Switching power supply for air conditioner and air conditioner

Abstract

The utility model discloses a switching power supply and air conditioner for air conditioner, switching power supply for air conditioner includes: power input piece, switching transformer includes primary winding, at least two secondary windings and common mode inductance spare, one of at least two secondary windings is main output winding, and the rest is non -main output winding. Therefore, by making the first side of common mode inductance spare have the positive and negative pole of feedback voltage, the second side of common mode inductance has the positive and negative pole of main output circuit, the both ends of main output winding are connected with the first side of common mode inductance spare, to be connected with the positive and negative pole of feedback voltage, one end of non -main output winding is connected with non -main output circuit positive pole, and the other end of non -main output winding is connected with the negative pole of main output circuit, like this not only can promote main output circuit and non -main output circuit output voltage's stability, solve switching power supply cross -regulation ratio higher's problem, can also reduce the power consumption of switching power supply, improve the electromagnetic compatibility characteristic of switching power supply.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a switching power supply for an air conditioner and an air conditioner. Background Technology

[0002] With the development of technology and the improvement of users' living standards, air conditioning technology is gradually moving towards intelligence. Most air conditioners use flyback switching power supplies to convert AC mains power into low-voltage DC power to power the air conditioner controller. However, as the functions of air conditioners continue to increase, the electrical load controlled by the air conditioner controller increases. In order to achieve stable power supply for multiple loads, the requirements for flyback switching power supplies are higher.

[0003] In related technologies, flyback multi-output switching power supplies typically use a main output voltage as the closed-loop control target of the feedback loop to achieve stable output of the main output voltage. However, other non-main output voltages are not controlled by the feedback loop. Therefore, the non-main output voltages fluctuate significantly due to the influence of the main output load and their own load, resulting in a high cross-regulation rate of the flyback multi-output switching power supply. In existing technologies, a linear regulator is usually used to achieve stable output of the non-main output voltage. However, the linear regulator has high power consumption, making it difficult and complex to achieve high-current regulated output of the non-main output circuit. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a switching power supply for air conditioners, which has a more reliable structure, can achieve regulated output of non-main output voltage without using a linear regulator, solves the problem of high cross-regulation of switching power supplies, and achieves regulated output of large current in non-main output circuits.

[0005] This utility model further proposes a method for use in air conditioners.

[0006] The present invention provides a switching power supply for an air conditioner, comprising: a power input component; a switching transformer, wherein the switching transformer includes a primary winding, the two ends of which are respectively connected to the positive and negative terminals of the power input component; the switching transformer further includes at least two secondary windings and a common-mode inductor, wherein one of the at least two secondary windings is designated as a main output winding, and the others as non-main output windings; a first side of the common-mode inductor is connected to the positive and negative terminals of a feedback voltage, and a second side of the common-mode inductor is connected to the positive and negative terminals of a main output circuit; the two ends of the main output winding are connected to the first side of the common-mode inductor to be connected to the positive and negative terminals of the feedback voltage; one end of each non-main output winding is connected to the positive terminal of a non-main output circuit, and the other end of the non-main output winding is connected to the negative terminal of the main output circuit.

[0007] The specific advantages or beneficial effects of the above scheme are as follows: By connecting the first side of the common-mode inductor to the positive and negative terminals of the feedback voltage, and the second side of the common-mode inductor to the positive and negative terminals of the main output circuit, the two ends of the main output winding are connected to the first side of the common-mode inductor to be connected to the positive and negative terminals of the feedback voltage, one end of the non-main output winding is connected to the positive terminal of the non-main output circuit, and the other end of the non-main output winding is connected to the negative terminal of the main output circuit. This not only improves the stability of the output voltage of the main output circuit and the non-main output circuit and solves the problem of high cross-regulation of the switching power supply, but also reduces the power consumption of the switching power supply and improves the electromagnetic compatibility characteristics of the switching power supply.

[0008] In some examples of this utility model, there are multiple non-main output windings, one end of each non-main output winding is connected to the positive terminal of the non-main output circuit, and the other end of each non-main output winding is connected to the negative terminal of the main output circuit.

[0009] The specific advantages or beneficial effects of the above scheme are as follows: By superimposing multiple non-main output windings between the positive terminal of the non-main output circuit and the negative terminal of the main output circuit, as well as on the second side of the common-mode inductor, the stability of each non-main output circuit can be improved without using a linear regulator, thereby enabling regulated output of multiple non-main output circuits and meeting the load requirements of multiple non-main output circuits.

[0010] In some examples of this utility model, there are multiple non-main output windings. A portion of the multiple non-main output windings is a first non-main output winding, and another portion is a second non-main output winding. One end of the first non-main output winding is connected to the positive terminal of the non-main output circuit, and the other end of the non-main output winding is connected to the negative terminal of the main output circuit. The second non-main output winding is independent of the main output winding, and its two ends are respectively connected to the positive terminal and the negative terminal of the non-main output circuit.

[0011] The specific advantages or beneficial effects of the above scheme are as follows: When a stable voltage is not required from the non-main output winding, the power supply requirements of the corresponding load can be met by setting the non-main output winding independently from the main output winding, and connecting the two ends of the second non-main output winding to the positive and negative terminals of the non-main output circuit respectively. In this way, different load requirements can be met by different designs of the first and second non-main output windings, which can increase the functionality of the switching power supply and optimize the circuit design of the switching power supply.

[0012] In some examples of this utility model, a first rectifier diode is provided on the main output winding; and / or a second rectifier diode is provided on the non-main output winding.

[0013] The specific advantages or beneficial effects of the above scheme are as follows: By setting a first rectifier diode on the main output winding and / or setting a second rectifier diode on the non-main output winding, the AC voltage across the main output winding and / or the non-main output winding can be rectified by the diode and converted into DC voltage before being output, thereby meeting the power supply requirements of the load in the circuit where the main output winding and / or the non-main output winding are located.

[0014] In some examples of this utility model, the two ends of the main output winding are respectively provided with a positive power supply terminal and a power supply ground terminal, a first capacitor is connected between the positive power supply terminal and the power supply ground terminal, the positive power supply terminal and the power supply ground terminal are respectively connected to the positive and negative terminals of the main output circuit, the other end of the non-main output winding is connected to the positive power supply terminal, and / or a second capacitor is connected between the two ends of the non-main output winding.

[0015] The specific advantages or beneficial effects of the above scheme are as follows: By setting the first capacitor and / or the second capacitor, the capacitors can filter the output voltage across the main output winding and / or the non-main output winding, thereby making the output voltage across the main output winding and / or the non-main output winding smoother and further improving the stability of the output voltage across the main output winding and / or the non-main output winding. By connecting the positive terminal of the power supply and the power supply ground to the positive and negative terminals of the main output circuit respectively, and connecting the other end of the non-main output winding to the positive terminal of the power supply, the positive terminal of the power supply and the power supply ground can both be set on the second side of the common-mode inductor, thereby improving the stability of the main output circuit and the non-main output circuit through the common-mode inductor.

[0016] In some examples of this utility model, the switching power supply for an air conditioner further includes a linear regulator, which is disposed between the positive terminal of the main output winding and the positive terminal of the main output circuit and connected to the power supply ground.

[0017] The specific advantages or beneficial effects of the above scheme are as follows: By placing the linear regulator between the positive terminal of the main output winding and the positive terminal of the main output circuit and connecting it to the power supply ground, not only can the output voltage of the main output circuit be further converted to meet the load requirements of the main output circuit, but the accuracy and stability of the output voltage of the main output circuit can also be further improved.

[0018] In some examples of this utility model, the switching power supply for an air conditioner further includes a switching power supply chip and an auxiliary winding. The switching power supply chip is connected in series between the primary winding and the power input device, and the auxiliary winding is connected to the switching power supply chip to supply power to the switching power supply chip.

[0019] The specific advantages or beneficial effects of the above scheme are as follows: By connecting the switching power supply chip in series between the primary winding and the power input device, the current flowing to the primary winding can be regulated by the switching power supply chip, thereby realizing the regulation of the input voltage and output voltage of the switching transformer.

[0020] In some examples of this utility model, the switching power supply for an air conditioner further includes a third capacitor, the two ends of which are respectively connected to the positive and negative terminals of the power input device and are arranged in parallel with the primary winding.

[0021] The specific advantages or beneficial effects of the above scheme are as follows: By setting a third capacitor to play a filtering role, the output voltage between the positive and negative terminals of the power input device can be smoother, which can further improve the stability of the output voltage between the positive and negative terminals of the power input device, so that the power input device can provide a stable and reliable voltage to the primary winding.

[0022] In some examples of this utility model, the power input device is an AC power input device, and a third rectifier diode is provided on both the positive and negative terminals of the AC power input device. The third rectifier diode is connected in series with the third capacitor and in series with the primary winding; and / or the power input device is a DC power input device.

[0023] The specific advantages or beneficial effects of the above scheme are as follows: a stable and reliable DC current is provided to the input circuit of the switching power supply through AC power input components and / or DC power input components to ensure the normal operation of the switching power supply.

[0024] An air conditioner according to an embodiment of the present invention includes: the switching power supply for an air conditioner described above.

[0025] The specific advantages or beneficial effects of the above scheme are as follows: By adding a common-mode inductor, not only can the non-main output voltage be regulated without using a linear regulator, solving the problem of high cross-regulation of the switching power supply, but also the power consumption of the non-main output circuit can be reduced, the high current regulated output of the non-main output circuit can be achieved, and the electromagnetic interference characteristics of the switching power supply can be improved, thus optimizing the circuit performance of the switching power supply.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1This is a schematic diagram of a switching power supply according to the first embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of a switching power supply according to a second embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of a switching power supply according to a third embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of a switching power supply according to the fourth embodiment of the present invention.

[0032] Figure label:

[0033] 100. Switching power supply;

[0034] 10. Power input device; 101. AC power input device; 102. DC power input device;

[0035] 20. Switching transformer; 201. Primary winding; 202. Secondary winding; 2021. Main output winding; 2022. Non-main output winding; 2023. Power supply positive terminal; 2024. Power supply ground; 203. Common mode inductor;

[0036] 30. Main output circuit; 40. Non-main output circuit; 50. Feedback circuit;

[0037] 601, First rectifier diode; 602, Second rectifier diode; 603, Third rectifier diode;

[0038] 701. First capacitor; 702. Second capacitor; 703. Third capacitor;

[0039] 801, Linear regulator; 802, Switching power supply chip; 803, Auxiliary winding. Detailed Implementation

[0040] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0041] The following is for reference. Figures 1-4 This invention describes a switching power supply 100 for an air conditioner according to an embodiment of the present invention. The switching power supply 100 can be applied to an air conditioner. It should be noted that... Figures 1-4 In this diagram, VO+ and VO- represent the positive and negative terminals of the feedback voltage, respectively; VO1+ and VO1- represent the positive and negative terminals of the main output circuit 30, respectively; and VO2+ represents the positive terminal of the non-main output circuit 40.

[0042] Combination Figures 1-4As shown, the switching power supply 100 for an air conditioner according to this utility model mainly includes: a power input component 10 and a switching transformer 20. The switching transformer 20 includes a primary winding 201, with its two ends connected to the positive and negative terminals of the power input component 10, respectively. This allows the power input component 10 to supply power to the primary winding 201 of the switching transformer 20, thereby generating a changing magnetic field around the primary winding 201.

[0043] Furthermore, the switching transformer 20 also includes at least two secondary windings 202. Due to the principle of electromagnetic induction, the magnetic field generated by the primary winding 201 passes through the secondary winding 202, thereby inducing an electromotive force in the secondary winding 202, which in turn generates voltage and current in the closed loop containing the secondary winding 202. Additionally, the voltage and current generated in the closed loop containing the secondary winding 202 can be adjusted according to the turns ratio of the primary winding 201 and the secondary winding 202 to meet the power supply requirements of the load in the closed loop containing the secondary winding 202.

[0044] Furthermore, at least one of the two secondary windings 202 is designated as the main output winding 2021, and the others as non-main output windings 2022. Different output voltages can be provided by the main output winding 2021 and the non-main output windings 2022 to meet the power supply requirements of different loads.

[0045] Furthermore, the switching transformer 20 also includes a common-mode inductor 203. The first side of the common-mode inductor 203 is connected to the positive and negative terminals of the feedback voltage, and the second side is connected to the positive and negative terminals of the main output circuit 30. Specifically, by placing the common-mode inductor 203 between the positive and negative terminals of the feedback voltage and the main output voltage, the electromagnetic interference experienced by the main output circuit 30 can be reduced, the electromagnetic compatibility characteristics of the main output circuit 30 can be improved, and the stability of the main output voltage can be enhanced.

[0046] Furthermore, the two ends of the main output winding 2021 are connected to the first side of the common-mode inductor 203 to be connected to the positive and negative terminals of the feedback voltage. A feedback circuit 50 is also provided between the positive and negative terminals of the feedback voltage. In this way, the output voltage at both ends of the main output winding 2021 can be fed back in real time through the feedback circuit 50 connected to the positive and negative terminals of the feedback voltage. Based on the feedback voltage at both ends of the main output winding 2021, the input voltage of the power input device 10 or the number of turns of the primary winding 201 and the secondary winding 202 can be adjusted, thereby improving the accuracy and stability of the output voltage at both ends of the main output winding 2021. This not only further improves the stability of the main output voltage, but also enhances the safety of the switching power supply 100, ensuring that the output voltage at both ends of the main output winding 2021 is maintained within a safe range, thereby reducing the occurrence of circuit failures in the switching power supply 100.

[0047] Furthermore, one end of the non-main output winding 2022 is connected to the positive terminal of the non-main output circuit 40, and the other end of the non-main output winding 2022 is connected to the negative terminal of the main output circuit 30. Since the two ends of the main output winding 2021 are connected to the positive and negative terminals of the feedback voltage, and the common-mode inductor 203 is positioned between the positive and negative terminals of the feedback voltage and the positive and negative terminals of the main output voltage, it can be deduced that the common-mode inductor 203 is positioned between the main output winding 2021 and the positive and negative terminals of the main output voltage. Therefore, the common-mode inductor 203 is also located between the main output winding 2021 and the non-main output winding 2022. This can reduce the influence of the load in the main output circuit 30 and the load in its own circuit on the non-main output voltage, reduce the electromagnetic interference on the main output circuit 30 and the non-main output circuit 40, improve the electromagnetic compatibility characteristics of the main output circuit 30 and the non-main output circuit 40, thereby improving the stability of the output voltage of the main output circuit 30 and the non-main output circuit 40 without using the linear regulator 801, solving the problem of high cross-regulation of the switching power supply 100, and also reducing the power consumption of the non-main output circuit 40, achieving high current regulated output of the non-main output circuit 40.

[0048] Therefore, by connecting the first side of the common-mode inductor 203 to the positive and negative terminals of the feedback voltage, connecting the second side of the common-mode inductor to the positive and negative terminals of the main output circuit 30, connecting both ends of the main output winding 2021 to the first side of the common-mode inductor 203 to be connected to the positive and negative terminals of the feedback voltage, connecting one end of the non-main output winding 2022 to the positive terminal of the non-main output circuit 40, and connecting the other end of the non-main output winding 2022 to the negative terminal of the main output circuit 30, the stability of the output voltage of the main output circuit 30 and the non-main output circuit 40 can be improved, solving the problem of high cross-regulation of the switching power supply 100, reducing the power consumption of the switching power supply 100, and improving the electromagnetic compatibility characteristics of the switching power supply 100.

[0049] Combination Figure 3 As shown, there are multiple non-main output windings 2022. One end of each non-main output winding 2022 is connected to the positive terminal of the non-main output circuit 40, and the other end of each non-main output winding 2022 is connected to the negative terminal of the main output circuit 30. Specifically, by setting multiple non-main output windings 2022 and connecting the two ends of each non-main output winding 2022 to the positive terminal of the non-main output circuit 40 and the negative terminal of the main output circuit 30 respectively, the multiple non-main output windings 2022 are superimposed on the second side of the common-mode inductor. This improves the stability of each non-main output circuit 40 without using a linear regulator 801, thereby achieving regulated output from multiple non-main output circuits 40 and meeting the load requirements of the multiple non-main output circuits 40.

[0050] Combination Figure 4As shown, there are multiple non-main output windings 2022. One part of the multiple non-main output windings 2022 is the first non-main output winding 2022, and the other part is the second non-main output winding 2022. One end of the first non-main output winding 2022 is connected to the positive terminal of the non-main output circuit 40, and the other end of the non-main output winding 2022 is connected to the negative terminal of the main output circuit 30. The second non-main output winding 2022 is independent of the main output winding 2021, and its two ends are respectively connected to the positive terminal of the non-main output circuit 40 and the negative terminal of the non-main output circuit 40.

[0051] Specifically, the two ends of the first non-main output winding 2022 are connected to the positive terminal of the corresponding non-main output circuit 40 and the negative terminal of the main output circuit 30, respectively, so that the circuit containing the first non-main output winding 2022 can output a stable voltage to meet the load requirements of the circuit containing the first non-main output winding 2022; the second non-main output winding 2022 is independent of the main output winding 2021, that is, the second non-main output winding 2022 and the main output winding 2021 are not connected, and the two ends of the second non-main output winding 2022 are connected to the positive terminal of the corresponding non-main output circuit 40 and the negative terminal of the corresponding non-main output circuit 40, respectively. In this way, the circuit containing the second non-main output winding 2022 will output an unstable or poorly stable voltage to meet the load requirements of the circuit containing the first non-main output winding 2022. This configuration allows for the fulfillment of load requirements when a stable voltage is not needed from the non-main output winding 2022. By setting the non-main output winding 2022 independently from the main output winding 2021, and connecting the two ends of the second non-main output winding 2022 to the positive and negative terminals of the corresponding non-main output circuit 40 respectively, the load requirements corresponding to the second non-main output winding 2022 can be met. In this way, different load requirements can be met by using different designs for the first and second non-main output windings 2022, which can increase the functionality of the switching power supply 100, improve its performance, and optimize its circuit design.

[0052] Combination Figures 1-4 As shown, a first rectifier diode 601 is provided on the main output winding 2021; and / or a second rectifier diode 602 is provided on the non-main output winding 2022.

[0053] Specifically, the voltage generated across the main output winding 2021 due to electromagnetic induction is an AC voltage. The first rectifier diode 601 has unidirectional conductivity. By setting the first rectifier diode 601 on the main output winding 2021, the AC voltage across the main output winding 2021 can be rectified by the first rectifier diode 601 and converted into a DC voltage before being output. This can meet the power supply requirements of the load in the circuit where the main output winding 2021 is located and ensure the normal operation of the switching power supply 100.

[0054] Furthermore, the voltage generated across the non-main output winding 2022 due to electromagnetic induction is also an AC voltage. The second rectifier diode 602 also has unidirectional conductivity. By setting the second rectifier diode 602 on the non-main output winding 2022, the AC voltage across the non-main output winding 2022 can be rectified by the second rectifier diode 602 and converted into a DC voltage before being output. This can meet the power supply requirements of the load in the circuit where the non-main output winding 2022 is located and ensure the normal operation of the switching power supply 100.

[0055] Combination Figures 1-4 As shown, the two ends of the main output winding 2021 are respectively provided with a positive power supply 2023 and a power supply ground 2024. A first capacitor 701 is connected between the positive power supply 2023 and the power supply ground 2024. The positive power supply 2023 and the power supply ground 2024 are respectively connected to the positive and negative terminals of the main output circuit 30. The other end of the non-main output winding 2022 is connected to the positive power supply 2023; and / or a second capacitor 702 is connected between the two ends of the non-main output winding 2022.

[0056] Specifically, by connecting a first capacitor 701 between the positive power supply 2023 and the ground power supply 2024, the first capacitor 701 can act as a filter, thereby reducing the fluctuation of the output voltage between the positive power supply 2023 and the ground power supply 2024, making the output voltage between the positive power supply 2023 and the ground power supply 2024 smoother, and further improving the stability of the output voltage between the positive power supply 2023 and the ground power supply 2024.

[0057] Furthermore, the positive power supply 2023 and the ground power supply 2024 are connected to the positive and negative terminals of the main output circuit 30, respectively, and the other end of the non-main output winding 2022 is connected to the positive power supply 2023. This not only ensures the rationality of the circuit setting of the switching power supply 100 and the normal operation of the switching power supply 100, but also, since the positive power supply 2023 and the ground power supply 2024 are both located on the second side of the common-mode inductor 203, the stability of the main output circuit 30 and the non-main output circuit 40 can be improved through the common-mode inductor 203. This can reduce the electromagnetic interference experienced by the main output circuit 30 and the non-main output circuit 40, improve the electromagnetic compatibility characteristics of the main output circuit 30 and the non-main output circuit 40, thereby improving the stability of the output voltage of the main output circuit 30 and the non-main output circuit 40 without using the linear regulator 801, solving the problem of high cross-regulation of the switching power supply 100, and also reducing the power consumption of the non-main output circuit 40, achieving high-current regulated output of the non-main output circuit 40.

[0058] Furthermore, by connecting a second capacitor 702 between the two ends of the non-main output winding 2022, the second capacitor 702 can act as a filter, thereby reducing the fluctuation of the output voltage between the two ends of the non-main output winding 2022, making the output voltage between the two ends of the non-main output winding 2022 smoother, and further improving the stability of the output voltage between the two ends of the non-main output winding 2022.

[0059] In addition, a capacitor is also connected between the two ends of the main output winding 2021. Through the filtering effect of the capacitor, the fluctuation of the output voltage between the two ends of the main output winding 2021 can be reduced, making the output voltage between the two ends of the main output winding 2021 smoother and further improving the stability of the output voltage between the two ends of the main output winding 2021.

[0060] Combination Figures 1-4 As shown, the switching power supply 100 for the air conditioner also includes a linear regulator 801. The linear regulator 801 is disposed between the positive terminal of the main output winding 2021 and the positive terminal of the main output circuit 30 and connected to the power ground 2024. Specifically, by distributing the linear regulator 801 between the positive terminal of the main output winding 2021 and the positive terminal of the main output circuit 30 and connecting it to the power ground 2024, not only can the output voltage of the main output circuit 30 be further converted to meet the load requirements of the main output circuit 30, but the accuracy and stability of the output voltage of the main output circuit 30 can also be further improved.

[0061] Combination Figures 1-4As shown, the switching power supply 100 for the air conditioner also includes a switching power supply chip 802 and an auxiliary winding 803. The switching power supply chip 802 is connected in series between the primary winding 201 and the power input device 10. The auxiliary winding 803 is connected to the switching power supply chip 802 to supply power to the switching power supply chip 802.

[0062] Specifically, by connecting the switching power supply chip 802 in series between the primary winding 201 and the power input device 10, not only can the current flowing to the primary winding 201 be regulated by the switching power supply chip 802, thereby achieving overall regulation of the input and output voltages of the switching transformer 20, but it can also help reduce the overall size of the switching power supply 100, improve the space utilization of the switching power supply 100, improve the working efficiency of the switching power supply 100, and improve the safety of the switching power supply 100.

[0063] Furthermore, the auxiliary winding 803 is an independent winding. After rectification and filtering, the output terminal of the auxiliary winding 803 is connected to the corresponding pin of the switching power supply chip 802 to supply power to the switching power supply chip 802. This ensures the normal operation of the switching power supply chip 802.

[0064] Combination Figures 1-4 As shown, the switching power supply 100 for an air conditioner also includes a third capacitor 703. The two ends of the third capacitor 703 are connected to the positive and negative terminals of the power input unit 10, respectively, and are connected in parallel with the primary winding 201. Specifically, by connecting the two ends of the third capacitor 703 to the positive and negative terminals of the power input unit 10, respectively, and connecting it in parallel with the primary winding 201, the third capacitor 703 can act as a filter, thereby reducing the fluctuation of the output voltage between the positive and negative terminals of the power input unit 10, making the output voltage between the positive and negative terminals of the power input unit 10 smoother, and further improving the stability of the output voltage between the positive and negative terminals of the power input unit 10, so that the power input unit 10 can provide a stable and reliable voltage to the primary winding 201.

[0065] Combination Figures 1-4 As shown, the power input device 10 is an AC power input device 101, and a third rectifier diode 603 is provided on both the positive and negative terminals of the AC power input device 101. The third rectifier diode 603 is connected in series with the third capacitor 703 and in series with the primary winding 201; and / or the power input device 10 is a DC power input device 102.

[0066] Specifically, the power input device 10 can be an AC power input device 101 or a DC power input device 102. When the power input device 10 is an AC power input device 101, the AC voltage output by the AC power input device 101 needs to be rectified by the third rectifier diode 603 and filtered by the third capacitor 703 to convert the AC voltage output by the AC power input device 101 into a stable and smooth DC voltage before it is output. In this way, the AC power input device 101 and / or the DC power input device 102 can provide a stable and reliable DC current to the input circuit of the switching power supply 100 to ensure the normal operation of the switching power supply 100.

[0067] In addition, there are multiple third rectifier diodes 603. The AC signal output from the AC power input device 101 is rectified by the combined action of multiple third rectifier diodes 603, so as to convert the AC voltage output from the AC power input device 101 into a stable and smooth DC voltage.

[0068] The air conditioner according to this utility model mainly includes: the aforementioned switching power supply 100 for air conditioners. Specifically, since the switching power supply 100 for air conditioners has a more reliable structure and good working performance, applying the switching power supply 100 to an air conditioner, by adding a common-mode inductor 203 to the switching power supply 100, not only can the regulated output of the non-main output circuit 40 be achieved without using a linear regulator 801, solving the problem of the high cross-regulation rate of the switching power supply 100, but also the power consumption of the non-main output circuit 40 can be reduced, achieving regulated output of the large current of the non-main output circuit 40. At the same time, the electromagnetic interference characteristics of the switching power supply 100 can be improved, and the circuit performance of the switching power supply 100 can be optimized.

[0069] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0071] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A switching power supply for an air conditioner, characterized in that, include: Power input device; A switching transformer, comprising a primary winding, the two ends of which are respectively connected to the positive and negative terminals of the power input device; The switching transformer further includes at least two secondary windings and a common-mode inductor. One of the at least two secondary windings is designated as the main output winding, and the others are designated as non-main output windings. The first side of the common-mode inductor is connected to the positive and negative terminals of the feedback voltage, and the second side of the common-mode inductor is connected to the positive and negative terminals of the main output circuit. The two ends of the main output winding are connected to the first side of the common-mode inductor to be connected to the positive and negative terminals of the feedback voltage. One end of the non-main output winding is connected to the positive terminal of the non-main output circuit, and the other end of the non-main output winding is connected to the negative terminal of the main output circuit.

2. The switching power supply for an air conditioner according to claim 1, characterized in that, There are multiple non-main output windings, one end of each non-main output winding is connected to the positive terminal of the non-main output circuit, and the other end of each non-main output winding is connected to the negative terminal of the main output circuit.

3. The switching power supply for an air conditioner according to claim 1, characterized in that, There are multiple non-main output windings. A portion of the multiple non-main output windings is a first non-main output winding, and another portion is a second non-main output winding. One end of the first non-main output winding is connected to the positive terminal of the non-main output circuit, and the other end of the non-main output winding is connected to the negative terminal of the main output circuit. The second non-main output winding is independent of the main output winding and its two ends are respectively connected to the positive terminal of the non-main output circuit and the negative terminal of the non-main output circuit.

4. The switching power supply for an air conditioner according to claim 1, characterized in that, A first rectifier diode is provided on the main output winding; and / or A second rectifier diode is provided on the non-main output winding.

5. The switching power supply for an air conditioner according to claim 1, characterized in that, The main output winding has a positive power supply terminal and a ground power supply terminal at its two ends, respectively. A first capacitor is connected between the positive power supply terminal and the ground power supply terminal. The positive power supply terminal and the ground power supply terminal are respectively connected to the positive and negative terminals of the main output circuit. The other end of the non-main output winding is connected to the positive power supply terminal; and / or A second capacitor is connected between the two ends of the non-main output winding.

6. The switching power supply for an air conditioner according to claim 5, characterized in that, It also includes a linear regulator, which is disposed between the positive terminal of the main output winding and the positive terminal of the main output circuit and connected to the power supply ground.

7. The switching power supply for an air conditioner according to claim 1, characterized in that, It also includes a switching power supply chip and an auxiliary winding. The switching power supply chip is connected in series between the primary winding and the power input device, and the auxiliary winding is connected to the switching power supply chip to supply power to the switching power supply chip.

8. The switching power supply for an air conditioner according to claim 1, characterized in that, It also includes a third capacitor, the two ends of which are respectively connected to the positive and negative terminals of the power input device and are arranged in parallel with the primary winding.

9. The switching power supply for an air conditioner according to claim 8, characterized in that, The power input device is an AC power input device, and a third rectifier diode is provided at both the positive and negative terminals of the AC power input device. The third rectifier diode is connected in series with the third capacitor and in series with the primary winding; and / or The power input device is a DC power input device.

10. An air conditioner, characterized in that, The power supply for an air conditioner includes any one of claims 1-9.

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