Multi-path staggered PFC circuit, power factor correction device and air conditioner frequency converter

Abstract

The utility model relates to a multi-path staggered PFC circuit, a power factor correction device and an air conditioner frequency converter, and relates to power factor correction. The circuit comprises a plurality of PFC branches which are connected in parallel in a staggered manner, wherein any PFC branch comprises an inductor, a diode and an IGBT switch tube; wherein one end of the inductor is connected with a direct-current voltage input end, and the other end of the inductor is connected with an anode of the diode and a collector electrode of the IGBT switch tube; the cathode of the diode is connected with the anode of the direct-current voltage output end; an emitting electrode of the IGBT switch tube is connected with a negative electrode of the direct-current voltage output end; wherein the inductors are aluminum wire inductors, and the aluminum wire inductors in the multiple PFC branches are arranged in a staggered mode. According to the circuit, the ripple current is reduced, the energy loss is reduced, the overall efficiency of the power supply is improved, the occupied space of the inductor is reduced, and the miniaturization design of the frequency converter is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power factor correction, in particular to a multi-path interleaved PFC circuit, a power factor correction device and an air conditioner frequency converter. BACKGROUND

[0002] The PFC (Power Factor Correction) circuit is an indispensable part of modern power electronic equipment, especially in large power appliances such as air conditioner frequency converters. The main function of the PFC circuit is to improve the power factor of the power supply, so that the input current waveform is as close to a sine wave as possible, thereby reducing harmonic distortion and improving the overall efficiency and performance of the system.

[0003] The single-path PFC circuit in the related art is generally composed of a group of diodes, power semiconductor switching devices (such as IGBT or MOSFET) and inductors. Its working principle is that in each alternating current cycle, the inductor current presents a single triangular waveform through the rapid switching operation of the switching device. Although this design is simple in structure and easy to implement, it has the disadvantages of large ripple current, low power supply efficiency, complex thermal management, etc. In order to overcome the above-mentioned shortcomings of the single-path PFC circuit, the multi-path interleaved PFC circuit has emerged. This circuit uses multiple groups of switching elements to significantly improve performance through a multi-path interleaved working mode. However, the multi-path interleaved PFC circuit in the related art mainly uses copper wire inductors, which has the problem of high circuit cost.

[0004] In view of the above problems in the related art, no effective solution has been proposed so far. CONTENT OF THE UTILITY MODEL

[0005] The multi-path interleaved PFC circuit, the power factor correction device and the air conditioner frequency converter provided by the embodiments of the present application at least solve the problems of large ripple current, low power supply efficiency, complex thermal management and high cost of the PFC circuit in the related art.

[0006] In order to solve the above problems, in one aspect of the embodiments of the present application, a multi-path interleaved PFC circuit is provided, which comprises a plurality of PFC branches connected in parallel in an interleaved manner,

[0007] Any PFC branch comprises an inductor, a diode and an IGBT switching tube; wherein one end of the inductor is connected with a direct current voltage input end, and the other end is connected with an anode of the diode and a collector of the IGBT switching tube respectively; a cathode of the diode is connected with a positive electrode of a direct current voltage output end; an emitter of the IGBT switching tube is connected with a negative electrode of the direct current voltage output end;

[0008] Among them, the inductor is an aluminum wire inductor, and the aluminum wire inductors in the multi-path PFC branches are arranged in an interleaved manner.

[0009] In some embodiments, the circuit further comprises a bridge rectifier circuit and a direct current output capacitor; wherein the input end of the bridge rectifier circuit is connected with the alternating current power supply, the positive output end of the bridge rectifier circuit is connected with the aluminum wire inductance in the multi-channel PFC branch respectively, the negative output end of the bridge rectifier circuit is connected with the negative pole of the direct current voltage output end; one end of the direct current output capacitor is connected with the positive pole of the direct current voltage output end, and the other end is connected with the negative pole of the direct current voltage output end.

[0010] In some embodiments, the aluminum wire inductance satisfies: 25cm 3 / kw≤(L*W*H) / P≤50cm 3 / kw; wherein L, W and H are the inductance length, inductance width and inductance height of the aluminum wire inductance, respectively, and the unit is mm; and P is the inductance power of the aluminum wire inductance, and the unit is kw.

[0011] In some embodiments, the aluminum wire inductance satisfies: 2.2A / mm 2 ≤I / D≤8.6A / mm 2 ; wherein I is the current flowing through the aluminum wire inductance, and the unit is A; and D is the cross-sectional area of the aluminum wire of the aluminum wire inductance, and the unit is mm 2 .

[0012] In some embodiments, the circuit comprises two-channel PFC branches or three-channel PFC branches.

[0013] In some embodiments, the aluminum wire inductance is a base inductance and / or a baseless inductance; the shape of the aluminum wire inductance is circular and / or square; and the winding shape of the aluminum wire inductance is circular and / or flat.

[0014] To solve the above problems, an aspect of an embodiment of the present application provides a power factor correction device, which comprises any one of the above multi-channel staggered PFC circuits.

[0015] To solve the above problems, an aspect of an embodiment of the present application provides an air conditioner frequency converter, which comprises any one of the above multi-channel staggered PFC circuits.

[0016] In some embodiments, the power range of the air conditioner frequency converter is [1.5kw, 7.5kw], and the wire diameter range of the aluminum wire inductance in the multi-channel staggered PFC circuit is [1mm, 3mm].

[0017] In some embodiments, the area S of the air conditioner frequency converter satisfies: 150cm 2 ≤S≤600cm 2 , and the contact area S1 of the aluminum wire inductance and the electric control board in the multi-channel staggered PFC circuit satisfies: 8cm 2 ≤S1≤60cm2 , and the ratio of the contact area S1 to the area S of the air conditioner frequency converter satisfies: 0.05≤S1 / S≤0.1.

[0018] The utility model embodiment's beneficial effect: through adopt a kind of including multiple road and staggered parallel connection PFC branch's multiple road staggered PFC circuit, any one PFC branch in the current includes inductance, diode and IGBT switch tube;Wherein, inductance one end is connected with direct current voltage input terminal, other end is respectively connected with diode anode, IGBT switch tube collector;Diode cathode is connected with the positive pole of direct current voltage output terminal;IGBT switch tube emitter is connected with the negative pole of direct current voltage output terminal;Wherein, inductance is aluminium wire inductance, and aluminium wire inductance staggered arrangement in multiple road PFC branch, overcome the problem of higher cost caused by copper wire inductance in related art only using single road PFC circuit exists ripple current is larger, power efficiency is lower, thermal management is complex, using multiple road PFC circuit, to provide a multiple road staggered PFC circuit, and using aluminium wire inductance in circuit, to reduce the circuit cost, multiple road staggered operation can effectively reduce ripple current, reduce energy loss, to further improve the overall efficiency of power supply, and through aluminium wire inductance staggered arrangement in multiple road PFC branch, reduce inductance occupied space, be favorable to realizing the technical effect of frequency converter miniaturization design.

[0019] The details of one or more embodiments of the present utility model are presented in the following drawings and description, so that other features, objects and advantages of the present utility model are more concise and easy to understand. DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present utility model, and for those skilled in the art, other embodiments can also be obtained from these drawings without creating labor.

[0021] Figure 1 is the topological schematic diagram of the multiple road staggered PFC circuit of one embodiment of the embodiment of the present utility model.

[0022] Figure 2 is the schematic diagram of aluminium wire inductance of one embodiment of the embodiment of the present utility model.

[0023] Figure 3 is the schematic diagram of aluminium wire inductance of another embodiment of the embodiment of the present utility model. DETAILED DESCRIPTION

[0024] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0025] In related technologies, a single-channel PFC circuit generally consists of a set of diodes, power semiconductor switching devices (such as IGBTs or MOSFETs), and an inductor. Its working principle is that in each AC cycle, the inductor current presents a single triangular waveform through the rapid switching operation of the switching devices. Although this design is simple in structure and easy to implement, it has the following disadvantages: (1) Large ripple current: Since only one set of switching elements is working, the ripple component in the output current is high, which affects the stability of DC output. (2) Low power efficiency: The large ripple current increases energy loss and reduces power conversion efficiency. (3) Complex thermal management: High ripple current also causes additional heat generation problems, increasing the difficulty of heat dissipation design.

[0026] To overcome the aforementioned shortcomings of single-channel PFC circuits, multi-channel interleaved PFC circuits were developed. This circuit employs multiple sets of switching elements, significantly improving performance through interleaved operation. Despite the numerous advantages of multi-channel interleaved PFC circuits, some challenges remain in practical applications, such as cost: currently, most multi-channel interleaved PFC circuits use copper wire inductors. In recent years, the continuous rise in copper prices has led to a steady increase in the cost of copper wire inductors, putting pressure on manufacturers' cost control.

[0027] To address the aforementioned problems, this utility model provides a multi-channel interleaved PFC circuit, such as... Figure 1 As shown, the multi-channel interleaved PFC circuit mainly includes: multiple PFC branches connected in an interleaved parallel configuration, each PFC branch including an inductor, a diode, and an IGBT switch; wherein, one end of the inductor is connected to the DC voltage input terminal, and the other end is connected to the anode of the diode and the collector of the IGBT switch respectively; the cathode of the diode is connected to the positive terminal of the DC voltage output terminal.

[0028] The emitter of the IGBT switching transistor is connected to the negative terminal of the DC voltage output; the inductor is an aluminum wire inductor, and the aluminum wire inductors in the multiple PFC branches are arranged alternately.

[0029] With the above arrangement, the utility model discloses a kind of multi-channel staggered PFC circuit using aluminum wire inductance, compared with copper wire inductance in the related art, the cost of aluminum wire inductance is significantly reduced, using aluminum wire inductance can effectively control manufacturing cost, this is particularly important for mass production and application.Meanwhile, multi-channel PFC branch uses staggered parallel connection design, so that the current waveform of multiple aluminum wire inductances is staggered and overlapped, so that total ripple current is significantly reduced, and smaller ripple current reduces energy loss, improves the overall conversion efficiency of power supply;And smaller ripple current means less high-frequency noise generation, thereby reducing the risk of electromagnetic interference, simplifying the design of EMI filter.And the total current is shared by the multiple IGBT switching tubes in the multi-channel PFC branch, avoiding overheating of a single component, reducing switching loss, and further improving the efficiency of the system;The IGBT switching tubes in each PFC branch work alternately with a certain phase difference, so that the current waveform of multiple inductances is staggered and overlapped, which can further reduce ripple current.

[0030] Further, the staggered arrangement of aluminum wire inductance and the working mode of multi-channel PFC branch helps to evenly distribute heat and prevent local overheating, which not only prolongs the service life of the components, but also simplifies the overall thermal management system.For single-channel PFC circuit, if aluminum wire inductance is used to reduce cost, the inductance volume will significantly increase, and the ripple current will still be large, and the power efficiency will still be low.By reasonably staggering the aluminum wire inductance in the multi-channel PFC branch, the power transmission is guaranteed to be efficient, while the inductance space is also reduced, which is conducive to realizing the miniaturization design of the frequency converter.It should be noted that in actual application, if the frequency converter has no high size requirement, the aluminum wire inductance in the multi-channel PFC branch can also be arranged side by side.In certain application scenarios, arranging aluminum wire inductance side by side also has its unique advantages, for example, arranging aluminum wire inductance side by side can simplify the wiring path and reduce the complexity of wiring, and the inductance components arranged side by side are also easier to automate and solder, and at the same time, arranging inductance components side by side makes it easier to contact and measure, facilitating debugging and maintenance work.Therefore, when selecting the inductance arrangement method, the specific design requirements and performance indicators can be considered comprehensively.

[0031] It can be understood that the multi-channel staggered structure provided by the utility model embodiment provides a natural redundancy mechanism, even if a branch fails, other branches can still work, ensuring the stability and reliability of the system.

[0032] In addition, the circuit design provided by the utility model embodiment can flexibly adjust the number and parameters of branches according to actual needs, and is suitable for different application scenarios from low power to high power, such as household air conditioner frequency converters and commercial air conditioner frequency converters.

[0033] In some of the embodiments, the circuit further comprises a bridge rectifier circuit and a direct current output capacitor; wherein the input end of the bridge rectifier circuit is connected with the alternating current power supply, the positive output end of the bridge rectifier circuit is connected with the aluminum wire inductance in the multi-path PFC branch respectively, and the negative output end of the bridge rectifier circuit is connected with the negative pole of the direct current voltage output end; one end of the direct current output capacitor is connected with the positive pole of the direct current voltage output end, and the other end is connected with the negative pole of the direct current voltage output end.

[0034] As shown in the figure, the circuit further comprises a bridge rectifier circuit and a direct current output capacitor. The alternating current power supply (AC) can be converted into pulsating direct current (DC) through the bridge rectifier circuit. Through the four diodes in the bridge rectifier circuit, full-wave rectification can be achieved, ensuring that the current input into the PFC branch is always unidirectional pulsating direct current, which not only improves the energy utilization rate, but also simplifies the design of the subsequent circuit. Figure 1 The direct current output capacitor is connected between the positive pole and the negative pole of the direct current voltage output end, used for filtering the pulsating component after rectification, providing a more smooth and stable direct current voltage output, which helps to maintain the stable operation of the load end, and the smooth direct current output also helps to reduce the working temperature of the IGBT switch tube and other elements, prolonging the service life. At the same time, when the alternating current power supply fluctuates or the load is transient, the direct current output capacitor can also store and release electric energy, thereby buffering voltage changes and maintaining the stability of the circuit.

[0035] On the other hand, through the joint action of the bridge rectifier circuit and the smoothing capacitor, the ripple current entering the PFC branch can be effectively reduced (at this time, smaller ripple current further reduces energy loss), making the working state of each aluminum wire inductance more stable, further reducing energy loss and improving overall efficiency.

[0036] According to a specific implementation mode of the embodiment of the utility model,

[0037] As shown in the figure, the circuit further comprises a bridge rectifier circuit and a direct current output capacitor. The alternating current power supply (AC) can be converted into pulsating direct current (DC) through the bridge rectifier circuit. Through the four diodes in the bridge rectifier circuit, full-wave rectification can be achieved, ensuring that the current input into the PFC branch is always unidirectional pulsating direct current, which not only improves the energy utilization rate, but also simplifies the design of the subsequent circuit. Figure 1 In the two-path PFC branch multi-path interleaved PFC circuit shown in the figure, in each branch, the aluminum wire inductance L1 and L2 are respectively connected with the corresponding diodes D1 and D2, and the corresponding IGBT Q1 and Q2 to form a PFC branch. The two PFC branches work alternately, and by controlling the switching state of the IGBT Q1 and Q2, the current waveforms of the two aluminum wire inductances are staggered, thereby reducing the ripple current; due to the staggered current waveforms of the two aluminum wire inductances, the ripple current is effectively offset, improving the power supply efficiency; and through the diodes D1 and D2, the output currents of the two PFC branches are rectified into direct current.

[0038] Figure 1 ​In the middle, alternating current power input (Vac): alternating current power input is converted into pulsating direct current through a bridge rectifier circuit (4 diodes); Bridge rectifier circuit: composed of four diodes, rectifies alternating current input voltage into pulsating direct current voltage; Aluminum wire inductance (L1 and L2): L1 (aluminum wire inductance): one end is connected to the positive output end (+) of the bridge rectifier, and the other end is connected to the anode of diode D1 and the collector of IGBT (Q1); L2 (aluminum wire inductance): one end is connected to the positive output end (+) of the bridge rectifier, and the other end is connected to the anode of diode D2 and the collector of IGBT (Q2); Diode (D1 and D2): D1, anode connected to the other end of L1, cathode connected to the positive electrode (V+) of the direct current output; D2, anode connected to the other end of L2, cathode connected to the positive electrode (V+) of the direct current output; IGBT (Q1, Q2): Q1, collector connected to the other end of L1, emitter connected to the negative electrode (V-) of the direct current output; Q2, collector connected to the other end of L2, emitter connected to the negative electrode (V-) of the direct current output; Direct current output capacitor (Cbus): the direct current output capacitor Cbus is connected between the positive electrode (V+) and the negative electrode (V-) of the direct current output, used for smoothing the output voltage.

[0039] In some embodiments, the circuit includes two PFC branches or three PFC branches.

[0040] Figure 1 A multi-path interleaved PFC circuit including two PFC branches is shown. Based on the size of the frequency converter, the multi-path interleaved PFC circuit provided by the embodiments of the present application can also include three PFC branches.

[0041] Through the design of two or three interleaved parallel connected PFC branches, the current waveforms of multiple inductors are interleaved and overlapped, so that the total ripple current is significantly reduced, thereby reducing energy loss and improving the overall conversion efficiency of the power supply. At the same time, multiple IGBT switching tubes in the multi-path PFC branch share the total current, avoiding overheating of a single component and reducing switching loss, further improving the efficiency of the system.

[0042] In some embodiments, the aluminum wire inductance satisfies: 25cm 3 / kw≤(L*W*H) / P≤50cm 3 / kw; wherein L, W, H are the inductance length, inductance width and inductance height of the aluminum wire inductance, respectively, in mm; P is the inductance power of the aluminum wire inductance, in kw.

[0043] As Figure 2 The schematic diagram of the aluminum wire inductance shows the inductance length L and the inductance height H of the aluminum wire inductance; Figure 3The schematic diagram of the aluminum wire inductor shows the inductance width W of the aluminum wire inductor and the cross-sectional area D of the aluminum wire of the aluminum wire inductor. The volume-to-power ratio set above ensures that the aluminum wire inductor in the multi-path interleaved PFC circuit has a high power density, that is, a higher power transmission capability is achieved in a limited space, and the compactness and efficiency of the overall system are improved. At the same time, the above-mentioned more reasonable volume-to-power ratio can help to reduce unnecessary material use, further reducing the circuit manufacturing cost; on the other hand, it also helps to reduce current fluctuation and high-frequency noise, thereby reducing the risk of electromagnetic interference. Within the above volume-to-power ratio range, the size design of the inductor also takes into account the effective dissipation of heat, that is, a larger surface-to-volume ratio is used to achieve better natural convection cooling, reducing the dependence on additional cooling devices.

[0044] In some embodiments, the aluminum wire inductor satisfies: 2.2A / mm 2 ≤I / D≤8.6A / mm 2 ; wherein I is the current flowing through the aluminum wire inductor, in A; D is the cross-sectional area of the aluminum wire of the aluminum wire inductor, in mm 2 .

[0045] The current density (the ratio of the current flowing through the aluminum wire inductor to the cross-sectional area of the aluminum wire, that is, the above I / D) set above ensures that the current density of the aluminum wire inductor is within a reasonable range, neither too low to cause material waste, nor too high to cause overheating or other reliability problems. By controlling the current density, the aluminum wire material can be maximized, unnecessary material consumption can be reduced, and production costs can be reduced while ensuring performance.

[0046] The above-mentioned appropriate current density helps to reduce thermal stress, prolong the service life of the inductor and other related elements, enhance the reliability and stability of the system, and also helps to reduce current fluctuation and high-frequency noise, thereby reducing the risk of electromagnetic interference.

[0047] In addition, in specific design, a lower current density (such as close to 2.2A / mm 2 ) can be selected to reduce resistance loss and improve inductor efficiency, thereby being more suitable for application scenarios that require long-term stable operation, such as air conditioner frequency converters. Selecting a higher current density (such as close to 8.6A / mm 2 ) allows the aluminum wire inductor to handle larger currents in a smaller volume, improving power handling capability, to be suitable for high-power application scenarios.

[0048] In some embodiments, the aluminum wire inductor is a base inductor and / or a baseless inductor; the shape of the aluminum wire inductor is circular and / or square; the winding shape of the aluminum wire inductor is circular and / or flat.

[0049] The type of the aluminum wire inductor can be designed according to specific requirements. If the inductor is applied to a vibration environment, a base inductor can be selected to provide additional support and enhance the overall mechanical strength of the inductor. Meanwhile, the base can rapidly conduct heat to an external heat dissipation device (such as a heat sink or a metal shell) due to good heat conductivity, thereby improving heat dissipation efficiency. If there is a higher requirement for the space size, a baseless aluminum wire inductor can be selected, which not only makes the inductor more portable and compact, but also reduces material usage and manufacturing cost.

[0050] Meanwhile, the inductor with a circular structure helps to form a more uniform magnetic field distribution, reduces magnetic flux leakage, and improves inductor performance. The manufacturing process of the circular inductor is relatively simple, and the cost is relatively low, which is suitable for mass production. The inductor with a square structure can better utilize limited space, and is particularly suitable for compact design and multi-layer circuit board layout. In addition, the square structure usually has more surface area, which is conducive to natural convection heat dissipation. The circular inductor winding is a common winding form, and the manufacturing process is mature. The cost is relatively low. In addition, the circular wire shows good electrical performance in high-frequency applications, reducing the influence of skin effect. The flat inductor winding can achieve a higher filling factor in the same volume, improving the power density of the inductor. In addition, the cross section of the flat wire is larger, reducing the DC resistance, reducing energy loss, and improving efficiency. Different shapes can be selected according to the advantages of different shapes and design requirements.

[0051] The above-mentioned multi-channel staggered PFC circuit provided by the embodiment of the utility model, because through adopt a kind of including the multi-channel staggered PFC circuit of PFC branch, any PFC branch in the current includes inductance, diode and IGBT switch tube;Wherein, inductance one end is connected with direct current voltage input terminal, other end is respectively connected with diode anode, IGBT switch tube collector;Diode cathode is connected with the positive pole of direct current voltage output terminal;IGBT switch tube emitter is connected with the negative pole of direct current voltage output terminal;Wherein, inductance is aluminum wire inductor, and the technical means that aluminum wire inductor in multi-channel PFC branch is staggered arrangement, overcome the problem of higher cost caused by copper wire inductor in related art when using multi-channel PFC circuit, realize providing a multi-channel staggered PFC circuit, and using aluminum wire inductor in circuit, thereby reduce the cost of circuit, multi-channel staggered operation can effectively reduce ripple current, reduce energy loss, and then improve the overall efficiency of power supply, and by aluminum wire inductor in multi-channel PFC branch staggered arrangement, reduce the space occupied by inductor, it is beneficial to realize the technical effect of frequency converter miniaturization design.

[0052] The embodiment of the utility model also provides a power factor correction device, including any one of the above-mentioned multi-channel staggered PFC circuit.

[0053] By adopting a multi-path staggered PFC circuit comprising a plurality of PFC branches connected in staggered parallel, each PFC branch in the current comprises an inductor, a diode and an IGBT switch tube; one end of the inductor is connected with a direct current voltage input end, the other end is connected with an anode of the diode and a collector of the IGBT switch tube respectively; a cathode of the diode is connected with a positive pole of a direct current voltage output end; an emitter of the IGBT switch tube is connected with a negative pole of the direct current voltage output end; the inductor is an aluminum inductor, and the aluminum inductors in the plurality of PFC branches are arranged staggered, which overcomes the problems of large ripple current, low power efficiency and complex thermal management in the related art by adopting only a single PFC circuit, and the problem of high cost caused by copper inductors in the related art by adopting a multi-path PFC circuit, thereby achieving the technical effects of providing a multi-path staggered PFC circuit, adopting aluminum inductors in the circuit to reduce the circuit cost, effectively reducing the ripple current and energy loss by multi-path staggered operation, thereby improving the overall efficiency of the power supply, and reducing the inductor space occupation by staggered arrangement of the aluminum inductors in the plurality of PFC branches, which is beneficial to the miniaturization design of the frequency converter.

[0054] The utility model embodiment further provides a kind of air conditioner frequency converter, comprising the multi-path staggered PFC circuit of any one described above.

[0055] In some embodiments, the power range of the air conditioner frequency converter is [1.5kw, 7.5kw], and the wire diameter of the aluminum inductor in the multi-path staggered PFC circuit ranges from 1mm to 3mm.

[0056] By setting the power range of the air conditioner frequency converter to [1.5kw, 7.5kw], the application scenarios from small household air conditioners to large commercial air conditioners are basically covered, which is suitable for the needs of various power levels. This design can flexibly adjust the number and parameters of branches according to actual needs to meet different application scenarios from low power to high power.

[0057] In some embodiments, the area S of the air conditioner frequency converter satisfies 150cm 2 ≤S≤600cm 2 , the contact area S1 of the aluminum inductor in the multi-path staggered PFC circuit and the electric control board satisfies 8cm 2 ≤S1≤60cm 2 , and the ratio of the contact area S1 to the area S of the air conditioner frequency converter satisfies 0.05≤S1 / S≤0.1.

[0058] By limiting the area range of the air conditioner frequency converter (150cm 2 to 600cm 2), ensuring that the device achieves efficient power transmission in a limited space, especially suitable for different installation environments of household and commercial air conditioners. The range of the contact area S1 (8cm 2 to 60cm 2 ) ensures good contact between the aluminum wire inductor and the control panel, enhancing mechanical stability, so as to maintain stability in the slight vibration scenario of air conditioner operation. At the same time, it does not occupy too much space, maintaining the compactness of the overall layout. The proportion of the contact area S1 to the total frequency converter area S is between 5% and 10%, ensuring sufficient heat dissipation path, and the larger contact area helps the heat to be quickly conducted to the control panel or other heat dissipation devices, preventing the inductor from overheating.

[0059] The above air conditioner frequency converter provided by the embodiment of the utility model,

[0060] Due to the above-mentioned multi-channel interleaved PFC circuit, the aluminum wire inductor is used in the circuit, thereby reducing the circuit cost, the multi-channel interleaved operation can effectively reduce the ripple current and energy loss, thereby improving the overall efficiency of the power supply, and the aluminum wire inductor in the multi-channel PFC branch is interleaved, reducing the inductor space, which is beneficial to realize the technical effect of miniaturization design of the air conditioner frequency converter.

[0061] It should be noted that the term "comprising" and its variants used in the embodiments of the utility model are open inclusion, that is, "including but not limited to". The term "based on" is "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modification of "one" and "multiple" mentioned in the embodiments of the utility model is illustrative rather than restrictive, and those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0062] The word "embodiment" in this specification means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the utility model. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean independence or choice from other embodiments. Each embodiment in the specification is described in a related manner, and the same and similar parts of each embodiment refer to each other. Especially for device, equipment, system embodiment, because it is basically similar to method embodiment, so the description is relatively simple, and the related parts refer to the part of the method embodiment.

[0063] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but cannot be understood as a limitation on the protection scope. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A multipath interleaved PFC circuit, characterized by, The PFC branch includes an inductor, a diode and an IGBT switch tube. The inductor is connected to a DC voltage input end at one end and to the anode of the diode and the collector of the IGBT switch tube at the other end, respectively. The inductor is an aluminum wire inductor, and the aluminum wire inductors in the multiple PFC branches are arranged in a staggered manner.

2. The circuit of claim 1, wherein, The circuit further includes a bridge rectifier circuit and a DC output capacitor.

3. The circuit according to claim 1, wherein The aluminum wire inductance satisfies: 25cm 3 / kw≤(L*W*H) / P≤50cm 3 / kw; wherein, L, W, H are inductance length, inductance width and inductance height of the aluminum wire inductance, respectively, with unit of mm; P is inductance power of the aluminum wire inductance, with unit of kw.

4. The circuit according to claim 1, wherein The aluminum wire inductance satisfies: 2.2A / mm 2 ≤I / D≤8.6A / mm 2 ; wherein I is the current flowing through the aluminum wire inductance, in A; D is the cross-sectional area of the aluminum wire of the aluminum wire inductance, in mm 2 .

5. The circuit according to claim 1, wherein The circuit includes two PFC branches or three PFC branches.

6. The circuit according to claim 1, wherein The aluminum wire inductor is a base inductor and / or a non-base inductor.

7. A power factor correction device, characterized by, The circuit includes the multiple staggered PFC branches according to any one of claims 1-6.

8. An air conditioner frequency inverter, characterized by comprising: The circuit includes the multiple staggered PFC branches according to any one of claims 1-6.

9. The air conditioner frequency converter according to claim 8, wherein The power range of the air conditioner frequency converter is [1.5kw, 7.5kw], and the wire diameter range of the aluminum wire inductor in the multiple staggered PFC branches is [1mm, 3mm].

10. The air conditioner frequency converter according to claim 8, wherein The area S of the air conditioner frequency converter satisfies: 150cm 2 ≤S≤600cm 2 The contact area S1 between the aluminum wire inductance and the electric control board in the multi-path interleaved PFC circuit satisfies: 8cm 2 ≤S1≤60cm 2 , and the ratio between the contact area S1 and the area S of the air conditioner frequency converter satisfies: 0.05≤S1 / S≤0.1.

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