introduction
With the development of modern technology and the outstanding problems of world resources and environment, electric vehicles have become a hot topic in the research field of the automotive industry because of their advantages of environmental protection, energy saving and high efficiency. Of course, while electric vehicles are developing, the research and production of the corresponding power supply system is also indispensable. The maturity and development of the vehicle charger technology has played a vital role in the popularity of electric vehicles. Currently, electric vehicles are The high cost, the difficulty of application, etc., its market value has not been fully utilized, so there are not many suppliers that can provide complete and reliable solutions for car chargers. As a leading supplier of test and measurement solutions in the field of new energy, Idex. The test solution is not only able to fully meet the needs of different models of on-board charger testing, but also equipped with software to control the charger and test solution, with important functions not available in other manufacturers' test solutions.
First, the working principle of the car charger
The most powerful source of power for power vehicles is the power battery. Currently, the most widely used lithium-ion battery is a battery pack made up of multiple single cells. Therefore, the on-board charger should consider the actual demand of lithium battery charging, and also consider the harsh environment of the vehicle battery; therefore, the solution of the vehicle charger must meet the high pressure resistance, high reliability and high efficiency (see Figure 1).
The main application of the charger is to charge the power battery on the electric car. According to whether it is installed in the car, the charger can be divided into a vehicle type (with the model) and a fixed type. The fixed charger is generally a large charger fixed in the charging station, mainly based on high power and fast charging. The car charger is installed inside the vehicle, and its advantage is that it can be charged at any time in the garage, roadside or residential area where AC power is supplied, and the power is relatively small.
The vehicle charger system mainly adopts the method of voltage and current feedback to achieve the purpose of constant current and constant voltage charging, and at the same time, it is necessary to control and monitor various parameters of the charging process. The circuit of the charger consists of a main charging circuit and an auxiliary circuit. The main charging circuit uses a full-bridge inverter circuit. On the other hand, in order to detect the voltage, current and temperature in real time, and report a series of states such as battery leakage, thermal management, alarm, and remaining capacity, the vehicle power battery needs a battery. The management system performs auxiliary control.
How to monitor the series of properties, working conditions and parameters of the charging motor and power battery has become a problem that every power car manufacturer must face, and the vehicle charger test solution of Idex can solve these problems perfectly.
Second, domestic and foreign charger solutions and standards
Currently, both IEC and ISO are accelerating the development of international standards for charging infrastructure, but because countries have different power bases, the standards applied by countries vary. At present, the international standard for charging interface consists of three parts: IEC 62196-1, IEC62196-2 and IEC 62196-3 (see Figure 2). It is later defined by the United States, Germany, and Italy as: type1, type2, and type3. . The type1 support countries are mainly the United States and Japan, the type2 support countries are Germany, the type3 mainly supports the countries Italy and France, China's overall communication interface is close to type2, adopts a seven-core structure, can be single-phase charging and three-phase charging . On the locking scheme, China's standards are more consistent with the US program. Both mechanical locks and electronic locks are preferred. In 2006, China completed a national standard GB/T 20234, which is equivalent to IEC 62196-1. .
In the market of car chargers and charging piles, the US chargepoint, Japan's Toyota, Mitsubishi, Honda, Nissan, the British chargemaster, Germany's BMW, China's national grid have implemented a series of power car power supply in their respective national markets. Program. In the automotive sector, major automakers at home and abroad have also turned their attention to the emerging industry of power vehicles.
Third, Idex car charger test program introduction
As a leading supplier of test and measurement solutions in the field of new energy, Itech is in compliance with the requirements of GBT18487.1 electric vehicle conduction charging system: GBT20234.1, GBT20234.2, GBT20234.3, The electrical performance and durability of the charger are tested in accordance with QC/T895-2011 standards. It has many unique and important functions, such as: electrical performance and durability testing of the charger, simulation of the vehicle control system, control and monitoring of the fault status of the charger. And operating parameters, user-friendly simulation of the product to various operating environments, Itech's charger test program is compatible with a variety of charger charging protocols, suitable for a variety of charger testing.
The ITECH car charger covers more than 20 tests, from the characteristic test of the input, the static test, the power supply test, the load effect test of the output, the output voltage range test, the mixed effect test to the various protection items, Timing and special item tests are available and fully integrated into the system, allowing customers to select the required items for testing (see Figure 3).
As mentioned above, the vehicle controller, motor controller and battery management system are the most important core of the power car. The test solution of the Intex vehicle and charging interface not only monitors the working status of the charger, but also dynamically adjusts the charging current, voltage and power parameters of the charger according to the data provided by the battery management system (BMS). Fully simulate smart charging.
The Edexx car charger test system is composed of a variety of built-in Idex precision instruments and PC software. The accuracy and stability of the single instrument are equipped with functions not available from other manufacturers, such as:
Idx's high-power wide-range DC power supply IT6500C supports master-slave parallel connection, expands up to 30kW output capability, with power dissipator to meet 90kW discharge test requirements, supports list sequence, output impedance setting, high resolution and Accuracy and complete protection measures (see Figure 4).
The IT8800 electronic load has a dynamic mode of up to 25KHz to complete any current change mode, adjustable rise and fall speed, 100 sets of memory capacity, dynamic test function, and automatic test function (see Figure 5).
The Idex test system adds the function of importing DBC files, is compatible with CAN bus communication mode, and is suitable for different manufacturers, without the type of charger test.
The Idx test system is also equipped with many measurement and simulation equipment such as oscilloscope, interface analog board, DVM, power analysis instrument, etc., which provides many conveniences for customers' testing.
Most of the on-board charger test systems on the market are cumbersome to operate, the software interface is difficult to handle, and even the operator has a strong language programming foundation to operate, so that customers need to pay long-term operation training, and many software require users to do it themselves. Editing the test flow of each test item, the test efficiency is low, and many manufacturers are discouraged. The difference is that the host computer software of the Idex vehicle charger test system is more user-friendly and close to the requirements in the interface design. The test system fully builds the electrical performance test items of the charger into the software, and the user only needs to drag and drop the required test items. And the flow of each test item has been built in the system by Itech in the factory. The user only needs to open the corresponding test item interface and fill in relevant parameters. When the test is completed, the software will automatically determine the test. The result (see Figure 7).
At present, although some manufacturers provide car charger test system solutions for customers to test independently, but due to poor integration, control and test functions can not be combined, greatly operational difficulty and cost, compared to the Idex charger test The system can not only realize the control of the test system hardware, but also realize the control and monitoring of the charger itself, which greatly simplifies the testing process. (See Figure 8).
In the same test solution, the Idx test system involves more comprehensive and cost-effective test items. The simulation test of smart charging is closer to the actual situation and the software is easy to use. There are some additional practical functions to simplify the operation. Greatly improved user experience, is the best choice for new energy power car testing.
Summary: Although electric vehicles bring many opportunities to the automotive industry, there are still many shortcomings in the construction of facilities and industry standards. The complex application environment of electric vehicles and the strict safety standards make the testing and inspection of energy supply. It becomes especially important. When the electronics industry is testing new energy equipment, Yidex has been at the forefront, contributing to the popularization and application of new energy vehicles with the most comprehensive solutions, contributing to the sustainable development of the earth's energy.
ALD GROUP LIMITED , https://www.aldvapor.com