Current detection circuit of motor controller, motor controller and vehicle

Abstract

The application relates to the technical field of motor controllers, and discloses a current detection circuit of a motor controller, the motor controller and a vehicle, which comprise a signal input module used for receiving an initial voltage signal obtained by detecting three-phase current; a signal processing module connected with the signal input module to receive the initial voltage signal and process the initial voltage signal to obtain a target voltage signal, the voltage value of the target voltage signal being smaller than that of the initial voltage signal; and a current judgment module connected with the signal processing module to receive the target voltage signal and output a judgment signal based on the target voltage signal, the judgment signal being used for judging whether the three-phase current is overcurrent. Therefore, through the setting of the signal processing module, the voltage value of the voltage signal of the signal input module can be reduced and then input into the current judgment module, so that the current judgment module can use a power supply with lower voltage, an additional power supply is avoided, and the complexity and cost of the system are reduced.

Description

Technical Field

[0001] This application relates to the field of motor controller technology, specifically to a current detection circuit for a motor controller, a motor controller, and a vehicle. Background Technology

[0002] Currently, in the three-phase AC overcurrent detection circuit of the motor controller, the detection signal obtained by the input sensor is usually a sinusoidal AC signal with an input voltage of 0.5V to 4.5V. The detection signal is compared with the reference voltage by the signal comparator to obtain the detection result of whether there is an overcurrent.

[0003] In related technologies, the power supply for signal comparators needs to be greater than 6.5V. However, the most common power supplies in digital circuits are generally 3.3V or 5V, neither of which are above 6.5V. Therefore, most circuits in related technologies use a power supply of 10V or higher, adding an extra power supply and increasing system complexity and cost. Utility Model Content

[0004] In view of the above problems, this application provides a current detection circuit for a motor controller, a motor controller, and a vehicle. By setting the signal processing module, the voltage value of the voltage signal from the signal input module can be reduced before being input to the current judgment module, so that the current judgment module can use a lower voltage power supply, avoiding the need to add an extra power supply and reducing the complexity and cost of the system.

[0005] The first aspect of this application provides a current detection circuit for a motor controller, comprising: a signal input module for receiving an initial voltage signal obtained from the detection of three-phase current; a signal processing module connected to the signal input module for receiving the initial voltage signal and processing the initial voltage signal to obtain a target voltage signal, wherein the voltage value of the target voltage signal is less than the voltage value of the initial voltage signal; and a current judgment module connected to the signal processing module for receiving the target voltage signal and outputting a judgment signal based on the target voltage signal, wherein the judgment signal is used to determine whether the three-phase current is overcurrent.

[0006] In some specific embodiments, the signal processing module includes a first resistor and a second resistor. The first end of the first resistor is connected to the output end of the signal input module, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, and the first end of the second resistor is the output end of the signal processing module.

[0007] In some specific embodiments, the signal processing module further includes a third resistor and a first power supply, wherein the first end of the third resistor is connected to the first end of the second resistor, and the second end of the third resistor is connected to the first power supply.

[0008] In some specific embodiments, the signal processing module further includes a first capacitor and a second capacitor. The two ends of the first capacitor are respectively connected to the two ends of the first resistor, and the two ends of the second capacitor are respectively connected to the two ends of the second resistor. The first capacitor and the second capacitor are used to adjust the bandwidth of the signal processing module.

[0009] In some specific embodiments, the signal processing module further includes a first capacitor, a second capacitor, and a third capacitor. The two ends of the first capacitor are respectively connected to the two ends of the first resistor, the two ends of the second capacitor are respectively connected to the two ends of the second resistor, and the two ends of the third capacitor are respectively connected to the two ends of the third resistor. The first capacitor, the second capacitor, and the third capacitor are used to adjust the bandwidth of the signal processing module.

[0010] In some specific embodiments, the current judgment module includes a first signal comparison module, a second signal comparison module, a second power supply, and a third power supply. The positive input terminal of the first signal comparison module is connected to the second power supply, the negative input terminal of the second signal comparison module is connected to the third power supply, and both the negative input terminal of the first signal comparison module and the positive input terminal of the second signal comparison module are connected to the output terminal of the signal processing module. The output terminals of the first signal comparison module and the second signal comparison module are used to output a judgment signal.

[0011] In some specific embodiments, the current judgment module further includes a fourth resistor and a fifth resistor. The first end of the fourth resistor is connected to the second power supply, the second end of the fourth resistor is connected to the first end of the fifth resistor, the second end of the fifth resistor is grounded, and the first end of the fifth resistor is connected to the positive input terminal of the first signal comparison module. The current judgment module further includes a sixth resistor and a seventh resistor. The first end of the sixth resistor is connected to the third power supply, the second end of the sixth resistor is connected to the first end of the seventh resistor, the second end of the seventh resistor is grounded, and the first end of the seventh resistor is connected to the negative input terminal of the second signal comparison module.

[0012] In some specific embodiments, the current determination module further includes a fourth power supply, which is connected to the positive terminal of the power supply of the first signal comparison module, and the negative terminal of the power supply of the first signal comparison module is grounded.

[0013] A second aspect of this application provides a motor controller, including a current detection circuit of any of the motor controllers described above.

[0014] A third aspect of this application provides a vehicle including a current detection circuit for any of the aforementioned motor controllers.

[0015] This application has at least the following beneficial effects: Based on the current detection circuit of the motor controller, the motor controller, and the vehicle provided in this application, the detection circuit includes: a signal input module for receiving an initial voltage signal obtained from the detection of three-phase current; a signal processing module connected to the signal input module to receive the initial voltage signal and process the initial voltage signal to obtain a target voltage signal, the voltage value of the target voltage signal being less than the voltage value of the initial voltage signal; and a current judgment module connected to the signal processing module to receive the target voltage signal and output a judgment signal based on the target voltage signal, the judgment signal being used to determine whether the three-phase current is overcurrent. Therefore, by setting the signal processing module, the voltage value of the voltage signal from the signal input module can be reduced before being input to the current judgment module, allowing the current judgment module to use a lower voltage power supply, avoiding the need for an additional power supply, and reducing the complexity and cost of the system.

[0016] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a circuit diagram of one embodiment of the current detection circuit of the motor controller provided in this application;

[0019] Figure 2 This is a circuit diagram of another embodiment of the current detection circuit of the motor controller provided in this application;

[0020] Figure 3 This is a circuit diagram of yet another embodiment of the current detection circuit of the motor controller provided in this application;

[0021] Figure 4 This is a circuit diagram of another embodiment of the current detection circuit of the motor controller provided in this application.

[0022] Explanation of reference numerals in the attached diagram: Current detection circuit 100 of the motor controller, signal input module 10, first resistor R1, second resistor R2, third resistor R3, first power supply VCC1, first capacitor C1, second capacitor C2, third capacitor C3, signal processing module 20, current judgment module 30, first signal comparison module 31, second signal comparison module 32, second power supply VCC2, third power supply VCC3, fourth power supply VCC4, fourth resistor R4, fifth resistor R5, sixth resistor R6, and seventh resistor R7.

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0027] The first aspect of this application provides a current detection circuit 100 for a motor controller. Figure 1 This is a circuit diagram of an embodiment of the current detection circuit 100 of the motor controller provided in this application.

[0028] Combination Figure 1 The current detection circuit 100 of the motor controller includes a signal input module 10, a signal processing module 20, and a current judgment module 30. The signal input module 10 is used to receive the initial voltage signal obtained from the detection of the three-phase current. The signal processing module 20 is connected to the signal input module 10 to receive the initial voltage signal and process the initial voltage signal to obtain the target voltage signal. The current judgment module 30 is connected to the signal processing module 20 to receive the target voltage signal and output a judgment signal based on the target voltage signal. The judgment signal is used to determine whether the three-phase current is overcurrent.

[0029] Specifically, the motor controller can be equipped with sensors to detect the three-phase current of the motor controller. When the sensors detect the three-phase current, they generate an initial voltage signal, which reflects the magnitude of the three-phase current. The sensor can be a Hall effect sensor. The signal input module 10 can be connected to the sensor to receive the initial voltage signal output by the sensor. The main function of the signal processing module 20 is to convert the initial voltage signal into a target voltage signal with a smaller voltage value and transmit the target voltage signal to the current judgment module 30. The current judgment module 30 can generate a judgment signal based on the target voltage signal and preset judgment rules. This judgment signal reflects whether the three-phase current is overcurrent.

[0030] It should be understood that in related technologies, the initial voltage signal output by the signal input module 10 is directly input to the current judgment module 30, requiring a larger power supply for the current judgment module 30. To provide this larger power supply, an additional power supply is typically added, increasing system complexity and cost. Based on the current detection circuit 100 of the motor controller provided in this application, the signal processing module 20 can reduce the voltage value of the voltage signal from the signal input module 10 before inputting it to the current judgment module 30. This allows the current judgment module 30 to use a lower voltage power supply, avoiding the need for an additional power supply and reducing system complexity and cost.

[0031] Continue to combine Figure 1 In some specific embodiments, the signal processing module 20 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected to the output end of the signal input module 10, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is grounded, and the first end of the second resistor R2 is the output end of the signal processing module 20.

[0032] It should be understood that, at this time, the first end of the first resistor R1 serves as the input terminal of the signal processing module 20, and the first end of the second resistor R2 and the second end of the first resistor R1 simultaneously serve as the output terminals of the signal processing module 20. The first end of the first resistor R1 receives the initial voltage signal, and the second end of the first resistor R1 outputs the target voltage signal. Based on this structure, the first resistor R1 and the second resistor R2 form a voltage divider circuit, such that the voltage value of the target voltage signal finally output by the second end of the first resistor R1 is lower than the voltage value of the initial voltage signal input by the first end of the first resistor R1.

[0033] Figure 2 This is a circuit diagram of another embodiment of the current detection circuit 100 of the motor controller provided in this application.

[0034] Combination Figure 2 In some specific embodiments, the signal processing module 20 further includes a third resistor R3 and a first power supply VCC1. The first end of the third resistor R3 is connected to the first end of the second resistor R2, and the second end of the third resistor R3 is connected to the first power supply VCC1. It should be understood that by setting the third resistor R3 and the first power supply VCC1, a static offset can be provided for the signal processing module 20 to ensure the normal function of the signal processing module 20.

[0035] Based on the above circuit structure, let the initial voltage signal at the input terminal of the signal processing module 20 be Vin, and the target voltage signal at the output terminal of the signal processing module 20 be Va. Then, the circuit analysis formula for the signal processing module 20 is Formula 1:

[0036] (Va-0) / R2=(VCC1-Va) / R3+(Vin-Va) / 1

[0037] If VCC1 uses a common 5V digital power supply, substituting into Formula 1 yields Formula 2:

[0038] (Va-0) / R2=(5-Va) / R3+(Vin-Va) / 1

[0039] If the initial voltage signal has a voltage range of Vin = 0.5V to 4.5V, and the target voltage signal at the output of the signal processing module 20 needs to have a voltage value of Va = 0.5V to 2.5V, then Vin = 2 * Va - 0.5V can be calculated.

[0040] Based on the above, when the initial voltage signal value Vin = 0.5V, the target voltage signal value Va = 0.5V. Substituting these values ​​into Formula 2, we calculate R3 = 9 * R2. When the initial voltage signal value Vin is 2.5V, the target voltage signal value Va should be maintained at 1.5V. Substituting these values ​​into Formula 2, we calculate R1 = 0.9 * R2.

[0041] Therefore, when calculating the relationship between the first resistor R1, the second resistor R2, and the third resistor R3, only one resistor parameter needs to be determined first, and the other two can be calculated. For example, when the second resistor R2 is 3kΩ, the third resistor R3 is 27kΩ, and the first resistor R1 is 2.7kΩ.

[0042] Figure 3 This is a circuit diagram of another embodiment of the current detection circuit 100 of the motor controller provided in this application.

[0043] Combination Figure 3 In some specific embodiments, the signal processing module 20 further includes a first capacitor C1 and a second capacitor C2. The two ends of the first capacitor C1 are respectively connected to the two ends of the first resistor R1, and the two ends of the second capacitor C2 are respectively connected to the two ends of the second resistor R2. The first capacitor C1 and the second capacitor C2 are used to adjust the bandwidth of the signal processing module 20.

[0044] It should be understood that the first capacitor C1 and the second capacitor C2 serve filtering and decoupling functions, thereby enabling the adjustment of the bandwidth of the signal processing module 20. The impedance of the first capacitor C1 and the second capacitor C2 decreases as the frequency increases. For large-capacity capacitors (such as electrolytic capacitors), they can filter out low-frequency ripple (such as power supply fluctuations); for small-capacity capacitors (such as ceramic capacitors), they can filter out high-frequency interference (such as switching power supply noise and RF signal coupling). In some application scenarios, the specific configuration of the first capacitor C1 and the second capacitor C2 can be determined according to actual needs. For example, a 10μF electrolytic capacitor for the first capacitor C1 and a 0.1μF ceramic capacitor for the second capacitor C2 can cover a wide frequency range of filtering.

[0045] Figure 4 This is a circuit diagram of another embodiment of the current detection circuit 100 of the motor controller provided in this application.

[0046] Combination Figure 4 In some specific embodiments, the signal processing module 20 further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3. The two ends of the first capacitor C1 are respectively connected to the two ends of the first resistor R1, the two ends of the second capacitor C2 are respectively connected to the two ends of the second resistor R2, and the two ends of the third capacitor C3 are respectively connected to the two ends of the third resistor R3. The first capacitor C1, the second capacitor C2, and the third capacitor C3 are used to adjust the bandwidth of the signal processing module 20.

[0047] Unlike the above embodiments, the signal processing module 20 is also provided with a third capacitor C3 connected in parallel with the third resistor R3. By setting the third capacitor C3, the bandwidth adjustment capability of the signal processing module 20 can be further enhanced.

[0048] Combination Figures 1-4 In some specific embodiments, the current judgment module 30 includes a first signal comparison module 31, a second signal comparison module 32, a second power supply VCC2, and a third power supply VCC3. The positive input terminal of the first signal comparison module 31 is connected to the second power supply VCC2, and the negative input terminal of the second signal comparison module 32 is connected to the third power supply VCC3. The negative input terminal of the first signal comparison module 31 and the positive input terminal of the second signal comparison module 32 are both connected to the output terminal of the signal processing module 20. The output terminals of the first signal comparison module 31 and the second signal comparison module 32 are used to output judgment signals.

[0049] It should be understood that the first signal comparison module 31 and the second signal comparison module 32 can be two separate signal comparison modules, or they can be two related signal comparison modules. For example, the first signal comparison module 31 and the second signal comparison module 32 can be two modules in the same signal comparator. The signal comparator is used to compare the magnitudes of two input signals (voltage or current) in real time and output high / low levels or digital signals according to a preset threshold. Its core function is to determine whether the signal exceeds the threshold, and it is widely used in signal detection, threshold triggering, analog-to-digital conversion, and other fields. The second power supply VCC2 and the third power supply VCC3 can be the same power supply as the first power supply VCC1, for example, both being 5V DC power supplies.

[0050] Based on this setting, if the initial voltage signal is a sinusoidal AC signal with a voltage of 0.5V to 4.5V, by setting the parameters, when the initial voltage signal exceeds 4.5V, the output terminal of the first signal comparison module 31 outputs a low-level signal to indicate that an overcurrent has occurred; when the initial voltage signal is less than 0.5V, the output terminal of the second signal comparison module 32 outputs a low-level signal to indicate that an overcurrent has occurred.

[0051] Continue to combine Figures 1-4 In some specific embodiments, the current judgment module 30 further includes a fourth resistor R4 and a fifth resistor R5. The first end of the fourth resistor R4 is connected to the second power supply VCC2, the second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is grounded, and the first end of the fifth resistor R5 is connected to the positive input terminal of the first signal comparison module 31. In this case, the fourth resistor R4 and the fifth resistor R5 form a voltage divider circuit, and the voltage input from the second power supply VCC2 is input to the positive input terminal of the first signal comparison module 31 after passing through this voltage divider circuit.

[0052] Furthermore, the current judgment module 30 also includes a sixth resistor R6 and a seventh resistor R7. The first end of the sixth resistor R6 is connected to the third power supply VCC3, the second end of the sixth resistor R6 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is grounded, and the first end of the seventh resistor R7 is connected to the negative input terminal of the second signal comparison module 32. At this time, the sixth resistor R6 and the seventh resistor R7 form a voltage divider circuit, and the voltage input from the third power supply VCC3 is input to the negative input terminal of the second signal comparison module 32 after passing through this voltage divider circuit.

[0053] Continue to combine Figures 1-4 In some specific embodiments, the current judgment module 30 further includes a fourth power supply VCC4, which is connected to the positive power supply terminal of the first signal comparison module 31, and the negative power supply terminal of the first signal comparison module 31 is grounded. The fourth power supply VCC4 can be configured in the same way as the first power supply VCC1, the second power supply VCC2, and the third power supply VCC3.

[0054] Based on the above, and the configuration of the signal processing module 20, the fourth power supply of the current judgment module 30 can use a conventional power supply in the prior art, such as a 5V DC power supply, without the need for an additional power supply, which simplifies the circuit structure and reduces costs.

[0055] A second aspect of this application provides a motor controller, including the current detection circuit 100 of the motor controller in any of the above embodiments.

[0056] A third aspect of this application provides a vehicle including a current detection circuit 100 of the motor controller in any of the above embodiments.

[0057] For details regarding the current detection circuit 100 of the motor controller, please refer to the relevant content of the above embodiments, which will not be repeated here.

[0058] In summary, based on the current detection circuit 100 of the motor controller, the motor controller, and the vehicle provided in this application, the detection circuit includes: a signal input module 10, used to receive the initial voltage signal obtained from the detection of the three-phase current; a signal processing module 20, connected to the signal input module 10 to receive the initial voltage signal and process the initial voltage signal to obtain a target voltage signal, the voltage value of the target voltage signal being less than the voltage value of the initial voltage signal; and a current judgment module 30, connected to the signal processing module 20 to receive the target voltage signal and output a judgment signal based on the target voltage signal, the judgment signal being used to determine whether the three-phase current is overcurrent. Therefore, by setting the signal processing module 20, the voltage value of the voltage signal from the signal input module 10 can be reduced before being input to the current judgment module 30, enabling the current judgment module 30 to use a lower voltage power supply, avoiding the need for an additional power supply, and reducing the complexity and cost of the system.

[0059] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A current detection circuit for a motor controller, characterized in that, include: The signal input module is used to receive the initial voltage signal obtained from the three-phase current detection. A signal processing module is connected to the signal input module to receive the initial voltage signal and process the initial voltage signal to obtain a target voltage signal, wherein the voltage value of the target voltage signal is less than the voltage value of the initial voltage signal. A current judgment module is connected to the signal processing module to receive the target voltage signal and output a judgment signal based on the target voltage signal. The judgment signal is used to determine whether the three-phase current is overcurrent.

2. The current detection circuit according to claim 1, characterized in that, The signal processing module includes a first resistor and a second resistor. The first end of the first resistor is connected to the output end of the signal input module, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, and the first end of the second resistor is the output end of the signal processing module.

3. The current detection circuit according to claim 2, characterized in that, The signal processing module further includes a third resistor and a first power supply. The first end of the third resistor is connected to the first end of the second resistor, and the second end of the third resistor is connected to the first power supply.

4. The current detection circuit according to claim 2, characterized in that, The signal processing module further includes a first capacitor and a second capacitor. The two ends of the first capacitor are respectively connected to the two ends of the first resistor, and the two ends of the second capacitor are respectively connected to the two ends of the second resistor. The first capacitor and the second capacitor are used to adjust the bandwidth of the signal processing module.

5. The current detection circuit according to claim 3, characterized in that, The signal processing module further includes a first capacitor, a second capacitor, and a third capacitor. The two ends of the first capacitor are respectively connected to the two ends of the first resistor, the two ends of the second capacitor are respectively connected to the two ends of the second resistor, and the two ends of the third capacitor are respectively connected to the two ends of the third resistor. The first capacitor, the second capacitor, and the third capacitor are used to adjust the bandwidth of the signal processing module.

6. The current detection circuit according to claim 1, characterized in that, The current judgment module includes a first signal comparison module, a second signal comparison module, a second power supply, and a third power supply. The positive input terminal of the first signal comparison module is connected to the second power supply, and the negative input terminal of the second signal comparison module is connected to the third power supply. Both the negative input terminal of the first signal comparison module and the positive input terminal of the second signal comparison module are connected to the output terminal of the signal processing module. The output terminals of the first signal comparison module and the second signal comparison module are used to output the judgment signal.

7. The current detection circuit according to claim 6, characterized in that, The current judgment module further includes a fourth resistor and a fifth resistor. The first end of the fourth resistor is connected to the second power supply, the second end of the fourth resistor is connected to the first end of the fifth resistor, the second end of the fifth resistor is grounded, and the first end of the fifth resistor is connected to the positive input terminal of the first signal comparison module. The current judgment module further includes a sixth resistor and a seventh resistor. The first end of the sixth resistor is connected to the third power supply, the second end of the sixth resistor is connected to the first end of the seventh resistor, the second end of the seventh resistor is grounded, and the first end of the seventh resistor is connected to the negative input terminal of the second signal comparison module.

8. The current detection circuit according to claim 6, characterized in that, The current determination module further includes a fourth power supply, which is connected to the positive terminal of the power supply of the first signal comparison module, and the negative terminal of the power supply of the first signal comparison module is grounded.

9. A motor controller, characterized in that, Includes the current detection circuit of the motor controller according to any one of claims 1-8.

10. A vehicle, characterized in that, Includes the current detection circuit of the motor controller according to any one of claims 1-8.

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