CN115882707A

CN115882707A - Straight-through discharge control circuit, vehicle driving module and automobile

Info

Publication number: CN115882707A
Application number: CN202211512999.9A
Authority: CN
Inventors: 李环平; 郑威; 张鹏真
Original assignee: Suzhou Huichuan United Power System Co Ltd
Current assignee: Suzhou Huichuan United Power System Co Ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2023-03-31
Also published as: CN115912879A; CN115296518B; CN115296518A

Abstract

The invention discloses a direct discharge control circuit, a vehicle driving module and an automobile, and relates to the technical field of vehicle driving. The vehicle driving module comprises a bus capacitor and a three-phase inversion module which are sequentially and electrically connected, the direct discharge control circuit comprises a first driving module, a second driving module, a low-voltage power supply module, a high-voltage power supply module and a voltage adjusting module, the output end of the first driving module is electrically connected with a three-phase upper bridge arm switching circuit of the three-phase inversion module, the output end of the second driving module is electrically connected with a three-phase lower bridge arm switching circuit of the three-phase inversion module, one of the driving power supply input end of the first driving module and the driving power supply input end of the second driving module is connected with the output end of the low-voltage power supply module, the other one of the driving power supply input end of the first driving module and the driving power supply input end of the second driving module is electrically connected with the high-voltage power supply module, the input end of the voltage adjusting module is connected with the output end of the high-voltage power supply module, and the output end of the voltage adjusting module is connected with the output end of the low-voltage power supply module. The invention improves the working reliability of the vehicle driving module.

Description

Straight-through discharge control circuit, vehicle driving module and automobile

The application is a divisional application of 202211170213.X, and the application date of the parent application, namely 26/09/2022, application number 202211170213.X and the invention creation name are a through discharge control circuit, a vehicle drive module and an automobile.

Technical Field

The invention relates to the technical field of vehicle driving, in particular to a through discharge control circuit, a vehicle driving module and an automobile.

Background

A vehicle driving module of a new energy vehicle generally includes a driving motor and a driving motor controller, and as shown in fig. 1, the vehicle driving module realizes electric and braking control of the motor by turning on and off 6 power transistors (T1 to T6) according to a certain rule. The driving motor controller also comprises a bus capacitor, and when the vehicle driving module is connected to a vehicle, the bus capacitor is electrically connected with the battery pack and has the functions of storing energy and smoothing the voltage of the bus. In the whole vehicle power-off process, the bus capacitor stores larger energy to cause higher voltage. In order to prevent people from being injured, the voltage of the bus capacitor needs to be reduced to below 60V, and the common discharge modes are passive discharge and active discharge. The active discharge has the advantage of high discharge speed, and the common active discharge methods include motor winding discharge, parallel disconnectable discharge resistance, direct-current transformer winding discharge and bridge arm direct discharge.

In the working process of an actual vehicle driving module, a direct discharge mode is needed to reduce the voltage value of a bus capacitor under two conditions, one condition is that the vehicle driving module needs to perform Active discharge under an ASC state, the working condition mainly occurs under a collision condition, in addition, the system enters an ASC (Active Short Circuit) state by considering CAN bus disconnection, low-voltage KL30 disconnection, rotary transformation disconnection and the like, the motor winding discharge cannot be realized, and at the moment, the vehicle driving module CAN only adopt a bridge arm to perform direct discharge. The other condition is that the motor winding discharge is limited, for example, under the conditions of a rotary transformer fault, a current hall sensor fault, a motor body fault and the like, the motor winding discharge cannot be realized, and at the moment, the vehicle driving module can only adopt the bridge arm direct connection for discharging.

However, in the above situation, if the low-voltage power supply in the vehicle driving module for supplying power to the driving chip in the driving motor controller is powered down due to a fault, the vehicle driving module cannot be maintained in the bridge arm through discharge state, and thus the voltage of the bus capacitor cannot be reduced, and the reliability and safety of the operation of the new energy vehicle driving module are reduced.

Disclosure of Invention

The invention mainly aims to provide a through discharge control circuit, a vehicle driving module and an automobile, and aims to improve the reliability and safety of the vehicle driving module.

In order to achieve the above object, the present invention provides a through discharge control circuit applied to a vehicle driving module, where the vehicle driving module includes a bus capacitor and a three-phase inverter module electrically connected in sequence, the through discharge control circuit includes a first driving module and a second driving module, an output end of the first driving module is electrically connected to a three-phase upper bridge arm switch circuit of the three-phase inverter module, an output end of the second driving module is electrically connected to a three-phase lower bridge arm switch circuit of the three-phase inverter module, and the through discharge control circuit further includes:

the low-voltage power supply module is used for outputting a first voltage;

the high-voltage power supply module is used for outputting a second voltage; one of a driving power supply input end of the first driving module and a driving power supply input end of the second driving module is connected with the output end of the low-voltage power supply module, and the other one of the driving power supply input end of the first driving module and the driving power supply input end of the second driving module is connected with the output end of the high-voltage power supply module;

the input end of the voltage adjusting module is connected with the output end of the high-voltage power supply module, the output end of the voltage adjusting module is connected with the output end of the low-voltage power supply module, the voltage adjusting module is used for outputting a third voltage after voltage adjustment is carried out on the second voltage, and the third voltage is smaller than or equal to the first voltage.

Optionally, the voltage adjustment module includes a voltage-adjustable power supply module, where the voltage-adjustable power supply module has a controlled end, and the controlled end is used for accessing a voltage-adjustable signal;

and the voltage-adjustable power supply module is used for adjusting the voltage of the second voltage according to the received voltage-adjusting signal and then outputting a third voltage corresponding to the voltage-adjusting signal.

Optionally, the voltage adjustment module includes a transformer, an input end of the transformer is connected to an output end of the high-voltage power supply module, and an output end of the transformer is connected to an output end of the low-voltage power supply module;

and the transformer is used for regulating the first voltage according to a preset voltage regulation ratio and then outputting the third voltage.

Optionally, a power end of the high-voltage power supply module is electrically connected to the bus capacitor.

Optionally, the first driving module and the second driving module both have a driving signal input terminal and an ASC terminal, and the through discharge control circuit further includes:

the main control module is respectively and electrically connected with the driving signal input end of the first driving module, the ASC end of the first driving module, the driving signal input end of the second driving module and the ASC end of the second driving module; the main control module is also provided with a signal access end for accessing a lower electric signal/working signal;

the main control module is configured to output corresponding driving signals to a driving signal input end of the first driving module and a driving signal input end of the second driving module when receiving the working signal, so that the first driving module and the second driving module drive the three-phase inverter module to be in a working state;

the main control module is further configured to, when receiving the power-down signal, stop outputting the driving signal to the driving signal input end of the first driving module and the driving signal input end of the second driving module, output a corresponding first ASC signal to the ASC end of the first driving module, and output a second ASC signal to the ASC end of the second driving module, so that the first driving module and the second driving module drive the three-phase inverter module to be in a through discharge state.

Optionally, the first driving module and the second driving module both have driving signal input ends, and the through discharge control circuit further includes:

the output end of the ASC circuit is respectively and electrically connected with the controlled end of the three-phase upper bridge arm switching circuit and the controlled end of the three-phase lower bridge arm switching circuit;

the main control module is electrically connected with the driving signal input end of the first driving module, the driving signal input end of the second driving module and the input end of the ASC circuit respectively; the main control module is also provided with a signal access end for accessing a lower electric signal/working signal;

the main control module is further configured to, when receiving the lower electric signal, stop outputting the driving signal to the driving signal input end of the first driving module and the driving signal input end of the second driving module, and output a corresponding ASC signal to the ASC circuit, so that the ASC circuit drives the three-phase inverter module to be in a through discharge state.

the main control module is electrically connected with the driving signal input end of the first driving module and the driving signal input end of the second driving module respectively; the main control module is also provided with a signal access end for accessing a lower electric signal/working signal;

the second main control module is electrically connected with the ASC end of the first driving module and the ASC end of the second driving module;

the main control module is configured to output a driving signal to a driving signal input end of the first driving module and a driving signal input end of the second driving module when receiving the working signal, so that the first driving module and the second driving module drive the three-phase inverter module to be in a working state;

the main control module is further configured to stop outputting the driving signal to the driving signal input end of the first driving module and the driving signal input end of the second driving module when receiving the power-down signal;

the second main control module is configured to output a corresponding first ASC signal to the ASC end of the first driving module and output a second ASC signal to the ASC end of the second driving module when receiving the lower electrical signal, so that the first driving module and the second driving module drive the three-phase inverter module to be in a through discharge state.

Optionally, the main control module is further configured to control the one-phase bridge arm switching circuit in the through discharge state in the three-phase inverter module to operate in a linear working area when receiving the lower electric signal, so that a current flowing through the one-phase bridge arm switching circuit in the through discharge state is within a safe working current interval of the switching circuit.

Optionally, the main control module is further electrically connected to an enable terminal of the low-voltage power supply module, and the main control module is further configured to control the low-voltage power supply module to stop working when receiving the lower electric signal.

Optionally, the main control module further has a voltage signal access end for accessing a bus capacitor voltage signal;

the main control module is further used for determining the voltage of the bus capacitor according to the bus capacitor voltage signal when the lower electric signal is received, and controlling the one-phase bridge arm switching circuit in the through discharge state in the three-phase inversion module to work in a linear working area when the voltage of the bus capacitor reaches a first preset voltage value, so that the current flowing through the one-phase bridge arm switching circuit in the through discharge state is within a safe working current interval of the switching circuit.

Optionally, the main control module is further electrically connected to an enable end of the low-voltage power supply module, and the main control module is further configured to control the low-voltage power supply module to stop working when receiving the power-down signal.

Optionally, the main control module is further electrically connected to an enable end of the low-voltage power supply module, and a controlled end of the high-voltage power supply module and a controlled end of the voltage adjustment module are respectively electrically connected to the main control module;

the main control module is further configured to output a first setting signal to the controlled end of the high-voltage power supply module and the controlled end of the voltage adjustment module when it is determined that the voltage of the bus capacitor is greater than or equal to a first preset voltage value, so that the high-voltage power supply module outputs the second voltage, and the voltage adjustment module outputs the third voltage;

the main control module is further configured to output a second setting signal to the controlled end of the high-voltage power supply module and the controlled end of the voltage adjustment module when it is determined that the voltage of the bus capacitor is lower than a first preset voltage value, so that the high-voltage power supply module outputs a fourth voltage, and the voltage adjustment module outputs a fifth voltage after performing voltage adjustment on the fourth voltage;

wherein the fourth voltage is greater than the second voltage, and the fifth voltage is greater than the third voltage and less than or equal to the first voltage.

Optionally, the low-voltage power supply module further has a second output end for outputting a sixth voltage, the second output end of the low-voltage power supply module is connected to a power end of the main control module, and the through discharge control circuit further includes a second voltage adjustment module;

the input end of a second voltage adjusting module is connected with the output end of the high-voltage power supply module, the output end of the second voltage adjusting module is connected with the second output end of the low-voltage power supply module, and the second voltage adjusting module is used for adjusting the second voltage and outputting a seventh voltage;

wherein the seventh voltage is less than or equal to the sixth voltage.

The invention also provides a vehicle driving module, which comprises a bus capacitor, a three-phase inversion module and the direct discharge control circuit, wherein the bus capacitor and the three-phase inversion module are arranged in sequence; the three-phase inversion module comprises a three-phase upper bridge arm switching circuit and a three-phase lower bridge arm switching circuit.

The invention also provides an automobile comprising the vehicle driving module.

The through discharge control circuit comprises a first driving module, a second driving module, a low-voltage power module, a high-voltage power module and a voltage adjusting module, wherein one of a driving power input end of the first driving module and a driving power input end of the second driving module is connected with an output end of the low-voltage power module, the other one of the driving power input end of the first driving module and the driving power input end of the second driving module is electrically connected with the high-voltage power module, an input end of the voltage adjusting module is connected with an output end of the high-voltage power module, an output end of the voltage adjusting module is connected with an output end of the low-voltage power module, and the low-voltage power module is used for outputting a first voltage; the high-voltage power supply module is used for outputting a second voltage, the voltage adjusting module is used for performing voltage stabilization adjustment on the second voltage and then outputting a third voltage, and the third voltage is smaller than or equal to the first voltage. Therefore, in practical application, if the low-voltage power supply module suddenly fails due to a fault when the three-phase inverter module is in a direct discharge state, the third voltage output by the voltage adjusting module can also support the normal operation of the first driving module/the second driving module electrically connected with the original low-voltage power supply module. Meanwhile, the other driving module directly powered by the high-voltage power supply module cannot be affected by the fault of the low-voltage power supply module, so that the current three-phase inversion module is still in a direct discharge state, the voltage of the bus capacitor can be gradually reduced to be below a safety value, and the personnel are prevented from being damaged by the high-voltage capacitor. Through the arrangement, the reliability and the safety of the vehicle driving module are effectively improved, and particularly the reliability and the safety of the vehicle driving module during through discharge work are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of an exemplary circuit module of a vehicle drive module;

FIG. 2 is a schematic circuit block diagram of an embodiment of a through discharge control circuit according to the present invention;

FIG. 3 is a schematic circuit block diagram of another embodiment of a through discharge control circuit according to the present invention;

FIG. 4 is a schematic circuit block diagram of another embodiment of a through discharge control circuit according to the present invention;

FIG. 5 is a schematic circuit block diagram of a through discharge control circuit according to yet another embodiment of the present invention;

FIG. 6 is a schematic circuit block diagram of another embodiment of a through discharge control circuit according to the present invention;

FIG. 7 is a schematic circuit block diagram of a through discharge control circuit according to another embodiment of the present invention;

FIG. 8 is a schematic circuit block diagram of a through discharge control circuit according to yet another embodiment of the present invention;

FIG. 9 is a schematic circuit block diagram of another embodiment of a through discharge control circuit according to the present invention;

FIG. 10 is a voltage-current characteristic curve of an IGBT power tube;

fig. 11 is a specific circuit diagram of another embodiment of the through discharge control circuit of the present invention.

The reference numbers indicate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

It should be understood that, referring to fig. 1, in a normal running process of the new energy electric vehicle, the contactor in fig. 1 is in a closed state to connect a path between the three-phase inverter module and the battery, and at this time, the digital controller in fig. 1 controls the T1-T6 transistors to be connected/closed according to a predetermined sequence, so as to drive the motor to rotate, thereby driving the vehicle to run. In fig. 1, the battery pack further has a bus capacitor connected in parallel to two ends of the battery pack, the bus capacitor can smooth the voltage output by the battery pack, when the main contactor is closed, the battery pack can also discharge the bus capacitor, and the bus capacitor can store a large amount of energy. Therefore, when the vehicle is suddenly powered off, that is, when the main contactor is turned off, the bus capacitor still stores a large amount of energy, and if the energy in the bus capacitor cannot be discharged, that is, the voltage of the bus capacitor is reduced, a person may be injured by electric shock.

As can be seen from the background, in both cases, the bridge arm through discharge can only be performed to reduce the bus capacitor voltage. It can be understood that if the vehicle fails due to a collision, which causes the low-voltage power supply module in the vehicle driving module to supply power to the driving chip in the driving motor controller, the vehicle driving module cannot be maintained in a bridge arm direct discharge state, so that the voltage of the bus capacitor cannot be reduced, and the reliability and safety of the new energy vehicle driving module are reduced.

The invention provides a through discharge control circuit which is applied to a vehicle driving module, wherein the vehicle driving module comprises a battery, a bus capacitor and a three-phase inversion module which are sequentially and electrically connected, the through discharge control circuit comprises a first driving module and a second driving module, the output end of the first driving module is electrically connected with a three-phase upper bridge arm switching circuit of the three-phase inversion module, and the output end of the second driving module is electrically connected with a three-phase lower bridge arm switching circuit of the three-phase inversion module. Referring to fig. 2, in an embodiment of the present invention, the through discharge control circuit further includes:

the low-voltage power supply module 10, the low-voltage power supply module 10 is used for outputting a first voltage V1;

the high-voltage power supply module 20, the high-voltage power supply module 20 is used for outputting a second voltage V2; one of a driving power input terminal of the first driving module 60 and a driving power input terminal of the second driving module 70 is connected to an output terminal of the low voltage power module 10, and the other is electrically connected to the high voltage power module 20;

the input end of the voltage adjusting module 30 is connected to the output end of the high voltage power module 20, the output end of the voltage adjusting module 30 is connected to the output end of the low voltage power module 10, the voltage adjusting module 30 is configured to output a third voltage V3 after performing voltage stabilization adjustment on the second voltage V2, and the third voltage V3 is less than or equal to the first voltage V1.

In this embodiment, optionally, the low-voltage power module 10 and the high-voltage power module 20 may be implemented by using a DC/DC voltage regulation module, such as a DC/DC voltage regulation chip, an LLC voltage regulation circuit, and the like; optionally, the implementation may also be implemented by a BUCK circuit including a switching tube, an inductor, a capacitor, and the like. The power supply end of the low-voltage power supply module 10 can be electrically connected with an automobile storage battery of an automobile so as to output a first voltage V1 after the voltage of the automobile storage battery is subjected to corresponding voltage conversion. The power supply terminal of the high voltage power module 20 may be connected to an uninterrupted external voltage source with a higher voltage, or directly electrically connected to a driving battery pack in the vehicle, and output a second voltage V2 after performing voltage conversion corresponding to the voltage of the input voltage. The voltage values of the first voltage V1 and the second voltage V2 may be set by a developer according to actual driving requirements.

Optionally, referring to fig. 2, the output end of the low voltage power module 10 is connected to the driving power input end of the first driving module 60, so as to output the first voltage V1 to the first driving module 60, so as to supply power to the first driving module 60; the output terminal of the high voltage power module 20 is connected to the driving power input terminal of the second driving module 70 to output the second voltage V2 to the second driving module 70 to supply power to the second driving module 70. Optionally, referring to fig. 4, in another embodiment, the output terminal of the low voltage power module 10 may also be connected to the driving power input terminal of the second driving module 70, and the output terminal of the high voltage power module 20 may also be connected to the driving power input terminal of the first driving module 60.

Optionally, in an embodiment, the voltage adjustment module 30 includes a transformer, an input end of the transformer is connected to the output end of the high-voltage power module 20, and an output end of the transformer is connected to the output end of the low-voltage power module; the transformer is used for regulating the first voltage V1 according to a preset transformer ratio and then outputting a third voltage V3. In this embodiment, the transformer may be implemented by using two windings, for example, a primary winding and a secondary winding, the primary winding is electrically connected to the output end of the high-voltage power module 20, the secondary winding is connected to the output end of the low-voltage power module, and the second voltage V2 output by the high-voltage power module 20 is converted by using a turns ratio of the primary winding and the secondary winding, that is, a preset voltage regulation ratio, and then a third voltage V3 is output. Furthermore, the transformer may be implemented using an autotransformer winding.

Optionally, in another embodiment, the voltage adjustment module 30 may also be implemented by using a voltage-adjustable power module, where the voltage-adjustable power module has a controlled end, and the controlled end is used for accessing a voltage-adjusting signal; the voltage-adjustable power supply module is used for adjusting the voltage of the second voltage V2 according to the received voltage-adjustable signal and outputting a third voltage V3 corresponding to the voltage-adjustable signal. In this embodiment, the adjustable power module may be implemented by a DC/DC voltage regulation module, an LLC voltage regulation module, and other voltage regulation modules. It can be understood that the voltage regulating signal may be provided by other circuit modules, or may be provided by the main control module, and a voltage regulating signal may be pre-stored in the main control module by a developer. When the main control module is powered on, the main control module can output a preset voltage regulating signal, so that the voltage-adjustable power supply module outputs a third voltage V3 corresponding to the voltage regulating signal after performing voltage adjustment on the second voltage V2. For example, the current adjustable power supply module is an LLC voltage regulating module, and the main control module may output a voltage regulating signal, which is a PWM signal with a preset duty cycle, to the controlled end of the LLC voltage regulating module, so that the LLC voltage regulating module outputs a third voltage V3 having a voltage value corresponding to the voltage regulating signal.

It is understood that, in order to prevent the voltage from flowing backward, a single-phase conduction circuit (not shown) may be further disposed on the electrical connection path between the output terminal of the voltage adjustment module 30 and the output terminal of the low-voltage power supply module 10, the single-phase conduction circuit may be implemented by using a diode, an anode of the diode is connected to the output terminal of the voltage adjustment module 30, and a cathode of the diode is connected to the output terminal of the low-voltage power supply module 10.

Specifically, referring to fig. 2, the connection relationship in fig. 2 and the U-phase arm switch circuit in the through discharge state are described as an example. If the low voltage power module 10 is powered down due to a failure caused by a vehicle collision, the low voltage power module 10 stops outputting the first voltage V1, and the third voltage V3 output by the voltage adjustment module 30 is the power supply voltage of the first driving module 60 instead of the first voltage V1. It can be understood that, in actual setting, the third voltage V3 is slightly lower than the first voltage V1, so that the first voltage V1 is used as the power supply voltage of the first driving module 60 when the low-voltage power module 10 operates normally. Meanwhile, the high voltage power module 20 still outputs the second voltage V2 to supply power to the second driving module 70, and is not affected by the power failure of the low voltage power module 10. Therefore, the upper bridge arm switching circuit of the U phase can also keep the switching state during the previous through discharge, and the lower bridge arm switching circuit of the U phase can keep the complete conduction state during the previous through discharge. In other words, with the above arrangement, when the low-voltage power supply module 10 is powered down, the voltage adjustment module 30 can output the third voltage V3 as a backup of the first voltage V1 to maintain the first driving module 60 to continue to operate normally, so as to ensure that the current three-phase inverter module is still in the direct discharge state, and thus the voltage of the bus capacitor can be gradually reduced below the safety value.

It is understood that, in the present embodiment, referring to fig. 3, the power source terminal of the high voltage power module 20 is electrically connected to the bus capacitor. According to the above, when the whole vehicle is powered off, the main contactor is opened, the battery pack does not charge the bus capacitor, and at the moment, more energy is stored in the bus capacitor. In the present embodiment, the positive power supply terminal of the power supply terminals of the high voltage power supply module 20 is connected to the first terminal HV + of the bus capacitor, and the negative power supply terminal of the power supply terminals is connected to the second terminal HV-of the bus capacitor. When the whole vehicle is powered on, the main contactor K1 is in a closed state, so that HV + and HV-are respectively and correspondingly connected with the positive electrode and the negative electrode of the battery pack, and the battery pack directly supplies power to the high-voltage power supply module 20. When the whole vehicle is powered off due to vehicle collision, the main contactor K1 is opened, and the bus capacitor directly supplies power to the high-voltage power supply module 20 at the moment. In this way, in the actual through discharge process, the high voltage power module 20 takes electricity from the bus capacitor to output the second voltage V2 to provide the working voltage for the first driving module 60/the second driving module 70 and provide the input voltage for the voltage adjusting module 30, so as to change the phase and accelerate the consumption of the electric energy in the bus capacitor, thereby accelerating the voltage drop speed of the bus capacitor.

The through discharge control circuit comprises a first driving module 60, a second driving module 70, a low-voltage power module 10, a high-voltage power module 20 and a voltage adjusting module 30, wherein one of a driving power input end of the first driving module 60 and a driving power input end of the second driving module 70 is connected with an output end of the low-voltage power module 10, the other one is electrically connected with the high-voltage power module 20, an input end of the voltage adjusting module 30 is connected with an output end of the high-voltage power module 20, an output end of the voltage adjusting module 30 is connected with an output end of the low-voltage power module 10, and the low-voltage power module 10 is used for outputting a first voltage V1; the high-voltage power supply module 20 is configured to output a second voltage V2, the voltage adjustment module 30 is configured to output a third voltage V3 after performing voltage stabilization adjustment on the second voltage V2, and the third voltage V3 is less than or equal to the first voltage V1. In this way, in practical applications, if the low-voltage power module 10 suddenly fails due to a fault when the three-phase inverter module is in the through discharge state, the third voltage V3 output by the voltage adjustment module 30 can also support the normal operation of the first driving module 60/the second driving module 70 electrically connected to the original low-voltage power module 10. Meanwhile, the other driving module directly powered by the high-voltage power supply module 20 is not affected by the fault of the low-voltage power supply module 10, so that the current three-phase inversion module is still in a direct discharge state, the voltage of the bus capacitor can be gradually reduced to be below a safety value, and the personnel are prevented from being damaged by the high-voltage capacitor. Through the arrangement, the reliability and the safety of the work of the vehicle driving module are effectively improved, and particularly the reliability and the safety of the through discharge work are improved.

It should be understood that the driving module may be implemented by using a driving chip, and an under-voltage protection mechanism is often disposed inside the driving chip, as can be seen from the above, when an automobile is collided, the vehicle driving module may reduce the voltage of the bus capacitor by using a direct discharge method, so as to be compatible with the ASC state of the vehicle driving module at this time (in this state, all of the three-phase upper bridge arm circuit/three-phase lower bridge arm circuit are in a conducting state, so as to form a closed loop with the motor stator winding, thereby consuming the back electromotive force generated by the motor stator winding, and preventing the back electromotive force from breaking down the bus capacitor). Meanwhile, due to the impact, the first voltage V1, the second voltage V2, and the third voltage V3 output by the low voltage power module 10, the high voltage power module 20, and the voltage adjustment module 30 may also normally drive the corresponding power tubes to be in a switching state for through discharge, but may be smaller than an under-voltage protection threshold of the driving chip, so that when the main control module 40 outputs the corresponding driving signal to the driving end of the driving module, the driving module does not isolate and amplify the amplitude of the driving signal into the above working voltage and then outputs the working voltage to the controlled end of the power tube to drive the power tube, which makes the current vehicle driving module unable to perform normal through discharge operation.

To this end, in an embodiment of the present invention, referring to fig. 5, each of the first driving module 60 and the second driving module 70 has a driving signal input terminal and an ASC terminal, and the through discharge control circuit further includes:

the main control module 40, the main control module 40 is electrically connected to the driving signal input end of the first driving module 60, the ASC end of the first driving module 60, the driving signal input end of the second driving module 70, and the ASC end of the second driving module 70, respectively; the main control module 40 further has a signal access end for accessing a lower electric signal/working signal;

the main control module 40 is configured to, when receiving the working signal, output a corresponding driving signal to a driving signal input end of the first driving module 60 and a driving signal input end of the second driving module 70, so that the first driving module 60 and the second driving module 70 drive the three-phase inverter module to be in a working state;

the main control module 40 is further configured to stop outputting corresponding driving signals to the driving signal input end of the first driving module 60 and the driving signal input end of the second driving module 70 when receiving the down signal, and output a corresponding first ASC signal to the ASC end of the first driving module 60, and output a second ASC signal to the ASC end of the second driving module 70, so that the first driving module 60 and the second driving module 70 drive the three-phase inverter module to be in the through discharge state.

In this embodiment, the main control module 40 may be implemented by a main controller, such as an MCU, a DSP (Digital Signal processor), an FPGA (Field Programmable Gate Array), and the like. The driving module may be implemented by using a driving chip having an input end and an ASC end, and it is understood that at least one driving chip, for example, three driving chips, may be disposed in the driving module, and an output end of each driving chip may be electrically connected to a controlled end of one phase of the upper bridge arm switching circuit/the lower bridge arm switching circuit in three phases, respectively (not shown in the figure). Specifically, the main control module 40 may have a plurality of driving signal output ends and a plurality of ASC signal output ends, where the plurality of driving signal output ends are used to be connected to the input ends of the plurality of driving chips in a one-to-one correspondence, and the plurality of ASC signal output ends are connected to the ASC ends of the plurality of driving chips in a one-to-one correspondence. The driving signals may include three-phase (U-phase/V-phase/W-phase) upper bridge arm driving signals and three-phase lower bridge arm signals, the first ASC signal includes three-phase upper bridge arm ASC signals, the second ASC signal includes three-phase lower bridge arm ASC signals, the driving chip amplifies the voltage of the received driving signals/ASC signals, that is, amplifies the voltage of the signals to a voltage value of a working voltage, for example, a first voltage V1, a second voltage V2, and a third voltage V3, for example, the ASC signals received by the driving chip corresponding to the U-phase upper bridge arm switching circuit are PWM signals with an amplitude of 3.3V and a preset duty ratio of 50%, the working voltage of the driving chip is a first voltage V1, and the first voltage V1 is 15V. Then the driving chip will output a PWM driving signal with an amplitude of 15V and a duty ratio of 50% to the controlled terminal of the power transistor T1 to drive the power transistor T1 to be in the on-off state. In this way, in practical application, the main control module 40 can drive the three-phase upper bridge arm switching circuit and the three-phase lower bridge arm switching circuit to operate by controlling the six driving chips.

In practical applications, the requirement of the working voltage of the ASC terminal of the driving chip can be satisfied. Optionally, an isolator may be further disposed in the driving module, an input end of the isolator is electrically connected to the main control module 40, an output end of the isolator is connected to the ASC end of the driving module, and the isolator isolates and amplifies an ASC signal output by the main control module 40, for example, a voltage of the first ASC signal, and outputs the ASC signal to the ASC end of the driving module, where it is understood that a power supply end of the isolator may be configured to access the first voltage V1, the second voltage V2, or the third voltage V3; optionally, an ASC isolation amplifying module may be directly integrated inside the driving chip to directly receive the low-voltage ASC signal output by the main control module 40; optionally, the through discharge control circuit may further include a high-voltage controller, and the main control module 40 outputs an ASC signal, for example, after the first ASC signal is output to the high-voltage controller, the high-voltage controller outputs an ASC signal with a higher voltage to the ASC terminal of the corresponding driving chip.

It should be understood that, since the priority of the ASC function of the driving chip is greater than the priority of the under-voltage protection, the driving chip still outputs a corresponding driving voltage to the corresponding power transistor according to the received ASC signal, so as to drive the power transistor to be in an on/off/on state, and the like. Therefore, when the main control module 40 receives the down-signal through the signal output end SI, it stops outputting the corresponding driving signal to the driving signal input end of the first driving module 60 and the driving signal input end of the second driving module 70, and outputs the corresponding first ASC signal to the ASC end of the first driving module 60, and outputs the second ASC signal to the ASC end of the second driving module 70, so as to ensure that the first driving module 60 and the second driving module 70 can still normally output the corresponding driving voltage to the controlled end of the corresponding power tube when the received power supply voltage is smaller than the under-voltage protection threshold, so that the first driving module 60 and the second driving module 70 drive the three-phase inverter module to be in the through discharge state, thereby further improving the reliability of the vehicle driving module in performing the through discharge operation.

In addition, it can be understood that, when the main control module 40 receives the working signal through the signal input terminal SI, the corresponding driving signal is output to the driving signal input terminal of the first driving module 60 and the driving signal input terminal of the second driving module 70, so that the first driving module 60 and the second driving module 70 drive the three-phase inverter module to be in the working state, thereby driving the driving motor to work normally.

Specifically, in the above embodiment, the first driving module 60 and the second driving module 70 collectively include six driving chips for explanation, and referring to fig. 5, the three-phase inverter module in the through discharge state specifically includes:

the three-phase lower bridge arm switching circuits of the three-phase inversion module are all in a conducting state, one phase of upper bridge arm switching circuit in the three-phase upper bridge arm switching circuits is in a switching state, and the other two phases of upper bridge arm switching circuits are in a disconnecting state;

in this embodiment, when the main control module 40 receives the lower electrical signal through the signal receiving terminal SI, the main control module stops outputting the driving signals to the six driving chips in the above embodiment, and outputs the second ASC signal, that is, the three-phase lower arm ASC signal in the above embodiment, and all the three-phase lower arm ASC signals may be high level signals, so that after passing through the corresponding three driving chips, the three driving chips output high level signals to the gate of the power transistor T2, the gate of the power transistor T4, and the gate of the power transistor T6, that is, even if the three driving chips output the second voltage V2 to the gate of the power transistor T2, the gate of the power transistor T4, and the gate of the power transistor T6, the three power transistors are all in a conducting state. Meanwhile, the main control module 40 outputs a first ASC signal. The U-phase upper bridge arm ASC signal in the first ASC signal is a PWM signal with a preset duty ratio (where the preset duty ratio is set by a research and development worker), so that the corresponding driving chip amplifies the received signal and outputs the same PWM driving signal with the preset duty ratio to the gate of the power tube T1, thereby enabling the power tube T1 to be in an on-off state, and both the V-phase upper bridge arm ASC signal and the W-phase upper bridge arm ASC signal can be low-level signals, so that the corresponding driving chip outputs the low-level signals to the power tube T3 and the power tube T5, and the power tube T3 and the power tube T5 are in an off state. Therefore, the U-phase upper bridge arm switching circuit and the U-phase lower bridge arm switching circuit can be in a through discharge state, and the voltage of the bus capacitor is reduced. Meanwhile, the three-phase lower bridge arm switching circuits are all in a conducting state so as to meet the requirement of the ASC state of the vehicle driving module. It can be understood that the power transistor T3 or the power transistor T5 may also be in a switching state, and the power transistors of the other two upper bridge arms are in an off state.

Or the three-phase upper bridge arm switching circuits of the three-phase inversion module are all in a conducting state, one phase lower bridge arm switching circuit in the three-phase lower bridge arm switching circuits is in a switching state, and the other two phases lower bridge arm switching circuits are in a disconnecting state;

similarly to the above embodiment, still taking the U-phase upper bridge arm switching circuit and the U-phase lower bridge arm switching circuit in the through discharge state as an example for explanation, in this embodiment, the three-phase upper bridge arm switching circuits are all controlled to be in the on state, that is, the power tube T1, the power tube T3, and the power tube T5 are controlled to be in the on state, the power tube T2 is controlled to be in the on state, and the power tube T4 and the power tube T6 are controlled to be in the off state.

Or, in the three-phase inversion module, both the upper bridge arm switching circuit and the lower bridge arm switching circuit of one phase are in a switching state, one of the upper bridge arm switching circuit and the lower bridge arm switching circuit of the other two phases is in a conducting state, and the other one of the upper bridge arm switching circuit and the lower bridge arm switching circuit of the other two phases is in a switching-off state.

Similarly to the foregoing embodiment, still taking the example that the U-phase upper bridge arm switching circuit and the U-phase lower bridge arm switching circuit are in the through discharge state as an example, in this embodiment, the power tube T1 and the power tube T2 are controlled to be in the switching states, and it can be understood that the power tube T1 and the power tube T2 should be in the on-state and the off-state in the switching states at the same time. Meanwhile, the power transistor T3 and the power transistor T5 are controlled to be in one of the on state and the off state, and the power transistor T4 and the power transistor T6 are controlled to be in the other state. Therefore, the U-phase upper bridge arm switching circuit and the U-phase lower bridge arm switching circuit can be in a through discharge state, and the voltage of the bus capacitor is reduced. Meanwhile, the three-phase lower bridge arm switching circuits are all in a conducting state so as to meet the requirement of the ASC state of the vehicle driving module.

It is to be understood that in practical cases, some of the driver chips do not have ASC functionality, i.e. do not have ASC ports. To this end, referring to fig. 6, in another embodiment of the present invention, the first driving module 60 and the second driving module 70 each have a driving signal input terminal, and the through discharge control circuit further includes:

the output end of the ASC circuit 80 is respectively and electrically connected with the controlled end of the three-phase upper bridge arm switching circuit and the controlled end of the three-phase lower bridge arm switching circuit;

the main control module 40, the main control module 40 is electrically connected to the driving signal input terminal of the first driving module 60, the driving signal input terminal of the second driving module 70 and the input terminal of the ASC circuit 80, respectively; the main control module 40 further has a signal access end for accessing a lower electric signal/working signal;

the main control module 40 is configured to output corresponding driving signals to a driving signal input end of the first driving module 60 and a driving signal input end of the second driving module 70 when receiving the working signal, so that the first driving module 60 and the second driving module 70 drive the three-phase inverter module to be in a working state;

the main control module 40 is further configured to stop outputting the driving signals to the driving signal input end of the first driving module 60 and the driving signal input end of the second driving module 70 when receiving the down signal, and output corresponding ASC signals to the ASC circuit 80, so that the ASC circuit 80 drives the three-phase inverter module to be in the through discharge state.

In this embodiment, the main control module 40 is the same as the device adopted in the above embodiment, the ASC circuit 80 includes an upper bridge arm ASC circuit and a lower bridge arm ASC circuit, a power supply end of the upper bridge arm ASC circuit is electrically connected to a driving power supply input end of the first driving module 60, and similarly, a power supply end of the lower bridge arm ASC circuit may be electrically connected to a driving power supply input end of the second driving module 70. In other words, the power supply terminal of the upper arm ASC circuit is electrically connected to the output terminal of the low-voltage power supply module 10, and the power supply terminal of the lower arm ASC circuit is electrically connected to the output terminal of the high-voltage power supply module 20. Specifically, the upper arm ASC circuit and the lower arm ASC circuit may be implemented by using an amplifier or an optocoupler. It can be understood that the number of the upper bridge arm ASC circuits and the lower bridge arm ASC circuits may be three, the output ends of the three upper bridge arm ASC circuits are electrically connected to the controlled ends of the three-phase upper bridge arm switch circuits, respectively, and the output ends of the three lower bridge arm ASC circuits are electrically connected to the controlled ends of the three-phase lower bridge arm switch circuits, respectively. Any upper bridge arm ASC circuit/lower bridge arm ASC circuit amplifies the ASC signal output from the input terminal of the main control module 40 and outputs the amplified signal to the controlled terminal of the corresponding one-phase upper bridge arm switching circuit/controlled terminal of the lower bridge arm switching circuit, that is, amplifies the voltage value of the ASC signal to the voltage input to the driving power supply input terminal and outputs the amplified voltage. It is to be understood that, referring to the contents of the above-described embodiments, the ASC signals include a first ASC signal composed of U-phase/V-phase/W-phase upper arm ASC signals and a second ASC signal composed of U-phase/V-phase/W-phase lower arm ASC signals.

Specifically, when the main control module 40 receives the down signal, as in the above embodiment, the output of the driving signals to the driving signal input terminal of the first driving module 60 and the driving signal input terminal of the second driving module 70 is stopped, so as to control all the driving chips to stop working. Meanwhile, the main control module 40 outputs the first ASC signals, that is, U-phase/V-phase/W-phase upper bridge arm ASC signals, to the input terminals of the three upper bridge arm ASC circuits, and outputs the second ASC signals, that is, U-phase/V-phase/W-phase lower bridge arm ASC signals, to the input terminals of the three lower bridge arm ASC circuits, so that the three upper bridge arm ASC circuits and the three lower bridge arm ASC circuits amplify the input ASC signals and output corresponding driving voltages to the controlled terminals of the power tubes in the corresponding three-phase upper bridge arm switching circuits and three-phase lower bridge arm switching circuits, so that the three-phase inverter module is in a through discharge state. The contents of the above embodiments can be referred to for the through discharge state, and details are not repeated here. Meanwhile, the plurality of ASC signals in this embodiment may be PWM signals as the first ASC signal and the second ASC signal, and for a specific driving process, reference may be made to the embodiment in fig. 5, which is not described herein again. Thus, with the above arrangement, in practical applications, if the driving chips in the first driving module 60 and the second driving module 70 do not have the ASC function, the received power supply voltage can still output the corresponding driving voltage to the controlled end of the corresponding power tube through the ASC circuit 80 when being less than the under-voltage protection threshold, so that the three-phase inverter module can be in the through discharge state.

In addition, referring to fig. 7, in another embodiment of the present invention, the first driving module 60 and the second driving module 70 each have a driving signal input terminal and an ASC terminal, and the shoot-through discharge control circuit further includes:

the main control module 40, the main control module 40 is electrically connected to the driving signal input terminal of the first driving module 60 and the driving signal input terminal of the second driving module 70 respectively; the main control module 40 further has a signal access end for accessing the lower electric signal/working signal;

the second main control module 90, the second main control module 90 is electrically connected to the ASC terminal of the first driving module 60 and the ASC terminal of the second driving module 70;

the main control module 40 is configured to output a driving signal to a driving signal input end of the first driving module 60 and a driving signal input end of the second driving module 70 when receiving the working signal, so that the first driving module 60 and the second driving module 70 drive the three-phase inverter module to be in a working state;

the main control module 40 is further configured to stop outputting the driving signal to the driving signal input end of the first driving module 60 and the driving signal input end of the second driving module 70 when receiving the lower electric signal;

the second main control module 90 is configured to output a corresponding first ASC signal to the ASC end of the first driving module 60 and output a second ASC signal to the ASC end of the second driving module 70 when receiving the lower electrical signal, so that the first driving module 60 and the second driving module 70 drive the three-phase inverter module to be in a through discharge state.

In this embodiment, the second main control module 90 is implemented by a main controller, such as an MCU (micro controller unit), a DSP (Digital Signal processing) chip, an FPGA (Field Programmable Gate Array) chip, and the like, as in the main control module 40 in the above embodiment. It will be appreciated that the main controller described above is implemented as a high voltage controller capable of withstanding a high operating voltage, for example a high voltage controller capable of withstanding an operating voltage of greater than 20V. Specifically, referring to fig. 7, the second main control module 90 includes a first high voltage controller and a second high voltage controller, the first high voltage controller is electrically connected to the ASC terminal of the first driving module 60, the second high voltage controller is electrically connected to the ASC terminal of the second driving module 70, and the first high voltage controller and the second high voltage controller also have signal access terminals for accessing the lower electrical signal/working signal. When the first high-voltage controller and the second high-voltage controller receive the working signal, no signal is output to the ASC end of the corresponding driving module. When the first high-voltage controller and the second high-voltage controller receive the down electrical signal, the first high-voltage controller and the second high-voltage controller output corresponding first ASC signals to the ASC terminal of the first driving module 60 and output corresponding second ASC signals to the ASC terminal of the second driving module 70, so that the first driving module 60 and the second driving module 70 drive the three-phase inverter module to be in the through discharge state. It can be understood that the first ASC signal and the second ASC signal output in this embodiment are the same as those in the embodiment in fig. 5, and the driving process is the same, which is not described herein again. So, in practical application, compare and export the ASC end to corresponding drive module after enlargiing the low pressure ASC signal of main control module 40 output, adopt high-voltage controller direct output to be the ASC end of high pressure ASC signal to corresponding drive module, can effectually guarantee the accuracy of ASC signal, the ASC signal can not appear receiving the condition that disturbs and lead to signal distortion at the amplification in-process, and then improved the reliability and the stability of direct discharge control circuit work.

It should be understood that if the vehicle is just powered down, the voltage of the battery pack is still higher, for example, the full voltage of the battery pack is 400V, and if the vehicle is just powered down, 300V is still left. At this time, the voltage of the bus capacitor is also relatively high, and if the through discharge process is still performed at this time, the current flowing through the U-phase arm switch circuit is excessively large, which may cause damage to the U-phase arm switch circuit.

For this reason, referring to fig. 5 and fig. 6, in combination with the content of the embodiment of fig. 5 and fig. 6, in an embodiment of the present invention, when receiving the down electrical signal, the main control module 40 is further configured to control the one-phase bridge arm switch circuit in the through discharge state in the three-phase inverter module to operate in the linear operating area, so that the current flowing through the one-phase bridge arm switch circuit in the through discharge state is within the safe operating current interval of the switch circuit.

It should be understood that, in this embodiment, the power transistor may be an IGBT power transistor, and reference is first made to fig. 10, where fig. 10 is a voltage-current characteristic curve of the IGBT power transistor in any phase of the upper arm switching circuit/the lower arm switching circuit in fig. 1-9. When the driving voltage output to the grid electrode of the IGBT power tube is small, the IGBT power tube can work in a linear working area, at the moment, the IGBT power tube can be equivalently analogized to a resistor with large impedance, so that the current flowing through the IGBT power tube is limited, and the current value of the IGBT power tube is limited in a safe working current interval of the switching circuit. The current value of the current is determined by the equivalent resistance value of the single IGBT power tube when the single IGBT power tube works in the linear working area and the voltage with the maximum bus capacitance (namely the full-electricity voltage of the battery pack). It can be understood that, a developer may select an appropriate type of IGBT power tube, so that a current flowing through a phase bridge arm switching circuit in a through discharge state is within a safe operating current interval of the IBGT power tube in the phase bridge arm switching circuit.

In this embodiment, as can be seen from the above description in conjunction with the embodiments of fig. 5 and fig. 6, when the main control module 40 receives the down signal, the first ASC signal and the second ASC signal are output, so that the three-phase inverter module is in the through discharge state. For the one-phase bridge arm switching circuit in the through discharge state, the main control module can output the one-phase upper bridge arm ASC signal and/or the upper bridge arm ASC signal which are/is a preset linear working duty ratio PWM signal, so that the one-phase bridge arm switching circuit works in a linear working area, and the current flowing through the one-phase bridge arm switching circuit in the through discharge state is in a safe working current interval of the switching circuit. Specifically, taking fig. 5 as an example for explanation, with reference to the content in the foregoing embodiment, when the main control module 40 receives the lower electric signal, the output V-phase/W-phase upper bridge arm ASC signal is a low level signal and is sent to the ASC end of the corresponding driving chip in the first driving module, so that the power tube T3 and the power tube T5 are in an off state, and the output U-phase upper bridge arm ASC signal which is a PWM signal with a preset linear working duty ratio is sent to the ASC end of the driving chip of the corresponding power tube T1 in the first driving module, so that the power tube T1 works in the linear working area, and thus, the current flowing through the U-phase bridge arm switching circuit is within the safe working current interval of the power tube.

Optionally, in another embodiment, the main control module 40 is further electrically connected to an enable terminal of the low voltage power supply module 10, and the main control module 40 further controls the low voltage power supply module 10 to stop working when receiving a power-off signal. It can be understood that the received power-off signal is not only the vehicle power-off signal that the vehicle main controller outputs when determining that the vehicle needs to be powered off; the vehicle through discharge signal of the through discharge strategy is adopted when the current vehicle is powered off, and the vehicle main controller judges that the current vehicle is in a rotating fault state, CAN (controller area network) disconnection and other faults.

In this embodiment, as can be seen from the above description of the embodiments in fig. 5 and fig. 6, when the main control module 40 receives the down electrical signal, it outputs at least one ASC signal that is a PWM signal with a preset duty ratio, so that a certain phase bridge arm switching circuit is in a through discharge state. At this time, the main control module 40 may also actively control the low-voltage power module 10 to stop working, so that the third voltage V3 replaces the first voltage V1 to supply power to the driving chip in the first driving module 60/the driving chip in the second driving module 70, so that when the corresponding driving chip receives the ASC signal which is the preset duty ratio PWM signal, the actual voltage output to the corresponding power tube can make the power tube in the linear working area, even if the one-phase bridge arm switching circuit in the through discharge state works in the linear working area, so that the current flowing through the one-phase bridge arm switching circuit in the through discharge state is within the safe working current interval of the switching circuit. In this way, in practical application, the main control module 40 does not need to change the duty ratio of the output ASC signal, and it can be understood that, when the voltage of the bus capacitor is low, the main control module 40 can also restart the low-voltage power supply module 10 actively, so that the power tube in the linear working area is restored to the on-off state, that is, restored to the switching between the saturation on state and the complete off state, thereby accelerating the discharging speed of the bus capacitor.

Specifically, referring to fig. 5, taking the embodiment in fig. 5 as an example for explanation, it should be noted that the embodiment is also applicable to the content of the embodiment in fig. 6, and the third voltage V3 may be preset in advance by a developer, so that the driving chip corresponding to the power tube T1 in the first driving module 60 can enable the power tube T1 to operate in the linear operating region according to the received ASC signal which is the preset duty ratio PWM signal and the PWM driving signal output by the third voltage V3. Optionally, the second voltage V2 may also be set by a developer, so that the power transistor T2 can work in the linear operating region when the second driving module 70 outputs a high-level signal to the power transistor T2, that is, when the second voltage V2 is output to the gate of the power transistor T2. Optionally, the second voltage V2 is also set by a developer, so that when the corresponding driving chip in the second driving module 70 outputs a high-level signal to the power tube T2, that is, when the second voltage V2 is output to the gate of the power tube T2, the current power tube T2 can be kept in a fully-on state. In this way, since the power supply voltage of the second driving module 70 is the second voltage V2, at this time, the high-level signals output to the power tube T4 and the power tube T6 by the driving chips of the other two phases of the second driving module 70 can also keep the power tube T4 and the power tube T6 in a fully conducting state, so as not to affect the speed of releasing the back electromotive force from the stator winding of the motor.

When the main control module 40 receives the power-down signal, the low voltage power module 10 is actively controlled to stop working, so that the third voltage V3 replaces the first voltage V1 to start supplying power to the first driving module 60. Therefore, the power tube T1 of the U-phase upper bridge arm switching circuit can work in a linear working area, so that the current flowing through the U-phase upper bridge arm switching circuit is in a safe working current interval of the power tube T1, and the condition that the voltage of the bus capacitor is too high to cause damage to the flowing power tube is prevented.

It can be understood that, with reference to the above embodiments, when the working voltage of the driving chip in the driving module is lower than the undervoltage protection threshold, the driving module is in an undervoltage protection state, and the driving chip cannot output a corresponding driving voltage by outputting a driving signal to the driving end. As can be seen from the above, in order to make the corresponding power transistor operate in the linear operating region, a lower driving voltage needs to be output, i.e. the actual third voltage V3 is lower than the undervoltage protection threshold of the driving chip. Therefore, in combination with the above embodiment, the main control module 40 outputs the corresponding ASC signal to the ASC terminal of the corresponding driving module, so that not only the operation of the first driving module 60 and the second driving module 70 can be still ensured when the first voltage V1 output by the low-voltage power supply module 10 due to vehicle collision is lower than the undervoltage protection threshold, but also the first driving module 60 and the second driving module 70 can drive the one-phase bridge arm switching circuit in the through discharge state to operate in the linear operating region when the bus voltage is too high, so as to prevent the power tube flowing through from being damaged due to the too high voltage of the bus capacitor.

Optionally, in another embodiment of the present invention, with reference to fig. 8 in combination with the content in the foregoing embodiment, the main control module 40 further has a voltage signal access terminal VSI for accessing a voltage signal of the bus capacitor, and the main control module 40 is further electrically connected to an enable terminal of the low-voltage power supply module 10;

the main control module 40 is further configured to determine a voltage of the bus capacitor according to the bus capacitor voltage signal when the lower electric signal is received, and control the one-phase bridge arm switching circuit in the through discharge state in the three-phase inverter module to operate in the linear working area when the voltage of the bus capacitor reaches a first preset voltage value, so that the current flowing through the one-phase bridge arm switching circuit in the through discharge state is within a safe working current interval of the switching circuit.

In this embodiment, a voltage detection circuit may be further disposed in the vehicle driving module, and the voltage detection circuit may be implemented by a voltage dividing circuit formed by two resistors, an input end of the voltage dividing circuit is connected to the first end HV + of the bus capacitor, and an output end of the voltage dividing circuit is electrically connected to the voltage signal input end VSI of the main control module 40. The main control module 40 can calculate the voltage of the current bus capacitor according to the bus capacitor voltage signal output by the voltage dividing circuit and the known preset resistance ratio. If the voltage of the present bus capacitor is higher than the first preset voltage value, the main control module 40 may consider that the voltage of the present bus capacitor is too high, and the current may be too large in the through discharge process. Therefore, the main control module 40 executes the operations in the above embodiments, that is, in the above embodiments, the ASC signal which is the PWM signal with the preset linear duty ratio is output to the corresponding driving chip in the corresponding driving module, so that the one-phase bridge arm switching circuit in the through discharge state operates in the linear working area, and the current flowing through the one-phase bridge arm switching circuit in the through discharge state is within the safe working current interval of the switching circuit. For the specific process, reference is made to the process of the above embodiment, which is not described herein again.

It can be understood that, if the voltage of the current bus capacitor does not reach the first preset voltage value, the main control module 40 outputs an ASC signal that is a PWM signal with a preset duty ratio to a corresponding driving chip in the corresponding driving module, so that the one-phase bridge arm switching circuit in the through discharge state is restored to the switching state, that is, the power tube in the switching circuit is switched between the saturation on state and the complete off state, thereby accelerating the discharge speed of the bus capacitor.

In addition, in another embodiment, the main control module 40 is further electrically connected to an enable terminal of the low voltage power module 10, and the main control module 40 is further configured to control the low voltage power module 10 to stop operating when receiving the power-off signal.

In this embodiment, with reference to the above embodiments, when receiving the down signal, the main control module 40 outputs at least one ASC signal that is a PWM signal with a preset duty ratio, so that a switching circuit of a certain phase bridge arm is in a through discharge state. When the main control module 40 determines that the bus voltage is greater than the first preset voltage value according to the bus capacitor voltage signal, the low-voltage power module 10 is actively controlled to stop working, so that the third voltage V3 replaces the first voltage V1 to supply power to the driving chip in the first driving module 60/the driving chip in the second driving module 70, so that when the corresponding driving chip receives the ASC signal which is the preset duty ratio PWM signal, the actual voltage output to the corresponding power tube can make the power tube in the linear working area, even if the one-phase bridge arm switching circuit in the through discharge state works in the linear working area, so that the current flowing through the one-phase bridge arm switching circuit in the through discharge state is in the safe working current interval of the switching circuit. In this way, in practical application, the main control module 40 does not need to change the duty ratio of the output ASC signal, and it can be understood that, when the voltage of the bus capacitor is low, the main control module 40 can also restart the low-voltage power supply module 10 actively, so that the power tube in the linear working area is restored to the on-off state, that is, restored to the switching between the saturation on state and the complete off state, thereby accelerating the discharging speed of the bus capacitor.

In addition, in another embodiment, as will be understood from the above description of the embodiments of fig. 5 and 6, the voltages output by the high-voltage power module 20 and the voltage adjustment module 30 can also be actively adjusted by the main control module 40 according to the voltage of the bus capacitor, referring to fig. 8, in an embodiment of the present invention, the controlled end of the high-voltage power module 20 and the controlled end of the voltage adjustment module 30 are respectively electrically connected to the main control module 40;

the main control module 40 is further configured to, when it is determined that the voltage of the bus capacitor reaches a first preset voltage value, control the low-voltage power supply module 10 to stop working, and output a first setting signal to the controlled end of the high-voltage power supply module 20 and the controlled end of the voltage adjustment module 30, so that the high-voltage power supply module 20 outputs a second voltage V2, and the voltage adjustment module 30 outputs a third voltage V3;

the main control module 40 is further configured to, when it is determined that the voltage of the bus capacitor is lower than the first preset voltage value, control the low-voltage power supply module 10 to recover to the working state, and output a second setting signal to the controlled end of the high-voltage power supply module 20 and the controlled end of the voltage adjustment module 30, so that the high-voltage power supply module 20 outputs a fourth voltage V4, and the voltage adjustment module 30 adjusts the voltage of the fourth voltage V4 and outputs a fifth voltage V5;

the fourth voltage V4 is greater than the second voltage V2, and the fifth voltage V5 is greater than the third voltage V3 and less than or equal to the first voltage V1.

As can be seen from the above, the high voltage power module 20 and the voltage adjustment module 30 can be implemented by a DC/DC voltage adjustment module, such as a DC/DC voltage adjustment chip. It should be understood that the DC/DC voltage regulating chip has a voltage feedback terminal, and according to a chip manual, a corresponding peripheral resistor is set to adjust a voltage value accessed by the voltage feedback terminal, so as to set an actual voltage value output by the DC/DC voltage regulating chip.

Specifically, referring to fig. 11, the voltage adjustment module 30 includes a DC/DC voltage regulation module, a first resistor R1, a second resistor R2, a third resistor R3, and a switching tube K2, and the high voltage power module 20 includes a DC/DC voltage regulation module, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a switching tube K3. When the main control module 40 controls the switching tube K2 and the switching tube K3 to be in a disconnected state, the first resistor R1 and the second resistor R2 are connected in series, and the voltage adjustment module 30 outputs a third voltage V3; the fourth resistor R4 and the fifth resistor R5 are connected in series, and the high voltage power module 20 outputs a second voltage V2. When the main control module 40 controls the switching tube K2 and the switching tube K3 to be in a conducting state, the second resistor R2 and the third resistor R3 are connected in parallel and then connected in series with the first resistor R1, and the voltage adjusting module 30 outputs a fifth voltage V5; the fifth resistor R5 and the sixth resistor R6 are connected in parallel and then connected in series with the fourth resistor R4, and the high-voltage power module 20 outputs a fourth voltage V4.

In this embodiment, with reference to the above embodiments, the second voltage V2 output by the high-voltage power supply module 20 and the third voltage V3 output by the voltage adjustment module 30 can enable both the upper arm switch circuit and the lower arm switch circuit in a dc-on state to operate in a linear operating region, so that the current flowing through the arm of the phase is smaller than or equal to a preset current value, and damage to the flowing power tube due to an excessively high voltage of the bus capacitor is prevented.

The fourth voltage V4 output by the high-voltage power supply module 20 and the fifth voltage V5 output by the voltage adjustment module 30 can make one of the upper arm switch circuit and the lower arm switch circuit in a certain phase arm circuit in the dc conduction state be in the on-off state, and the other one be in the complete conduction state.

Specifically, referring to fig. 8 and 11, the embodiment in fig. 8 and 11 is taken as an example for explanation, and it is understood that the contents of the above embodiment are also applicable to the embodiment in fig. 6.

When the main control module 40 receives the lower electric signal, the current voltage value of the bus capacitor is determined according to the bus capacitor voltage signal.

If the voltage value of the bus capacitor reaches the first preset voltage value, the main control module 40 determines that the voltage of the bus capacitor is too high, and controls the switching tube K2 and the switching tube K3 to be in an open state, so that the voltage stabilization driving module outputs the third voltage V3, and the high voltage power supply module 20 outputs the second voltage V2. Meanwhile, the main control module 40 controls the low voltage power module 10 to stop working, so that the third voltage V3 replaces the first voltage V1 as the power supply voltage of the first driving module 60. At this time, the power supply voltage of the first driving module 60 is the third voltage V3, and the power supply voltage of the second driving module 70 is the fourth voltage V4, as can be seen from the above embodiment, at this moment, both the power tube T1 and the power tube T2 work in the linear working region, so that the current output by the bus capacitor is limited to be less than or equal to the first preset current value.

If the voltage of the bus capacitor is smaller than the first preset voltage value, the main control module 40 determines that the voltage of the current bus capacitor has dropped, and controls the switching tube K2 and the switching tube K3 to be in a closed state. In combination with the above embodiments, at this moment, the power tube T1 will be restored to the on-off state, and the power tube T2 will be restored to the fully-on state, so as to accelerate the voltage drop speed of the bus capacitor.

Through the arrangement, the current output by the bus capacitor can be limited when the voltage of the bus capacitor is higher, and the corresponding switch tube can be recovered to a conventional switch state when the voltage of the bus capacitor is lower than a first preset voltage value, so that the voltage reduction speed of the bus capacitor is increased, and the working flexibility of the direct discharge control circuit is effectively improved. In addition, in practical application, if the low-voltage power supply module 10 fails to work and causes power failure, the main control module 40 can still switch the bridge arm switch circuit of a certain phase in the dc conduction state in the linear working area/switching state through the above process, thereby further improving the flexibility and reliability of the operation of the through discharge control circuit.

Referring to fig. 9, in an embodiment of the present invention, the low-voltage power module 10 further has a second output terminal for outputting a sixth voltage V6, the second output terminal of the low-voltage power module 10 is connected to the power terminal of the main control module 40, and the through-discharge control circuit further includes a second voltage adjustment module 50;

the input end of the second voltage adjusting module 50 is connected to the output end of the high-voltage power module 20, the output end of the second voltage adjusting module 50 is connected to the second output end of the low-voltage power module 10, and the second voltage adjusting module 50 is configured to output a seventh voltage V7 after adjusting the voltage of the second voltage V2;

wherein the seventh voltage V7 is less than or equal to the sixth voltage V6.

In this embodiment, the low voltage power module 10 may further include a plurality of DC/DC voltage regulation circuits, for example, two DC/DC voltage regulation circuits, one DC/DC voltage regulation circuit converts the voltage of the automobile battery in the automobile and outputs a first voltage V1 to supply power to the driving module, and the other DC/DC voltage regulation circuit converts the voltage of the automobile battery in the automobile and outputs a sixth voltage V6 to the main control module 40 to provide a working voltage for the main control device in the main control module 40. It is understood that the second voltage adjustment module 50 can be implemented by the same circuit as the voltage adjustment module 30, and the description thereof is omitted here. Therefore, in the actual working process, if the low-voltage power supply module 10 is powered off abnormally, the second voltage adjustment module 50 outputs the seventh voltage V7 to replace the sixth voltage V6 to supply power to the main control module 40, so that the main control module 40 can still keep a normal working state under the condition that the low-voltage power supply module 10 which originally provides working voltage is powered off, and the reliability and the safety of the work of the direct discharge control circuit and the vehicle driving module are effectively improved.

The invention also provides a vehicle driving module, which comprises a battery, a bus capacitor and a three-phase inversion module which are electrically connected in sequence, and the direct discharge control circuit; the three-phase inversion module comprises a three-phase upper bridge arm switching circuit and a three-phase lower bridge arm switching circuit.

It should be noted that, because the vehicle driving module of the present invention is based on the through discharge control circuit, the embodiment of the vehicle driving module of the present invention includes all technical solutions of all embodiments of the through discharge control circuit, and the achieved technical effects are also completely the same, and are not described herein again.

The invention further provides an automobile comprising the automobile driving module.

It should be noted that, because the vehicle of the present invention is based on the vehicle driving module, the embodiment of the vehicle of the present invention includes all technical solutions of all embodiments of the vehicle driving module, and the achieved technical effects are also completely the same, and are not described herein again.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a direct discharge control circuit, is applied to vehicle drive module, vehicle drive module is including electric connection bus-bar capacitance and three-phase contravariant module in proper order, direct discharge control circuit includes first drive module and second drive module, the output of first drive module with the three-phase of three-phase contravariant module is gone up the bridge arm switch circuit and is connected, the output of second drive module with the three-phase of three-phase contravariant module is put the bridge arm switch circuit electricity down and is connected, its characterized in that, direct discharge control circuit still includes:

the low-voltage power supply module is used for outputting a first voltage;

the input end of the voltage adjusting module is connected with the output end of the high-voltage power supply module, the output end of the voltage adjusting module is connected with the output end of the low-voltage power supply module, the voltage adjusting module is used for adjusting the second voltage and then outputting a third voltage, and the third voltage is smaller than or equal to the first voltage;

the first driving module and the second driving module are provided with driving signal input ends and ASC ends, and the through discharge control circuit further comprises:

2. The shoot-through discharge control circuit of claim 1 wherein the voltage regulation module comprises a voltage-regulated power supply module having a controlled terminal for receiving a voltage-regulated signal;

3. The shoot through discharge control circuit of claim 1 wherein the voltage regulation module comprises a transformer, an input of the transformer being connected to the output of the high voltage power supply module, an output of the transformer being connected to the output of the low voltage power supply module;

4. The shoot-through discharge control circuit of claim 1 wherein the power terminals of said high voltage power supply module are electrically connected to said bus capacitor.

5. The through-discharge control circuit according to claim 1, wherein the low-voltage power supply module further has a second output terminal for outputting a sixth voltage, the second output terminal of the low-voltage power supply module being connected to the power supply terminal of the main control module, the through-discharge control circuit further comprising a second voltage adjustment module;

the input end of the second voltage adjusting module is connected with the output end of the high-voltage power supply module, the output end of the second voltage adjusting module is connected with the second output end of the low-voltage power supply module, and the second voltage adjusting module is used for adjusting the second voltage and outputting a seventh voltage;

wherein the seventh voltage is less than or equal to the sixth voltage.

6. A vehicle drive module comprising, in sequence, a bus capacitor and a three-phase inverter module, and a shoot-through discharge control circuit as claimed in any one of claims 1 to 5; the three-phase inversion module comprises a three-phase upper bridge arm switching circuit and a three-phase lower bridge arm switching circuit.

7. An automobile, characterized by comprising the vehicle drive module according to claim 6.