CN115696857A - Frequency converter - Google Patents

Abstract

The invention discloses a frequency converter, which comprises a shell, an upper PCB (printed circuit board), a lower PCB, a connecting terminal, a common ground connecting wire and a radiator, wherein the shell comprises an upper base and a lower base; the fan is arranged at the top of the lower base, the air inlet slots are formed in the tail of the lower base, and the air inlet slots are arranged at the tail of the lower base in an array mode. The frequency converter has the advantages of simple structure, good heat dissipation effect, sufficient and reasonable installation space and easy assembly; the lower base is provided with the air inlet slot, so that the air inlet efficiency and the heat exchange frequency can be accelerated, and the heat dissipation of the power device is accelerated.

Description

Frequency converter

Technical Field

The invention relates to the technical field of frequency converters, in particular to a frequency converter.

Background

Patent No. CN114286598A discloses a cooling device of high-power converter, the converter heat radiation structure who designs comprises cooling water circulation pipeline, adopt liquid cooling scheme to solve heat dissipation problems such as bus-bar capacitance and main power device, compare in traditional converter structure, the heat radiation structure of this patent, though can improve the heat dissipation volume of converter effectively, but the cooling water circulation pipeline who adds, it is big to occupy installation space, also greatly increased the assembly with dismantle degree of difficulty and manufacturing cost.

Patent No. CN114096128A discloses a heat dissipation device for a frequency converter, the heat dissipation device has dispelled the heat by air-cooled and water-cooled mode, though this frequency converter has promoted the radiating quality through this heat dissipation device, but the radiating liquid that uses need be changed into copper material with the cavity inner wall of placing the radiating liquid for guaranteeing that it can not volatilize and influence the circuit board, is difficult to satisfy the needs of low-cost use.

With the rapid development of high-power electronic devices, frequency converters are widely applied in various electrical industries. The requirements of various industries on the volume structure of the frequency converter are more and more compact, the requirements on the heat dissipation design and the whole machine cost of the system are also continuously improved, in order to improve the reliability of products, the structural layout design is carried out through thermal design optimization calculation while the cost is reduced, and the realization of efficient heat dissipation of equipment is a very important link.

At present, the heat productivity of main power devices such as a bus capacitor, a rectifier bridge radiator, an IPM/PIM module and a radiator of a high-power frequency converter in the market is mainly solved by adopting a heat dissipation structure layout, but the structural design and the PCB layout design cannot be considered due to unreasonable device layout, and the optimal design solution is difficult to realize at the same time. Therefore, a frequency converter which is reasonable in layout, good in heat dissipation effect and easy to assemble is urgently needed to be designed.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a frequency converter, which can meet the requirements of reasonability and compactness of frequency converter devices, can ensure heat dissipation performance, and has compact structure of the whole machine, good heat dissipation effect and good assembly performance.

The technical scheme adopted by the invention for solving the technical problems is as follows: a frequency converter comprises a shell, an upper PCB, a lower PCB, a connecting terminal, a common ground connecting wire and a radiator, wherein the shell comprises an upper base and a lower base; the fan is arranged at the top of the lower base, the air inlet slots are formed in the tail of the lower base, and the air inlet slots are arranged at the tail of the lower base in an array mode.

As a further improvement of the invention: the upper base is provided with a transverse buckle, a longitudinal buckle and a screw, and is fixedly connected with the upper PCB through the transverse buckle, the longitudinal buckle and the screw.

As a further improvement of the invention: go up the base and be equipped with two horizontal buckles, a vertical buckle and an M3 screw, go up the base and pass through two horizontal buckles, a vertical buckle and an M3 screw and upper PCB board fixed connection.

As a further improvement of the invention: the upper PCB board is provided with a control circuit, and the lower PCB board is provided with a drive circuit.

As a further improvement of the invention: the upper PCB board is provided with a master control IC and a display IC, and the lower PCB board is provided with a rectification inverter module, an IPM/PIM module, a bus capacitor, a switching power supply circuit and a current sampling circuit.

As a further improvement of the invention: the rectification inversion module is fixed on the radiator, and heat dissipation silicone grease is filled between the rectification inversion module and the radiator.

As a further improvement of the invention: the height of the fins of the radiator is equal to that of the bus capacitor, and the heights of the fins of the radiator and the bus capacitor are both 60mm.

As a further improvement of the invention: the IPM/PIM module is arranged above the radiator.

As a further improvement of the invention: the IPM/PIM module is electrically connected with the fan.

As a further improvement of the invention: the air intake fluting is the rectangular hole, and the grooved size of air intake is 10mm × 3mm.

As a further improvement of the invention: the common ground of the upper PCB and the lower PCB is connected through a lead wire, and the common ground of the lower PCB is connected with the weak current ground through a lead wire.

As a further improvement of the invention: the thickness of the fins of the radiator is 1mm, and the gaps among different fins of the radiator are 3-5mm.

As a further improvement of the invention: the direction of the fins of the radiator is consistent with the direction of the air inlet.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention has simple structure, good heat dissipation effect, sufficient and reasonable installation space and easy assembly; the lower base is provided with the air inlet slot, so that the air inlet efficiency and the heat exchange frequency can be accelerated, and the heat dissipation of the power device is accelerated.

2. According to the invention, the upper PCB is fixed through the two transverse buckles and the longitudinal buckle, and after the upper PCB is fixed on the buckles, the upper PCB can be fixed by locking one screw, so that the assembly and disassembly are convenient.

3. The invention has the advantages that the heat radiator is arranged, the heat radiating silicon is coated to accelerate the heat radiation of the module, and the module can feed back through the circuit temperature signal to further control the running speed of the fan, thereby improving the heat radiation effect.

4. According to the invention, through the layout design and the heat dissipation structure design of the frequency converter, the frequency converter is reasonable in layout, the interference of strong and weak electric signals of the controller is effectively reduced, the stability of the controller is improved, the whole structure is simple and easy to install, the whole structure has a good heat dissipation effect, and the reliability of the product is effectively improved.

5. According to the invention, the right upper layer PCB and the lower layer PCB are arranged, the control circuit is arranged on the upper layer PCB, and the power supply and the driving circuit are arranged on the lower layer PCB, so that strong and weak current interference is effectively prevented. Through being connected upper PCB board and lower floor's PCB board through connecting terminal, and handle through being in the same place the connecting wire, improve the interference, effectively improve the interference killing feature, effectively improve the controller performance, and simplify the assembly, promote assembly efficiency.

Drawings

Fig. 1 is a schematic view of the internal structure of the present invention.

Fig. 2 is a schematic view of a combined structure of an upper PCB and a lower PCB.

Fig. 3 is a schematic structural diagram of an upper PCB board.

Fig. 4 is a schematic structural view of a lower PCB board.

Fig. 5 is a schematic structural view of the upper base.

Fig. 6 is a schematic structural view of the lower base.

Reference numerals are as follows: 1. an upper PCB board; 2. a lower PCB board; 3. a connection terminal; 4. a common ground connection line; 5. a heat sink; 6. an upper base; 7. a lower base; 8. transversely buckling; 9. longitudinally buckling; 10. a screw; 11. the air inlet is grooved; 12. an IPM/PIM module; 13. a fan; 14. a base plate; 15. a cover; 16. and (4) screws.

Detailed Description

In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The invention will now be further described with reference to the following description and examples in conjunction with the accompanying drawings:

the first embodiment is as follows:

a frequency converter comprises a shell, an upper PCB (printed circuit board) 1, a lower PCB 2, a connecting terminal 3, a common ground connecting wire 4 and a radiator 5, wherein the shell comprises an upper base 6 and a lower base 7, the upper PCB is arranged on the upper base, the lower PCB and the radiator are arranged on the lower base, the upper base is connected with the lower base, the upper PCB and the lower PCB are connected through the connecting terminal, and the upper PCB and the lower PCB are connected in a ground mode through the common ground connecting wire; the top of lower base is equipped with fan 13, the afterbody of lower base is equipped with air intake fluting 11, air intake fluting arranges in lower base afterbody with the array mode. The invention has simple structure, good heat dissipation effect, sufficient and reasonable installation space and easy assembly; the lower base is provided with the air inlet slot, so that the air inlet efficiency and the cold-heat exchange frequency can be accelerated, and the heat dissipation of a power device is accelerated.

The second embodiment is as follows:

the utility model provides a frequency converter, includes casing, upper PCB board 1, lower floor's PCB board 2, connecting terminal 3, common ground connecting wire 4 and radiator 5, the casing includes base 6 and lower base 7, upper PCB board is installed in last base, lower floor's PCB board and radiator are installed in lower base, it is connected with lower base to go up the base, upper PCB board and lower floor's PCB board pass through connecting terminal and connect, upper PCB board and lower floor's PCB board are connected through common ground connecting wire ground connection, the top of base is equipped with fan 13 down, the afterbody of base is equipped with air intake fluting 11 down, the air intake fluting is arranged the base afterbody under with the array mode. Go up base 6 and be equipped with horizontal buckle 8, vertical buckle 9 and screw 10, go up the base through horizontal buckle, vertical buckle and screw and upper PCB board fixed connection. Go up the base and be equipped with two horizontal buckles, a vertical buckle and an M3 screw, go up the base and fix the processing through two horizontal buckles and a vertical buckle to upper PCB board, fix upper PCB board behind the buckle, lock an M3 screw and can accomplish the fixed of upper PCB board. Go up the base and install fixedly upper PCB board, go up the base and fix the processing through two horizontal buckles and a vertical buckle to upper PCB board, fix upper PCB board behind the buckle, lock an M3 screw and can accomplish the fixed to upper PCB board for the whole assembly is laborsaving in trouble-saving.

The third embodiment is as follows:

the utility model provides a frequency converter, includes casing, upper PCB board 1, lower floor's PCB board 2, connecting terminal 3, common ground connecting wire 4 and radiator 5, the casing includes base 6 and lower base 7, upper PCB board is installed in last base, lower floor's PCB board and radiator are installed in lower base, it is connected with lower base to go up the base, upper PCB board and lower floor's PCB board pass through connecting terminal and connect, upper PCB board and lower floor's PCB board are connected through common ground connecting wire ground connection, the top of base is equipped with fan 13 down, the afterbody of base is equipped with air intake fluting 11 down, the air intake fluting is arranged the base afterbody under with the array mode. Go up base 6 and be equipped with horizontal buckle 8, vertical buckle 9 and screw 10, go up base through horizontal buckle, vertical buckle and screw and upper PCB board fixed connection. Go up the base and be equipped with two horizontal buckles, a vertical buckle and an M3 screw, go up the base and fix the processing through two horizontal buckles and a vertical buckle to upper PCB board, fix upper PCB board behind the buckle, lock an M3 screw and can accomplish the fixed of upper PCB board. Go up the base and install fixedly upper PCB board, go up the base and fix the processing through two horizontal buckles and a vertical buckle to upper PCB board, fix upper PCB board behind the buckle, lock an M3 screw and can accomplish the fixed to upper PCB board for the whole assembly is laborsaving in trouble-saving.

The upper PCB board is provided with a control circuit, and the lower PCB board is provided with a drive circuit. The upper PCB board is provided with a master control IC, a display IC and other signal processing circuits. The lower PCB board is provided with a rectification inverter module, an IPM/PIM module 12, a bus capacitor, a switching power supply circuit and a current sampling circuit. The control circuit is used as an upper PCB, the drive circuit is used as a lower PCB, and the upper PCB and the lower PCB are respectively arranged at the upper end and the lower end of the shell, so that the problem that strong current and weak current interfere with each other to influence the performance of devices is solved. The upper PCB and the lower PCB are connected through the connecting terminals, the upper PCB and the lower PCB are in ground connection through the common ground connecting wire, and the control circuit device of the weak current part is arranged on the upper PCB and is effectively isolated from the power circuit and the driving circuit in space, so that the problems that strong and weak current signals interfere with each other and the performance of the device is influenced are effectively prevented; and the connecting terminal and the common ground connecting wire are flexible structures, so that the combination and installation of the upper PCB and the lower PCB or the upper base and the lower base are facilitated, and the space can be saved.

The rectification inversion module is fixed on the radiator through screws, and heat dissipation silicone grease is filled between the rectification inversion module and the radiator and used for enhancing heat dissipation.

The fourth embodiment is as follows:

the utility model provides a frequency converter, includes casing, upper PCB board 1, lower floor's PCB board 2, connecting terminal 3, common ground connecting wire 4 and radiator 5, the casing includes upper base 6 and lower base 7, upper PCB board is installed in upper base, lower floor's PCB board and radiator are installed in lower base, upper base and lower base are connected, upper PCB board and lower floor's PCB board pass through connecting terminal and connect, upper PCB board and lower floor's PCB board are connected through common ground connecting wire ground connection, upper base 6 is equipped with horizontal buckle 8, vertical buckle 9 and screw 10, the upper base is through horizontal buckle, vertical buckle and screw and upper PCB board fixed connection. Go up the base and be equipped with two horizontal buckles, a vertical buckle and an M3 screw, go up the base and fix the processing through two horizontal buckles and a vertical buckle to upper PCB board, fix upper PCB board behind the buckle, lock an M3 screw and can accomplish the fixed of upper PCB board. Go up the base and install fixedly upper PCB board, go up the base and fix the processing through two horizontal buckles and a vertical buckle upper PCB board, fix upper PCB board behind the buckle, lock an M3 screw and can accomplish the fixed to upper PCB board for whole assembly is saved trouble laborsaving. The upper PCB board is provided with a control circuit, and the lower PCB board is provided with a drive circuit. The upper PCB board is provided with a master control IC, a display IC and other signal processing circuits. The lower PCB board is provided with a rectification inverter module, an IPM/PIM module 12, a bus capacitor, a switching power supply circuit and a current sampling circuit. The control circuit is used as an upper PCB, the driving circuit is used as a lower PCB, and the upper PCB and the lower PCB are respectively arranged at the upper end and the lower end of the shell, so that the problem that strong current and weak current interfere with each other to influence the performance of devices is solved. The upper PCB and the lower PCB are connected in a circuit network mode through connecting terminals, the upper PCB and the lower PCB are connected in a grounding mode through common-ground connecting wires, and control circuit devices of weak current parts are arranged on the upper PCB and are effectively isolated from a power circuit and a driving circuit in space, so that the problems that strong and weak current signals interfere with each other and the performance of the devices is influenced are effectively prevented; and the connecting terminal and the common ground connecting wire are flexible structures, so that the combination and installation of the upper PCB and the lower PCB or the upper base and the lower base are facilitated, and the space can be saved.

The common ground of the upper PCB and the lower PCB is connected through a lead wire, and the common ground of the lower PCB is connected with the weak current ground through a lead wire. The common ground of upper PCB board and lower floor's PCB board passes through pin connection, is connected the public ground network of low current ground through lead wire and lower floor's PCB board, saves space, avoids upper PCB board and lower floor's PCB board ground connection respectively to need a plurality of external ground connection terminals, has solved the problem of the electromagnetic interference that upper PCB board and lower floor's PCB board were connected together and have handled improper bringing, reduces the mutual crosstalk of signal of self, improves stability.

The rectification inversion module is fixed on the radiator through screws. And heat dissipation silicone grease is filled between the rectification inverter module and the radiator. The height of the fins of the radiator is equal to that of the bus capacitor, the height of the fins of the radiator is 60mm, and the height of the bus capacitor is 60mm. The thickness of the fins of the radiator is 1mm, and the gaps among different fins of the radiator are 4mm. The direction of the fins of the radiator is consistent with the direction of the air inlet. The rectification inversion module is fixed on the radiator through screws, and heat dissipation silicone grease is filled between the rectification inversion module and the radiator and used for enhancing heat dissipation; the height of the fins of the radiator is consistent with the height of the bus capacitor and is 60mm, the thickness of the fins is 1mm, and the gaps between the fins are preferably 3-5 mm; the direction of the fins is consistent with the mode of the air inlet, so that the circulation of air flow is facilitated, and heat is guided out in time; when guaranteeing whole heat dissipation to rationally utilize the casing space, make the structure more compact and the reliability more guaranteed, compare with traditional converter structure, on the premise of not increasing the complete machine size, solved the not enough and heat dissipation problem of space size of main power device.

Through the layout of a power circuit and a driving circuit of a lower layer PCB board, a cavity is arranged on a lower base for a bus capacitor and a power device IPM/PIM module to be placed, the bus capacitor is distributed in a linear array, fins of a radiator are parallel to the bottom surface of the bus capacitor, and the space of a radiating channel is utilized to the maximum extent; the distance between the two bus capacitors and the distance between the capacitors and the shell are kept uniform, fins of the radiator are uniformly distributed, the size of the fast radiating structure is improved to the maximum extent, the radiating capacity is improved, the air quantity generated by the fan can be uniformly distributed among the bus capacitors, the radiator and the power device, and optimal radiating is achieved.

The lower PCB board rationally utilizes the space structure through the overall arrangement to bus capacitor and power device, has solved the problem that the assembly is loaded down with trivial details, installation difficulty and structure are complicated that upper PCB board and lower floor PCB board are connected and are brought.

The IPM/PIM module is arranged above the radiator. The IPM/PIM module is arranged above the radiator to accelerate the radiating efficiency. The top of the lower base is provided with a fan 13, the tail of the lower base is provided with air inlet slots 11, and the air inlet slots are distributed at the tail of the lower base in an array mode. The air intake fluting is the rectangular hole, and the grooved size of air intake is 10mm × 3mm. The IPM/PIM module is electrically connected with the fan.

The top radiating fan is used for sucking air, negative pressure is formed inside the lower base, air flow is guided to suck air with low temperature from the tail of the lower base, and the air gradually passes through the bus capacitor, the radiator and the radiating fan to form circulation of cold air and hot air.

The air inlet slot is formed in the three directions of the tail of the lower base, the air inlet slot is formed in the three directions of the lower base, air flow is accelerated, cold and hot air exchange efficiency is improved, and a heating device is assisted to dissipate heat.

When the frequency converter works, the lower base is provided with air inlets from three directions, under the action of forced suction of cold air by the fan, the cold air directly sweeps over the surface of the bus capacitor at a certain speed to dissipate heat of the bus capacitor, then the main power device IPM/PIM module and the radiator are cooled, the cold air after heat dissipation of the power device is continuously discharged rightwards, the heat of the power device is taken out of the shell through the fan, and the received temperature feedback signal of the IPM/PIM module is used for controlling the running speed of the fan, the heat dissipation effect is improved, the problem of poor heat dissipation effect of the frequency converter is solved, and the intelligent control of the fan is realized.

Through improving the heat dissipation condition, reduce the temperature of inside bus capacitor and power device, do benefit to the life who prolongs the converter, improve the control performance of converter.

Through the overall arrangement design and the heat radiation structure design to the converter for this converter is rationally distributed, effectively reduces the strong and weak electric signal interference of controller, promotes controller stability, and complete machine simple structure easily installs, makes whole good radiating effect that has again, effectively improves product reliability.

An upper layer PCB and a lower layer PCB are designed, a control circuit is positioned on the upper layer PCB, and a power supply and a driving circuit are arranged on the lower layer PCB, so that strong and weak current interference is effectively prevented; the main control board, the power supply and the driving board are designed in a layered mode, and serialization expansion is facilitated. The main control board can be matched with driving boards of different power types or different power sections; for example, the power supply mode includes different types of single-phase AC220V, AC110V three-phase power AC380V, AC220V and the like; the driving board needs to use various devices such as 1200V/10A IPM,600V/15A IPM and the like according to the frequency converters with different power sections, and the layered arrangement improves the universality and maintainability of products and reduces the complexity of product design due to simplified design;

designing a grounding structure, and carrying out corresponding network connection on the upper layer PCB and the lower layer PCB through pin headers; the upper PCB and the lower PCB are connected through the screws and the connecting wires and are processed together, interference is improved, the anti-interference capability is effectively improved, the performance of the controller is effectively improved, assembly is simplified, and assembly efficiency is improved.

The weak current ground wire of the control loop is connected with the power supply and the strong current ground of the driving loop through leads to provide a complete backflow path for the control signal of the frequency converter, so that the area of the ground wire loop and the loop is reduced, the impedance is reduced, and the filtering effect is good; and signal interference is reduced, and the anti-interference performance of the frequency converter is improved.

The upper PCB board is fixed through two horizontal buckles and a vertical buckle and is handled, fixes the upper PCB board behind the buckle, locks a screw and can accomplish the fixed to the upper PCB board, makes things convenient for assembly and dismantlement.

The efficiency of the fan is exerted to the maximum extent through the structural layout of the frequency converter device. The radiator is additionally arranged, the module is coated with heat-radiating silicon to accelerate the heat radiation of the module, and the module can further control the running speed of the fan through the feedback of a circuit temperature signal, so that the heat radiation effect is improved.

The invention has simple heat dissipation structure, good heat dissipation effect, sufficient and reasonable installation space and easy assembly, and the air inlet is uniformly arranged in three directions of the lower base by arranging the air inlet open slot, thereby quickening the air inlet efficiency and the cold-heat exchange frequency and quickening the heat dissipation of the power device.

In the description of the present invention, it should be understood that the terms "upper end surface", "lower end surface", "top", "bottom", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and thus, cannot be construed as limiting the practical use direction of the present invention.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.

Claims (10)

1. A frequency converter, characterized by: the PCB heat dissipation device comprises a shell, an upper layer PCB, a lower layer PCB, a connecting terminal, a common ground connecting wire and a radiator, wherein the shell comprises an upper base and a lower base; the top of the lower base is provided with a fan, the tail of the lower base is provided with air inlet slots, and the air inlet slots are distributed at the tail of the lower base in an array mode.

2. A frequency converter according to claim 1, characterized in that: the upper base is provided with a transverse buckle, a longitudinal buckle and a screw, and is fixedly connected with the upper PCB through the transverse buckle, the longitudinal buckle and the screw.

3. A frequency converter according to claim 2, characterized in that: go up the base and be equipped with two horizontal buckles, a vertical buckle and an M3 screw, go up the base through two horizontal buckles, a vertical buckle and an M3 screw and upper PCB board fixed connection.

4. A frequency converter according to claim 1, characterized in that: the upper PCB board is provided with a control circuit, and the lower PCB board is provided with a drive circuit.

5. A frequency converter according to claim 4, characterized in that: the upper PCB board is provided with a master control IC and a display IC, and the lower PCB board is provided with a rectification inverter module, an IPM/PIM module, a bus capacitor, a switching power supply circuit and a current sampling circuit.

6. A frequency converter according to claim 5, characterized in that: the rectification inversion module is fixed on the radiator, and heat dissipation silicone grease is filled between the rectification inversion module and the radiator.

7. A frequency converter according to claim 5, characterized in that: the height of the fins of the radiator is equal to that of the bus capacitor, and the heights of the fins of the radiator and the bus capacitor are both 60mm.

8. A frequency converter according to claim 5, characterized in that: the IPM/PIM module is arranged above the radiator.

9. A frequency converter according to claim 5, characterized in that: the IPM/PIM module is electrically connected with the fan.

10. A frequency converter according to claim 1, characterized in that: the air intake fluting is the rectangular hole, and the grooved size of air intake is 10mm × 3mm.

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