Motor Hall signal acquisition circuit and motor control system

Abstract

The utility model discloses a motor Hall signal acquisition circuit and a motor control system. The problem that a Hall grounding wire harness increases the weight of a vehicle body is solved. The output end of the driving circuit is connected with the motor to form a loop when the motor works normally; the number of the diodes corresponds to the number of the output ends of the driving circuits, the output end of each driving circuit is connected with one diode, it is ensured that in a current loop in any direction, one diode is connected to the ground potential of the driving circuit, that is, the Hall chip is grounded, the Hall chip does not need a special grounding wire harness, and therefore the Hall chip is not damaged. The number of connector pins is reduced by adopting a mode of saving Hall ground wires, and the weight of wire harnesses is reduced, so that the weight of a vehicle body is reduced, and the cost of the whole vehicle is reduced.

Description

Technical Field

[0001] This application relates to the field of electronic equipment, and in particular to a motor Hall signal acquisition circuit and a motor control system. Background Technology

[0002] In modern automobiles, Hall effect sensors are commonly used to measure and monitor various parameters such as position, speed, and current. Currently, brushed motors generally use two-wire or three-wire Hall effect signal acquisition, while brushless motors use five-wire Hall effect signal acquisition.

[0003] Figure 1 This is a schematic diagram of a two-wire acquisition method for Hall signals from a brushed motor, as shown below. Figure 1 As shown, a two-wire acquisition method typically consists of two pins: a ground pin and a power and signal pins. The ground pin connects the Hall sensor to the ground; the power and signal pins connect the Hall sensor to the vehicle's signal receiving and control module, enabling power supply and signal transmission.

[0004] Figure 2 This is a schematic diagram of a three-wire acquisition method for Hall signals from a brushed motor, as shown below. Figure 2 As shown, a three-wire acquisition method typically consists of three pins: a power supply pin, a signal pin, and a ground pin. The power supply pin connects the Hall sensor to the vehicle's power system. The signal pin connects the Hall sensor to the vehicle's signal receiving and control module. The ground pin grounds the Hall sensor.

[0005] In brushless motors, Figure 3 This is a schematic diagram of a brushless motor Hall signal acquisition method, as shown below. Figure 3 As shown, the system includes power supply pins and ground pins, with the number of signal pins increased to three. Hall effect grounding harnesses are typically made of copper or aluminum, and the harness adds to the vehicle's weight.

[0006] Therefore, how to save Hall effect ground wires to reduce the weight of the wiring harness and thus the vehicle body is a technical problem that urgently needs to be solved by those in the field. Utility Model Content

[0007] The purpose of this application is to provide a motor Hall signal acquisition circuit and a motor control system to solve the problem that the Hall grounding harness increases the vehicle's weight.

[0008] To solve the above-mentioned technical problems, this application provides a motor Hall signal acquisition circuit, including: a control module, a drive circuit, a motor, a Hall chip, and multiple diodes;

[0009] The output terminal of the control module is connected to the input terminal of the drive circuit, and the output terminal of the drive circuit is connected to the motor.

[0010] The number of diodes corresponds to the number of output terminals of the driving circuit. Each output terminal of the driving circuit is connected to the negative terminal of one of the diodes, and the positive terminals of all the diodes are connected to the ground pin of the Hall chip. The power supply pin and signal pin of the Hall chip are connected to the control module.

[0011] As an optional solution, in the above-mentioned motor Hall signal acquisition circuit, the motor is a brushed motor; the driving circuit is an H-bridge driving circuit; and the number of diodes is two, including: a first diode and a second diode.

[0012] The first output terminal of the H-bridge drive circuit is connected to the first terminal of the brushed motor; the second output terminal of the H-bridge drive circuit is connected to the second terminal of the brushed motor.

[0013] The first output terminal of the H-bridge drive circuit is connected to the negative terminal of the first diode; the positive terminal of the first diode is connected to the ground pin of the Hall chip; the second output terminal of the H-bridge drive circuit is connected to the negative terminal of the second diode; and the positive terminal of the second diode is connected to the ground pin of the Hall chip.

[0014] As an optional solution, in the above-mentioned motor Hall signal acquisition circuit, the motor is a brushless motor; the drive circuit is a three-phase full-bridge drive circuit; and the number of diodes is three, including: a third diode, a fourth diode, and a fifth diode.

[0015] The first output terminal of the three-phase full-bridge drive circuit is connected to the U-phase winding of the brushless motor; the second output terminal of the three-phase full-bridge drive circuit is connected to the V-phase winding of the brushless motor; and the third output terminal of the three-phase full-bridge drive circuit is connected to the W-phase winding of the brushless motor.

[0016] The first output terminal of the three-phase full-bridge drive circuit is connected to the negative terminal of the third diode; the second output terminal of the three-phase full-bridge drive circuit is connected to the negative terminal of the fourth diode; the third output terminal of the three-phase full-bridge drive circuit is connected to the negative terminal of the fifth diode; the positive terminals of the third diode, the fourth diode, and the fifth diode are connected to the ground pin of the Hall chip.

[0017] As an optional solution, in the above-mentioned motor Hall signal acquisition circuit, the control module includes: a Hall signal conditioning circuit and a controller;

[0018] The power supply pin and signal pin of the Hall chip are connected to the Hall signal conditioning circuit, and the Hall signal conditioning circuit is connected to the controller;

[0019] The Hall signal conditioning circuit receives and processes the Hall signal sent by the Hall chip, and sends the processing result to the controller.

[0020] As an optional solution, the above-mentioned motor Hall signal acquisition circuit also includes: a DC-DC conversion circuit;

[0021] The input terminal of the DC-DC converter circuit is connected to the power supply, and the output terminal of the DC-DC converter circuit is connected to the controller and the Hall signal conditioning circuit to supply power to the controller and the Hall signal conditioning circuit.

[0022] As an alternative, in the above-mentioned motor Hall signal acquisition circuit, the motor is a brushed motor, and the power supply pin and signal pin of the Hall chip are multiplexed and connected to the Hall signal conditioning circuit.

[0023] As an optional solution, in the above-mentioned motor Hall signal acquisition circuit, the motor is a brushless motor, and the Hall chip has three signal pins: a first Hall signal pin, a second Hall signal pin, and a third Hall signal pin.

[0024] The power supply pin, first Hall signal pin, second Hall signal pin, and third Hall signal pin of the Hall chip are respectively connected to the Hall signal conditioning circuit.

[0025] As an optional solution, the above-mentioned motor Hall signal acquisition circuit also includes: a low-dropout linear regulator;

[0026] The input terminal of the low-dropout linear regulator is connected to the power supply, and the output terminal of the low-dropout linear regulator is connected to the controller and the Hall signal conditioning circuit to supply power to the controller and the Hall signal conditioning circuit.

[0027] As an optional solution, in the above-mentioned motor Hall signal acquisition circuit, the Hall signal conditioning circuit includes: a comparator, a first resistor, a second resistor, and a third resistor;

[0028] The inverting input of the comparator is connected to the Hall chip, and the power supply port of the comparator is connected to the reference power supply; the non-inverting input of the comparator is connected to the first end of the second resistor and the first end of the third resistor, the second end of the second resistor is connected to the reference power supply, and the third resistor is grounded; the output of the comparator is connected to the power supply through the first resistor, and the output of the comparator is connected to the controller.

[0029] To solve the above-mentioned technical problems, this application also provides a motor control system, including the above-mentioned motor Hall signal acquisition circuit.

[0030] The motor Hall signal acquisition circuit provided in this application has a drive circuit output terminal connected to the motor, forming a loop during normal motor operation. The number of diodes corresponds to the number of drive circuit output terminals, with each drive circuit output terminal connected to a diode. This ensures that in any current loop, there is a diode connected to the drive circuit's ground potential, i.e., the Hall chip is grounded. Therefore, the Hall chip does not require a dedicated grounding harness. By using a method that saves Hall ground wires, the number of connector pins is reduced, the harness weight is reduced, thereby reducing the vehicle's weight and lowering the overall vehicle cost.

[0031] In addition, this application also provides a motor control system, which corresponds to the above-mentioned motor Hall signal acquisition circuit and has the same effect. Attached Figure Description

[0032] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a two-wire acquisition method for Hall signals from a brushed motor.

[0034] Figure 2 This is a schematic diagram of a three-wire acquisition method for Hall signals from a brushed motor.

[0035] Figure 3 This is a schematic diagram of a brushless motor Hall signal acquisition method;

[0036] Figure 4 A Hall signal acquisition circuit diagram for a brushed motor provided in this application embodiment;

[0037] Figure 5 A Hall signal acquisition circuit diagram for forward rotation of a brushed motor is provided in an embodiment of this application;

[0038] Figure 6 A Hall signal acquisition circuit diagram for brushed motor reversal is provided in an embodiment of this application;

[0039] Figure 7 A Hall signal acquisition circuit diagram for a brushless motor provided in this application embodiment;

[0040] Figure 8 A Hall signal acquisition circuit diagram for UV phase energization of a brushless motor provided in this application embodiment;

[0041] Figure 9 A Hall signal acquisition circuit diagram for UV phase energization of a brushless motor provided in this application embodiment;

[0042] Figure 10 A Hall signal acquisition circuit diagram for UV phase energization of a brushless motor provided in this application embodiment;

[0043] Figure 11 A circuit diagram of a Hall signal conditioning circuit provided in an embodiment of this application. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0045] The core of this application is to provide a motor Hall signal acquisition circuit and a motor control system.

[0046] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] To address the aforementioned issues, this application provides a motor Hall signal acquisition circuit, comprising: a control module, a drive circuit, a motor, a Hall chip, and multiple diodes;

[0048] The output of the control module is connected to the input of the drive circuit, and the output of the drive circuit is connected to the motor.

[0049] The number of diodes corresponds to the number of output terminals of the drive circuit. Each output terminal of the drive circuit is connected to the negative terminal of a diode, and the positive terminals of all diodes are connected to the ground pin of the Hall chip. The power supply pin and signal pin of the Hall chip are connected to the control module.

[0050] The motor Hall signal acquisition circuit of this embodiment is particularly suitable for brushed and brushless motor control applications requiring precise feedback on motor operating status, especially in automotive motor control systems. This circuit can effectively reduce the number of connector pins, lighten wiring harness weight, thereby reducing vehicle weight and lowering costs.

[0051] The control module is mainly responsible for receiving and processing signals from the Hall chip, and controlling the operation of the motor through the drive circuit.

[0052] The drive circuit can be a half-bridge drive circuit or a three-phase bridge drive circuit, depending on the type of motor. The drive circuit drives the motor to rotate forward and reverse or energize different phases according to the instructions from the control module.

[0053] Hall effect chips are used to sense changes in the magnetic field of a motor, generate Hall signals, and provide feedback on the motor's operating status.

[0054] The number of diodes corresponds to the number of output terminals of the drive circuit, with each output terminal connected to the negative terminal of a diode. The unidirectional conductivity of the diodes enables a loop connection for the Hall chip's ground pin, thus eliminating the need for a dedicated ground wire.

[0055] Specifically, the control module changes the switching state of the insulated-gate field-effect transistor (MOSFET) through the drive circuit, thereby changing the current flow and realizing the forward and reverse rotation of the motor. During this process, diodes ensure that the Hall chip can correctly form a loop through the motor wiring harness and output a Hall signal. Taking forward rotation as an example, the loop refers to the current flowing from the power supply through the drive circuit, to the first input terminal of the motor, to the second output terminal, and then back to ground through the drive circuit. Simultaneously, since the output terminal of each drive circuit is connected to a diode, it ensures that in any current loop in either direction, there is a diode connected to the ground terminal of the drive circuit.

[0056] Similarly, for brushless motors, the energization of different phases is controlled by a three-phase bridge drive circuit, and diodes also ensure the circuit connection of the Hall chip and connect it to the ground terminal of the drive circuit.

[0057] The motor Hall signal acquisition circuit provided in this application embodiment connects the output of the drive circuit to the motor, forming a loop during normal motor operation. The number of diodes corresponds to the number of outputs of the drive circuit. Each output of the drive circuit is connected to a diode, ensuring that in any current loop, there is a diode connected to the ground potential of the drive circuit, i.e., the Hall chip is grounded. Therefore, the Hall chip does not require a dedicated grounding harness. By using a method that saves Hall ground wires, the number of connector pins is reduced, the harness weight is reduced, thereby reducing the vehicle body weight and lowering the overall vehicle cost.

[0058] According to the above embodiments, in one specific embodiment, it is used for an automotive motor control system that requires precise control of the brushed motor's operating state. Specifically, Figure 4 A Hall signal acquisition circuit diagram for a brushed motor is provided as an embodiment of this application, such as... Figure 4 As shown, the motor is a brushed motor M1; the drive circuit is an H-bridge drive circuit 11; there are two diodes, including: a first diode D1 and a second diode D2.

[0059] The first output terminal of the H-bridge drive circuit 11 is connected to the first terminal of the brushed motor M1; the second output terminal of the H-bridge drive circuit 11 is connected to the second terminal of the brushed motor M1.

[0060] The first output terminal of the H-bridge drive circuit 11 is connected to the negative terminal of the first diode D1; the positive terminal of the first diode D1 is connected to the ground pin of the Hall chip; the second output terminal of the H-bridge drive circuit 11 is connected to the negative terminal of the second diode D2; and the positive terminal of the second diode D2 is connected to the ground pin of the Hall chip.

[0061] like Figure 4 As shown, the H-bridge drive circuit 11 includes four N-channel MOSFETs (first MOSFET Q1, second MOSFET Q2, third MOSFET Q3, and fourth MOSFET Q4). The control module controls the forward and reverse rotation of the brushed motor M1 by controlling the switching states of the MOSFETs.

[0062] In one feasible solution, the control module includes a Hall signal conditioning circuit and a controller. The controller includes a main control chip and a half-bridge drive circuit. The main control chip drives the transistors of the H-bridge drive circuit 11 to turn on and off through the half-bridge drive circuit.

[0063] Figure 5 A Hall signal acquisition circuit diagram for forward rotation of a brushed motor M1 is provided in an embodiment of this application, as shown below. Figure 6 As shown, when the motor rotates forward: the half-bridge drive circuit drives the first MOSFET Q1 and the fourth MOSFET Q4 to turn on. At this time, current flows through Q1, the motor harness + flows into the brushed motor M1, flows out of the motor harness -, and then back to the ground terminal through Q4, causing the motor to rotate forward. The drain of Q4 is approximately 0V. The Hall chip is connected to the motor harness - and the fourth MOSFET Q4 through the second diode D2 to form a circuit (e.g., ...). Figure 5 (Red path) At this time, the link composed of the second diode D2, the motor harness, and the fourth MOSFET Q4 acts as the ground wire of the Hall circuit, and the Hall circuit works normally.

[0064] Figure 6 A Hall signal acquisition circuit diagram for reversing a brushed motor M1 is provided as an embodiment of this application, as follows: Figure 6 As shown, the motor reverses: the half-bridge drive circuit drives the second MOSFET Q2 and the third MOSFET Q3 to turn on. At this time, current flows through the second MOSFET Q2, into the brushed DC motor from the motor harness -, out of the motor harness +, and back to ground through the third MOSFET Q3, thus reversing the motor. The drain of the third MOSFET Q3 is approximately 0V. The Hall chip is connected to the motor harness + and the third MOSFET Q3 through the first diode D1 to form a circuit (e.g., ...). Figure 6 (Green path), at this time the link composed of the first diode D1, the motor harness + and the third MOSFET Q3 acts as the ground wire of the Hall circuit, and the Hall circuit works normally.

[0065] The embodiments provided in this application demonstrate a Hall signal acquisition method for the brushed motor M1 of an automobile that omits the ground wire.

[0066] According to the above embodiments, in one specific embodiment, the motor is a brushless motor M2; Figure 7 A Hall signal acquisition circuit diagram for a brushless motor M2 provided in this application embodiment; as shown Figure 7 As shown, the driving circuit is a three-phase full-bridge driving circuit 12; the number of diodes is three, including: the third diode D3, the fourth diode D4, and the fifth diode D5;

[0067] The first output terminal of the three-phase full-bridge drive circuit 12 is connected to the U-phase winding of the brushless motor M2; the second output terminal of the three-phase full-bridge drive circuit 12 is connected to the V-phase winding of the brushless motor M2; and the third output terminal of the three-phase full-bridge drive circuit 12 is connected to the W-phase winding of the brushless motor M2.

[0068] The first output terminal of the three-phase full-bridge drive circuit 12 is connected to the negative terminal of the third diode D3; the second output terminal of the three-phase full-bridge drive circuit 12 is connected to the negative terminal of the fourth diode D4; the third output terminal of the three-phase full-bridge drive circuit 12 is connected to the negative terminal of the fifth diode D5; the positive terminals of the third diode D3, the fourth diode D4, and the fifth diode D5 are connected to the ground pin of the Hall chip.

[0069] The brushless motor M2 has three windings: U, V, and W phase windings. For example... Figure 7 As shown, the three-phase full-bridge drive circuit 12 includes six N-channel MOSFETs (MOSFET Q5, MOSFET Q6, MOSFET Q7, MOSFET Q8, MOSFET Q9, and MOSFET Q10). It mainly controls the motor speed by controlling the output voltage changes through different duty cycles of the PWM signal.

[0070] In one feasible solution, the control module includes a Hall signal conditioning circuit and a controller. The controller includes a main control chip and a three-phase bridge drive chip. The main control chip outputs a PWM signal through the three-phase bridge drive chip to control the conduction and cutoff of each transistor in the three-phase full-bridge drive circuit 12.

[0071] Figure 8 This application provides a circuit diagram for acquiring Hall signals when the brushless motor M2UV phase is energized; as shown in the embodiment of this application. Figure 8As shown, when the UV phase is energized: the three-phase bridge driver chip drives the ninth MOSFET Q9 and the eighth MOSFET Q8 to turn on. At this time, current flows through the ninth MOSFET Q9, the motor harness U flows into the brushless motor M2, flows out of the motor harness V, and then returns to ground through the eighth MOSFET Q8. The drain of the eighth MOSFET Q8 is approximately 0V. The Hall circuit is connected to the motor harness V and the eighth MOSFET Q8 through the fourth diode D4 to form a loop. At this time, the link formed by the fourth diode D4, the motor harness V, and the eighth MOSFET Q8 acts as the ground wire of the Hall circuit, and the Hall circuit works normally.

[0072] Figure 9 This application provides a circuit diagram for acquiring Hall signals when the brushless motor M2UV phase is energized; as shown in the embodiment of this application. Figure 9 As shown, when phases V and W are energized: the three-phase bridge driver chip drives the seventh MOSFET Q7 and the sixth MOSFET Q6 to turn on. At this time, current flows through the seventh MOSFET Q7, the motor harness V flows into the brushless motor M2, flows out of the motor harness W, and then back to ground through the sixth MOSFET Q6. The drain of the sixth MOSFET Q6 is approximately 0V. The Hall circuit is connected to the motor harness W and the sixth MOSFET Q6 through the fifth diode D5 to form a loop. At this time, the link formed by the fifth diode D5, the motor harness W, and the sixth MOSFET Q6 acts as the ground wire of the Hall circuit, and the Hall circuit works normally.

[0073] Figure 10 This application provides a circuit diagram for acquiring Hall signals when the brushless motor M2UV phase is energized; as shown in the embodiment of this application. Figure 10 As shown, when phases U and W are energized: the three-phase bridge driver chip drives the fifth MOSFET Q5 and the tenth MOSFET Q10 to turn on. At this time, current flows through the fifth MOSFET Q5, the motor harness W flows into the brushless DC motor, flows out of the motor harness U, and then back to ground through the tenth MOSFET Q10. The drain of the tenth MOSFET Q10 is approximately 0V. The Hall circuit is connected to the motor harness U and the tenth MOSFET Q10 through the third diode D3 to form a loop. At this time, the link formed by the third diode D3, the motor harness U, and the tenth MOSFET Q10 acts as the ground wire of the Hall circuit, and the Hall circuit works normally.

[0074] The embodiments provided in this application enable a design that omits the ground wire in the brushless motor M2 of an automobile, further reducing the weight of the wiring harness and the vehicle body.

[0075] According to the above embodiments, in one specific embodiment, the control module includes: a Hall signal conditioning circuit 13 and a controller;

[0076] The power supply pins and signal pins of the Hall chip are connected to the Hall signal conditioning circuit 13, and the Hall signal conditioning circuit 13 is connected to the controller.

[0077] The Hall signal conditioning circuit 13 receives and processes the Hall signal sent by the Hall chip, and sends the processing result to the controller.

[0078] A Hall position signal processing circuit is a circuit used to process the voltage signal generated by a Hall element. Its function is to eliminate rotational frequency noise and improve the signal-to-noise ratio and accuracy of the signal.

[0079] According to the above embodiments, in one specific embodiment, it further includes: a DC-DC conversion circuit;

[0080] The input terminal of the DC-DC converter is connected to the power supply, and the output terminal of the DC-DC converter is connected to the controller and the Hall signal conditioning circuit 13 to supply power to the controller and the Hall signal conditioning circuit 13.

[0081] This embodiment uses a DC-DC converter circuit to step down and isolate the power supply voltage, providing a stable operating voltage for the controller and the Hall signal conditioning circuit 13.

[0082] The circuit primarily employs a buck converter topology, with an input capacitor filtering out high-frequency power supply noise, and a power switch paired with a freewheeling diode to achieve energy conversion. This embodiment does not limit the specific circuit structure; it can be designed according to actual needs.

[0083] According to the above embodiments, in a specific embodiment, when the motor is a brushed motor M1, the power supply pin and signal pin of the Hall chip are multiplexed and connected to the Hall signal conditioning circuit 13.

[0084] like Figure 4 As shown, the power supply pins and signal pins of the Hall chip are multiplexed, reducing the number of connector pins and wiring complexity.

[0085] According to the above embodiments, in a specific embodiment, when the motor is a brushless motor M2, the number of signal pins of the Hall chip is 3: a first Hall signal pin, a second Hall signal pin, and a third Hall signal pin;

[0086] The power supply pin, first Hall signal pin, second Hall signal pin, and third Hall signal pin of the Hall chip are respectively connected to the Hall signal conditioning circuit 13.

[0087] like Figure 7 As shown, the power supply pin, first Hall signal pin, second Hall signal pin, and third Hall signal pin of the Hall chip are respectively connected to the Hall signal conditioning circuit 13. Dedicated ports can provide higher signal transmission rates or more stable power supplies, avoiding performance losses caused by multiplexing. This reduces interference and improves the stability and reliability of the system.

[0088] According to the above embodiments, in one specific embodiment, it further includes: a low-dropout linear regulator;

[0089] The input terminal of the low-dropout linear regulator is connected to the power supply, and the output terminal of the low-dropout linear regulator is connected to the controller and the Hall signal conditioning circuit 13 to supply power to the controller and the Hall signal conditioning circuit 13.

[0090] This embodiment is applicable to the brushless motor M2 control system, which requires a stable low-voltage power supply despite large input power fluctuations. A low-dropout regulator (LDO), also known as a low-dropout linear regulator or low-voltage-drop regulator, is a type of linear DC regulator, also used to provide a stable DC voltage power supply. Compared to a typical linear DC regulator, a low-dropout regulator can operate with a smaller output-input voltage difference.

[0091] The low-dropout linear regulator (LDO) provides a low-noise power supply for the controller and Hall signal conditioning circuit 13.

[0092] According to the above embodiments, in one specific embodiment... Figure 11 A circuit diagram of a Hall signal conditioning circuit 13 provided in an embodiment of this application is shown below. Figure 11 As shown, the Hall signal conditioning circuit 13 includes: a comparator U1, a first resistor R1, a second resistor R2, and a third resistor R3;

[0093] The inverting input of comparator U1 is connected to the Hall chip, and the power supply port of comparator U1 is connected to the reference power supply Vhall; the non-inverting input of comparator U1 is connected to the first end of the second resistor R2 and the first end of the third resistor R3, the second end of the second resistor R2 is connected to the reference power supply, and the third resistor R3 is grounded; the output of comparator U1 is connected to the power supply VCC through the first resistor R1, and the output of comparator U1 is connected to the controller.

[0094] The first resistor R1 is connected to the power supply at one end and to the output of comparator U1 at the other end, serving as a pull-up resistor to ensure that the output of comparator U1 can output stably when it is at a high level.

[0095] The second resistor R2 and the third resistor R3 are of equal value. The second resistor R2 and the third resistor R3 are connected in series to form a voltage divider circuit. After voltage division, the voltage is Vhall / 2, which is used by comparator U1 for comparison.

[0096] If the Hall signal level is lower than Vhall / 2, the comparator U1 outputs a high level, and the controller recognizes the high-level signal. If the Hall signal level is higher than Vhall / 2, the comparator U1 outputs a low level, and the controller recognizes the low-level signal.

[0097] Finally, this application provides a motor control system including the aforementioned motor Hall signal acquisition circuit. The output terminal of the drive circuit is connected to the motor, forming a loop during normal motor operation. The number of diodes corresponds to the number of output terminals of the drive circuit, with each output terminal of the drive circuit connected to a diode. This ensures that in any current loop in any direction, there is a diode connected to the ground potential of the drive circuit, i.e., the Hall chip is grounded. Therefore, the Hall chip does not require a dedicated grounding harness. By using a method that saves Hall ground wires, the number of connector pins is reduced, the harness weight is reduced, thereby reducing the vehicle body weight and lowering the overall vehicle cost.

[0098] The foregoing provides a detailed description of the motor Hall signal acquisition circuit and motor control system provided in this application. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0099] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A motor Hall signal acquisition circuit, characterized in that, include: Control module, drive circuit, motor, Hall effect chip, multiple diodes; The output terminal of the control module is connected to the input terminal of the drive circuit, and the output terminal of the drive circuit is connected to the motor. The number of diodes corresponds to the number of output terminals of the driving circuit. Each output terminal of the driving circuit is connected to the negative terminal of one of the diodes, and the positive terminals of all the diodes are connected to the ground pin of the Hall chip. The power supply pin and signal pin of the Hall chip are connected to the control module.

2. The motor Hall signal acquisition circuit according to claim 1, characterized in that, The motor is a brushed motor; the drive circuit is an H-bridge drive circuit; the number of diodes is two, including: a first diode and a second diode; The first output terminal of the H-bridge drive circuit is connected to the first terminal of the brushed motor; the second output terminal of the H-bridge drive circuit is connected to the second terminal of the brushed motor. The first output terminal of the H-bridge drive circuit is connected to the negative terminal of the first diode; the positive terminal of the first diode is connected to the ground pin of the Hall chip; the second output terminal of the H-bridge drive circuit is connected to the negative terminal of the second diode; and the positive terminal of the second diode is connected to the ground pin of the Hall chip.

3. The motor Hall signal acquisition circuit according to claim 1, characterized in that, The motor is a brushless motor; the drive circuit is a three-phase full-bridge drive circuit. The number of diodes is three, including: a third diode, a fourth diode, and a fifth diode; The first output terminal of the three-phase full-bridge drive circuit is connected to the U-phase winding of the brushless motor; the second output terminal of the three-phase full-bridge drive circuit is connected to the V-phase winding of the brushless motor; and the third output terminal of the three-phase full-bridge drive circuit is connected to the W-phase winding of the brushless motor. The first output terminal of the three-phase full-bridge drive circuit is connected to the negative terminal of the third diode; the second output terminal of the three-phase full-bridge drive circuit is connected to the negative terminal of the fourth diode; the third output terminal of the three-phase full-bridge drive circuit is connected to the negative terminal of the fifth diode; the positive terminals of the third diode, the fourth diode, and the fifth diode are connected to the ground pin of the Hall chip.

4. The motor Hall signal acquisition circuit according to claim 1, characterized in that, The control module includes: a Hall signal conditioning circuit and a controller; The power supply pin and signal pin of the Hall chip are connected to the Hall signal conditioning circuit, and the Hall signal conditioning circuit is connected to the controller; The Hall signal conditioning circuit receives and processes the Hall signal sent by the Hall chip, and sends the processing result to the controller.

5. The motor Hall signal acquisition circuit according to claim 4, characterized in that, Also includes: DC-DC conversion circuit; The input terminal of the DC-DC converter circuit is connected to the power supply, and the output terminal of the DC-DC converter circuit is connected to the controller and the Hall signal conditioning circuit to supply power to the controller and the Hall signal conditioning circuit.

6. The motor Hall signal acquisition circuit according to claim 4, characterized in that, The motor is a brushed motor, and the power supply pins and signal pins of the Hall chip are multiplexed and connected to the Hall signal conditioning circuit.

7. The motor Hall signal acquisition circuit according to claim 4, characterized in that, The motor is a brushless motor, and the Hall chip has three signal pins: a first Hall signal pin, a second Hall signal pin, and a third Hall signal pin. The power supply pin, first Hall signal pin, second Hall signal pin, and third Hall signal pin of the Hall chip are respectively connected to the Hall signal conditioning circuit.

8. The motor Hall signal acquisition circuit according to claim 4, characterized in that, Also includes: Low dropout linear regulator; The input terminal of the low-dropout linear regulator is connected to the power supply, and the output terminal of the low-dropout linear regulator is connected to the controller and the Hall signal conditioning circuit to supply power to the controller and the Hall signal conditioning circuit.

9. The motor Hall signal acquisition circuit according to any one of claims 4 to 8, characterized in that, The Hall signal conditioning circuit includes: a comparator, a first resistor, a second resistor, and a third resistor; The inverting input of the comparator is connected to the Hall chip, and the power supply port of the comparator is connected to the reference power supply; the non-inverting input of the comparator is connected to the first end of the second resistor and the first end of the third resistor, the second end of the second resistor is connected to the reference power supply, and the third resistor is grounded; the output of the comparator is connected to the power supply through the first resistor, and the output of the comparator is connected to the controller.

10. A motor control system, characterized in that, Includes the motor Hall signal acquisition circuit as described in any one of claims 1 to 9.

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