Direct current motor driving circuit with anti-counter electromotive force function

Abstract

The utility model discloses a direct-current motor drive circuit with a back electromotive force resisting function. The direct-current motor drive circuit comprises a direct-current power supply input module, a motor drive chip U2 and a motor phase output module, the direct current power supply input module comprises a diode D1, a capacitor C3, a capacitor C4 and a transient voltage suppression diode D2; a direct-current power supply input end positive electrode V + 1 and a direct-current power supply input end negative electrode V-1 form a loop through a diode D1 of the direct-current power supply input module so as to obtain a VIN end and a GND end; and a capacitor C3, a capacitor C4 and a transient voltage suppression diode D2 of the direct-current power supply input module are connected in parallel and then are connected between the VIN end and the GND end, so that a back electromotive force grounding path is formed. The utility model mainly solves the problem of how to provide an anti-counter electromotive force function for the direct current motor drive circuit. According to the utility model, the anti-counter electromotive force circuit with compact structure and reliable performance is provided for the direct current motor driving circuit, and the safety and stability of the direct current motor driving circuit are effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit protection modules, specifically a DC motor drive circuit with anti-back EMF function. Background Technology

[0002] DC motors are a common type of motor, widely used in household appliances, water pumps (such as booster pumps, circulating water pumps, and drainage pumps), automobiles, electronic equipment, communication equipment, medical equipment, and industrial equipment.

[0003] The operation of a DC motor (including starting, stopping, speed regulation, and commutation) depends on the DC motor drive circuit.

[0004] Existing DC motor drive circuits include at least integrated circuit components such as voltage regulator chips and stator drive chips, and require corresponding power electronic devices and other peripheral circuits.

[0005] DC motors generate back electromotive force during starting, braking, and other operating conditions. A strong back electromotive force can impact the low-voltage circuit modules connected in series or parallel with the phase poles of the DC motor, causing the low-voltage circuit modules to malfunction or break down.

[0006] How to provide anti-back EMF functionality for DC motor drive circuits has always been one of the technical problems that need to be solved in the field of DC motors. Utility Model Content

[0007] The purpose of this invention is to provide a DC motor drive circuit with back EMF protection function, which can provide back EMF protection function.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a DC motor drive circuit with anti-back EMF function, comprising a DC power input module, a motor drive chip U2, and a motor phase output module; the DC power input module, the motor drive chip U2, the motor phase output module, and the stator assembly of the DC motor are electrically connected in sequence according to their phase poles; the DC power input module includes a diode D1, a capacitor C3, a capacitor C4, and a transient voltage suppression diode D2; the positive terminal V+1 and the negative terminal V-1 of the DC power input are connected in parallel between the VIN terminal and the GND terminal to form a circuit through the diode D1 of the DC power input module to obtain the VIN terminal and the GND terminal; the capacitors C3 and C4 of the DC power input module and the transient voltage suppression diode D2 are connected in parallel between the VIN terminal and the GND terminal to form a back EMF grounding path.

[0009] In the above technical solution, the motor phase output module includes a dual-MOSFET packaged chip Q1, a dual-MOSFET packaged chip Q3, and a dual-MOSFET packaged chip Q4. The sources of the dual-MOSFET packaged chips Q1, Q3, and Q4 are all connected between the VIN terminal and the GND terminal. The drains of the dual-MOSFET packaged chips Q1, Q3, and Q4 are respectively connected to the respective phase poles of the DC motor. The gate drive output pins of the motor drive chip U2 are respectively connected to the gates of the dual-MOSFET packaged chips Q1, Q3, and Q4.

[0010] In the above technical solution, the VIN terminal is connected to the S2 pins of the dual MOSFET packaged chip Q1, Q3, and Q4, respectively; the GND terminal is connected to the S1 pins of the dual MOSFET packaged chip Q1, Q3, and Q4, respectively; the D1 / D2 pins of the dual MOSFET packaged chip Q1 are connected to the U phase of the DC motor, the D1 / D2 pins of the dual MOSFET packaged chip Q3 are connected to the V phase of the DC motor, and the D1 / D2 pins of the dual MOSFET packaged chip Q4 are connected to the W phase of the DC motor; The N1_OUT pin of the motor driver chip U2 is connected to the G1 pin of the dual MOSFET packaged chip Q1. The P1_OUT pin of the motor driver chip U2 is connected to the G2 pin of the dual MOSFET packaged chip Q1. The N2_OUT pin of the motor driver chip U2 is connected to the G1 pin of the dual MOSFET packaged chip Q3. The P2_OUT pin of the motor driver chip U2 is connected to the G2 pin of the dual MOSFET packaged chip Q3. The N3_OUT pin of the motor driver chip U2 is connected to the G1 pin of the dual MOSFET packaged chip Q4. The P3_OUT pin of the motor driver chip U2 is connected to the G2 pin of the dual MOSFET packaged chip Q4.

[0011] In the above technical solution, the DC motor drive circuit with anti-back EMF function of this utility model also includes a speed feedback module; the speed feedback module includes a transistor Q2 that constitutes a signal amplifier; the FG1 signal feedback terminal of the DC motor is connected to the ADC analog input pin of the motor drive chip U2 after passing through the signal amplifier formed by the transistor Q2.

[0012] In the above technical solution, the DC motor drive circuit with anti-back EMF function of this utility model also includes a speed control module; the PWM output pin of the motor drive chip U2 is connected to the speed control terminal SP1 of the DC motor via the speed control module.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: In the DC motor drive circuit with anti-back EMF function of this utility model, the capacitors C3 and C4 of the DC power input module and the transient voltage suppression diode D2 are connected in parallel between the VIN terminal and the GND terminal to form a back EMF grounding path. The back EMF generated by the DC motor during starting, braking and other operating conditions can be absorbed by passing through this back EMF grounding path to the ground of the filter capacitor / TVS short-circuit ground. In addition, the positive terminal V+1 and the negative terminal V-1 of the DC power input terminal form a loop through the diode D1 of the DC power input module, which can prevent the back EMF from entering the power supply terminal. The DC motor drive circuit with anti-back EMF function of this utility model provides a compact and reliable anti-back EMF circuit for DC motor drive circuits, effectively improving the safety and stability of DC motor drive circuits. Attached Figure Description

[0014] Figure 1 This is a circuit diagram of the DC power input module in this utility model.

[0015] Figure 2 This is a circuit diagram of the motor drive chip U2 in this utility model.

[0016] Figure 3 This is a circuit diagram of the motor phase output module in this utility model.

[0017] Figure 4 This is a circuit diagram of the speed feedback module in this utility model.

[0018] Figure 5 This is a circuit diagram of the speed control module in this utility model. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This embodiment provides a DC motor drive circuit with back EMF protection function, used to drive a DC motor and provide back EMF protection function.

[0021] Please see Figures 1-3 The DC motor drive circuit with anti-back EMF function in this embodiment includes a DC power input module, a motor drive chip U2, and a motor phase output module.

[0022] The DC power input module, motor drive chip U2, motor phase output module, and stator assembly of the DC motor are electrically connected in sequence according to their phase poles.

[0023] The motor driver chip U2 is model CMS32M5526, which has at least N1_OUT pin, P1_OUT pin, N2_OUT pin, P2_OUT pin, N3_OUT pin, P3_OUT pin (i.e., the gate drive output pins corresponding to each phase of the DC motor), ADC analog input pin, PWM output pin, as well as other necessary general-purpose input / output pins and serial communication pins.

[0024] To provide back EMF protection, the DC power input module includes diode D1, capacitors C3 and C4, and transient voltage suppressor diode D2. The positive terminal V+1 and the negative terminal V-1 of the DC power input are connected in parallel through diode D1 of the DC power input module to obtain the VIN terminal and GND terminal. The capacitors C3 and C4 of the DC power input module and the transient voltage suppressor diode D2 are connected in parallel between the VIN terminal and the GND terminal to form a back EMF grounding path.

[0025] Specifically, the motor phase output module includes dual-MOSFET packaged chip Q1, dual-MOSFET packaged chip Q3, and dual-MOSFET packaged chip Q4.

[0026] Among them, the dual field-effect transistor packaged chip Q1, the dual field-effect transistor packaged chip Q3 and the dual field-effect transistor packaged chip Q4 are all model AP25G04GD, that is, each of the dual field-effect transistor packaged chip Q1, the dual field-effect transistor packaged chip Q3 and the dual field-effect transistor packaged chip Q4 packages two field-effect transistors, and the drains of the two field-effect transistors are connected together.

[0027] The sources of the dual MOSFET packaged chip Q1, the dual MOSFET packaged chip Q3, and the dual MOSFET packaged chip Q4 of the motor phase output module are all connected between the VIN terminal and the GND terminal.

[0028] The drains of the dual MOSFET packaged chip Q1, the dual MOSFET packaged chip Q3, and the dual MOSFET packaged chip Q4 of the motor phase output module are respectively connected to each phase pole of the DC motor.

[0029] The gate drive output pins of the motor drive chip U2 are respectively connected to the gates of the dual field-effect transistor packaged chip Q1, the dual field-effect transistor packaged chip Q3, and the dual field-effect transistor packaged chip Q4 of the motor phase output module.

[0030] More specifically, the VIN terminal is connected to the S2 pins of dual MOSFET packaged chips Q1, Q3, and Q4, respectively; the GND terminal is connected to the S1 pins of dual MOSFET packaged chips Q1, Q3, and Q4, respectively; the D1 / D2 pins of dual MOSFET packaged chips Q1 are connected to the U phase of the DC motor, the D1 / D2 pins of dual MOSFET packaged chips Q3 are connected to the V phase of the DC motor, and the D1 / D2 pins of dual MOSFET packaged chips Q4 are connected to the W phase of the DC motor. The N1_OUT pin of motor driver chip U2 is connected to the G1 pin of dual MOSFET package chip Q1, the P1_OUT pin of motor driver chip U2 is connected to the G2 pin of dual MOSFET package chip Q1, the N2_OUT pin of motor driver chip U2 is connected to the G1 pin of dual MOSFET package chip Q3, the P2_OUT pin of motor driver chip U2 is connected to the G2 pin of dual MOSFET package chip Q3, the N3_OUT pin of motor driver chip U2 is connected to the G1 pin of dual MOSFET package chip Q4, and the P3_OUT pin of motor driver chip U2 is connected to the G2 pin of dual MOSFET package chip Q4.

[0031] After connecting in the above manner, DC power supply for the U-phase, V-phase, and W-phase of the DC motor is realized. Furthermore, the motor drive chip U2 can control the dual-MOSFET packaged chips Q1, Q3, and Q4 of the motor phase output module in a PWM manner, thereby controlling the switching duty cycle of the dual-MOSFET packaged chips Q1, Q3, and Q4 to realize the start-stop, commutation, and forward / reverse control of the DC motor.

[0032] Further, please refer to Figure 4 The DC motor drive circuit with anti-back EMF function in this embodiment also includes a speed feedback module, which includes a transistor Q2 that constitutes a signal amplifier; the FG1 signal feedback terminal of the DC motor is connected to the ADC analog input pin (pin 22 in this embodiment) of the motor drive chip U2 after being amplified by the signal amplifier composed of transistor Q2.

[0033] After connecting in the above manner, the motor speed feedback is realized, so as to further realize the closed-loop control of the motor drive chip U2 and the motor phase output module.

[0034] Further, please refer to Figure 5 The DC motor drive circuit with anti-back EMF function in this embodiment also includes a speed control module; the PWM output pin of the motor drive chip U2 (pin 1 in this embodiment) is connected to the speed control terminal SP1 of the DC motor via the speed control module; in this embodiment, the speed control module includes a Zener diode D3, a capacitor C5 and a resistor R6 connected in parallel, and also includes resistors R3 and R5 connected before the speed control terminal SP1 of the DC motor.

[0035] After connecting in the above manner, the PWM speed control function of the motor driver chip U2 for the DC motor is realized.

[0036] In this embodiment, the DC motor drive circuit with back EMF protection function has capacitors C3 and C4 of the DC power input module and transient voltage suppression diode D2 connected in parallel between the VIN terminal and the GND terminal to form a back EMF grounding path. The back EMF generated by the DC motor during starting, braking, and other operating conditions can be absorbed by passing through this back EMF grounding path to the ground / TVS short-circuit ground of the filter capacitor (i.e., the short-circuit ground of transient voltage suppression diode D2). In addition, the positive terminal V+1 and the negative terminal V-1 of the DC power input terminal form a loop through diode D1 of the DC power input module, which can prevent the back EMF from entering the power supply terminal. This embodiment of the DC motor drive circuit with back EMF protection function provides a compact and reliable back EMF protection circuit for DC motor drive circuits, effectively improving the safety and stability of DC motor drive circuits.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A direct current motor driving circuit with anti-counter electromotive force function, comprising a direct current power input module, a motor driving chip U2 and a motor phase output module; The direct current power input module, the motor driving chip U2, the motor phase output module and a stator assembly of a direct current motor are electrically connected in sequence according to phase poles; characterized in that The direct current power input module comprises a diode D1, a capacitor C3, a capacitor C4 and a transient voltage suppression diode D2; A positive pole V+1 of a direct current power input end and a negative pole V-1 of the direct current power input end form a loop via the diode D1 of the direct current power input module to obtain a VIN end and a GND end; The capacitor C3, the capacitor C4 and the transient voltage suppression diode D2 of the direct current power input module are connected in parallel between the VIN end and the GND end to form a counter electromotive force grounding path.

2. The DC motor drive circuit with back-EMF function according to claim 1, wherein, The motor phase output module comprises a dual field effect tube package chip Q1, a dual field effect tube package chip Q3 and a dual field effect tube package chip Q4; The source of the dual field effect tube package chip Q1, the source of the dual field effect tube package chip Q3 and the source of the dual field effect tube package chip Q4 of the motor phase output module are connected between the VIN end and the GND end; The drain of the dual field effect tube package chip Q1, the drain of the dual field effect tube package chip Q3 and the drain of the dual field effect tube package chip Q4 of the motor phase output module are respectively connected to each phase pole of the direct current motor; Each gate drive output pin of the motor driving chip U2 is respectively connected to the gate of the dual field effect tube package chip Q1, the gate of the dual field effect tube package chip Q3 and the gate of the dual field effect tube package chip Q4 of the motor phase output module.

3. The DC motor drive circuit with back-EMF function according to claim 2, wherein The VIN end is respectively connected to the S2 pin of the dual field effect tube package chip Q1, the S2 pin of the dual field effect tube package chip Q3 and the S2 pin of the dual field effect tube package chip Q4; The GND end is respectively connected to the S1 pin of the dual field effect tube package chip Q1, the S1 pin of the dual field effect tube package chip Q3 and the S1 pin of the dual field effect tube package chip Q4; The D1 / D2 pin of the dual field effect tube package chip Q1 is connected to the U phase of the direct current motor, the D1 / D2 pin of the dual field effect tube package chip Q3 is connected to the V phase of the direct current motor, and the D1 / D2 pin of the dual field effect tube package chip Q4 is connected to the W phase of the direct current motor. The N1_OUT pin of the motor drive chip U2 is connected to the G1 pin of the dual field effect tube package chip Q1, the P1_OUT pin of the motor drive chip U2 is connected to the G2 pin of the dual field effect tube package chip Q1, the N2_OUT pin of the motor drive chip U2 is connected to the G1 pin of the dual field effect tube package chip Q3, the P2_OUT pin of the motor drive chip U2 is connected to the G2 pin of the dual field effect tube package chip Q3, the N3_OUT pin of the motor drive chip U2 is connected to the G1 pin of the dual field effect tube package chip Q4, and the P3_OUT pin of the motor drive chip U2 is connected to the G2 pin of the dual field effect tube package chip Q4.

4. The DC motor drive circuit having a function of resisting counter electromotive voltage according to any one of claims 1 to 3, characterized by A rotating speed feedback module is further included. The rotating speed feedback module includes a transistor Q2 constituting a signal amplifier. The FG1 signal feedback end of the DC motor is connected to the ADC analog input pin of the motor drive chip U2 via the signal amplifier constituted by the transistor Q2.

5. The DC motor drive circuit having a function of resisting counter electromotive voltage according to any one of claims 1 to 3, characterized by A speed regulation module is further included. The PWM output pin of the motor drive chip U2 is connected to the speed regulation end SP1 of the DC motor via the speed regulation module.

Images