In recent years, the new energy automobile industry has entered a stage of accelerated development. my country's new energy automobile industry, after years of continuous efforts, has significantly improved its technical level, improved its industrial system, and greatly enhanced its corporate competitiveness, showing a good situation of "double improvement" in market size and development quality. At the same time, through the country's cultivation of the entire industrial chain of new energy vehicles for many years, each link has gradually matured, rich and diversified new energy vehicle products continue to meet market demand, and the use environment is gradually optimized and improved. Today we will talk about the T-BOX system in new energy vehicles.
tbox is an Internet of Vehicles system that uses long-distance communication and information science and technology to provide vehicles with services such as driving data collection, remote query and control, and fault monitoring.
The main functions of tbox are:
1. Collect and store driving data and track records, analyze these data, and then display them on the display.
2. Use the tbox system to query and control the car remotely, such as controlling the car to open the door, whistle, flash the lights, turn on the air conditioner, start the engine, etc., and you can also check the location of the car.
3. Other functions: such as road rescue, fault diagnosis, and abnormal reminder. After encountering an accident, the tbox system will automatically dial a rescue call to allow users to be rescued in time. When there is a fault, it will give timely feedback; if there is an abnormality such as being towed away, anti-theft, etc., it will alarm and remind.
We disassemble the inside of TBOX, and we can clearly see the internal structure, which mainly includes the main control module, power supply module, 4G module, WIFI module, Bluetooth module, storage module, CAN module, etc. The TBOX terminal transmits the vehicle status information through the CAN bus. After the GPS module collects the vehicle positioning information, it sends it to the TSP platform through the 4G wireless communication network, and the TSP platform sends it to the mobile phone APP or WEB control interface to feed back relevant information to the user.
In the important functions of TBOX, CODEC (codec) plays a key role and also serves as the main communication bridge. Its important functions are as follows:
1. Data signal conversion (conversion of analog signal and digital signal);
2. Data compression and storage (saving bandwidth and data space, improving transmission efficiency);
3. Audio and video signal processing (transmission of high-quality audio and video);
4. Compatibility and interoperability (support multi-device and system communication).
TBOX audio architecture:
Nuvoton has launched two low-power, high-bit codecs for automotive grades, with single and dual-channel specifications, suitable for general-purpose automotive audio applications; in addition to high-precision 24-bit stereo ADC and DAC, the device also It integrates a wide range of additional functions to simplify the design of the audio system, and provides a general-purpose QFN32 (5*5mm) package, which is convenient for developers to shorten the time from product design to mass production.
Taking NAU88U22A as an example, it has built-in advanced digital signal processing functions:
1, 5-band equalizer,
2. 3D Audio Enhancer,
3. Microphone mixed signal automatic level control,
4. Line input for playback path via ADC
5. Additional digital filtering options.
NAU88U22A supports a wide voltage range and two sets of power supply. The digital core part can run at 1.7V to save power consumption (operating voltage range: 1.7V-3.6V); the speaker BTL output and two auxiliary line outputs can use 5V Power supply operation (operating voltage range: 2.5V-5.5V) to increase output power capability up to 1W power. At the same time, flexible power-saving modes can also be realized through software control of internal registers.
In terms of automotive lithium battery safety, Nuvoton has launched the KA84933UA series, a Nuvoton battery monitoring IC (BM-IC) that includes diagnostic mechanisms and safety functions, and can monitor battery management failures and various battery abnormalities.
Lithium-ion batteries equipped with electric vehicles are required to ensure high safety because of the danger of smoke and fire. Nuvoton's automotive battery monitoring IC uses a unique SOI process to isolate devices and functional areas to achieve a fully redundant measurement system. Coupled with a highly redundant communication structure, a system with high safety and reliability can be realized. Easier design and development of automotive battery systems for ISO26262 ASIL-D.
System Diagram
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About Nuvoton
Nuvoton Technology's foundry (originated from Winbond Electronics' 6-inch wafer fab) is located in Hsinchu Science Park, Taiwan, with a monthly production capacity of 45,000 pieces. Since 1992, it has more than 20 years of foundry service experience , after splitting from Winbond Electronics in 2008, fully focused on foundry. Nuvoton’s foundry currently provides processes above 0.35 microns, including Generic Logic, Mixed Signal, High Voltage, Ultra High Voltage, Power Management, Mask ROM ( Flat Cell), embedded Logic Non-Volatile Memory, and customized processes (such as: IGBT, MOSFET, TVS, BioChip, Pressure Sensor, and Light Sensor), etc.