CN219145385U

CN219145385U - Communication circuit of electric vehicle 4G central control system

Info

Publication number: CN219145385U
Application number: CN202223188379.2U
Authority: CN
Inventors: 堵爱国; 聂绍尧
Original assignee: Shenzhen Lieba Technology Co ltd
Current assignee: Shenzhen Lieba Technology Co ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-06-06
Anticipated expiration: 2032-11-29

Abstract

The utility model discloses a communication circuit of a 4G central control system of an electric vehicle, which comprises a level conversion chip, wherein an R pin of the level conversion chip is connected with the 4G central control system, a first pull-up resistor is arranged between the R pin of the level conversion chip and the 4G central control system, an RE pin and a DE pin of the level conversion chip are jointly connected with a collector of a current control triode, a base of the current control triode is connected to the 4G central control system through the first current control resistor, the collector of the current control triode is also connected to a power supply through a second current control resistor, an A pin and a B pin of the level conversion chip are respectively connected to two ends of a matching resistor, an A pin of the level conversion chip is also connected with a pull-down resistor, and a B pin of the level conversion chip is connected with a second pull-up resistor. The utility model has simple circuit, less peripheral circuits, stable and simple communication process and can effectively save IO port resources.

Description

Communication circuit of electric vehicle 4G central control system

Technical Field

The utility model relates to the technical field of electric vehicle central control communication, in particular to a communication circuit of an electric vehicle 4G central control system.

Background

With the increasingly outstanding contradiction between energy structures and air pollution of fuel vehicles and the development of high-energy battery technology, the modern power electronics and electric transmission technology realizes the transmission, adjustment and control of the automobile and power vehicles in an electric mode, and becomes an important development direction of the automobile and the non-motor power vehicles, so that the electric vehicle has the advantages of high research efficiency, quick response, safety, reliability, and the like, and is widely used in a plurality of vehicles.

The existing electric vehicle tends to intelligent development, more and more integrated functions such as alarm, positioning, intelligent voice and the like are realized, a 4G module is used as a central control, and the 4G module performs data receiving and transmitting processing with peripheral functional modules through interfaces such as UART/GPIO/IIC and the like, so that 485 level signals are related, and 485 needs to be converted into UART interfaces and then input into the 4G module. The existing 485 signal conversion is complex, and excessive IO resources are occupied, so that improvement is needed.

Disclosure of Invention

The utility model aims to provide a communication circuit of a central control system of an electric vehicle 4G.

In order to achieve the above purpose, the following technical scheme is adopted:

the utility model provides a communication circuit of accuse system in electric motor car 4G, includes the level shift chip, the accuse system in the level shift chip's R pin is connected 4G, be provided with first pull-up resistor between level shift chip's R pin and the 4G accuse system in, the RE pin and the DE pin of level shift chip connect the collecting electrode of accuse stream triode jointly, the base of accuse stream triode is connected to the accuse system in 4G through first accuse stream resistor, the collecting electrode of accuse stream triode still is connected to power supply through the second accuse stream resistor, level shift chip's A pin and B pin are connected in the both ends of matching resistor respectively, level shift chip's A pin still is connected with pull-down resistor, level shift chip's B pin is connected with the second pull-up resistor, level shift chip's D pin ground connection.

Furthermore, two ends of the matching resistor are also respectively connected with one ends of the first current limiting resistor and the second current limiting resistor, the other ends of the first current limiting resistor and the second current limiting resistor are respectively connected with an ESD protection tube, and the ESD protection tube is grounded.

Further, a third current limiting resistor is arranged between the R pin of the level conversion chip and the 4G central control system.

Further, the first pull-up resistor and the VCC pin of the level shift chip are commonly connected to a power supply and a ground capacitor.

By adopting the scheme, the utility model has the beneficial effects that:

the utility model has simple circuit, less peripheral circuits, stable and simple communication process and can effectively save IO port resources.

Drawings

Fig. 1 is a schematic circuit diagram of the present utility model.

Detailed Description

The utility model will be described in detail below with reference to the drawings and the specific embodiments.

Referring to fig. 1, the utility model provides a communication circuit of a central control system of an electric vehicle 4G, which comprises a level conversion chip U12, wherein an R pin of the level conversion chip U12 is connected with the central control system of the 4G, a first pull-up resistor R103 is arranged between the R pin of the level conversion chip U12 and the central control system of the 4G, an RE pin and a DE pin of the level conversion chip U12 are jointly connected with a collector of a current control triode Q13, a base of the current control triode Q13 is connected with the central control system of the 4G through a first current control resistor R102, the collector of the current control triode Q13 is also connected with a power supply through a second current control resistor R99, an a pin and a B pin of the level conversion chip U12 are respectively connected with two ends of a matching resistor R105, an a pin of the level conversion chip U12 is also connected with a pull-down resistor R101, a B pin of the level conversion chip U12 is connected with a second pull-up resistor R100, and a D pin of the level conversion chip U12 is grounded.

The level conversion chip U12 is specifically a UART-485 level conversion chip U12, an RS485 transceiver element with the model of WT485 can be adopted, and the power supply can be specifically a chip power supply in a 4G central control system.

The two ends of the matching resistor R105 are also respectively connected with one ends of a first current limiting resistor R106 and a second current limiting resistor R107, the other ends of the first current limiting resistor R106 and the second current limiting resistor R107 are respectively connected with an ESD protection tube Q6, and the ESD protection tube Q6 is grounded. And plays a role in protecting the device.

A third current limiting resistor R104 is arranged between the R pin of the level conversion chip U12 and the 4G central control system. Acting to limit the current.

The first pull-up resistor R103 and the VCC pin of the level shifter chip U12 are commonly connected to the power supply and the ground capacitor C8.

Working principle: the level conversion chip U12 adopts an RS485 transceiver chip of the WT485, the current control triode Q13, the first current control resistor R102 and the second current control resistor R99 form an automatic current control circuit, the matching resistor R105 is arranged according to the terminal connected with 485-B and 485-A, the ESD protection tube Q6 plays a role in protection, when the central control of the 4G is idle, a signal 4G_TX1 of a base electrode of the current control triode Q13 is high, a RE pin of the level conversion chip U12 is low, the circuit is in a receiving mode, data is converted from 485 to UART signals, when the central control of the 4G is to send high level data, the level conversion chip U12 is in a receiving mode, the bus is idle and defaults to high level, the level conversion chip U12 outputs high level, when the central control of the 4G is to send level, the level conversion chip U12 is in a sending mode, and a D pin is grounded, so the level conversion chip U12 outputs low level. The effects of stability, simplicity and IO port resource saving are achieved.

By adopting the scheme, the utility model has the beneficial effects that:

The foregoing description of the preferred embodiment of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. The utility model provides a communication circuit of accuse system in electric motor car 4G, its characterized in that, includes the level conversion chip, the R pin of level conversion chip is connected the accuse system in 4G, be provided with first pull-up resistor between the R pin of level conversion chip and the accuse system in 4G, the RE pin and the DE pin of level conversion chip are connected the collecting electrode of accuse class triode jointly, the base of accuse class triode is connected to the accuse system in 4G through first accuse class resistor, the collecting electrode of accuse class triode still is connected to power supply through the second accuse class resistor, the A pin and the B pin of level conversion chip are connected in the both ends of matching resistor respectively, the A pin of level conversion chip still is connected with pull-down resistor, the B pin of level conversion chip is connected with the second pull-up resistor, the D pin of level conversion chip ground connection.

2. The communication circuit of the central control system of the electric vehicle 4G according to claim 1, wherein two ends of the matching resistor are further connected to one ends of a first current limiting resistor and a second current limiting resistor, respectively, and the other ends of the first current limiting resistor and the second current limiting resistor are connected to an ESD protection tube, respectively, and the ESD protection tube is grounded.

3. The communication circuit of the 4G central control system of the electric vehicle according to claim 1, wherein a third current limiting resistor is disposed between the R pin of the level conversion chip and the 4G central control system.

4. The communication circuit of the electric vehicle 4G central control system according to claim 1, wherein the first pull-up resistor and the VCC pin of the level shift chip are commonly connected to a power supply and a ground capacitor.