Vehicle-mounted tuning system and USB data transmission interference suppression circuit

A technology for interference suppression and data transmission, applied in the direction of transmission noise suppression, transmission system, electrical interference reduction, etc., can solve problems such as data corruption, loss or breakdown

Inactive Publication Date: 2019-10-01
广州市车厘子电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the complex electronics and power systems of automobiles, USB is often subject to various degrees of electromagnetic interference when transmitting data, resulting in data damage, lo...

Method used

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  • Vehicle-mounted tuning system and USB data transmission interference suppression circuit
  • Vehicle-mounted tuning system and USB data transmission interference suppression circuit

Examples

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Embodiment 1

[0045] see figure 1 As shown, this embodiment provides a USB data transmission interference suppression circuit connected to the back end of the USB interface 100 . The interference suppression circuit mainly includes a first varistor circuit 101 and an electrostatic discharge protection circuit 102 .

[0046] Wherein, the first varistor circuit 101 is electrically connected between the data interfaces DM and DP of the USB interface and the ground. When the voltage at both ends of the varistor circuit exceeds a predetermined value, generally the predetermined value is set by the user, such as setting It is set to a certain size to indicate that a surge occurs in the current circuit (that is, the transient input energy suddenly rises, and the transient voltage value becomes very large), and the impedance of the first varistor circuit 101 varies with the voltage at both ends of the varistor circuit. Change linearly to clamp the voltage at both ends of the first varistor circuit ...

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Abstract

The invention relates to the field of automotive electronics, and discloses a vehicle-mounted tuning system and a USB data transmission interference suppression circuit. The circuit comprises a firstvoltage-sensitive impedance circuit which is electrically connected between a data interface of a USB interface and the ground, and when the voltage of the voltage-sensitive impedance circuit exceedsa preset value, the impedance of the voltage-sensitive impedance circuit changes nonlinearly along with the voltage at the two ends of the voltage-sensitive impedance circuit, so that the voltage of the voltage-sensitive impedance circuit is clamped on a preset constant voltage; an electrostatic discharge protection circuit which comprises a data input interface and a data output interface which are in circuit conduction with each other, a surge protection circuit is arranged between the data input interface and the data output interface, and the surge protection circuit is used for discharging surge energy to the ground when the absolute value of the voltage of the data input interface and/or the data output interface is greater than a preset voltage value.

Description

technical field [0001] The invention relates to the field of automotive electronics, in particular to the field of vehicle tuning systems, and discloses a vehicle tuning system and a USB data transmission interference suppression circuit. Background technique [0002] There is a system in the car audio refitting market called the car DSP tuning system. The car DSP audio device is connected to the PC tuning software through the USB interface to solve the problem of the original car audio sound positioning, the sound field level is not clear, the treble is not transparent, and the human voice is blurred. Not full, weak mid-frequency and weak bass, these data are transmitted to the car DSP audio equipment through the USB interface to adjust the original car sound effect. [0003] However, in the complex electronics and power systems of automobiles, USB is often subject to various degrees of electromagnetic interference when transmitting data, resulting in data damage, loss or b...

Claims

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Application Information

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IPC IPC(8): H04B15/02H04B15/00
CPCH04B15/00H04B15/02
Inventor 秦先清
Owner 广州市车厘子电子科技有限公司
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