Car window anti-pinch detection circuit and car window anti-pinch control system

Abstract

The utility model relates to a car window anti-pinch detection circuit and a car window anti-pinch control system. The circuit comprises a sampling unit, an amplifying unit, a filtering unit and an integrated operational amplifier unit. The sampling unit is connected with the vehicle window driving motor and the amplifying unit, the filtering unit is connected with the amplifying unit and the vehicle controller, and the filtering unit outputs a first electric signal when the vehicle window driving motor works; the integrated operational amplifier unit is connected with the amplifying unit, the filtering unit and the vehicle controller, and outputs a second electric signal when the vehicle window driving motor works; wherein the first electric signal comprises a direct current component and is used for representing the working state of the vehicle window driving motor; the second electric signal comprises an alternating current ripple component and is used for representing the position of the vehicle window. The circuit can realize effective separation of a direct current component and an alternating current ripple component, and provides signal support for a vehicle controller to realize anti-pinch of a vehicle window.

Description

Technical Field

[0001] This application relates to the field of ripple recognition technology, and in particular to a window anti-pinch detection circuit and a window anti-pinch control system. Background Technology

[0002] With the increasing demands for automotive safety performance, anti-pinch windows have become a widely used passive safety measure. However, existing anti-pinch window control systems typically require a series of complex hardware conversion circuits to process the changing signals from the motor current in order to detect whether a foreign object is being clamped.

[0003] However, while the relevant technologies can achieve basic anti-pinch protection, the system design is relatively complex, which not only increases the failure rate but also raises production costs. Utility Model Content

[0004] Therefore, it is necessary to provide a window anti-pinch detection circuit and a window anti-pinch control system.

[0005] In a first aspect, this application provides a window anti-pinch detection circuit, which includes:

[0006] The sampling unit has an input terminal that is connected to the sampling terminal of the window drive motor.

[0007] An amplification unit, the input of which is connected to the output of the sampling unit;

[0008] The filter unit has its input connected to the output of the amplifier unit, and its output is used to connect to the vehicle controller. The filter unit outputs the first electrical signal when the window drive motor is working.

[0009] The integrated operational amplifier unit has its first input terminal connected to the output terminal of the amplification unit, its second input terminal connected to the output terminal of the filtering unit, and its output terminal used to connect to the vehicle controller. When the window drive motor is working, the integrated operational amplifier unit outputs a second electrical signal.

[0010] The first electrical signal includes a DC component, which is used to characterize the working state of the window drive motor; the second electrical signal includes an AC ripple component, which is used to characterize the position of the window.

[0011] In one embodiment, the filtering unit includes:

[0012] A multi-stage low-pass filter circuit is connected in series between the output of the amplifier unit and the second input of the integrated operational amplifier unit.

[0013] In one embodiment, each stage of the low-pass filter circuit is an RC filter circuit.

[0014] In one embodiment, the integrated operational amplifier unit includes:

[0015] The subtractor has its first input connected to the output of the amplifier unit, its second input connected to the output of the filter unit, and its output connected to the input of the vehicle controller. The first power supply terminal of the subtractor is connected to the power supply, and the second power supply terminal is grounded.

[0016] A positive feedback resistor is used, with its first end connected to the output of the subtractor and its second end connected to the first input of the subtractor.

[0017] The current-limiting resistor has its first end connected to the output of the filter unit and its second end connected to the second input of the subtractor.

[0018] In one embodiment, the sampling unit includes:

[0019] The current sampling resistor has its first end connected to the sampling terminal of the window drive motor and the input terminal of the amplification unit, respectively, and its second end grounded.

[0020] In one embodiment, the amplification unit includes:

[0021] The current sensing amplifier has its first input terminal connected to the output terminal of the sampling unit, its second input terminal grounded, its first power supply terminal connected to the power supply, its second power supply terminal grounded, and its output terminal connected to the input terminal of the filtering unit.

[0022] In one embodiment, the multi-stage low-pass filter includes a first-stage low-pass filter circuit and a second-stage low-pass filter circuit connected in series. The window anti-pinch detection circuit further includes:

[0023] The first lead resistor has its first end connected to the output terminal of the amplification unit, and its second end connected to the first input terminal of the integrated operational amplifier unit.

[0024] And / or,

[0025] The second lead resistor has its first end connected to the output of the first-stage low-pass filter circuit, and its second end connected to the first input of the integrated operational amplifier unit.

[0026] In one embodiment, the window anti-pinch detection circuit further includes:

[0027] The voltage divider unit has its input connected to the output of the integrated operational amplifier unit, and its output is used to connect to the vehicle controller.

[0028] In one embodiment, the voltage divider unit includes:

[0029] The first voltage divider resistor has its first end connected to the power supply and its second end connected to the output of the integrated operational amplifier unit.

[0030] The second voltage divider resistor has its first end connected to the output of the integrated operational amplifier unit and its second end connected to the input of the vehicle controller.

[0031] In one embodiment, where the circuit includes a power supply, the window anti-pinch detection circuit further includes:

[0032] The power supply filter capacitor has its first terminal connected to the power supply and its second terminal grounded.

[0033] Secondly, this application also provides a window anti-pinch control system, which includes:

[0034] Car window drive motor;

[0035] Vehicle controller;

[0036] Such as the anti-pinch detection circuit for car windows in the above embodiments.

[0037] The aforementioned anti-pinch detection circuit and anti-pinch control system for car windows have at least the following beneficial effects:

[0038] By coordinating the sampling unit, amplification unit, filtering unit, and integrated operational amplifier unit, effective separation of the DC and AC ripple components in the window drive motor current is achieved. This not only reduces circuit complexity and potential failure points while ensuring signal integrity, but also provides signal support for the vehicle controller to accurately determine whether the window is in the anti-pinch zone and whether the drive motor is stalled. Furthermore, this circuit helps reduce costs and improves the safety and reliability of the window anti-pinch function. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology 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 these drawings without creative effort.

[0040] Figure 1This is a schematic diagram of the anti-pinch detection circuit for a car window in one embodiment;

[0041] Figure 2 This is a schematic diagram of the anti-pinch detection circuit for the car window in another embodiment. Detailed Implementation

[0042] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0044] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0045] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0046] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0047] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0048] In one exemplary embodiment, such as Figure 1As shown, this application provides a window anti-pinch detection circuit, which includes a sampling unit 2, an amplification unit 4, a filtering unit 6, and an integrated operational amplifier unit 8. The input terminal of the sampling unit 2 is connected to the sampling terminal of the window drive motor 300; the input terminal of the amplification unit 4 is connected to the output terminal of the sampling unit 2; the input terminal of the filtering unit 6 is connected to the output terminal of the amplification unit 4, and the output terminal of the filtering unit 6 is connected to the vehicle controller 500. When the window drive motor 300 is operating, the filtering unit 6 outputs a first electrical signal; the first input terminal of the integrated operational amplifier unit 8 is connected to the output terminal of the amplification unit 4, and the second input terminal of the integrated operational amplifier unit 8 is connected to the output terminal of the filtering unit 6. The output terminal of the integrated operational amplifier unit 8 is connected to the vehicle controller 500, and the integrated operational amplifier unit 8 outputs a second electrical signal when the window drive motor 300 is operating. The first electrical signal includes a DC component, used to characterize the operating state of the window drive motor; the second electrical signal includes an AC ripple component, used to characterize the position of the window.

[0049] The sampling unit 2 monitors the current changes of the window drive motor 300. This can be achieved by connecting a low-resistance resistor to the negative terminal of the motor. When current flows through this resistor, a small voltage drop is generated. This voltage drop is proportional to the current flowing through it, so the current information of the window drive motor 300 can be indirectly obtained by measuring the voltage drop. The amplification unit 4 amplifies the weak voltage signal. Since the voltage drop generated by the sampling resistor is very small, it is insufficient for direct processing or analysis by subsequent circuits. Therefore, the amplification unit 4 needs to amplify the weak voltage signal to a suitable level for further processing. The amplification unit 4 may consist of an amplifier and may also include some peripheral components, such as feedback resistors and capacitors, to adjust the amplifier's gain and other performance parameters. The filtering unit 6 filters the signal amplified by the amplification unit 4, removing unnecessary frequency components (such as AC ripple components) to separate a first electrical signal containing a DC component, which is then output to the vehicle controller 500. This DC component reflects the average operating state of the window drive motor, allowing the vehicle controller 500 to determine whether there is an abnormality (such as stall) in the window drive motor based on the DC component of the first electrical signal. The AC ripple component is related to the internal commutation process of the motor and can be used to determine the real-time position of the window. The integrated operational amplifier unit 8 receives the original electrical signal (i.e., the electrical signal containing both DC and AC ripple components) from the amplification unit 4 and the electrical signal containing the DC component after processing by the filtering unit 6. It subtracts these two signals to separate a pure AC ripple component, which is then output to the vehicle controller 500 as a second electrical signal. This allows the vehicle controller 500 to determine the real-time position of the window and whether it is in the anti-pinch zone.

[0050] For example, when the window drive motor 300 is working, the current of the window drive motor 300 will form a voltage drop at the sampling unit 2. Since the brushes of the window drive motor 300 will continuously commutate when rotating, the current of the window drive motor 300 will generate an AC ripple component during commutation. This will cause the voltage drop formed at the sampling unit 2, i.e., the voltage input to the amplification unit 4, to also have an AC ripple component. Therefore, the voltage output after amplification by the amplification unit 4 contains both DC and AC ripple components. This amplified voltage is directly input to the first input terminal of the integrated operational amplifier unit 8; and input to the filtering unit 6. After filtering by the filtering unit 6, a first electrical signal containing a DC component is output, and this first electrical signal is transmitted to the second input terminal of the integrated operational amplifier unit 8. The integrated operational amplifier unit 8 performs a subtraction operation based on the original electrical signal containing both DC and AC ripple components input from the first input terminal and the DC component input from the second input terminal to obtain and output a second electrical signal containing only the AC ripple component to the vehicle controller 500. Simultaneously, the first electrical signal output by the filter unit 6 is also input to the vehicle controller 500, enabling the vehicle controller 500 to determine the current magnitude based on the DC component of the first electrical signal. This current magnitude is then compared with a pre-stored current threshold in the vehicle controller 500 to determine whether the window drive motor 300 is stalled. Furthermore, the vehicle controller 500 can also calculate based on the pulse group formed by the AC ripple component of the second electrical signal and compare the calculation result with a pre-calibrated pulse-to-window distance mapping dataset stored in the vehicle controller 500 to determine the real-time position of the window and whether it is within the anti-pinch zone. Based on this, the vehicle controller 500 can determine whether the window has encountered an obstacle. When it is determined that the window drive motor 300 is stalled and the window is within the anti-pinch zone, it can be confirmed that the window has encountered an obstacle, such as a person's hand being trapped in the window. The vehicle drive motor can then control the window drive motor 300 to retract a certain distance and stop working, thereby achieving window anti-pinch protection.

[0051] The aforementioned anti-pinch detection circuit for vehicle windows, through the collaboration of the sampling unit, amplification unit, filtering unit, and integrated operational amplifier unit, effectively separates the DC component and AC ripple component in the current of the window drive motor. This not only reduces circuit complexity and potential failure points while ensuring signal integrity, but also provides signal support for the vehicle controller to accurately determine whether the window is in the anti-pinch zone and whether the vehicle drive motor is stalled. Furthermore, this circuit helps reduce costs and improves the safety and reliability of the anti-pinch function.

[0052] In one exemplary embodiment, such as Figure 2As shown, the filter unit 6 includes a multi-stage low-pass filter circuit. The multi-stage low-pass filter circuit is connected in series between the output terminal of the amplifier unit 4 and the second input terminal of the integrated operational amplifier unit 8.

[0053] For example, by setting up a multi-stage low-pass filter circuit, noise and ripple in the electrical signal output from the amplifier unit 4 are filtered out step by step, so that the first electrical signal output from the filter unit 6 retains only the DC component.

[0054] In this embodiment, by setting up a multi-stage low-pass filter circuit, noise and ripple in the output electrical signal of the amplification unit are filtered out step by step, ensuring that the first electrical signal output from the filter unit retains only the DC component. This not only effectively reduces the impact of high-frequency noise and unnecessary AC components on subsequent signal processing, improving the purity and stability of the signal, but also enhances the accuracy and reliability of the system in judging the motor stall condition. In this way, the safety and response accuracy of the entire window anti-pinch mechanism are improved, the risk of misjudgment is reduced, and users are provided with safer and more reliable protection.

[0055] In one exemplary embodiment, each stage of the low-pass filter circuit is an RC filter circuit.

[0056] In this embodiment, each stage of the low-pass filter circuit adopts an RC filter circuit design. This design makes the RC filter circuit simple in structure, low in cost, and easy to implement. It can effectively filter out high-frequency noise and unnecessary AC ripple while retaining the DC component. By using multiple RC filter circuits in series, unwanted high-frequency components can be weakened step by step, ensuring the purity and smoothness of the output signal, thereby improving the accuracy and reliability of the window anti-pinch detection system. In addition, the RC filter circuit has good stability and excellent temperature characteristics, which helps to enhance the stability and anti-interference ability of the entire system, ensuring that the window anti-pinch function can work accurately in various environments.

[0057] In one exemplary embodiment, such as Figure 2 As shown, the integrated operational amplifier unit 8 includes a subtractor U2A, a positive feedback resistor R9, and a current-limiting resistor R7. The first input terminal of the subtractor U2A is connected to the output terminal of the amplifier unit 4, the second input terminal of the subtractor U2A is connected to the output terminal of the filter unit 6, and the output terminal of the subtractor U2A is connected to the input terminal of the vehicle controller 500. The first power supply terminal of the subtractor U2A is used to connect to the power supply, and the second power supply terminal of the subtractor U2A is grounded. The first terminal of the positive feedback resistor R9 is connected to the output terminal of the subtractor U2A, and the second terminal of the positive feedback resistor R9 is connected to the first input terminal of the subtractor U2A. The first terminal of the current-limiting resistor R7 is connected to the output terminal of the filter unit 6, and the second terminal of the current-limiting resistor R7 is connected to the second input terminal of the subtractor U2A.

[0058] The specific connections and functions of the subtractor U2A, positive feedback resistor R9, current limiting resistor R7, and other circuits are readily apparent to those skilled in the art from [the following text is missing from the original] Figure 2 As is known from the above, it will not be elaborated further here. Regarding the specific selection of the aforementioned electronic components, this embodiment is merely illustrative and does not impose any specific limitations.

[0059] For example, the first electrical signal output from the filter unit 6 is input to the subtractor U2A through the second input terminal of the subtractor U2A under the action of the current-limiting resistor R7, while the original electrical signal output from the amplifier unit 4 is input to the subtractor U2A through the first input terminal of the subtractor U2A. After the subtraction operation of the subtractor U2A, the second electrical signal containing only the AC ripple component is separated. The positive feedback resistor R9 provides a positive feedback path to keep the AC ripple component undistorted, and can improve the stability of the circuit and enhance its linearity in response to input changes.

[0060] In this embodiment, the current-limiting resistor ensures the safety and integrity of the input signal, preventing component damage due to overcurrent. The subtractor accurately separates the pure AC ripple component from the composite signal, providing an accurate data basis for subsequent window position determination. The positive feedback resistor, by providing a positive feedback path, not only maintains the AC ripple component without distortion but also enhances the circuit's stability and response linearity. Based on the combined effect of these electronic components, the accuracy and reliability of the window anti-pinch detection system are significantly improved, reducing the risk of misjudgment and thus enhancing the overall system's safety performance. Furthermore, the simple design also helps reduce cost and complexity.

[0061] In one exemplary embodiment, such as Figure 2 As shown, sampling unit 2 includes a current sampling resistor R8. The first end of the current sampling resistor R8 is connected to the sampling terminal of the window drive motor 300 and the input terminal of the amplification unit 4, respectively, and the second end of the current sampling resistor R8 is grounded.

[0062] For example, when the window drive motor 300 is working, the current from its negative terminal flows through the MOTOR_GND and the current sampling resistor R8, forming a voltage drop. Taking a load current of 10A and a resistance of 3mΩ for R8 as an example, the AC component of the current may be ±1A. At this time, the DC component input to the amplifier unit 4 is 10A*3mΩ=30mV. However, since the brushes of the window drive motor 300 are constantly commutating when it rotates, the current of the window drive motor 300 will generate an AC ripple component during commutation. This component will cause the voltage input to the amplifier unit 4 to also have an AC component. Therefore, the 30mV calculated above only represents the DC component of the voltage input to the amplifier unit 4.

[0063] In this embodiment, the AC ripple component and DC component in the current of the window drive motor are effectively sampled by the current sampling resistor. This ensures that the subsequent circuit can simultaneously obtain DC information representing the average working state of the motor and AC ripple information reflecting instantaneous changes, providing a solid foundation for accurate judgment of the window position and the realization of the anti-pinch function.

[0064] In an exemplary embodiment, the amplification unit 4 includes a current sensing amplifier U1. The first input terminal of the current sensing amplifier U1 is connected to the output terminal of the sampling unit 2, the second input terminal of the current sensing amplifier U1 is grounded, the first power supply terminal of the current sensing amplifier U1 is used to connect to a power supply, the second power supply terminal of the current sensing amplifier U1 is grounded, and the output terminal of the current sensing amplifier U1 is connected to the input terminal of the filtering unit 6.

[0065] The connection relationship between the current sensing amplifier U1 and other electronic components is as follows: Figure 2 As shown, it will not be elaborated further here.

[0066] For example, the gain of the current sensing amplifier U1 can be 50V / V. Assuming that the DC component of the voltage input to the current sensing amplifier U1 is 30mV, then after being amplified by the current sensing amplifier U1, the DC component is 30mV*50=1.5V.

[0067] In this embodiment, by using a current-sensing amplifier, the small voltage signal output by the sampling unit is effectively amplified, so that the weak DC component (such as 30mV) generated by the current sampling resistor is amplified into a significant 1.5V DC voltage signal. This not only enables the subsequent filtering unit to process and separate the signal more accurately, but also ensures the synchronous amplification of the AC ripple component and preserves the integrity of the original signal.

[0068] In one exemplary embodiment, such as Figure 2 As shown, the multi-stage low-pass filter includes a first-stage low-pass filter circuit and a second-stage low-pass filter circuit connected in series. The window anti-pinch detection circuit also includes a first drain resistor R1 and / or a second drain resistor R2. The first end of the first drain resistor R1 is connected to the output terminal of the amplification unit 4, and the second end of the first drain resistor R1 is connected to the first input terminal of the integrated operational amplifier unit 8. The second drain resistor R2 has its first end connected to the output terminal of the first-stage low-pass filter circuit, and its second end connected to the first input terminal of the integrated operational amplifier unit 8.

[0069] The first low-pass filter circuit consists of resistor R5 and capacitor C5, and the second low-pass filter circuit consists of resistor R6 and capacitor C4.

[0070] For example, by setting a first-stage low-pass filter circuit to filter out noise in the current ripple, and by setting a second-stage low-pass filter circuit to filter out ripple, the first electrical signal output by the filter unit 6 retains only the DC component of the original signal output by the amplifier unit 4. Secondly, by setting only the first current-carrying resistor R1, the original electrical signal output from the amplifier unit 4 is input to the integrated operational amplifier unit 8 without passing through the first and second-stage low-pass filter circuits. This preserves the AC ripple component as much as possible, preventing the signal from becoming too smooth after passing through multiple low-pass filters, which would result in an overly smooth waveform of the second electrical signal output by the integrated operational amplifier unit 8, leading to calculation errors in the vehicle controller 500. Conversely, if the original signal output by the amplifier unit 4 has excessive noise, only the second current-carrying resistor R2 can be set, allowing the original signal to pass through the first-stage low-pass filter to remove the noise, ensuring the calculation accuracy of the vehicle controller 500.

[0071] In this embodiment, by flexibly configuring the first and second current-draining resistors and combining them with a multi-stage low-pass filter circuit, the signal processing in the window anti-pinch detection circuit is optimized. Specifically, setting only the first current-draining resistor allows the original electrical signal to be directly input to the integrated operational amplifier unit, preserving the AC ripple component as much as possible and avoiding signal distortion and vehicle controller calculation errors caused by excessive filtering. Setting only the second current-draining resistor, on the other hand, removes noise through the first-stage low-pass filter when there is excessive noise, ensuring signal purity and calculation accuracy. This design not only improves the system's adaptability and reliability but also enhances the accuracy of signal processing under different operating conditions, thus providing a strong guarantee for the safe and reliable operation of the window anti-pinch function.

[0072] In one exemplary embodiment, such as Figure 2 As shown, the anti-pinch detection circuit for the car window also includes a voltage divider unit 10. The input terminal of the voltage divider unit 10 is connected to the output terminal of the integrated operational amplifier unit 8, and the output terminal of the voltage divider unit 10 is used to connect to the vehicle controller 500.

[0073] For example, after the second electrical signal output by the integrated operational amplifier unit 8 passes through the voltage divider unit 10, the AC ripple component of the second electrical signal can be converted into a pulse and directly input to the vehicle controller 500, so that the vehicle controller 500 can perform ripple calculation based on the pulse to determine the real-time position of the window.

[0074] In this embodiment, by introducing a voltage divider unit, the AC ripple component in the second electrical signal output by the integrated operational amplifier unit is converted into an easily processed pulse signal and directly input to the vehicle controller. This not only simplifies the signal transmission and processing process and improves the system's response speed and efficiency, but also enables the vehicle controller to perform ripple calculations more accurately based on these pulse signals, thereby accurately determining the real-time position of the window.

[0075] In one exemplary embodiment, such as Figure 2 As shown, the voltage divider unit 10 includes a first voltage divider resistor R3 and a second voltage divider resistor R4. The first end of the first voltage divider resistor R3 is connected to the power supply, and the second end of the first voltage divider resistor R3 is connected to the output terminal of the integrated operational amplifier unit 8; the first end of the second voltage divider resistor R4 is connected to the output terminal of the integrated operational amplifier unit 8, and the second end of the second voltage divider resistor R4 is connected to the input terminal of the vehicle controller 500.

[0076] For example, the specific connection relationship between the first voltage divider resistor R3 and the second voltage divider resistor R4 is as follows: Figure 2 As shown, details will not be repeated here. The first voltage divider resistor R3 connects the power supply to the output of the integrated operational amplifier unit 8, responsible for adjusting the voltage and providing current limiting protection; the second voltage divider resistor R4 connects the output of the integrated operational amplifier unit 8 to the input of the vehicle controller 500, ensuring signal level matching and optimizing impedance, thereby improving the stability and accuracy of signal transmission. Together, these two resistors not only simplify the signal conditioning process and enhance the system's anti-interference capability and reliability, but also enable the vehicle controller 500 to more accurately calculate ripple based on pulses to determine the real-time position of the window, thus improving the performance and safety of the entire anti-pinch system.

[0077] In one exemplary embodiment, such as Figure 2 As shown, in the case of a power supply, the window anti-pinch detection circuit also includes a power supply filter capacitor. The first terminal of the power supply filter capacitor is connected to the power supply, and the second terminal is grounded.

[0078] The power supply filter capacitors can be multiple, and can be selected and matched according to the specific circuit connection and the required filtering accuracy of the power supply. Figure 2 The first power supply filter capacitor C1 and the second power supply filter capacitor C2 are shown in the figure.

[0079] In this embodiment, by introducing multiple power supply filter capacitors, the window anti-pinch detection circuit can effectively filter out noise and fluctuations in the power supply, ensuring that the power supplied to each circuit module is stable and clean.

[0080] In one exemplary embodiment, this application also provides a window anti-pinch control system, which includes a window drive motor 300, a vehicle controller 500, and a window anti-pinch detection circuit as described in the above embodiment.

[0081] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A window pinch detection circuit, comprising: The vehicle window anti-pinch detection circuit comprises: a sampling unit, an input end of the sampling unit being connected to a sampling end of a vehicle window driving motor; an amplification unit, an input end of the amplification unit being connected to an output end of the sampling unit; a filtering unit, an input end of the filtering unit being connected to an output end of the amplification unit, an output end of the filtering unit being connected to a vehicle controller, the filtering unit outputting a first electric signal when the vehicle window driving motor is working; an integrated operational amplifier unit, a first input end of the integrated operational amplifier unit being connected to an output end of the amplification unit, a second input end of the integrated operational amplifier unit being connected to an output end of the filtering unit, an output end of the integrated operational amplifier unit being connected to the vehicle controller, the integrated operational amplifier unit outputting a second electric signal when the vehicle window driving motor is working; wherein the first electric signal comprises a direct current component, and is used to represent a working state of the vehicle window driving motor; and the second electric signal comprises an alternating current ripple component, and is used to represent a position of the vehicle window.

2. The window pinch protection detection circuit of claim 1, wherein, The filtering unit comprises: a multi-stage low-pass filter circuit, the multi-stage low-pass filter circuit being connected in series between the output end of the amplification unit and the second input end of the integrated operational amplifier unit.

3. The window pinch protection detection circuit of claim 2, wherein, Each stage of the low-pass filter circuit is an RC filter circuit.

4. The window pinch protection detection circuit of claim 1, wherein, The integrated operational amplifier unit comprises: a subtracter, a first input end of the subtracter being connected to the output end of the amplification unit, a second input end of the subtracter being connected to the output end of the filtering unit, an output end of the subtracter being connected to an input end of the vehicle controller, a first power supply end of the subtracter being connected to a power supply, a second power supply end of the subtracter being grounded; a positive feedback resistor, a first end of the positive feedback resistor being connected to the output end of the subtracter, a second end of the positive feedback resistor being connected to the first input end of the subtracter; a current-limiting resistor, a first end of the current-limiting resistor being connected to the output end of the filtering unit, a second end of the current-limiting resistor being connected to the second input end of the subtracter.

5. The window pinch protection detection circuit of claim 1, wherein, The sampling unit comprises: a current sampling resistor, a first end of the current sampling resistor being connected to the sampling end of the vehicle window driving motor and the input end of the amplification unit respectively, a second end of the current sampling resistor being grounded.

6. The window pinch protection detection circuit of claim 1, wherein, The amplification unit comprises: a current sensing amplifier, a first input end of the current sensing amplifier being connected to the output end of the sampling unit, a second input end of the current sensing amplifier being grounded, a first power supply end of the current sensing amplifier being connected to a power supply, a second power supply end of the current sensing amplifier being grounded, an output end of the current sensing amplifier being connected to the input end of the filtering unit.

7. The window pinch protection detection circuit of claim 2, wherein, The multi-stage low-pass filter circuit comprises a first-stage low-pass filter circuit and a second-stage low-pass filter circuit connected in series, and the vehicle window anti-pinch detection circuit further comprises: a first current leading resistor, a first end of the first current leading resistor being connected to the output end of the amplification unit, a second end of the first current leading resistor being connected to the first input end of the integrated operational amplifier unit; and / or, ​ A second current leading resistor, a first end of the second current leading resistor is connected with an output end of the first stage low pass filter circuit, and a second end of the second current leading resistor is connected with a first input end of the integrated operational amplifier unit.

8. The window pinch protection detection circuit of claim 1, wherein, The window anti-pinch detection circuit further comprises: A voltage dividing unit, an input end of the voltage dividing unit is connected with an output end of the integrated operational amplifier unit, and an output end of the voltage dividing unit is used for connecting the vehicle controller.

9. The window pinch protection detection circuit of claim 8, wherein, The voltage dividing unit comprises: A first voltage dividing resistor, a first end of the first voltage dividing resistor is used for connecting a power supply, and a second end of the first voltage dividing resistor is connected with an output end of the integrated operational amplifier unit; A second voltage dividing resistor, a first end of the second voltage dividing resistor is connected with the output end of the integrated operational amplifier unit, and a second end of the second voltage dividing resistor is connected with an input end of the vehicle controller.

10. The window pinch protection detection circuit of any of claims 1-9, wherein, In the case that the circuit comprises the power supply, the window anti-pinch detection circuit further comprises: A power supply filter capacitor, a first end of the power supply filter capacitor is connected with the power supply, and a second end of the power supply filter capacitor is grounded.

11. A window pinch control system, characterized by, The window anti-pinch control system comprises: A window driving motor; A vehicle controller; The window anti-pinch detection circuit according to any one of claims 1-10.

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