Laboratory Intelligent Automatic Security System Based on GSM and Single Chip Microcomputer

Constrained by oil reserves and environmental pressure, countries have been vigorously developing new energy vehicles in recent years. According to relevant authoritative organizations, by 2020, half of the new cars sold in the global auto market will adopt hybrid technology to varying degrees.

In order to encourage the development of new energy vehicles, my country has continuously improved its supporting measures and introduced fiscal subsidy policies: fiscal policies are used to encourage the use of energy-saving and new energy vehicles in public service areas such as public transportation, taxis, official business, sanitation and postal services, and subsidies are provided to units that promote the use of energy-saving and new energy vehicles.

The huge market space and strong policy support have given rise to the development of new energy vehicle-related parts industry and testing equipment. As a key technology, power batteries have naturally become the focus of investment for domestic companies. In the process of research and development and production of power electronics, a kind of testing equipment is required - high-power electronic load.

Shenzhen Feisitech Technology Co., Ltd. (hereinafter referred to as Feisitech) has developed the FT6800A series of high-power programmable DC electronic loads (models FT6801A, FT6802A, FT6803A, FT6804A, FT6807A, FT6808A, FT68014A and FT6815A, etc., with a power of up to 50KW). Some electronic loads in this series have a single power range from 1.6KW to 10.4KW, a maximum current of 600A, and a maximum voltage of 500V. The basic parameters of each model of electronic load are as follows:

Feisi Technology's high-power electronic load not only includes basic test modes such as CC, CV, CR and CP, but also provides transient testing and sequence testing, and can simulate changes in various dynamic loads. At the same time, simulated short-circuit operations can be performed through the buttons on the electronic load.

The FT6800A series of high-power electronic loads can help users provide a series of protection functions for the equipment under test, such as over-current, over-voltage, over-power, over-temperature and voltage reversal. The FT6800A series of high-power electronic loads has four communication interfaces, including GPIB, RS232, LAN and USB. Through these interfaces, users can easily achieve remote monitoring by connecting to computers using standard command systems.

The host computer software configured for the FT6800A series of high power electronic loads allows users to print reports, generate images, export reports and save data for intuitive analysis, recording and test reports.

According to the functions and features of the above-mentioned FT6800A series high-power electronic load, the following main items can be tested in the power battery test:

1. Battery internal resistance test

Internal resistance is an important technical indicator for measuring battery performance. Battery internal resistance can be roughly divided into two types: charging state internal resistance and discharging state internal resistance.

The internal resistance in the charged state refers to the internal resistance measured when the battery is fully charged; the internal resistance in the discharged state refers to the internal resistance measured after the battery is fully discharged (discharged to the standard cut-off voltage). Generally speaking, the internal resistance in the charged state is relatively stable, while the internal resistance in the discharged state is unstable and much higher than the normal value, so measuring the internal resistance in the charged state is more practical.

The FT6800A series high-power electronic load uses a constant current discharge method to test the internal resistance of the battery. According to Ohm's law R=U/I, the battery is controlled to pass a constant current in a short time (2-3s), and the voltage at both ends of the battery is measured at the same time, and the internal resistance of the battery is calculated according to the formula.

2. Battery capacity test

Capacity is another important indicator of the battery. The capacity test results can reflect the reliability and remaining life of the battery, so it is very necessary to perform such tests before replacing the battery. During the capacity test, the battery voltage will decrease as the discharge amount increases. When the voltage is lower than the termination voltage, the test ends. During the test, you can view the battery voltage, discharge current, discharge time, discharge amount and other parameters. With the help of the host computer software, you can also observe the battery discharge curve.

3. Transient test

The FT6800 series electronic load transient test function provides three modes: continuous, flip and pulse. The transient frequency can reach up to 20KHz, and the switching slope can be set, where the maximum current slope can reach 60A/us. This function is often used to test the transient characteristics of power batteries, the protection characteristics of battery protection boards, and battery pulse charging.

4. OCP test

The FT6800A series high power electronic load provides a rising ramp current to test whether the voltage of the device under test can reach the termination potential to determine whether the OCP protection is normal. This test checks the output response of the device under test under overload conditions.

In the tolerance check setting interface, set the lower and upper limits of the current check. If the current check range is set, the screen will prompt "GO" or "NG" after the test is completed.

Compared with traditional cars, my country's new energy vehicle development is also in the forefront, not losing at the starting line. The development goal of new energy vehicles is: by 2012, 10% of the newly produced cars in China are energy-saving and new energy vehicles. Based on the annual production of 10 million cars by then, my country's new energy vehicles will reach an annual production scale of 1 million. This has strengthened the determination of domestic and foreign automobile manufacturers to develop new energy vehicles in China.

It is believed that with the continuous development of the new energy vehicle industry, power batteries, as the key technology for its development, will also have a huge market space and strong potential, and Feiss's FT6800A series high-power programmable DC electronic load will also usher in another unprecedented development opportunity.