Current sampling circuit, motor control circuit, motor system and brake system

Abstract

The utility model provides a current sampling circuit, a motor control circuit, a motor system and a braking system, and relates to the technical field of circuits, the current sampling circuit comprises a first sampling resistor, a second sampling resistor, a first sampling circuit, a second sampling circuit and a control unit; the first sampling resistor is connected between a first output end of the driving circuit and a first wiring end of the motor, and two ends of the first sampling resistor are connected with an input end of the first sampling circuit; the second sampling resistor is connected between the second output end of the driving circuit and the second wiring end of the motor; two ends of the second sampling resistor are connected with the input end of the second sampling circuit; the output end of the first sampling circuit and the output end of the second sampling circuit are connected with the control unit. The current is collected at the input end or the output end of the motor, so that the sampling current at the input end or the output end of the motor is checked, and the problem that the precision of current collection is affected due to the loss of components in a motor control circuit and the wiring problem of the circuit is avoided.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and in particular to a current sampling circuit, a motor control circuit, a motor system, and a braking system. Background Technology

[0002] With the rapid development of vehicles, the current of the motor control circuit in the vehicle's braking system can be used to reflect the fault status of the braking system. Therefore, the requirement for the sampling accuracy of the current of the motor control circuit in the vehicle's braking system is getting higher and higher.

[0003] Currently, the current sampling method for motor control circuits is mostly single-resistor sampling, which involves connecting a sampling resistor in series on one side of the motor to sample the current.

[0004] However, single-resistor sampling can only obtain the current at one end of the motor, and cannot ensure that the sampled currents at both ends of the motor are equal. Furthermore, due to component losses and wiring issues in the motor control circuit, the current obtained by single-resistor sampling may not be the actual current flowing through the motor control circuit. Therefore, it is impossible to determine whether the current loss is caused by the motor or by other components in the motor control circuit based on the sampled current, and consequently, it is impossible to perform high-precision control of the motor control circuit based on the sampled current. Utility Model Content

[0005] The purpose of this application is to provide a current sampling circuit, a motor control circuit, a motor system, and a braking system, so as to collect current at the input or output end of the motor, verify the sampled current at the input or output end of the motor, and avoid the impact of component losses and circuit wiring problems on the accuracy of current acquisition.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, embodiments of this application provide a current sampling circuit, including: a first sampling resistor, a second sampling resistor, a first sampling circuit, a second sampling circuit, and a control unit;

[0008] The first sampling resistor is connected between the first output terminal of the drive circuit and the first terminal of the motor, and the two ends of the first sampling resistor are also connected to the input terminal of the first sampling circuit; the second sampling resistor is connected between the second output terminal of the drive circuit and the second terminal of the motor, and the two ends of the second sampling resistor are also connected to the input terminal of the second sampling circuit.

[0009] The output terminals of the first sampling circuit and the second sampling circuit are also connected to the control unit.

[0010] Optionally, the first sampling circuit includes: a first differential capacitor and a first sampling amplifier; wherein, the two ends of the first differential capacitor are the input terminals of the first sampling circuit, and are respectively connected to the two ends of the first sampling resistor; the two ends of the first differential capacitor are respectively connected to the two input terminals of the first sampling amplifier; and the output terminal of the first sampling amplifier is the output terminal of the first sampling circuit.

[0011] The second sampling circuit includes a second differential capacitor and a second sampling amplifier; wherein, the two ends of the second differential capacitor are the input terminals of the second sampling circuit, and are respectively connected to the two ends of the second sampling resistor; the two ends of the second differential capacitor are respectively connected to the two input terminals of the second sampling amplifier; and the output terminal of the second sampling amplifier is the output terminal of the second sampling circuit.

[0012] Optionally, the first sampling circuit further includes a first matching network, wherein the two ends of the first differential capacitor are connected to the two input terminals of the first sampling amplifier through the first matching network.

[0013] Optionally, the second sampling circuit further includes a second matching network, wherein the two ends of the second differential capacitor are connected to the two input terminals of the second sampling amplifier through the second matching network.

[0014] Optionally, the first matching network includes a first matching resistor and a second matching resistor, wherein the two ends of the first differential capacitor are respectively connected to the two input terminals of the first sampling amplifier through the first matching resistor and the second matching resistor.

[0015] Optionally, the second matching network includes a third matching resistor and a fourth matching resistor, and the two ends of the second differential capacitor are respectively connected to the two input terminals of the second sampling amplifier through the third matching resistor and the fourth matching resistor.

[0016] Secondly, embodiments of this application provide a motor control circuit, including: a drive circuit and a current sampling circuit as described in any of the first aspects above;

[0017] The input terminal of the drive circuit is used to connect to a preset power supply, the control terminal of the drive circuit is connected to the control unit in the current sampling circuit, the first output terminal and the second output terminal of the drive circuit are respectively connected to one end of the first sampling resistor and one end of the second sampling resistor in the current sampling circuit, and the other end of the first sampling resistor and the other end of the second sampling resistor are respectively used to connect to the first terminal and the second terminal of the motor to control the motor to rotate forward or in reverse.

[0018] Optionally, the driving circuit is an H-bridge driving circuit.

[0019] Thirdly, embodiments of this application provide a motor system, including: a motor and the motor control circuit described in the second aspect, wherein a first terminal and a second terminal of the motor are respectively connected to the other end of a first sampling resistor and the other end of a second sampling resistor in a current sampling circuit of the motor control circuit.

[0020] Fourthly, embodiments of this application provide a braking system, which includes at least the motor system described in the third aspect above.

[0021] The beneficial effects of the current sampling circuit, motor control circuit, motor system, and braking system provided in this application are:

[0022] This application provides a current sampling circuit, a motor control circuit, a motor system, and a braking system. The current sampling circuit can be composed of a first sampling resistor, a second sampling resistor, a first sampling circuit, a second sampling circuit, and a control unit. The first sampling resistor is connected between the first output terminal of the drive circuit and the first terminal of the motor, and its two ends are also connected to the input terminal of the first sampling circuit for collecting the current at the first terminal of the motor. The second sampling resistor is connected between the second output terminal of the drive circuit and the second terminal of the motor, and its two ends are also connected to the input terminal of the second sampling circuit for collecting the current at the second terminal of the motor. The output terminals of the first and second sampling circuits are also connected to the control unit for verifying the sampled currents in the first and second sampling circuits. This avoids issues caused by circuit wiring and component losses in the braking system affecting the accuracy of current acquisition, preventing the sampled current from being the actual current at the motor input or output terminal, thus hindering high-precision current control and reducing the reliability of the braking system. Therefore, this application can achieve accurate sampling and verification of the current at the motor input or output by connecting a sampling resistor at the motor input or output end respectively, thereby improving the accuracy of the sampling current and the reliability of the braking system. Attached Figure Description

[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 This is a schematic diagram of the structure of a braking system provided in an embodiment of this application;

[0025] Figure 2This is a schematic diagram of the structure of a motor control system provided in an embodiment of this application;

[0026] Figure 3 A schematic diagram of the structure of a motor control circuit provided in this application embodiment. Figure 1 ;

[0027] Figure 4 A schematic diagram of the structure of a motor control circuit provided in this application embodiment. Figure 2 ;

[0028] Figure 5 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 1 ;

[0029] Figure 6 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 2 ;

[0030] Figure 7 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 3 ;

[0031] Figure 8 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 4 ;

[0032] Figure 9 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 5 ;

[0033] Figure 10 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 6 . Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0036] 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.

[0037] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] To better understand the solutions provided in the embodiments of this application, the following detailed description of a current sampling circuit, a motor control circuit, a motor system, and a braking system provided in the embodiments of this application will be provided in conjunction with the accompanying drawings.

[0042] Figure 1 This is a schematic diagram of a braking system provided in an embodiment of this application. Figure 1 As shown, the braking system 400 may include at least: a motor control system 300.

[0043] The braking system 400 can be used to slow down or even stop a moving vehicle, maintain a stable speed for a vehicle traveling downhill, or keep a stopped vehicle stationary. The motor control system 300 is used to control the operation of the motor, realizing various complex motion control and process control.

[0044] The braking system provided in this application can be composed of at least a motor control system. The motor control system in the braking system is used to control the motor to decelerate or even stop the vehicle in motion, or to keep the speed of the vehicle traveling downhill stable, or to keep the vehicle stationary, thereby ensuring the stability of the vehicle and improving the safety and reliability of the vehicle.

[0045] Furthermore, this application also provides a schematic diagram of a motor control system. Figure 2 This is a schematic diagram of a motor control system provided in an embodiment of this application. Figure 2 As shown, the motor control system 300 may include a motor and a motor control circuit 200.

[0046] The first and second terminals of the motor are respectively connected to the other end of the first sampling resistor R1 and the other end of the second sampling resistor R2 in the current sampling circuit 100 of the motor control circuit 200. This is used to sample the current flowing through the first and second terminals of the motor through the first sampling resistor R1 and the second sampling resistor R2 in the current sampling circuit, so as to achieve high-precision current sampling at the input or output terminal of the motor.

[0047] The motor control system provided in this application can be composed of a motor and a motor control circuit. The first and second terminals of the motor are respectively connected to the current sampling circuit in the motor control circuit to sample the current signal at the input or output terminal of the motor. This avoids inaccurate sampling of the current flowing through the motor due to circuit wiring and component losses, thereby improving the reliability of the motor control system.

[0048] Furthermore, this application also provides a schematic diagram of a motor control circuit. Figure 3 A schematic diagram of the structure of a motor control circuit provided in this application embodiment. Figure 1 .like Figure 3 As shown, the motor control circuit 200 may include a drive circuit 210 and a current sampling circuit 100.

[0049] The input terminal of the drive circuit 210 is connected to a preset power supply UB_Motor to provide an electrical signal for operation. The preset power supply UB_Motor can be selected according to actual conditions. The control terminal of the drive circuit 210 is connected to the control unit MCU in the current sampling circuit 100 to receive drive output control from the control unit MCU. The first and second output terminals of the drive circuit 210 are respectively connected to one end of the first sampling resistor R1 and one end of the second sampling resistor R2 in the current sampling circuit 100. The other end of the first sampling resistor R1 and the other end of the second sampling resistor R2 are respectively connected to the first and second terminals of the motor MOTOR to control the motor MOTOR to rotate forward or in reverse.

[0050] The motor control circuit provided in this application can be composed of a drive circuit and a current sampling circuit. The input terminal of the drive circuit is used to connect to a preset power supply to provide a driving electrical signal to the drive circuit. The control terminal of the drive circuit is connected to the control unit in the current sampling circuit. The first and second output terminals of the drive circuit are respectively connected to one end of the first and second sampling resistors in the current sampling circuit. The other ends of the first and second sampling resistors are respectively used to connect to the first and second terminals of the motor to control the motor to rotate forward or in reverse. Thus, the motor control circuit in this application uses the first and second sampling resistors to connect to the first and second terminals of the motor to realize the forward or reverse operation of the motor, thereby ensuring the stability and reliability of the motor control circuit.

[0051] Optionally, in one possible implementation, the drive circuit 210 can be an H-bridge drive circuit. The H-bridge drive circuit can be used to drive load circuits such as motors to achieve functions such as forward rotation, reverse rotation, and braking.

[0052] For example, Figure 4 A schematic diagram of the structure of a motor control circuit provided in this application embodiment. Figure 2 .like Figure 4 As shown, the driving circuit 210 is an H-bridge driving circuit, which can be composed of four N-type MOS transistors (e.g., Figure 4 The H-bridge driver circuit is composed of Q1, Q2, Q3, and Q4. The input terminals of the H-bridge driver circuit are the drains of Q1 and Q2. The drains of Q1 and Q2 are used to connect to the preset power supply UB_Motor.

[0053] The control terminals of the H-bridge driver circuit are the gates of Q1, Q2, Q3, and Q4. These gates are used to connect to the control unit MCU in the current sampling circuit 100. The first output terminal of the H-bridge driver circuit is either the source of Q1 or the drain of Q3 (e.g., ...). Figure 3①), and the source of Q1 is connected to the drain of Q3. The source of Q1 is also connected to one end of the first sampling resistor R1 in the current sampling circuit 100. The other end of the first sampling resistor R1 is used to connect to the first terminal of the motor; the second output terminal of the H-bridge drive circuit is the source of Q2 or the drain of Q4 (e.g., Figure 3 In step ②), the source of Q2 is connected to the drain of Q4, and the source of Q2 is also connected to one end of the second sampling resistor R2 in the current sampling circuit 100. The other end of the second sampling resistor R2 is used to connect to the second terminal of the motor MOTOR to control the motor MOTOR to rotate forward or reverse.

[0054] When the motor is activated, it can be considered to be running in the forward direction according to the preset current direction of power supply UB_Motor---Q1---first sampling resistor R1---motor---sampling resistor R2---Q4---GND; and it can be considered to be running in the reverse direction according to the preset current direction of power supply UB_Motor---Q2---second sampling resistor R2---motor---first sampling resistor R1---Q3---GND.

[0055] It should be noted that the above embodiments of rotating the motor forward or backward are merely one embodiment shown in this application and should not be construed as limiting this application.

[0056] The motor control circuit provided in this application uses an H-bridge drive circuit. Therefore, the motor control circuit in this application is used to connect a first sampling resistor and a second sampling resistor to the first and second terminals of the motor to realize the forward or reverse operation of the motor, thereby ensuring the stability and reliability of the motor control circuit.

[0057] The current sampling circuit provided in the embodiments of this application will be further illustrated below with reference to the accompanying drawings. Figure 5 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 1 .like Figure 5 As shown, the current sampling circuit 100 may include: a first sampling resistor R1, a second sampling resistor R2, a first sampling circuit 110, a second sampling circuit 120, and a control unit MCU.

[0058] The first sampling resistor R1 is connected between the first output terminal of the drive circuit 210 and the first terminal of the motor. The two ends of the first sampling resistor R1 are also connected to the input terminal of the first sampling circuit 110, which is used to collect the electrical signal of the first terminal of the motor. The second sampling resistor R2 is connected between the second output terminal of the drive circuit 210 and the second terminal of the motor. The two ends of the second sampling resistor R2 are also connected to the input terminal of the second sampling circuit 120, which is used to collect the electrical signal of the second terminal of the motor. The output terminals of the first sampling circuit 110 and the second sampling circuit 120 are also connected to the control unit MCU, which is used to transmit the data sampled by the first sampling circuit 110 and the second sampling circuit 120 to the control unit MCU for processing.

[0059] For example, when the motor is running, the first sampling circuit 110 and the second sampling circuit 120 at both ends of the motor are used to sample the electrical signals (such as voltages) of the first sampling resistor R1 and the second sampling resistor R2, respectively, to obtain the first sampling voltage U1 and the second sampling voltage U2. The control unit MCU is used to receive the first sampling voltage U1 and the second sampling voltage U2, and to obtain the first sampling current I1 and the second sampling current I2 based on Ohm's law (such as I = U / R). Then, based on the calculated first sampling current I1 and the second sampling current I2, as well as the first amplification factor N1 and the second amplification factor N2 of the first sampling circuit 110 and the second sampling circuit 120, the voltage difference ΔU between the first terminal and the second terminal of the motor is obtained using the following formula (1).

[0060] ΔU=I1*R1*N1-I2*R2*N2 Formula (1)

[0061] Therefore, the control unit MCU can be used to determine the voltage difference ΔU obtained from the above formula (1). Δ Is the preset voltage difference between the first and second terminals of the motor (U) stored in the control unit (MCU) the same as that between U and the MCU? Δ If the voltage difference between U and the preset voltage value is different, it means that the first sampling current I1 and the second sampling current I2 are not equal. This means the sampling current at the motor input or output is different, indicating that the sampling current is not the actual current flowing into or out of the motor input or output. Therefore, to ensure accurate feedback of braking system faults, the sampling current at the motor input or output needs to be precisely calibrated to ensure they are the same. Thus, the control unit MCU can also use this voltage difference... ΔU controls the control terminal of the drive circuit, that is, by adjusting the duty cycle of the PWM signal output by the drive circuit, the drive circuit is controlled (e.g., ...). Figure 4 The on-time ratio of Q1, Q2, Q3, and Q4 in the sampling resistor (i.e., the duty cycle) is crucial. A larger duty cycle means a longer on-time for the N-type MOSFET, resulting in a larger current flowing through the sampling resistor; conversely, a smaller duty cycle means a shorter on-time for the N-type MOSFET, resulting in a smaller current flowing through the sampling resistor. This ensures that the sampling current at the motor motor input or output is the same. If the sampling current at the motor motor input or output is the same, the fault condition of the braking system, such as severe current loss, can be reflected. If the sampling current at the motor motor input or output is different, due to circuit routing and component losses, it is impossible to accurately determine the cause of the braking system fault. Therefore, it is necessary to verify the sampling current at the motor motor input or output to ensure they are the same. This allows for high-precision control of the motor control circuit based on the sampling current, revealing the specific influencing factors leading to braking system faults.

[0062] It should be noted that the resistance values ​​of the first sampling resistor R1 and the second sampling resistor R2 can be equal or unequal, depending on whether the sampling current at the input or output terminal of the motor is the same. Furthermore, it should be noted that the above-described scheme for sampling the current at the input or output terminal of the motor is applicable, but not limited to sampling circuits containing H-bridge drive circuits or motors with high and low sides; these limitations are not specified here.

[0063] This application provides a current sampling circuit, which can be composed of a first sampling resistor, a second sampling resistor, a first sampling circuit, a second sampling circuit, and a control unit. The first sampling resistor is connected between the first output terminal of the drive circuit and the first terminal of the motor, and its two ends are also connected to the input terminal of the first sampling circuit, used to collect the current at the first terminal of the motor. The second sampling resistor is connected between the second output terminal of the drive circuit and the second terminal of the motor, and its two ends are also connected to the input terminal of the second sampling circuit, used to collect the current at the second terminal of the motor. The output terminals of the first and second sampling circuits are also connected to the control unit, used to verify the sampled current in the first and second sampling circuits. This avoids the problem of circuit wiring and component losses in the braking system affecting the accuracy of current acquisition, resulting in the sampled current not being the actual current at the motor input or output terminal, thus failing to achieve the high-precision current control requirements based on the sampled current and reducing the reliability of the braking system. Therefore, this application can achieve accurate sampling and verification of the current at the motor input or output terminal by connecting a sampling resistor at each of the motor input or output terminals, improving the accuracy of the sampled current and the reliability of the braking system.

[0064] The current sampling circuit provided in the embodiments of this application will be further illustrated below with reference to the accompanying drawings. Figure 6 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 2 .like Figure 6 As shown, the first sampling circuit 110 may include a first differential capacitor C1 and a first sampling amplifier OP1.

[0065] The two ends of the first differential capacitor C1 are the input terminals of the first sampling circuit 110, which are used to connect to the two ends of the first sampling resistor R1 respectively. The two ends of the first differential capacitor C1 are connected to the two input terminals of the first sampling amplifier OP1 respectively. The output terminal of the first sampling amplifier OP1 is the output terminal of the first sampling circuit 110, which is used to amplify the electrical signal of the first sampling resistor R1 for subsequent processing.

[0066] The second sampling circuit 120 may include a second differential capacitor C2 and a second sampling amplifier OP2.

[0067] The two ends of the second differential capacitor C2 are the input terminals of the second sampling circuit 120, which are used to connect to the two ends of the second sampling resistor R2 respectively. The two ends of the second differential capacitor C2 are connected to the two input terminals of the second sampling amplifier OP2 respectively. The output terminal of the second sampling amplifier OP2 is the output terminal of the second sampling circuit 120, which is used to amplify the electrical signal of the second sampling resistor R2 for subsequent processing.

[0068] The first differential capacitor C1 and the second differential capacitor C2 can both be used for filtering and stabilizing the sampling circuit. The first sampling amplifier OP1 and the second sampling amplifier OP2 can both be used for amplifying the sampled signal.

[0069] The current sampling circuit provided in this application includes a first sampling circuit composed of a first differential capacitor and a first sampling amplifier. The two ends of the first differential capacitor are the input terminals of the first sampling circuit, respectively connected to the two ends of a first sampling resistor. The two ends of the first differential capacitor are respectively connected to the two input terminals of the first sampling amplifier. The output terminal of the first sampling amplifier is the output terminal of the first sampling circuit, used to amplify the electrical signal from the first sampling resistor for subsequent processing. The second sampling circuit is composed of a second differential capacitor and a second sampling amplifier. The two ends of the second differential capacitor are the input terminals of the second sampling circuit, respectively connected to the two ends of a second sampling resistor. The two ends of the second differential capacitor are respectively connected to the two input terminals of the second sampling amplifier. The output terminal of the second sampling amplifier is the output terminal of the second sampling circuit, used to amplify the electrical signal from the second sampling resistor for subsequent processing. This enables current sampling at the input or output terminal of a motor.

[0070] The current sampling circuit provided in the embodiments of this application will be further illustrated below with reference to the accompanying drawings. Figure 7 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 3 .like Figure 7 As shown, the first sampling circuit 110 may further include a first matching network 111.

[0071] The two ends of the first differential capacitor C1 are connected to the two input terminals of the first sampling amplifier OP1 through the first matching network 111. This is used to reduce the distortion and noise of the first sampling signal during transmission, ensure the integrity and stability of the first sampling signal, and at the same time, it can also be used to achieve impedance matching, prevent the reflection of the first sampling signal and the formation of standing waves, thereby improving transmission efficiency and signal quality.

[0072] The current sampling circuit provided in this application may further be composed of a first matching network. The two ends of the first differential capacitor are connected to the two input terminals of the first sampling amplifier through the first matching network. This is used to reduce the distortion and noise of the first sampling signal during transmission, ensure the integrity and stability of the first sampling signal, and also to achieve impedance matching, prevent the reflection of the first sampling signal and the formation of standing waves, thereby improving transmission efficiency and signal quality.

[0073] The current sampling circuit provided in the embodiments of this application will be further illustrated below with reference to the accompanying drawings. Figure 8 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 4 .like Figure 8 As shown, the second sampling circuit 120 may further include a second matching network 122.

[0074] The two ends of the second differential capacitor C2 are connected to the two input terminals of the second sampling amplifier OP2 through the second matching network 122. This is used to reduce the distortion and noise of the second sampling signal during transmission, ensure the integrity and stability of the second sampling signal, and at the same time, it can also be used to achieve impedance matching, prevent the reflection of the second sampling signal and the formation of standing waves, thereby improving transmission efficiency and signal quality.

[0075] The current sampling circuit provided in this application further includes a second sampling circuit: a second matching network. The two ends of the second differential capacitor are connected to the two input terminals of the second sampling amplifier through the second matching network. This network is used to reduce the distortion and noise of the second sampling signal during transmission, ensure the integrity and stability of the second sampling signal, and also to achieve impedance matching, prevent the reflection of the second sampling signal and the formation of standing waves, thereby improving transmission efficiency and signal quality.

[0076] The current sampling circuit provided in the embodiments of this application will be further illustrated below with reference to the accompanying drawings. Figure 9 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 5 .like Figure 9 As shown, the first matching network 111 may include: a first matching resistor R3 and a second matching resistor R4.

[0077] The two ends of the first differential capacitor C1 are connected to the two input terminals of the first sampling amplifier OP1 through the first matching resistor R3 and the second matching resistor R4, respectively. The first matching resistor R3 and the second matching resistor R4 reduce the distortion and noise of the first sampling signal during transmission, ensuring the integrity and stability of the first sampling signal. At the same time, they can also be used to achieve impedance matching, prevent the reflection of the first sampling signal and the formation of standing waves, thereby improving transmission efficiency and signal quality.

[0078] It should be noted that the relationship between the values ​​of the first matching resistor R3 and the second matching resistor R4 depends on the first amplification factor N1 of the first sampling amplifier OP1, and is not limited here.

[0079] The current sampling circuit provided in this application includes a first matching network composed of a first matching resistor and a second matching resistor. The two ends of the first differential capacitor are connected to the two input terminals of the first sampling amplifier through the first matching resistor and the second matching resistor, respectively. This reduces the distortion and noise of the first sampling signal during transmission through the first matching resistor and the second matching resistor, ensuring the integrity and stability of the first sampling signal. At the same time, it can also be used to achieve impedance matching, prevent the reflection of the first sampling signal and the formation of standing waves, thereby improving transmission efficiency and signal quality.

[0080] The current sampling circuit provided in the embodiments of this application will be further illustrated below with reference to the accompanying drawings. Figure 10 A schematic diagram of a current sampling circuit provided in this application embodiment. Figure 6 .like Figure 10 As shown, the second matching network 122 may include a third matching resistor R5 and a fourth matching resistor R6.

[0081] The two ends of the second differential capacitor C2 are connected to the two input terminals of the second sampling amplifier OP2 through the third matching resistor R5 and the fourth matching resistor R6, respectively. The third matching resistor R5 and the fourth matching resistor R6 reduce the distortion and noise of the second sampling signal during transmission, ensuring the integrity and stability of the second sampling signal. At the same time, they can also be used to achieve impedance matching, prevent the reflection of the second sampling signal and the formation of standing waves, thereby improving transmission efficiency and signal quality.

[0082] It should be noted that the relationship between the values ​​of the third matching resistor R5 and the fourth matching resistor R6 depends on the second amplification factor N2 of the second sampling amplifier OP2, which is not limited here.

[0083] The current sampling circuit provided in this application includes a second matching network comprising a third matching resistor and a fourth matching resistor. The two ends of the second differential capacitor are respectively connected to the two input terminals of the second sampling amplifier through the third matching resistor and the fourth matching resistor. This reduces the distortion and noise of the second sampling signal during transmission through the third matching resistor and the fourth matching resistor, ensuring the integrity and stability of the second sampling signal. At the same time, it can also be used to achieve impedance matching, prevent the reflection of the second sampling signal and the formation of standing waves, thereby improving transmission efficiency and signal quality.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A current sampling circuit, characterized in that, include: The system comprises a first sampling resistor, a second sampling resistor, a first sampling circuit, a second sampling circuit, and a control unit. The first sampling resistor is connected between the first output terminal of the drive circuit and the first terminal of the motor, and the two ends of the first sampling resistor are also connected to the input terminal of the first sampling circuit; the second sampling resistor is connected between the second output terminal of the drive circuit and the second terminal of the motor, and the two ends of the second sampling resistor are also connected to the input terminal of the second sampling circuit. The output terminals of the first sampling circuit and the second sampling circuit are also connected to the control unit.

2. The current sampling circuit according to claim 1, characterized in that, The first sampling circuit includes: a first differential capacitor and a first sampling amplifier; wherein, the two ends of the first differential capacitor are the input terminals of the first sampling circuit, and are respectively connected to the two ends of the first sampling resistor; the two ends of the first differential capacitor are respectively connected to the two input terminals of the first sampling amplifier; and the output terminal of the first sampling amplifier is the output terminal of the first sampling circuit. The second sampling circuit includes a second differential capacitor and a second sampling amplifier; wherein, the two ends of the second differential capacitor are the input terminals of the second sampling circuit, and are respectively connected to the two ends of the second sampling resistor; the two ends of the second differential capacitor are respectively connected to the two input terminals of the second sampling amplifier; and the output terminal of the second sampling amplifier is the output terminal of the second sampling circuit.

3. The current sampling circuit according to claim 2, characterized in that, The first sampling circuit further includes a first matching network, wherein the two ends of the first differential capacitor are connected to the two input terminals of the first sampling amplifier through the first matching network.

4. The current sampling circuit according to claim 2, characterized in that, The second sampling circuit further includes a second matching network, wherein the two ends of the second differential capacitor are connected to the two input terminals of the second sampling amplifier through the second matching network.

5. The current sampling circuit according to claim 3, characterized in that, The first matching network includes a first matching resistor and a second matching resistor, and the two ends of the first differential capacitor are respectively connected to the two input terminals of the first sampling amplifier through the first matching resistor and the second matching resistor.

6. The current sampling circuit according to claim 4, characterized in that, The second matching network includes a third matching resistor and a fourth matching resistor. The two ends of the second differential capacitor are respectively connected to the two input terminals of the second sampling amplifier through the third matching resistor and the fourth matching resistor.

7. A motor control circuit, characterized in that, include: The driving circuit and the current sampling circuit according to any one of claims 1 to 6; The input terminal of the drive circuit is used to connect to a preset power supply, the control terminal of the drive circuit is connected to the control unit in the current sampling circuit, the first output terminal and the second output terminal of the drive circuit are respectively connected to one end of the first sampling resistor and one end of the second sampling resistor in the current sampling circuit, and the other end of the first sampling resistor and the other end of the second sampling resistor are respectively used to connect to the first terminal and the second terminal of the motor to control the motor to rotate forward or in reverse.

8. The motor control circuit according to claim 7, characterized in that, The driving circuit is an H-bridge driving circuit.

9. A motor system, characterized in that, include: The motor and the motor control circuit according to claim 7 or 8, wherein the first terminal and the second terminal of the motor are respectively connected to the other end of the first sampling resistor and the other end of the second sampling resistor in the current sampling circuit of the motor control circuit.

10. A braking system, characterized in that, At least including: The motor system described in claim 9 above.

Images