Anti-interference motor driving board

Abstract

The utility model discloses an anti-interference motor driving board, a driving circuit is arranged on the driving board, the driving circuit comprises a switching circuit, a driving chip and a Hall sensor, the switching circuit comprises a protection circuit and a switching device, and the switching circuit is provided with an electronic fuse F1, a filter capacitor C1, a transient voltage suppression diode TVS1 and a Y capacitor CY. The electronic fuse F1 is connected in series with a direct current power supply VDC, the filter capacitor C1 and the transient voltage suppression diode TVS1 are respectively connected in parallel in a switching circuit, and the Y capacitor CY is connected with a three-phase neutral line of a motor and is grounded. The drive circuit in the anti-interference motor drive board is provided with surge protection, EMC protection and the Y capacitor, the Y capacitor is grounded, and the three-phase neutral line is connected with the Y capacitor, so that high and low frequency electromagnetic signal interference is effectively shielded.

Description

Technical Field

[0001] The utility model relates to the technical field of motor drive control, in particular to an anti-interference motor drive board. Background Art

[0002] A brushless DC motor is a synchronous motor that uses a direct current (DC) power supply. It uses a DC power input and is converted to a three-phase AC power supply by an inverter. The three-phase AC power supply is input to the motor's U, V, and W three-phase winding coils. When the winding coils are energized, a magnetic field is generated. The magnetic field is driven by the magnetic poles. Like polarities repel each other, while opposite polarities attract each other. Appropriate magnetic poles drive the rotor to rotate, continuously changing the direction of the current in the coil. The magnetic poles of the magnetic field induced by the rotor will also continuously change, and the rotor will continue to rotate under the action of the magnetic field.

[0003] Since DC motors are driven by magnetic fields, interference magnetic fields will be generated when the motor starts, stops, or adjusts its speed. The magnetic field conduction affects the components of the drive circuit. Utility Model Content

[0004] The purpose of the utility model is to provide an anti-interference motor drive board, the drive circuit is provided with surge protection, EMC protection, a Y capacitor is provided, the Y capacitor is grounded, the three-phase neutral line is connected to the Y capacitor, and high and low frequency electromagnetic signal interference is shielded.

[0005] The above technical objectives of the present utility model are achieved through the following technical solutions: an anti-interference motor drive board, a drive circuit is provided on the drive board, the drive circuit includes a switching circuit, a drive chip and a Hall sensor, the switching circuit includes a protection circuit and a switching device, the switching circuit is provided with an electronic fuse F1, a filter capacitor C1, a transient voltage suppression diode TVS1 and a Y capacitor CY, the electronic fuse F1 is connected in series with a DC power supply VDC, the filter capacitor C1 and the transient voltage suppression diode TVS1 are respectively connected in parallel in the switching circuit, and the Y capacitor CY is connected to the three-phase neutral line of the motor and grounded.

[0006] The present invention is further configured as follows: it further includes a filter capacitor C2, and the filter capacitor C2 is connected in parallel with the filter capacitor C1.

[0007] The present invention is further configured as follows: the switching device includes a complementary field effect transistor Q1, a complementary field effect transistor Q2, and a complementary field effect transistor Q3, and the complementary field effect transistors Q1, Q2, and Q3 are connected in parallel to form a three-phase inverter bridge.

[0008] The present invention is further configured as follows: the drains D1 and D2 of the complementary field effect transistor Q1 are connected to the U phase of the DC motor.

[0009] The present invention is further configured as follows: the base G1 of the complementary field effect transistor Q1 is connected to the driver chip U1 to input a low level signal LOU, and the base G2 of the complementary field effect transistor Q1 is connected to the driver chip U1 to input a high level signal HOU.

[0010] The present invention is further configured as follows: the source S1 of the complementary field effect transistor Q1 is connected to the power supply end, the source S2 of the complementary field effect transistor Q1 is connected to the negative terminal, and the negative terminal is grounded.

[0011] The present invention is further configured as follows: a resistor R5 and a capacitor C6 are connected in parallel between the source S1 and the base G1 of the complementary field effect transistor Q1 , and a resistor R2 and a capacitor C3 are connected in parallel between the source S2 and the base G2 of the complementary field effect transistor Q1 .

[0012] The present invention is further configured as follows: the complementary field effect transistors Q1, Q2, and Q3 are all of model IM4712 / PDFN-8 / 5X6.

[0013] The present invention is further configured as follows: the driving chip is a single-chip microcomputer U1, the model of the single-chip microcomputer U1 is IU6332, the single-chip microcomputer U1 is connected to complementary field effect transistors Q1, Q2, and Q3, and the single-chip microcomputer U1 is connected to a first Hall sensor, a second Hall sensor, and a third Hall sensor.

[0014] The present invention is further configured as follows: the power supply end of the first Hall sensor is connected to a 5V DC power supply, and the output end of the first Hall sensor is connected to the pin 25 of the single chip microcomputer U1.

[0015] Compared with the existing technology, the utility model provides an anti-interference motor drive board, on which a drive circuit is provided, and the drive circuit is provided with surge protection, EMC protection, and a Y capacitor. The Y capacitor is grounded, and the three-phase neutral line is connected to the Y capacitor, which can effectively shield high and low frequency electromagnetic signal interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model discloses a driving circuit diagram of an anti-interference motor driving board.

[0017] Figure 2 The utility model discloses a switch circuit diagram of an anti-interference motor drive board.

[0018] Figure 3 yes Figure 2 Enlarged view of part A.

[0019] Figure 4 yes Figure 2 Magnified view of part B.

[0020] Figure 5 The utility model discloses a driver chip circuit diagram of an anti-interference motor driver board. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] like Figure 1-5 As shown, this embodiment discloses an anti-interference motor driver board, which can shield high and low frequency electromagnetic signals and magnetic field interference in the circuit. A driver circuit is provided on the driver board, and the driver circuit drives the DC motor to operate; the driver circuit includes a switching circuit, a driver chip and a Hall sensor. The Hall sensor collects the position signal of the rotor and outputs it to the driver chip. The driver chip operates and outputs a signal to the switching circuit to control the switching device in the switching circuit to turn on and off and drive the DC motor to operate.

[0023] like Figure 2 、 Figure 3 As shown, the switching circuit includes a protection circuit and a switching device. The protection circuit includes an electronic fuse F1, filter capacitors C1 and C2, a transient voltage suppressor diode TVS1, and a Y capacitor CY; the electronic fuse F1 is connected in series with the switching circuit, and the electronic fuse F1 is connected to the DC power supply to prevent excessive current from burning the chip. The filter capacitors C1 and C2 are respectively connected in parallel with the switching circuit, and the filter capacitors C1 and C2 filter and stabilize the input signal for the input DC power supply. The transient voltage suppressor diode TVS1 is connected in series with the switching circuit, and the transient voltage suppressor diode TVS1 provides surge protection for the switching circuit.

[0024] The switching device includes complementary field-effect transistors Q1, Q2, and Q3. The complementary field-effect transistors Q1, Q2, and Q3 form a three-phase inverter bridge with an upper bridge arm and a lower bridge arm. The first input points of the complementary field-effect transistors Q1, Q2, and Q3 are respectively connected to the protection circuit, and the output points of the complementary field-effect transistors Q1, Q2, and Q3 are respectively used as output terminals for connecting to the U phase, V phase, and W phase of the DC motor. The second input points of the complementary field-effect transistors Q1, Q2, and Q3 are respectively connected to a common point ISN1, and the common point ISN1 is connected to the ground point GND. Several resistors are connected between the common point ISN1 and the ground point GND. The resistance value is 0, which can enhance anti-interference performance in a high-frequency environment; the complementary field-effect transistor Q2 is connected in parallel with a capacitor C9, and the complementary field-effect transistor Q3 is connected in parallel with a diode Z3.

[0025] like Figure 4As shown, in this example, the drains D1 and D2 of the complementary field effect transistor Q1 serve as the output terminal P1, which is connected to the U phase of the DC motor; the base G1 of the complementary field effect transistor Q1 serves as the control terminal to input the low-level signal LOU output by the microcontroller U1 to turn on the lower arm of the complementary field effect transistor Q1, and the base G2 of the complementary field effect transistor Q1 serves as the control terminal to input the high-level signal HOU output by the microcontroller to turn on the upper arm of the complementary field effect transistor Q1; the source S1 of the complementary field effect transistor Q1 is connected to the common point ISN1, which is connected to the ground point GND; resistors R27, R28 and R27A, R28A are connected between the common point ISN1 and the ground point GND, and the resistors R27, R28 and R27A, R28A are all zero-resistance resistors; a resistor R5 and a capacitor C6 are connected in parallel between the source S1 and the base G1, and a resistor R2 and a capacitor C3 are connected in parallel between the source S2 and the base G2.

[0026] In this example, the complementary field-effect transistors Q1, Q2, and Q3 are all IM4712 / PDFN-8 / 5X6.

[0027] In this example, the circuit configuration of complementary field effect transistors Q2 and Q3 is the same as that of Q1 and will not be described in detail.

[0028] In this embodiment, the driving chip is a single chip microcomputer U1, the single chip microcomputer U1 model is IU6332, and IU6332 has 28 pins, such as Figure 5 As shown, pin 3 is the power pin of microcontroller U1, connected to a 5V DC voltage. Pin 2 is the negative pin of microcontroller U1, connected to ground. Pins 23 and 24 connect to interface P4 for data transmission during program burning. Pins 25, 26, and 27 serve as input pins, and are connected to Hall effect sensors, respectively. Pins 13, 14, 16, 17, 18, and 19 serve as output pins for outputting control signals. Pins 14, 16, and 19 output high-level signals, while pins 13, 17, and 18 output low-level signals. Pin 1 outputs a signal to regulate the DC motor's speed. Microcontroller U1 can be used for VSP speed regulation or PWM speed regulation.

[0029] In this embodiment, the Hall sensors include a first Hall sensor, a second Hall sensor and a third Hall sensor. The first Hall sensor, the second Hall sensor and the third Hall sensor are respectively arranged on the driving board facing the motor rotor. The power supply end of the first Hall sensor is connected to a 5V DC power supply, the output end of the first Hall sensor is connected to pin 25 of the microcontroller U1, the ground end of the first Hall sensor is connected to the ground point, the power supply end of the first Hall sensor and the ground point are connected to capacitor C28, and the power supply end of the first Hall sensor and the ground point are connected to capacitor C25. The first Hall sensor locates the motor rotor and transmits the position signal to the microcontroller U1; the second Hall sensor and the third Hall sensor are similar. The U, V, and W three-phase Hall sensors detect the position of the motor rotor and convert it into a signal to transmit to the microcontroller U1. The microcontroller U1 uses the FOC algorithm to control the operation of the motor, which can realize the starting of loads of different sizes and forward and reverse operation.

[0030] In this embodiment, vector control code is recorded in the single-chip microcomputer U1. The single-chip microcomputer U1 receives the position signal of the Hall sensor and outputs a control signal to the three-phase inverter bridge in the switching circuit, so that the three-phase inverter bridge outputs current to drive the DC motor to rotate.

[0031] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. An anti-interference motor drive board, the drive board is provided with a drive circuit, characterized in that: The drive circuit includes a switching circuit, a drive chip and a Hall sensor. The switching circuit includes a protection circuit and a switching device. The switching circuit is provided with an electronic fuse F1, a filter capacitor C1, a transient voltage suppression diode TVS1 and a Y capacitor CY. The electronic fuse F1 is connected in series with a DC power supply VDC. The filter capacitor C1 and the transient voltage suppression diode TVS1 are respectively connected in parallel in the switching circuit. The Y capacitor CY is connected to the three-phase neutral line of the motor and is grounded.

2. The anti-interference motor drive board according to claim 1, characterized in that: The device further includes a filter capacitor C2, which is connected in parallel with the filter capacitor C1.

3. The anti-interference motor drive board according to claim 1, characterized in that: The switching device includes a complementary field effect transistor Q1, a complementary field effect transistor Q2, and a complementary field effect transistor Q3. The complementary field effect transistors Q1, Q2, and Q3 are connected in parallel to form a three-phase inverter bridge.

4. The anti-interference motor drive board according to claim 3, characterized in that: The drains D1 and D2 of the complementary field effect transistor Q1 are connected to the U phase of the DC motor.

5. The anti-interference motor drive board according to claim 4, characterized in that: The base G1 of the complementary field effect transistor Q1 is connected to the driver chip U1 to input a low level signal LOU, and the base G2 of the complementary field effect transistor Q1 is connected to the driver chip U1 to input a high level signal HOU.

6. The anti-interference motor drive board according to claim 5, characterized in that: The source S1 of the complementary field effect transistor Q1 is connected to the power supply terminal, the source S2 of the complementary field effect transistor Q1 is connected to the cathode terminal, and the cathode terminal is grounded.

7. The anti-interference motor drive board according to claim 6, characterized in that: A resistor R5 and a capacitor C6 are connected in parallel between the source S1 and the base G1 of the complementary field effect transistor Q1 , and a resistor R2 and a capacitor C3 are connected in parallel between the source S2 and the base G2 of the complementary field effect transistor Q1 .

8. The anti-interference motor drive board according to claim 3, characterized in that: The complementary field effect transistors Q1, Q2, and Q3 are all of model IM4712 / PDFN-8 / 5X6.

9. The anti-interference motor drive board according to claim 1, characterized in that: The driving chip is a single chip microcomputer U1, the model of the single chip microcomputer U1 is IU6332, the single chip microcomputer U1 is connected to complementary field effect transistors Q1, Q2, Q3, and the single chip microcomputer U1 is connected to a first Hall sensor, a second Hall sensor, and a third Hall sensor.

10. The anti-interference motor drive board according to claim 9, characterized in that: The power supply terminal of the first Hall sensor is connected to a 5V DC power supply, and the output terminal of the first Hall sensor is connected to the pin 25 of the single chip microcomputer U1.

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