Driving device and air energy hot water system

Abstract

The utility model belongs to the technical field of electric appliances, and particularly relates to a driving device and an air energy hot water system. The driving device comprises a bridgeless PFC circuit, a fan driving circuit, a compressor driving circuit, a fan and a compressor; the alternating current side of the bridgeless PFC circuit is connected with an alternating current access end and is used for receiving alternating current, the direct current side of the bridgeless PFC circuit is connected with the power supply end of the fan driving circuit, and the direct current side of the bridgeless PFC circuit is connected with the power supply end of the compressor driving circuit; the output end of the fan driving circuit is used for connecting the electrical end of a fan, and the output end of the compressor driving circuit is used for connecting the electrical end of a compressor; according to the structure, the on-state loss in the electric energy conversion process is reduced, the electric energy utilization rate is improved, harmonic pollution is reduced, and stable operation of a power grid is facilitated.

Description

Technical Field

[0001] The present application belongs to the field of electrical appliance technology, and specifically relates to a driving device and an air-energy water heating system. Background Art

[0002] As the global energy crisis and environmental issues become increasingly severe, people are seeking more efficient and environmentally friendly ways to utilize energy. Air-to-water hot water systems absorb and utilize heat energy from the air to heat water, reducing reliance on traditional energy sources and lowering greenhouse gas emissions. This technology, based on thermodynamic principles and the refrigeration cycle, converts low-grade heat energy in the air into high-grade heat energy through the coordinated operation of components such as the evaporator, compressor, and condenser, thereby providing hot water. The emergence of air-to-water hot water systems not only meets people's pursuit of a comfortable life but also aligns with global trends in sustainable development, thus garnering widespread attention and application.

[0003] Conventional air-to-water heating systems consist of a bridge PFC circuit (a rectifier bridge and a power factor correction control unit), a fan, and a compressor. The rectifier bridge, consisting of four diodes, converts AC power into DC power. The power factor correction (PFC) control unit controls the current waveform to make it close to a sine wave and maintain phase with the input grid voltage.

[0004] However, the air-to-water heating system uses a bridge PFC circuit, which uses a rectifier bridge. When the rectifier bridge converts AC power to DC power, it generates a certain forward voltage drop and reverse recovery loss. These losses are dissipated as heat, thereby reducing the energy conversion efficiency of the air-to-water heating system. Therefore, in actual operation, this air-to-water heating system faces relatively high conduction losses, which in turn leads to a decrease in its energy efficiency ratio, affecting the overall performance and energy saving effect of the system. Utility Model Content

[0005] The present application provides a driving device and an air-energy water heating system, which solves the problem of relatively high conduction loss faced by the air-energy water heating system in actual operation.

[0006] In a first aspect, the present application provides a driving device, the driving device comprising: a bridgeless PFC circuit, a fan driving circuit, and a compressor driving circuit;

[0007] The AC side of the bridgeless PFC circuit is connected to the AC access terminal for receiving AC power, the DC side of the bridgeless PFC circuit is connected to the power supply terminal of the fan drive circuit, and the DC side of the bridgeless PFC circuit is connected to the power supply terminal of the compressor drive circuit;

[0008] The output end of the fan drive circuit is used to connect to the electrical end of the fan, and the output end of the compressor drive circuit is used to connect to the electrical end of the compressor.

[0009] Optionally, the bridgeless PFC circuit includes a first power correction branch and a second power correction branch;

[0010] The input end of the first power correction branch and the input end of the second power correction branch each include two input terminals;

[0011] One input terminal of the first power correction branch is connected to an AC access terminal, the input end of the second power correction branch is connected to another AC access terminal, and the other input terminal of the first power correction branch is connected to the other input terminal of the second power correction branch;

[0012] The output end of the first power correction branch and the output end of the second power correction branch are connected in parallel.

[0013] Optionally, the first power correction branch includes a first diode, a second diode, a first inductor and a first switch tube;

[0014] The cathode of the first diode is an input terminal of the first power correction branch, and the anode of the first diode is another input terminal of the first power correction branch; the cathode of the first diode is connected to the anode of the second diode through the first inductor, and the cathode of the second diode is an output terminal of the first power correction branch; the cathode of the first diode is also connected to the first end of the first switching tube through the first inductor, and the second end of the first switching tube is connected to the cathode of the first diode, and the second end of the first switching tube is another output terminal of the first power correction branch.

[0015] Optionally, the second power correction branch includes a third diode, a fourth diode, a second inductor and a second switch tube;

[0016] The cathode of the third diode is an input terminal of the second power correction branch, and the anode of the third diode is another input terminal of the second power correction branch; the cathode of the third diode is connected to the anode of the fourth diode through the second inductor, and the cathode of the fourth diode is an output terminal of the second power correction branch; the cathode of the third diode is also connected to the first end of the second switching tube through the second inductor, and the second end of the second switching tube is connected to the cathode of the third diode, and the second end of the second switching tube is another output terminal of the second power correction branch.

[0017] Optionally, the driving device further includes a noise suppression circuit, and the bridgeless PFC circuit is connected to the AC access end via the noise suppression circuit.

[0018] Optionally, the noise suppression circuit includes a common-mode inductor, an input end of the common-mode inductor is connected to the AC access end, and an output end of the common-mode inductor is connected to an input end of the bridgeless PFC circuit.

[0019] Optionally, the noise suppression circuit includes a first noise capacitor and a second noise capacitor; the first noise capacitor is connected in parallel to the input end of the common-mode inductor, and the second noise capacitor is connected in parallel to the output end of the common-mode inductor.

[0020] Optionally, the noise suppression circuit includes a third noise capacitor and a fourth noise capacitor, wherein the first end of the third noise capacitor is connected to one output terminal of the common-mode inductor, and the second end of the third noise capacitor is grounded; the first end of the fourth noise capacitor is grounded, and the second end of the fourth noise capacitor is connected to the other output terminal of the common-mode inductor.

[0021] Optionally, the bridgeless PFC circuit further includes an absorption capacitor and a film capacitor;

[0022] The absorption capacitor and the film capacitor are both connected in parallel to the output end of the first power correction branch.

[0023] In a second aspect, the present application provides an air energy heat pump system, comprising: a drive device, a fan and a compressor; the DC side of the drive device is connected to the electrical end of the fan, and the DC side of the drive device is also connected to the electrical end of the compressor.

[0024] The present application provides a drive device and an air-energy water heating system, comprising: a bridgeless PFC circuit, a fan drive circuit, a compressor drive circuit, a fan, and a compressor; the AC side of the bridgeless PFC circuit is connected to the AC access terminal for receiving AC power, the DC side of the bridgeless PFC circuit is connected to the power supply terminal of the fan drive circuit, and the DC side of the bridgeless PFC circuit is connected to the power supply terminal of the compressor drive circuit; the output terminal of the fan drive circuit is used to connect to the electrical terminal of the fan, and the output terminal of the compressor drive circuit is used to connect to the electrical terminal of the compressor; this structure reduces the conduction loss in the power conversion process, improves the power utilization rate, and reduces harmonic pollution, which is conducive to the stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] Figure 1 This is a schematic structural diagram of a driving device of the present application;

[0027] Figure 2 A schematic diagram of a bridgeless PFC circuit topology in a driving device of the present application;

[0028] Figure 3 This is a schematic structural diagram of an air-to-water heating system for this application.

[0029] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

[0030] Figure numerals: A, drive device; 1, bridgeless PFC circuit; 2, fan drive circuit; 3, compressor drive circuit; 4, AC access terminal; 5, first DSP controller; 6, second DSP controller; 7, fan; 8, compressor; 11, first power correction branch; 12, second power correction branch; 13, noise suppression circuit; 101, first noise capacitor; 102, common-mode inductor; 103, second noise capacitor; 104, discharge resistor; 105, third noise capacitor; 106, fourth noise capacitor; 107, first inductor; 108, second inductor; 109, second diode; 110, fourth diode; 111, first diode; 112, third diode; 113, first switch tube; 114, second switch tube; 115, absorption capacitor; 116, film capacitor. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] The terms "first," "second," "third," "fourth," and so on (if any) in the description and claims of the present invention and the drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that the terms used in this manner can be interchanged where appropriate, so that the embodiments of the present invention described herein can, for example, be implemented in an order other than those illustrated or described herein.

[0033] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0034] Existing air-to-water water heating systems include a bridge PFC circuit (consisting of a rectifier bridge and a power factor correction (PFC) control unit), a fan, and a compressor. The rectifier bridge, comprised of four arranged diodes, safely and efficiently converts incoming AC power into DC. The PFC control unit controls the current waveform to approximate an ideal sine wave and maintains phase with the grid voltage, effectively improving the system's power factor, reducing harmonic pollution, and achieving efficient energy utilization.

[0035] However, although air-to-water heating systems use a bridge PFC circuit to improve energy efficiency, the bridge rectifier generates forward voltage drop and reverse recovery losses when converting AC power to DC. These losses are not only dissipated as heat but also reduce the energy conversion efficiency of the entire system. As a result, this air-to-water heating system faces relatively high conduction losses in actual operation, which in turn reduces its energy efficiency ratio, affecting the overall system performance and energy saving effect.

[0036] In response to the above problems, the present application provides a drive device and an air-to-water heating system, wherein the core of the drive device A is a bridgeless PFC circuit 1. The bridgeless PFC circuit 1 efficiently receives and converts electrical energy from the AC access terminal 4 through a unique dual-power correction branch design. It is also equipped with a fan drive circuit 2 and a compressor drive circuit 3, which respectively provide stable DC power to the fan 7 and compressor 8 in the air-to-water heating system. The noise suppression circuit 13 in the bridgeless PFC circuit 1 uses multiple noise capacitors and common-mode inductors 102 to effectively filter out electromagnetic interference from the AC access terminal 4, ensuring the stable operation of the circuit. In addition, the parallel configuration of the absorption capacitor 115 and the thin-film capacitor 116 further enhances the anti-interference ability and output stability of the circuit. The entire drive device A improves the energy efficiency and reliability of the air-to-water heating system and ensures the efficient coordination of the fan 7 and the compressor 8.

[0037] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0038] Figure 1This is a schematic diagram of the structure of a driving device of the present application. Figure 1 As shown, the driving device A of this embodiment is used in an air-to-water heating system, and includes: a bridgeless PFC circuit 1, a fan driving circuit 2, and a compressor driving circuit 3;

[0039] The AC side of the bridgeless PFC circuit 1 is connected to the AC access terminal 4 for receiving AC power, the DC side of the bridgeless PFC circuit 1 is connected to the power supply terminal of the fan drive circuit 2, and the DC side of the bridgeless PFC circuit 1 is connected to the power supply terminal of the compressor drive circuit 3;

[0040] The output end of the fan drive circuit 2 is used to connect to the electrical end of the fan 7 , and the output end of the compressor drive circuit 3 is used to connect to the electrical end of the compressor 8 .

[0041] The bridgeless PFC circuit 1, as the core part of the drive device A, is responsible for converting the AC power provided by the AC access terminal 4 (such as the household power grid) into DC power and performing power factor correction in the process to improve energy utilization and reduce harmonic pollution.

[0042] The fan drive circuit 2 converts the DC power output by the bridgeless PFC circuit 1 into AC power suitable for driving the fan 7. The speed of the fan 7 is adjusted by controlling the amplitude and frequency of the current.

[0043] The compressor drive circuit 3 converts the DC power output by the bridgeless PFC circuit 1 into AC power suitable for driving the compressor 8. By controlling the current and voltage, the operating state of the compressor 8 can be efficiently adjusted.

[0044] As you can understand, the AC side of bridgeless PFC circuit 1 is directly connected to AC input terminal 4, receiving AC power from the grid. Its DC side is connected to the power supply terminals of fan drive circuit 2 and compressor drive circuit 3, respectively, providing stable and efficient DC power for these two circuits. The output terminal of fan drive circuit 2 is provided with a connection interface for connecting to the electrical terminal of fan 7, converting electrical energy into mechanical energy and driving fan 7 to rotate. The output terminal of compressor drive circuit 3 is provided with a connection interface for connecting to the electrical terminal of compressor 8, providing stable power support for compressor 8 to drive its normal operation.

[0045] This embodiment provides a drive device A, comprising: a bridgeless PFC circuit 1, a fan drive circuit 2, and a compressor drive circuit 3; the AC side of the bridgeless PFC circuit 1 is connected to an AC access terminal 4 for receiving AC power, the DC side of the bridgeless PFC circuit 1 is connected to a power supply terminal of the fan drive circuit 2, and the DC side of the bridgeless PFC circuit 1 is connected to a power supply terminal of the compressor drive circuit 3; the output terminal of the fan drive circuit 2 is connected to an electrical terminal of a fan 7, and the output terminal of the compressor drive circuit 3 is connected to an electrical terminal of a compressor 8; the drive device A reduces conduction loss during the power conversion process, improves power utilization, and reduces harmonic pollution, thereby facilitating stable operation of the power grid.

[0046] Figure 2 This is a topology diagram of a bridgeless PFC circuit 1 in a driving device A of the present application. Figure 2 As shown, this embodiment Figure 1 Based on the embodiment, the bridgeless PFC circuit 1 is described in detail. The bridgeless PFC circuit 1 in the driving device A shown in this embodiment includes: a first power correction branch 11 and a second power correction branch 12;

[0047] The input end of the first power correction branch 11 and the input end of the second power correction branch 12 each include two input terminals;

[0048] One input terminal of the first power correction branch 11 is connected to an AC access terminal, the input end of the second power correction branch 12 is connected to another AC access terminal, and the other input terminal of the first power correction branch 11 is connected to the other input terminal of the second power correction branch 12;

[0049] The output end of the first power correction branch 11 and the output end of the second power correction branch 12 are connected in parallel.

[0050] The bridgeless PFC circuit 1 is a power electronics conversion topology that utilizes the positive and negative half-cycles of the AC power supply to drive two independent power correction branches: a first power correction branch 11 and a second power correction branch 12. Each of the first and second power correction branches 11 and 12 has two input terminals, one of which is directly connected to one of the AC power supply input terminals (i.e., the positive or negative half-cycle), while the other input terminals of the two branches are interconnected to form a common midpoint. The output terminals of the two branches are connected in parallel to provide a stable DC power supply to the load (such as the fan drive circuit 2 and the compressor drive circuit 3).

[0051] As can be understood, the bridgeless PFC circuit 1 offers efficient energy conversion and significantly improves the power factor. By directly utilizing the positive and negative half-cycles of the AC power supply, the bridgeless PFC circuit 1 reduces voltage drop and power consumption during the rectification process, thereby improving overall efficiency. Furthermore, the bridgeless PFC circuit 1 effectively reduces harmonics in the power grid, improving power quality.

[0052] Optionally, the first power correction branch 11 includes a first diode 111, a second diode 109, a first inductor 107 and a first switch tube 113;

[0053] The cathode of the first diode 111 is an input terminal of the first power correction branch 11, and the anode of the first diode 111 is another input terminal of the first power correction branch 11; the cathode of the first diode 111 is connected to the anode of the second diode 109 through the first inductor 107, and the cathode of the second diode 109 is an output terminal of the first power correction branch 11; the cathode of the first diode 111 is also connected to the first end of the first switching tube 113 through the first inductor 107, and the second end of the first switching tube 113 is connected to the cathode of the first diode 111, and the second end of the first switching tube 113 is another output terminal of the first power correction branch 11.

[0054] The first power correction branch 11 is a key part for realizing the function of the bridgeless PFC circuit 1 , and is composed of four main components: a first diode 111 , a second diode 109 , a first inductor 107 and a first switch 113 .

[0055] The first diode 111 and the second diode 109 act as rectifying elements in the bridgeless PFC circuit 1, restricting current flow in one direction (from their respective anodes to their respective cathodes). The first inductor 107 is used to store and release energy, helping to smooth the output voltage and reduce current fluctuations. The first switching transistor 113 (typically a controllable switching device such as a MOSFET or IGBT) regulates the current through the inductor through its switching action, thereby controlling the output voltage and correcting the power factor.

[0056] As can be understood, the configuration of the first power correction branch 11 allows it to directly capture energy from a half-cycle (e.g., the positive half-cycle) of the AC power supply and convert it into DC power. The cathode of the first diode 111 serves as an input terminal of the branch and is connected to an input terminal of the AC power supply; the anode of the first diode 111 is connected to the anode of the second diode 109 via the first inductor 107, and the cathode of the first diode 111 is also connected to the first end of the first switching tube 113 via the first inductor 107. The cathode of the second diode 109 and the second end of the first switching tube 113 serve as the two output terminals of the branch, respectively outputting a positive DC voltage and connecting to ground (or a negative DC voltage).

[0057] Optionally, the second power correction branch 12 includes a third diode 112, a fourth diode 110, a second inductor 108 and a second switch tube 114;

[0058] The cathode of the third diode 112 is an input terminal of the second power correction branch 12, and the anode of the third diode 112 is another input terminal of the second power correction branch 12; the cathode of the third diode 112 is connected to the anode of the fourth diode 110 through the second inductor 108, and the cathode of the fourth diode 110 is an output terminal of the second power correction branch 12; the cathode of the third diode 112 is also connected to the first end of the second switching tube 114 through the second inductor 108, and the second end of the second switching tube 114 is connected to the cathode of the third diode 112, and the second end of the second switching tube 114 is another output terminal of the second power correction branch 12.

[0059] The second power correction branch 12 is also a power electronic circuit structure, identical to the first power correction branch 11, and is used to improve the power factor of the power supply system and reduce harmonics. The second power correction branch 12 comprises four key components: a third diode 112, a fourth diode 110, a second inductor 108, and a second switch 114.

[0060] As will be appreciated, the cathode and anode of the third diode 112 serve as the two input terminals of the branch circuit, connected to the AC power supply or the output of the preprocessing circuit. The cathode of the third diode 112 is connected to the anode of the fourth diode 110 via the second inductor 108. This connection point is also connected to the first terminal of the second switching transistor 114 via the second inductor 108. The cathode of the fourth diode 110 and the second terminal of the second switching transistor 114 (connected to the cathode of the third diode 112) serve as the two output terminals of the branch circuit, providing a DC voltage to subsequent circuits.

[0061] The second power correction branch 12 utilizes the positive and negative half-cycles of the AC power supply for power correction. By controlling the switching operation of the second switching transistor 114, the current waveform through the second inductor 108 can be adjusted to be as close to an ideal sine wave as possible, thereby improving the power factor. The provision of the second power correction branch 12 also helps reduce current harmonics, improve power quality, and reduce pollution to the power grid.

[0062] Optionally, the driving device A further includes a noise suppression circuit 13 , and the bridgeless PFC circuit 1 is connected to the AC input terminal 4 via the noise suppression circuit 13 .

[0063] The noise suppression circuit 13 is a key component of the driver A. Its primary function is to establish a barrier between the bridgeless PFC circuit 1 and the AC input terminal 4 to reduce or eliminate electromagnetic interference and radio frequency interference. In other words, the bridgeless PFC circuit 1 is not directly connected to the AC input terminal 4, but rather connected through the noise suppression circuit 13 to ensure circuit stability and reduce electromagnetic pollution to the surrounding environment.

[0064] As can be understood, during operation, the bridgeless PFC circuit 1 generates high-frequency switching and rapid current changes, which can become sources of electromagnetic noise. Without proper filtering, this noise can propagate through the AC input terminal 4 to the power grid, interfering with other electronic devices. The external power grid may also contain various electromagnetic noises. Without the protection of the noise suppression circuit 13, this noise could enter the bridgeless PFC circuit 1 and affect its normal operation. Therefore, the inclusion of the noise suppression circuit 13 is intended to enhance the circuit's anti-interference capabilities and ensure the stability and reliability of the bridgeless PFC circuit 1.

[0065] Optionally, the noise suppression circuit 13 includes a common-mode inductor 102 , an input end of the common-mode inductor 102 is connected to the AC input terminal 4 , and an output end of the common-mode inductor 102 is connected to the input end of the bridgeless PFC circuit 1 .

[0066] The noise suppression circuit 13 includes a common-mode inductor 102. As the core of the noise suppression circuit 13, the common-mode inductor 102 has its input directly connected to the AC input terminal 4 (the power input), receiving AC power from the grid. Its output seamlessly connects to the input of the bridgeless PFC circuit 1, ensuring that the filtered current can be supplied to the bridgeless PFC circuit 1.

[0067] As you can understand, common-mode noise is a common form of interference in power systems. It can be caused by a variety of factors, including internal device switching, improper wiring layout, and the external electromagnetic environment. If left unchecked, this common-mode noise not only interferes with the normal operation of the device itself but can also propagate through power lines into the power grid, adversely affecting other surrounding devices. Common-mode inductor 102, through its unique electromagnetic properties, effectively suppresses the propagation of common-mode noise, protecting bridgeless PFC circuit 1 from interference and thereby improving the stability and reliability of the entire driver A.

[0068] Optionally, the noise suppression circuit 13 includes a first noise capacitor 101 and a second noise capacitor 103 ; the first noise capacitor 101 is connected in parallel to the input end of the common-mode inductor 102 , and the second noise capacitor 103 is connected in parallel to the output end of the common-mode inductor 102 .

[0069] The noise suppression circuit 13 not only includes a common-mode inductor 102 to suppress common-mode noise, but also adds a first noise capacitor 101 and a second noise capacitor 103 to further enhance filtering. These two noise capacitors are connected in parallel at both ends of the common-mode inductor 102: the first noise capacitor 101 is connected in parallel to the input end of the common-mode inductor 102, which is adjacent to the AC input terminal 4; and the second noise capacitor 103 is connected in parallel to the output end of the common-mode inductor 102, which is adjacent to the input end of the bridgeless PFC circuit 1. This configuration forms a more complete filtering network that can more effectively filter out noise components in the power supply.

[0070] Understandably, while the common-mode inductor 102 can suppress common-mode noise to a certain extent, it may not completely eliminate high-frequency or transient noise. By connecting the noise capacitors in parallel, a low-pass filter circuit can be formed to bypass high-frequency noise components, further improving the noise suppression effect. The first noise capacitor 101 primarily acts at the input, filtering out initial noise entering the noise suppression circuit 13. The second noise capacitor 103 is responsible for further removing any noise that may remain at the output after the noise is suppressed by the common-mode inductor 102, ensuring a purer current entering the bridgeless PFC circuit 1.

[0071] Optionally, the noise suppression circuit 13 includes a third noise capacitor 105 and a fourth noise capacitor 106, wherein a first end of the third noise capacitor 105 is connected to one output terminal of the common-mode inductor 102, and a second end of the third noise capacitor 105 is grounded; a first end of the fourth noise capacitor 106 is grounded, and a second end of the fourth noise capacitor 106 is connected to the other output terminal of the common-mode inductor 102.

[0072] The third noise capacitor 105 and the fourth noise capacitor 106 form a more complex filtering network. One end of the third noise capacitor 105 is connected to one output terminal of the common-mode inductor 102, and the other end is grounded. Meanwhile, one end of the fourth noise capacitor 106 is grounded, and the other end is connected to the other output terminal of the common-mode inductor 102. This "ground-common-mode inductor 102-ground" capacitor connection helps further filter differential-mode noise and residual common-mode noise in the circuit, improving the noise suppression performance of the bridgeless PFC circuit 1.

[0073] As can be understood, the third and fourth noise capacitors 105 and 106 provide an additional differential-mode noise suppression path for the circuit, in addition to the common-mode inductor 102. Differential-mode noise is noise that exists between the positive and negative power lines, transmitted along with the signal current, and significantly impacts circuit performance. By grounding one end of the third and fourth noise capacitors 106, a low-impedance noise return path is formed, allowing differential-mode noise to be more easily bypassed to ground, thereby reducing its impact on the circuit, further attenuating common-mode noise, and improving the overall anti-interference capability of the bridgeless PFC circuit 1.

[0074] Optionally, the bridgeless PFC circuit 1 further includes an absorption capacitor 115 and a film capacitor 116;

[0075] The absorption capacitor 115 and the film capacitor 116 are both connected in parallel to the output end of the first power correction branch 11 .

[0076] The absorption capacitor 115 is usually used to absorb transient energy or voltage spikes in the circuit, while the film capacitor 116 is characterized by high stability and low loss.

[0077] In addition to the power correction elements, the bridgeless PFC circuit 1 also includes a snubber capacitor 115 and a thin-film capacitor 116. Snubber capacitor 115 and thin-film capacitor 116 are connected in parallel at the output end of the first power correction branch 11. This configuration enhances the power factor correction effect of the bridgeless PFC circuit 1 and helps improve the waveform quality of the output voltage.

[0078] Snubber capacitor 115 can quickly respond to transient changes in bridgeless PFC circuit 1, absorbing excess energy or voltage spikes. Snubber capacitor 115 improves the reliability and stability of bridgeless PFC circuit 1. Film capacitor 116 more effectively smooths the output voltage, reducing voltage fluctuations and ripple, and ensuring output voltage stability and purity. The parallel use of snubber capacitor 115 and film capacitor 116 enhances the power factor correction capability and output voltage quality of bridgeless PFC circuit 1.

[0079] The bridgeless PFC circuit 1 in this embodiment is a key component of the drive device A. It achieves efficient power factor correction through a first power correction branch 11 and a second power correction branch 12. The first power correction branch 11 and the second power correction branch 12 independently receive different phase inputs from the AC power source. These two power correction branches, respectively, include diodes, inductors, and switches, achieving synchronization of the current and voltage waveforms. Furthermore, the bridgeless PFC circuit 1 integrates a noise suppression circuit 13, which utilizes a combination of a common-mode inductor 102 and multiple noise capacitors to effectively filter electromagnetic interference from the AC input terminal 4. The parallel arrangement of an absorption capacitor 115 and a thin-film capacitor 116 at the output of the power correction branch further enhances the circuit's anti-interference capability and output stability. Consequently, the bridgeless PFC circuit 1 reduces harmonic interference and improves energy efficiency.

[0080] Figure 3 This is a schematic diagram of the structure of an air-to-water hot water system in this application. Figure 1 As shown, the air energy water heating system of this embodiment includes: a driving device A, a fan 7 and a compressor 8;

[0081] The DC side of the driving device A is connected to the electrical end of the fan 7 , and the DC side of the driving device A is also connected to the electrical end of the compressor 8 .

[0082] The air-energy water heating system of this embodiment includes a drive unit A, a fan 7, and a compressor 8. Drive unit A, as the core of energy supply and regulation, has its DC side directly connected to the electrical terminal of fan 7, providing stable power to drive air flow. Simultaneously, this DC side seamlessly connects to the electrical terminal of compressor 8, ensuring that compressor 8 receives sufficient power to efficiently compress the refrigerant and achieve the circulation and conversion of thermal energy. This system optimizes energy distribution and utilization, improving the operating efficiency and stability of the entire heat pump system.

[0083] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0084] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly requires otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0085] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0086] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A driving device, characterized in that: include: A bridgeless PFC circuit (1), a fan drive circuit (2), and a compressor drive circuit (3); The AC side of the bridgeless PFC circuit (1) is connected to the AC access terminal (4) for receiving AC power, the DC side of the bridgeless PFC circuit (1) is connected to the power supply terminal of the fan drive circuit (2), and the DC side of the bridgeless PFC circuit (1) is connected to the power supply terminal of the compressor drive circuit (3); The output end of the fan drive circuit (2) is used to connect to the electrical end of the fan (7), and the output end of the compressor drive circuit (3) is used to connect to the electrical end of the compressor (8).

2. The driving device according to claim 1, characterized in that The bridgeless PFC circuit (1) comprises a first power correction branch (11) and a second power correction branch (12); The input end of the first power correction branch (11) and the input end of the second power correction branch (12) each include two input terminals; An input terminal of the first power correction branch (11) is connected to an AC access terminal, an input end of the second power correction branch (12) is connected to another AC access terminal, and another input terminal of the first power correction branch (11) is connected to another input terminal of the second power correction branch (12); The output end of the first power correction branch (11) and the output end of the second power correction branch (12) are connected in parallel.

3. The driving device according to claim 2, characterized in that The first power correction branch (11) comprises a first diode (111), a second diode (109), a first inductor (107) and a first switch tube (113); The cathode of the first diode (111) is an input terminal of the first power correction branch (11), and the anode of the first diode (111) is another input terminal of the first power correction branch (11); the cathode of the first diode (111) is connected to the anode of the second diode (109) through the first inductor (107), and the cathode of the second diode (109) is an output terminal of the first power correction branch (11); the cathode of the first diode (111) is also connected to the first end of the first switching tube (113) through the first inductor (107), and the second end of the first switching tube (113) is connected to the cathode of the first diode (111), and the second end of the first switching tube (113) is another output terminal of the first power correction branch (11).

4. The driving device according to claim 2, characterized in that The second power correction branch (12) includes a third diode (112), a fourth diode (110), a second inductor (108) and a second switch tube (114); The cathode of the third diode (112) is an input terminal of the second power correction branch (12), and the anode of the third diode (112) is another input terminal of the second power correction branch (12); the cathode of the third diode (112) is connected to the anode of the fourth diode (110) through the second inductor (108), and the cathode of the fourth diode (110) is an output terminal of the second power correction branch (12); the cathode of the third diode (112) is also connected to the first end of the second switch tube (114) through the second inductor (108), the second end of the second switch tube (114) is connected to the cathode of the third diode (112), and the second end of the second switch tube (114) is another output terminal of the second power correction branch (12).

5. The driving device according to claim 1, characterized in that The driving device (A) further includes a noise suppression circuit (13), and the bridgeless PFC circuit (1) is connected to the AC access terminal (4) via the noise suppression circuit (13).

6. The driving device according to claim 5, characterized in that The noise suppression circuit (13) includes a common-mode inductor (102), an input end of the common-mode inductor (102) is connected to the AC access end (4), and an output end of the common-mode inductor (102) is connected to the input end of the bridgeless PFC circuit (1).

7. The driving device according to claim 6, characterized in that The noise suppression circuit (13) comprises a first noise capacitor (101) and a second noise capacitor (103); the first noise capacitor (101) is connected in parallel to the input end of the common-mode inductor (102), and the second noise capacitor (103) is connected in parallel to the output end of the common-mode inductor (102).

8. The driving device according to claim 7, characterized in that The noise suppression circuit (13) comprises a third noise capacitor (105) and a fourth noise capacitor (106), wherein a first end of the third noise capacitor (105) is connected to one output terminal of the common-mode inductor (102), and a second end of the third noise capacitor (105) is grounded; a first end of the fourth noise capacitor (106) is grounded, and a second end of the fourth noise capacitor (106) is connected to the other output terminal of the common-mode inductor (102).

9. The driving device according to claim 2, characterized in that The bridgeless PFC circuit (1) further includes an absorption capacitor (115) and a film capacitor (116); The absorption capacitor (115) and the film capacitor (116) are both connected in parallel to the output end of the first power correction branch (11).

10. An air-to-water heating system, characterized in that: It comprises a drive device (A), a fan (7) and a compressor (8) as described in any one of claims 1 to 9; the DC side of the drive device (A) is connected to the electrical end of the fan (7), and the DC side of the drive device (A) is also connected to the electrical end of the compressor (8).

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