Motor controller circuit protection system and vehicle

Abstract

The invention provides a motor controller circuit protection system and a vehicle, and relates to the technical field of motor control, the system comprises a voltage conversion module and a detection protection module; the first end of the voltage conversion module is electrically connected with a battery, and the second end of the voltage conversion module is electrically connected with a motor; the detection protection module comprises a voltage acquisition unit, a current acquisition unit and a temperature acquisition unit, the voltage acquisition unit is used for acquiring the output voltage boosted by the voltage conversion module, the current acquisition unit is used for acquiring the input current before boosting by the voltage conversion module, and the temperature acquisition module is used for acquiring the circuit temperature; the circuit temperature comprises the inductance temperature of an inductor in the voltage conversion module and / or the transistor temperature in the motor controller circuit; and the detection protection module is used for determining a circuit protection strategy according to at least one of the output voltage, the input current or the circuit temperature, and is used for monitoring the motor controller circuit and eliminating potential safety hazards.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control, and in particular to a motor controller circuit protection system and a vehicle. Background Art

[0002] In electric vehicles, the motor controller is the core component of the vehicle, and its design has a decisive impact on the vehicle's power performance and economic performance. After receiving the command, the motor controller modulates the electric energy to obtain the voltage and current that directly drive the motor to work, so that the motor meets the needs of the entire vehicle. When the load end changes, the battery voltage fluctuates, and the variability of the external environment will also affect the stability of the voltage. The battery cannot guarantee the stability of the voltage alone.

[0003] In some solutions, a boost system is added to block fluctuations in the battery input voltage and ensure the stability of the battery voltage. However, when the voltage is boosted, a voltage difference is formed at both ends of the circuit, which in turn generates a loop voltage, causing the current in the circuit to fluctuate and the temperature to rise abnormally. In severe cases, it may cause damage to the controller or even damage to the high-voltage system, resulting in a safety accident. Summary of the invention

[0004] The problem solved by the present invention is how to monitor the motor controller circuit and eliminate potential safety hazards.

[0005] In order to solve the above problems, the present invention provides a motor controller circuit protection system, including a voltage conversion module and a detection protection module;

[0006] The first end of the voltage conversion module is used to be electrically connected to a battery, and the second end of the voltage conversion module is used to be electrically connected to a motor, wherein the voltage conversion module includes a first conversion unit and a second conversion unit that are staggered in parallel, the first conversion unit includes a first inductor and a first bridge arm, the second conversion unit includes a second inductor and a second bridge arm, the second end of the first inductor is electrically connected to the midpoint of the first bridge arm, the second end of the second inductor is electrically connected to the midpoint of the second bridge arm, the first end of the first inductor is connected to the first end of the second inductor to form the first end of the voltage conversion module, and the first bridge arm and the second bridge arm are connected in parallel to form the second end of the voltage conversion module;

[0007] The detection protection module includes a voltage acquisition unit, a current acquisition unit and a temperature acquisition unit, wherein the voltage acquisition unit is used to acquire the output voltage after the voltage conversion module is boosted, the current acquisition unit is used to acquire the input current of the voltage conversion module before the voltage is boosted, and the temperature acquisition module is used to acquire the circuit temperature, wherein the circuit temperature includes the inductor temperature of the inductor in the voltage conversion module and / or the transistor temperature in the motor controller circuit;

[0008] The detection protection module is used to output a preset circuit protection strategy according to at least one of the output voltage, the input current or the circuit temperature.

[0009] Compared with the background technology, the present invention reduces the current flowing through a single inductor by setting a first conversion unit and a second conversion unit that are staggered in parallel in the voltage conversion module, and reduces the risk of over-temperature and over-current of the transistor by setting a first bridge arm and a second bridge arm that are staggered in parallel in the first conversion unit and the second conversion unit; and reduces the risk of over-temperature and over-current of the transistor by setting a voltage acquisition unit, a current acquisition unit and a temperature acquisition unit to respectively monitor the higher output voltage, input current and the temperature of each component. When overvoltage, overcurrent and overtemperature occur, a protection strategy that matches the situation can be formulated to ensure that the motor controller circuit is fully monitored and safety hazards are eliminated.

[0010] Optionally, determining a circuit protection strategy according to the output voltage, the input current or the circuit temperature includes:

[0011] When the input current is greater than or equal to the first overcurrent point and less than the second overcurrent point, and the accumulated duration exceeds the first preset duration, it is determined that the voltage conversion module is in an overcurrent state, and the current input of the voltage conversion module is interrupted;

[0012] When the number of effective overcurrent times exceeds the preset number, or the effective overcurrent duration exceeds the third preset duration, the voltage conversion module is determined to be in a short-circuit state and short-circuit protection is performed, wherein the effective overcurrent times include the number of times the input current is greater than or equal to the third overcurrent point and the single duration exceeds the second preset duration; the effective overcurrent duration includes the sum of the overcurrent durations of all the effective overcurrent times, and the current value corresponding to the third overcurrent point is greater than the current value corresponding to the second overcurrent point.

[0013] Optionally, determining a circuit protection strategy according to the output voltage, the input current or the circuit temperature further includes:

[0014] When the circuit temperature is greater than or equal to the first over-temperature point and less than the second over-temperature point, and the accumulated time exceeds a fourth preset time, it is determined that the voltage conversion module is in an over-temperature state, and the voltage conversion module is controlled to reduce the output.

[0015] Optionally, the first bridge arm includes a first transistor and a second transistor, the second bridge arm includes a third transistor and the fourth transistor, and the first bridge arm and the second bridge arm are connected in parallel in an alternating manner; after controlling the voltage conversion module to output at a reduced rating, the method further includes:

[0016] When the temperature of the circuit continues to rise, half of the transistors in the first bridge arm are controlled to be closed, half of the transistors in the second bridge arm are controlled to be closed, and the other half of the transistors in the first bridge arm are controlled to be opened, and the other half of the transistors in the second bridge arm are controlled to be opened.

[0017] Optionally, determining a circuit protection strategy according to the output voltage, the input current or the circuit temperature further includes:

[0018] When the circuit temperature is greater than or equal to the first over-temperature point, and the accumulated time exceeds the fourth preset time, and the input current is greater than or equal to the third over-current point, it is determined that the voltage conversion module is in a short-circuit state and short-circuit protection is performed.

[0019] Optionally, determining a circuit protection strategy according to the output voltage, the input current or the circuit temperature further includes:

[0020] When the output voltage is higher than the overvoltage threshold, determining a corresponding overcurrent point according to the output voltage, and determining the input current according to the current acquisition unit;

[0021] When the input current is greater than or equal to the corresponding overcurrent point and the accumulated duration exceeds a fifth preset duration, it is determined that the voltage conversion module is in an overvoltage state, and the voltage conversion module is controlled to output at a reduced rate.

[0022] Optionally, the mutual inductance between the first inductor and the second inductor is decoupled, so as to make the equivalent inductance between the first inductor and the second inductor equal to the inductance value of any one of the inductors.

[0023] Optionally, the output voltage includes a first output voltage and a second output voltage, the voltage conversion module also includes a first motor inverter circuit and a second motor inverter circuit, the first end of the first motor inverter circuit is electrically connected to the second end of the voltage conversion module, the second end of the first voltage inverter circuit is used to be electrically connected to the first motor, the first end of the second motor inverter circuit is electrically connected to the second end of the voltage conversion module, and the second end of the second motor inverter circuit is used to be electrically connected to the second motor;

[0024] The output end of the first motor inverter circuit includes a first output voltage sampling point, and the first output voltage sampling point is used for the detection protection module to collect the first output voltage;

[0025] The output end of the second motor inverter circuit includes a second output voltage sampling point, and the second output voltage sampling point is used for the detection and protection module to collect the second output voltage.

[0026] Optionally, the transistor temperature in the motor controller circuit includes at least one of the following temperatures:

[0027] The temperature of the transistors in the first bridge arm, the temperature of the transistors in the second bridge arm, the temperature of the transistors in the first motor inverter circuit, and the temperature of the transistors in the second motor inverter circuit.

[0028] In a second aspect, the present invention further provides a vehicle, comprising the motor controller circuit protection system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a system block diagram of a motor controller circuit protection system according to an embodiment of the present invention;

[0030] Figure 2 A detailed system block diagram of a motor controller circuit protection system according to an embodiment of the present invention;

[0031] Figure 3 A flow chart of a circuit protection strategy in a motor controller circuit protection system according to an embodiment of the present invention;

[0032] Figure 4 A flow chart of another circuit protection strategy in the motor controller circuit protection system according to an embodiment of the present invention;

[0033] Figure 5 A flow chart of another circuit protection strategy in the motor controller circuit protection system according to an embodiment of the present invention;

[0034] Figure 6 4 is a simplified circuit diagram of a voltage conversion module in a motor controller circuit protection system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0036] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0037] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". Relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0038] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0039] like Figure 1 and Figure 6 As shown, an embodiment of the present invention provides a motor controller circuit protection system, including a voltage conversion module and a detection protection module;

[0040] The first end of the voltage conversion module is used to be electrically connected to a battery, and the second end of the voltage conversion module is used to be electrically connected to a motor, wherein the voltage conversion module includes a first conversion unit and a second conversion unit that are staggered in parallel, the first conversion unit includes a first inductor and a first bridge arm, the second conversion unit includes a second inductor and a second bridge arm, the second end of the first inductor is electrically connected to the midpoint of the first bridge arm, the second end of the second inductor is electrically connected to the midpoint of the second bridge arm, the first end of the first inductor is connected to the first end of the second inductor to form the first end of the voltage conversion module, and the first bridge arm and the second bridge arm are connected in parallel to form the second end of the voltage conversion module.

[0041] Specifically, in an embodiment of the present invention, in order to avoid the loop voltage, current fluctuation and temperature rise caused by the boost change, the voltage conversion module in the motor controller circuit is improved to reduce the current and voltage pressure of the electronic device, specifically including setting at least two staggered parallel inductors L1 and L2 in the voltage conversion module. By allowing the two parallel inductors L1 and L2 to run staggered, relative to the single inductor boost loop, the two staggered parallel inductors in this embodiment can reduce or offset the ripple of the inductor current, which can effectively reduce the current and temperature rise, and also effectively reduce the volume. By also setting staggered parallel transistors in the voltage conversion module, the current on a single transistor can be reduced, and the staggered parallel connection can offset the ripple of the two-phase current after the boost, thereby reducing the volume and improving the heat dissipation performance. In the following embodiments, the transistor includes a first transistor Q1 and a second transistor Q2 of the first conversion unit, and a third transistor Q3 and a fourth transistor Q4 of the second conversion unit, wherein the first transistor Q1 and the second transistor Q2 form the upper and lower arms of an H bridge; the third transistor Q3 and the fourth transistor Q4 form the upper and lower arms of another H bridge. The first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 form two parallel boost circuits. The first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 work alternately, the first transistor Q1 and the third transistor Q3 will not be turned on at the same time, the second transistor Q2 and the fourth transistor Q4 will not be turned on at the same time, and the four transistors work alternately in pairs to reduce current ripple.

[0042] In one embodiment, the first conversion unit and the second conversion unit are connected in parallel and interlaced, that is, the first conversion unit and the second conversion unit are connected in parallel and interlaced, the first conversion unit includes a first inductor L1 and a first bridge arm, the first bridge arm is composed of a first transistor Q1 and a second transistor Q2, and is used to cooperate with the first inductor to increase or decrease voltage; the second conversion unit is connected in parallel with the first conversion unit, the second conversion unit includes a second inductor L2 and a second bridge arm, the second bridge arm is composed of a third transistor Q3 and a fourth transistor Q4, and the second conversion unit has the same structure as the first conversion unit, when the first inductor L1 stores energy, the second inductor L2 releases energy. When the battery discharges through the first end of the voltage conversion unit to drive the vehicle, the current flows in from the first end of the voltage conversion unit, and is boosted by the first conversion unit and / or the second conversion unit, and output to the second end of the voltage conversion module to drive the vehicle; when the vehicle generates electricity through the motor, or recovers kinetic energy, the current flows from the second end of the voltage conversion module to the first end, that is, the current is stepped down from the first conversion unit and / or the second conversion unit and output to the battery.

[0043] Optionally, the transistors connected in parallel are SiC transistors.

[0044] Among them, SiC tubes have higher control frequency and switching frequency, and are more temperature-resistant, which can ensure circuit safety and robustness during control.

[0045] In one embodiment, the voltage conversion module further includes a Boost / Buck circuit and an inverter circuit, wherein the Boost / Buck circuit is used to boost the voltage from the battery to the voltage required by the motor and convert it into AC power compatible with the motor through the inverter circuit. The Boost / Buck circuit is also used to reversely power the battery.

[0046] The detection and protection module includes a voltage acquisition unit, a current acquisition unit and a temperature acquisition unit. The voltage acquisition unit is used to acquire the output voltage after the voltage conversion module is boosted, the current acquisition unit is used to acquire the input current of the voltage conversion module before the voltage is boosted, and the temperature acquisition module is used to acquire the circuit temperature, and the circuit temperature includes the inductor temperature of the inductor in the voltage conversion module and / or the transistor temperature in the motor controller circuit.

[0047] The detection protection module can output a preset circuit protection strategy according to at least one of the output voltage, the input current or the circuit temperature.

[0048] In one embodiment, a detection protection module is provided, and multiple voltage, current, and temperature collection points are provided in the circuit to collect the voltage, current, and temperature of each component, thereby ensuring accurate monitoring and protection of the Boost / Buck circuit. Since the input voltage is usually lower than the output voltage, when the output voltage after being boosted by the voltage conversion module exceeds a preset value, the detection protection module triggers voltage protection; since the output current after boosting is usually lower than the input current, the input current is monitored for protection. When the input current exceeds the preset value, the detection protection module determines the current state according to the current value, and outputs a preset current protection strategy accordingly; since the inductor and transistor in the circuit are both subjected to a large voltage, when the voltage fluctuates and causes the Boost / Buck loop voltage, the inductor and transistor may have a problem of temperature rise. By detecting the inductor temperature and the transistor temperature, a more comprehensive temperature monitoring result is ensured, and a matching temperature protection strategy is determined according to the temperature values ​​of different components in the circuit.

[0049] Alternatively, if Figure 3 As shown, the circuit protection strategy preset according to the output voltage, the input current or the circuit temperature output includes:

[0050] When the input current is greater than or equal to the first overcurrent point and less than the second overcurrent point, and the accumulated duration exceeds the first preset duration, it is determined that the voltage conversion module is in an overcurrent state, and the current input of the voltage conversion module is interrupted;

[0051] When the number of effective overcurrent times exceeds the preset number, or the effective overcurrent duration exceeds the third preset duration, the voltage conversion module is determined to be in a short-circuit state and short-circuit protection is performed, wherein the effective overcurrent times include the number of times the input current is greater than or equal to the third overcurrent point and the single duration exceeds the second preset duration; the effective overcurrent duration includes the sum of the overcurrent durations of all the effective overcurrent times, and the current value corresponding to the third overcurrent point is greater than the current value corresponding to the second overcurrent point.

[0052] In one embodiment, multiple overcurrent points are set to determine what kind of overcurrent state is currently in, and a current protection strategy suitable for the current overcurrent state is determined according to different current values. For example, when the maximum current allowed by the bus is I, the single-phase current of the Boost / Buck circuit is I / 2. In the actual circuit, considering the existence of current ripple, the first overcurrent point of the single-phase circuit needs to be added with a first weight as the first overcurrent point. Specifically, if the maximum current allowed by the bus is 340A, the single-phase current is 170A. Considering the current ripple, the first weight is set to 1.25, and the first overcurrent point is set to 210A. When the input current does not exceed 210A, the motor controller controls the full-function output of the battery, and the Boost state is set to the bit0 Fullperformance state.

[0053] In another embodiment, taking into account the error in hardware current detection or for setting a buffer zone when no serious consequences are formed, a second overcurrent point is further set above the first overcurrent point to form an overcurrent interval for judging hardware overcurrent, and when the input current is in the overcurrent interval, the hardware is controlled for passive cooling. For example, a second weight is set for the first overcurrent point as a judgment weight for hardware overcurrent. Specifically, the second weight can be set to 1.2. When the first overcurrent point is 210A, the second overcurrent point is 250A, and a first preset time is set to reduce misjudgment. For example, if the first preset time is set to 100ms, when the input current is between 210A-250A and lasts for more than 100ms, the hardware is judged to be overcurrent, indicating that a boost loop may appear, resulting in an abnormal increase in current. The current output in the controller circuit is interrupted to eliminate the fault. At this time, the Boost state is set to the bit2 Powerloss state. At this time, the vehicle power system needs to be restored to work by powering on and off again.

[0054] Optionally, the first weight ranges from 1.2 to 1.3, and the second weight ranges from 1.1 to 1.4.

[0055] The first weight and the second weight can be set according to specific hardware and requirements.

[0056] In another embodiment, in response to a high-voltage short-circuit loop situation, the current will rise instantly, causing the boost loop to burn out, and whether a short-circuit situation occurs is determined by setting the number of valid overcurrent times or the valid overcurrent duration.

[0057] Specifically, since the current will increase abnormally during a short circuit, the determination condition for the effective overcurrent times includes that the input current is greater than or equal to the third overcurrent point, wherein the third overcurrent point is greater than the second overcurrent point. In order to avoid misjudgment caused by inaccurate current measurement, the second preset time length is set as the second determination condition for the effective overcurrent times. For example, the third overcurrent point is set to 280A, and the second preset time length is set to 10ms, which means that each time the current exceeds 280A and the duration exceeds 10ms, it is recorded as the effective overcurrent times in sequence. When the preset number is set to 100 times, when the effective overcurrent times are greater than or equal to 100 times, it is determined to be a short circuit state, and short circuit protection is executed. At this time, the Boost state is set to bit3Emergency or Shortcircle. Send a signal to ECM, ECM determines the short circuit situation and forwards the disconnect relay request, sends the request to BECM for execution, and performs the throw.

[0058] On the other hand, in some special cases, it is not accurate to judge whether the circuit is short-circuited by the number of times, and whether it is short-circuited is determined by the accumulated effective overcurrent duration. For example, if the third preset duration is set to 1s and the preset number of times is set to 100 times, then in a driving cycle (one power on and off), even if the effective overcurrent times are 3 times, but each time lasts 0.4 seconds, which adds up to 1.2 seconds, which is greater than 1 second, it is determined to be a short-circuit state and short-circuit protection is executed.

[0059] like Figure 3 As shown, when the input current is less than the first overcurrent point, the motor controller controls the battery to output full performance, and the Boost state is set to bit0 Full performance state.

[0060] Alternatively, if Figure 4 As shown, the determining of the circuit protection strategy according to the output voltage, the input current or the circuit temperature further includes:

[0061] When the circuit temperature is greater than or equal to the first over-temperature point and less than the second over-temperature point, and the accumulated time exceeds a fourth preset time, it is determined that the voltage conversion module is in an over-temperature state, and the voltage conversion module is controlled to reduce the output.

[0062] In one embodiment, when any one or more of the inductor temperature and the transistor temperature in the circuit temperature is greater than or equal to the first over-temperature point and less than the second over-temperature point, and the duration exceeds a fourth preset duration, it indicates that the controller circuit is in an over-temperature state, and the circuit temperature is reduced by derating the output to ensure safety.

[0063] In another embodiment, the first over-temperature point is determined by the junction temperature of the transistor. For example, when the transistor is a SiC tube, its junction temperature is 175°C. Considering the temperature transfer speed, detection accuracy and monitoring point setting, the first over-temperature point is set to 135°C. Considering the floating range of the over-temperature point, the second over-temperature point is set to form an over-temperature interval together with the first over-temperature point to trigger over-temperature protection within the over-temperature interval. For example, the second over-temperature point is set to 140°C, that is, when the circuit temperature exceeds 135°C and is less than 140°C, the over-temperature protection is triggered. At this time, the Boost state is set to bit1 Derating Level, and the power is controlled to be reduced by 70% to reduce the power of the transistor or inductor, thereby reducing the heating temperature.

[0064] Alternatively, if Figure 6 As shown, the first bridge arm includes a first transistor Q1 and a second transistor Q2, the second bridge arm includes a third transistor Q3 and the fourth transistor Q4, and the first bridge arm and the second bridge arm are staggered in parallel; after controlling the voltage conversion module to derate the output, it also includes:

[0065] When the temperature of the circuit continues to rise, half of the transistors in the first bridge arm are controlled to be closed, half of the transistors in the second bridge arm are controlled to be closed, and the other half of the transistors in the first bridge arm are controlled to be opened, and the other half of the transistors in the second bridge arm are controlled to be opened.

[0066] Specifically, staggered parallel connection means that the two transistors Q1 and Q2 in the first bridge arm and the two transistors Q3 and Q4 in the second bridge arm work alternately and are connected in parallel. The first transistor Q1 and the third transistor Q3 will not be turned on at the same time, and the second transistor Q2 and the fourth transistor Q4 will not be turned on at the same time. Figure 6 As shown, when the first transistor Q1 and the fourth transistor Q4 are turned on, the current stores energy through the upper half of the first inductor L1 and the second inductor L2, and the current begins to flow through the two inductors. Subsequently, the first transistor Q1 and the fourth transistor Q4 are turned off, and the second transistor Q2 and the third transistor Q3 are turned on. At this time, the current path of the lower half of the first inductor L1 and the second inductor L2 is established, and the energy previously stored in the inductor is released to the load side, while continuing to obtain energy from the input power supply, achieving continuous current flow and voltage boost.

[0067] In one embodiment, since temperature is different from current and voltage, the change in temperature needs to be determined by observation over time. After the sixth preset time period, the circuit temperature is re-determined. When the circuit temperature continues to rise after derating, the transistors in the circuit are controlled to operate in a preset state. For example, the first transistor and the third transistor are closed to operate as conductors. At this time, the transistors only have conduction losses but no switching losses. At the same time, the second transistor and the fourth transistor are disconnected to stop working. The current only passes through the first transistor and the third transistor, thereby reducing the temperature in the boost / buck circuit and thus reducing the temperature of the overall voltage conversion module.

[0068] Alternatively, if Figure 4 As shown, the preset circuit protection strategy output according to the output voltage, the input current or the circuit temperature also includes:

[0069] When the circuit temperature is greater than or equal to the first over-temperature point, and the accumulated time exceeds the fourth preset time, and the input current is greater than or equal to the third over-current point, it is determined that the voltage conversion module is in a short-circuit state and short-circuit protection is performed.

[0070] When the circuit temperature is greater than or equal to the first over-temperature point, and the accumulated duration exceeds the fourth preset duration, it indicates that the circuit temperature may have been in an over-temperature state, and in order to avoid further higher temperatures due to short circuit, the input current is judged at the same time. When the input current is greater than or equal to the third over-current point, the controller circuit is judged to be short-circuited, and short-circuit protection is executed. At this time, the Boost state is set to bit3 Emergency or Short circle. Send a signal to the ECM, the ECM judges the short-circuit situation and forwards the disconnect relay request, sends the request to the BECM for execution, and performs the throw.

[0071] Optionally, the fourth preset time length is 100 ms.

[0072] Alternatively, if Figure 5 As shown, the determining of the circuit protection strategy according to the output voltage, the input current or the circuit temperature further includes:

[0073] When the output voltage is higher than the overvoltage threshold, determining a corresponding overcurrent point according to the output voltage, and determining the input current according to the current acquisition unit;

[0074] When the input current is greater than or equal to the corresponding overcurrent point and the accumulated duration exceeds a fifth preset duration, it is determined that the voltage conversion module is in an overvoltage state, and the voltage conversion module is controlled to output at a reduced rate.

[0075] In one embodiment, the overvoltage threshold is determined by the inductor and transistor in the circuit. When the output voltage exceeds the overvoltage threshold, the corresponding overcurrent point is determined according to the output voltage to determine whether the input current exceeds the corresponding overcurrent point. For example, the overvoltage threshold is set to 540V, and the corresponding overcurrent point is determined according to the overvoltage threshold. When the input current exceeds the corresponding overcurrent point and the duration exceeds the fifth preset duration, it is determined that the controller circuit is in an overvoltage state. At this time, the Boost state is set to bit1 Derating Level, and the control power is reduced by 70%.

[0076] Optionally, the mutual inductance between the first inductor and the second inductor is decoupled, so as to make the equivalent inductance between the first inductor and the second inductor equal to the inductance value of any one of the inductors.

[0077] Inductors are arranged in parallel and staggered, and the inductor currents differ by 180 degrees. At this time, the mutual inductors should be reversely coupled; this can reduce the ripple of the inductor current; using magnetic integrated inductor mutual inductance decoupling, its equivalent inductance should be equal to the inductance value of the independent inductor solution, that is, the coupling relationship only exists in the magnetic circuit and has no effect on the circuit and control; this design helps to reduce the size of the inductor and improve the power density of the converter. At the same time, reverse coupling enhances the bias current capability.

[0078] Alternatively, if Figure 2 As shown, the output voltage includes a first output voltage and a second output voltage, the voltage conversion module also includes a first motor inverter circuit and a second motor inverter circuit, the first end of the first motor inverter circuit is electrically connected to the second end of the voltage conversion module, the second end of the first voltage inverter circuit is used to be electrically connected to the first motor, the first end of the second motor inverter circuit is electrically connected to the second end of the voltage conversion module, and the second end of the second motor inverter circuit is used to be electrically connected to the second motor;

[0079] The output end of the first motor inverter circuit includes a first output voltage sampling point, and the first output voltage sampling point is used for the detection protection module to collect the first output voltage;

[0080] The output end of the second motor inverter circuit includes a second output voltage sampling point, and the second output voltage sampling point is used for the detection and protection module to collect the second output voltage.

[0081] Optionally, the transistor temperature in the motor controller circuit includes at least one of the following temperatures:

[0082] The temperature of the transistors in the first bridge arm, the temperature of the transistors in the second bridge arm, the temperature of the transistors in the first motor inverter circuit, and the temperature of the transistors in the second motor inverter circuit.

[0083] In one embodiment, the first motor inverter circuit and the second motor inverter circuit respectively include transistors for converting direct current into alternating current. For example, the first motor inverter circuit and the second motor inverter circuit are formed by a plurality of IGBT tubes, and a temperature monitoring point is also provided on the IGBT tube for monitoring the temperature of each IGBT tube. Since the junction temperature of the IGBT tube and the SiC tube is different, when the transistor is an IGBT tube, the first over-temperature point and the second over-temperature point are set according to the junction temperature of the IGBT tube.

[0084] In one embodiment, the monitoring point of the output voltage is set at the output end of the first motor inverter circuit and the second motor inverter circuit, for example, at both ends of the first motor and the second motor, for detecting the voltage output to the first motor and the second motor. The monitoring point of the input current is set on the battery bus, for detecting the current input from the battery bus to the voltage conversion module.

[0085] Yet another embodiment of the present invention provides a vehicle, comprising an electronic device, wherein the electronic device comprises the motor controller circuit protection system as described above.

[0086] The vehicle includes a memory and a processor; the memory is used to store a computer program; the processor is used to implement the circuit protection strategy described above when executing the computer program.

[0087] Yet another embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the circuit protection strategy described above is implemented.

[0088] An electronic device that can be used as a server or client of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. Electronic devices are intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic devices can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0089] The electronic device includes a computing unit, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) or a computer program loaded from a storage unit into a random access memory (RAM). In the RAM, various programs and data required for the operation of the device can also be stored. The computing unit, ROM and RAM are connected to each other through a bus. An input / output (I / O) interface is also connected to the bus.

[0090] A computer system may include clients and servers. Clients and servers are generally remote from each other and typically interact through a communication network. The relationship of client and server arises through computer programs running on the respective computers and having a client-server relationship to each other.

[0091] A person of ordinary skill in the art can understand that the implementation of all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc. In the present application, the unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, which may be located in one place or distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present invention. In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0092] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A motor controller circuit protection system, characterized in that: It includes a voltage conversion module and a detection and protection module; The first end of the voltage conversion module is used to be electrically connected to a battery, and the second end of the voltage conversion module is used to be electrically connected to a motor, wherein the voltage conversion module includes a first conversion unit and a second conversion unit that are staggered in parallel, the first conversion unit includes a first inductor and a first bridge arm, the second conversion unit includes a second inductor and a second bridge arm, the second end of the first inductor is electrically connected to the midpoint of the first bridge arm, the second end of the second inductor is electrically connected to the midpoint of the second bridge arm, the first end of the first inductor is connected to the first end of the second inductor to form the first end of the voltage conversion module, and the first bridge arm and the second bridge arm are connected in parallel to form the second end of the voltage conversion module; The detection protection module includes a voltage acquisition unit, a current acquisition unit and a temperature acquisition unit, wherein the voltage acquisition unit is used to acquire the output voltage after the voltage conversion module is boosted, the current acquisition unit is used to acquire the input current of the voltage conversion module before the voltage is boosted, and the temperature acquisition module is used to acquire the circuit temperature, wherein the circuit temperature includes the inductor temperature of the inductor in the voltage conversion module and / or the transistor temperature in the motor controller circuit; The detection protection module is used to output a preset circuit protection strategy according to at least one of the output voltage, the input current or the circuit temperature.

2. The motor controller circuit protection system according to claim 1, characterized in that: Determining a circuit protection strategy according to the output voltage, the input current or the circuit temperature comprises: When the input current is greater than or equal to the first overcurrent point and less than the second overcurrent point, and the accumulated duration exceeds the first preset duration, it is determined that the voltage conversion module is in an overcurrent state, and the current input of the voltage conversion module is interrupted; When the number of effective overcurrent times exceeds the preset number, or the effective overcurrent duration exceeds the third preset duration, the voltage conversion module is determined to be in a short-circuit state and short-circuit protection is performed, wherein the effective overcurrent times include the number of times the input current is greater than or equal to the third overcurrent point and the single duration exceeds the second preset duration; the effective overcurrent duration includes the sum of the overcurrent durations of all the effective overcurrent times, and the current value corresponding to the third overcurrent point is greater than the current value corresponding to the second overcurrent point.

3. The motor controller circuit protection system according to claim 1, characterized in that: The determining of the circuit protection strategy according to the output voltage, the input current or the circuit temperature further comprises: When the circuit temperature is greater than or equal to the first over-temperature point and less than the second over-temperature point, and the accumulated time exceeds a fourth preset time, it is determined that the voltage conversion module is in an over-temperature state, and the voltage conversion module is controlled to reduce the output.

4. The motor controller circuit protection system according to claim 3, characterized in that: The first bridge arm includes a first transistor and a second transistor, the second bridge arm includes a third transistor and the fourth transistor, and the first bridge arm and the second bridge arm are alternately connected in parallel; After controlling the voltage conversion module to output at a reduced rating, the method further includes: When the temperature of the circuit continues to rise, half of the transistors in the first bridge arm are controlled to be closed, half of the transistors in the second bridge arm are controlled to be closed, and the other half of the transistors in the first bridge arm are controlled to be opened, and the other half of the transistors in the second bridge arm are controlled to be opened.

5. The motor controller circuit protection system according to claim 3, characterized in that: The determining of the circuit protection strategy according to the output voltage, the input current or the circuit temperature further comprises: When the circuit temperature is greater than or equal to the first over-temperature point, and the accumulated time exceeds the fourth preset time, and the input current is greater than or equal to the third over-current point, it is determined that the voltage conversion module is in a short-circuit state and short-circuit protection is performed.

6. The motor controller circuit protection system according to claim 1, characterized in that: The determining of the circuit protection strategy according to the output voltage, the input current or the circuit temperature further comprises: When the output voltage is higher than the overvoltage threshold, determining a corresponding overcurrent point according to the output voltage, and determining the input current according to the current acquisition unit; When the input current is greater than or equal to the corresponding overcurrent point and the accumulated duration exceeds a fifth preset duration, it is determined that the voltage conversion module is in an overvoltage state, and the voltage conversion module is controlled to output at a reduced rate.

7. The motor controller circuit protection system according to claim 1, characterized in that: The mutual inductance decoupling between the first inductor and the second inductor is used to make the equivalent inductance between the first inductor and the second inductor equal to the inductance value of any one of the inductors.

8. The motor controller circuit protection system according to claim 1, characterized in that: The output voltage includes a first output voltage and a second output voltage, the voltage conversion module also includes a first motor inverter circuit and a second motor inverter circuit, the first end of the first motor inverter circuit is electrically connected to the second end of the voltage conversion module, the second end of the first voltage inverter circuit is used to be electrically connected to the first motor, the first end of the second motor inverter circuit is electrically connected to the second end of the voltage conversion module, and the second end of the second motor inverter circuit is used to be electrically connected to the second motor; The output end of the first motor inverter circuit includes a first output voltage sampling point, and the first output voltage sampling point is used for the detection protection module to collect the first output voltage; The output end of the second motor inverter circuit includes a second output voltage sampling point, and the second output voltage sampling point is used for the detection and protection module to collect the second output voltage.

9. The motor controller circuit protection system according to claim 8, characterized in that: The transistor temperature in the motor controller circuit includes at least one of the following temperatures: The temperature of the transistors in the first bridge arm, the temperature of the transistors in the second bridge arm, the temperature of the transistors in the first motor inverter circuit, and the temperature of the transistors in the second motor inverter circuit.

10. A vehicle, characterized in that: It comprises a motor controller circuit protection system as described in any one of claims 1-9.

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