Control circuit of direct current brushless variable frequency motor for table type range hood

Abstract

The utility model discloses a control circuit of a direct current brushless variable frequency motor for a table type range hood, which comprises a main control circuit, an interface circuit, a driving circuit, a rotating speed feedback circuit and a speed regulation circuit, and is characterized in that the interface circuit, the driving circuit, the rotating speed feedback circuit and the speed regulation circuit are respectively and electrically connected with the main control circuit; and the speed regulation circuit and the rotating speed feedback circuit are electrically connected with the interface circuit respectively. According to the control circuit of the direct current brushless variable frequency motor for the table type range hood, the main control circuit, the interface circuit, the driving circuit, the rotating speed feedback circuit and the speed regulation circuit are linked to drive the direct current brushless variable frequency motor, and the control circuit has the advantages of low noise, high efficiency, stable starting, large air volume, low maintenance cost and the like; and the use effect of the range hood is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of direct current brushless variable frequency motor control, and in particular relates to a control circuit of a direct current brushless variable frequency motor for a desktop range hood. Background Art

[0002] With the improvement of the quality of life, tabletop range hoods are increasingly used in home kitchens. However, traditional range hood motor control methods often have problems such as high energy consumption, high noise, and low control accuracy. Therefore, developing an efficient, energy-saving, and low-noise motor control device is of great significance for improving the performance of tabletop range hoods. Utility Model Content

[0003] The main purpose of the utility model is to provide a control circuit for a DC brushless frequency conversion motor for a desktop range hood, which drives the DC brushless frequency conversion motor through linkage among a main control circuit, an interface circuit, a drive circuit, a speed feedback circuit and a speed regulation circuit. The utility model has the advantages of low noise, high efficiency, smooth start-up, large air volume, low maintenance cost, etc., and effectively improves the use effect of the range hood.

[0004] Another object of the utility model is to provide a control circuit for a brushless DC variable frequency motor for a desktop range hood, which accurately controls the motor through a control chip, thereby achieving smooth starting, precise speed control and optimal power operation of the motor, and further improving the performance of the range hood.

[0005] Another object of the utility model is to provide a control circuit for a brushless DC variable frequency motor for a desktop range hood, which provides real-time feedback on the motor's operating status through current detection and speed detection, so that the control chip can adjust the control instructions according to actual conditions, thereby improving the accuracy and flexibility of the control.

[0006] In order to achieve the above purpose, the utility model provides a control circuit of a brushless DC variable frequency motor for a tabletop range hood, comprising a main control circuit, an interface circuit (connected to a control terminal for obtaining speed control instructions, etc.), a drive circuit (drives MOSFET to drive the motor), a speed feedback circuit and a speed control circuit, wherein the interface circuit, the drive circuit, the speed feedback circuit and the speed control circuit are electrically connected to the main control circuit, respectively, and the speed control circuit and the speed feedback circuit are electrically connected to the interface circuit, respectively, wherein:

[0007] The main control circuit includes a control chip U1, and the drive circuit includes a transistor Q1, a transistor Q2, and a transistor Q3, wherein the input ends of the transistor Q1, the transistor Q2, and the transistor Q3 are electrically connected to the control chip U1 respectively, and the output ends of the transistor Q1, the transistor Q2, and the transistor Q3 are connected to a brushless DC variable frequency motor (UVW three-phase) respectively;

[0008] The interface circuit includes a connection terminal P1, the speed feedback circuit includes a resistor R20 and a resistor R19, the common terminal of the resistor R20 and the resistor R19 is electrically connected to the speed feedback terminal (pin 7) of the control chip U1, the end of the resistor R19 away from the resistor R20 is connected to the power supply terminal (VDD5) and the end of the resistor R20 away from the resistor R19 is connected to the first end of the connection terminal P1 (pin 1, used to obtain a speed command);

[0009] The speed control circuit includes a diode D2 and a resistor R15, wherein the resistor R15 is connected to the anode of the diode D5 and the cathode of the diode D5 is connected to the third end (pin 3) of the connection end P1 and the end of the resistor R15 away from the diode D2 is connected to the speed control end (pin 8) of the control chip U1.

[0010] As a further preferred technical solution of the above technical solution, the first path of pin 1 of the transistor Q1 is electrically connected to pin 12 of the control chip U1 through a resistor R4, the second path of pin 1 of the transistor Q1 is electrically connected to pin 17 of the control chip U1 through a resistor R9, the third path of pin 1 of the transistor Q1 is electrically connected to pin 20 of the control chip U1 through a resistor R21, the pin 2 of the transistor Q1 is electrically connected to pin 2 of the control chip U1 through a resistor R1, and the pin 4 of the transistor Q1 is electrically connected to pin 5 of the control chip U1 through a resistor R1;

[0011] Pin 1 of the transistor Q2 is electrically connected to pin 13 of the control chip U1 through a resistor R5, pin 2 of the transistor Q2 is electrically connected to pin 1 of the control chip U1 through a resistor R5, and pin 4 of the transistor Q2 is electrically connected to pin 4 of the control chip U1 through a resistor R5;

[0012] Pin 1 of the transistor Q3 is electrically connected to pin 16 of the control chip U1 through resistor R10, pin 2 of the transistor Q3 is electrically connected to pin 24 of the control chip U1 through resistor R12, and pin 4 of the transistor Q3 is electrically connected to pin 3 of the control chip U1 through resistor R13.

[0013] As a further preferred technical solution of the above technical solution, a resistor RS1 and a resistor RS2 are connected in parallel between the pin 1 of the transistor Q1 and the pin 1 of the transistor Q2;

[0014] A resistor RS3 and a resistor RS4 are connected in parallel between the pin 1 of the transistor Q1 and the pin 1 of the transistor Q3;

[0015] Pin 1 of the transistor Q1 is also electrically connected to pin 19 of the control chip U1 through resistors RS6 and R11. Both ends of the resistor RS6 are connected in parallel with resistor RS5, and one end of the resistor RS6 away from the transistor Q1 is grounded.

[0016] As a further preferred technical solution of the above technical solution, the two ends of the resistor RS2 are further connected in parallel with a capacitor C5, the two ends of the resistor RS3 are further connected in parallel with a capacitor C10, and the two ends of the resistor RS5 are further connected in parallel with a capacitor C9.

[0017] As a further preferred technical solution of the above technical solution, it also includes a zero-crossing detection circuit, and the zero-crossing detection circuit includes a resistor R22, a resistor R23 and a resistor R24, wherein:

[0018] One end of the resistor R22 is connected to the U phase interface and the other end of the resistor R22 is connected to the 18 pin of the control chip U1;

[0019] One end of the resistor R23 is connected to the V phase interface and the other end of the resistor R23 is connected to the 15 pin of the control chip U1;

[0020] One end of the resistor R24 ​​is connected to the W phase interface and the other end of the resistor R24 ​​is connected to the 14th pin of the control chip U1. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model discloses a main control circuit diagram of a control circuit of a brushless DC variable frequency motor for a tabletop range hood.

[0022] Figure 2 The utility model discloses an interface circuit diagram of a control circuit of a brushless DC variable frequency motor for a tabletop range hood.

[0023] Figure 3 The utility model discloses a driving circuit diagram of a control circuit of a DC brushless frequency conversion motor for a desktop range hood.

[0024] Figure 4 The utility model discloses a speed feedback circuit diagram of a control circuit of a brushless DC variable frequency motor for a tabletop range hood.

[0025] Figure 5 The utility model discloses a speed regulating circuit diagram of a control circuit of a DC brushless frequency conversion motor for a desktop range hood.

[0026] Figure 6 The utility model discloses a zero-crossing detection circuit diagram of a control circuit of a DC brushless frequency conversion motor for a desktop range hood. DETAILED DESCRIPTION

[0027] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0028] The utility model discloses a control circuit of a brushless DC variable frequency motor for a tabletop range hood. The specific embodiments of the utility model are further described below in conjunction with preferred embodiments.

[0029] In the embodiments of the present invention, those skilled in the art will note that the brushless DC variable frequency motor and the like involved in the present invention may be regarded as prior art.

[0030] Preferred embodiments.

[0031] like Figure 1-6 As shown, the utility model discloses a control circuit of a brushless DC variable frequency motor for a desktop range hood, comprising a main control circuit, an interface circuit (connected to a control terminal for obtaining a speed control instruction, etc.), a drive circuit (drives MOSFET to drive the motor), a speed feedback circuit and a speed control circuit, wherein the interface circuit, the drive circuit, the speed feedback circuit and the speed control circuit are electrically connected to the main control circuit, respectively, and the speed control circuit and the speed feedback circuit are electrically connected to the interface circuit, respectively, wherein:

[0032] The main control circuit includes a control chip U1, and the drive circuit includes a transistor Q1, a transistor Q2, and a transistor Q3, wherein the input ends of the transistor Q1, the transistor Q2, and the transistor Q3 are electrically connected to the control chip U1 respectively, and the output ends of the transistor Q1, the transistor Q2, and the transistor Q3 are connected to a brushless DC variable frequency motor (UVW three-phase) respectively;

[0033] The interface circuit includes a connection terminal P1, the speed feedback circuit includes a resistor R20 and a resistor R19, the common terminal of the resistor R20 and the resistor R19 is electrically connected to the speed feedback terminal (pin 7) of the control chip U1, the end of the resistor R19 away from the resistor R20 is connected to the power supply terminal (VDD5) and the end of the resistor R20 away from the resistor R19 is connected to the first end of the connection terminal P1 (pin 1, used to obtain a speed command);

[0034] The speed control circuit includes a diode D2 and a resistor R15, wherein the resistor R15 is connected to the anode of the diode D5 and the cathode of the diode D5 is connected to the third end (pin 3) of the connection end P1 and the end of the resistor R15 away from the diode D2 is connected to the speed control end (pin 8) of the control chip U1.

[0035] Specifically, the first path of pin 1 of the transistor Q1 is electrically connected to pin 12 of the control chip U1 through a resistor R4, the second path of pin 1 of the transistor Q1 is electrically connected to pin 17 of the control chip U1 through a resistor R9, the third path of pin 1 of the transistor Q1 is electrically connected to pin 20 of the control chip U1 through a resistor R21, the pin 2 of the transistor Q1 is electrically connected to pin 2 of the control chip U1 through a resistor R1, and the pin 4 of the transistor Q1 is electrically connected to pin 5 of the control chip U1 through a resistor R1;

[0036] Pin 1 of the transistor Q2 is electrically connected to pin 13 of the control chip U1 through a resistor R5, pin 2 of the transistor Q2 is electrically connected to pin 1 of the control chip U1 through a resistor R5, and pin 4 of the transistor Q2 is electrically connected to pin 4 of the control chip U1 through a resistor R5;

[0037] Pin 1 of the transistor Q3 is electrically connected to pin 16 of the control chip U1 through resistor R10, pin 2 of the transistor Q3 is electrically connected to pin 24 of the control chip U1 through resistor R12, and pin 4 of the transistor Q3 is electrically connected to pin 3 of the control chip U1 through resistor R13.

[0038] More specifically, a resistor RS1 and a resistor RS2 are connected in parallel between the pin 1 of the transistor Q1 and the pin 1 of the transistor Q2;

[0039] A resistor RS3 and a resistor RS4 are connected in parallel between the pin 1 of the transistor Q1 and the pin 1 of the transistor Q3;

[0040] Pin 1 of the transistor Q1 is also electrically connected to pin 19 of the control chip U1 through resistors RS6 and R11. Both ends of the resistor RS6 are connected in parallel with resistor RS5, and one end of the resistor RS6 away from the transistor Q1 is grounded.

[0041] Furthermore, the two ends of the resistor RS2 are connected in parallel with a capacitor C5, the two ends of the resistor RS3 are connected in parallel with a capacitor C10, and the two ends of the resistor RS5 are connected in parallel with a capacitor C9.

[0042] Furthermore, a zero-crossing detection circuit is also included, and the zero-crossing detection circuit includes a resistor R22, a resistor R23 and a resistor R24, wherein:

[0043] One end of the resistor R22 is connected to the U phase interface and the other end of the resistor R22 is connected to the 18 pin of the control chip U1;

[0044] One end of the resistor R23 is connected to the V phase interface and the other end of the resistor R23 is connected to the 15 pin of the control chip U1;

[0045] One end of the resistor R24 ​​is connected to the W phase interface and the other end of the resistor R24 ​​is connected to the 14th pin of the control chip U1.

[0046] For this utility model:

[0047] The control chip U1 receives the control signal input by the user interruption through the interface circuit, generates corresponding control instructions according to the control signal and the information fed back by the current detection circuit and the speed detection circuit, and drives the DC brushless variable frequency motor to operate through the drive circuit;

[0048] In the start-up control stage, the control chip U1 controls the motor start-up acceleration to be smooth by controlling the drive circuit, eliminates the interference factor of reverse bias on the motor during startup, and makes the DC brushless variable frequency motor start smoothly; in the speed control stage, the control chip U1 adjusts the control instruction according to the motor speed information fed back by the speed feedback circuit, and uses the PWM speed regulation method to control the motor speed during operation, so as to control the air volume and make the motor run at the target speed; in the power control stage, the control chip U1 adjusts the control instruction according to the motor current information fed back by the current detection circuit (composed of resistors RS1-RS6), so that the motor runs at the optimal power state;

[0049] The ground wire of the utility model is isolated and connected to the motor housing, which greatly improves the anti-static level, the maximum withstand voltage can reach 8kV, and the insulation withstand voltage level and safety reliability are improved.

[0050] It is worth mentioning that the technical features such as the DC brushless variable frequency motor involved in this utility model patent application should be regarded as the prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional methods in the field, and should not be regarded as the invention point of this utility model patent. This utility model patent will not be further elaborated.

[0051] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A control circuit for a brushless DC variable frequency motor for a tabletop range hood, characterized in that: The invention comprises a main control circuit, an interface circuit, a drive circuit, a speed feedback circuit and a speed regulation circuit, wherein the interface circuit, the drive circuit, the speed feedback circuit and the speed regulation circuit are electrically connected to the main control circuit respectively, and the speed regulation circuit and the speed feedback circuit are electrically connected to the interface circuit respectively, wherein: The main control circuit includes a control chip U1, and the drive circuit includes a transistor Q1, a transistor Q2, and a transistor Q3, wherein the input ends of the transistor Q1, the transistor Q2, and the transistor Q3 are electrically connected to the control chip U1 respectively, and the output ends of the transistor Q1, the transistor Q2, and the transistor Q3 are connected to the brushless DC variable frequency motor respectively; The interface circuit includes a connection terminal P1, the speed feedback circuit includes a resistor R20 and a resistor R19, the common terminal of the resistor R20 and the resistor R19 is electrically connected to the speed feedback terminal of the control chip U1, the end of the resistor R19 away from the resistor R20 is connected to the power supply terminal and the end of the resistor R20 away from the resistor R19 is connected to the first end of the connection terminal P1; The speed regulation circuit includes a diode D2 and a resistor R15, wherein the resistor R15 is connected to the anode of the diode D5 and the cathode of the diode D5 is connected to the third end of the connection terminal P1 and one end of the resistor R15 away from the diode D2 is connected to the speed regulation end of the control chip U1.

2. The control circuit of a brushless DC variable frequency motor for a tabletop range hood according to claim 1, characterized in that: The first path of pin 1 of the transistor Q1 is electrically connected to pin 12 of the control chip U1 through a resistor R4, the second path of pin 1 of the transistor Q1 is electrically connected to pin 17 of the control chip U1 through a resistor R9, the third path of pin 1 of the transistor Q1 is electrically connected to pin 20 of the control chip U1 through a resistor R21, the pin 2 of the transistor Q1 is electrically connected to pin 2 of the control chip U1 through a resistor R1, and the pin 4 of the transistor Q1 is electrically connected to pin 5 of the control chip U1 through a resistor R1; Pin 1 of the transistor Q2 is electrically connected to pin 13 of the control chip U1 through a resistor R5, pin 2 of the transistor Q2 is electrically connected to pin 1 of the control chip U1 through a resistor R5, and pin 4 of the transistor Q2 is electrically connected to pin 4 of the control chip U1 through a resistor R5; Pin 1 of the transistor Q3 is electrically connected to pin 16 of the control chip U1 through resistor R10, pin 2 of the transistor Q3 is electrically connected to pin 24 of the control chip U1 through resistor R12, and pin 4 of the transistor Q3 is electrically connected to pin 3 of the control chip U1 through resistor R13.

3. The control circuit of a brushless DC variable frequency motor for a tabletop range hood according to claim 2, characterized in that: A resistor RS1 and a resistor RS2 are connected in parallel between the pin 1 of the transistor Q1 and the pin 1 of the transistor Q2; A resistor RS3 and a resistor RS4 are connected in parallel between the pin 1 of the transistor Q1 and the pin 1 of the transistor Q3; Pin 1 of the transistor Q1 is also electrically connected to pin 19 of the control chip U1 through resistors RS6 and R11 . Both ends of the resistor RS6 are connected in parallel with resistor RS5 , and one end of the resistor RS6 away from the transistor Q1 is grounded.

4. The control circuit of a brushless DC variable frequency motor for a tabletop range hood according to claim 3, characterized in that: The two ends of the resistor RS2 are connected in parallel with a capacitor C5 , the two ends of the resistor RS3 are connected in parallel with a capacitor C10 , and the two ends of the resistor RS5 are connected in parallel with a capacitor C9 .

5. The control circuit of a brushless DC variable frequency motor for a tabletop range hood according to claim 4, characterized in that: It also includes a zero-crossing detection circuit, which includes a resistor R22, a resistor R23 and a resistor R24, wherein: One end of the resistor R22 is connected to the U phase interface and the other end of the resistor R22 is connected to the 18 pin of the control chip U1; One end of the resistor R23 is connected to the V phase interface and the other end of the resistor R23 is connected to the 15 pin of the control chip U1; One end of the resistor R24 ​​is connected to the W phase interface and the other end of the resistor R24 ​​is connected to the 14th pin of the control chip U1.

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