Output side circuit of driving power supply, driving power supply, motor driving system and new energy vehicle

Abstract

The utility model discloses an output side circuit of a driving power supply, a driving power supply, a motor drive system and a new energy vehicle, and relates to the technical field of a controller driving power supply. The three-phase secondary coils wound on the magnetic core of the transformer in the driving power supply are each connected to an output side circuit, and the output side circuit of the driving power supply includes a current limiting protection module, an anti-reverse high voltage module, a driving module and a power module that are electrically connected in sequence; the current limiting protection module is used to enable its own current limiting function to limit the current of the output side circuit when a short circuit fails in the power module; the anti-reverse high voltage module is used to block the reverse voltage generated by the short circuit failure of the power module when a short circuit fails in the power module. The utility model aims to avoid the influence on the robustness of the motor drive system after the short circuit failure of the power module on the output side of a certain phase of the driving power supply, so as to enhance the robustness of the motor drive system.

Description

Technical Field

[0001] The utility model relates to the technical field of controller drive power supply, in particular to a drive power supply and an output side circuit thereof, a motor drive system, and a new energy vehicle. Background Art

[0002] At present, when a power module (such as an IGBT tube) on a phase output side of a low-voltage drive power supply or a high-voltage drive power supply in a motor drive system fails due to a short circuit, high voltage may be introduced into the drive side, thereby causing the corresponding drive power supply to short-circuit, and then causing the motor drive system to be unable to enter the ASC (Active Short Circuit) state of the short-circuited bridge arm due to the short circuit of one of the low-voltage drive power supply and the high-voltage drive power supply. If the motor drive system is in a high-speed working condition at this time, it can only enter the FW (Free Wheeling) state, which will affect the robustness of the motor drive system. Utility Model Content

[0003] The main purpose of the utility model is to provide an output side circuit of a driving power supply, aiming to avoid the influence on the robustness of the motor drive system after the power module on the output side of a phase of the driving power supply fails due to short circuit, so as to enhance the robustness of the motor drive system.

[0004] To achieve the above object, the utility model provides an output side circuit of a driving power supply, wherein the three-phase secondary coils wound on the magnetic core of the transformer in the driving power supply are each connected to one of the output side circuits, and the output side circuit of the driving power supply comprises a current limiting protection module, a reverse high voltage prevention module, a driving module and a power module which are electrically connected in sequence;

[0005] The current limiting protection module is used to enable its own current limiting function to limit the current of the output side circuit when the power module fails due to a short circuit;

[0006] The reverse high voltage prevention module is used to block the reverse voltage generated by the short circuit failure of the power module when the power module fails due to a short circuit.

[0007] In one embodiment, the output side circuit of the driving power supply further includes a filtering module, a first capacitor and a voltage stabilizing diode;

[0008] The filtering module is connected in parallel with the current limiting protection module, the first end of the first capacitor is connected to the anti-reverse high voltage module and the driving module respectively, the second end of the first capacitor is connected to the cathode of the voltage stabilizing diode and the driving module respectively, and the anode of the voltage stabilizing diode is connected to the current limiting protection module and the driving module respectively;

[0009] Alternatively, the first end of the first capacitor is respectively connected to the first end of the filter module and the current limiting protection module, the second end of the first capacitor is respectively connected to the cathode of the voltage regulator diode and the driving module, and the anode of the voltage regulator diode is respectively connected to the second end of the filter module and the driving module.

[0010] In one embodiment, the filtering module includes a first resistor and a second capacitor;

[0011] The first resistor is connected in parallel with the second capacitor and the current limiting protection module;

[0012] Alternatively, the first resistor is connected in parallel with the second capacitor, a first end of the first resistor is connected to a first end of the first capacitor, and a second end of the first resistor is connected to an anode of the Zener diode.

[0013] In one embodiment, the output side circuit of the driving power supply further includes a voltage stabilizing module connected to the filtering module.

[0014] In one embodiment, the current limiting protection module includes a low voltage dropout linear regulator, a buck converter or a current limiting circuit.

[0015] In one embodiment, the reverse high voltage protection module includes a reverse high voltage protection diode, an anode of the reverse high voltage protection diode is connected to the current limiting protection module, and a cathode of the reverse high voltage protection diode is connected to the driving module.

[0016] In one embodiment, the driving module includes a driving chip, a second resistor, a first diode and a second diode;

[0017] The first end of the driving chip is respectively connected to the cathode of the first diode and the anti-reverse high voltage module, the second end of the driving chip is connected to the first end of the second resistor, the third end of the driving chip is respectively connected to the anode of the second diode and the current limiting protection module, and the second end of the second resistor, the anode of the first diode and the cathode of the second diode are connected to the power module;

[0018] Alternatively, the first end of the driving chip is respectively connected to the cathode of the first diode and the anti-reverse high-voltage module, the second end of the driving chip is connected to the first end of the second resistor, the third end of the driving chip is connected to the anode of the second diode, and the second end of the second resistor, the anode of the first diode and the cathode of the second diode are connected to the power module.

[0019] In addition, to achieve the above-mentioned purpose, the utility model also provides a driving power supply, which includes a transformer, a three-phase secondary coil wound on the magnetic core of the transformer and the output side circuit of the above-mentioned driving power supply, and each phase secondary coil is respectively connected to one of the output side circuits.

[0020] In addition, to achieve the above-mentioned purpose, the utility model also provides a motor drive system, which includes the output side circuit of the above-mentioned drive power supply.

[0021] In addition, to achieve the above-mentioned purpose, the utility model also provides a new energy vehicle, which includes the output side circuit of the above-mentioned driving power supply.

[0022] The utility model provides an output side circuit of a driving power supply, in which three-phase secondary coils wound on the magnetic core of a transformer in the driving power supply are each connected to an output side circuit, and the output side circuit of the driving power supply comprises a current limiting protection module, an anti-reverse high-voltage module, a driving module and a power module which are electrically connected in sequence; the current limiting protection module is used to enable its own current limiting function to limit the current of the output side circuit when a short circuit failure occurs in the power module; and the anti-reverse high-voltage module is used to block the reverse voltage generated by the short circuit failure of the power module when a short circuit failure occurs in the power module.

[0023] The utility model blocks the reverse voltage generated by the short-circuit failure of the power module by arranging an anti-reverse high-voltage module in the output side circuit of the driving power supply, so as to avoid the influence of the high voltage introduced into the driving side of the driving power supply on the robustness of the motor driving system, and also limits the current of the output side circuit when the power module fails in a short circuit by arranging a current limiting protection module, so as to avoid the power module continuing to be in a short-circuit failure state. Therefore, the utility model arranges the current limiting protection module and the anti-reverse high-voltage module in the output side circuit of the driving power supply, so that the driving power supply will not cause the corresponding motor driving system to be unable to enter the ASC state due to the short-circuit failure of the power module on the output side of a certain phase. Therefore, the output side circuit of the driving power supply provided by the utility model can avoid the influence of the robustness of the motor driving system after the short-circuit failure of the power module on the output side of a certain phase of the driving power supply, thereby enhancing the robustness of the motor driving system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of the first embodiment of the output side circuit of the driving power supply of the utility model;

[0026] Figure 2 It is a structural schematic diagram of a case where a driving module in an output side circuit of a driving power supply of the utility model includes a driving chip, a second resistor, a first diode, and a second diode;

[0027] Figure 3 It is another structural schematic diagram when the driving module in the output side circuit of the driving power supply of the utility model includes a driving chip, a second resistor, a first diode, and a second diode;

[0028] Figure 4 A structural diagram of a second embodiment of the output side circuit of the driving power supply of the utility model;

[0029] Figure 5 It is another structural schematic diagram of the second embodiment of the output side circuit of the driving power supply of the utility model;

[0030] Figure 6 It is a structural schematic diagram of a case where the filter module in the output side circuit of the driving power supply of the utility model includes a first resistor and a second capacitor;

[0031] Figure 7 It is another structural schematic diagram when the filter module in the output side circuit of the driving power supply of the utility model includes a first resistor and a second capacitor;

[0032] Figure 8 A schematic diagram of a circuit structure of an output side circuit of a driving power supply after combining various embodiments of the utility model;

[0033] Fig. 9 It is another circuit structure schematic diagram of the output side circuit of the driving power supply after the various embodiments of the utility model are combined.

[0034] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0035] Description of Figure Numbers:

[0036] 10. Current limiting protection module; 20. Anti-reverse high voltage module; 30. Drive module; 40. Power module; 50. Filter module; 60. Voltage stabilizing module; U1. Drive chip; A1. Voltage stabilizing diode; D1~D3. Diodes; Dx. High-voltage diode; R1~R2. Resistors; B1. Low voltage difference linear regulator; Q1. IGBT tube. DETAILED DESCRIPTION

[0037] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It should be noted that the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0040] In the motor controller (also known as the motor drive system) of new energy vehicles, the driving power supply mainly provides driving voltage for the 6-way power modules (such as IGBT tubes) and provides backup power for functional safety.

[0041] At present, when a power module on a certain phase output side of a low-voltage drive power supply or a high-voltage drive power supply in a motor drive system fails due to a short circuit, high voltage may be introduced into the drive side, thereby causing the corresponding drive power supply to short-circuit, and then the motor drive system will be unable to enter the ASC state of the short-circuited bridge arm due to the short circuit of one of the low-voltage drive power supply and the high-voltage drive power supply. If the motor drive system is in a high-speed working condition at this time, it can only enter the FW state, which will cause the vehicle to be in an incomplete state due to the occurrence of unexpected torque, which will affect the robustness of the motor drive system.

[0042] Based on this, the utility model provides an output side circuit of a driving power supply. In the first embodiment of the utility model, please refer to Figure 1 The three-phase secondary coils wound on the magnetic core of the transformer in the driving power supply are each connected to an output side circuit. The output side circuit of the driving power supply includes a current limiting protection module 10, a reverse high voltage prevention module 20, a driving module 30 and a power module 40 which are electrically connected in sequence; the current limiting protection module 10 is used to enable its own current limiting function to limit the current of the output side circuit when the power module 40 fails due to a short circuit; the reverse high voltage prevention module 20 is used to block the reverse voltage generated by the short circuit failure of the power module 40 when the power module 40 fails due to a short circuit.

[0043] It should be noted that the current limiting protection module 10 may include a low dropout linear regulator (LDO), a buck converter (BUCK), a current limiting circuit or other devices with overcurrent and overtemperature protection functions. The present embodiment does not specifically limit the composition of the current limiting protection module 10. The anti-reverse high-voltage module 20 may include a high-voltage diode, a MOS tube, an IGBT tube (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), etc. The present embodiment does not specifically limit the composition of the anti-reverse high-voltage module 20. In actual use, in order to reduce the cost of the output side circuit of the driving power supply, a low dropout linear regulator is usually selected as the current limiting protection module 10, and a high-voltage diode is selected as the anti-reverse high-voltage module 20. In addition, the selection of a high-voltage diode as the anti-reverse high-voltage module 20 can also effectively improve the accuracy of the output voltage of the output side circuit of the driving power supply.

[0044] In a feasible implementation, the driving module 30 may include a driving chip U1, a second resistor R2, a first diode D1 and a second diode D2;

[0045] As an example, see Figure 2 The first end of the driving chip U1 is respectively connected to the cathode of the first diode D1 and the anti-reverse high voltage module 20, the second end of the driving chip U1 is connected to the first end of the second resistor R2, the third end of the driving chip U1 is respectively connected to the anode of the second diode D2 and the current limiting protection module 10, the second end of the second resistor R2, the anode of the first diode D1 and the cathode of the second diode D2 are connected to the power module 40.

[0046] As another example, see Figure 3 The first end of the driving chip U1 is respectively connected to the cathode of the first diode D1 and the anti-reverse high voltage module 20, the second end of the driving chip U1 is connected to the first end of the second resistor R2, the third end of the driving chip U1 is connected to the anode of the second diode D2, the second end of the second resistor R2, the anode of the first diode D1 and the cathode of the second diode D2 are connected to the power module 40.

[0047] In this embodiment, a reverse voltage generated by a short-circuit failure of the power module 40 is blocked by setting an anti-reverse high-voltage module 20 in the output side circuit of the driving power supply, so as to avoid the influence of high voltage on the robustness of the motor drive system caused by the introduction of high voltage into the driving side of the driving power supply 40, and a current limiting protection module 10 is set to limit the current of the output side circuit when the power module 40 fails in a short circuit, so as to avoid the power module 40 continuing to be in a short-circuit failure state. Therefore, in this embodiment, a current limiting protection module 10 and an anti-reverse high-voltage module 20 are set in the output side circuit of the driving power supply, so that the driving power supply will not cause the corresponding motor drive system to be unable to enter the ASC state due to the short-circuit failure of the power module 40 on the output side of a certain phase. Therefore, the output side circuit of the driving power supply provided by the driving power supply in this embodiment can avoid the influence of the robustness of the motor drive system after the short-circuit failure of the power module 40 on the output side of a certain phase of the driving power supply, thereby enhancing the robustness of the motor drive system.

[0048] In addition, this embodiment blocks the reverse voltage generated by the short circuit failure of the power module 40 through the anti-reverse high-voltage module 20, and can also avoid the influence of the reverse voltage generated after the short circuit failure of the power module 40 on the current limiting protection module 10, so as to ensure the normal operation of the current limiting protection module 10.

[0049] Based on the above first embodiment, a second embodiment of the output side circuit of the driving power supply of the utility model is proposed. In the second embodiment of the utility model, the output side circuit of the driving power supply may further include a filter module 50, a first capacitor C1 and a voltage regulator diode A1;

[0050] In one possible implementation, please refer to Figure 4 The filtering module 50 is connected in parallel with the current limiting protection module 10, the first end of the first capacitor C1 is respectively connected to the anti-reverse high voltage module 20 and the driving module 30, the second end of the first capacitor C1 is respectively connected to the cathode of the Zener diode A1 and the driving module 30, and the anode of the Zener diode A1 is respectively connected to the current limiting protection module 10 and the driving module 30.

[0051] In another possible implementation, please refer to Figure 5 The first end of the first capacitor C1 is respectively connected to the first end of the filter module 50 and the current limiting protection module 10, the second end of the first capacitor C1 is respectively connected to the cathode of the Zener diode A1 and the driving module 30, and the anode of the Zener diode A1 is respectively connected to the second end of the filter module 50 and the driving module 30.

[0052] In a feasible implementation, the filter module 50 may include a first resistor R1 and a second capacitor C2;

[0053] As an example, follow Figure 6The first resistor R1 is connected in parallel with the second capacitor C2 and the current limiting protection module 10.

[0054] As another example, see Figure 7 The first resistor R1 is connected in parallel with the second capacitor C2, the first end of the first resistor R1 is connected to the first end of the first capacitor C1, and the second end of the first resistor R1 is connected to the anode of the Zener diode A1.

[0055] In this embodiment, a filter module 50 is provided in the output side circuit of the driving power supply to filter out interference signals in the circuit, thereby improving the reliability of the output side circuit of the driving power supply and enhancing the anti-interference capability of the circuit.

[0056] Based on the above second embodiment, a third embodiment of the output side circuit of the driving power supply of the utility model is proposed. In the third embodiment of the utility model, the output side circuit of the driving power supply further includes a voltage stabilizing module 60 connected to the filtering module 50 .

[0057] It should be noted that the voltage stabilizing module 60 may include a diode, a voltage stabilizing circuit or other devices capable of stabilizing voltage. This embodiment does not specifically limit the composition of the voltage stabilizing module 60.

[0058] The current limiting protection module 10, the reverse high voltage protection module 20, the driving module 30, the power module 40, the filtering module 50 and the voltage stabilizing module 60 mentioned in the above embodiments can be flexibly configured according to actual conditions.

[0059] Exemplarily, the current limiting protection module 10 may include a low voltage difference linear regulator B1, the anti-reverse high voltage module 20 may include a high voltage diode Dx, the driving module 30 may include a driving chip U1, a second resistor R2, a first diode D1 and a second diode D2, the power module 40 may include an IGBT tube Q1, the filter module 50 may include a first resistor R1 and a second capacitor C2, and the voltage stabilizing module 60 may include a third diode D3. Different connection methods may respectively obtain the following: Figure 8 and Fig. 9 The circuit structure diagram of the output side circuit of the driving power supply shown.

[0060] The above examples are only used to assist in understanding the present invention and do not constitute a limitation on the output side circuit of the driving power supply of the present invention. More simple transformations based on this technical concept are all within the protection scope of the present invention.

[0061] The utility model also provides a driving power supply, which includes a transformer, a three-phase secondary coil wound on the magnetic core of the transformer, and an output side circuit of the driving power supply, wherein each phase of the secondary coil is connected to an output side circuit, and the structure of the output side circuit of the driving power supply can refer to the above embodiment, which will not be described in detail here. As it should be, since the driving power supply of this embodiment includes all technical solutions of all embodiments of the output side circuit of the above driving power supply, and the technical effects achieved are also exactly the same, they will not be described in detail here.

[0062] The utility model also provides a motor drive system, which includes an output side circuit of a driving power supply. The structure of the output side circuit of the driving power supply can refer to the above embodiment, and will not be described in detail here. As it should be, since the motor drive system of this embodiment includes all technical solutions of all embodiments of the output side circuit of the driving power supply, and the technical effects achieved are also exactly the same, they will not be described in detail here.

[0063] The utility model also provides a new energy vehicle, which includes an output side circuit of a driving power supply. The structure of the output side circuit of the driving power supply can refer to the above embodiment and will not be described in detail here. As it should be, since the new energy vehicle of this embodiment includes all technical solutions of all embodiments of the output side circuit of the driving power supply, and the technical effects achieved are also exactly the same, they will not be described in detail here.

[0064] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An output side circuit of a driving power supply, characterized in that: The three-phase secondary coils wound on the magnetic core of the transformer in the driving power supply are each connected to one of the output side circuits, and the output side circuit of the driving power supply includes a current limiting protection module, a reverse high voltage protection module, a driving module and a power module which are electrically connected in sequence; The current limiting protection module is used to enable its own current limiting function to limit the current of the output side circuit when the power module fails due to a short circuit; The reverse high voltage prevention module is used to block the reverse voltage generated by the short circuit failure of the power module when the power module fails due to a short circuit.

2. The output side circuit of the driving power supply according to claim 1, characterized in that: The output side circuit of the driving power supply further includes a filter module, a first capacitor and a voltage stabilizing diode; The filtering module is connected in parallel with the current limiting protection module, the first end of the first capacitor is respectively connected to the anti-reverse high voltage module and the driving module, the second end of the first capacitor is respectively connected to the cathode of the voltage zener diode and the driving module, and the anode of the voltage zener diode is respectively connected to the current limiting protection module and the driving module; Alternatively, the first end of the first capacitor is respectively connected to the first end of the filter module and the current limiting protection module, the second end of the first capacitor is respectively connected to the cathode of the voltage regulator diode and the driving module, and the anode of the voltage regulator diode is respectively connected to the second end of the filter module and the driving module.

3. The output side circuit of the driving power supply according to claim 2, characterized in that: The filtering module includes a first resistor and a second capacitor; The first resistor is connected in parallel with the second capacitor and the current limiting protection module; Alternatively, the first resistor is connected in parallel with the second capacitor, a first end of the first resistor is connected to a first end of the first capacitor, and a second end of the first resistor is connected to an anode of the Zener diode.

4. The output side circuit of the driving power supply according to claim 2, characterized in that: The output side circuit of the driving power supply further includes a voltage stabilizing module connected to the filtering module.

5. The output side circuit of the driving power supply according to any one of claims 1 to 4, characterized in that: The current limiting protection module includes a low voltage drop linear regulator, a buck converter or a current limiting circuit.

6. The output side circuit of the driving power supply according to any one of claims 1 to 4, characterized in that: The anti-reverse high-voltage module includes an anti-reverse high-voltage diode, an anode of the anti-reverse high-voltage diode is connected to the current limiting protection module, and a cathode of the anti-reverse high-voltage diode is connected to the driving module.

7. The output side circuit of the driving power supply according to any one of claims 1 to 4, characterized in that: The driving module includes a driving chip, a second resistor, a first diode and a second diode; The first end of the driving chip is respectively connected to the cathode of the first diode and the anti-reverse high voltage module, the second end of the driving chip is connected to the first end of the second resistor, the third end of the driving chip is respectively connected to the anode of the second diode and the current limiting protection module, and the second end of the second resistor, the anode of the first diode and the cathode of the second diode are connected to the power module; Alternatively, the first end of the driving chip is respectively connected to the cathode of the first diode and the anti-reverse high-voltage module, the second end of the driving chip is connected to the first end of the second resistor, the third end of the driving chip is connected to the anode of the second diode, and the second end of the second resistor, the anode of the first diode and the cathode of the second diode are connected to the power module.

8. A driving power supply, characterized in that: The driving power supply comprises a transformer, a three-phase secondary coil wound on the magnetic core of the transformer and an output side circuit of the driving power supply as claimed in any one of claims 1 to 7, and each phase secondary coil is respectively connected to one of the output side circuits.

9. A motor drive system, characterized in that: The motor drive system comprises the output side circuit of the drive power supply according to any one of claims 1 to 7.

10. A new energy vehicle, characterized in that: The new energy vehicle comprises an output side circuit of a driving power supply as claimed in any one of claims 1 to 7.

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