Driving power supply and electric fan

Abstract

The utility model provides a driving power supply and an electric fan. The driving power supply comprises a rectification module, a first filtering module and a motor driving module. The input end of the rectifier module is connected with an alternating current power supply, the positive output end of the rectifier module is connected with the positive input end of the first filter module, and the negative output end of the rectifier module is connected with the negative input end of the first filter module; the positive input end of the motor driving module is connected with the positive output end of the first filtering module, the negative input end of the motor driving module is connected with the negative output end of the first filtering module, and the output end of the motor driving module is used for driving a motor to rotate. The first filter module is arranged behind the rectifier module, so that noise caused by the motor can be suppressed, and the electromagnetic compatibility of the whole equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a driving power supply and an electric fan. Background Art

[0002] The blades of the electric fan are driven by a motor to rotate, which in turn allows the surrounding air to flow and generate wind, which is used to supply air to the room. It has a good heat-relief function and saves energy and electricity.

[0003] In the prior art, electric fans are usually driven by motors after AC rectification. In order to avoid noise interference introduced by the AC power supply, filtering is usually set on the AC power supply side to suppress the noise interference introduced by the AC power supply, but it cannot suppress the interference generated by the motor itself. Utility Model Content

[0004] The embodiment of the utility model provides a driving power supply and an electric fan to solve the problem in the prior art that the fan motor introduces noise interference and affects the electromagnetic compatibility characteristics of the electric fan.

[0005] In a first aspect, an embodiment of the utility model provides a driving power supply, including: a rectifier module, a first filter module and a motor driving module;

[0006] The input end of the rectifier module is used to connect to the AC power supply, the positive output end of the rectifier module is connected to the positive input end of the first filter module, and the negative output end of the rectifier module is connected to the negative input end of the first filter module;

[0007] The positive input end of the motor driving module is connected to the positive output end of the first filtering module, the negative input end of the motor driving module is connected to the negative output end of the first filtering module, and the output end of the motor driving module is used to drive the motor to rotate.

[0008] Optionally, the first filtering module includes: at least one common mode filtering unit;

[0009] Each common mode filter unit is connected hand in hand

[0010] Among them, the positive input end of the first common mode filter unit is connected to the positive input end of the first filter module, and the negative input end of the first common mode filter unit is connected to the negative input end of the first filter module; the positive output end of the last common mode filter unit is connected to the positive output end of the first filter module, and the negative output end of the last common mode filter unit is connected to the negative output end of the first filter module.

[0011] Optionally, the common mode filtering unit includes: a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, wherein the first inductor and the second inductor are common mode inductors;

[0012] The first end of the first inductor is connected to the first end of the first capacitor and the positive input end of the common mode filter unit, and the second end of the first inductor is connected to the first end of the third capacitor and the positive output end of the common mode filter unit;

[0013] The first end of the second inductor is connected to the first end of the second capacitor and the negative input end of the common mode filter unit, and the second end of the second inductor is connected to the first end of the fourth capacitor and the negative output end of the common mode filter unit;

[0014] The second end of the first capacitor, the second end of the second capacitor, the second end of the third capacitor and the second end of the fourth capacitor are all grounded.

[0015] Optionally, the first filtering module further includes: a varistor and a thermistor;

[0016] The first end of the varistor is connected to the positive input end of the first common-mode filter unit and the positive input end of the first filter module respectively, the second end of the varistor is connected to the negative input end of the first common-mode filter unit, and the second end of the varistor is also connected to the negative input end of the first filter module through a thermistor.

[0017] Optionally, the first filtering module includes: at least one differential mode filtering unit;

[0018] Each differential mode filter unit is connected hand in hand;

[0019] Among them, the positive input end of the first differential mode filter unit is connected to the positive input end of the first filter module, and the negative input end of the first differential mode filter unit is connected to the negative input end of the first filter module; the positive output end of the last differential mode filter unit is connected to the positive output end of the first filter module, and the negative output end of the last differential mode filter unit is connected to the negative output end of the first filter module.

[0020] Optionally, the differential mode filtering unit includes: a third inductor, a fifth capacitor and a sixth capacitor;

[0021] The first end of the third inductor is respectively connected to the first end of the fifth capacitor and the positive input end of the differential mode filter unit, and the second end of the third inductor is respectively connected to the first end of the sixth capacitor and the positive output end of the differential mode filter unit;

[0022] The second end of the fifth capacitor is respectively connected to the second end of the sixth capacitor, the negative input end of the differential mode filter unit, and the negative output end of the differential mode filter unit.

[0023] Optionally, the first filtering module includes: at least one common mode filtering unit and at least one differential mode filtering unit;

[0024] Each common mode filter unit and each differential mode filter unit are connected hand in hand in sequence.

[0025] Optionally, the driving power supply further includes: a DCDC module;

[0026] The positive input terminal of the DCDC module is connected to the positive output terminal of the first filter module, the negative input terminal of the DCDC module is connected to the positive output terminal of the first filter module, the positive output terminal of the DCDC module is connected to the positive input terminal of the motor drive module, and the negative output terminal of the DCDC module is connected to the negative input terminal of the motor drive module.

[0027] Optionally, the driving power supply further includes: a second filtering module;

[0028] The input end of the second filter module is used to be connected to the AC power supply, and the output end of the second filter module is connected to the input end of the rectifier module.

[0029] In a second aspect, an embodiment of the utility model provides an electric fan, comprising a driving power supply, a motor, at least one first wireless interface and at least one second wireless interface provided in the first aspect of the embodiment of the utility model; wherein at least one first wireless interface is located on a first communication module, and at least one second wireless interface is located on a second communication module; and the frequencies of each first wireless interface and each second wireless interface are the same;

[0030] Each first wireless interface and each second wireless interface are connected to a driving power source for communication;

[0031] The driving power source drives the motor to rotate.

[0032] The embodiment of the utility model provides a driving power supply and an electric fan. The driving power supply includes: a rectifier module, a first filter module and a motor drive module; the input end of the rectifier module is used to connect to the AC power supply, the positive output end of the rectifier module is connected to the positive input end of the first filter module, and the negative output end of the rectifier module is connected to the negative input end of the first filter module; the positive input end of the motor drive module is connected to the positive output end of the first filter module, the negative input end of the motor drive module is connected to the negative output end of the first filter module, and the output end of the motor drive module is used to drive the motor to rotate. In the embodiment of the utility model, a first filter module is arranged after the rectifier module, which can filter out the noise brought by the motor itself, suppress the current ripple introduced by the load, and improve the overall electromagnetic compatibility characteristics of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 This is a schematic diagram of the circuit structure of a driving power supply provided by an embodiment of the utility model;

[0035] Figure 2 This is a schematic diagram of the circuit structure of a first filtering module provided by an embodiment of the utility model;

[0036] Figure 3 This is a circuit schematic diagram of a common mode filtering unit provided by an embodiment of the utility model;

[0037] Figure 4 This is a schematic diagram of the circuit structure of the second first filter module provided by an embodiment of the utility model;

[0038] Figure 5 This is a schematic diagram of the circuit structure of the third first filter module provided by the embodiment of the utility model;

[0039] Figure 6 This is a circuit schematic diagram of a differential mode filter unit provided by an embodiment of the utility model;

[0040] Figure 7 This is a schematic diagram of the circuit structure of the fourth first filter module provided by an embodiment of the utility model;

[0041] Figure 8 This is a schematic diagram of the circuit structure of the fifth first filter module provided by an embodiment of the utility model;

[0042] Fig. 9 This is a schematic diagram of the circuit structure of another driving power supply provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0043] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0044] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0045] The following is a detailed description of the implementation of the present invention in conjunction with the specific drawings:

[0046] Figure 1This is a schematic diagram of the structure of a driving power supply provided by an embodiment of the utility model. Figure 1 , the driving power supply includes: a rectifier module 11, a first filter module 12 and a motor driving module 13;

[0047] The input end of the rectifier module 11 is used to connect to the AC power supply, the positive output end of the rectifier module 11 is connected to the positive input end of the first filter module 12, and the negative output end of the rectifier module 11 is connected to the negative input end of the first filter module 12;

[0048] The positive input end of the motor driving module 13 is connected to the positive output end of the first filtering module 12 , the negative input end of the motor driving module 13 is connected to the negative output end of the first filtering module 12 , and the output end of the motor driving module 13 is used to drive the motor to rotate.

[0049] In the embodiment of the utility model, the first filter module 12 is connected to the rear end of the rectifier module 11, which can effectively suppress the noise introduced by the load end (motor), reduce the current ripple, and effectively improve the overall electromagnetic compatibility characteristics of the device where the driving power supply is located.

[0050] In one possible implementation, reference Figure 2 , the first filtering module 12 may include: at least one common mode filtering unit 121;

[0051] Each common mode filter unit 121 is connected hand in hand

[0052] Among them, the positive input end of the first common-mode filter unit 121 is connected to the positive input end of the first filter module 12, and the negative input end of the first common-mode filter unit 121 is connected to the negative input end of the first filter module 12; the positive output end of the last common-mode filter unit 121 is connected to the positive output end of the first filter module 12, and the negative output end of the last common-mode filter unit 121 is connected to the negative output end of the first filter module 12.

[0053] In the embodiment of the utility model, the first filtering module 12 may include multiple common-mode filtering units 121 to filter out common-mode noise in the circuit. At the same time, multiple stages of common-mode filtering units 121 are connected in series, and multiple filtering is performed to achieve better filtering effect.

[0054] In one possible implementation, reference Figure 3 , the common mode filtering unit 121 may include: the common mode filtering unit includes: a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, wherein the first inductor L1 and the second inductor L2 are common mode inductors;

[0055] The first end of the first inductor L1 is connected to the first end of the first capacitor C1 and the positive input end of the common mode filter unit, and the second end of the first inductor L1 is connected to the first end of the third capacitor C3 and the positive output end of the common mode filter unit;

[0056] A first end of the second inductor L2 is connected to a first end of the second capacitor C2 and a negative input end of the common mode filter unit, and a second end of the second inductor L2 is connected to a first end of the fourth capacitor C4 and a negative output end of the common mode filter unit;

[0057] A second end of the first capacitor C1 , a second end of the second capacitor C2 , a second end of the third capacitor C3 , and a second end of the fourth capacitor C4 are all grounded.

[0058] The first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are common mode capacitors, one end of which is connected to the power line and the other end is grounded, and are used to filter out common mode noise and improve the performance of common mode suppression in the circuit.

[0059] The first inductor L1 and the second inductor L2 are common mode inductors, which are usually formed by winding the same number of turns but in opposite directions on the upper and lower half rings of the ferrite magnetic ring to weaken the common mode noise. However, since the number of turns of the first inductor L1 and the second inductor L2 cannot be exactly the same, there will be a certain leakage inductance, so it also has a certain attenuation and suppression effect on the differential mode signal.

[0060] Based on the above, the common-mode filtering unit 121 provided in the embodiment of the utility model is mainly used to suppress common-mode noise, and also has a certain inhibitory effect on differential-mode noise. It can effectively attenuate and suppress fluctuations such as distortion on the DC bus and interference signals, thereby improving the electromagnetic compatibility characteristics of the equipment.

[0061] Furthermore, since the filter module in the embodiment of the utility model is arranged at the rear end of the rectifier module 11, the frequency is close to 0 and the voltage change amplitude is small. Therefore, the loss of each capacitor in the common-mode filter unit 121 is relatively small. Compared with the filter circuit on the AC power supply side, the capacitor can be set smaller, the cost is lower, and the volume can also be smaller.

[0062] It should be noted that the circuit structure of the common mode filtering unit 121 is not limited to the above circuit structure, and may also be other structures, all of which are within the protection scope of the present application and are not specifically limited.

[0063] In one possible implementation, reference Figure 4 , the common mode filtering unit 121 may further include: a varistor RV and a thermistor NTC;

[0064] The first end of the varistor RV is connected to the positive input end of the first common-mode filter unit and the positive input end of the first filter module 12 respectively, the second end of the varistor RV is connected to the negative input end of the first common-mode filter unit, and the second end of the varistor RV is also connected to the negative input end of the first filter module 12 through the thermistor NTC.

[0065] In the embodiment of the utility model, the first filter module 12 is also provided with a varistor RV on the side close to the rectifier module 11. The resistance of the varistor RV is relatively high, which can effectively damp and absorb noise and interference in the circuit. At the same time, when the voltage difference across the varistor RV exceeds the rated value, its resistance value will drop rapidly, thereby absorbing the peak current in the circuit, with fast response speed and good filtering effect.

[0066] Furthermore, the rectifier module 11 can usually adopt a rectifier bridge. When the voltage difference across the varistor RV exceeds the rated value, its resistance will drop rapidly and the current in the loop will increase rapidly. Therefore, a thermistor NTC is set in the loop to prevent large current from damaging the rectifier bridge.

[0067] In one possible implementation, reference Figure 5 , the first filtering module 12 may include: at least one differential mode filtering unit 122;

[0068] The differential mode filter units 122 are connected hand in hand;

[0069] Among them, the positive input end of the first differential mode filter unit 122 is connected to the positive input end of the first filter module 12, and the negative input end of the first differential mode filter unit 122 is connected to the negative input end of the first filter module 12; the positive output end of the last differential mode filter unit 122 is connected to the positive output end of the first filter module 12, and the negative output end of the last differential mode filter unit 122 is connected to the negative output end of the first filter module 12.

[0070] The first filter module 12 may further include at least one differential mode filter unit 122 to filter out differential mode noise in the circuit. At the same time, multiple stages of differential mode filter units 122 are connected in series, and the filtering effect is good.

[0071] In one possible implementation, reference Figure 6 , the differential mode filtering unit 122 may include: the differential mode filtering unit may include: a third inductor L3, a fifth capacitor C5 and a sixth capacitor C6;

[0072] The first end of the third inductor L3 is respectively connected to the first end of the fifth capacitor C5 and the positive input end of the differential mode filter unit 122, and the second end of the third inductor L3 is respectively connected to the first end of the sixth capacitor C6 and the positive output end of the differential mode filter unit 122;

[0073] The second end of the fifth capacitor C5 is connected to the second end of the sixth capacitor C6 , the negative input end of the differential mode filter unit 122 , and the negative output end of the differential mode filter unit 122 , respectively.

[0074] In the embodiment of the present utility model, the third inductor L3 is a differential mode inductor, and the fifth capacitor C5 and the sixth capacitor C6 are differential mode capacitors. Based on the above, the differential mode filter unit 122 provided in the embodiment of the present utility model is mainly used to suppress differential mode noise, and can effectively attenuate and suppress noise and interference signals, thereby improving the electromagnetic compatibility characteristics of the device.

[0075] It should be noted that the circuit structure of the differential mode filter unit 122 is not limited to the above circuit structure, and can also be other T-type, L-type or II-type filter circuits, all of which are within the protection scope of this application and are not specifically limited.

[0076] In one possible implementation, reference Figure 7 and Figure 8 , the first filtering module 12 may include: at least one common mode filtering unit 121 and at least one differential mode filtering unit 122;

[0077] The common-mode filter units 121 and the differential-mode filter units 122 are connected hand in hand in sequence.

[0078] Since the common-mode filter unit 121 is mainly used for common-mode suppression, and the differential-mode filter unit 122 is mainly used for differential-mode suppression, in the embodiment of the utility model, the common-mode filter unit 121 and the differential-mode filter unit 122 can be connected in series in multiple stages to form a first filter module 12, which has a good suppression effect on both common-mode noise and differential-mode noise, and the filtering effect is further improved by connecting in multiple stages in series.

[0079] Specifically, refer to Figure 7 In the first filtering module 12, the multi-stage differential mode filtering units 122 can be connected in series first and then connected in series with the multi-stage common mode filtering units 121, or the multi-stage common mode filtering units 121 can be connected in series first and then connected in series with the multi-stage differential mode filtering units 122.

[0080] Preferably, reference Figure 8 , it can also be formed by cross-connecting the common mode filter unit 121 and the differential mode filter unit 122 in series, and the specific series connection order is not limited here.

[0081] It should be noted that each common-mode filter unit 121 and each differential-mode filter unit 122 is not limited to the hand-in-hand connection method, but may also include other connection methods, all of which are within the protection scope of the present application.

[0082] for Figure 7 and Figure 8The first filter module 12 shown in the figure can also be provided with a varistor RV and a thermistor NTC at the front end to filter out differential mode noise and protect the rectifier bridge. Figure 4 , the details will not be repeated here.

[0083] In one possible implementation, reference Fig. 9 , the above-mentioned driving power supply may further include: a DCDC module 14;

[0084] The positive input end of the DCDC module 14 is connected to the positive output end of the first filter module 12, the negative input end of the DCDC module 14 is connected to the positive output end of the first filter module 12, the positive output end of the DCDC module 14 is connected to the positive input end of the motor drive module 13, and the negative output end of the DCDC module 14 is connected to the negative input end of the motor drive module 13.

[0085] The DCDC module 14 is used to perform DC conversion and provide a suitable DC voltage for the motor drive module 13. The first filter module 12 is arranged at the front end of the DCDC module 14 and can also be used to suppress the noise generated by the DCDC module 14.

[0086] In one possible implementation, reference Fig. 9 , the above-mentioned driving power supply may further include: a first DC bus capacitor C7 and a second DC bus capacitor C8;

[0087] The first DC bus capacitor C7 is connected between the positive input terminal and the negative input terminal of the DCDC module 14, and the second DC bus capacitor C8 is connected between the positive output terminal and the negative output terminal of the DCDC module 14, for smoothing voltage fluctuations and improving the stability and reliability of the circuit.

[0088] In one possible implementation, reference Fig. 9 , the above-mentioned driving power supply may further include: a second filtering module 15;

[0089] The input end of the second filter module 15 is used to be connected to the AC power supply, and the output end of the second filter module 15 is connected to the input end of the rectifier module 11 .

[0090] In the embodiment of the utility model, a second filter module 15 can also be provided on the AC power supply side. The second filter module 15 is an AC filter module for filtering out noise and interference introduced by the AC power supply, thereby further improving the electromagnetic compatibility characteristics of the circuit.

[0091] The specific circuit of the second filtering module 15 is prior art in the art and will not be described in detail here.

[0092] In one possible implementation, reference Fig. 9The motor is a three-phase motor, and the output end of the motor driving module includes: an A-phase output end, a B-phase output end, and a C-phase output end; the above-mentioned driving power supply also includes: a fourth inductor L4, a fifth inductor L5, and a sixth inductor L6; wherein the fourth inductor L4, the fifth inductor L5, and the sixth inductor L6 are common-mode inductors;

[0093] The fourth inductor L4, the fifth inductor L5 and the sixth inductor L6 are connected in series correspondingly between the A-phase output terminal, the B-phase output terminal and the C-phase output terminal and the three-phase motor.

[0094] In the embodiment of the utility model, a three-phase common-mode filter inductor (a fourth inductor L4, a fifth inductor L5 and a sixth inductor L6) is also provided at the front end of the motor to filter out the influence of noise and interference generated during the operation of the motor on the front end, thereby further improving the electromagnetic compatibility characteristics of the circuit.

[0095] Corresponding to the above embodiment, the embodiment of the utility model further provides an electric fan, comprising a driving power supply, a motor, at least one first wireless interface and at least one second wireless interface provided in the above embodiment; wherein at least one first wireless interface is located on the first communication module, and at least one second wireless interface is located on the second communication module; the frequency of each first wireless interface and each second wireless interface is the same;

[0096] Each first wireless interface and each second wireless interface are connected to a driving power source for communication;

[0097] The driving power source drives the motor to rotate.

[0098] In the embodiment of the utility model, the electric fan is provided with at least one first wireless interface and at least one second wireless interface to communicate with other devices, for example, a remote controller, a mobile phone, a server, and the like.

[0099] At least one first wireless interface is on one communication module, and at least one second wireless interface library is on one communication module. Since the frequencies are the same, the same antenna can be used to save costs.

[0100] Exemplarily, there are two second wireless interfaces, one is a BLE interface and the other is a WIFI interface, both of which are in the same frequency as WIFI and share an antenna. The WIFI interface is used to communicate with an external cloud or server to synchronize data, and the BLE interface is used for network configuration, local mobile phone control (APP) or remote control. The network configuration experience is simpler, and there is no need to repeatedly switch the operation interface to enter the mobile phone wireless LAN to connect to WiFi.

[0101] The first wireless interface may be one, which is a BLE interface or a WIFI interface, and is used for remote control. Corresponding to the above embodiment, there are two second wireless interfaces and one first wireless interface;

[0102] The first wireless interface is used to be consistent with the first user's instructions or synchronized with the first user's control device information, and it uses the first communication protocol (such as using WIFI or BLE remote control and corresponding interface); the first second wireless interface is used to be consistent with the second user's instructions or synchronized with the second user's control device information, and it uses the second communication protocol (such as using mobile phone BLE and corresponding interface); the second second wireless interface is used to be consistent with the third user's instructions or synchronized with the third user's control device information through a server or cloud, and it uses a third communication protocol (such as using WIFI to communicate with the server or cloud in two directions); wherein, the second wireless communication protocol and the third wireless communication protocol may be different, for example, WIFI and BLE respectively. The first wireless communication protocol, the second wireless communication protocol and the third wireless communication protocol may also be the same, and the three communication protocols are all WIFI or all BLE. For example, the three wireless communication interfaces are all WIFI. If the three communication protocols are the same, the development efficiency can be high, the specifications are unified, and the cost of professional resources is reduced.

[0103] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A driving power supply, characterized in that: include: Rectification module, first filtering module and motor driving module; The input end of the rectifier module is used to connect to the AC power supply, the positive output end of the rectifier module is connected to the positive input end of the first filter module, and the negative output end of the rectifier module is connected to the negative input end of the first filter module; The positive input end of the motor driving module is connected to the positive output end of the first filtering module, the negative input end of the motor driving module is connected to the negative output end of the first filtering module, and the output end of the motor driving module is used to drive the motor to rotate.

2. The driving power supply according to claim 1, characterized in that: The first filtering module includes: at least one common mode filtering unit; Each common mode filter unit is connected hand in hand Among them, the positive input end of the first common mode filter unit is connected to the positive input end of the first filter module, and the negative input end of the first common mode filter unit is connected to the negative input end of the first filter module; the positive output end of the last common mode filter unit is connected to the positive output end of the first filter module, and the negative output end of the last common mode filter unit is connected to the negative output end of the first filter module.

3. The driving power supply according to claim 2, characterized in that: The common mode filtering unit comprises: a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, wherein the first inductor and the second inductor are common mode inductors; The first end of the first inductor is connected to the first end of the first capacitor and the positive input end of the common mode filter unit, and the second end of the first inductor is connected to the first end of the third capacitor and the positive output end of the common mode filter unit; The first end of the second inductor is connected to the first end of the second capacitor and the negative input end of the common mode filter unit, and the second end of the second inductor is connected to the first end of the fourth capacitor and the negative output end of the common mode filter unit; The second end of the first capacitor, the second end of the second capacitor, the second end of the third capacitor and the second end of the fourth capacitor are all grounded.

4. The driving power supply according to claim 2, characterized in that: The first filtering module also includes: a varistor and a thermistor; The first end of the varistor is connected to the positive input end of the first common-mode filter unit and the positive input end of the first filter module respectively, the second end of the varistor is connected to the negative input end of the first common-mode filter unit, and the second end of the varistor is also connected to the negative input end of the first filter module through the thermistor.

5. The driving power supply according to claim 1, characterized in that: The first filtering module includes: at least one differential mode filtering unit; Each differential mode filter unit is connected hand in hand; Among them, the positive input end of the first differential mode filter unit is connected to the positive input end of the first filter module, and the negative input end of the first differential mode filter unit is connected to the negative input end of the first filter module; the positive output end of the last differential mode filter unit is connected to the positive output end of the first filter module, and the negative output end of the last differential mode filter unit is connected to the negative output end of the first filter module.

6. The driving power supply according to claim 5, characterized in that: The differential mode filter unit comprises: a third inductor, a fifth capacitor and a sixth capacitor; The first end of the third inductor is respectively connected to the first end of the fifth capacitor and the positive input end of the differential mode filter unit, and the second end of the third inductor is respectively connected to the first end of the sixth capacitor and the positive output end of the differential mode filter unit; The second end of the fifth capacitor is respectively connected to the second end of the sixth capacitor, the negative input end of the differential mode filter unit, and the negative output end of the differential mode filter unit.

7. The driving power supply according to claim 1, characterized in that: The first filtering module includes: at least one common mode filtering unit and at least one differential mode filtering unit; Each common mode filter unit and each differential mode filter unit are connected hand in hand in sequence.

8. The driving power supply according to any one of claims 1 to 7, characterized in that: The driving power supply further includes: a DCDC module; The positive input end of the DCDC module is connected to the positive output end of the first filter module, the negative input end of the DCDC module is connected to the positive output end of the first filter module, the positive output end of the DCDC module is connected to the positive input end of the motor drive module, and the negative output end of the DCDC module is connected to the negative input end of the motor drive module.

9. The driving power supply according to any one of claims 1 to 7, characterized in that: The driving power supply further includes: a second filtering module; The input end of the second filter module is used to be connected to the AC power supply, and the output end of the second filter module is connected to the input end of the rectifier module.

10. An electric fan, characterized in that: The invention comprises a driving power source as claimed in any one of claims 1 to 9, a motor, at least one first wireless interface and at least one second wireless interface; wherein at least one first wireless interface is located on a first communication module, and at least one second wireless interface is located on a second communication module; and the frequencies of the first wireless interfaces and the second wireless interfaces are the same; Each first wireless interface and each second wireless interface are connected to the driving power supply for communication; The driving power source drives the motor to rotate.

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