CN210693886U

CN210693886U - Vehicle event data recorder gets electric circuit based on LIN bus

Info

Publication number: CN210693886U
Application number: CN201922113128.XU
Authority: CN
Inventors: 李洋; 王羽丹; 桑学文
Original assignee: Changchun Zhongding Technology Co ltd
Current assignee: Changchun Zhongding Technology Co ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-06-05
Anticipated expiration: 2029-12-02

Abstract

The utility model discloses a vehicle event data recorder gets electric circuit based on LIN bus, its characterized in that: the LIN signal acquisition circuit comprises an LIN signal acquisition circuit, a filter circuit, a combined switch driving circuit and a safety switch; the LIN signal acquisition circuit, the filter circuit and the combined switch driving circuit are connected in series; the LIN signal acquisition circuit comprises a capacitor C3; the filter circuit is an RC filter circuit consisting of a resistor R6 and a capacitor C5; the combined switch driving circuit comprises resistors R7, R9, R3 and R4 and MOS transistors Q1 and Q2, and the fuse switch comprises a resistor R1 and a fuse F. The effect is as follows: the automobile data recorder can be dormant and awakened by using a single detection signal, power consumption loss of the automobile data recorder to a power supply is reduced, the utilization rate of the automobile data recorder is improved, cost is reduced, and the automobile data recorder is convenient to install.

Description

Vehicle event data recorder gets electric circuit based on LIN bus

Technical Field

The utility model relates to an automotive electronics field, concretely relates to vehicle event data recorder gets electric circuit based on LIN bus.

Background

At present, the electronic industry is rapidly developed, the types of the automobile data recorder devices are various, the requirements on a power supply system and the power consumption of a power supply source are higher and higher, more and more devices with dormancy and awakening functions are selected by users, the use technologies and the use costs of the devices with dormancy and awakening functions are different, and under the environment, the devices with simple structures and low cost are more and more competitive. Most of the devices on the market work for a long time of 24 hours, storage battery feed is easy to generate, and most of the devices which are in dormancy and awakening are complex in structure and difficult to install.

Disclosure of Invention

In order to solve the problem, the utility model provides an electric circuit is got to vehicle event data recorder based on LIN bus should get electric circuit and solve vehicle event data recorder's consumption problem, decides vehicle event data recorder's dormancy and start through LIN bus signal control.

In order to achieve the above object, the present invention adopts the following specific technical solutions:

a vehicle event data recorder gets electric circuit based on LIN bus, its key lies in: the automobile data recorder power supply circuit based on the LIN bus comprises an LIN signal acquisition circuit, a filter circuit and a combined switch driving circuit; the LIN signal acquisition circuit, the filter circuit and the combined switch driving circuit are connected in series; the LIN signal acquisition circuit comprises a capacitor C3; the filter circuit is an RC filter circuit consisting of a resistor R6 and a capacitor C5; the combined switch driving circuit comprises resistors R7, R9, R3 and R4 and MOS transistors Q1 and Q2.

Optionally, the LIN signal acquisition circuit further includes a resistor R8 and a diode D3, and the resistor R8 and the diode D3 are connected in series as a discharge circuit of the capacitor C3.

Optionally, the filter circuit further comprises a diode D2, and the diode D2 is used for preventing the capacitor C5 from discharging reversely.

Optionally, the combined switch driving circuit further includes a resistor R5 and a capacitor C4, the resistor R5 is connected in series with the capacitor C4, the resistor R5 is connected to the drain of the MOS transistor Q2, and the capacitor C4 is grounded, so as to prolong the turn-off time of the MOS transistor Q2.

Optionally, a safety switch formed by connecting a resistor R1 and a fuse F in parallel is arranged at the power input end.

Optionally, the power taking circuit comprises a diode D for preventing voltage reversal.

Optionally, the power taking circuit includes capacitors C1 and C2, and functions as power supply filtering.

Optionally, a resistor R2 is provided at the voltage output end, and the resistor R2 is a current limiting resistor and functions to protect the automobile data recorder.

Optionally, the drain of the MOS transistor Q1 of the combination switch driving circuit is connected in parallel with GND through a resistor R10, and the resistor R10 is a pull-down resistor, and functions to make the MOS transistor Q1 in an off state, and the level is low.

Optionally, the MOS transistors Q1 and Q2, the MOS transistor Q1 is a PMOS transistor, the MOS transistor Q2 is an NMOS transistor, and the MOS transistors Q1 and Q2 may be replaced by triodes.

The utility model discloses a show the effect and be:

utilize this circuit to supply power for vehicle event data recorder, can utilize single detected signal to realize vehicle event data recorder's dormancy and awaken up, reduce vehicle event data recorder to the power consumption loss of power, improve vehicle event data recorder's utilization ratio, reduce cost, simple to operate.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention;

fig. 2 is a schematic block diagram of the present invention.

Detailed Description

To make the technical problems, technical solutions and advantages solved by the present invention clearer, the following detailed description will be made with reference to the accompanying drawings and specific embodiments, and the description herein does not mean that all the subject matters corresponding to the specific examples set forth in the embodiments are cited in the claims.

As shown in fig. 1, the vehicle event data recorder power-taking circuit based on the LIN bus comprises an LIN signal acquisition circuit, a filter circuit and a combined switch driving circuit; in specific implementation, the LIN signal acquisition circuit, the filter circuit and the combined switch driving circuit are connected in series; the LIN signal acquisition circuit comprises a capacitor C3; the filter circuit is an RC filter circuit consisting of a resistor R6 and a capacitor C5; the combined switch driving circuit comprises resistors R7, R9, R3 and R4 and MOS transistors Q1 and Q2.

In specific implementation, the LIN signal acquisition circuit further comprises a resistor R8 and a diode D3, wherein the resistor R8 and the diode D3 are connected in series to serve as a discharge circuit of the capacitor C3. The filter circuit further comprises a diode D2, and the diode D2 is used for preventing the capacitor C5 from reversely discharging. The combined switch driving circuit further comprises a resistor R5 and a capacitor C4, the resistor R5 is connected with the capacitor C4 in series, the resistor R5 is connected with the drain electrode of the MOS transistor Q2, and the capacitor C4 is grounded and is used for prolonging the turn-off time of the MOS transistor Q2. And a power input end is provided with a fuse switch formed by connecting R1 and a fuse F in parallel. The power taking circuit comprises a diode D and is used for preventing voltage reversal. The power taking circuit comprises capacitors C1 and C2 and is used for power supply filtering. And a resistor R2 is arranged at the voltage output end, and a resistor R2 is a current-limiting resistor and is used for protecting the automobile data recorder. The drain of the MOS transistor Q1 of the combination switch driving circuit is connected in parallel with GND through a resistor R10, and the resistor R10 is a pull-down resistor and functions to make the MOS transistor Q1 low in level in an off state. MOS pipe Q1 is the PMOS pipe, and MOS pipe Q2 is the NMOS pipe, and MOS pipe Q1, Q2 can be replaced with the triode.

According to fig. 2 the utility model discloses the block diagram, power supply, according to LIN bus characteristic, when having LIN bus signal data transmission, LIN bus level changes, combines the electric capacity to lead to the characteristic of alternating current resistance direct current, when having data on LIN bus signal, the signal can pass through electric capacity output, makes the signal become a stable direct current signal through filter circuit, drives NMOS, continues to drive PMOS through the state of MOS, reaches a steady voltage's output.

Based on above-mentioned embodiment, the ordinary skilled person in the art can understand, the utility model provides a vehicle event data recorder gets electric circuit based on LIN bus utilizes this circuit to supply power for vehicle event data recorder, can utilize single detected signal to realize vehicle event data recorder's dormancy and awaken up, reduces vehicle event data recorder to the power consumption loss of power, improves vehicle event data recorder's utilization ratio, reduce cost, simple to operate.

Finally, it should be noted that the above description is a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.

Claims

1. A vehicle event data recorder gets electric circuit based on LIN bus which characterized in that: the automobile data recorder power supply circuit based on the LIN bus comprises an LIN signal acquisition circuit, a filter circuit and a combined switch driving circuit; the LIN signal acquisition circuit, the filter circuit and the combined switch driving circuit are connected in series; the LIN signal acquisition circuit comprises a capacitor C3; the filter circuit is an RC filter circuit consisting of a resistor R6 and a capacitor C5; the combined switch driving circuit comprises resistors R7, R9, R3 and R4 and MOS transistors Q1 and Q2.

2. A vehicle event data recorder electricity-taking circuit based on LIN bus according to claim 1, characterized in that: the LIN signal acquisition circuit further comprises a resistor R8 and a diode D3, wherein the resistor R8 and the diode D3 are connected in series to serve as a discharge circuit of the capacitor C3.

3. A vehicle event data recorder electricity-taking circuit based on LIN bus according to claim 1, characterized in that: the filter circuit further comprises a diode D2, and the diode D2 is used for preventing the capacitor C5 from reversely discharging.

4. A vehicle event data recorder electricity-taking circuit based on LIN bus according to claim 1, characterized in that: the combined switch driving circuit further comprises a resistor R5 and a capacitor C4, the resistor R5 is connected with the capacitor C4 in series, the resistor R5 is connected with the drain electrode of the MOS transistor Q2, and the capacitor C4 is grounded and is used for prolonging the turn-off time of the MOS transistor Q2.

5. A vehicle event data recorder electricity-taking circuit based on LIN bus according to claim 1, characterized in that: the input end of the power supply is provided with a fuse switch formed by connecting a resistor R1 and a fuse F in parallel.

6. A vehicle event data recorder electricity-taking circuit based on LIN bus according to claim 1, characterized in that: the power taking circuit comprises a diode D and is used for preventing voltage reversal.

7. A vehicle event data recorder electricity-taking circuit based on LIN bus according to claim 1, characterized in that: the power taking circuit comprises capacitors C1 and C2 and is used for power supply filtering.

8. A vehicle event data recorder electricity-taking circuit based on LIN bus according to claim 1, characterized in that: and a resistor R2 is arranged at the voltage output end, and a resistor R2 is a current-limiting resistor and is used for protecting the automobile data recorder.

9. A vehicle event data recorder electricity-taking circuit based on LIN bus according to claim 1, characterized in that: the drain of the MOS transistor Q1 of the combination switch driving circuit is connected in parallel with GND through a resistor R10, and the resistor R10 is a pull-down resistor and functions to make the MOS transistor Q1 low in level in an off state.

10. A vehicle event data recorder electricity-taking circuit based on LIN bus according to claim 1, characterized in that: MOS pipe Q1, Q2, MOS pipe Q1 are the PMOS pipe, MOS pipe Q2 is the NMOS pipe, MOS pipe Q1, Q2 can replace with the triode.