Two-phase brushless motor speed regulation control circuit

Abstract

The utility model discloses a speed regulation control circuit of a two-phase brushless motor. The speed regulation control circuit comprises a commutation control module, a PWM signal switch module, a first driving module and a second driving module, the input end of the PWM signal switch module is connected with a PWM signal, the input end of the first driving module and the input end of the second driving module are both connected with the output end of the PWM signal switch module, and the PWM signal switch module is used for controlling on-off of the PWM signal; the output end of the first driving module and the output end of the second driving module are both connected with the two-phase brushless motor, and the first driving module and the second driving module are used for driving the two-phase brushless motor to rotate; and the commutation control module is respectively connected with the switch control ends of the first driving module and the second driving module. According to the two-phase brushless motor speed regulation control circuit provided by the utility model, a simple circuit structure in which the two MOS tubes drive the two-phase brushless motor is adopted, so that a traditional H-bridge circuit structure is replaced, and the manufacturing cost of a product can be greatly reduced.

Description

Technical Field

[0001] The utility model relates to a two-phase brushless motor speed regulation control circuit, belonging to the field of motor control. Background Art

[0002] At present, the brushless motor control speed regulation system has achieved rapid development under the increasingly perfect control theory. In the specific implementation, it is generally to adjust the current and voltage of the motor, use MCU to generate PWM, and adjust the speed of the control drive circuit.

[0003] In two-phase motors, an H-bridge circuit is generally used as a driving circuit to drive the motor. The H-bridge circuit requires a large number of MOS tubes. For some cost-sensitive projects, the cost of using an MCU plus an H-bridge control circuit is obviously relatively high. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a two-phase brushless motor speed control circuit, which adopts a simple circuit structure of two MOS tubes to drive the two-phase brushless motor, thereby replacing the traditional H-bridge circuit structure, which can greatly reduce the manufacturing cost of the product.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A two-phase brushless motor speed control circuit comprises a phase change control module, a PWM signal switch module, a first drive module and a second drive module;

[0007] The input end of the PWM signal switch module is connected to the PWM signal, the input end of the first driving module and the input end of the second driving module are both connected to the output end of the PWM signal switch module, and the PWM signal switch module is used to control the on and off of the PWM signal;

[0008] The output end of the first driving module and the output end of the second driving module are both connected to the two-phase brushless motor, and the first driving module and the second driving module are used to drive the two-phase brushless motor to rotate;

[0009] The commutation control module is connected to the switch control ends of the first drive module and the second drive module respectively. The commutation control module is used to sense the N pole and S pole of the rotor of the two-phase brushless motor, and then control the on and off of the first drive module and the second drive module to control the two-phase brushless motor to perform commutation rotation.

[0010] Further, the PWM signal switch module includes a resistor R7, a resistor R8, a resistor R10, a capacitor C3 and a transistor Q2, one end of the resistor R7 is connected to a DC power supply, the other end of the resistor R7 is connected to a PWM signal, one end of the capacitor C3 is connected to the other end of the resistor R7, the other end of the capacitor C3 is connected to a DC ground, the emitter of the transistor Q2 is connected to the DC power supply, the base of the transistor Q2 is connected to the other end of the resistor R7 through the resistor R10, one end of the resistor R8 is connected to the emitter of the transistor Q2, the other end of the resistor R8 is connected to the base of the transistor Q2, and the collector of the transistor Q2 is connected to the input end of the first driving module and the input end of the second driving module.

[0011] Furthermore, the transistor Q2 is a PNP transistor.

[0012] Further, the commutation control module includes a Hall sensor U1, a resistor R5 and a resistor R6, wherein pin 1 of the Hall sensor U1 is connected to a DC power supply, one end of the resistor R5 is connected to pin 1 of the Hall sensor U1, the other end of the resistor R5 is connected to pin 3 of the Hall sensor U1, pin 3 of the Hall sensor U1 is connected to a switch control end of a first driving module, one end of the resistor R6 is connected to pin 3 of the Hall sensor U1, the other end of the resistor R6 is connected to a second driving module, and pin 2 of the Hall sensor U1 is connected to a DC ground.

[0013] Further, the first driving module includes a diode D2, a resistor R3, a capacitor C1, a transistor Q1, a resistor R4, a resistor R1, a resistor R2, a MOS tube FET1 and a diode D1, wherein the anode of the diode D2 is connected to the output end of the PWM generation module, the cathode of the diode D2 is connected to the emitter of the transistor Q1, one end of the resistor R3 is connected to the emitter of the transistor Q1, the other end of the resistor R3 is connected to the base of the transistor Q1, one end of the capacitor C1 is connected to the other end of the resistor R3, the other end of the capacitor C1 is connected to the 3rd pin of the Hall sensor U1, and one end of the resistor R4 is connected to the transistor Q1 The base of the transistor Q1 is connected to the base of the transistor R2, the other end of the resistor R4 is connected to the 3rd pin of the Hall sensor U1, the collector of the transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the gate of the MOS tube FET1, the source of the MOS tube FET1 is connected to the DC ground, one end of the resistor R2 is connected to the gate of the MOS tube FET1, the other end of the resistor R2 is connected to the source of the MOS tube FET1, the drain of the MOS tube FET1 is connected to a winding of the two-phase brushless motor, the anode of the diode D1 is connected to the drain of the MOS tube FET1, and the cathode of the diode D1 is connected to the common DC power supply terminal.

[0014] Further, the second driving module includes a resistor R9, a transistor Q3, a diode D4, a resistor R12, a capacitor C2, a transistor Q4, a resistor R11, a resistor R13, a resistor R14, a MOS tube FET2 and a diode D3, wherein the anode of the diode D4 is connected to the output end of the PWM signal switch module, the cathode of the diode D4 is connected to the emitter of the transistor Q4, one end of the resistor R12 is connected to the emitter of the transistor Q4, the other end of the resistor R12 is connected to the base of the transistor Q4, one end of the capacitor C2 is connected to the other end of the resistor R12, the other end of the capacitor C2 is connected to the collector of the transistor Q3, one end of the resistor R9 is connected to the collector of the transistor Q3, the other end of the resistor R9 is connected to the DC power supply, and the transistor Q3 The base of the transistor R1 is connected to the other end of the resistor R6, the emitter of the transistor Q3 is connected to the DC ground, one end of the resistor R11 is connected to the base of the transistor Q4, the other end of the resistor R11 is connected to the collector of the transistor Q3, the collector of the transistor Q4 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to the gate of the MOS tube FET2, the source of the MOS tube FET2 is connected to the DC ground, one end of the resistor R14 is connected to the gate of the MOS tube FET2, the other end of the resistor R14 is connected to the source of the MOS tube FET2, the drain of the MOS tube FET2 is connected to another winding of the two-phase brushless motor, the anode of the diode D3 is connected to the drain of the MOS tube FET2, and the cathode of the diode D3 is connected to the common DC power supply terminal.

[0015] Furthermore, the common end of the two-phase brushless motor is connected to a common DC power supply end.

[0016] Furthermore, the transistor Q1 and the transistor Q4 are both PNP transistors, and the transistor Q3 is an NPN transistor.

[0017] Furthermore, both the MOS tube FET1 and the MOS tube FET2 are NMOS tubes.

[0018] Furthermore, the model of the Hall sensor U1 is SC2402UA.

[0019] By adopting the above technical solution, the overall phase change of the utility model adopts a single Hall induction magnetic ring pole, and cooperates with the asymmetric gradual air gap of the motor to achieve the purpose of phase change and save costs. The two-phase windings of the motor are connected at a common point, and the two-phase windings are respectively connected to the MOS tubes of the two drive modules. Compared with the H-bridge structure, the MOS tube or triode of the upper bridge is saved, the circuit is simpler and more practical, and the manufacturing cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1This is a principle block diagram of a two-phase brushless motor speed control circuit of the utility model;

[0021] Figure 2 The utility model is a circuit schematic diagram of a two-phase brushless motor speed control circuit. DETAILED DESCRIPTION

[0022] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0023] like Figure 1 As shown, this embodiment provides a two-phase brushless motor speed control circuit, which includes a phase change control module, a PWM signal switch module, a first drive module and a second drive module.

[0024] The input end of the PWM signal switch module is connected to the PWM signal, the input end of the first driving module and the input end of the second driving module are both connected to the output end of the PWM signal switch module, and the PWM signal switch module is used to control the on and off of the PWM signal;

[0025] The output end of the first driving module and the output end of the second driving module are both connected to the two-phase brushless motor, and the first driving module and the second driving module are used to drive the two-phase brushless motor to rotate;

[0026] The commutation control module is connected to the switch control ends of the first drive module and the second drive module respectively. The commutation control module is used to sense the N pole and S pole of the rotor of the two-phase brushless motor, and then control the on and off of the first drive module and the second drive module to control the two-phase brushless motor to perform commutation rotation.

[0027] like Figure 2 As shown, the PWM signal switch module of this embodiment includes a resistor R7, a resistor R8, a resistor R10, a capacitor C3 and a transistor Q2, one end of the resistor R7 is connected to a DC power supply, the other end of the resistor R7 is connected to a PWM signal, one end of the capacitor C3 is connected to the other end of the resistor R7, the other end of the capacitor C3 is connected to a DC ground, the emitter of the transistor Q2 is connected to the DC power supply, the base of the transistor Q2 is connected to the other end of the resistor R7 through the resistor R10, one end of the resistor R8 is connected to the emitter of the transistor Q2, the other end of the resistor R8 is connected to the base of the transistor Q2, and the collector of the transistor Q2 is connected to the input end of the first driving module and the input end of the second driving module. When the PWM signal is at a low level, the transistor Q2 is turned on; when the PWM signal is at a high level, the transistor Q2 is turned off and is not turned on.

[0028] like Figure 2As shown, the commutation control module of this embodiment includes a Hall sensor U1, a resistor R5 and a resistor R6. The model of the Hall sensor U1 of this embodiment is SC2402UA but not limited to it. Pin 1 of the Hall sensor U1 is connected to a DC power supply, and the DC power supply of this embodiment is 15V. One end of the resistor R5 is connected to pin 1 of the Hall sensor U1, and the other end of the resistor R5 is connected to pin 3 of the Hall sensor U1. Pin 3 of the Hall sensor U1 is connected to the switch control end of the first drive module, one end of the resistor R6 is connected to pin 3 of the Hall sensor U1, and the other end of the resistor R6 is connected to the second drive module. Pin 2 of the Hall sensor U1 is connected to the DC ground.

[0029] like Figure 2 As shown, the first driving module of this embodiment includes a diode D2, a resistor R3, a capacitor C1, a transistor Q1, a resistor R4, a resistor R1, a resistor R2, a MOS transistor FET1 and a diode D1, and the MOS transistor FET1 is an NMOS transistor. The anode of the diode D2 is connected to the output end of the PWM generation module, the cathode of the diode D2 is connected to the emitter of the transistor Q1, one end of the resistor R3 is connected to the emitter of the transistor Q1, the other end of the resistor R3 is connected to the base of the transistor Q1, one end of the capacitor C1 is connected to the other end of the resistor R3, the other end of the capacitor C1 is connected to pin 3 of the Hall sensor U1, one end of the resistor R4 is connected to the base of the transistor Q1, the other end of the resistor R4 is connected to pin 3 of the Hall sensor U1, the collector of the transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the gate of the MOS tube FET1, the source of the MOS tube FET1 is connected to the DC ground, one end of the resistor R2 is connected to the gate of the MOS tube FET1, the other end of the resistor R2 is connected to the source of the MOS tube FET1, the drain of the MOS tube FET1 is connected to a winding of the two-phase brushless motor, the anode of the diode D1 is connected to the drain of the MOS tube FET1, and the cathode of the diode D1 is connected to the common DC power supply terminal DC BUS.

[0030] like Figure 2As shown, the second driving module of this embodiment includes a resistor R9, a transistor Q3, a diode D4, a resistor R12, a capacitor C2, a transistor Q4, a resistor R11, a resistor R13, a resistor R14, a MOS transistor FET2 and a diode D3, wherein the MOS transistor FET2 is an NMOS transistor. The anode of the diode D4 is connected to the output end of the PWM signal switch module, the cathode of the diode D4 is connected to the emitter of the transistor Q4, one end of the resistor R12 is connected to the emitter of the transistor Q4, the other end of the resistor R12 is connected to the base of the transistor Q4, one end of the capacitor C2 is connected to the other end of the resistor R12, the other end of the capacitor C2 is connected to the collector of the transistor Q3, one end of the resistor R9 is connected to the collector of the transistor Q3, the other end of the resistor R9 is connected to the DC power supply, the base of the transistor Q3 is connected to the other end of the resistor R6, the emitter of the transistor Q3 is connected to the DC ground, one end of the resistor R11 is connected to the collector of the transistor Q3, the other ... collector of the transistor Q3, the other end of the resistor R9 is connected to the collector of the transistor Q3, the other end of the resistor R9 is connected to the collector of the transistor Q3, the base of the transistor Q3 is connected to the other end of the resistor R6, the emitter of the transistor Q3 is connected to the DC ground, one end of the resistor R11 is connected to the collector of the transistor Q3, The base of the transistor Q4 is connected, the other end of the resistor R11 is connected to the collector of the transistor Q3, the collector of the transistor Q4 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to the gate of the MOS tube FET2, the source of the MOS tube FET2 is connected to the DC ground, one end of the resistor R14 is connected to the gate of the MOS tube FET2, the other end of the resistor R14 is connected to the source of the MOS tube FET2, the drain of the MOS tube FET2 is connected to the other winding of the two-phase brushless motor, the anode of the diode D3 is connected to the drain of the MOS tube FET2, and the cathode of the diode D3 is connected to the common DC power supply terminal DC BUS.

[0031] The working principle of a two-phase brushless motor speed control circuit of this embodiment is:

[0032] like Figure 2As shown, the two-phase windings of the two-phase brushless motor of this embodiment are connected at a common point, and the common end of the two-phase brushless motor is connected to the common DC power supply end DC BUS. The common DC power supply end of this embodiment is about 170V DC voltage, and the two-phase windings are connected to the drains CN1 and CN2 of the MOS tube FET1 and the MOS tube FET2 respectively. The Hall sensor U1 senses the magnetic field of the motor rotor. When the Hall sensor U1 senses the N pole of the rotor, the 3-pin output of the Hall sensor U1 is high level. At this time, the transistor Q1 (PNP) is cut off and not turned on, the transistor Q3 (NPN) and the transistor Q4 (PNP) are turned on, and the driving voltage drives the MOS tube FET2 to turn on through the diode D4 and the transistor Q4. When the Hall sensor U1 senses the S pole of the rotor, the 3-pin output of the Hall sensor U1 is low level. At this time, the transistor Q3 and the transistor Q4 are cut off and not turned on, the transistor Q1 is turned on, and the driving voltage drives the MOS tube FET1 to turn on through the diode D2 and the transistor Q1, that is, the motor phase change rotation is completed. The front-end transistor Q2 (PNP) is driven by PWM modulation. A 15V DC power supply can be used to drive the MOS tube through modulation to control the speed. The 15V DC power supply can be driven by PWM modulation by connecting the transistor to the MCU, or by using a 555 timer or directly using a hardware circuit to generate a modulation wave.

[0033] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-phase brushless motor speed control circuit, characterized in that: It includes a phase-changing control module, a PWM signal switch module, a first drive module and a second drive module; The input end of the PWM signal switch module is connected to the PWM signal, the input end of the first driving module and the input end of the second driving module are both connected to the output end of the PWM signal switch module, and the PWM signal switch module is used to control the on and off of the PWM signal; The output end of the first driving module and the output end of the second driving module are both connected to the two-phase brushless motor, and the first driving module and the second driving module are used to drive the two-phase brushless motor to rotate; The commutation control module is connected to the switch control ends of the first drive module and the second drive module respectively. The commutation control module is used to sense the N pole and S pole of the rotor of the two-phase brushless motor, and then control the on and off of the first drive module and the second drive module to control the two-phase brushless motor to perform commutation rotation.

2. The two-phase brushless motor speed control circuit according to claim 1 is characterized in that: The PWM signal switch module includes a resistor R7, a resistor R8, a resistor R10, a capacitor C3 and a transistor Q2, one end of the resistor R7 is connected to a DC power supply, the other end of the resistor R7 is connected to a PWM signal, one end of the capacitor C3 is connected to the other end of the resistor R7, the other end of the capacitor C3 is connected to a DC ground, the emitter of the transistor Q2 is connected to the DC power supply, the base of the transistor Q2 is connected to the other end of the resistor R7 through the resistor R10, one end of the resistor R8 is connected to the emitter of the transistor Q2, the other end of the resistor R8 is connected to the base of the transistor Q2, and the collector of the transistor Q2 is connected to the input end of the first driving module and the input end of the second driving module.

3. The two-phase brushless motor speed control circuit according to claim 2 is characterized in that: The transistor Q2 is a PNP transistor.

4. The two-phase brushless motor speed control circuit according to claim 1 is characterized in that: The commutation control module includes a Hall sensor U1, a resistor R5 and a resistor R6, wherein pin 1 of the Hall sensor U1 is connected to a DC power supply, one end of the resistor R5 is connected to pin 1 of the Hall sensor U1, the other end of the resistor R5 is connected to pin 3 of the Hall sensor U1, pin 3 of the Hall sensor U1 is connected to a switch control end of a first driving module, one end of the resistor R6 is connected to pin 3 of the Hall sensor U1, the other end of the resistor R6 is connected to a second driving module, and pin 2 of the Hall sensor U1 is connected to a DC ground.

5. The two-phase brushless motor speed control circuit according to claim 4 is characterized in that: The first driving module includes a diode D2, a resistor R3, a capacitor C1, a transistor Q1, a resistor R4, a resistor R1, a resistor R2, a MOS tube FET1 and a diode D1, wherein the anode of the diode D2 is connected to the output end of the PWM generation module, the cathode of the diode D2 is connected to the emitter of the transistor Q1, one end of the resistor R3 is connected to the emitter of the transistor Q1, the other end of the resistor R3 is connected to the base of the transistor Q1, one end of the capacitor C1 is connected to the other end of the resistor R3, the other end of the capacitor C1 is connected to the 3rd pin of the Hall sensor U1, one end of the resistor R4 is connected to the base of the transistor Q1, and the other end of the capacitor C1 is connected to the 3rd pin of the Hall sensor U1. The collector of the transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the gate of the MOS tube FET1, the source of the MOS tube FET1 is connected to the DC ground, one end of the resistor R2 is connected to the gate of the MOS tube FET1, the other end of the resistor R2 is connected to the source of the MOS tube FET1, the drain of the MOS tube FET1 is connected to a winding of the two-phase brushless motor, the anode of the diode D1 is connected to the drain of the MOS tube FET1, and the cathode of the diode D1 is connected to the common DC power supply terminal.

6. The two-phase brushless motor speed control circuit according to claim 5, characterized in that: The second driving module includes a resistor R9, a transistor Q3, a diode D4, a resistor R12, a capacitor C2, a transistor Q4, a resistor R11, a resistor R13, a resistor R14, a MOS tube FET2 and a diode D3, wherein the anode of the diode D4 is connected to the output end of the PWM signal switch module, the cathode of the diode D4 is connected to the emitter of the transistor Q4, one end of the resistor R12 is connected to the emitter of the transistor Q4, the other end of the resistor R12 is connected to the base of the transistor Q4, one end of the capacitor C2 is connected to the other end of the resistor R12, the other end of the capacitor C2 is connected to the collector of the transistor Q3, one end of the resistor R9 is connected to the collector of the transistor Q3, the other end of the resistor R9 is connected to the DC power supply, and the base of the transistor Q3 is connected to the collector of the transistor Q3. The emitter of the transistor Q3 is connected to the DC ground, one end of the resistor R11 is connected to the base of the transistor Q4, the other end of the resistor R11 is connected to the collector of the transistor Q3, the collector of the transistor Q4 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to the gate of the MOS tube FET2, the source of the MOS tube FET2 is connected to the DC ground, one end of the resistor R14 is connected to the gate of the MOS tube FET2, the other end of the resistor R14 is connected to the source of the MOS tube FET2, the drain of the MOS tube FET2 is connected to another winding of the two-phase brushless motor, the anode of the diode D3 is connected to the drain of the MOS tube FET2, and the cathode of the diode D3 is connected to the common DC power supply terminal.

7. The two-phase brushless motor speed control circuit according to claim 6 is characterized in that: The common end of the two-phase brushless motor is connected to a common DC power supply end.

8. The two-phase brushless motor speed control circuit according to claim 6, characterized in that: The transistor Q1 and the transistor Q4 are both PNP transistors, and the transistor Q3 is an NPN transistor.

9. The two-phase brushless motor speed control circuit according to claim 6, characterized in that: The MOS tube FET1 and the MOS tube FET2 are both NMOS tubes.

10. The two-phase brushless motor speed control circuit according to claim 4, characterized in that: The model of the Hall sensor U1 is SC2402UA.

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