Communication system with anti-interference capability

Abstract

The utility model discloses a communication system with anti-interference capability, and belongs to the technical field of anti-interference circuits. Comprising a controller, and the controller comprises a communication transceiver; the filter circuit is connected with the communication transceiver and comprises a filter, and the input side of the filter is connected with the communication transceiver; a filter is connected between the first input end and the second input end of the common mode inductor; the first diode is arranged between the first output end and the second output end of the common mode inductor; the sensor is connected with the filter circuit. The technical scheme has the beneficial effects that the interference peak value coupled from a communication line can be effectively reduced, so that circuits and devices behind a controller port are protected, and faults such as communication interruption or signal errors and the like in the communication process are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-interference circuits, in particular to a communication system with anti-interference capability. Background Art

[0002] With the continuous development of intelligent and automated driving technologies, sensors, as a crucial component of intelligent driving, are facing increasing demands for accuracy, reliability, and cost control. Against this backdrop, PSI5 (Peripheral Sensor Interface), a new automotive bus standard for connecting multiple sensors to electronic control units, has been widely adopted as the primary sensor communication bus for airbag and chassis position sensors and related restraint systems.

[0003] In a PSI5 communication system, the controller module connects to the sensor using unshielded twisted-pair cables for power and data transmission. The controller module uses an integrated or separate PSI5 transceiver to provide regulated voltage to the sensor and read the transmitted data. Sensor data is transmitted to the controller using Manchester-encoded current-modulated signals. As with other communication protocols, ensuring that communication is not disrupted by external signals and thus potentially ineffective is a critical concern for both parties. Both the controller-side PSI5 transceiver chip manufacturers and the sensor-side chip manufacturers recommend filtering circuits to enhance communication anti-interference capabilities.

[0004] Conventional technology uses high-current injection and electrostatic tests within electromagnetic compatibility (EMC) testing to simulate communication interference that can occur during real-world vehicle or production processes. For PSI5 communication, which lacks filtering circuitry on the controller's communication port, static electricity or other high-frequency signal interference can affect the PSI5 transceiver's anti-interference capabilities, leading to communication interruptions, frame loss, and even circuit damage in severe cases. Utility Model Content

[0005] The purpose of this utility model is to provide a communication system with anti-interference capability to solve the above technical problems;

[0006] A communication system with anti-interference capability, comprising:

[0007] A controller, the controller comprising:

[0008] Communication transceiver;

[0009] A filter circuit is connected to the communication transceiver, and the filter circuit includes:

[0010] A filter, wherein an input side of the filter is connected to the communication transceiver;

[0011] a common-mode inductor, wherein the filter is connected between a first input terminal and a second input terminal of the common-mode inductor;

[0012] a first diode, the first diode being provided between the first output terminal and the second output terminal of the common-mode inductor;

[0013] The sensor is connected to the filtering circuit.

[0014] Preferably, the filter comprises,

[0015] a first resistor, wherein a first end of the first resistor is connected to the communication transceiver;

[0016] a first capacitor, wherein a first end of the first capacitor is connected to the first end of the first resistor, and a second end of the first capacitor is grounded;

[0017] A second capacitor, wherein a first end of the second capacitor is connected to the second end of the first resistor, and a second end of the second capacitor is grounded.

[0018] Preferably, the second end of the first capacitor is also connected to the second input end of the common-mode inductor.

[0019] Preferably, the first input end of the sensor is connected to the first end of the first diode, and the second input end of the sensor is connected to the second end of the first diode.

[0020] Preferably, the package size of the first resistor is 0.06 inches×0.03 inches, or 0.08 inches×0.05 inches, or 0.12 inches×0.06 inches.

[0021] Preferably, the resistance range of the first resistor is 2Ω to 512Ω.

[0022] Preferably, the package size of the first capacitor and the second capacitor is 0.04 inches×0.02 inches, or 0.06 inches×0.03 inches, or 0.08 inches×0.05 inches.

[0023] Preferably, the capacitance range of the first capacitor and the second capacitor is 1nF to 220nF.

[0024] Preferably, the inductance range of the common-mode inductor at 100KHZ is 11μH to 100μH, and the impedance range of the common-mode inductor at 10MHZ is 300Ω to 5000Ω.

[0025] Preferably, the first diode is a bidirectional TVS diode, the reverse standoff voltage of the first diode is 24V or 27V, and the rated peak pulse current range of the first diode is 2A to 3.5A.

[0026] The beneficial effect of the utility model is that it can effectively reduce the interference peak coupled from the communication line, thereby protecting the circuits and devices behind the controller port and preventing failures such as communication interruption or signal error during the communication process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a circuit diagram of a communication system with anti-interference capability. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0031] A communication system with anti-interference capability, such as Figure 1 Shown, including,

[0032] Controller U, controller U includes,

[0033] Communication transceiver IC;

[0034] The filter circuit FL is connected to the communication transceiver IC. The filter circuit FL includes:

[0035] A filter RC, wherein an input side of the filter RC is connected to a communication transceiver IC;

[0036] A common mode inductor L1, wherein a filter RC is connected between a first input terminal and a second input terminal of the common mode inductor L1;

[0037] A first diode D1 is provided between the first output terminal and the second output terminal of the common mode inductor L1;

[0038] Sensor S is connected to the filter circuit FL.

[0039] Specifically, the utility model provides a communication system with anti-interference capability, in which the communication transceiver IC is a PSI5 transceiver. A filter circuit FL with anti-interference capability is added to the communication port of the communication transceiver IC, effectively reducing the interference peak coupled in from the PSI5 communication line, thereby protecting the circuits and devices after the controller U port, and preventing communication interruption or signal error and other faults from occurring during the PSI5 communication process.

[0040] In a preferred embodiment, the filter RC comprises,

[0041] A first resistor R1, wherein a first end of the first resistor R1 is connected to the communication transceiver IC;

[0042] a first capacitor C1, wherein a first end of the first capacitor C1 is connected to a first end of the first resistor R1, and a second end of the first capacitor C1 is grounded;

[0043] a second capacitor C2, wherein a first end of the second capacitor C2 is connected to the second end of the first resistor R1, and a second end of the second capacitor C2 is grounded;

[0044] The second end of the first capacitor C1 is also connected to the second input end of the common mode inductor L1;

[0045] A first input terminal of the sensor S is connected to a first terminal of the first diode D1 , and a second input terminal of the sensor S is connected to a second terminal of the first diode D1 .

[0046] Specifically, when the sensor S communicates with the controller U, the common-mode inductor L1 can suppress common-mode interference. The first resistor R1, the first capacitor C1, and the second capacitor C2 form an RC low-pass filter. The high-frequency spikes can be filtered out by adjusting the resistance and capacitance parameters of the first resistor R1, the first capacitor C1, and the second capacitor C2.

[0047] Place the first diode D1 and common-mode inductor L1 close to the port, and the first resistor R1, first capacitor C1, and second capacitor C2 closer to the PSI5 transceiver. Adding the first diode D1 to the PSI5 communication port of the communication transceiver IC improves the PSI5 communication port's anti-interference capability.

[0048] In a preferred embodiment, the package size of the first resistor R1 is 0.06 inches×0.03 inches, or 0.08 inches×0.05 inches, or 0.12 inches×0.06 inches;

[0049] The resistance range of the first resistor R1 is 2Ω~512Ω;

[0050] The package size of the first capacitor C1 and the second capacitor C2 is 0.04 inches × 0.02 inches, or 0.06 inches × 0.03 inches, or 0.08 inches × 0.05 inches;

[0051] The capacitance range of the first capacitor C1 and the second capacitor C2 is 1nF to 220nF.

[0052] Specifically, selecting the first resistor R1 within a suitable resistance range can effectively match signal characteristics, reduce signal reflection, and improve data transmission stability.

[0053] The optional capacitance range of the first capacitor C1 and the second capacitor C2 can effectively filter out high-frequency noise, reduce the impact of external interference on the signal, and thus improve the clarity of the signal.

[0054] Reasonable configuration of resistors and capacitors can enhance the system's anti-interference ability, reduce the risk of communication interruption or signal error, and thus improve the reliability of the entire system.

[0055] Resistors and capacitors of varying resistance and capacitance values ​​maintain stable performance across a wide range of operating temperatures and environmental conditions, ensuring system operation in a variety of scenarios. This reduces interference and signal distortion, lowering stress on circuit components and effectively extending the life of components within a communication system.

[0056] In a preferred embodiment, the inductance range of the common-mode inductor L1 at 100 kHz is 11 μH to 100 μH, and the impedance range of the common-mode inductor L1 at 10 MHz is 300Ω to 5000Ω.

[0057] Specifically, within the operating frequency range of 100kHz and 10MHz, common-mode inductor L1 can effectively suppress common-mode noise, reducing the impact of interfering signals on transmission quality. This helps achieve good impedance matching, thereby reducing signal reflections and losses and improving data transmission stability.

[0058] By filtering out unnecessary high-frequency interference, common-mode inductor L1 helps maintain signal integrity and ensure accurate information transmission.

[0059] In a preferred embodiment, the first diode D1 is a bidirectional TVS diode, the reverse standoff voltage of the first diode D1 is 24V or 27V, and the rated peak pulse current range of the first diode D1 is 2A to 3.5A.

[0060] Specifically, when static electricity enters the communication port, the first diode D1 can clamp the pulse peak voltage to prevent static electricity from damaging the PSI5 transceiver. The above port filtering circuit can improve the anti-interference ability of the controller U and ensure normal communication of PSI5.

[0061] In summary, the present application provides a communication system with anti-interference capability and electrostatic protection function, which can effectively reduce the interference peak coupled from the PSI5 communication line, prevent communication interruption or signal error and other faults during the PSI5 communication process, and filter out high-frequency spike interference.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the implementation method and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A communication system with anti-interference capability, characterized in that: include, A controller (U), the controller (U) comprising, Communication transceiver (IC); A filter circuit (FL) is connected to the communication transceiver (IC), and the filter circuit (FL) includes: a filter (RC), wherein an input side of the filter (RC) is connected to the communication transceiver (IC); a common-mode inductor (L1), wherein the filter (RC) is connected between a first input terminal and a second input terminal of the common-mode inductor (L1); a first diode (D1), the first diode (D1) being arranged between the first output end and the second output end of the common mode inductor (L1); The sensor (S) is connected to the filter circuit (FL).

2. The communication system with anti-interference capability according to claim 1, characterized in that: The filter (RC) includes, a first resistor (R1), wherein a first end of the first resistor (R1) is connected to the communication transceiver (IC); a first capacitor (C1), wherein a first end of the first capacitor (C1) is connected to a first end of the first resistor (R1), and a second end of the first capacitor (C1) is grounded; A second capacitor (C2), wherein a first end of the second capacitor (C2) is connected to the second end of the first resistor (R1), and a second end of the second capacitor (C2) is grounded.

3. The communication system with anti-interference capability according to claim 2, characterized in that: The second end of the first capacitor (C1) is also connected to the second input end of the common-mode inductor (L1).

4. The communication system with anti-interference capability according to claim 1, wherein: The first input end of the sensor (S) is connected to the first end of the first diode (D1), and the second input end of the sensor (S) is connected to the second end of the first diode (D1).

5. The communication system with anti-interference capability according to claim 2, characterized in that: The package size of the first resistor (R1) is 0.06 inches×0.03 inches, or 0.08 inches×0.05 inches, or 0.12 inches×0.06 inches.

6. The communication system with anti-interference capability according to claim 2, characterized in that: The resistance range of the first resistor (R1) is 2Ω to 512Ω.

7. The communication system with anti-interference capability according to claim 2, characterized in that: The package size of the first capacitor (C1) and the second capacitor (C2) is 0.04 inches×0.02 inches, or 0.06 inches×0.03 inches, or 0.08 inches×0.05 inches.

8. The communication system with anti-interference capability according to claim 2, characterized in that: The capacitance range of the first capacitor (C1) and the second capacitor (C2) is 1nF to 220nF.

9. The communication system with anti-interference capability according to claim 1, characterized in that: The inductance range of the common-mode inductor (L1) at 100KHZ is 11μH to 100μH, and the impedance range of the common-mode inductor (L1) at 10MHZ is 300Ω to 5000Ω.

10. The communication system with anti-interference capability according to claim 1, characterized in that: The first diode (D1) is a bidirectional TVS diode, the reverse shutdown voltage of the first diode (D1) is 24V or 27V, and the rated peak pulse current range of the first diode (D1) is 2A to 3.5A.

Images