Handling method of electric vehicle power lithium battery charging

　　Author ：Iflowpower – Portable Power Station Supplier

Most new electronic systems (except for active safety, autonomous driving, and information entertainment systems) can be used to help achieve energy savings, such as direct injection technology, start stop systems and body BLDC. Motors and chassis electronically. Carbon dioxide emission regulations (limited 95 g / km) promote the urgent need to improve fuel efficiency and automatic electricity level, especially in traffic busy city center and metropolis, to significantly reduce CO2 and particulate matter emissions to maintain air quality .

The following factors represent and affect the future trend and success of electric vehicles (EVs): ● Battery technology–Energy density, size and price ● Miles and efficiency ● Charging performance, time and infrastructure construction ● Price, incentives and tax policies ● Reliability and maintenance cost ● Safety When the accident crashes, the electronic system should be with all energy storage. Components (such as batteries, capacitances and sensing components) disconnected. The pen directly high voltage will cause serious physical damage to the driver, passengers and emergency rescuers.

In order to release energy such as these energy storage elements, the resistive virtual load should be connected immediately. Intelligent energy management is very important for ensuring all security-related uses (such as braking, steering, rain brush, lighting, and passive safety systems, etc.) are very important during long-distance driving.

In addition to security electronic systems with the highest priority in power consumption, the comfort electronics should also be considered. Summer air conditioning, as well as winter passenger warmers and window removal is a modern car is not available and equipment. The huge challenge in electric vehicle design is to reduce the power consumption of these high power loads.

The next most important task is to supply enough charging station in the area of ​​the car operation (especially when parking). Quick charging is very important to end users, because usually no users will wait for the overflow for more than two hours. During the time of work, business visits or shopping, modern electric cars are not a foreign.

In addition, incentive measures are essential, such as discount measures, alternative energy and reduce parking fees. An essential supporting element for electric cars is a battery charging system. Its tight function is to convert AC (AC) into DC (DC), execute power factor correction (PFC) function, as well as Chargingprofile, matching battery system.

Battery charging has two important methods and their own advantages: 1. ON-BOARD: single-phase and three-phase AC charging of the grid - easy to connect grid. - No large charging infrastructure.

2. Non-Board: Ultra-fast and large straight point non-car charging - short time, high power, fast charge performance - a critical part of the charging infrastructure vehicle charging system with universal high-power DC charger is complete AC / DC converter integrated into the body network. It connects the car to the AC grid and converts AC power into direct current.

Because it is a high voltage, it is guaranteed that the security becomes very important and in use. All electronic systems must meet these automotive quality standards. Another option is to use a non-car DC / DC charger to enter high-voltage direct current to electric vehicles to replace an alternating current.

This method can supply very high power charging function, do not carry the charger to help reduce the weight of the car charger to the body and save a lot of space, just responsible for the control of the battery charging stage and non-car charger Communication. This allows the car away from AC voltage and does not have to worry about the relevant safety hazards it brings, and it can also reduce the instant peak voltage that ECU may bear. There have been such maximum power chargers in the market, which will gradually invest in the transportation infrastructure, such as parking areas and bus stops.

The third way is that there is currently an endless contactless sensing. Its purpose is to provide almost ubiquitous charging facilities to reduce charging time, as well as supply almost instant charging services. Semiconductors actively and passive devices industry should design new components to reduce the cost of electric vehicle controllers and actuators.

Among them, the mechanical integration + high voltage driver is to optimize the key part of reliability and improve efficiency. Multiphase converters and inverters are the category of useful use. All important components manufacturers are developing high cost-effective new components and new technologies to meet high-power and high energy levels.

The desire components in the electric car are: ● IGBT module for motor drive and inverter ● High voltage MOSFET ● Large current filtering inductance ● Flat transformer ● optocoupler ● Solid Relays ● High voltage voltage resistance ● PTC thermistor limit ● High voltage diode ● Turnover bridge module passive components need more space and have high cost. Its design is also more critical than the design of the semiconductor active component module. The new circuit topology is dedicated to improving the switching frequency of the circuit, and can reduce the size of the passive element (such as transformers, filters, energy storage components).

These topologies include a thin film capacitance that can be used, for a DC bus or buffered aluminum capacitance, and test resistance for high pressure and large electrical testing. The plane transformer has a magical treatment of high switching frequency circuits and can supply optimum efficiency in the use of high voltage DC / DC converters. Electronic drives for electric vehicles are divided into two categories: ● High-pressure use (150VDC-550VDC battery line) ● Low-voltage use (12V load) use to switch from high pressure lithium electron battery to 12V output DC / DC buck converter for tight applications Low-power load in 100W and below.

To do the overall efficiency of these converters as much as possible. One of the biggest challenges faced by electric cars is to ensure the efficiency of motor drives driven by high voltage semiconductor. In addition, personal safety is also a tight concern.

A spark is displayed for alert high-voltage switch, and the battery and other components are discharged using virtual energy resistance. This can quickly eliminate energy, with alert to fire. Emergency disconnecting battery connection is another category to optimize, and redesign the current large-scale approach.

Like the same common car, the system design engineer of electric vehicles also wants to reduce the number of components. An example of achieving this goal is a new series of voltage-resistant resistance with excellent precision characteristics in 3kV power rating and below. These surface mounted high-pressure voltage dividing resistors can replace 20-40 single resistances for tradition.

They are currently used as a floating-point divider to test the voltage stability of the board system, and support the voltage drop adjustment to improve efficiency. Various parts of electric vehicles are accompanied by their unique challenges. For example, an isolation DC / DC converter for motor driving for air conditioning compressors is very efficient.

In this design, it has a very low height discrete component. When the voltage is above 30 Vac and 60VDC, it is necessary to enhance the electric shock protection against the human body. Low voltage (12V digital / simulated parts and high voltage terminals are indispensable).

These categories will be affected by standardization: Non-car charging) Electric vehicles currently support short-range driving (uniform 50 km per day, up to 100 kilometers), but can not meet the requirements of long-distance driving (more 150 km). Since the current price of electric vehicles is higher than conventional cars, investing in charging infrastructure and development alternative energy sources (desire to rely on government strength and incentive measures) can prompt the pure electric vehicle (BEV)'s large-scale development. .