Dry goods sharing! Bronze sword high integration, cost-effective new car door drive

I. Introduction

As one of the core components of electric vehicles, motor controller is an important indicator to measure the R&D capability of electric vehicle technology, and it is related to the development of China's new energy vehicle technology in the future. The electric vehicle motor controller integrates the main control module, IGBT module, IGBT gate driver and cooling system. Among them, the IGBT gate driver is the core component of the weak current control high voltage, which is of great significance for the control and protection of the IGBT module.

Second, the demand for automotive IGBT gate drive

The application environment of the vehicle field requires very high performance for the whole vehicle and the device. The life of the vehicle must be 15 years, and the life expectancy of the controller and components is more than 8000 hours. At the same time, it must be ensured in various environments such as high temperature, vibration and dust. It works well, which puts very high demands on the products of automotive-grade applications.

High performance: The selected components must have high reliability, high safety, and a wide range of environmental adaptability (temperature, humidity, vibration, etc.);

Long life: requires products with extremely low defect rate (PPM level) and long life of 15 years;

Cost-effective: In high-volume delivery, not only must the product be stable, but also cost advantages.

In summary, a good IGBT gate driver must have high performance, high reliability, low cost, as well as miniaturization and ease of use. The ASIC chip technology can meet the above requirements: on the one hand, the integrated product can reduce the number of components, significantly reduce the product size, and reduce the cost in large quantities; on the other hand, it can provide a complete high-performance solution for the characteristics. And at the same time achieve better EMC performance. At present, the IGBT gate driver for vehicles on the market basically adopts an integrated scheme, which is divided into two modes: optocoupler isolation and digital isolation.

Third, the gate drive technology to meet the requirements of the vehicle

In 2013, Bronze Sword Technology launched the first chipset dedicated to IGBT drive in China. At present, this chipset solution has been widely used in photovoltaic, wind power, smart grid, energy saving and environmental protection, rail transit, electric vehicles and other fields. In 2017, Bronze Sword Technology promotes gate driver products based on FluxLinkTM signal isolation technology. This product is one of the most comprehensive driver chips on the market, with the following advantages:

1. FluxLinkTM isolation technology has a minimum isolation pitch of 0.46mm, which guarantees excellent isolation strength. The 9.5mm creepage distance and CTI 600 ensure stable operation at 950 V DC bus voltage and promise to strengthen insulation;

2. Provide unipolar power supply to generate positive and negative swing gate drive. The chip has built-in +15 V voltage regulation function. The secondary side does not need additional voltage regulator circuit for voltage regulation to achieve negative voltage shutdown.

3. The maximum 8A drive peak current output is the driver chip with the largest gate current on the market. No additional push-pull circuit is needed when driving the vehicle IGBT module.

4, resistance string short-circuit detection, accurate detection and not susceptible to interference;

5. Independently turn off the output pin (GH and GL pin), and set the Rgon and Rgoff resistance values â€‹â€‹separately without external diodes;

6. Reliable advanced soft-shutdown technology ASSD, which can be used without verification and does not require additional soft-shutdown resistors. For example, once the function is working properly in the 100 A module, it means that it can work on the 300 A module (same package);

7. The primary and secondary power supply undervoltage protection function (UVLO) provides more comprehensive protection;

8, the chip working environment temperature range of -40 Â° C to 125 Â° C, easily reach the automotive-level application temperature requirements.