Over-current protection circuit, over-current protection circuit board and electric equipment

Abstract

The utility model discloses an overcurrent protection circuit, an overcurrent protection circuit board and electric equipment, and relates to the technical field of power electronics. The overcurrent protection circuit is applied to the motor controller, and the power input end of the motor controller is used for being electrically connected with a battery pack and outputting motor driving current. The over-current protection circuit comprises an over-current protection module, the input end of the over-current protection module is electrically connected with the output end of the motor controller, and the output end of the over-current protection module is used for being electrically connected with the input end of the driving motor; the signal input end of the detection module is electrically connected with the detection signal output end of the overcurrent protection module, the first signal output end of the detection module is electrically connected with the signal feedback end of the motor controller, and the second signal output end of the detection module is electrically connected with the control end of the overcurrent protection module. According to the embodiment of the invention, the overcurrent problem under the condition that the overcurrent protection of the motor controller fails can be effectively solved, so that the working stability and safety of equipment can be fully improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the electric power electronics technical field especially, it relates to a kind of overcurrent protection circuit, overcurrent protection circuit board and electrical equipment. BACKGROUND

[0002] Generally in electric power electronics technical field, driving motor plays a core role in various applications, which is usually provided with motor driving current by corresponding motor controller to provide power and control for various mechanical equipment. In order to guarantee the safe operation of driving motor in electrical equipment, overcurrent detection is often needed for motor driving current provided to driving motor to avoid current too large to burn electric motor, thereby causing economic loss and affecting equipment working stability, and even causing huge safety hazard to personnel in serious case.

[0003] Taking driving motor in automobile as an example, in the case of high-power, large-current motor in automobile, the detection of motor driving current currently mainly relies on the realization of Hall current sensor integrated in motor controller, and Hall current sensor can assist motor controller to perform overcurrent detection, so the reliability of Hall current sensor is of great significance for timely and effective overcurrent detection of motor driving current. However, due to the problems such as harsh operating conditions of commercial vehicles, Hall current sensor is extremely easy to fail in the case of high vibration and strong interference. In the case of Hall current sensor failure, overcurrent fault occurs, which may cause shutdown, and even burn electric motor, thereby easily causing huge safety hazard to equipment and operators, and further affecting equipment working stability and causing economic loss.

[0004] In view of the above, how to effectively solve the safety hazard caused by overcurrent protection failure of motor controller itself to fully improve the working stability of electrical equipment and the safety of operators is a problem to be solved in the industry at present. UTILITY MODEL CONTENTS

[0005] The application embodiment provides an overcurrent protection circuit, an overcurrent protection circuit board and an electrical equipment, which can effectively solve the overcurrent problem in the case of overcurrent protection failure of motor controller itself, thereby fully improving the working stability and safety of equipment.

[0006] In the first aspect, the application embodiment provides an overcurrent protection circuit, which is applied to a motor controller. A power input end of the motor controller is electrically connected with a battery pack. Under the power supply of the battery pack, an output end of the motor controller outputs motor driving current. The overcurrent protection circuit comprises:

[0007] The overcurrent protection module has an input end electrically connected to an output end of the motor controller, and an output end for electrically connecting to an input end of the driving motor;

[0008] The detection module has a signal input end electrically connected to a detection signal output end of the overcurrent protection module, a first signal output end electrically connected to a signal feedback end of the motor controller, and a second signal output end electrically connected to a control end of the overcurrent protection module.

[0009] The overcurrent protection module is configured to transmit a detection signal to the detection signal output end of the detection module according to the motor driving current; the detection module is configured to transmit a first protection signal to the signal feedback end of the motor controller according to the motor driving current, so as to make the motor controller stop outputting the motor driving current, and / or transmit a second protection signal to the control end of the overcurrent protection module, so as to disconnect the overcurrent protection module, thereby protecting the driving motor.

[0010] In some possible embodiments, the overcurrent protection module includes a detection signal sampling sub-module and a switch protection sub-module arranged in series;

[0011] The detection signal sampling sub-module has an input end electrically connected to an output end of the motor controller, and an output end electrically connected to an input end of the switch protection sub-module; the switch protection sub-module has an output end electrically connected to an input end of the driving motor.

[0012] Alternatively, the switch protection sub-module has an input end electrically connected to an output end of the motor controller, and an output end electrically connected to an input end of the detection signal sampling sub-module; the detection signal sampling sub-module has an output end electrically connected to an input end of the driving motor.

[0013] The detection signal sampling sub-module has a detection signal output end electrically connected to a signal input end of the detection module, and configured to output a detection signal according to the motor driving current.

[0014] The switch protection sub-module has a control end electrically connected to a second signal output end of the detection module, and configured to be turned off under control of the second protection signal.

[0015] In some possible embodiments, the detection signal sampling sub-module includes a sampling resistor, and the detection signal is a voltage signal sampled based on the sampling resistor.

[0016] The switch protection sub-module includes a fuse or a switch tube, and the fuse or the switch tube is configured to be turned off under control of the second protection signal.

[0017] In some possible embodiments, the detection module includes:

[0018] The signal comparison submodule is configured to compare the detection signal with a preset reference signal to determine whether the detection signal indicates that the motor driving current reaches the overcurrent protection point;

[0019] The overcurrent timing submodule is configured to time a duration of overcurrent of the motor driving current to obtain an overcurrent duration of the motor driving current.

[0020] The signal generation submodule is configured to generate a first protection signal and transmit the first protection signal to a signal feedback end of the motor controller when the detection signal indicates that the motor driving current reaches the overcurrent protection point.

[0021] In addition, the signal generation submodule is further configured to generate a second protection signal and transmit the second protection signal to a control end of the overcurrent protection module when the overcurrent duration of the motor driving current exceeds a preset duration.

[0022] In some possible implementation manners, the detection module is a microcontroller unit.

[0023] The microcontroller unit is configured to transmit the first protection signal to the signal feedback end of the motor controller when the detection signal indicates that the motor driving current reaches the overcurrent protection point.

[0024] The microcontroller unit is further configured to receive an updated detection signal transmitted by the overcurrent protection module after a preset duration when the motor driving current reaches the overcurrent protection point is first detected, and transmit the second protection signal to the control end of the overcurrent protection module when the updated detection signal indicates that the motor driving current still reaches the overcurrent protection point.

[0025] In a second aspect, an embodiment of the present application provides an overcurrent protection circuit board, which comprises the overcurrent protection circuit and the motor controller provided in any of the above embodiments of the present application.

[0026] The overcurrent protection circuit board is configured to be arranged between the battery pack and an input end of the driving motor.

[0027] In some possible implementation manners, the motor controller comprises a control module and a driving module.

[0028] The control signal output end of the control module is electrically connected to the control signal receiving end of the driving module, and the control module is configured to output a switching control signal to the control signal receiving end of the driving module according to an expected working parameter of the driving motor.

[0029] The power input end of the driving module is electrically connected to the battery pack, and the output end of the driving module is electrically connected to the input end of the driving motor. The driving module is configured to output a motor driving signal to the input end of the driving motor according to the switching control signal, so as to drive the driving motor to work according to the expected working parameter.

[0030] In some possible implementation manners, the motor controller further includes a Hall current sensor module and a hardware overcurrent detection module;

[0031] An input end of the Hall current sensor module is electrically connected with an output end of the driving module, an output end of the Hall current sensor module is electrically connected with an input end of the hardware overcurrent detection module, and an output end of the hardware overcurrent detection module is electrically connected with a signal feedback end of the control module;

[0032] The Hall current sensor module is configured to convert the motor driving current into a corresponding voltage sensing signal and transmit the voltage sensing signal to the hardware overcurrent detection module;

[0033] The hardware overcurrent detection module is configured to transmit a first level voltage or a second level voltage to the control module according to a size of the voltage sensing signal, the first level voltage indicating that the motor driving current is overcurrent, and the second level voltage indicating that the motor driving current is not overcurrent.

[0034] In some possible implementation manners, the driving module includes a three-phase inverter bridge, and an outgoing line end of the three-phase inverter bridge is electrically connected with an input end of the driving motor;

[0035] The three-phase inverter bridge is composed of six power switching tubes, configured to convert a direct-current voltage provided by the battery pack into a three-phase alternating-current voltage, so as to output the motor driving current to the input end of the driving motor, the motor driving current being a three-phase alternating-current.

[0036] In a third aspect, an embodiment of the present application provides a power consumption device, including: a battery pack, a motor controller, an overcurrent protection circuit provided in any of the above embodiments of the present application, and a driving motor.

[0037] Alternatively, the power consumption device includes: a battery pack, an overcurrent protection circuit board provided in any of the above embodiments of the present application, and a driving motor.

[0038] As described above, the overcurrent protection circuit, the overcurrent protection circuit board and the power consumption device provided in the embodiments of the present application, the overcurrent protection circuit is applied to a motor controller outputting a motor driving current to a driving motor, the overcurrent protection circuit is provided with an overcurrent protection module and a detection module, the overcurrent protection module can sample the motor driving current output from the output end of the motor controller and transmit the motor driving current to the detection module, the detection module can transmit a first protection signal to the motor controller according to the overcurrent condition of the sampled motor driving current, so as to make the motor controller stop outputting the motor driving current, and / or output a second protection signal to the overcurrent protection module, so as to cut off the transmission channel of the motor driving current to the driving motor, thereby fully and reliably achieving double overcurrent protection of the driving motor from two aspects.

[0039] Compared with the prior art, the overcurrent protection circuit, the overcurrent protection circuit board and the electrical equipment provided by the embodiments of the present application are determined by the motor drive current output by the motor controller, so that the overcurrent protection of the rear motor end can be quickly and reliably realized even without the motor controller when the overcurrent protection of the motor controller fails or even the motor controller fails, and the reliability reduction problem of the module Hall in the motor controller can also be assisted in troubleshooting. Therefore, the overcurrent protection circuit, the overcurrent protection circuit board and the electrical equipment of the embodiments of the present application can effectively solve the overcurrent problem in the case of overcurrent protection failure of the motor controller itself, thereby fully improving the stability and safety of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0041] Figure 1 Fig. 1 shows a structure schematic diagram of a vehicle motor control architecture provided by an embodiment of the present application;

[0042] Figure 2 Fig. 2 is a structure schematic diagram of an overcurrent protection circuit provided by an embodiment of the present application;

[0043] Figure 3 Fig. 3 is a structure schematic diagram of an overcurrent protection circuit provided by another embodiment of the present application;

[0044] Figure 4 Fig. 4 is a structure schematic diagram of an overcurrent protection circuit board provided by an embodiment of the present application;

[0045] Figure 5 Fig. 5 is a structure schematic diagram of an overcurrent protection circuit board provided by another embodiment of the present application;

[0046] Figure 6 Fig. 6 is a structure schematic diagram of an electrical equipment provided by an embodiment of the present application. DETAILED DESCRIPTION

[0047] The features and exemplary embodiments of various aspects of the present application will be described in detail below, in order to make the purposes, technical solutions and advantages of the present application more clear and apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. The present application can be implemented without some of these specific details by those skilled in the art. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0048] It should be noted that the relative terms, such as first and second, and the like are used herein only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by an "includes" statement does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0049] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The embodiments will be described in detail below with reference to the accompanying drawings.

[0050] As described in the background section, taking the whole vehicle motor control as an example, the reliability of the Hall sensor in the motor controller in the automobile is of great significance for timely and effective implementation of overcurrent detection of motor driving current. Specifically, please refer to Figure 1 , Figure 1 The structure of the whole vehicle motor control architecture provided by an embodiment of the present application is shown. As shown in Figure 1 , the whole vehicle motor control includes a battery pack, an electric control end and a motor end. The electric control end corresponds to the aforementioned motor controller, and the electric control end usually integrates elements such as Hall current sensors for overcurrent protection. In specific work, the battery pack supplies power to the electric control end, and the electric control end outputs motor driving current to the motor end. The current output by the electric control end can be detected by the Hall sensor in the electric control end. If the current detection is normal, the system runs normally. When an overcurrent fault is detected, appropriate overcurrent handling measures will be taken.

[0051] However, the reliability of the Hall sensor in the electric control end is reduced or fails frequently at present, and in severe cases, the control function of the entire electric control end fails, so that the electric control end cannot effectively play the overcurrent protection of the rear motor end. When the actual output motor driving current of the electric control end exceeds the range that the motor and other related devices can withstand, it may cause shutdown or even burn the electric control motor, thereby affecting the stability of the equipment and causing economic losses.

[0052] In order to solve the above technical problems, the embodiments of the present application provide an overcurrent protection circuit, an overcurrent protection circuit board and an electric device, to effectively solve the safety hidden danger caused by the overcurrent protection failure of the motor controller itself. First, the overcurrent protection circuit provided by the embodiments of the present application will be introduced.

[0053] Figure 2 is a structural schematic diagram of an overcurrent protection circuit 100 provided by an embodiment of the present application.

[0054] As shown in Figure 2 , the present application provides an overcurrent protection circuit 100, which is applied to a motor controller 200. A power input end of the motor controller 200 is used for electrical connection with a battery pack 300. Under the power supply of the battery pack 300, an output end of the motor controller 200 outputs a motor driving current. The battery pack 300 specifically provides a direct current voltage to the motor controller 200.

[0055] As shown in Figure 2 , the overcurrent protection circuit 100 of the present application embodiment includes:

[0056] An overcurrent protection module 20, an input end of the overcurrent protection module 20 is electrically connected with an output end of the motor controller 200, and an output end of the overcurrent protection module 20 is used for electrical connection with an input end of a driving motor 400.

[0057] A detection module 10, a signal input end of the detection module 10 is electrically connected with a detection signal output end of the overcurrent protection module 20, a first signal output end of the detection module 10 is electrically connected with a signal feedback end of the motor controller 200, and a second signal output end of the detection module 10 is electrically connected with a control end of the overcurrent protection module 20.

[0058] The overcurrent protection module 20 is used for transmitting a detection signal to the detection signal output end of the detection module 10 according to the motor driving current. Specifically, the overcurrent protection module is used for signal sampling of the motor driving current, and the current signal of the motor driving current is converted into a voltage signal and transmitted to the detection module as the detection signal.

[0059] It should be noted that, in addition to converting the current signal of the motor driving current into a voltage signal, the overcurrent protection module 20 can also amplify, denoise, and perform other processing operations on the converted voltage signal, which is not strictly limited by the present application.

[0060] The detection module 10 is used for transmitting a first protection signal to the signal feedback end of the motor controller 200 according to the motor driving current, so as to make the motor controller 200 stop outputting the motor driving current.

[0061] And / or, the detection module 10 can also be used for transmitting a second protection signal to the control end of the overcurrent protection module 20 according to the motor driving current, so as to disconnect the overcurrent protection module 20.

[0062] In the embodiment, the detection module 10 can transmit the first protection signal and / or the second protection signal according to the overcurrent degree of the motor driving current, the overcurrent duration, the actual bearable current range of the driving motor 400, and the like.

[0063] In the embodiment, the detection module 10 can transmit the first protection signal and / or the second protection signal according to the overcurrent degree of the motor driving current, the overcurrent duration, the actual bearable current range of the driving motor 400, and the like.

[0064] For example, when the detection module 10 determines that the motor driving current output by the motor controller 200 is overcurrent, the detection module 10 preferentially transmits the first protection signal to the motor controller 200 at the front end, so that the motor controller 200 stops outputting the motor driving current in response to the first protection signal, thereby safely and stably achieving the shutdown protection of the driving motor 400 under the overcurrent condition.

[0065] Further, in actual operation, the motor controller 200 may actually fail due to unexpected situations such as large interference and high vibration, i.e., the motor controller 200 may not normally respond to the first protection signal to stop outputting the motor driving signal.

[0066] Therefore, in order to provide higher safety level overcurrent protection for the driving motor 400, in the embodiment, the detection module 10 can output the second protection signal to the overcurrent protection module 20 to disconnect the overcurrent protection module 20 to protect the driving motor 400 when the motor controller 200 continuously outputs overcurrent motor driving current for a period of time and the motor controller 200 still does not stop outputting the motor driving current.

[0067] In the case where the overcurrent protection module 20 is disconnected, the loop between the motor controller 200 and the driving motor 400 is cut off, so that even if the motor controller 200 still outputs overcurrent, the driving motor 400 will not be damaged. In this way, double reliable overcurrent protection for the driving motor is achieved.

[0068] In some other possible embodiments, the first protection signal or the second protection signal can also be selected according to the overcurrent degree (i.e. the current size) of the motor driving current in the above manner. For example, if the motor driving current is far beyond the maximum tolerance current of the driving motor 400, it indicates that a large current is generated and emergency overcurrent protection is needed. Since the first protection signal needs a certain period of time to take effect, the second protection signal can be transmitted to the overcurrent protection module 20 in priority to cut off the transmission path of the current to the driving motor 400 as soon as possible. If the motor driving current is slightly beyond the maximum tolerance current of the driving motor 400, the overcurrent protection module 20 can be selected to transmit the first protection signal to the motor controller 200.

[0069] It should be noted that in the actual overcurrent protection scenario, in order to maximize the safety of the driving motor 400, the first protection signal can be transmitted to the motor controller 200 and the second protection signal can be transmitted to the overcurrent protection module 20 at the same time when the motor driving current is overcurrent, so as to achieve reliable motor protection in the overcurrent scenario.

[0070] As can be seen from the above description, the overcurrent protection circuit 100 provided by the embodiments of the present application is applied to the motor controller 200 which outputs the motor driving current to the driving motor 400. The overcurrent protection circuit 100 is provided with the overcurrent protection module 20 and the detection module 10. The overcurrent protection module 20 can sample the motor driving current output from the output end of the motor controller 200 and transmit the motor driving current to the detection module 10. The detection module 10 can transmit the first protection signal to the motor controller 200 according to the overcurrent condition of the sampled motor driving current, so as to stop the motor controller 200 from outputting the motor driving current, and / or output the second protection signal to the overcurrent protection module 20 to cut off the transmission path of the motor driving current to the driving motor 400, so as to fully and reliably achieve double overcurrent protection of the driving motor 400 from two aspects.

[0071] Compared with the prior art, the overcurrent protection circuit 100 provided by the embodiments of the present application is completely determined by the motor driving current output by the motor controller 200. Therefore, even if the overcurrent protection of the motor controller 200 fails or the entire motor controller 200 fails, the overcurrent protection of the rear motor end can be quickly and reliably achieved without relying on the motor controller 200, and the reliability reduction problem of the motor controller 200 can also be assisted to be checked. Therefore, the overcurrent protection circuit 100 of the embodiments of the present application can effectively solve the overcurrent problem in the overcurrent protection failure scenario of the motor controller 200, so as to fully improve the stability and safety of the equipment.

[0072] Please see the followingFigure 3 , Figure 3 is a structural schematic diagram of the overcurrent protection circuit 100 provided by another embodiment of the present application. Optionally, according to some feasible embodiments of the present application, the overcurrent protection module 20 comprises a detection signal sampling sub-module 21 and a switch protection sub-module 22 arranged in series.

[0073] As shown in Figure 3 , the input end of the detection signal sampling sub-module 21 is electrically connected with the output end of the motor controller 200, the output end of the detection signal sampling sub-module 21 is electrically connected with the input end of the switch protection sub-module 22, and the output end of the switch protection sub-module 22 is electrically connected with the input end of the driving motor 400.

[0074] The detection signal output end of the detection signal sampling sub-module 21 is electrically connected with the signal input end of the detection module 10, for outputting a detection signal according to the motor driving current.

[0075] The control end of the switch protection sub-module 22 is electrically connected with the second signal output end of the detection module 10, for being turned off under the control of the second protection signal.

[0076] In a specific implementation, in order to facilitate detection signal processing and analysis, the detection signal sampling sub-module 21 can convert the current signal of the current driving current into a corresponding voltage signal, and then transmit the voltage signal as a detection signal to the detection module 10.

[0077] The detection signal sampling sub-module 21 can be implemented by using a shunt or the like, for example. Different shunts will produce different voltage drops for output, thereby achieving sampling of the detection signal in the form of a voltage signal, which is not strictly limited in this embodiment.

[0078] The switch protection sub-module 22 has a switching function, which can be turned off under the control of the detection module 10. In a normal motor operation process, the switch module sub-module 22 remains turned on, thereby transmitting the motor driving current output by the motor controller 200 to the driving motor 400, so that the motor controller 200 controls the working state of the motor.

[0079] It should be noted that, in Figure 3 some other embodiments not shown, the input end of the switch protection sub-module 22 is electrically connected with the output end of the motor controller 200, the output end of the switch protection sub-module 22 is electrically connected with the input end of the detection signal sampling sub-module 21, and the output end of the detection signal sampling sub-module 21 is electrically connected with the input end of the driving motor 400. This connection mode can also effectively achieve the function of the overcurrent protection module 20 of the present application, which is not strictly limited herein.

[0080] Optionally, according to some possible embodiments of the present application, in combination with actual production process and device application, in order to accurately and reasonably realize the functions of the detection signal sampling sub-module 21 and the switch protection sub-module 22, the detection signal sampling sub-module 21 includes a sampling resistor, and the detection signal is a voltage signal sampled based on the sampling resistor. The voltage signal may, for example, be a voltage difference across the sampling resistor, without strict limitation here. The number of sampling resistors may be more than one.

[0081] The switch protection sub-module 22 may include a fuse or a switch tube, which is used to be turned off under the control of the second protection signal. The switch tube is specifically implemented by, for example, a switching device such as a power switching device, for example, a semiconductor switching device such as an IGBT (Insulated Gate Bipolar Transistor), a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), without strict limitation here.

[0082] It should be noted that, considering that the fuse has relatively small size, low price, and fast response capability and high thermal stability, in order to fully guarantee the fast cutting-off of the motor driving current to the driving motor 400, a sampling fuse may be preferred to be selected to realize the function of the switch protection sub-module 22 when actual circuit device is selected.

[0083] After introducing the overcurrent protection module 20 in the overcurrent protection circuit 100, the various implementation manners of the detection module 10 will be introduced in detail. Optionally, according to some possible embodiments of the present application, the detection module 10 includes:

[0084] A signal comparison sub-module, the detection module 10 is configured to compare the detection signal with a preset reference signal to determine whether the detection signal indicates that the motor driving current reaches an overcurrent protection point.

[0085] An overcurrent timing sub-module, the overcurrent timing sub-module is configured to time the duration of overcurrent of the motor driving current to obtain an overcurrent duration of the motor driving current.

[0086] A signal generation sub-module, the signal generation sub-module is configured to generate a first protection signal and transmit the first protection signal to a signal feedback end of the motor controller 200 when the detection signal indicates that the motor driving current reaches the overcurrent protection point.

[0087] And, the signal generation submodule is further configured to generate a second protection signal and transmit the second protection signal to a control end of the overcurrent protection module 20 when the overcurrent duration of the motor driving current exceeds a preset duration.

[0088] In the embodiment, in order to control the cost of the device at a lower level, when the detection signal is a voltage signal, the signal comparator can be implemented as a voltage comparator, so as to compare and judge whether the detection signal indicates that the motor driving current has overcurrent by comparing the detection signal with a preset reference signal. The preset reference signal is associated with an overcurrent protection point of the current, which can be flexibly set according to the actual motor current-carrying capacity and overcurrent protection experience.

[0089] Taking the voltage comparator as an example, the output end of the voltage comparator is electrically connected with the overcurrent timing submodule and the signal generation submodule. The voltage comparator outputs a high level or a low level to the overcurrent timing submodule and the signal generation submodule according to different comparison results.

[0090] The overcurrent timing submodule can be implemented by a timer, which can be electrically connected with the voltage comparator and start timing according to the output of the voltage comparator. For example, when the motor driving current is detected to overcurrent for the first time, the voltage comparator outputs a high level in the case that the detection signal is greater than the preset reference signal, and the timer starts timing in this case.

[0091] If the voltage comparator continuously outputs a high voltage, the timer can continuously time. When the timer exceeds the preset duration, the timer can stop timing and send an enable signal to the signal generation submodule, which is used to indicate that the overcurrent duration of the motor driving current has exceeded the preset duration.

[0092] It should be noted that the preset duration can be flexibly set according to the actual motor current-carrying capacity and overcurrent protection experience, and is not strictly limited herein. After timing, the timer can automatically clear the timing.

[0093] The signal generation submodule can be implemented by a signal generator or other feasible devices (such as a microcontroller unit) having signal receiving and generating functions. The signal generation submodule is configured to generate a first protection signal and transmit the first protection signal to a signal feedback end of the motor controller 200 when the detection signal indicates that the motor driving current reaches the overcurrent protection point.

[0094] In combination with the foregoing example, the signal generation sub-module is electrically connected to the output end of the voltage comparator. When the voltage comparator first outputs a level indicating that the current is overcurrent, the signal generation sub-module transmits a first protection signal to the motor controller 200, so that the motor controller 200 stops outputting the driving motor current as soon as possible.

[0095] In addition, the signal generation sub-module is further configured to generate a second protection signal when the overcurrent duration of the motor driving current exceeds the preset duration, and transmit the second protection signal to the control end of the overcurrent protection module 20.

[0096] In combination with the foregoing example, when the signal generation sub-module receives the enable signal output by the timer, it indicates that the motor driving current has been in an overcurrent state for a long time, and the motor controller 200 in the front stage cannot normally play the overcurrent protection function.

[0097] In this case, the signal generation sub-module transmits a second protection signal to the control end of the overcurrent protection module 20, thereby forcibly cutting off the current transmission path of the motor driving current to the driving motor 400, thereby providing a higher level of reliable overcurrent protection for the driving motor 400.

[0098] The first protection signal and the second protection signal can be, for example, pulse signals, digital signals, etc., and the present application does not make strict limitations here.

[0099] Optionally, according to some feasible embodiments of the present application, the detection module 10 is a microcontroller unit (MCU). The MCU has functions of signal comparison, timing, timeout judgment, etc. Related personnel can configure the parameters such as overcurrent protection point and preset duration in advance through the MCU to realize the functions of detection judgment and signal generation of the MCU.

[0100] The microcontroller unit is configured to transmit a first protection signal to the signal feedback end of the motor controller 200 when the detection signal indicates that the motor driving current reaches the overcurrent protection point.

[0101] The microcontroller unit is further configured to receive an updated detection signal transmitted by the overcurrent protection module 20 after detecting for the first time that the motor driving current reaches the overcurrent protection point for a preset duration, and transmit a second protection signal to the control end of the overcurrent protection module 20 when the updated detection signal indicates that the motor driving current still reaches the overcurrent protection point.

[0102] It should be noted that the detection module 10 implemented by the microcontroller unit has similar functions as the foregoing embodiments, and thus will not be described in detail. In some more complex operation scenarios, the relevant personnel can also achieve more reasonable output of the first protection signal and the second protection signal according to the diversified functions of the MCU.

[0103] It can be understood that the above are examples, and do not substantially limit the overcurrent protection circuit 100 protected by the present application.

[0104] Based on the overcurrent protection circuit 100 provided by the embodiments, the present application provides an overcurrent protection circuit board, which comprises the overcurrent protection circuit 100 provided by any one of the embodiments of the present application and the motor controller 200. The overcurrent protection circuit 100 and the motor controller 200 can be manufactured in a circuit integrated manner to obtain the overcurrent protection circuit board.

[0105] Please refer to Figure 4 , Figure 4 is a structural schematic diagram of an overcurrent protection circuit board provided by an embodiment of the present application. As Figure 4 indicated, the overcurrent protection circuit board can be arranged between the battery pack 300 and the input end of the driving motor 400, so as to effectively control the driving motor 400 and fully guarantee the reliable current protection of the driving motor 400.

[0106] It should be understood that the overcurrent protection circuit board provided by the embodiments of the present application has the beneficial effects of the overcurrent protection circuit 100 provided by the embodiments of the present application, and specific descriptions can be referred to the specific descriptions of the overcurrent protection circuit 100 in the foregoing embodiments, which will not be described herein.

[0107] In order to better understand the control driving principle of the motor controller 200 to the driving motor 400, please refer to Figure 5 , Figure 5 is a structural schematic diagram of an overcurrent protection circuit board provided by an embodiment of the present application. As Figure 5 indicated, according to some feasible embodiments of the present application, the motor controller 200 specifically comprises a control module 30 and a driving module 40.

[0108] The control signal output end of the control module 30 is electrically connected with the control signal receiving end of the driving module 40. The control module 30 is configured to output a switching control signal to the control signal receiving end of the driving module 40 according to the expected working parameters of the driving motor 400.

[0109] The power input end of the drive module 40 is electrically connected with the battery pack 300. The output end of the drive module 40 is electrically connected with the input end of the drive motor 400. The drive module 40 is configured to output a motor drive signal to the input end of the drive motor 400 according to a switch control signal, so as to drive the drive motor 400 to work according to the expected working parameters.

[0110] In a specific implementation, the control module 30 can be implemented by an MCU or a DSP (Digital Signal Process) or other processor with a control function, which is not strictly limited herein. The control module 30 can be configured to provide a required switch control signal to the drive module 40. The switch control signal is usually a switch control signal of a power switch tube in the drive module 40, and is usually a PWM (Pulse Width Modulation) signal.

[0111] The drive module 40 specifically includes a three-phase inverter bridge. The outgoing line end of the three-phase inverter bridge is electrically connected with the input end of the drive motor 400. The three-phase inverter bridge is composed of six power switch tubes (for example, IGBTs). The six power switch tubes are configured to convert a direct-current voltage provided by the battery pack 300 into a three-phase alternating-current voltage under the control of the control module 40, so as to output a motor drive current to the input end of the drive motor 400. The motor drive current is a three-phase alternating-current current.

[0112] It should be noted that the control module 30 can change the switch control signal output to the drive module 40 according to the expected working parameters of the drive motor 400, so as to control the motor drive current output by the drive module 40, and further adjust the running state of the drive motor 400.

[0113] In a specific implementation, when the control module 40 receives the first protection signal transmitted by the detection module 10, the switch control signal can be adjusted to control the turn-off of each power switch tube in the drive module 40, so that the drive module 40 stops the three-phase inverter work, the current output by the output end of the drive module 40 is 0, and the drive motor 400 subsequently performs a safe shutdown. In this way, based on the overcurrent protection circuit board, reliable overcurrent protection of the drive motor 400 is fully achieved.

[0114] Please continue to see Figure 5 Optionally, according to some possible embodiments of the present application, the motor controller 200 further includes a Hall current sensor module 50 and a hardware overcurrent detection module 60.

[0115] The input end of the Hall current sensor module 50 is electrically connected with the output end of the driving module 40, the output end of the Hall current sensor module 50 is electrically connected with the input end of the hardware overcurrent detection module 60, and the output end of the hardware overcurrent detection module 60 is electrically connected with the signal feedback end of the control module 30.

[0116] The Hall current sensor module 50 is used for converting the motor driving current into a corresponding voltage sensing signal and transmitting the voltage sensing signal to the hardware overcurrent detection module 60.

[0117] The hardware overcurrent detection module 60 is used for transmitting a first level voltage or a second level voltage to the control module 30 according to the size of the voltage sensing signal, the first level voltage indicating that the motor driving current overflows, and the second level voltage indicating that the motor driving current does not overflow.

[0118] In the embodiment, the Hall current sensor module 50 specifically adopts a Hall voltage sensor or a shunt and the like to realize its function. Considering the diversity of the current Hall elements, the specific implementation device and the functional principle of the Hall current sensor module 50 are not described in detail.

[0119] The hardware overcurrent detection module 60 specifically can adopt, for example, a voltage comparator. After receiving the voltage sensing signal, the hardware overcurrent detection module 60 compares the voltage sensing signal with a preset reference voltage, so as to realize overcurrent judgment and transmit the first level voltage or the second level voltage to the control module 30 according to the overcurrent judgment result. The first level voltage is, for example, a high level, and the second level voltage is, for example, a low level, which is not strictly limited herein.

[0120] It should be noted that the overcurrent protection circuit 100 provided in the embodiment of the present application is a double overcurrent protection scheme proposed to solve the problem that the motor controller 200 cannot effectively realize overcurrent protection of the driving motor 400 in the case that the Hall current sensor module 50 and / or the hardware overcurrent detection module 60 fail.

[0121] It can be understood that the above are examples, which do not substantially limit the motor controller 200 or the overcurrent protection circuit board involved in the present application.

[0122] Figure 6 is a structural schematic diagram of a power consumption equipment 1000 provided in an embodiment of the present application. As shown in Figure 6 The present application provides a power consumption equipment 1000, which comprises a battery pack 300, a motor controller 200, an overcurrent protection circuit 100 provided in any one of the embodiments of the present application, and a driving motor 400.

[0123] Or, the electric device 1000 comprises: the battery pack 300, the overcurrent protection circuit board provided by any one of the embodiments of the present application, and the driving motor 400. The overcurrent protection circuit board is essentially a circuit board integrated by the motor controller 200 and the overcurrent protection circuit 100.

[0124] The electric device 1000 described above can be specifically an industrial electrical automation, an automatic production line, an industrial robot, and various military and civilian equipment, transportation, and other fields requiring a driving motor, such as an electric vehicle, an electric bicycle, and the like, without strict limitation.

[0125] The electric device 1000 provided by the embodiments of the present application has the beneficial effects of the overcurrent protection circuit 100 or the overcurrent protection circuit board described above, and specific descriptions can be referred to the specific descriptions of the overcurrent protection circuit 100 or the overcurrent protection circuit board in the above embodiments, which will not be repeated here.

[0126] The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a functional card, and the like. When implemented in software, the elements of the present application are program or code segments used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted through a data signal carried in a carrier wave over a transmission medium or communication link. The "machine-readable medium" can include any medium capable of storing or transmitting information. Examples of the machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, and the like. The code segments can be downloaded via a computer network such as the Internet, an intranet, and the like.

[0127] It should be noted that in this document, the term "comprising" or "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or inherent to such a process, method, article, or device.

[0128] It is to be understood that the embodiments described herein are merely exemplary and those skilled in the art will be able to make modifications and variations thereto without departing from the scope of the application. The foregoing description has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the application to the precise form disclosed. The described embodiments were chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application in various embodiments and with various modifications as are suited to the particular purpose contemplated. The application is not intended to be limited to the precise forms disclosed but is intended to include any and all modifications coming within the scope of the appended claims and their equivalents.

[0129] The principles and implementations of the present application have been described above with the specific examples. The above examples are only used to help understand the method of the present application and its core idea. The above is only the preferred embodiment of the present application. It should be pointed out that, due to the limitation of language expression, there are unlimited specific structures objectively. For ordinary skilled in the art, some improvements, refinements or changes can be made without departing from the principles of the present application, and the above technical features can be combined in a proper way. These improvements, refinements, changes or combinations, or the direct application of the ideas and technical solutions of the present application to other occasions without improvement, shall be regarded as the protection scope of the present application.

Claims

1. An overcurrent protection circuit, characterized by comprising: The overcurrent protection circuit is applied to a motor controller, a power input end of the motor controller is used for electrical connection with a battery pack, and an output end of the motor controller outputs a motor driving current under power supply of the battery pack; The overcurrent protection circuit comprises: An overcurrent protection module, an input end of the overcurrent protection module is electrically connected with an output end of the motor controller, and an output end of the overcurrent protection module is used for electrical connection with an input end of a driving motor; A detection module, a signal input end of the detection module is electrically connected with a detection signal output end of the overcurrent protection module, a first signal output end of the detection module is electrically connected with a signal feedback end of the motor controller, and a second signal output end of the detection module is electrically connected with a control end of the overcurrent protection module; The overcurrent protection module is used for transmitting a detection signal to the detection signal output end of the detection module according to the motor driving current; the detection module is used for transmitting a first protection signal to the signal feedback end of the motor controller according to the motor driving current, so that the motor controller stops outputting the motor driving current, and / or transmitting a second protection signal to the control end of the overcurrent protection module, so as to disconnect the overcurrent protection module.

2. The overcurrent protection circuit of claim 1, wherein, The overcurrent protection module comprises a detection signal sampling sub-module and a switch protection sub-module arranged in series; The input end of the detection signal sampling sub-module is electrically connected with the output end of the motor controller, the output end of the detection signal sampling sub-module is electrically connected with the input end of the switch protection sub-module, and the output end of the switch protection sub-module is electrically connected with the input end of the driving motor; Alternatively, the input end of the switch protection sub-module is electrically connected with the output end of the motor controller, the output end of the switch protection sub-module is electrically connected with the input end of the detection signal sampling sub-module, and the output end of the detection signal sampling sub-module is electrically connected with the input end of the driving motor; The detection signal output end of the detection signal sampling sub-module is electrically connected with the signal input end of the detection module, and is used for outputting the detection signal according to the motor driving current; The control end of the switch protection sub-module is electrically connected with the second signal output end of the detection module, and is used for being turned off under control of the second protection signal.

3. The overcurrent protection circuit of claim 2, wherein, The detection signal sampling sub-module comprises a sampling resistor, and the detection signal is a voltage signal sampled based on the sampling resistor; The switch protection sub-module comprises a fuse or a switch tube, and the fuse or the switch tube is used for being turned off under control of the second protection signal.

4. The overcurrent protection circuit of claim 1, wherein, The detection module comprises: A signal comparison sub-module, the detection module is used for comparing the detection signal with a preset reference signal to determine whether the detection signal indicates that the motor driving current reaches an overcurrent protection point; An overcurrent timing sub-module, the overcurrent timing sub-module is used for timing a duration when the motor driving current overflows to obtain an overcurrent duration of the motor driving current; The signal generation sub-module is configured to generate the first protection signal and transmit the first protection signal to a signal feedback end of the motor controller when the detection signal indicates that the motor drive current reaches the overcurrent protection point. The signal generation sub-module is further configured to generate the second protection signal and transmit the second protection signal to a control end of the overcurrent protection module when the overcurrent duration of the motor drive current exceeds a preset duration.

5. The overcurrent protection circuit of claim 1, wherein, The detection module is a microcontroller unit. The microcontroller unit is configured to transmit the first protection signal to a signal feedback end of the motor controller when the detection signal indicates that the motor drive current reaches the overcurrent protection point. The microcontroller unit is further configured to receive an updated detection signal transmitted by the overcurrent protection module after a preset duration from the first detection that the motor drive current reaches the overcurrent protection point, and transmit the second protection signal to a control end of the overcurrent protection module when the updated detection signal indicates that the motor drive current still reaches the overcurrent protection point.

6. An overcurrent protection circuit board, characterized by The overcurrent protection circuit board comprises the overcurrent protection circuit according to any one of claims 1-5 and a motor controller. The overcurrent protection circuit board is arranged between a battery pack and an input end of a drive motor.

7. The overcurrent protection circuit board of claim 6, wherein, The motor controller comprises a control module and a drive module. A control signal output end of the control module is electrically connected to a control signal receiving end of the drive module, and the control module is configured to output a switch control signal to the control signal receiving end of the drive module according to an expected working parameter of the drive motor. A power input end of the drive module is electrically connected to the battery pack, an output end of the drive module is electrically connected to an input end of the drive motor, and the drive module is configured to output a motor drive signal to the input end of the drive motor according to the switch control signal, so as to drive the drive motor to work according to the expected working parameter.

8. The overcurrent protection circuit board of claim 7, wherein, The motor controller further comprises a Hall current sensor module and a hardware overcurrent detection module. An input end of the Hall current sensor module is electrically connected to an output end of the drive module, an output end of the Hall current sensor module is electrically connected to an input end of the hardware overcurrent detection module, and an output end of the hardware overcurrent detection module is electrically connected to a signal feedback end of the control module. The Hall current sensor module is configured to convert the motor drive current into a corresponding voltage sensing signal and transmit the voltage sensing signal to the hardware overcurrent detection module. The hardware overcurrent detection module is configured to transmit a first level voltage or a second level voltage to the control module according to a size of the voltage sensing signal, the first level voltage indicating that the motor drive current overflows, and the second level voltage indicating that the motor drive current does not overflow.

9. The overcurrent protection circuit board of claim 7, wherein, The drive module comprises a three-phase inverter bridge, and outgoing lines of the three-phase inverter bridge are electrically connected to the input end of the drive motor. The three-phase inverter bridge is composed of six power switch tubes, which is used to convert the direct current voltage provided by the battery pack into three-phase alternating current voltage, so as to output the motor driving current to the input end of the driving motor, and the motor driving current is three-phase alternating current.

10. An electric device, characterized by The power consumption device comprises a battery pack, a motor controller, the overcurrent protection circuit according to any one of claims 1-5, and a driving motor. Alternatively, the power consumption device comprises the battery pack, the overcurrent protection circuit board according to any one of claims 6-9, and the driving motor.

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