Power supply connecting circuit of permanent magnet synchronous motor driving system, motor and automobile

Abstract

The utility model provides a power supply connecting circuit of a permanent magnet synchronous motor driving system, a motor and an automobile, which relate to the technical field of electric steering systems and comprise a power supply input end, a power receiving system, a first filtering module and a second filtering module, one end of the power input end is connected with one end of the power receiving system and one end of the first filtering module, and the other end of the power receiving system is connected with the other end of the power input end. The other end of the first filtering module is connected with one end of the second filtering module, and the other end of the second filtering module is connected with the other end of the power input end. According to the utility model, the problem in the prior art that the driving system is damaged when the positive electrode and the negative electrode of the power supply are short-circuited due to breakdown of the bridged filtering module is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric steering systems, in particular to a power connection circuit, a motor and a car of a permanent magnet synchronous motor drive system. Background Art

[0002] With the rapid development of electrification in the automotive industry, steering control is developing towards wire control, and the requirements for the steering controller (EPSECU) are getting higher and higher. The working principle of EPS is to obtain the torque and angle information of the steering wheel, drive the permanent magnet synchronous motor to output torque to drive the mechanical power steering.

[0003] The performance of this product is closely related to the operating safety of the car. Therefore, the national safety requirements have relatively high requirements for the EMC capability of this product. Therefore, a filter module will be set between the power output end of the above-mentioned permanent magnet synchronous motor and the power receiving system. However, under certain high-voltage conditions, the cross-connected filter module will be broken down, causing the positive and negative poles of the power supply to short-circuit, thereby causing damage to the drive system. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides a power connection circuit, a motor and a vehicle for a permanent magnet synchronous motor drive system, which solves the problem in the prior art that when the cross-connected filter module is broken down, causing the positive and negative poles of the power supply to be short-circuited, the drive system will be damaged.

[0005] At least one embodiment of the utility model provides a power connection circuit of a permanent magnet synchronous motor drive system, comprising: a power input terminal, a power receiving system, and a first filtering module and a second filtering module, wherein:

[0006] One end of the power input terminal is connected to one end of the power receiving system and one end of the first filter module respectively, and the other end of the power receiving system is connected to the other end of the power input port;

[0007] The other end of the first filter module is connected to one end of the second filter module, and the other end of the second filter module is connected to the other end of the power input end.

[0008] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0009] By using two filter modules, when one of the filter modules is damaged or broken down by external impact, the other filter module will immediately intervene to avoid the short circuit of the positive and negative poles of the power supply, thereby improving the reliability, external impact resistance and voltage resistance performance of the circuit.

[0010] In a power connection circuit of a permanent magnet synchronous motor drive system provided by one embodiment of the utility model, the first filter module is a first filter capacitor, and the second filter module is a second filter capacitor.

[0011] In a power connection circuit of a permanent magnet synchronous motor drive system provided in one embodiment of the utility model, two ends of the power input end are connected to a first electrostatic absorption module.

[0012] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0013] The first static electricity absorption module can be used to absorb the static electricity generated by the system, so as to prevent the static electricity from entering the internal power receiving system and damaging the electronic components of the product, thereby causing the product to fail, the car to lose power and cause car safety problems.

[0014] In a power connection circuit of a permanent magnet synchronous motor drive system provided in one embodiment of the utility model, the first electrostatic absorption module is a TVS diode and a common terminal, wherein:

[0015] One end of the TVS diode is connected to one end of the power input end, and the other end of the TVS diode is connected to the other end of the power input end and the common end respectively.

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

[0017] The TVS diode can be used to absorb electrostatic energy and thus protect components inside the power receiving system.

[0018] In a power connection circuit of a permanent magnet synchronous motor drive system provided in one embodiment of the utility model, a second electrostatic absorption module is also included:

[0019] The common terminal is grounded through the second electrostatic absorption module.

[0020] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0021] By adding a second electrostatic absorption module, static electricity that enters the power receiving system without passing through the TVS diode can be absorbed, making the product more anti-static.

[0022] In a power connection circuit of a permanent magnet synchronous motor drive system provided in one embodiment of the utility model, the second electrostatic absorption module is a jumper resistor.

[0023] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0024] Jumper resistors can be used to absorb static electricity and are cheaper to manufacture.

[0025] In a power connection circuit of a permanent magnet synchronous motor drive system provided by one embodiment of the utility model, the resistance value of the jumper resistor is 1 MΩ.

[0026] The utility model also provides a permanent magnet synchronous motor, comprising a power supply connection circuit of the permanent magnet synchronous motor drive system as described above.

[0027] In a permanent magnet synchronous motor provided by one embodiment of the utility model, one end of the jumper resistor is connected to the common end, and the other end of the jumper resistor is connected to the motor housing.

[0028] The utility model also provides a car, comprising the power supply connection circuit of the permanent magnet synchronous motor drive system as mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of circuit connection relationship of one embodiment of a power connection circuit of a permanent magnet synchronous motor drive system according to the utility model;

[0030] Figure 2 This is a schematic diagram of circuit connection relations of another embodiment of a power connection circuit of a permanent magnet synchronous motor drive system according to the utility model;

[0031] Figure 3 The utility model is a schematic diagram of the principle of the second static electricity absorption module absorbing static electricity inside the power receiving system.

[0032] Description of the drawings: J1 represents the power input terminal, J2 represents the power receiving system, C1 represents the first filter module, C2 represents the second filter module, TVS represents the TVS diode, R1 represents the jumper resistor, GND1 represents the common terminal, and GND2 represents the casing. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] Furthermore, those skilled in the art may combine and associate different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0035] A power connection circuit for a permanent magnet synchronous motor drive system, please refer to Figure 1 As shown, it includes: a power input terminal J1, a power receiving system J2, and a first filter module C1 and a second filter module C2;

[0036] One end of the power input terminal J1 is connected to one end of the power receiving system J2 and one end of the first filter module C1 respectively, and the other end of the power receiving system J2 is connected to the other end of the power input terminal J1;

[0037] The other end of the first filter module C1 is connected to one end of the second filter module C2, and the other end of the second filter module C2 is connected to the other end of the power input terminal J1.

[0038] By using two filter modules, when one of the filter modules is damaged or broken down by external impact, the other filter module will immediately intervene to avoid the short circuit of the positive and negative poles of the power supply, thereby improving the reliability, external impact resistance and voltage resistance performance of the circuit.

[0039] Specifically, the first filter module C1 is a first filter capacitor, and the second filter module C2 is a second filter capacitor.

[0040] When the first filter capacitor can be turned on under certain abnormal circumstances, the second filter capacitor can still act as an isolation circuit to prevent the positive and negative poles of the power supply from being short-circuited; and if the first filter capacitor and the second filter capacitor are both 50V capacitors, then the circuit can theoretically withstand a voltage of 100V, while the traditional single capacitor method can only withstand a maximum voltage of 50V. The reliability of the new series circuit will be much greater than the traditional single capacitor method.

[0041] Considering the rapid development of electrification in the automotive industry, steering control is developing towards wire control, and the requirements for the steering controller (EPS ECU) are getting higher and higher. The working principle of EPS is to obtain the torque and angle information of the steering wheel, drive the permanent magnet synchronous motor to output torque to drive the mechanical power steering.

[0042] The performance of this product is closely related to the operational safety of the car. Therefore, the national safety requirements have a relatively high requirement for the anti-static ability of this product.

[0043] Normally, the maximum electrostatic test voltage required for electrostatic testing is ±15KV;

[0044] The protection method adopted by this circuit is to add a first electrostatic absorption module to the external port position of the product (i.e., the power input terminal) for protection;

[0045] Specifically, please refer to Figure 2 As shown, in Figure 2 In the figure, TVS indicates TVS diode, R1 indicates jumper resistor, GND1 indicates common terminal, and GND2 indicates that the chassis is connected to the ground.

[0046] Both ends of the power input terminal J1 are connected to a first electrostatic absorption module.

[0047] The first static electricity absorption module can be used to absorb the static electricity generated by the system, so as to prevent the static electricity from entering the internal power receiving system J2 and damaging the electronic components of the product, thereby causing the product to fail, the car to lose power and cause car safety problems.

[0048] Specifically, the first electrostatic absorption module is a TVS diode and a common terminal GND1, wherein:

[0049] One end of the TVS diode is connected to one end of the power input terminal J1 , and the other end of the TVS diode is connected to the other end of the power input terminal J1 and the common terminal GND1 , respectively.

[0050] The TVS diode can be used to absorb electrostatic energy, thereby protecting components inside the power receiving system J2.

[0051] If the 15KV electrostatic interference generated externally does not enter the power receiving system through the TVS diode, and there is no release path for the electrostatic energy inside the power receiving system, it is very likely to damage the electronic components inside the power receiving system, causing the product to fail, the car to lose power and cause car safety problems.

[0052] Specifically, in order to solve the above problem, the circuit further includes a second electrostatic absorption module:

[0053] The common terminal GND1 is grounded through the second electrostatic absorption module.

[0054] By adding a second electrostatic absorption module, static electricity that enters the power receiving system J2 without passing through the TVS diode can be absorbed, making the product more anti-static.

[0055] Specifically, the second electrostatic absorption module is a jumper resistor R1.

[0056] The jumper resistor R1 can be used to absorb static electricity and has a lower manufacturing cost.

[0057] Specifically, the resistance of the jumper resistor R1 is 1 MΩ.

[0058] The utility model also provides a permanent magnet synchronous motor, comprising a power supply connection circuit of the permanent magnet synchronous motor drive system as described above.

[0059] In a permanent magnet synchronous motor provided by one embodiment of the present invention, one end of the jumper resistor R1 is connected to the common terminal GND1, and the other end of the jumper resistor R1 is connected to the motor housing GND2.

[0060] It should be understood that the common terminal GND1 is the common ground terminal on the PCB board;

[0061] At this time, you can refer to Figure 3As shown, a 1MΩ electrical jumper resistor R1 is connected in series between the internal common terminal GND1 and the chassis GND2, i.e., the external earth, to form a high-impedance power supply circuit. When high-voltage static electricity is transmitted into the power receiving system, it will immediately return to the external earth through the resistance circuit, and its energy will be lost in this 1MΩ resistor, thereby protecting the internal components from being damaged by static electricity, and ensuring that its static electricity energy will not be transmitted to the outside to affect other parts of the vehicle.

[0062] The utility model also provides a car, comprising the power supply connection circuit of the permanent magnet synchronous motor drive system as mentioned above.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A power connection circuit of a permanent magnet synchronous motor drive system, characterized in that: include: A power input terminal (J1), a power receiving system (J2), a first filter module (C1) and a second filter module (C2), wherein: One end of the power input terminal (J1) is respectively connected to one end of the power receiving system (J2) and one end of the first filter module (C1), and the other end of the power receiving system (J2) is connected to the other end of the power input terminal (J1); The other end of the first filter module (C1) is connected to one end of the second filter module (C2), and the other end of the second filter module (C2) is connected to the other end of the power input terminal (J1).

2. The power connection circuit of a permanent magnet synchronous motor drive system according to claim 1, characterized in that: The first filter module (C1) is a first filter capacitor, and the second filter module (C2) is a second filter capacitor.

3. The power connection circuit of a permanent magnet synchronous motor drive system according to claim 1, characterized in that: Both ends of the power input terminal (J1) are connected to a first electrostatic absorption module.

4. The power connection circuit of a permanent magnet synchronous motor drive system according to claim 3, characterized in that: The first electrostatic absorption module is a TVS diode (TVS) and a common terminal (GND1), wherein: One end of the TVS diode (TVS) is connected to one end of the power input terminal (J1), and the other end of the TVS diode (TVS) is respectively connected to the other end of the power input terminal (J1) and the common terminal (GND1).

5. The power connection circuit of a permanent magnet synchronous motor drive system according to claim 4, characterized in that: Also includes a second electrostatic absorption module: The common terminal (GND1) is grounded through the second electrostatic absorption module.

6. The power connection circuit of a permanent magnet synchronous motor drive system according to claim 5, characterized in that: The second electrostatic absorption module is a jumper resistor (R1).

7. The power connection circuit of a permanent magnet synchronous motor drive system according to claim 6, characterized in that: The resistance of the jumper resistor (R1) is 1 MΩ.

8. A permanent magnet synchronous motor, characterized in that: It comprises a power connection circuit of a permanent magnet synchronous motor drive system as described in claim 7.

9. A permanent magnet synchronous motor according to claim 8, characterized in that: One end of the jumper resistor (R1) is connected to the common end (GND1), and the other end of the jumper resistor (R1) is connected to the motor housing (GND2).

10. An automobile, characterized in that: It comprises a power connection circuit of a permanent magnet synchronous motor drive system as claimed in any one of claims 1 to 7.

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