Exhaust fan of fully-integrated direct-current brushless motor

Abstract

The utility model discloses a fully integrated direct current brushless motor's exhaust fan, including PCB board, fan blade, the PCB board is provided with AC rectifier filter circuit, AC-DC power supply circuit, motor control circuit, motor drive circuit, MCU power supply circuit, AC rectifier filter circuit is connected with AC-DC power supply circuit, motor drive circuit is connected with MCU power supply circuit, MCU power supply circuit is connected with MCU power supply circuit. The AC rectification filter circuit is used for converting an AC electric signal into a DC electric signal and inputting the DC electric signal into the AC-DC power supply circuit, the motor control circuit is electrically connected with the AC-DC power supply circuit, the motor driving circuit and the MCU power supply circuit, and the motor driving circuit is used for driving the motor control circuit. The AC-DC power supply circuit and the MCU power supply circuit are used for supplying power to the motor control circuit, and the motor control circuit is used for driving the fan blades to work. According to the utility model, the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current brushless motors, in particular to an exhaust fan of a fully integrated direct current brushless motor. Background Art

[0002] A brushless DC motor (BLDC Motor) is a motor that uses electronic commutation technology to achieve rotor rotation. Unlike traditional brushed DC motors, brushless DC motors use built-in sensors or external controllers to achieve motor commutation, thereby achieving motor rotor rotation.

[0003] Most of the existing exhaust fans still use the traditional DC brushless motor solution. The general motor drive board is composed of two PCB boards: a motor control board and a motor power board. The motor power supply part adopts an isolation solution, which is costly. Utility Model Content

[0004] The main purpose of the utility model is to provide an exhaust fan with a fully integrated DC brushless motor, aiming to reduce the manufacturing cost of the exhaust fan.

[0005] To achieve the above-mentioned purpose, the utility model proposes an exhaust fan of a fully integrated DC brushless motor, including a PCB board and fan blades. The PCB board is provided with an AC rectifier and filter circuit, an AC-DC power supply circuit, a motor control circuit, a motor drive circuit, and an MCU power supply circuit. The AC rectifier and filter circuit is connected to the AC-DC power supply circuit. The AC rectifier and filter circuit is used to convert an AC power signal into a DC power signal and input the DC power signal into the AC-DC power supply circuit. The motor control circuit is electrically connected to the AC-DC power supply circuit, the motor drive circuit, and the MCU power supply circuit. The motor drive circuit is used to drive the motor control circuit. The AC-DC power supply circuit and the MCU power supply circuit are used to power the motor control circuit. The motor control circuit is used to drive the fan blades to work.

[0006] In one embodiment, the exhaust fan further includes a shell, the shell is connected to the PCB board and the fan blades, and the shell is used to fix the PCB board and the fan blades.

[0007] In one embodiment, the AC rectifier and filter circuit includes a live wire, a neutral wire, a fuse, a transformer, and a rectifier bridge. The live wire is connected to the fuse, and the transformer is connected to the neutral wire and the rectifier bridge.

[0008] In one embodiment, the AC rectifier and filter circuit further includes a first capacitor, a second capacitor, and a first inductor. The first capacitor, the second capacitor, and the first inductor are electrically connected to the rectifier bridge, and the first capacitor is connected in parallel with the second capacitor.

[0009] In one embodiment, the first capacitor and the second capacitor are electrolytic capacitors.

[0010] In one embodiment, the exhaust fan further includes a Mylar sheet, and the Mylar sheet is located on one side of the PCB board.

[0011] In one embodiment, the exhaust fan further includes a connecting shaft, and the connecting shaft passes through the Mylar sheet and the PCB board.

[0012] In one embodiment, the exhaust fan is connected to a three-phase line, and the motor drive circuit includes a first switch tube, a second switch tube, and a third switch tube, and the first switch tube, the second switch tube, and the third switch tube are connected to the three-phase line.

[0013] The utility model reduces the number of PCB boards separately provided for the motor power supply and reduces the cost by fully integrating the AC rectifier and filter circuit, AC-DC power supply circuit, motor control circuit, motor drive circuit and MCU power supply circuit on the PCB board, and provides a stable input signal by using the AC rectifier and filter circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0015] Figure 1 The module schematic diagram of the exhaust fan with fully integrated brushless DC motor;

[0016] Figure 2 It is the circuit schematic diagram of AC rectifier filter circuit and AC-DC power supply circuit;

[0017] Figure 3 Power supply circuit diagram for MCU;

[0018] Figure 4 This is the motor drive circuit diagram;

[0019] Figure 5 This is the motor control circuit diagram.

[0020] Description of Figure Numbers:

[0021] 1-AC rectifier and filter circuit, 2-AC-DC power supply circuit, 3-motor control circuit, 4-fan blades, 5-motor drive circuit, 6-MCU power supply circuit, 7-housing.

[0022] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0026] The utility model proposes an exhaust fan of a fully integrated DC brushless motor, comprising a PCB board and fan blades 4. An AC rectifier and filter circuit 1, an AC-DC power supply circuit 2, a motor control circuit 3, a motor drive circuit 5, and an MCU power supply circuit 6 are arranged on the PCB board. The AC rectifier and filter circuit 1 is connected to the AC-DC power supply circuit 2. The AC rectifier and filter circuit 1 is used to convert an AC power signal into a DC power signal and input the DC power signal into the AC-DC power supply circuit 2. The motor control circuit 3 is electrically connected to the AC-DC power supply circuit 2, the motor drive circuit 5, and the MCU power supply circuit 6. The motor drive circuit 5 is used to drive the motor control circuit 3. The AC-DC power supply circuit 2 and the MCU power supply circuit 6 are used to supply power to the motor control circuit 3. The motor control circuit 3 is used to drive the fan blades 4 to work.

[0027] In the embodiment of the present utility model, Figure 1 , Figure 3 and Figure 5 As shown, the exhaust fan of the fully integrated DC brushless motor adopts the fully integrated AC rectifier and filter circuit 1, AC-DC power supply circuit 2, motor control circuit 3, motor drive circuit 5, and MCU power supply circuit 6 on the PCB board, thereby reducing the PCB board set up separately for the motor power supply, reducing the cost, and also reducing the volume of the exhaust fan. The AC rectifier and filter circuit 1 provides a smooth input signal. This embodiment is a non-isolated power supply solution. The AC-DC power supply circuit 2 outputs a constant voltage to power the MCU power supply circuit 6 and the motor drive circuit 5. The motor control circuit 3 realizes the speed control of the motor by controlling the duty cycle of the motor drive circuit 5.

[0028] The exhaust fan further comprises a shell 7, wherein the shell 7 is connected to the PCB board and the fan blades 4, and the shell 7 is used to fix the PCB board and the fan blades 4. The shell 7 can well protect the PCB board.

[0029] like Figure 2 As shown, the AC rectifier filter circuit 1 includes a live wire L, a neutral wire N, a fuse F1, a transformer LF1, and a rectifier bridge BD1. The live wire L is connected to the fuse F1, and the transformer LF1 is connected to the neutral wire N and the rectifier bridge BD1. The transformer LF1 converts the AC signal at the input end into the voltage required by the output end through the principle of electromagnetic induction. The transformer LF1 can increase or decrease the voltage so that the power can be transmitted and used under different voltages; when the AC power is passed into the input end, the iron core inside the transformer LF1 will cause the generation of a magnetic field, so that the input end coil generates an induced electromotive force, and then generates a corresponding voltage at the output end. Through the transformation ratio of the transformer LF1, the corresponding relationship between the output end voltage and the input end voltage can be achieved. In this way, the transformer LF1 is widely used in power transmission, distribution and various electronic equipment, and plays a role in regulating voltage, improving power utilization and protecting equipment. The rectifier bridge BD1 is an electronic component used to convert AC signals into DC signals. In the rectifier bridge BD1, it is usually composed of four diodes, which can allow the negative half cycle and the positive half cycle of the AC signal to pass respectively, thereby converting the AC signal into a unidirectional DC signal.

[0030] The rectifier bridge BD1 outputs the input AC signal as a DC signal with the same direction after passing through the rectifier bridge BD1.

[0031] The AC rectifier and filter circuit 1 also includes a first capacitor EC1, a second capacitor EC2, and a first inductor L1. The first capacitor EC1, the second capacitor EC2, and the first inductor L1 are electrically connected to the rectifier bridge BD1, and the first capacitor EC1 is connected in parallel with the second capacitor EC2. The first capacitor EC1 and the second capacitor EC2 are electrolytic capacitors. The first capacitor EC1 and the second capacitor EC2 are used to filter and remove stray fluctuations or high-frequency noise in the signal. By appropriately selecting the value of the capacitor, the signal can be filtered, making the output signal more stable and pure.

[0032] The exhaust fan further includes a Mylar sheet, which is located on one side of the PCB board. The exhaust fan further includes a connecting shaft, which passes through the Mylar sheet and the PCB board. The Mylar sheet is an insulating material, the motor is connected to the connecting shaft, and the connecting shaft is also connected to the fan blade 4. The motor drives the connecting shaft to rotate, and the connecting shaft drives the fan blade 4 to rotate.

[0033] like Figure 4 As shown, the exhaust fan is connected to the three-phase line, and the motor drive circuit 5 includes a first switch tube Q1, a second switch tube Q2, and a third switch tube Q3. The first switch tube Q1, the second switch tube Q2, and the third switch tube Q3 are connected to the three-phase line. By controlling the on and off states of the first switch tube Q1, the second switch tube Q2, and the third switch tube Q3, it is possible to control whether the current in the circuit is flowing, thereby realizing switch control of the entire circuit.

[0034] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fully integrated brushless DC motor exhaust fan, characterized in that: It includes a PCB board and fan blades. The PCB board is provided with an AC rectifier and filter circuit, an AC-DC power supply circuit, a motor control circuit, a motor drive circuit, and an MCU power supply circuit. The AC rectifier and filter circuit is connected to the AC-DC power supply circuit. The AC rectifier and filter circuit is used to convert an AC power signal into a DC power signal and input the DC power signal into the AC-DC power supply circuit. The motor control circuit is electrically connected to the AC-DC power supply circuit, the motor drive circuit, and the MCU power supply circuit. The motor drive circuit is used to drive the motor control circuit. The AC-DC power supply circuit and the MCU power supply circuit are used to power the motor control circuit. The motor control circuit is used to drive the fan blades to work.

2. The exhaust fan according to claim 1, characterized in that: The exhaust fan also includes a shell, which is connected to the PCB board and the fan blades, and is used to fix the PCB board and the fan blades.

3. The exhaust fan according to claim 1, characterized in that: The AC rectifier and filter circuit comprises a live wire, a neutral wire, a fuse, a transformer, and a rectifier bridge. The live wire is connected to the fuse, and the transformer is connected to the neutral wire and the rectifier bridge.

4. The exhaust fan according to claim 3, characterized in that: The AC rectifier and filter circuit further includes a first capacitor, a second capacitor, and a first inductor. The first capacitor, the second capacitor, and the first inductor are electrically connected to the rectifier bridge, and the first capacitor is connected in parallel with the second capacitor.

5. The exhaust fan according to claim 4, characterized in that: The first capacitor and the second capacitor are electrolytic capacitors.

6. The exhaust fan according to claim 1, characterized in that: The exhaust fan further comprises a Mylar sheet, and the Mylar sheet is located at one side of the PCB board.

7. The exhaust fan according to claim 6, characterized in that The exhaust fan also includes a connecting shaft, and the connecting shaft passes through the Mylar sheet and the PCB board.

8. The exhaust fan according to claim 1, characterized in that The exhaust fan is connected to a three-phase line, and the motor drive circuit includes a first switch tube, a second switch tube, and a third switch tube, and the first switch tube, the second switch tube, and the third switch tube are connected to the three-phase line.

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