds back the input and output voltage to the main control board, and the main control board is transmitted to the upper controller through the low-voltage communication aviation plug.
Further: and a current sensor is arranged between the IGBT and the inductor.
Further: two groups of power conversion circuits consisting of an input filter capacitor, an IGBT, an output filter capacitor, a diode, an inductor and a power supply module are arranged in parallel.
Further: the power supply modules are divided into three groups, and each group is 3.5KW.
The power converter has only one main control board, the control chip on the main control board receives the signals of the upper controller and outputs the control signals after processing, the control signals are used for controlling the IGBT, the converter is internally provided with the buck circuit composed of the capacitor, the IGBT, the inductor and the power supply module, and the plurality of circuits can be controlled by one main control board, so that the structure is simpler, the connecting wire harness is fewer, and the defect of electromagnetic interference of the converter is effectively reduced.
Drawings
FIG. 1 is an elevation view of the appearance of the present utility model;
FIG. 2 is a reverse view of the present utility model;
FIG. 3 is an exploded view of the structure of the present utility model;
FIG. 4 is a control schematic;
fig. 5 is a parallel power conversion circuit diagram.
In the figure: 1: a case; 1-1: lower box; 1-2: an upper cover; 1-3: a heat radiation fan; 1-4: a support leg;
2:28V positive pole outputs aviation plug; 3:28V negative electrode output aviation plug; 4: high-voltage input aviation plug; 5: low voltage communication aviation plug; 6: a main control board; 7: a driving plate; 8: an IGBT;9: inputting a filter capacitor; 10: an output filter capacitor; 11: a diode; 12: an inductance; 13: a power module; 14: a voltage acquisition board; 15: a support frame; 16: and shielding the isolation plate.
Detailed Description
For the convenience of implementation, the present utility model will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the present embodiment provides a 900V input 28V output power converter, which includes a case 1, wherein various components are installed in the case 1, so that the case 1 includes a lower case 1-1 having a constant volume cavity and an opening at the top, and an upper cover 1-2 disposed at the opening at the top of the lower case 1-1, and the internal components are assembled and disassembled after the upper cover is uncovered, and a closed whole is formed after the upper cover is covered; the upper cover 1-2 is fixedly connected with the lower box 1-1 through a fixing bolt, so that the upper cover is convenient to install and detach, and furthermore, a sealing groove is formed in one or two sides of the contact surface of the upper cover 1-2 and the lower box 1-1, and sealing rubber strips are embedded in the sealing groove so as to enhance the sealing performance of the box body.
Further, a cooling fan 1-3 is installed on the bottom surface of the box body, and faces to the cooling air duct in the box body for cooling.
Further, the supporting legs 1-4 are arranged at four corners of the bottom of the box body, the supporting legs 1-4 play a role in supporting the box body away from the ground so that the fan can fully dissipate heat, and the bottom of the supporting legs 1-4 is provided with the shock pad so as to play a role in effectively absorbing shock.
Be provided with various aviation plugs on the box 1 for interior external circuit and signal intercommunication, including: the 28V positive pole output aviation plug 2, the 28V negative pole output aviation plug 3, the high voltage input aviation plug 4 and the low voltage communication aviation plug 5, thereby realizing 900V high voltage input and 28V low voltage output.
The 28V positive electrode outputs an aviation plug 2, one end of the aviation plug is connected with the positive electrode of a power supply module in the converter, and the other end of the aviation plug is connected with the positive electrode of the vehicle-mounted battery; the 28V negative electrode outputs an aviation plug 3, one end of the aviation plug is connected with the negative electrode of the power module in the converter, and the other end of the aviation plug is connected with the negative electrode of the vehicle-mounted battery; the 28V positive and negative pole output aviation plug is responsible for low-voltage output.
And one end of the high-voltage input aviation plug 4 is connected with the voltage output end of the generator, and the other end of the high-voltage input aviation plug is connected to an input filter capacitor in the converter and is used for inputting a 900V high-voltage power supply.
And one end of the low-voltage communication aviation plug 5 is connected with the whole vehicle upper-layer controller, the other end of the low-voltage communication aviation plug is connected with the main control board inside the converter, has voltage access of more than ten volts, and is simultaneously communicated with the upper-layer controller, so that the low-voltage communication aviation plug is used for supplying power to the power converter at low voltage and sending control signals to the main control board.
Various components are arranged in the box body, and the power conversion control principle is shown in fig. 4, wherein the components comprise a main control board 6, a driving board 7, an IGBT 8, an input filter capacitor 9, an output filter capacitor 10, a diode 11, an inductor 12, a power module 13, a voltage acquisition board 14 and the like, and the structure of the power conversion control principle is shown in fig. 3.
Structurally, a plurality of supporting frames 15 and shielding isolation plates 16 are arranged in the box body and used for installing various boards and components and isolating the boards and the components, so that the whole structure is firmly restrained.
The main control board 6 is arranged at the middle upper position in the box body, the driving board 7 is arranged below the main control board 6, and the main control board 6 and the driving board 7 are shielded and isolated by the shielding and isolating board 16, so that strong and weak electricity is effectively isolated; the IGBT 8 is arranged below the driving plate 7, and is also isolated by a shielding isolation plate, the connecting lines among the main control plate 6, the driving plate 7 and the IGBT 8 can be all placed in sequence, the three are isolated by the shielding isolation plate and are not mutually interfered, the space utilization rate is good, and the connecting lines of the main control plate 6 and the driving plate 7 and the connecting lines of the driving plate 7 and the IGBT 8 are all twisted-pair lines.
The two sides of the main control board 6 and the driving board 7 are respectively provided with an input filter capacitor 9, an output filter capacitor 10, a diode 11, an inductor 12 and other devices, and the devices are supported by a supporting frame. The power module 13 is arranged below the main control board 6, the driving board 7 and the IGBT 8 and is isolated by a shielding isolation board. The voltage acquisition board 14 is arranged above the main control board 6, and is isolated from the main control board 6 by a shielding isolation board.
In terms of circuit construction, the main control board 6 and the driving board 7 mainly drive and control the power conversion circuit. The main control board 6 is provided with a main control circuit for controlling the driving board 7, and the driving board 7 is provided with a driving circuit for driving the power conversion circuit; the main control circuit and the driving circuit belong to conventional design circuits, and mainly send out control signals and driving signals, which are not described herein. The input end of the main control circuit is connected with the CAN bus of the whole vehicle and is used for receiving signals of the upper-layer controller, processing the signals of the upper-layer controller and outputting corresponding control signals, wherein the control signals are mainly duty ratio signals of PWM waves, and the output end of the main control circuit is connected with the driving circuit; the input end of the driving circuit is connected with the main control circuit, receives the control signal, and becomes a driving signal which can be received by the power conversion circuit after being processed, and mainly is a switching signal designed according to the duty ratio, and the output end of the driving circuit is connected with the IGBT 8 of the power conversion circuit and is used for controlling the on-off of the IGBT 8.
The power conversion circuit is a buck-type circuit, and high-voltage power (900V) output by the generator enters the circuit after being filtered by the input filter capacitor 9; the IGBT 8 is connected in series with a power input end after being filtered by the input filter capacitor 9, and the power input is controlled by on-off of the IGBT; after the inductor 12 is connected in series with the IGBT 8, the diode 11 is connected in parallel with the front end of the inductor 12 and grounded, and the output filter capacitor 10 and the power module 13 are connected in parallel with the rear end of the inductor 12. The power module 13 aims to output stable 28V low-voltage direct current outwards, so that stable voltage can be output by controlling the on-off time (duty ratio) of the IGBT 8, the current of the inductor 12 and the capacity of the output filter capacitor 10, one end of the inductor 12 is connected with the IGBT 8, the other end of the inductor is connected with the power module 13, when the IGBT is conducted, the current in the inductor slowly increases to store energy, when the IGBT is disconnected, the current in the inductor slowly decreases to release energy, and the PWM wave of the main control board is transmitted to the driving board to adjust the closing and opening time of the IGBT, so that the output effect of the control energy is achieved.
The voltage acquisition board 14 is used for acquiring voltages of an input end and an output end of a circuit, the acquired voltages are fed back to the main control board 6, the main control board 6 is transmitted to the low-voltage communication aviation plug 5 through an electric signal, the upper controller of the whole automobile can know input and output voltages through communication, and the duty ratio signal of the main control board is adjusted through knowing the condition of the output voltage.
Further, the main control board 6 is provided with a CAN communication circuit, a protection circuit, an acquisition circuit and a detection circuit in addition to the main control circuit; the CAN communication circuit is used for communicating with an upper controller, the protection circuit is used for overcurrent and overvoltage protection of the power conversion circuit, the acquisition circuit is used for acquiring input and output voltages, and the detection circuit comprises: the system comprises a position signal processing circuit, a current signal processing circuit, a bus voltage detection circuit, a temperature signal processing circuit, a debugging interface circuit and other circuits, wherein each detection processing circuit is electrically connected with a main control circuit, receives external signals through respective interfaces, processes the signals and transmits the processed signals to a control chip for the control chip to make decisions.
Further, a current sensor is connected between the IGBT 8 and the inductor 12 for measuring the current through the inductor 12 to adjust the duty cycle.
Further, two buck circuits can be arranged at the output end of the generator in parallel to realize uninterrupted voltage reduction output, and as shown in fig. 5, continuous output can be realized by adjusting the on-off time of the IGBTs in the two buck circuits alternately.
Furthermore, the input filter capacitor and the output filter capacitor are selected as absorption capacitors in the device, the absorption capacitors are provided with double-sided metallized films and an internal series structure, and the external package is made of flame-retardant plastic shells and epoxy resin, so that the capacitors have low inductance, and the design of a plurality of leads can bear higher ripple circuits, high du/dv and high overvoltage capacity.
Furthermore, the power module 13 needs a relatively large step-down power, so the power module may be formed by connecting three groups of 3.5KW power supplies in parallel. The converter has compact internal structure and multiple devices, a heat dissipation air duct is arranged at the bottom of the box body, and the heat dissipation air duct is arranged below the power supply module and leads to the heat dissipation fans 1-3.
Claims (8)
1. The utility model provides a power converter, includes a box, the box comprises lower case and upper cover, its characterized in that:
the box wall of the box body is provided with a 28V positive output aviation plug, a 28V negative output aviation plug, a high-voltage input aviation plug and a low-voltage communication aviation plug which are communicated with each other inside and outside;
the inside of the box body is mainly provided with a main control board, a driving board, an IGBT, an input filter capacitor, an output filter capacitor, a diode, an inductor, a power module and a voltage acquisition board;
the main control board is positioned at the middle upper position in the box body, the voltage acquisition board is positioned above the main control board, the driving board is positioned below the main control board, the IGBT is positioned below the driving board, the power supply modules are positioned below the IGBT and are isolated from each other by the shielding isolation board; the input filter capacitor, the output filter capacitor, the diode and the inductor are positioned at two sides of the main control board and the driving board;
the main control board is provided with a main control circuit, the driving board is provided with a driving circuit, the main control circuit is communicated with the upper-layer controller through a low-voltage communication aviation plug, signals of the upper-layer controller are received, the output end of the main control circuit is connected with the driving circuit, and control signals are output; the input end of the driving circuit is connected with the main control circuit, receives the control signal, and the output end of the driving circuit is connected with the IGBT and outputs the switching signal;
the power conversion circuit is composed of an IGBT, an input filter capacitor, an output filter capacitor, a diode, an inductor and a power module, wherein the input filter capacitor is connected to the power input end of the generator through a high-voltage input aviation plug, the IGBT is connected to the power input circuit after the input filter capacitor in series, the inductor is connected to the IGBT in series, the diode is connected to the front end of the inductor in parallel and is grounded, the output filter capacitor and the power module are connected to the rear end of the inductor in parallel, and the power module is connected to external electric equipment through a 28V positive output aviation plug and a 28V negative output aviation plug.
2. The power converter of claim 1, wherein: the upper cover is fixedly connected with the lower box through a bolt, a sealing groove is formed in the contact surface of the upper cover and the lower box, and a sealing rubber strip is embedded in the sealing groove; the four corners of the outer part of the lower box are provided with supporting legs, and the bottoms of the supporting legs are provided with shock pads.
3. The power converter of claim 1, wherein: the box body is internally provided with a heat dissipation air duct which is arranged below the power module, and the bottom surface of the box body is provided with a heat dissipation fan.
4. The power converter of claim 1, wherein: and the main control board is also provided with a CAN communication circuit, a protection circuit, an acquisition circuit and a detection circuit.
5. The power converter of claim 1, wherein: the voltage acquisition board acquires input and output voltage and feeds back the input and output voltage to the main control board, and the main control board is transmitted to the upper controller through the low-voltage communication aviation plug.
6. The power converter of claim 1, wherein: and a current sensor is arranged between the IGBT and the inductor.
7. The power converter of claim 1, wherein: two groups of power conversion circuits consisting of an input filter capacitor, an IGBT, an output filter capacitor, a diode, an inductor and a power supply module are arranged in parallel.
8. The power converter of claim 1, wherein: the power supply modules are divided into three groups, and each group is 3.5KW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321145634.7U CN219697499U (en) | 2023-05-12 | 2023-05-12 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321145634.7U CN219697499U (en) | 2023-05-12 | 2023-05-12 | Power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219697499U true CN219697499U (en) | 2023-09-15 |
Family
ID=87969093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321145634.7U Active CN219697499U (en) | 2023-05-12 | 2023-05-12 | Power converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219697499U (en) |
-
2023
- 2023-05-12 CN CN202321145634.7U patent/CN219697499U/en active Active
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