CN107131561B - Air conditioner, electric control plate thereof and protection technology of electric control plate in air conditioner - Google Patents
Air conditioner, electric control plate thereof and protection technology of electric control plate in air conditioner Download PDFInfo
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- CN107131561B CN107131561B CN201710439961.6A CN201710439961A CN107131561B CN 107131561 B CN107131561 B CN 107131561B CN 201710439961 A CN201710439961 A CN 201710439961A CN 107131561 B CN107131561 B CN 107131561B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner and an electric control plate thereof, and a protection process of the electric control plate in the air conditioner, wherein the electric control plate comprises a circuit substrate, a radiating fin, a rectifier bridge stack, a staggered PFC circuit, a filter circuit and an inversion power module, wherein bodies of the rectifier bridge stack, a fast recovery diode, a power switch tube and the inversion power module are fixed on a first surface of the radiating fin, lead-out directions of pins of the fast recovery diode and the power switch tube are consistent and perpendicular to a third surface of the radiating fin, double-row pins of the rectifier bridge stack and the inversion power module are parallel to the third surface and a fourth surface of the radiating fin, a plurality of electrolytic capacitors are soldered on the circuit substrate close to pins of the fast recovery diode and the power switch tube along the third surface of the radiating fin, and at least one electrolytic capacitor is staggered with the pins of the fast recovery diode and the power switch tube, so that three-proofing paint coating is conveniently carried out on the pins of the fast recovery diode and the power switch tube.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an electric control plate of an air conditioner, the air conditioner and a protection process of the electric control plate in the air conditioner.
Background
At present, a technology for cooling a heat generating device by installing a refrigerant pipe on a refrigerant circuit of an air conditioner and using a refrigerant flowing in the refrigerant pipe has been known and started to be applied to the air conditioner. The heat generating devices to be cooled are typically semiconductor power devices, such as IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistors), FRDs (Fast Recovery Diode, fast recovery diodes), rectifier bridge stacks, inverter power modules, etc., and these heat generating devices typically comprise two parts in structure, a body and pins, wherein the body is mounted on a cooling device, the pins are soldered to a circuit substrate, and during operation, the pins of the heat generating devices flow current or voltage signals and make electrical connection with other circuits, and therefore these pins are typically electrically charged.
In the above cooling technique, the refrigerant flowing through the refrigerant pipe takes away heat generated by the cooled device to cool the cooled device. When the temperature of the refrigerant flowing through the refrigerant pipeline and the ambient temperature are in a specific state, the temperature of the refrigerant pipeline, the cooling device or the cooled device is lower than the dew point temperature, so that dew is formed on the surface of the refrigerant pipeline, the cooling device or the cooled device, and the electric insulation performance between the pins of the cooled device and the cooling device is reduced, even short circuit occurs, and the heating device is failed or damaged.
In order to suppress the above-mentioned accidents, the pins of the cooled device need to be coated with a protective coating such as a three-proofing paint so that even if dew water adheres to the surface of the cooling device or the body and pins of the cooled device, the electric performance of the cooled device is not reduced. However, the cooled device is often installed below the cooling device, and when the protective paint such as the three-proofing paint is coated, the pins of the device to be coated may be covered by the cooling device or other surrounding devices, so that it is very difficult to perform the three-proofing paint coating operation on the pins of the device.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, an object of the present invention is to provide an electric control board for an air conditioner, which maintains the lead-out directions of the fast recovery diode and the power switch tube in the cooled device to be consistent and perpendicular to the third surface of the cooling fin, and staggers at least one electrolytic capacitor of the plurality of electrolytic capacitors with the pins of the fast recovery diode and the power switch tube, so as to improve the convenience of three-proofing paint coating on the pins of the cooled device.
Another object of the present invention is to provide an air conditioner.
Another object of the present invention is to provide a protection process for an electric control board in an air conditioner.
In order to achieve the above object, an embodiment of the present invention provides an electric control board for an air conditioner, including: the power circuit comprises a circuit substrate, radiating fins, a rectifier bridge stack, a staggered PFC circuit, a filter circuit and an inversion power module, wherein the staggered PFC circuit comprises a plurality of power circuits which work in a staggered way, each power circuit comprises an inductor, a fast recovery diode and a power switch tube, the filter circuit comprises a plurality of electrolytic capacitors which are connected in parallel, pins of each device in the rectifier bridge stack, the fast recovery diode, the power switch tube and the inversion power module are perpendicular to respective bodies, the bodies of the rectifier bridge stack, the fast recovery diode, the power switch tube and the inversion power module are fixed on a first surface of the radiating fins, pins of the rectifier bridge stack, the fast recovery diode, the power switch tube and the inversion power module are soldered on the circuit substrate, the lead-out directions of the pins of the fast recovery diode and the power switch tube are consistent and are perpendicular to a third surface of the radiating fins, and double rows of pins of the rectifier bridge stack and the inversion power module are respectively parallel to the third surface and the third surface of the radiating fins; the plurality of electrolytic capacitors are soldered on the circuit substrate close to the pins of the fast recovery diode and the power switch tube along the third face of the radiating fin, wherein at least one electrolytic capacitor of the plurality of electrolytic capacitors is staggered with the pins of the fast recovery diode and the power switch tube, so that the fast recovery diode and the pins of the power switch tube can be conveniently coated with the three-proofing paint.
According to the electric control board of the air conditioner, the rectifier bridge, the fast recovery diode, the power switch tube and the body of the inversion power module are fixed on the first face of the radiating fin, pins of the rectifier bridge, the fast recovery diode, the power switch tube and the inversion power module are brazed on the circuit substrate, the leading-out directions of the pins of the fast recovery diode and the power switch tube are kept consistent and perpendicular to the third face of the radiating fin, the double-row pins of the rectifier bridge and the inversion power module are parallel to the third face and the fourth face of the radiating fin, meanwhile, a plurality of electrolytic capacitors are brazed on the circuit substrate close to the pins of the fast recovery diode and the power switch tube along the third face of the radiating fin, and at least one electrolytic capacitor among the electrolytic capacitors is staggered with the pins of the fast recovery diode and the power switch tube, so that three-proofing paint coating can be conveniently carried out on the pins of the fast recovery diode and the power switch tube.
According to one embodiment of the invention, no device with the packaging height larger than a preset height is arranged on the circuit substrate outside the double-row pins of the rectifier bridge stack and the inverter power module, so that three-proofing paint coating is conveniently carried out on the pins of the rectifier bridge stack and the inverter power module.
According to one embodiment of the invention, the inductor is soldered on the circuit substrate near the fourth surface of the heat sink and is located in the opposite direction of the pin-out direction of the fast recovery diode and the power switch tube.
According to one embodiment of the present invention, the circuit substrate is further provided with a power supply terminal, a compressor terminal, and a control circuit unit, wherein the power supply terminal is soldered to the circuit substrate near the fifth surface of the heat sink and the third surface of the heat sink, the compressor terminal is soldered to the circuit substrate near the sixth surface of the heat sink and the third surface of the heat sink, and the electronic component of the control circuit unit is soldered to the circuit substrate near the sixth surface of the heat sink and the fourth surface of the heat sink, wherein the fifth surface of the heat sink is opposite to the sixth surface of the heat sink.
According to an embodiment of the present invention, the electric control board of the air conditioner further includes: and the refrigerant pipeline is fixed on the second surface of the radiating fin, and the second surface of the radiating fin is opposite to the first surface of the radiating fin.
According to one embodiment of the invention, the second face of the fin is provided with a semicircular groove, and the refrigerant pipe is fixed in the semicircular groove.
According to an embodiment of the present invention, the electric control board of the air conditioner further includes: and the radiating fin supporting device is arranged between the first surface of the radiating fin and the circuit substrate and used for supporting the radiating fin.
According to an embodiment of the present invention, the fin support apparatus includes: a first support member and a second support member, the first support member and the second support member being disposed at positions near a fifth face of the heat sink and a sixth face of the heat sink, respectively.
In order to achieve the above object, another embodiment of the present invention provides an air conditioner, which includes the above electric control board.
According to the air conditioner provided by the embodiment of the invention, the electric control plate can effectively improve the convenience of three-proofing paint coating on the pins of the cooled device, so that the assembly speed of the air conditioner is effectively improved.
In order to achieve the above object, an embodiment of the present invention provides a protection process for an electric control board in an air conditioner, where the electric control board includes a circuit substrate and a heat sink, the electric control board is provided with a rectifier bridge stack, an interleaved PFC circuit, a filter circuit, an inverter power module and a control circuit unit, the interleaved PFC circuit includes multiple power circuits that work in an interleaved manner, each power circuit includes an inductor, a fast recovery diode and a power switch tube, the filter circuit includes a plurality of electrolytic capacitors connected in parallel, and the protection process includes the following steps: firstly, fixing the rectifier bridge stack, the fast recovery diode, the power switch tube and the body of the inversion power module on a first surface of the radiating fin, keeping the lead-out directions of pins of the fast recovery diode and the power switch tube consistent and perpendicular to a third surface of the radiating fin, and enabling double-row pins of the rectifier bridge stack and the inversion power module to be parallel to the third surface and a fourth surface of the radiating fin respectively, wherein the fourth surface of the radiating fin is opposite to the third surface of the radiating fin; soldering pins of electronic components of the rectifier bridge stack, the fast recovery diode, the power switch tube, the inversion power module, the inductor and the control circuit unit on the circuit substrate, and soldering electrolytic capacitors staggered with the pins of the fast recovery diode and the power switch tube on the circuit substrate; and finally, detecting the electric control board, and after the electric control board is detected to be qualified, performing three-proofing paint coating on pins of the rectifier bridge stack, the fast recovery diode, the power switch tube and the inversion power module.
According to the protection process of the electric control board in the air conditioner, the rectifier bridge stack, the fast recovery diode, the power switch tube and the body of the inversion power module are fixed on the first face of the radiating fin, the lead-out directions of the pins of the fast recovery diode and the power switch tube are kept consistent and perpendicular to the third face of the radiating fin, and the double-row pins of the rectifier bridge stack and the inversion power module are parallel to the third face and the fourth face of the radiating fin. And then welding the rectifier bridge stack, the fast recovery diode, the power switch tube, the inverter power module, the inductor, the control circuit unit and the electrolytic capacitor staggered with pins of the fast recovery diode and the power switch tube on the circuit substrate. Finally, the electric control board is detected, and after the electric control board is detected to be qualified, three-proofing paint coating is carried out on pins of the rectifier bridge stack, the fast recovery diode, the power switch tube and the inversion power module, so that convenience in three-proofing paint coating on pins of a cooled device is effectively improved, and online detection and maintenance before coating are not affected.
According to one embodiment of the present invention, after three-proofing paint coating is performed on the rectifier bridge stack, the fast recovery diode, the power switch tube and the pins of the inverter power module, the method further comprises: and brazing the rest electrolytic capacitors in the plurality of electrolytic capacitors on a circuit substrate which is close to the lead-out direction of the pins of the fast recovery diode and the power switch tube along the third face of the radiating fin.
Drawings
Fig. 1 is a control circuit diagram of an air conditioner according to an embodiment of the present invention;
fig. 2 is an electric control board of an air conditioner according to an embodiment of the present invention;
FIG. 3 is a perspective view of a heat sink according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of pins of a fast recovery diode and a power switch tube according to one embodiment of the invention;
FIG. 5 is a schematic view of the installation of a cooled device body according to one embodiment of the invention;
FIG. 6 is a schematic diagram of the installation of a cooled device pin according to one embodiment of the invention;
FIG. 7 is a schematic diagram of the installation of a plurality of electrolytic capacitors according to one embodiment of the present invention;
FIG. 8 is a schematic view of the installation of an electrolytic capacitor bank B according to one embodiment of the present invention;
FIG. 9 is a schematic installation of a refrigerant conduit according to one embodiment of the present invention;
FIG. 10 is a schematic view of the structure of a second face of a heat sink according to one embodiment of the invention;
fig. 11 is a block schematic diagram of an air conditioner according to an embodiment of the present invention; and
fig. 12 is a flowchart of a protection process of an electric control board in an air conditioner according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
An electric control board of an air conditioner, an air conditioner and a protection process of the electric control board in the air conditioner according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a control circuit diagram of an air conditioner according to an embodiment of the present invention. As shown in fig. 1, the control circuit of the air conditioner includes a rectifier bridge 511, an interleaved PFC circuit 60, a filter circuit 63, an inverter power module 541, and a control circuit unit 711.
The rectifier bridge 511 is composed of diodes VD1 to VD4, an input end of the rectifier bridge 511 is connected to an ac power Um, and an output end of the rectifier bridge 511 is connected to the interleaved PFC circuit 60. The interleaved PFC circuit 60 includes multiple power circuits that operate in interleaved fashion, each of which may include an inductor, a fast recovery diode, and a power switch. Taking three-way interleaved PFC circuits as an example, the first power circuit includes an inductor 621, a fast recovery diode 521 and a power switch tube 531, the second power circuit includes an inductor 622, a fast recovery diode 522 and a power switch tube 532, and the third power circuit includes an inductor 623, a fast recovery diode 523 and a power switch tube 533. The filter circuit 63 includes a plurality of electrolytic capacitors 631-634 connected in parallel. The inverter power module 541 is composed of power switching tubes Q1 to Q6, and an output end of the inverter power module 541 is connected to the compressor motor M. The control circuit unit 711 is connected to the power switching transistors 531-533 and the power switching transistors Q1-Q6, respectively, so as to control the interleaved PFC circuit and the compressor motor M by controlling the power switching transistors.
In practical application, an electric control board is designed according to the control circuit, and a cooling device (such as a cooling fin and a refrigerant pipeline) is arranged above the electric control board to cool a heat generating device by using a refrigerant in the refrigerant pipeline of the air conditioner, wherein the heat generating device (also referred to as a cooled device) comprises a rectifier bridge stack 511, fast recovery diodes 521-523, power switching tubes 531-533 and an inverter power module 541. In consideration of the fact that condensation water is formed on the surfaces of a refrigerant pipeline, a cooling fin or a cooled device due to the influence of temperature in the operation process of the air conditioner, the electric insulation performance between the pins of the cooled device and the cooling fin is reduced, even short circuits occur, and the heating device is broken down or damaged, so that the pins of the cooled device are required to be coated with the three-proofing paint. In order to facilitate the three-proofing paint coating, the pin layout of the device and the like need to be considered in the design of the electric control board.
Fig. 2 is an electric control board of an air conditioner according to an embodiment of the present invention. As shown in fig. 2, the electric control board of the air conditioner may include: the power circuit comprises a circuit substrate 611, a radiating fin 311, a rectifier bridge 511, an interleaved PFC circuit 60, a filter circuit 63, an inverter power module 541 and a control circuit unit 711, wherein the interleaved PFC circuit 60 comprises three power circuits which are in parallel and interleaved operation, the first power circuit comprises an inductor 621, a fast recovery diode 521 and a power switch tube 531, the second power circuit comprises an inductor 622, a fast recovery diode 522 and a power switch tube 532, and the third power circuit comprises an inductor 623, a fast recovery diode 523 and a power switch tube 533.
The pins of each device in the rectifier bridge 511, the fast recovery diodes 521-523, the power switching transistors 531-533, and the inverter power module 541 are perpendicular to the respective body. The bodies of the rectifier bridge stack 511, the fast recovery diodes 521-523, the power switching tubes 531-533 and the inverter power module 541 are fixed to the first face 311a of the heat sink, the pins of the rectifier bridge stack 511, the fast recovery diodes 521-523, the power switching tubes 531-533 and the inverter power module 541 are soldered to the circuit substrate 611, and the pin extraction directions of the fast recovery diodes 521-523 and the power switching tubes 531-533 are kept consistent and perpendicular to the third face 311c of the heat sink, i.e., perpendicular to the long side of the heat sink 311 shown in fig. 2, and the double-row pins of the rectifier bridge stack 511 and the inverter power module 541 are respectively parallel to the third face and the fourth face of the heat sink 311, i.e., parallel to the long side of the heat sink 311 shown in fig. 2, wherein the fourth face 311d of the heat sink is opposite to the third face 311c of the heat sink.
The plurality of electrolytic capacitors 631-634 are soldered on the circuit substrate 611 near the pins of the fast recovery diodes 521-523 and the power switches 531-533 along the third face 311c of the heat sink, wherein at least one of the plurality of electrolytic capacitors 631-634 is offset from the pins of the fast recovery diodes 521-523 and the power switches 521-523, so as to facilitate the three-proofing paint coating of the pins of the fast recovery diodes 521-523 and the power switches 531-533.
According to an embodiment of the present invention, as shown in fig. 2, the rectifier bridge stack 511 and the inverter power module 541 are soldered on the circuit substrate 611 near the fifth surface 311e of the heat sink and the sixth surface 311f of the heat sink, respectively, and no device with a package height greater than a preset height, that is, no electronic component with a package height is disposed on the circuit substrate 611 outside the double-row pins of the rectifier bridge stack 511 and the inverter power module 541, so as to facilitate three-proofing paint coating on the pins of the rectifier bridge stack 511 and the inverter power module 541. The inductors 621-623 are soldered to the circuit substrate 611 near the fourth face 311d of the heat sink and are located in the opposite direction to the pin-out direction of the fast recovery diodes 521-523 and the power switching transistors 521-523. Wherein the fifth face 311e of the heat sink is opposite the sixth face 311f of the heat sink.
Further, according to an embodiment of the present invention, as shown in fig. 2, a power supply terminal 651, a compressor terminal 661, and a control circuit unit 711 are further provided on the circuit substrate 611. Wherein the power connection terminal 651 is soldered to the circuit substrate 611 near the fifth face 311e of the heat sink and the third face 311c of the heat sink, the compressor connection terminal 661 is soldered to the circuit substrate 611 near the sixth face 311f of the heat sink and the third face 311c of the heat sink, and the electronic components of the control circuit unit 711 are soldered to the circuit substrate 611 near the sixth face 311f of the heat sink and the fourth face 311d of the heat sink.
In order to describe the mounting position of the device, in the embodiment of the present invention, the heat sink 311 is described with reference to the heat sink 311, and the heat sink 311 may have a rectangular cube structure. As shown in fig. 3, a surface facing the circuit substrate 611 is defined as a first surface 311a of the heat sink; the side opposite to the first side 311a is defined as a second side 311b of the fin; a surface of the fin 311 corresponding to a direction rotated 90 ° clockwise around the y-axis is defined as a third surface 311c of the fin with reference to the first surface 311a of the fin; one surface corresponding to the third surface 311c of the fin is defined as a fourth surface 311d of the fin; a surface of the fin 311 corresponding to a direction rotated counterclockwise by 90 ° about the z-axis is defined as a fifth surface 311e of the fin with reference to the first surface 311a of the fin; the face corresponding to the fifth face 311e of the heat sink is defined as a sixth face 311f of the heat sink.
Specifically, in order TO facilitate cooling, the cooled devices (rectifier bridge stack 511, fast recovery diodes 521-523, power switching tubes 531-533, and inverter power module 541) are disposed between the circuit substrate 611 and the first surface 311a of the heat sink, where the cooled devices structurally include two parts of a body and pins, and the pins are In a vertical direction (a part of the devices are In a vertical direction or an approximately vertical direction with respect TO the body due TO packaging characteristics), for example, the inverter power module 541 adopts a DIP (Dual In-line Package) packaging mode, two columns of pins are vertically distributed on two sides of the device body, and after a part of the devices are processed by a molding process, the pins of the fast recovery diodes 521-523 and the power switching tubes 531-533 are In an approximately vertical direction with respect TO the body, for example, the fast recovery diodes 521-523 and the power switching tubes 531-533 are packaged by a TO (trans Out-line, transistor outline), as shown In fig. 4, the pins of the fast recovery diodes 521-523 and the power switching tubes 531-533 are processed and formed In an approximately vertical direction with respect TO the body. As shown in fig. 5, the rectifier bridge 511 includes a pin 511a and a body 511b, the fast recovery diodes 521-523 include pins 521a-523a and bodies 521b-523b, the power switching transistors 531-533 include pins 531a-533a and bodies 531b-533b, and the inverter power module 541 includes a pin 541a and a body 541b. Wherein the body of the cooled device is fixed to the first surface 311a of the heat sink by screws (as shown in fig. 5), and the pins of the cooled device pass through the pad through holes of the circuit substrate 611 and are soldered (including but not limited to reflow soldering, wave soldering, manual soldering, etc.) to the bottom layer of the circuit substrate 611 (as shown in fig. 6).
Since the cooled device is located directly below the first face 311a of the heat sink, the tri-proof paint coating operation of the cooled device pins 511a, 521a-523a, 531a-533a, 541a cannot be performed from directly above, but can be performed from the side. The arrangement of the inductors 621 to 623 and the plurality of electrolytic capacitors 631 to 634 on both sides of the fast recovery diodes 521 to 523 and the power switching transistors 531 to 533, respectively, is an optimal circuit layout in view of circuit wiring, electromagnetic compatibility, noise of electric signals, and the like, and according to the circuit topology. For example, the inductors 621 to 623 are soldered to the circuit board 611 near the fourth face 311d of the heat sink, and the plurality of electrolytic capacitors 631 to 634 are soldered to the circuit board 611 near the third face 311c of the heat sink. The inductors 621-623 and the electrolytic capacitors 631-634 have a certain height, so that the difficulty of three-proofing paint coating operation on the pins 521a-523a and 531a-533a of the cooled device is increased from the side, and the heights of the power connection terminal 651, the compressor connection terminal 661 and the control circuit unit 711 are limited, so that the three-proofing paint coating operation on the pins of the rectifier bridge stack 511 and the inverter power module 541 from the side is not hindered.
Thus, to address the above-described challenges, the directions of the pins 521a-523a of the fast recovery diode and the pins 531a-533a of the power switch can be kept consistent, e.g., the pins 521a-523a of the fast recovery diode and the pins 531a-533a of the power switch are both close to the third face 311c of the heat sink, which facilitates concentrated application of the tri-proof paint to these pins. Meanwhile, the plurality of electrolytic capacitors 631-634 are assembled on the same side of the pins of the cooled device, and at least one electrolytic capacitor 631-634 is ensured to be staggered with the pins of the fast recovery diodes 521-523 and the power switch tubes 531-533, for example, the pins of the electrolytic capacitor 634 are staggered with the pins of the fast recovery diodes and the power switch tubes, so that the pins of the cooled device are not blocked from the side after the electrolytic capacitor 634 is installed.
In addition, in order to prevent the power device from causing the air conditioner to be unable to normally operate due to the reasons such as cold joint or damage, before the device to be cooled is coated with protective paint such as three-proofing paint, the electric control board is electrified for on-line detection. Because the load power level of the on-line detection is not required to be large, a small amount of electrolytic capacitors (such as one electrolytic capacitor) can bear the function of all the smoothing capacitors during the on-line detection, and meanwhile, in order to further improve the convenience of the three-proofing paint coating, a plurality of electrolytic capacitors can be assembled and welded in groups in batches.
Specifically, as shown in fig. 7, the plurality of electrolytic capacitors 631 to 634 may be divided into two groups, one group being: an electrolytic capacitor group A which shields the pin coating of the device from the side surface, comprising electrolytic capacitors 631-633; the other group is: the electrolytic capacitor group B, which does not block the device pin coating from the side, includes the electrolytic capacitor 634. Before the device pins are subjected to a protective paint coating operation such as three-proofing paint, as shown in fig. 8, only the electrolytic capacitor group B is assembled and soldered on the circuit substrate 611 (other devices except the electrolytic capacitor group a are assembled and soldered on the circuit substrate 611), and the electric control board is subjected to power-on-line detection. In the detection process, as the coating operation of the three-proofing paint is not performed, when abnormality is found, the abnormal part can be conveniently maintained; if the on-line detection result is qualified, the device to be cooled can be subjected to three-proofing paint coating, and since the electrolytic capacitor group A is not assembled, enough space is left on one side of the pins 521a-523a and 531a-533a of the device to be cooled, and at this time, the pins 521a-523a and 531a-533a of the device to be cooled can be conveniently subjected to three-proofing paint coating from the side, for example, three-proofing paint and other protective paint coating can be coated on the pins of the device by using a dropper injector or pen and other methods. After the coating is completed, the electrolytic capacitor group a is assembled and soldered. Therefore, the problem that the pins of the cooled device are coated with protective paint such as three-proofing paint is solved, and whether the electric control board can work normally or not can be detected on line.
According to the electric control board of the air conditioner, the pin leading-out directions of the fast recovery diode and the power switch tube in the cooled device are kept consistent and perpendicular to the long side of the radiating fin, the double-row pins of the rectifier bridge stack and the inversion power module in the cooled device are parallel to the long side of the radiating fin, at least one electrolytic capacitor in the plurality of electrolytic capacitors is staggered with the pins of the fast recovery diode and the power switch tube, and electronic components with the packaging height higher than the preset height are not arranged on the circuit substrate outside the double-row pins of the rectifier bridge stack and the inversion power module. Therefore, the space layout is carried out on the pins of the cooled device, and the electrolytic capacitors are assembled and soldered in batches, so that the convenience of coating protective paint such as three-proofing paint on the pins of the cooled device is ensured, and meanwhile, the online detection and maintenance before coating are not influenced.
Further, according to an embodiment of the present invention, as shown in fig. 9 and 10, the electric control board of the air conditioner further includes a refrigerant pipe 111, the refrigerant pipe 111 is fixed on the second surface 311b of the heat sink, the second surface 311b of the heat sink is provided with a semicircular groove, and the refrigerant pipe 111 is fixed in the semicircular groove.
Specifically, after the assembly and welding of all the power devices are completed, the refrigerant pipe 111 is fixed in the semicircular groove of the second surface 311b of the heat sink by the fixing member 211, and the heat generated by the cooled device is taken away by the refrigerant flowing in the refrigerant pipe 111 to achieve the optimal cooling effect. Since the refrigerant pipe 111 is disposed in the semicircular groove, not only can the stability of the installation of the refrigerant pipe 111 be ensured, but also the compression damage of the refrigerant pipe 111 and the like can be prevented.
According to an embodiment of the present invention, as shown in fig. 2, the electric control board of the air conditioner further includes a heat sink supporting device, and the heat sink supporting device is disposed between the first surface 311a of the heat sink and the circuit substrate 611, for supporting the heat sink 311.
Further, as shown in fig. 2, the fin support apparatus may include: the first support member 412 and the second support member 411, the first support member 412 and the second support member 411 being disposed at positions near the fifth face 311e of the heat sink and the sixth face 311f of the heat sink, respectively.
Specifically, if the heat sink supporting means is not provided between the first surface 311a of the heat sink and the circuit board 611, the weight of the heat sink 311 and the like is borne by the device to be cooled, which may lead to breakage of the pins of the device to be cooled and the like over a long period of time, and therefore, the heat sink supporting means may be installed between the heat sink 311 and the circuit board 611 to achieve a supporting and fixing effect. For example, a first support member 412 and a second support member 411 may be installed at both ends of the heat sink 311, respectively, to protect the cooled device.
In summary, according to the electric control board of the air conditioner provided by the embodiment of the invention, the pins of the cooled device are spatially distributed, and the electrolytic capacitors are assembled and soldered in batches, so that the convenience of coating protective paint such as three-proofing paint on the pins of the cooled device is ensured, and meanwhile, the on-line detection and maintenance before coating are not influenced.
Fig. 11 is a block schematic diagram of an air conditioner according to an embodiment of the present invention. As shown in fig. 11, the air conditioner 1000 includes the electric control board 100 of the air conditioner described above.
According to the air conditioner provided by the embodiment of the invention, the electric control plate can effectively improve the convenience of three-proofing paint coating on the pins of the cooled device, so that the assembly speed of the air conditioner is effectively improved.
Fig. 12 is a flowchart of a protection process of an electric control board in an air conditioner according to an embodiment of the present invention.
In the embodiment of the invention, as shown in fig. 2, the electric control board may include a circuit substrate and a heat sink, and the electric control board is provided with a rectifier bridge stack, an interleaved PFC circuit, a filter circuit, an inverter power module and a control circuit unit, where the interleaved PFC circuit includes multiple power circuits that work in an interleaved manner, each power circuit may include an inductor, a fast recovery diode and a power switch tube, and the filter circuit may include multiple electrolytic capacitors connected in parallel.
As shown in fig. 12, the protection process of the electric control board in the air conditioner may include the following steps:
s1, fixing the bodies of the rectifier bridge stack, the fast recovery diode, the power switch tube and the inversion power module on the first surface of the radiating fin, enabling the lead-out directions of the pins of the fast recovery diode and the power switch tube to be consistent and perpendicular to the third surface of the radiating fin, and enabling the double-row pins of the rectifier bridge stack and the inversion power module to be parallel to the third surface and the fourth surface of the radiating fin respectively, wherein the fourth surface of the radiating fin is opposite to the third surface of the radiating fin.
And S2, soldering pins of electronic components of the rectifier bridge stack, the fast recovery diode, the power switch tube, the inverter power module, the inductor and the control circuit unit on the circuit substrate, and soldering electrolytic capacitors staggered with the pins of the fast recovery diode and the power switch tube on the circuit substrate.
And S3, detecting the electric control board, and after the electric control board is detected to be qualified, performing three-proofing paint coating on pins of the rectifier bridge stack, the fast recovery diode, the power switch tube and the inversion power module.
According to one embodiment of the invention, after three-proofing paint coating is performed on pins of a rectifier bridge stack, a fast recovery diode, a power switch tube and an inverter power module, the three-proofing paint coating method further comprises the following steps: and brazing the rest electrolytic capacitors in the plurality of electrolytic capacitors on the circuit substrate which is close to the pin leading-out direction of the fast recovery diode and the power switch tube along the third face of the radiating fin.
Specifically, when the electric control board is assembled, the body of the cooled device (rectifier bridge stack, fast recovery diode, power switch tube and inverter power module) can be fixed on the first surface of the cooling fin through screws according to fig. 5, and pins of the cooled device pass through pad through holes of the circuit substrate and are soldered on the bottom layer of the circuit substrate according to fig. 6. The directions of the pins of the fast recovery diode and the pins of the power switch tube are kept consistent and perpendicular to the long sides of the radiating fins, and two columns of pins of the rectifier bridge stack and the inverter power module are parallel to the long sides of the radiating fins, for example, the pins of the fast recovery diode and the pins of the power switch tube are close to the third face of the radiating fins, and the two columns of pins of the rectifier bridge stack and the inverter power module are close to the third face and the fourth face of the radiating fins respectively, so that concentrated coating of three-proofing paint is conveniently carried out on the pins.
Then, the inductor, the power connection terminal, the compressor connection terminal, the control circuit unit and any one of the electrolytic capacitors (e.g., electrolytic capacitor bank 634) are soldered on the circuit substrate as shown in fig. 2, and the electric control board is energized for on-line detection. In the detection process, as the coating operation of the three-proofing paint is not performed, when abnormality is found, the abnormal part can be conveniently maintained; if the on-line detection result is qualified, the device to be cooled can be coated with the three-proofing paint, and since the residual electrolytic capacitors (such as electrolytic capacitors 631-633) are not assembled, enough space is reserved on one side of the pin of the device to be cooled, the pin of the device to be cooled can be conveniently coated with the three-proofing paint from the side, for example, the three-proofing paint is coated on the pin of the device by using a dropper injector or pen and other methods. After the coating is completed, the residual electrolytic capacitor is assembled and soldered. Therefore, the space layout is carried out on the pins of the cooled device, and the electrolytic capacitors are assembled and soldered in batches, so that the convenience of coating protective paint such as three-proofing paint on the pins of the cooled device can be ensured, and meanwhile, the online detection and maintenance before coating are not influenced.
It should be noted that, for details not disclosed in the protection process of the electric control board in the air conditioner in the embodiment of the present invention, please refer to details disclosed in the electric control board in the air conditioner in the embodiment of the present invention, and details are not described here again.
According to the protection process of the electric control board in the air conditioner, the rectifier bridge stack, the fast recovery diode, the power switch tube and the body of the inversion power module are fixed on the first face of the radiating fin, the lead-out directions of the pins of the fast recovery diode and the power switch tube are kept consistent and perpendicular to the third face of the radiating fin, and the double-row pins of the rectifier bridge stack and the inversion power module are parallel to the third face and the fourth face of the radiating fin. And then the rectifier bridge stack, the fast recovery diode, the power switch tube, the inverter power module, the inductor, the control circuit unit and the electrolytic capacitor staggered with pins of the fast recovery diode and the power switch tube are soldered on the circuit substrate. Finally, the electric control board is detected, and after the electric control board is detected to be qualified, three-proofing paint coating is carried out on pins of the rectifier bridge stack, the fast recovery diode, the power switch tube and the inversion power module, so that convenience in three-proofing paint coating on pins of a cooled device is effectively improved, and online detection and maintenance before coating are not affected.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (11)
1. An electric control board of an air conditioner, comprising: the power circuit comprises a circuit substrate, radiating fins, a rectifier bridge stack, an interleaved PFC circuit, a filter circuit and an inversion power module, wherein the interleaved PFC circuit comprises power circuits which work in a multipath way, each power circuit comprises an inductor, a fast recovery diode and a power switch tube, the filter circuit comprises a plurality of electrolytic capacitors which are connected in parallel, pins of each device in the rectifier bridge stack, the fast recovery diode, the power switch tube and the inversion power module are vertical to respective bodies,
the rectifier bridge pile, the fast recovery diode, the power switch tube and the inversion power module are fixed on the first surface of the radiating fin, pins of the rectifier bridge pile, the fast recovery diode, the power switch tube and the inversion power module are soldered on the circuit substrate, the lead-out directions of the pins of the fast recovery diode and the power switch tube are consistent and perpendicular to the third surface of the radiating fin, and double-row pins of the rectifier bridge pile and the inversion power module are parallel to the third surface and the fourth surface of the radiating fin respectively, wherein the fourth surface of the radiating fin is opposite to the third surface of the radiating fin;
the plurality of electrolytic capacitors are soldered on the circuit substrate close to the pins of the fast recovery diode and the power switch tube along the third face of the radiating fin, wherein at least one electrolytic capacitor in the plurality of electrolytic capacitors is staggered with the pins of the fast recovery diode and the power switch tube so as to facilitate three-proofing paint coating on the pins of the fast recovery diode and the power switch tube;
and the refrigerant pipeline is fixed on the second surface of the radiating fin.
2. The electric control board of the air conditioner according to claim 1, wherein no device with a packaging height larger than a preset height is arranged on the circuit substrate outside the double-row pins of the rectifier bridge stack and the inverter power module, so that three-proofing paint coating is conveniently carried out on the pins of the rectifier bridge stack and the inverter power module.
3. The electric control board of an air conditioner of claim 2, wherein the inductor is soldered on the circuit substrate near the fourth face of the heat sink and is located in the opposite direction of the pin-out direction of the fast recovery diode and the power switching tube.
4. The electric control board of an air conditioner according to claim 3, wherein the circuit substrate is further provided with a power connection terminal, a compressor connection terminal, and a control circuit unit, wherein the power connection terminal is soldered to the circuit substrate near the fifth face of the heat sink and the third face of the heat sink, the compressor connection terminal is soldered to the circuit substrate near the sixth face of the heat sink and the third face of the heat sink, and the electronic component of the control circuit unit is soldered to the circuit substrate near the sixth face of the heat sink and the fourth face of the heat sink, wherein the fifth face of the heat sink is opposite to the sixth face of the heat sink.
5. The electric control panel of an air conditioner as set forth in any one of claims 1 to 4, further comprising: the second surface of the radiating fin is opposite to the first surface of the radiating fin, and the first surface of the radiating fin faces the circuit substrate.
6. The electric control panel of an air conditioner as set forth in claim 5, wherein the second face of the heat sink is provided with a semicircular groove, and the refrigerant pipe is fixed in the semicircular groove.
7. The electric control panel of an air conditioner as set forth in claim 1, further comprising: and the radiating fin supporting device is arranged between the first surface of the radiating fin and the circuit substrate and used for supporting the radiating fin.
8. The electric control panel of an air conditioner as set forth in claim 7, wherein said heat sink supporting means comprises: a first support member and a second support member, the first support member and the second support member being disposed at positions near a fifth face of the heat sink and a sixth face of the heat sink, respectively.
9. An air conditioner comprising the electric control board of the air conditioner as set forth in any one of claims 1 to 8.
10. The utility model provides a protection technology of automatically controlled board in air conditioner, its characterized in that, automatically controlled board includes circuit substrate and fin, automatically controlled board is equipped with rectifier bridge heap, crisscross PFC circuit, filter circuit, contravariant power module and control circuit unit, crisscross PFC circuit includes multichannel crisscross power circuit that works, and wherein each power circuit all includes inductance, fast recovery diode and power switch tube, filter circuit includes a plurality of electrolytic capacitor that connect in parallel, protection technology includes the following steps:
firstly, fixing the rectifier bridge stack, the fast recovery diode, the power switch tube and the body of the inversion power module on a first surface of the radiating fin, keeping the lead-out directions of pins of the fast recovery diode and the power switch tube consistent and perpendicular to a third surface of the radiating fin, and enabling double-row pins of the rectifier bridge stack and the inversion power module to be parallel to the third surface and a fourth surface of the radiating fin respectively, wherein the fourth surface of the radiating fin is opposite to the third surface of the radiating fin;
soldering pins of electronic components of the rectifier bridge stack, the fast recovery diode, the power switch tube, the inversion power module, the inductor and the control circuit unit on the circuit substrate, and soldering electrolytic capacitors staggered with the pins of the fast recovery diode and the power switch tube on the circuit substrate;
and finally, detecting the electric control board, and after the electric control board is detected to be qualified, performing three-proofing paint coating on pins of the rectifier bridge stack, the fast recovery diode, the power switch tube and the inversion power module.
11. The protection process of an electric control board in an air conditioner according to claim 10, further comprising, after three-proofing paint coating is performed on pins of the rectifier bridge stack, the fast recovery diode, the power switching tube and the inverter power module:
and brazing the rest electrolytic capacitors in the plurality of electrolytic capacitors on a circuit substrate which is close to the lead-out direction of the pins of the fast recovery diode and the power switch tube along the third face of the radiating fin.
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| CN201710439961.6A CN107131561B (en) | 2017-06-12 | 2017-06-12 | Air conditioner, electric control plate thereof and protection technology of electric control plate in air conditioner |
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| CN108063108A (en) * | 2018-01-22 | 2018-05-22 | 广安市嘉乐电子科技有限公司 | A kind of MB bridges heap bonding machine |
| WO2019237637A1 (en) * | 2018-06-13 | 2019-12-19 | 广东美的制冷设备有限公司 | Highly integrated intelligent power module and electrical device |
| CN110749071A (en) * | 2018-07-24 | 2020-02-04 | 广东美的制冷设备有限公司 | Electric control assembly and air conditioner |
| CN108895634B (en) * | 2018-07-26 | 2020-07-03 | 奥克斯空调股份有限公司 | Compressor control method and device |
| FR3087614B1 (en) * | 2018-10-19 | 2020-10-09 | Sagemcom Energy & Telecom Sas | ELECTRICAL BOARD INCLUDING A RECOVERY BRIDGE |
| WO2023115773A1 (en) * | 2021-12-24 | 2023-06-29 | 广东美的制冷设备有限公司 | Electric control board, air conditioner outdoor unit, and air conditioner |
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| JPH0832007A (en) * | 1994-07-08 | 1996-02-02 | Sumitomo Electric Ind Ltd | Semiconductor device and semiconductor device assembly |
| JP3455386B2 (en) * | 1997-01-22 | 2003-10-14 | 三菱電機株式会社 | Inverter control circuit device for air conditioner |
| JP4488087B2 (en) * | 2008-04-24 | 2010-06-23 | ダイキン工業株式会社 | Power circuit mounting unit and motor drive device |
| CN207394974U (en) * | 2017-06-12 | 2018-05-22 | 广东美的暖通设备有限公司 | Air conditioner and its electric-controlled plate |
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