CN218388095U - Printed circuit board and electrical equipment - Google Patents

Abstract

The embodiment of the utility model provides a printed circuit board and electrical equipment relates to domestic appliance technical field, is provided with control module on this printed circuit board, and control module includes EMC filter circuit, PFC circuit, rectifier circuit and direct current filter circuit, and wherein, direct current filter circuit sets up in one side of printed circuit board, and EMC filter circuit sets up the opposite side at printed circuit board, PFC circuit and rectifier circuit set up at EMC filter circuit with between the direct current filter circuit. Through being integrated as one with a plurality of printed circuit board, reduced because of a plurality of printed circuit board reduce that a plurality of printed circuit board have occupied the influence that great space caused to the domestic appliance miniaturization, improved the stability of printed circuit board in production and transportation to keep away from the setting with the part and the temperature sensitive part that generate heat in the printed circuit board, reduce because of a plurality of printed circuit board are integrated after, the part that generates heat is to whole circuit board job stabilization nature's influence.

Description

Printed circuit board and electrical equipment

Technical Field

The utility model relates to the technical field of household appliances, especially, relate to a printed circuit board and electrical equipment.

Background

Air conditioner, swimming pool machine etc. electric appliances have become essential domestic appliance in people's daily life gradually, can provide comfortable living environment for people through control air conditioner or swimming pool machine work, and air conditioner or swimming pool machine mainly realize its function through the operation of the corresponding motor of control module control or compressor of integrated on printed circuit board.

At present, a plurality of heating components are arranged in a control module on a printed circuit board, and in order to ensure good heat dissipation of the printed circuit board, different heating components are generally arranged on different printed circuit boards, and then the printed circuit boards are connected together to form a complete control circuit board.

However, the home appliances have been gradually developed toward miniaturization, a plurality of printed circuit boards occupy a large space, a certain limitation is imposed on miniaturization of the home appliances, and a combination of a plurality of printed circuit boards is also liable to cause a problem during production and transportation.

SUMMERY OF THE UTILITY MODEL

The utility model provides a printed circuit board and electrical equipment is through being in the same place the control module integration on a plurality of printed circuit boards to reduce the space that printed circuit board occupied and improve the stability in production and transportation.

In a first aspect, the present invention provides a printed circuit board, including:

the printed circuit board is provided with a control module, the control module comprises an EMC filter circuit, a PFC circuit, a rectification circuit and a direct current filter circuit, wherein the control module comprises an EMC filter circuit, a PFC circuit, a rectification circuit and a direct current filter circuit

The direct current filter circuit is arranged on one side of the printed circuit board, the EMC filter circuit is arranged on the other side of the printed circuit board, and the PFC circuit and the rectification circuit are arranged between the EMC filter circuit and the direct current filter circuit.

Optionally, the PFC circuit, the EMC filter circuit, and the dc filter circuit are disposed at an interval, and the rectifier circuit is disposed close to the PFC circuit.

Optionally, the PFC circuit includes a PFC circuit inductor and a PFC power device, wherein the PFC circuit inductor and the PFC power device are connected to each other

The PFC circuit inductance is arranged close to the EMC filter circuit;

the PFC power device is arranged close to the direct current filter circuit and is arranged on the back of the printed circuit board.

Optionally, the projection of the PFC power device on the front surface of the printed circuit board is located between the PFC circuit inductor and the dc filter circuit.

Optionally, the number of the inductors of the PFC circuit is multiple, and the number of the PFC power devices is multiple;

the plurality of PFC circuit inductors are arranged in columns, and the plurality of PFC power devices are arranged in columns;

and each PFC circuit inductor and the PFC power device connected with the PFC circuit inductor are arranged in a row.

Optionally, a heat sink is further disposed on the back of the printed circuit board, and the heat sink is disposed close to the PFC power device.

Optionally, the dc filter circuit includes a plurality of electrolytic capacitors, and the plurality of electrolytic capacitors are arranged in a column.

Optionally, a distance between the dc filter circuit and the inductor of the PFC circuit is greater than a distance between the EMC filter circuit and the inductor of the PFC circuit.

Optionally, the control module further includes a pre-charge circuit, and the pre-charge circuit is disposed between the EMC filter circuit and the PFC circuit.

Optionally, the pre-charge circuit is disposed close to the rectification circuit.

Optionally, the control module is disposed at one end of the printed circuit board, and the rectifying circuit is disposed near an end of the printed circuit board.

Optionally, a load module is disposed at the other end of the printed circuit board, and the load module is disposed adjacent to the control module.

Optionally, the load module includes a driving circuit, a switching power supply circuit, and a master control circuit.

Optionally, the EMC filter circuit, the rectifier circuit, the PFC circuit, and the dc filter circuit are electrically connected in sequence, and the dc filter circuit is connected to the load module.

In a second aspect, the present invention provides an electrical device, including:

the electrical apparatus comprises a housing and a blower arranged in the housing, at least part of a blowing surface of the blower facing the printed circuit board, and the printed circuit board according to the first aspect and various possible designs of the first aspect.

The utility model provides a printed circuit board and electrical equipment are provided with control module on this printed circuit board, and control module includes EMC filter circuit, PFC circuit, rectifier circuit and direct current filter circuit, and wherein, direct current filter circuit sets up in one side of printed circuit board, and EMC filter circuit sets up the opposite side at printed circuit board, PFC circuit and rectifier circuit set up at EMC filter circuit with between the direct current filter circuit. Through integrated one with a plurality of printed circuit board, reduced because of a plurality of printed circuit board reduce a plurality of printed circuit board and occupied the influence that great space caused to the domestic appliance miniaturization, improved the stability of printed circuit board in production and transportation to keep away from the setting as far as with the part that generates heat and the temperature sensitive part among the printed circuit board, reduce because of a plurality of printed circuit board integration back, the influence of the part that generates heat to whole circuit board job stabilization nature.

Drawings

Fig. 1 is a schematic structural diagram of an electrical apparatus provided by the present invention;

fig. 2 is a schematic structural diagram of a printed circuit board according to the present invention;

fig. 3 is a schematic structural diagram of a printed circuit board according to the present invention;

fig. 4 is a schematic structural diagram of a printed circuit board according to the present invention;

fig. 5 is a schematic structural diagram of a printed circuit board according to the present invention;

fig. 6 is a schematic structural diagram of a load module provided by the present invention;

fig. 7 is a schematic structural diagram of a printed circuit board according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the embodiment of the present invention, the words "first", "second", etc. are used to distinguish the same items or similar items with basically the same functions and actions, and the sequence is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

It should be noted that, in the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

Electric appliances such as air conditioners and swimming pool machines have gradually become essential household appliances in daily life of people, and the electric appliances realize corresponding functions by controlling the operation of corresponding motors or compressors through a control module integrated on a printed circuit board.

At present, a control module on a printed circuit board has a plurality of heat generating components, such as an electromagnetic compatibility filter circuit and a power factor correction circuit, and in order to ensure good heat dissipation of the printed circuit board, different heat generating components are usually disposed on different printed circuit boards, for example, the electromagnetic compatibility filter circuit is disposed on a single printed circuit board, the power factor correction circuit is disposed on another printed circuit board, and then the plurality of printed circuit boards are connected to form a control circuit board of a household appliance.

However, the household appliances have been gradually developed toward miniaturization, a plurality of printed circuit boards occupy a large space, which imposes a certain limitation on the miniaturization of the household appliances, and the combination of a plurality of printed circuit boards is also prone to a problem of instability during production and transportation.

In view of this, the embodiment of the utility model provides a printed circuit board and electrical equipment, a plurality of printed circuit board that will be used for controlling domestic appliance are integrated into one, can reduce a plurality of printed circuit board and occupy the influence that great space caused to domestic appliance miniaturization, improved the stability of printed circuit board in production and transportation to carry out reasonable overall arrangement to each control module on the printed circuit board through the mounted position that sets up printed circuit board, effectively reduced a plurality of printed circuit board integrated backs, the heat dissipation problem of bringing.

The technical solution of the present invention and how to solve the above technical problems will be described in detail with specific embodiments. The following embodiments may be implemented independently or in combination, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is a schematic structural diagram of an electrical apparatus provided in an embodiment of the present invention, including a housing 101, a fan 102, and a printed circuit board 103.

The housing 101 is a housing of an electrical device, and the fan 102 and the printed circuit board 103 are disposed inside the housing 101.

The printed circuit board 103 is disposed on the opposite side of the blower 102, including the side or the square.

When the electrical equipment works, the fan 102 may be controlled to rotate by the printed circuit board 103, please refer to fig. 1, when the fan 102 rotates, the fan may drive air in the electrical equipment to flow, and since the printed circuit board 103 is disposed at the opposite side of the fan 102, the air flow generated when the fan 102 rotates may flow through the surface of the printed circuit board 103, so that the heat generated when the printed circuit board 103 works may be taken away and exhausted through the exhaust hole on the housing 101. That is, part of the blowing surface of the blower 102 faces the printed circuit board 103.

The embodiment of the utility model provides an in electrical equipment can be the household electrical appliances commonly used such as air conditioner, swimming pool machine, the utility model discloses do not restrict to this.

The embodiment of the utility model provides an electrical equipment, including casing and printed circuit board and the fan of setting in the casing, the face orientation printed circuit board is bloied to at least part of fan. The air current that produces when rotating through the fan flows through printed circuit board's surface, can take away printed circuit board heat that the during operation produced, has reduced because of when a plurality of printed circuit board are integrated as one, and the produced heat of circuit board has promoted printed circuit board job stabilization nature to the influence of each part that sets up on the circuit board.

The above description explains the setting of printed circuit board in electrical equipment, the embodiment of the utility model provides a still through carrying out reasonable overall arrangement to each part in the printed circuit board, further reduced because of the influence of the part that generates heat to whole circuit board job stabilization nature.

The specific structure of the printed circuit board provided by the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 2 is the utility model provides a printed circuit board's structural schematic diagram one, as shown in fig. 2, be provided with control module on the printed circuit board 20, this control module includes: an electromagnetic compatibility (EMC) filter circuit 201, a rectifier circuit 202, a Power Factor Correction (PFC) circuit 203, and a dc filter circuit 204.

Wherein the dc filter circuit 204 is disposed on one side of the printed circuit board 20, the EMC filter circuit 201 is disposed on the other side of the printed circuit board 20, and the PFC circuit 203 and the rectifier circuit 202 are disposed between the EMC filter circuit 201 and the dc filter circuit 204.

The PFC circuit, the EMC filter circuit and the direct current filter circuit are arranged at intervals, and the rectifying circuit is arranged close to the PFC circuit.

Illustratively, as shown in fig. 2, the EMC filter circuit 201 is disposed at the leftmost side of the printed circuit board 20, the dc filter circuit 204 is disposed at the rightmost side of the printed circuit board 20, the PFC circuit 203 and the rectifier circuit 202 are respectively disposed between the EMC filter circuit 201 and the dc filter circuit 204, and the rectifier circuit 202 is disposed below the PFC circuit 203 and near the PFC circuit 203, i.e., a certain interval is disposed between the PFC circuit, the EMC filter circuit and the dc filter circuit.

The embodiment of the utility model provides an EMC filter circuit 201's input is connected with power supply, and EMC filter circuit 201's output is connected with rectifier circuit 202, and rectifier circuit 202 is connected with PFC circuit 203, and PFC circuit 203 is connected with direct current filter circuit 204.

When the power supply starts to be powered on, current flows from the power supply to the EMC filter circuit 201, the rectifier circuit 202, the PFC circuit 203, and the dc filter circuit 204 in sequence, and then flows from the dc filter circuit 204 to a compressor or a fan in the electrical equipment, so as to drive the compressor or the fan to operate.

The embodiment of the utility model provides an in, EMC filter circuit 201, including EMC filter circuit inductance and corresponding drive circuit for the alternating current that provides the power supply to the input carries out the filtering and follows the outside electromagnetic interference that the power cord introduced, avoids self to send the work of other electronic component under the same electromagnetic environment of noise interference influence to the outside simultaneously.

The rectifier circuit 202 includes a rectifier circuit inductor and a corresponding driving circuit, and is configured to perform dc conversion on the filtered ac power and perform boosting processing. For example, 220V ac is converted to 310V dc. Alternatively, the direct current may be a pulsating direct current.

The PFC circuit 203, including a PFC circuit inductor, a PFC power device and a corresponding driving circuit, is configured to increase a power factor of the circuit, where the power factor refers to a relationship between an effective power and a total power consumption (apparent power), that is, a ratio of the effective power divided by the total power consumption (apparent power). The power factor can measure the effective utilization degree of the power, and when the power factor value is larger, the power utilization rate is higher. That is, the PFC circuit 203 can improve the power utilization rate of the electric appliance.

Optionally, the PFC circuit 203 is further configured to boost and stabilize, for example, 310V dc input by the rectifier circuit 202 to 380V dc, and keep it stable.

The dc filter circuit 204, which includes a dc filter electrolytic capacitor and a corresponding driving circuit, is used to further filter the flowing pulsating dc power, and change the pulsating dc voltage into a smooth dc voltage, so as to meet the requirements of the rear-end electrical appliance.

The embodiment of the utility model provides an in, the circuit inductance in EMC filter circuit 201 and the circuit inductance in PFC circuit 203 are the part that generates heat, and electrolytic capacitor in direct current filter circuit 204 is temperature sensitive component, promptly, and electrolytic capacitor's in direct current filter circuit 204 reliability and life-span receive the influence of temperature easily, and when ambient temperature was higher, the problem that descends appears easily in reliability and life-span jun.

The embodiment of the utility model provides an in, to contain temperature sensing element's direct current filter circuit 204 sets up in one side of printed circuit board 20, will contain the EMC filter circuit 201 of the part that generates heat and set up at printed circuit board 20's opposite side, contains the PFC circuit 203 of the part that generates heat and sets up between EMC filter circuit 201 and direct current filter circuit 204, and PFC circuit, EMC filter circuit and direct current filter circuit interval set up. The direct current filter circuit 204 is arranged at a position as far away from the heating parts as possible, and a certain distance is left between the circuits of the two heating parts, so that the heat dissipation through air can be improved, and the influence of heating on the temperature sensitive element is reduced.

Fig. 3 is a schematic structural diagram of a printed circuit board according to an embodiment of the present invention, as shown in fig. 3, the control module further includes: a precharge circuit 205.

Wherein one end of the precharge circuit 205 is connected to the EMC filter circuit 201, the other end of the precharge circuit 205 is connected to the rectifier circuit 202, the precharge circuit 205 is provided between the EMC filter circuit 201 and the PFC circuit 203, and the precharge circuit 205 is provided near the rectifier circuit 202.

In the embodiment of the present invention, the pre-charging circuit 205 is used to protect the control module in the electrical appliance, for example, the electrolytic capacitor in the dc filter circuit 204. If the capacitor is in a zero state before the electric appliance is powered on, namely no energy exists in the capacitor, the current is very large at the moment of closing the circuit, namely, the direct short circuit is realized, and the large current can cause huge impact on the electric equipment and damage the electric equipment if the large current is not limited. The pre-charging circuit 205 in the embodiment of the present invention may be a commonly used pre-charging circuit, for example, composed of a relay and a Positive Temperature Coefficient (PTC) thermistor.

In the embodiment of the present invention, PFC circuit 203 includes PFC circuit inductance 2031 and PFC power device 2032, PFC circuit inductance 2031 is close to EMC filter circuit 201 and sets up, PFC power device 2032 is close to dc filter circuit 204 and sets up, and PFC power device 2032 sets up the back at printed circuit board 20.

The embodiment of the utility model provides an in PFC power device 2032 includes Insulated Gate Bipolar Transistor (IGBT) and diode, and the PFC circuit that corresponds includes IGBT drive circuit. The IGBT is a composite full-control voltage-driven power semiconductor device consisting of a bipolar triode and an insulated gate field effect transistor.

Referring to fig. 3, since the current in the PFC circuit 203 flows through the PFC circuit inductor 2031 and then flows into the PFC power device 2032, the PFC power device 2032 can be determined on the printed circuit board 20 according to the position of the PFC circuit inductor 2031.

Specifically, the projection of the PFC power device 2032 on the front side of the printed circuit board 20 is located between the PFC circuit inductor 2031 and the dc filter circuit 204.

Optionally, the PFC power device 2032 is also a heat generating component, and therefore, a heat sink is further disposed on the back side of the printed circuit board 20, and the heat sink is close to the PFC power device 2032. For example, the heat sink may be disposed closely to the PFC power device 2032, and the relative position between the heat sink and the PFC power device 2032 may be determined according to the actual route of the printed circuit board 20, which is not limited by the embodiment of the present invention.

In the embodiment of the present invention, because the electrolytic capacitor in the dc filter circuit 204 is a temperature sensitive element, the PFC circuit inductance 2031 in the PFC circuit 203 is a heat generating component, therefore, it is necessary to increase the distance between the electrolytic capacitor in the PFC circuit inductance 2031 and the dc filter circuit 204 as much as possible on the basis that the capacitor in the PFC circuit inductance 2031 and the EMC filter circuit 201 of the heat generating component is ensured to have a certain interval, that is, the distance between the dc filter circuit 204 and the PFC circuit inductance 2031 is greater than the distance between the EMC filter circuit 201 and the PFC circuit inductance 2031.

It can be understood that, concrete distance setting can be according to the decision that actual circuit went to, the embodiment of the utility model provides a do not limit this, as long as guarantee that the interval between direct current filter circuit and the PFC circuit inductance is greater than the interval between EMC filter circuit and the PFC circuit inductance can.

The embodiment of the present invention provides an embodiment, the quantity of the PFC circuit inductance 2031 and the PFC power device 2032 in the PFC circuit 203 can be determined according to the power of the electrical equipment, the larger the power is, the more the quantity of the PFC circuit inductance 2031 and the PFC power device 2032 in the PFC circuit 203 is.

Specifically, there may be a plurality of PFC circuit inductors 2031 in the PFC circuit 203 and a plurality of PFC power devices 2032 in the PFC circuit 203, as shown in fig. 4, each circle represents one PFC circuit inductor or PFC power device.

The plurality of PFC circuit inductors 2031 are arranged in columns, and the plurality of PFC power devices 2032 are arranged in columns, and each PFC circuit inductor 2031 corresponds to one PFC power device 2032. That is, the PFC circuit 20 may include multiple components, and each component includes one PFC circuit inductor 2031 and one PFC power device 2032.

Optionally, each power device corresponds to one heat sink, and the plurality of heat sinks are also arranged in a column.

Optionally, the number of the heat sinks may also be 1, and the heat sinks are disposed near the middle of the plurality of PFC power devices 2032, that is, disposed close to the central one of the plurality of PFC power devices 2032 arranged in a column. For example, there are 3 PFC power devices 2032, which are arranged from top to bottom, and the heat sink is disposed closely to the second PFC power device.

In the embodiment of the present invention, the capacitance in the EMC filter circuit 201 and the electrolytic capacitance in the dc filter circuit 204 can also be set according to the power of the electrical equipment.

Specifically, one or more capacitors may be disposed in the EMC filter circuit 201, and one or more electrolytic capacitors may be disposed in the dc filter circuit 204.

With continued reference to FIG. 4, the capacitors in the EMC filter circuit 201 are arranged in columns and the electrolytic capacitors in the DC filter circuit 204 are also arranged in columns.

It is understood that the number of circles in fig. 4 does not limit the specific EMC filter circuit capacitance and the dc filter circuit electrolytic capacitance, and may be set according to actual requirements.

The embodiment of the utility model provides an in, with the PFC power device setting in the PFC circuit at printed circuit board's back, every PFC power device all is provided with a radiator, and PFC circuit inductance sets up between direct current filter circuit and EMC filter circuit, and the interval between direct current filter circuit and the PFC circuit inductance is greater than the interval between EMC filter circuit and the PFC circuit inductance. By increasing the distance between the temperature sensitive element and the heating device, the influence of the heating of the device on the reliability of the temperature sensitive element can be reduced.

Fig. 5 is a fourth schematic diagram of the printed circuit board provided by the embodiment of the present invention, as shown in fig. 5, the embodiment of the present invention provides a printed circuit board 20 further including: a load module 206.

Wherein the load module 206 is disposed at one end of the printed circuit board 20 adjacent to the control module. One end of the load module 206 is connected to the control module, and the other end of the load module 206 is connected to a compressor or a motor of the electrical equipment.

In the embodiment of the present invention, the load module 206 is used for controlling the electrical equipment to operate according to the energy provided by the control module and the control instruction of the user.

Fig. 6 is a schematic structural diagram of the load module 206 provided by the embodiment of the present invention, as shown in fig. 6, the embodiment of the present invention provides a load module 206 including a driving circuit 2061, a switching power supply circuit 2062 and a master control circuit 2063.

The driving circuit 2061 is connected to the switching power supply circuit 2062, the main control circuit 2063, and the compressor or the motor of the electrical apparatus, the switching power supply circuit 2062 is connected to the driving circuit 2061 and the main control circuit 2063, and the main control circuit 2063 is connected to the driving circuit 2061 and the switching power supply circuit 2062.

The driving circuit 2061 is used to drive a compressor or a motor of an electrical apparatus to operate, the switching power supply circuit 2062 is used to provide low-voltage power support, for example, 5V and/or 12V, for the driving circuit 2061 and the main control circuit 2063 to ensure that the driving circuit 2061 and the main control circuit 2063 operate normally, and the main control circuit 2063 is used to provide control signal support for the driving circuit 2061, that is, the main control circuit 2063 converts a control command of a user into a control signal and provides the control signal to the driving circuit 2061, so that the driving circuit 2061 controls the operation of the compressor or the motor according to the control signal.

Optionally, the driving circuit 2061 includes a first driving circuit and a second driving circuit, the first driving circuit and the second driving circuit are independent from each other, the first driving circuit is configured to provide electric energy for the compressor or the motor to drive the compressor or the motor to operate, and the second driving circuit is configured to provide an operation mode for the compressor or the motor. That is, the first driving circuit is used to control the operation of the compressor or the motor, and the second driving circuit is used to control the operation manner of the compressor or the motor, such as the rotation direction, the rotation speed, and the like.

The driving circuit 2061 includes a first driving circuit and a second driving circuit, the switching power supply circuit 2062 is connected to the first driving circuit and the second driving circuit, and the main control circuit 2063 is also connected to the first driving circuit and the second driving circuit.

Optionally, the main control circuit 2063 is further connected to the PFC circuit 203 in the control module, and is configured to control an IGBT and a diode in the PFC circuit 203 according to the control signal, so that the PFC circuit 203 corrects the power factor of the whole circuit.

Fig. 7 is a schematic structural diagram of a printed circuit board according to an embodiment of the present invention, as shown in fig. 7, including a control module and a load module.

The specific structure, connection relationship and function of the control module and the load module have been described by the embodiments shown in fig. 2 to 6, and are not described herein again.

To sum up, the embodiment of the utility model provides a will originally a plurality of printed circuit board assemble into one, reduced because of a plurality of printed circuit board reduce a plurality of printed circuit board and occupied the influence that great space caused to the domestic appliance miniaturization, improved the stability of printed circuit board in production and transportation, and keep away from the setting and make the part of fan face of blowing towards printed circuit board with the part that generates heat in the printed circuit board and the temperature sensitive part as far as, reduced because of a plurality of printed circuit board integration backs, the part that generates heat is to whole circuit board job stabilization nature's influence.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (15)

1. A printed circuit board is characterized in that a control module is arranged on the printed circuit board, the control module comprises an EMC filter circuit, a PFC circuit, a rectification circuit and a direct current filter circuit, wherein,

the direct current filter circuit is arranged on one side of the printed circuit board, the EMC filter circuit is arranged on the other side of the printed circuit board, and the PFC circuit and the rectification circuit are arranged between the EMC filter circuit and the direct current filter circuit.

2. The printed circuit board of claim 1, wherein the PFC circuit, the EMC filter circuit, and the DC filter circuit are spaced apart, and the rectifier circuit is disposed proximate to the PFC circuit.

3. The printed circuit board of claim 1, wherein the PFC circuit comprises a PFC circuit inductor and a PFC power device, wherein

The PFC circuit inductance is arranged close to the EMC filter circuit;

the PFC power device is arranged close to the direct current filter circuit and is arranged on the back face of the printed circuit board.

4. The printed circuit board of claim 3, wherein the PFC power device's projection onto the front side of the printed circuit board is located between the PFC circuit inductance and the DC filter circuit.

5. The printed circuit board of claim 3, wherein the PFC circuit inductance is plural, and the PFC power device is plural;

the plurality of PFC circuit inductors are arranged in columns, and the plurality of PFC power devices are arranged in columns;

and each PFC circuit inductor and the PFC power device connected with the PFC circuit inductor are arranged in a row.

6. The printed circuit board of claim 3, wherein a heat sink is further disposed on the back side of the printed circuit board, the heat sink being disposed proximate to the PFC power device.

7. The printed circuit board of claim 1, wherein the dc filter circuit comprises a plurality of electrolytic capacitors, the plurality of electrolytic capacitors being arranged in a column.

8. The printed circuit board of claim 1, wherein a spacing between the dc filter circuit and the PFC circuit inductance is greater than a spacing between the EMC filter circuit and the PFC circuit inductance.

9. The printed circuit board of claim 8, wherein the control module further comprises a pre-charge circuit disposed between the EMC filter circuit and the PFC circuit.

10. The printed circuit board of claim 9, wherein the pre-charge circuit is disposed proximate to the rectifier circuit.

11. The printed circuit board of claim 1, wherein the control module is disposed at an end of the printed circuit board and the rectifying circuit is disposed proximate the end of the printed circuit board.

12. The printed circuit board of claim 11, wherein the other end of the printed circuit board is provided with a load module, the load module being disposed adjacent to the control module.

13. The printed circuit board of claim 12, wherein the load module comprises a driver circuit, a switching power supply circuit, and a master control circuit.

14. The printed circuit board of claim 12, wherein the EMC filter circuit, the rectifier circuit, the PFC circuit, and the dc filter circuit are electrically connected in sequence, and the dc filter circuit is connected to the load module.

15. An electrical device, characterized in that the electrical device comprises a housing and a fan arranged in the housing, at least part of a blowing surface of the fan facing the printed circuit board, and the printed circuit board as claimed in any one of claims 1 to 14.

Images