Current-carrying capability test circuit for electronic speed regulator

Abstract

The invention provides a current-carrying capability test circuit for an electronic speed regulator. The current-carrying capability test circuit comprises a brushless direct current motor motion system, a second electronic speed regulator, a rectifier and a direct current electronic load. And after the second electronic speed regulator is pertinently modified, the second gate driving chip and the second three-phase full-bridge inverter circuit are kept to work. The brushless direct current motor motion system generates a low-voltage logic driving signal and outputs the low-voltage logic driving signal to the second electronic speed regulator; a second electronic speed regulator receives the signal through a second gate driving chip, drives a second three-phase full-bridge inverter circuit to work, and converts a second input direct current into a second three-phase alternating current which is synchronous with a driving signal switching time sequence; the rectifier rectifies the second three-phase alternating current into second direct current; the direct current electronic load receives the second direct current and simulates current stress applied to the second electronic speed regulator under different load working systems. The controllable and reproducible current-carrying capability test with the electronic speed regulator as a single test object is realized.

Description

Technical Field

[0001] This application relates to the field of electronic speed controller testing technology, and more specifically, to an electronic speed controller current carrying capacity testing circuit. Background Technology

[0002] The electronic speed controller (ESC) is a core component of an unmanned aerial vehicle (UAV) system. Located between the flight control unit (FCU) and the brushless DC motor, it receives throttle signals (such as PWM or DShot protocol signals) from the FCU and drives the brushless DC motor to rotate at the target speed. The current-carrying capacity of the ESC refers to its ability to continuously or instantaneously handle current while ensuring safety, reliability, and no damage. It is a key indicator for matching motor power and ensuring flight performance and safety.

[0003] Currently, commercially available electronic speed controllers (ESCs) typically test their current-carrying capacity by connecting a brushless DC motor with a propeller and inputting a throttle signal. However, during the test, the introduction of the brushless DC motor and propeller as variables affects the ESC's current-carrying capacity data. Furthermore, the ESC's microprocessor (MCU) possesses closed-loop drive control and stall protection functions, monitoring the brushless DC motor's back electromotive force and phase current in real time. Only when both parameters are within normal ranges will the ESC continuously drive the brushless DC motor to rotate at the target speed.

[0004] Existing solutions can only perform limited current-carrying capacity tests on electronic speed governors under certain motor and propeller combinations as load conditions. They cannot guarantee that the electronic speed governor is under safe and controllable conditions to achieve a balance between maximum current carrying capacity and physical heat dissipation. Furthermore, in existing solutions, the electronic speed governor, as a crucial component of the speed-regulating electric drive system, has a fixed load duty cycle, making it impossible to measure the corresponding current ratings under different load duty cycles as defined in GB / T 12668.6 using a controllable load. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a current-carrying capacity test circuit for electronic speed controllers to overcome the problems in the prior art.

[0006] In a first aspect, embodiments of this application provide an electronic speed controller current-carrying capacity test circuit for testing the current-carrying capacity of a second electronic speed controller, comprising: a brushless DC motor motion system, a second electronic speed controller, a rectifier, and a DC electronic load; the second electronic speed controller comprises: a second gate driver chip, a second three-phase full-bridge inverter circuit, and a second microprocessor; wherein, the second electronic speed controller is specifically modified: the power input terminal of the second microprocessor is disconnected, and its low-voltage logic drive signal output pin is in a high-impedance state; The brushless DC motor motion system is used to generate a low-voltage logic drive signal and output the low-voltage logic drive signal to the second electronic speed controller. The second electronic speed controller is used to receive the low-voltage logic drive signal through the second gate drive chip, and drive the second three-phase full-bridge inverter circuit to work according to the low-voltage logic drive signal, so as to convert the second input DC power into a second three-phase AC power synchronized with the switching timing of the low-voltage logic drive signal; The rectifier is used to receive the second three-phase AC power and rectify it into the second DC power; The DC electronic load is used to receive the second DC power and, by setting different current parameters, operating modes and test sequences, simulate the current stress applied to the second electronic speed controller under different load conditions.

[0007] In some technical solutions of this application, the above-mentioned brushless DC motor motion system includes: a first voltage regulator, a control signal generation device, a first electronic speed controller, and a brushless DC motor; The first voltage regulator is used to power the control signal generating device and the first electronic speed controller. The control signal generating device is used to provide control signals to the first electronic speed controller; The first electronic speed controller is used to drive the brushless DC motor to rotate according to the control signal and output the low-voltage logic drive signal.

[0008] In some technical solutions of this application, the first electronic speed controller includes: a first microprocessor, a first linear power supply chip, a first pull-down resistor, a first gate drive chip, and a first three-phase full-bridge inverter circuit; The first linear power supply chip is used to power the first microprocessor; The first microprocessor is used to receive the control signal provided by the control signal generation device, and generate a low-voltage logic drive signal based on the back electromotive force feedback signal generated during the operation of the brushless DC motor. The first pull-down resistor is used to receive the low-voltage logic drive signal and clamp the low-voltage logic drive signal to ground level when the first microprocessor is in a high-impedance state, so as to prevent the first gate driver chip from being triggered erroneously. The first gate driver chip is used to receive the low-voltage logic drive signal, and output the drive signal after level conversion; The first three-phase full-bridge inverter circuit is used to perform switching operations according to the drive signal, converting the DC power provided by the first voltage regulator into the first three-phase AC power to drive the brushless DC motor.

[0009] In some technical solutions of this application, the above-mentioned test circuit also includes a temperature acquisition device for acquiring temperature distribution information during the operation of the second electronic speed controller.

[0010] In some technical solutions of this application, the temperature acquisition device includes a non-contact infrared thermal imager or a contact thermocouple.

[0011] In some technical solutions of this application, the above-mentioned test circuit also includes a voltage acquisition device for real-time acquisition of the voltage waveform after rectification of the second and third phase AC power.

[0012] In some technical solutions of this application, the voltage acquisition device includes: a contact oscilloscope or a non-contact voltage probe instrument.

[0013] In some technical solutions of this application, the aforementioned control signal generation device includes: a PWM generator or a digital serial signal source or analog voltage signal source capable of transmitting other protocols.

[0014] In some technical solutions of this application, the brushless DC motor is in an unloaded state without a propeller or in a loaded state with a propeller.

[0015] In some technical solutions of this application, the aforementioned DC electronic load sets the current parameters, operating mode, and test sequence according to the first electronic speed controller during the operation of the brushless DC motor in the no-load state and the load state.

[0016] The technical solutions provided by the embodiments of this application may include the following beneficial effects: This application provides an electronic speed controller current-carrying capacity test circuit for testing the current-carrying capacity of a second electronic speed controller, comprising: a brushless DC motor motion system, a second electronic speed controller, a rectifier, and a DC electronic load; the second electronic speed controller includes: a second gate driver chip, a second three-phase full-bridge inverter circuit, and a second microprocessor; wherein, the second electronic speed controller is specifically modified: the power input terminal of the second microprocessor is disconnected, and its low-voltage logic drive signal output pin is in a high-impedance state; the brushless DC motor motion system is used to generate a low-voltage logic drive signal and output the low-voltage logic drive signal to the second microprocessor. The second electronic speed controller is used to receive the low-voltage logic drive signal through the second gate driver chip and drive the second three-phase full-bridge inverter circuit to work according to the low-voltage logic drive signal, so as to convert the second input DC power into a second three-phase AC power synchronized with the switching timing of the low-voltage logic drive signal; the rectifier is used to receive the second three-phase AC power and rectify it into a second DC power; the DC electronic load is used to receive the second DC power and simulate the current stress applied to the second electronic speed controller under different load conditions by setting different current parameters, working modes and test sequences.

[0017] This application effectively eliminates the interference of brushless DC motor and propeller performance on test results, and realizes controllable and reproducible current carrying capacity test with the second electronic speed controller as the single test object. It can comprehensively evaluate its current carrying performance under various operating conditions such as continuous duty, short-time duty, and intermittent periodic duty, and provides an accurate and reliable test method for the performance evaluation and selection matching of electronic speed controllers.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of an electronic speed controller current-carrying capacity test circuit provided in an embodiment of this application is shown; Figure 2 This illustration shows a connection diagram of a dual-loop circuit provided in an embodiment of this application; Figure 3This illustration shows a connection diagram related to a first electronic speed controller provided in an embodiment of this application; Figure 4 A connection diagram related to a second electronic speed controller provided in an embodiment of this application is shown. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0022] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0024] Based on this, the present application provides an electronic speed controller current carrying capacity test circuit, which will be described below through embodiments.

[0025] Figure 1 A schematic diagram of an electronic speed controller current-carrying capacity test circuit according to an embodiment of this application is shown. Some embodiments of this application are described in detail below. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] This application provides an electronic speed controller current-carrying capacity test circuit, which is used to test the current-carrying capacity of a second electronic speed controller. Current-carrying capacity refers to the amount of current it can continuously or instantaneously handle under safe and reliable conditions. The test circuit of this application mainly includes: a brushless DC motor motion system, a second electronic speed controller, a rectifier, and a DC electronic load. In specific implementation, the test circuit in this application embodiment can be connected through two loops, such as... Figure 2 As shown. The first circuit includes a brushless DC motor motion system, and the second circuit includes a second voltage regulator, a second electronic speed controller, a rectifier, and a DC electronic load.

[0027] In the test circuit, the brushless DC motor motion system first runs to generate a low-voltage logic drive signal that is completely consistent with the actual motor drive state. This signal contains the correct switching timing information and is directly sent to the second electronic speed controller. The second electronic speed controller receives this signal through its internal second gate driver chip. Since the second microprocessor has been disconnected from power and its pins are in a high-impedance state and do not participate in operation, the low-voltage logic drive signal directly controls the second gate driver chip to drive the second three-phase full-bridge inverter circuit, converting the second input DC power from the second voltage regulator into a second three-phase AC power that is completely synchronized with the switching timing of the low-voltage logic drive signal. This second three-phase AC power is rectified by a rectifier to become a second DC power and input to a DC electronic load. The DC electronic load applies precise and controllable current stress to the second electronic speed controller by preset different current parameters, operating modes, and test sequences, thereby simulating the current-carrying conditions under different load operating conditions. Through the above process, a controllable and reproducible current-carrying capacity test is achieved using the second electronic speed controller as a single test object, under the condition of eliminating interference from the actual motor and propeller load.

[0028] In an optional embodiment, the brushless DC motor motion system of this application includes a first voltage regulator, a control signal generation device, a first electronic speed controller, and a brushless DC motor. The first voltage regulator, as a DC power supply device, is a low-power DC power supply instrument whose main function is to power low-power devices and enable them to operate normally. Its power output terminal is electrically connected to the power input terminal of the control signal generation device and the power input terminal of the first electronic speed controller, respectively, to provide stable operating voltage and current for both. The control signal generation device can be a PWM generator, a digital serial signal source, or an analog voltage signal source. Its signal output terminal is electrically connected to the control signal input terminal of the first electronic speed controller, used to send a control signal containing a speed command to the first electronic speed controller. The first electronic speed controller, as a complete, unmodified electronic speed controller, has its three-phase AC output terminal electrically connected to the three-phase winding terminals of the brushless DC motor, used to drive the brushless DC motor to rotate according to the received control signal. During the rotation of the brushless DC motor driven by the first electronic speed controller, the back electromotive force feedback signal generated by the brushless DC motor is detected in real time by the microprocessor inside the first electronic speed controller. Based on this feedback signal, the microprocessor adjusts the switching timing of the drive signals, thereby generating a low-voltage logic drive signal that is completely consistent with the actual motor drive state. This low-voltage logic drive signal is output from the low-voltage logic drive signal output terminal of the first electronic speed controller and serves as the output signal of the brushless DC motor motion system, provided to the second electronic speed controller. Through the above connection relationship and signal flow, the brushless DC motor motion system can generate a low-voltage logic drive signal that accurately reflects the real motor drive state, providing reliable switching timing instructions for the subsequent current-carrying capacity test of the second electronic speed controller.

[0029] In an alternative implementation, such as Figure 3 As shown, the complete, unmodified first electronic speed controller includes a first microprocessor, a first linear power supply chip, a first pull-down resistor, a first gate driver chip, and a first three-phase full-bridge inverter circuit. The input terminal of the first linear power supply chip is connected to the power output terminal of a first voltage regulator, and its output terminal is connected to the power input terminal of the first microprocessor, providing a stable operating voltage for the first microprocessor. The control signal input terminal of the first microprocessor is connected to the signal output terminal of a control signal generation device, receiving control signals provided by the control signal generation device. Simultaneously, the back EMF detection terminal of the first microprocessor is connected to the three-phase winding terminals of the brushless DC motor, detecting the back EMF feedback signal generated during the operation of the brushless DC motor in real time. Based on the received control signal and back EMF feedback signal, the first microprocessor generates a low-voltage logic drive signal that matches the actual operating state of the motor through an internal algorithm. This signal is output from the low-voltage logic drive signal output pin of the first microprocessor.

[0030] One end of the first pull-down resistor is connected to the low-voltage logic drive signal output pin of the first microprocessor, and the other end is grounded. The function of this pull-down resistor is to clamp the low-voltage logic drive signal to ground when the first microprocessor is in a high-impedance state (such as during startup or reset), preventing the first gate driver chip from being falsely triggered due to a floating signal line, thus ensuring the safety and reliability of the system. During normal operation, the first microprocessor actively outputs high and low level signals, and the first pull-down resistor exists only as a small load, not affecting normal signal transmission.

[0031] The input terminal of the first gate driver chip is connected to the low-voltage logic drive signal output pin of the first microprocessor to receive the low-voltage logic drive signal generated by the first microprocessor. The chip performs level conversion and power amplification on the received low-voltage logic signal, converting it from a logic level of 3.3V or 5V to a gate drive voltage of 10V-15V, and outputs a drive signal with sufficient drive capability to meet the switching requirements of the power MOSFET.

[0032] The first three-phase full-bridge inverter circuit consists of six power MOSFETs. Its control terminals are connected to the six output terminals of the first gate driver chip to receive amplified drive signals. Its DC input terminal is connected to the power output terminal of the first voltage regulator to receive DC power from the first voltage regulator. Its three-phase AC output terminal is connected to the three-phase winding terminals of the brushless DC motor. Based on the drive signals output by the first gate driver chip, the first three-phase full-bridge inverter circuit controls the six MOSFETs to turn on and off in a specific timing sequence, converting the DC power provided by the first voltage regulator into the first three-phase AC power required to drive the brushless DC motor.

[0033] Through the coordinated operation of the aforementioned components, the first electronic speed controller achieves precise control of the brushless DC motor: the first microprocessor generates the correct switching timing based on control commands and motor back EMF feedback; the first gate driver chip amplifies the low-voltage logic signal to a gate signal sufficient to drive the power transistors; and the first three-phase full-bridge inverter circuit performs switching actions to convert DC power into AC power to drive the motor rotation. Simultaneously, the low-voltage logic drive signal generated by the first microprocessor is not only used to drive its own first three-phase full-bridge inverter circuit but is also extracted as the output signal of the brushless DC motor motion system, provided to the second electronic speed controller, thereby providing precise switching timing commands for subsequent current-carrying capacity testing.

[0034] In an alternative implementation, such as Figure 4As shown, the second electronic speed controller in this embodiment is the same model as the first electronic speed controller, but it is a component that has undergone targeted modifications. These modifications mainly include the following aspects: First, the original linear power supply chip of the second electronic speed controller is removed, disconnecting the power input of the second microprocessor and causing it to be in a non-powered state. Second, the six resistors that originally pulled the low-voltage logic drive signals to ground are removed; these resistors were originally connected between the low-voltage logic drive signal output pins of the second microprocessor and ground. Finally, the original control signal input of the second electronic speed controller is removed to ensure it is not interfered with by external control signals. After the above modifications, the second microprocessor is completely inactive because its power supply is cut off. Its six pins, originally used to output low-voltage logic drive signals, are in a high-impedance state, equivalent to being disconnected from the circuit, thus neither outputting signals nor affecting externally input signals. Simultaneously, since the pull-down resistors have been removed, the problem of altering signal impedance and causing signal distortion due to parallel connection with external input signals is avoided.

[0035] In other words, although the second electronic speed controller in this application still includes a second microprocessor in its physical structure, the microprocessor is actually inactive. Therefore, the effective working components of the second electronic speed controller mainly include the second gate driver chip and the second three-phase full-bridge inverter circuit. The power input terminal of the second microprocessor is disconnected, and its low-voltage logic drive signal output pin is in a high-impedance state. With this modification, the second electronic speed controller becomes a pure power execution unit. Its second gate driver chip directly receives the low-voltage logic drive signal from the first electronic speed controller and drives the second three-phase full-bridge inverter circuit accordingly. This converts the externally input second input DC power into second three-phase AC power synchronized with the switching timing of the low-voltage logic drive signal, thereby simulating the motor drive state under conditions without a real motor load, providing a basis for subsequent current-carrying capacity testing.

[0036] In an optional embodiment, the test circuit in this application further includes a temperature acquisition device for acquiring temperature distribution information of the second electronic speed controller during operation. The temperature acquisition device can be a non-contact infrared thermal imager or a contact thermocouple. When using an infrared thermal imager, the device is aimed non-contactly at the second electronic speed controller, capturing the infrared radiation energy on its surface in real time and converting it into a visualized temperature distribution image. The accompanying software records the continuous temperature change over time, thereby accurately determining whether the second electronic speed controller has reached a physical heat dissipation equilibrium state. When using a thermocouple, the thermocouple probe is attached to a key heat-generating part of the second electronic speed controller (such as the MOSFET housing or heat sink surface), directly measuring temperature changes through contact and transmitting the temperature data to a data recording device in real time. During the test, the temperature acquisition device continuously monitors the temperature changes of the second electronic speed controller, especially when the DC electronic load is set with different current parameters and operating modes, analyzing its temperature rise rate, peak temperature, and thermal equilibrium point, providing crucial data support for evaluating the thermal performance and current-carrying capacity of the second electronic speed controller under different load operating conditions. Monitoring by the temperature acquisition device ensures that the second electronic speed controller always operates within the rated temperature range during the test, preventing overheating damage, and accurately obtains its thermal balance characteristics under different current stresses.

[0037] In an optional embodiment, the test circuit in this application further includes a voltage acquisition device, which is used to acquire the voltage waveform of the rectified second-phase three-phase AC power in real time. The input terminal of the voltage acquisition device is connected to the DC output terminal of the rectifier, that is, connected to the output port of the second DC power formed after the second-phase three-phase AC power is rectified, and is used to monitor the voltage waveform changes of the DC power. Since the second-phase three-phase AC power is converted by the second electronic speed controller according to the switching timing of the low-voltage logic drive signal, its rectified voltage waveform directly reflects the working state of the second electronic speed controller and the duty cycle of the drive signal. The voltage acquisition device can be a contact oscilloscope or a non-contact voltage probe instrument. When a contact oscilloscope is used, the oscilloscope probe is directly connected to the DC output terminal of the rectifier, and the oscilloscope displays the voltage waveform in real time and can record parameters such as the duty cycle, amplitude, and frequency of the waveform. When a non-contact voltage probe is used, the probe does not need to directly contact the circuit and acquires voltage waveform information through electric field induction, which is suitable for high-voltage or difficult-to-contact test scenarios. During testing, the voltage acquisition device plays a crucial role: when the output of the brushless DC motor motion system is adjusted via a PWM generator or other control signal generation device, the voltage waveform after rectification of the second and third phase AC power will change accordingly. By analyzing whether the waveform duty cycle reaches 100% or other specific waveform requirements, it can be determined whether the second electronic speed controller has entered a full-power or other specific power output state, serving as the starting point for recording temperature data and conducting current-carrying capacity tests. Simultaneously, the waveform stability monitored by the voltage acquisition device can also reflect whether the second electronic speed controller is operating normally, whether there are abnormal switches or waveform distortion issues, ensuring the accuracy of the test results.

[0038] In an optional implementation, the brushless DC motor can be configured into two different operating states according to testing requirements: an unloaded state without a propeller and a loaded state with a propeller. When the brushless DC motor is configured into an unloaded state without a propeller, its rotation only needs to overcome its own mechanical friction and wind resistance, resulting in low power consumption and a small required drive current. In this case, the first electronic speed controller operates under unload conditions, and the generated low-voltage logic drive signal reflects the switching timing characteristics of the motor under unload conditions. When the brushless DC motor is configured into a loaded state with a propeller, the propeller rotation generates aerodynamic drag, requiring the motor to output greater power and significantly increasing the required drive current. In this case, the first electronic speed controller operates under the load conditions of actual flight, and the generated low-voltage logic drive signal reflects the switching timing characteristics of the motor under load conditions. These two operating states correspond to different application scenarios: the unloaded state is suitable for preliminary debugging, signal verification, and low-power testing scenarios, while the loaded state is closer to the actual operating conditions of the UAV during flight, enabling a more comprehensive evaluation of the electronic speed controller's performance in actual use.

[0039] Based on this, the current parameters, operating mode, and test sequence of the DC electronic load can be set according to the working process of the first electronic speed controller under the two motor states mentioned above. Specifically, before conducting formal testing, the brushless DC motor motion system can be operated independently, and the voltage and current data displayed by the first voltage regulator, as well as the operating parameters of the first electronic speed controller, can be recorded when the motor is running under no-load and load conditions. These data reflect the actual current stress and power requirements borne by the electronic speed controller under different operating conditions. Subsequently, the voltage and current limit parameters of the second voltage regulator are set according to the recorded data, and the corresponding current parameters, operating mode, and test sequence are set on the DC electronic load. For example, when it is necessary to simulate the current carrying capacity under no-load conditions, a lower current parameter can be set; when it is necessary to simulate the current carrying capacity under load conditions, a higher current parameter can be set, and test sequences such as periodic loads or short-term overloads can be set according to the acceleration and deceleration processes that may occur in actual flight. In this way, the DC electronic load can accurately reproduce the current stress conditions experienced by the first electronic speed controller when driving a real motor, thus allowing the second electronic speed controller to be tested under current stress equivalent to real operating conditions, ensuring the accuracy and reliability of the test results. Furthermore, since the current parameters of the DC electronic load can be set based on measured data of the first electronic speed controller under different motor conditions, the testing process has good controllability and reproducibility, meeting the needs for a comprehensive evaluation of the current-carrying capacity of electronic speed controllers under different load conditions.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. All should be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A current-carrying capacity testing circuit for an electronic speed controller, characterized in that, The test equipment for the current-carrying capacity of the second electronic speed controller includes: a brushless DC motor motion system, a second electronic speed controller, a rectifier, and a DC electronic load; the second electronic speed controller includes: a second gate driver chip, a second three-phase full-bridge inverter circuit, and a second microprocessor; wherein, the second electronic speed controller has been specifically modified: the power input terminal of the second microprocessor is disconnected, and its low-voltage logic drive signal output pin is in a high-impedance state; The brushless DC motor motion system is used to generate a low-voltage logic drive signal and output the low-voltage logic drive signal to the second electronic speed controller. The second electronic speed controller is used to receive the low-voltage logic drive signal through the second gate drive chip, and drive the second three-phase full-bridge inverter circuit to work according to the low-voltage logic drive signal, so as to convert the second input DC power into a second three-phase AC power synchronized with the switching timing of the low-voltage logic drive signal; The rectifier is used to receive the second three-phase AC power and rectify it into the second DC power; The DC electronic load is used to receive the second DC power and, by setting different current parameters, operating modes and test sequences, simulate the current stress applied to the second electronic speed controller under different load conditions.

2. The test circuit according to claim 1, characterized in that, The brushless DC motor motion system includes: a first voltage regulator, a control signal generation device, a first electronic speed controller, and a brushless DC motor; The first voltage regulator is used to power the control signal generating device and the first electronic speed controller. The control signal generating device is used to provide control signals to the first electronic speed controller; The first electronic speed controller is used to drive the brushless DC motor to rotate according to the control signal and output the low-voltage logic drive signal.

3. The test circuit according to claim 2, characterized in that, The first electronic speed controller includes: a first microprocessor, a first linear power supply chip, a first pull-down resistor, a first gate drive chip, and a first three-phase full-bridge inverter circuit; The first linear power supply chip is used to power the first microprocessor; The first microprocessor is used to receive the control signal provided by the control signal generation device, and generate a low-voltage logic drive signal based on the back electromotive force feedback signal generated during the operation of the brushless DC motor. The first pull-down resistor is used to receive the low-voltage logic drive signal and clamp the low-voltage logic drive signal to ground level when the first microprocessor is in a high-impedance state, so as to prevent the first gate driver chip from being triggered erroneously. The first gate driver chip is used to receive the low-voltage logic drive signal, and output the drive signal after level conversion; The first three-phase full-bridge inverter circuit is used to perform switching operations according to the drive signal, converting the DC power provided by the first voltage regulator into the first three-phase AC power to drive the brushless DC motor.

4. The test circuit according to claim 1, characterized in that, It also includes a temperature acquisition device for collecting temperature distribution information during the operation of the second electronic speed controller.

5. The test circuit according to claim 4, characterized in that, The temperature acquisition device includes a non-contact infrared thermal imager or a contact thermocouple.

6. The test circuit according to claim 1, characterized in that, It also includes a voltage acquisition device for real-time acquisition of the voltage waveform after the second and third phase AC power is rectified.

7. The test circuit according to claim 6, characterized in that, The voltage acquisition device includes: a contact oscilloscope or a non-contact voltage probe instrument.

8. The test circuit according to claim 2, characterized in that, The control signal generation device includes: a PWM generator or a digital serial signal source or analog voltage signal source capable of sending other protocols.

9. The test circuit according to claim 2, characterized in that, The brushless DC motor is either in an unloaded state without a propeller or in a loaded state with a propeller.

10. The test circuit according to claim 9, characterized in that, The DC electronic load sets the current parameters, operating mode, and test sequence according to the first electronic speed controller during the operation of the brushless DC motor in the no-load and load states.

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