Duplex winding motor driving circuit, braking system and automobile

Abstract

The utility model provides a duplex-winding motor drive circuit, a brake system and an automobile, and relates to the technical field of duplex-winding motor control, the duplex-winding motor drive circuit comprises a first micro-control unit and a second micro-control unit which are in communication connection, the signal output end of the first micro-control unit is connected with the first input end of a gating module, and the signal output end of the second micro-control unit is connected with the second input end of the gating module; the signal output end of the second micro-control unit is connected with the second input end of the gating module, and the signal control end of the first micro-control unit is further connected with the gating signal end of the gating module. The output end of the gating module is connected with the first input end of the gating module or the second input end of the gating module; the output end of the gating module is connected with one winding of the motor through the A-path driving unit, and the output end of the gating module is further connected with the other winding of the motor through the B-path driving unit. According to the utility model, the problem that the overall performance of the system is still influenced when one MCU (Microprogrammed Control Unit) fails in the existing control system is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of dual-winding motor control, in particular to a dual-winding motor drive circuit, a braking system and a car. Background Art

[0002] With the development of intelligent vehicles and autonomous driving technology, the requirements for braking system response speed and safety levels are becoming increasingly stringent. Braking system performance is directly related to driving safety. Currently, most vehicles use electronic hydraulic braking systems. However, because these systems do not completely eliminate the hydraulic system, they suffer from complex structures, large overall dimensions, inconvenient installation, high maintenance costs, and slow braking response. In contrast, electromechanical braking systems (EMBs) can address these shortcomings.

[0003] In existing electromechanical brake systems (EMBs), for the control of dual-winding motors, reference can be made to Application No. 202110155001.3, "An Operating Method for a Dual-Winding Brushless DC Motor Redundant Control System," or Application No. 201610727518.4, "A Coordinated Control System for a Dual-Winding Permanent Magnet Synchronous Motor." Both utilize dual MCUs, dual drive circuits, dual-winding motors, and dual position detection to achieve redundant control of dual-winding motors.

[0004] However, in the above control system, one MCU corresponds to one drive circuit and one motor winding. Under this control mode, when one of the MCUs fails, even if the remaining winding of the motor can still be controlled by another MCU, it will still affect the overall performance of the system. Utility Model Content

[0005] In response to the deficiencies in the prior art, the present invention provides a dual-winding motor drive circuit, a braking system, and a vehicle, which solve the problem in existing control systems that, when one of the MCUs fails, the overall performance of the system is still affected.

[0006] At least one embodiment of the present utility model provides a dual-winding motor drive circuit, comprising: a gating module, an A-path drive unit, a B-path drive unit, and a first micro-control unit and a second micro-control unit communicatively connected to each other, wherein:

[0007] The signal output terminal of the first micro-control unit is connected to the first input terminal of the gating module, the signal output terminal of the second micro-control unit is connected to the second input terminal of the gating module, the signal control terminal of the first micro-control unit is further connected to the gating signal terminal of the gating module, and the gating module is configured to connect the output terminal of the gating module to the first input terminal of the gating module or the second input terminal of the gating module according to the level information received by the gating signal terminal thereof;

[0008] The output end of the gating module is connected to one of the windings of the motor through the A-path driving unit, and the output end of the gating module is also connected to the other winding of the motor through the B-path driving unit.

[0009] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0010] The first micro-control unit and the second micro-control unit communicate with each other to exchange data in real time. During normal operation, the first micro-control unit controls its signal control terminal to output a high level, so that the first input terminal of the strobe module is connected to the output terminal of the strobe module, and the signal output terminal of the first micro-control unit is connected to the A-channel drive unit and the B-channel drive unit through the strobe module, thereby controlling the operation of the two windings of the motor;

[0011] At this time, even if the first micro-control unit fails, the signal output terminal of the first micro-control unit is suspended or outputs a low level, and then the second input terminal of the strobe module is connected to the output terminal of the strobe module, so that the signal output terminal of the second micro-control unit is connected to the A-channel drive unit and the B-channel drive unit to control the operation of the two windings of the motor;

[0012] During the above control process, the two windings of the motor are always in working state, and one of the windings will not stop working due to a failure of the first micro-control unit, which greatly improves the overall performance stability of the motor system.

[0013] In a dual-winding motor drive circuit provided in one embodiment of the present invention, the gating module includes a first multi-way switch and a second multi-way switch, wherein:

[0014] The signal output terminal of the first micro-control unit is connected to the first input terminal of the first multi-way switch and the first input terminal of the second multi-way switch respectively, the signal output terminal of the second micro-control unit is connected to the second input terminal of the first multi-way switch and the second input terminal of the second multi-way switch respectively, and the signal control terminal of the first micro-control unit is connected to the selection signal terminal of the first multi-way switch and the selection signal terminal of the second multi-way switch respectively;

[0015] The first multi-way switch is configured to connect the output end of the first multi-way switch to the first input end of the first multi-way switch or the second input end of the first multi-way switch according to the level information received at its selection signal end, and the second multi-way switch is configured to connect the output end of the second multi-way switch to the first input end of the second multi-way switch or the second input end of the second multi-way switch according to the level information received at its selection signal end.

[0016] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0017] In the above structure, the first micro-control unit can simultaneously control the A-way drive unit and the B-way drive unit through the first multi-way switch and the second multi-way switch, and the second micro-control unit can also simultaneously control the A-way drive unit and the B-way drive unit through the first multi-way switch and the second multi-way switch.

[0018] In a dual-winding motor drive circuit provided by one embodiment of the present invention, the A-path drive unit includes an A-path pre-drive IC and an A-path three-phase full-bridge, and the B-path drive unit includes a B-path pre-drive IC and a B-path three-phase full-bridge, wherein:

[0019] The output end of the first multi-way switch passes through the A-way pre-driver IC and the A-way three-phase full-bridge in sequence until it is connected to one of the windings of the motor;

[0020] The output end of the second multi-way switch passes through the B-way pre-driver IC and the B-way three-phase full-bridge in sequence until it is connected to the other winding of the motor.

[0021] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0022] The first micro-control unit and the second micro-control unit can control the A-way pre-driver IC and the B-way pre-driver IC to send PWM modulation signals. After passing through the A-way three-phase full-bridge or the B-way three-phase full-bridge, the signal can control the three phases of the motor winding.

[0023] In a dual-winding motor drive circuit provided by one embodiment of the present invention, a signal acquisition terminal of the A-way pre-driver IC is connected to multiple bridge arms of the A-way three-phase full bridge, and the A-way pre-driver IC is configured to determine whether the A-way three-phase full bridge is faulty based on at least two differential signals acquired between the bridge arms of the A-way three-phase full bridge;

[0024] The signal acquisition end of the B-path pre-driver IC is connected to the bridge arm of the B-path three-phase full bridge. The B-path pre-driver IC is configured to determine whether the B-path three-phase full bridge is faulty based on at least two differential signals collected between the bridge arms of the B-path three-phase full bridge.

[0025] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0026] By using the signal acquisition end of the A-channel pre-driver IC and the signal acquisition end of the B-channel pre-driver IC, the current at the corresponding position can be detected, and the status of the A-channel three-phase full-bridge and the B-channel three-phase full-bridge can be finally determined in real time to determine whether there is a fault.

[0027] In one embodiment of the present invention, a dual-winding motor drive circuit further includes: an A-phase cutoff module, an A-phase cutoff control module, a B-phase cutoff module, and a B-phase cutoff control module, wherein:

[0028] The A-path three-phase full-bridge sequentially passes through the input end and the output end of the A-path phase-cutoff module until it is connected to one of the windings of the motor. The control end of the A-path phase-cutoff module is connected to the control end of the A-path pre-driver IC via the A-path phase-cutoff control module. The A-path phase-cutoff module is configured to control the conduction between the input end and the output end of the A-path phase-cutoff module according to a level signal received by the control end of the A-path phase-cutoff module.

[0029] The B-path three-phase full-bridge sequentially passes through the input end and the output end of the B-path phase-cutoff module until it is connected to the other winding of the motor. The control end of the B-path phase-cutoff module is connected to the control end of the B-path pre-driver IC through the B-path phase-cutoff control module. The B-path phase-cutoff module is configured to control the conduction between the input end and the output end of the B-path phase-cutoff module based on a level signal received by the control end of the B-path phase-cutoff module.

[0030] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0031] When the A-channel pre-driver IC detects a fault in the A-channel three-phase full-bridge, it can control the A-channel phase-cutoff control module and send a corresponding level signal to the control end of the A-channel phase-cutoff module to disconnect the A-channel three-phase full-bridge from one of the motor windings to avoid affecting the normal operation of the other motor winding.

[0032] Similarly, when the B-channel pre-driver IC detects a B-channel three-phase full-bridge fault, it can control the B-channel phase-cutoff control module and send a corresponding level signal to the control end of the B-channel phase-cutoff module to disconnect the B-channel three-phase full-bridge from one of the motor windings, thereby avoiding affecting the normal operation of the other winding of the motor.

[0033] In one embodiment of the present invention, a dual-winding motor drive circuit further includes a temperature sensing module and a rotor position detection module, wherein:

[0034] The temperature sensing module is connected to the first micro-control unit and the second micro-control unit at the same time, and the temperature sensing module is used to detect the temperature of the A-path three-phase full-bridge and the B-path three-phase full-bridge;

[0035] The rotor position detection module is connected to the first micro-control unit and the second micro-control unit at the same time. The rotor position detection module is used to detect the rotation angles of the two rotors in the motor.

[0036] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0037] By detecting the temperature of the A-path three-phase full-bridge and the B-path three-phase full-bridge, as well as the position detection of the rotation angles of the two winding rotors, the status of whether the circuit is operating normally can be obtained in real time, and the position control of the rotation angle of the motor winding rotor can be facilitated.

[0038] In a dual-winding motor drive circuit provided by one embodiment of the present invention, the A-channel pre-driver IC is simultaneously connected to the first micro-control unit and the second micro-control unit to simultaneously transmit the single-ended current signal of the A-channel three-phase full-bridge arm to the first micro-control unit and the second micro-control unit;

[0039] The B-channel pre-driver IC is connected to the first micro-control unit and the second micro-control unit at the same time, so as to transmit the single-ended current signal of the B-channel three-phase full-bridge arm to the first micro-control unit and the second micro-control unit at the same time.

[0040] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0041] By sending the single-ended current signals of the bridge arms of the A-path three-phase full bridge and the B-path three-phase full bridge to the first micro-control unit and the second micro-control unit, active monitoring of the operating status of the A-path three-phase full bridge and the B-path three-phase full bridge can be achieved.

[0042] In a dual-winding motor drive circuit provided by one embodiment of the present invention, the A-channel pre-driver IC is further connected to the first micro-control unit and the second micro-control unit to simultaneously transmit information on whether the A-channel three-phase full-bridge is faulty to the first micro-control unit and the second micro-control unit;

[0043] The B-channel pre-driver IC is also connected to the first micro-control unit and the second micro-control unit to simultaneously transmit information on whether the B-channel three-phase full-bridge is faulty to the first micro-control unit and the second micro-control unit;

[0044] The first micro-control unit is also connected to the A-phase cut-off control module and the B-phase cut-off control module to control the conduction and disconnection of the A-phase cut-off module and / or the B-phase cut-off module based on at least one of the received fault information, single-ended current signal, temperature information and rotor rotation angle information.

[0045] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0046] Through the above connection, when the fault information indicates a fault, or when a corresponding abnormality occurs in at least one of the single-ended current signal, temperature information, and rotor rotation angle information, the first micro-control unit can actively intervene to utilize the A-phase cut-off control module and the B-phase cut-off control module to disconnect the A-phase cut-off module and / or the B-phase cut-off module corresponding to the faulty route.

[0047] The utility model also provides an electromechanical braking system, comprising the above-mentioned dual-winding motor drive circuit.

[0048] The utility model also provides a car, comprising: a car body and an electromechanical braking system as described above, which is applied to the car body. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a control logic diagram of a dual-winding motor drive circuit of the utility model;

[0050] Figure 2 This is a specific circuit diagram of a dual-winding motor drive circuit of the present utility model. DETAILED DESCRIPTION

[0051] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0052] This utility model provides a dual-winding motor drive circuit, please refer to Figure 1 As shown, it includes: a strobe module, an A-channel driving unit, a B-channel driving unit, and a first micro-control unit and a second micro-control unit that are communicatively connected to each other, wherein:

[0053] The signal output terminal of the first micro-control unit is connected to the first input terminal of the gating module, the signal output terminal of the second micro-control unit is connected to the second input terminal of the gating module, the signal control terminal of the first micro-control unit is further connected to the gating signal terminal of the gating module, and the gating module is configured to connect the output terminal of the gating module to the first input terminal of the gating module or the second input terminal of the gating module according to the level information received by the gating signal terminal thereof;

[0054] The output end of the gating module is connected to one of the windings of the motor through the A-path driving unit, and the output end of the gating module is also connected to the other winding of the motor through the B-path driving unit.

[0055] The first micro-control unit and the second micro-control unit communicate with each other to exchange data in real time. During normal operation, the first micro-control unit controls its signal control terminal to output a high level, so that the first input terminal of the strobe module is connected to the output terminal of the strobe module, and the signal output terminal of the first micro-control unit is connected to the A-channel drive unit and the B-channel drive unit through the strobe module, thereby controlling the operation of the two windings of the motor;

[0056] At this time, even if the first micro-control unit fails, the signal output terminal of the first micro-control unit is suspended or outputs a low level, and then the second input terminal of the strobe module is connected to the output terminal of the strobe module, so that the signal output terminal of the second micro-control unit is connected to the A-channel drive unit and the B-channel drive unit to control the operation of the two windings of the motor;

[0057] During the above control process, the two windings of the motor are always in working state, and one of the windings will not stop working due to a failure of the first micro-control unit, which greatly improves the overall performance stability of the motor system.

[0058] Specifically, please refer to Figure 2 As shown, the gating module includes a first multi-way switch and a second multi-way switch, wherein,

[0059] The signal output terminal of the first micro-control unit is connected to the first input terminal of the first multi-way switch and the first input terminal of the second multi-way switch respectively, the signal output terminal of the second micro-control unit is connected to the second input terminal of the first multi-way switch and the second input terminal of the second multi-way switch respectively, and the signal control terminal of the first micro-control unit is connected to the selection signal terminal of the first multi-way switch and the selection signal terminal of the second multi-way switch respectively, wherein,

[0060] The signal output end of the first micro-control unit is pin 2, the signal output end of the second micro-control unit is pin 1, the first input end of the first multiplexer is pin 1, the second input end of the first multiplexer is pin 2, the output end of the first multiplexer is pin Z, the selection signal end of the first multiplexer is pin S, the first input end of the second multiplexer is pin 1, the second input end of the second multiplexer is pin 2, the output end of the first multiplexer is pin Z, and the selection signal end of the second multiplexer is pin S;

[0061] The first multi-way switch is configured to connect the Z pin output terminal of the first multi-way switch to the first input terminal of pin 1 of the first multi-way switch or the second input terminal of pin 2 of the first multi-way switch based on the level information received by the S pin selection signal terminal of the first multi-way switch, and the second multi-way switch is configured to connect the Z pin output terminal of the second multi-way switch to the first input terminal of pin 1 of the second multi-way switch or the second input terminal of pin 2 of the second multi-way switch based on the level information received by the S pin selection signal terminal of the second multi-way switch.

[0062] In the above structure, the first micro-control unit can simultaneously control the A-way drive unit and the B-way drive unit through the first multi-way switch and the second multi-way switch, and the second micro-control unit can also simultaneously control the A-way drive unit and the B-way drive unit through the first multi-way switch and the second multi-way switch.

[0063] Specifically, the A-channel driving unit includes an A-channel pre-driving IC and an A-channel three-phase full-bridge, and the B-channel driving unit includes a B-channel pre-driving IC and a B-channel three-phase full-bridge, wherein:

[0064] The Z pin output end of the first multi-way switch is connected to the 1 pin of the A-way pre-driver IC, the 2 pin and the 3 pin of the A-way pre-driver IC are connected to the input end of the A-way three-phase full-bridge, and the output end of the A-way three-phase full-bridge is connected to one of the windings of the motor;

[0065] The Z pin output end of the second multi-way switch is connected to the 1 pin of the B-way pre-driver IC, the 2 pins and 3 pins of the B-way pre-driver IC are connected to the input end of the B-way three-phase full-bridge, and the output end of the B-way three-phase full-bridge is connected to the other winding of the motor;

[0066] The first micro-control unit and the second micro-control unit can control the A-way pre-driver IC and the B-way pre-driver IC to send PWM modulation signals. After passing through the A-way three-phase full-bridge or the B-way three-phase full-bridge, the signal can control the three phases of the motor winding.

[0067] Specifically, the signal acquisition end of the A-way pre-driver IC is connected to multiple bridge arms of the A-way three-phase full bridge. The signal acquisition end of the A-way pre-driver IC is Figure 2 Pins 4, 5, 6, and 7 of the pre-driver IC of channel A, wherein the pre-driver IC of channel A is configured to determine whether the three-phase full bridge of channel A is faulty based on two differential signals collected between the bridge arms of the three-phase full bridge of channel A;

[0068] The signal acquisition terminal of the B-way pre-driver IC is connected to the bridge arm of the B-way three-phase full bridge. The signal acquisition terminal of the B-way pre-driver IC is Figure 2 Pins 4, 5, 6 and 7 of the B-way pre-driver IC in the circuit, the B-way pre-driver IC is configured to determine whether the B-way three-phase full bridge is faulty based on at least two differential signals collected between the bridge arms of the B-way three-phase full bridge.

[0069] By utilizing the signal acquisition end of the A-channel pre-driver IC and the signal acquisition end of the B-channel pre-driver IC, the status of the A-channel three-phase full-bridge and the B-channel three-phase full-bridge can be clearly determined in real time to determine whether there is a fault.

[0070] Specifically, the circuit further includes: a phase cut-off module for a line A, a phase cut-off control module for a line A, a phase cut-off module for a line B, and a phase cut-off control module for a line B, wherein:

[0071] The A-path three-phase full-bridge sequentially passes through the input end and the output end of the A-path phase-cutoff module until it is connected to one of the windings of the motor. The control end of the A-path phase-cutoff module is connected to the 8-pin control end of the A-path pre-driver IC via the A-path phase-cutoff control module. The A-path phase-cutoff module is configured to control the conduction between the input end and the output end of the A-path phase-cutoff module according to a level signal received by the control end of the A-path phase-cutoff module.

[0072] In this embodiment, the phase-cutoff module of path A is composed of three N-channel MOS transistors. The input end of the phase-cutoff module of path A is the source of the three N-channel MOS transistors, the output end of the phase-cutoff module of path A is the drain of the three N-channel MOS transistors, the control end of the phase-cutoff module of path A is the gate of the three N-channel MOS transistors, the sources of the three N-channel MOS transistors are connected one by one to the three bridge arms of the three-phase full bridge of path A, and the drains of the three N-channel MOS transistors are connected to one of the windings of the motor (specifically, Figure 2 The three phases of the winding A) are connected one by one, and the A-phase cut-off control module is respectively connected to the gates of the three N-channel MOS transistors to control the conduction of the three N-channel MOS transistors according to the electrical signal received by the A-phase cut-off control module.

[0073] The B-path three-phase full-bridge sequentially passes through the input end and the output end of the B-path phase-cutoff module until it is connected to another winding of the motor. The control end of the B-path phase-cutoff module is connected to the 8-pin control end of the B-path pre-driver IC through the B-path phase-cutoff control module. The B-path phase-cutoff module is configured to control the conduction of the input end and the output end of the B-path phase-cutoff module according to the level signal received by the control end of the B-path phase-cutoff module.

[0074] In this embodiment, the B-phase cut-off module is also another three N-channel MOS transistors. The input end of the B-phase cut-off module is the source of the three N-channel MOS transistors, the output end of the B-phase cut-off module is the drain of the three N-channel MOS transistors, and the control end of the B-phase cut-off module is the gate of the three N-channel MOS transistors. The sources of the three N-channel MOS transistors are respectively connected to the three bridge arms of the B-phase three-phase full bridge, and the drains of the three N-channel MOS transistors are respectively connected to the other winding of the motor (specifically Figure 2The three phases of the winding B) are connected one by one, and the B-way phase cut-off control module is respectively connected to the gates of the three N-channel MOS transistors to control the conduction of the three N-channel MOS transistors according to the electrical signal received by the B-way phase cut-off control module.

[0075] When the A-channel pre-driver IC detects a fault in the A-channel three-phase full-bridge, it can control the A-channel phase-cutoff control module and send a corresponding level signal to the control end of the A-channel phase-cutoff module to disconnect the A-channel three-phase full-bridge from one of the motor windings to avoid affecting the normal operation of the other motor winding.

[0076] Similarly, when the B-channel pre-driver IC detects a B-channel three-phase full-bridge fault, it can control the B-channel phase-cutoff control module and send a corresponding level signal to the control end of the B-channel phase-cutoff module to disconnect the B-channel three-phase full-bridge from one of the motor windings, thereby avoiding affecting the normal operation of the other winding of the motor.

[0077] Specifically, the circuit also includes a temperature sensing module and a rotor position detection module, wherein the temperature sensor is 4 NTC resistors. Figure 2 It is represented by two NTC*2, where two NTC resistors are placed in the A-path three-phase full bridge to detect the temperature of the A-path three-phase full bridge, and the other two NTC resistors are placed in the B-path three-phase full bridge to detect the temperature of the B-path three-phase full bridge.

[0078] The temperature sensing module is connected to the first micro-control unit and the second micro-control unit. Specifically, the two NTC resistors located in the three-phase full-bridge of channel A are connected to pin 6 of the first micro-control unit and pin 8 of the second micro-control unit through two different RC filter modules, so as to transmit the temperature of the three-phase full-bridge of channel A to the first micro-control unit and the second micro-control unit;

[0079] The two NTC resistors located in the B-path three-phase full-bridge are connected to the 10th pin of the first micro-control unit and the 4th pin of the second micro-control unit respectively through two different RC filter modules to transmit the temperature of the B-path three-phase full-bridge to the first micro-control unit and the second micro-control unit;

[0080] The rotor position detection module is connected to both the first micro-control unit and the second micro-control unit. The rotor position detection module is used to detect the rotation angles of the two rotors in the motor. Specifically, the rotor position detection module includes an A-path rotor position detection module and a B-path rotor position detection module. The A-path rotor position detection module is used to detect the rotation angle of the rotor of the A winding of the motor and transmit the position information of the rotation angle to pin 7 of the first micro-control unit and pin 9 of the second micro-control unit respectively through two different RC filter modules.

[0081] The B-path rotor position detection module is used to detect the rotation angle of the rotor of the B winding of the motor, and transmit the position information of the rotation angle to pin 11 of the first micro-control unit and pin 5 of the second micro-control unit respectively through two different RC filter modules;

[0082] By detecting the temperature of the A-path three-phase full bridge and the B-path three-phase full bridge, as well as the position detection of the rotation angle of the two winding rotors, the status of whether the circuit is operating normally can be obtained in real time.

[0083] Specifically, pin 9 of the A-channel pre-driver IC is connected to pin 5 of the first micro-control unit and pin 3 of the second micro-control unit through two different RC filter modules. At this time, the A-channel pre-driver IC amplifies the two collected differential signals and transmits the processed single-ended current signal of the A-channel three-phase full-bridge arm to the first micro-control unit and the second micro-control unit at the same time;

[0084] Pin 9 of the B-channel pre-driver IC is simultaneously connected to pin 9 of the first micro-control unit and pin 3 of the second micro-control unit. At this time, the B-channel pre-driver IC amplifies and processes the two collected differential information, and transmits the processed single-ended current signal of the B-channel three-phase full-bridge arm to the first micro-control unit and the second micro-control unit at the same time.

[0085] By sending the single-ended current signals of the bridge arms of the A-path three-phase full bridge and the B-path three-phase full bridge to the first micro-control unit and the second micro-control unit, active monitoring of the operating status of the A-path three-phase full bridge and the B-path three-phase full bridge can be achieved.

[0086] Specifically, the first micro-control unit is connected to the second micro-control unit's pin 10 via its pin 12 to achieve communication between the two and exchange of input data such as current information, temperature information, position information, status information, verification information, and superior instruction information;

[0087] The second micro-control unit is further connected to the pin 13 of the first micro-control unit via the pin 11 thereof to monitor the fault status of the first micro-control unit;

[0088] Specifically, pin 10 of the A-channel pre-driver IC is also connected to pin 3 of the first micro-control unit and pin 6 of the second micro-control unit, so as to simultaneously transmit information on whether the A-channel three-phase full-bridge is faulty to the first micro-control unit and the second micro-control unit;

[0089] Pin 10 of the B-channel pre-driver IC is also connected to pin 8 of the first micro-control unit and pin 2 of the second micro-control unit, so as to simultaneously transmit information on whether the B-channel three-phase full-bridge is faulty to the first micro-control unit and the second micro-control unit;

[0090] The 4-pin of the first micro-control unit is also connected with the A-phase cut-off control module and the B-phase cut-off control module, so as to control the conduction and disconnection of the A-phase cut-off module and / or the B-phase cut-off module according to at least one of the received fault information, single-end current signal, temperature information and rotor rotation angle information.

[0091] Through the above connection, when the fault information shows a fault, or at least one of the single-end current signal, temperature information and rotor rotation angle information appears corresponding abnormality, the first micro-control unit can actively intervene to disconnect the A-phase cut-off module and / or the B-phase cut-off module corresponding to the fault route by using the A-phase cut-off control module and the B-phase cut-off control module.

[0092] In general, the specific working principle of the utility model is as follows:

[0093] The position information of the winding rotation angle of the A-phase rotor position detection module is output to the first micro-control unit and the second micro-control unit after passing through the RC filter module respectively; the differential signal of the two A-phase three-phase full-bridge arm currents collected by the A-phase pre-driver IC is output as a current single-end signal after amplification processing, and is output to the first micro-control unit and the second micro-control unit after passing through the RC filter circuit respectively; two NTC resistors are placed at the middle position of the adjacent two phases of the A-phase three-phase full-bridge, which are used for bridge drive temperature detection, and the temperature signal is output to the first micro-control unit and the second micro-control unit after passing through the RC filter circuit. Similarly, the position information of the winding rotation angle, the current single-end signal and the full-bridge temperature detection of the B-phase are output to the first micro-control unit and the second micro-control unit after being processed respectively.

[0094] The phase cut-off signal of the 8-pin of the A-phase pre-driver IC is connected to the A-phase cut-off module through the A-phase cut-off control module, and the phase cut-off signal of the 8-pin of the B-phase pre-driver IC is connected to the B-phase cut-off module through the B-phase cut-off control module, and meanwhile, the two-way phase cut-off signals of the 4-pin of the first micro-control unit are connected to the A-phase cut-off control module and the B-phase cut-off control module respectively. That is, the A-phase cut-off module and the B-phase cut-off module are controlled by the corresponding pre-driver IC and the first micro-control unit at the same time.

[0095] The first micro-control unit and the second micro-control unit communicate with each other, such as CAN or SPI communication, to realize data exchange. Meanwhile, the second micro-control unit detects the state signal of the first micro-control unit, and directly controls when the first micro-control unit appears a fault and does not inform the second micro-control unit.

[0096] Under normal circumstances, the A-phase cutoff module and the B-phase cutoff module are inactive, and their three N-channel MOS transistors are on by default. The A-phase pre-driver IC and the B-phase pre-driver IC receive control signals from the first and second microcontrollers, respectively, and output PWM drive signals to control the three-phase full-bridge circuit, driving and controlling the motor windings. Combined with current sampling and rotor position detection, they achieve closed-loop control of current, position, and speed. Using space vector control algorithms or other algorithms, they can achieve high-performance drive control.

[0097] When the first micro-control unit is operating normally, the select pins S of the first and second multi-way switches are set to select channel 1. At this time, the drive control signals of the two drive units are respectively derived from the two sets of control signals output by the first micro-control unit, and are not controlled by the second micro-control unit. If the first micro-control unit fails and the signals of the select pins S of the first and second multi-way switches fail, the default selection is to select channel 2. At this time, the drive control signals of the two drive units are respectively derived from the two sets of control signals output by the second micro-control unit, and are not affected by the first micro-control unit. In this way, the first and second micro-control units achieve cross-control of the two sets of drive units.

[0098] The phase-cutoff control module includes active and passive phase-cutoffs. Active phase-cutoff means that the first micro-control unit actively controls a phase-cutoff control module to cut off the phase. When the first micro-control unit detects that a certain fault has occurred in the drive unit, such as a short circuit in the MOS tube of the three-phase full-bridge, it is necessary to operate the phase-cutoff between the three-phase full-bridge and the corresponding winding. Passive phase-cutoff means that when the logic of the A-way pre-driver IC or the B-way pre-driver IC detects a specific fault in the drive unit, it directly controls the phase-cutoff and reports the fault information to the first micro-control unit and the second micro-control unit at the same time. The purpose of active and passive phase-cutoff is to prevent certain faults in the drive unit from affecting the normal operation of the other winding of the motor.

[0099] The utility model adopts the above-mentioned method:

[0100] 1. It can achieve full redundancy in the case of single-point failure. That is, in the event of any single-point failure, the phase cut-off control module A and the phase cut-off control module B will cut off the phase at the corresponding fault point, and the system will not fail and will not affect the function and performance, thus ensuring the highest overall functional safety level.

[0101] 2. It can realize cross-dual control of two independent drive units. Either the first micro-control unit controls the two drive units at the same time, or the second micro-control unit controls the two drive units at the same time. Compared with the existing technology in which two micro-control units control one drive unit respectively, the synchronization of the two winding drives of the motor is much better, which can achieve higher drive efficiency and drive performance.

[0102] 3、Normal working condition, two groups of drive circuit work at the same time, each distribution 50% power, compared to only winding A distribution 100% power, two drive units and motor winding can evenly distribute power, can prolong the overall life.

[0103] When a specific fault occurs in the drive unit, the phase can be cut off to prevent these faults from affecting the normal operation of the other winding of the motor and to avoid a decline in the output performance of the motor.

[0104] The utility model discloses a drive and control based on ordinary single winding motor, through the redundancy of single drive unit into two drive units, the same composition and architecture in each drive unit, all include pre-drive IC, three -phase full bridge, motor winding, rotor position detection, current sampling, three -phase full bridge temperature detection and phase cut -off circuit.And drive and control to it, to improve the function safety level of motor drive circuit whole, for high demand motor drive occasion, such as wire control brake, electronic mechanical brake etc.Can realize when any node in one of drive units fails to provide driving force, another drive unit can work normally and provide driving force, guarantee the safety of vehicle brake.

[0105] The utility model discloses still provide a kind of electronic mechanical brake system, including a kind of double-winding motor drive circuit as above.

[0106] The utility model discloses still provide a kind of automobile, include: automobile ontology and be applied to the electronic mechanical brake system as above on the automobile ontology.

[0107] In addition, without contradicting each other, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples.

[0108] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and those skilled in the art can change, modify, replace and modify the above-mentioned embodiments within the scope of the utility model.

Claims

1. A dual-winding motor drive circuit, characterized in that: include: A strobe module, an A-channel driving unit, a B-channel driving unit, and a first micro-control unit and a second micro-control unit that are communicatively connected to each other, wherein: The signal output terminal of the first micro-control unit is connected to the first input terminal of the gating module, the signal output terminal of the second micro-control unit is connected to the second input terminal of the gating module, the signal control terminal of the first micro-control unit is further connected to the gating signal terminal of the gating module, and the gating module is configured to connect the output terminal of the gating module to the first input terminal of the gating module or the second input terminal of the gating module according to the level information received by the gating signal terminal thereof; The output end of the gating module is connected to one of the windings of the motor through the A-path driving unit, and the output end of the gating module is also connected to the other winding of the motor through the B-path driving unit.

2. A dual-winding motor drive circuit according to claim 1, characterized in that: The gating module includes a first multi-way switch and a second multi-way switch, wherein: The signal output terminal of the first micro-control unit is connected to the first input terminal of the first multi-way switch and the first input terminal of the second multi-way switch respectively, the signal output terminal of the second micro-control unit is connected to the second input terminal of the first multi-way switch and the second input terminal of the second multi-way switch respectively, and the signal control terminal of the first micro-control unit is connected to the selection signal terminal of the first multi-way switch and the selection signal terminal of the second multi-way switch respectively; The first multi-way switch is configured to connect the output end of the first multi-way switch to the first input end of the first multi-way switch or the second input end of the first multi-way switch according to the level information received at its selection signal end, and the second multi-way switch is configured to connect the output end of the second multi-way switch to the first input end of the second multi-way switch or the second input end of the second multi-way switch according to the level information received at its selection signal end.

3. A dual-winding motor drive circuit according to claim 2, characterized in that: The A-channel driving unit includes an A-channel pre-driving IC and an A-channel three-phase full-bridge, and the B-channel driving unit includes a B-channel pre-driving IC and a B-channel three-phase full-bridge, wherein: The output end of the first multi-way switch passes through the A-way pre-driver IC and the A-way three-phase full-bridge in sequence until it is connected to one of the windings of the motor; The output end of the second multi-way switch passes through the B-way pre-driver IC and the B-way three-phase full-bridge in sequence until it is connected to the other winding of the motor.

4. A dual-winding motor drive circuit according to claim 3, characterized in that: The signal acquisition terminal of the A-way pre-driver IC is connected to multiple bridge arms of the A-way three-phase full bridge, and the A-way pre-driver IC is configured to determine whether the A-way three-phase full bridge is faulty based on at least two differential signals collected between the bridge arms of the A-way three-phase full bridge; The signal acquisition end of the B-path pre-driver IC is connected to the bridge arm of the B-path three-phase full bridge. The B-path pre-driver IC is configured to determine whether the B-path three-phase full bridge is faulty based on at least two differential signals collected between the bridge arms of the B-path three-phase full bridge.

5. The dual-winding motor drive circuit according to claim 4, characterized in that: Also includes: A phase cut-off module, A phase cut-off control module, B phase cut-off module and B phase cut-off control module, wherein, The A-path three-phase full-bridge sequentially passes through the input end and the output end of the A-path phase-cutoff module until it is connected to one of the windings of the motor. The control end of the A-path phase-cutoff module is connected to the control end of the A-path pre-driver IC via the A-path phase-cutoff control module. The A-path phase-cutoff module is configured to control the conduction between the input end and the output end of the A-path phase-cutoff module according to a level signal received by the control end of the A-path phase-cutoff module. The B-path three-phase full-bridge sequentially passes through the input end and the output end of the B-path phase-cutoff module until it is connected to the other winding of the motor. The control end of the B-path phase-cutoff module is connected to the control end of the B-path pre-driver IC through the B-path phase-cutoff control module. The B-path phase-cutoff module is configured to control the conduction between the input end and the output end of the B-path phase-cutoff module based on a level signal received by the control end of the B-path phase-cutoff module.

6. A dual-winding motor drive circuit according to claim 5, characterized in that: It also includes a temperature sensing module and a rotor position detection module, wherein: The temperature sensing module is connected to the first micro-control unit and the second micro-control unit at the same time, and the temperature sensing module is used to detect the temperature of the A-path three-phase full-bridge and the B-path three-phase full-bridge; The rotor position detection module is connected to the first micro-control unit and the second micro-control unit at the same time. The rotor position detection module is used to detect the rotation angles of the two rotors in the motor.

7. The dual-winding motor drive circuit according to claim 6, characterized in that: The A-channel pre-driver IC is connected to the first micro-control unit and the second micro-control unit at the same time, so as to transmit the single-ended current signal of the A-channel three-phase full-bridge arm to the first micro-control unit and the second micro-control unit at the same time; The B-channel pre-driver IC is connected to the first micro-control unit and the second micro-control unit at the same time, so as to transmit the single-ended current signal of the B-channel three-phase full-bridge arm to the first micro-control unit and the second micro-control unit at the same time.

8. The dual-winding motor drive circuit according to claim 7, characterized in that: The A-channel pre-driver IC is also connected to the first micro-control unit and the second micro-control unit to simultaneously transmit information on whether the A-channel three-phase full-bridge is faulty to the first micro-control unit and the second micro-control unit; The B-channel pre-driver IC is also connected to the first micro-control unit and the second micro-control unit to simultaneously transmit information on whether the B-channel three-phase full-bridge is faulty to the first micro-control unit and the second micro-control unit; The first micro-control unit is also connected to the A-phase cut-off control module and the B-phase cut-off control module to control the conduction and disconnection of the A-phase cut-off module and / or the B-phase cut-off module based on at least one of the received fault information, single-ended current signal, temperature information and rotor rotation angle information.

9. An electromechanical braking system, characterized in that: The invention comprises a dual-winding motor drive circuit as claimed in any one of claims 1 to 8.

10. An automobile, characterized in that: include: A vehicle body and an electromechanical braking system as claimed in claim 9 applied to the vehicle body.

Images