Design of a vehicle intelligent power supply

The Intelligent Transportation System (ITS) research field is the development direction of the future transportation system. It is the effective integration of advanced information technology, data communication transmission technology, electronic sensing technology, control technology and computer technology. The ground transportation management system establishes a comprehensive, real-time, accurate and efficient integrated transportation management system that functions in a wide range and in all directions.

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1 Introduction to ETC System

Electronic Toll Collection (ETC) is designed as a Road Side Unit (RSU), OnBoard Unit (OBU), IC card, computer security control technology, network and accounting. Most of the composition.

Its composition is shown in Figure 1.1:

Figure 1. 1 ETC system composition diagram

Figure 1. 1 ETC system composition diagram

The OBU contains the identification information of the vehicle, such as the license plate number and the car ID number, which are usually installed on the windshield in front of the vehicle. The RSU is installed next to the toll booth, and the loop sensor is installed under the driveway floor. The central management system has a large database that stores information on a large number of registered vehicles and users. When the vehicle passes through the toll gate, the loop sensor senses the vehicle, the roadside unit sends an inquiry signal, and the onboard unit responds. The two-way communication and data exchange are carried out, and the central management system obtains information such as vehicle identification and vehicle type and compares and judges corresponding information in the database, and controls the management system to generate different actions according to different situations. The roadside unit communicates with the onboard unit to exchange information and exchange information to achieve automatic identification of the vehicle, and automatically deducts the toll from the user's dedicated account, thereby realizing automatic charging.

Because the OBU plays a very important role in the entire ETC system, the performance of the power module is directly related to whether the OBU can work normally. There are two types of existing OBU power supply methods, but each has its own shortcomings. Accordingly, new low-power power supply design methods should be produced.

2 Low-power intelligent power supply application design scheme in electronic non-stop charging system

For example, an embedded processor-centric system such as OBU is mainly composed of processor power consumption and peripheral circuit power consumption. Considering the actual operation, the time of passing through the toll booth is very short during the whole process of driving on the road. The OBU only needs to work when the car passes through the toll booth, and the working time is less than one second. Time does not need to work. OBU intelligent power management uses a battery-powered method to control the OBU to operate in two modes, sleep mode and active mode; when the car enters the toll booth, the OBU is activated, starts working, is in active mode; when the transaction is completed, the car leaves the toll booth After that, the OBU immediately stops working and enters sleep mode. According to this feature, the strategy of hierarchical management of the power supply is divided into standby power supply and working power supply, as shown in Figure 2.1.

Figure 2. 1 OBU power management classification module structure

Figure 2. 1 OBU power management classification module structure

At the same time, in order to realize further time-sharing power supply control, the working power module divides the independent power supply loop according to the functional modules, and the power of each module is independently controllable, and is coordinated by the main controller.

The activated MCU uses interrupt writing mode to judge each I/O and time-sharing control, and outputs DC/DC enable high-level signals of each power consumption module. Time-sharing is RF receiving, RF transmission, baseband circuit, and IC. Card reading and writing, account management and human-machine interface power supply; at any time, the system only supplies power to at most 2 modules except the main controller, which greatly reduces the power consumption of the system.

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