With the rise of unmanned driving and the improvement of automation, sensors are playing an irreplaceable role in various fields. The reflection data obtained by laser radar through the high-frequency emission of multiple laser beams forms high-definition 3D “point cloud” images of surrounding objects. Lidar has been widely regarded as a necessary sensor for unmanned driving.Take the vehicle-mounted system as an example. Various sensors such as lidar, millimeter-wave radar, ultrasonic, camera, infrared and so on exist as “human eyes” to determine the position, size, external appearance and even material of objects, in blind spots, lane change assistance, Pedestrian detection, traffic signal recognition, lane departure, etc. play an important role

With the rise of unmanned driving and the improvement of automation, sensors are playing an irreplaceable role in various fields. The reflection data obtained by laser radar through the high-frequency emission of multiple laser beams forms high-definition 3D “point cloud” images of surrounding objects. Lidar has been widely regarded as a necessary sensor for unmanned driving. Take the vehicle-mounted system as an example. Various sensors such as lidar, millimeter-wave radar, ultrasonic, camera, infrared and so on exist as “human eyes” to determine the position, size, external appearance and even material of objects, in blind spots, lane change assistance, Pedestrian detection, traffic signal recognition, lane departure, etc. play a major role.

High-precision solid-state lidar: an indispensable weapon for autonomous driving in the future

As an innovative lidar enterprise, Suzhou Lingwei Intelligent Technology Co., Ltd. (hereinafter referred to as Lingwei Technology) has clearly defined its development goals at the beginning of its business and is committed to the research and development of high-end solid-state high-resolution lidar. The current product application areas cover unmanned driving, advanced assisted driving, vehicle-road coordination, security monitoring, smart cities, smart transportation, three-dimensional modeling, industrial site monitoring, rail transit, etc. Mr. Rui Mingzhao, Marketing and Sales Director and Hardware Design Manager of Lingwei Technology, said: “Currently, Lingwei Technology’s lidar products meet the most demanding applications, and the technical indicators have reached the industry-leading level.”

Solid-state distributed lidar

One host supports multiple probes, the probe is small in size, has no mechanical rotating parts, adopts MEMS technology route, has a long service life in harsh environments, meets the demanding vehicle-level requirements (at least 50,000 hours), and is impact resistant , Anti-turbulence, and 3D Flash technology has a short detection distance, and the effective detection distance is roughly 20-30m; while OPA technology is still immature and is still in the laboratory stage.

High-precision solid-state lidar: an indispensable weapon for autonomous driving in the future

High-resolution solid-state lidar

The traditional lidar is a mechanical structure, the wire harness is low, about 16 or 32 or 64 lines, and the effective detection distance is 70-80 meters. At present, the resolution developed by Lingwei Technology is as high as 480-720 lines, each line is up to 1750 pixels, single probe reaches 1.5 million points per second, and 6 probes reaches 8.4 million points per second. The effective detection distance is 200 meters. Safety margin of car regulations.

Video fusion technology

Lingwei Technology Titan M1 series of solid-state high-resolution lidars perfectly integrate video images and point clouds through algorithms to provide color point cloud images (XYZ+RGB), and provide optional algorithms for traditional XYZ space distance point clouds to fuse RGB colors , Provide the best 3D color data for perceiving surrounding objects. It is reported that the entire product line uses 1550nm light source instead of the traditional 905nm light source. This light source has no damage to the human eye, has stronger applicability, and has stronger penetrating power to rain, snow, haze, etc.

Facing industry pain points

In the face of market pain points, Mr. Rui said: Among all applications, unmanned driving has the most stringent and demanding requirements. It requires a longer effective detection range, longer working time, impact resistance, and anti-turbulence. It is exactly the same as the high-resolution solid-state lidar target created by Lingwei Technology.

High reliability: using MEMS technology route, no mechanical rotating parts, working life of more than 50,000 hours;
High resolution: 700-line lidar, with a minimum angular resolution of 0.01°, which can more effectively detect and identify pedestrians and form high-definition 3D point cloud images;
Long detection distance: the effective distance can reach 200m, and the farthest detection distance can reach 1000m;
High precision: 1550nm light source is used, which can effectively alleviate the problems of rain, snow, fog and haze weather, such as accuracy degradation;
Video fusion technology: The product itself is equipped with a camera, which can point-to-point fusion of point cloud data and camera RGB information;
The viewing angle can be customized: there are a variety of viewing angle products, the maximum viewing angle of a single product is 125° horizontal and 45° vertical;
Cost-effective: Compared with low-speed products, there is only one pair of transceivers in the 480 wiring harness, lower material costs, and higher cost-effective;

Demand for power

Lidar has a wide range of applications, and the power supply system is different depending on the application: if in the vehicle system, the power supply is 12V on-board power; in the AGV/UAV system, the power supply is 48V batteries; in the industrial field, the power supply may be 24V field bus voltage, so it is very important to be able to support a wide range of power supply modules. In addition, the working environment of lidar is also particularly complicated. The power supply system must ensure stable output under any working conditions, and the power supply requirements are also very clear:

Wide input voltage: to ensure that the product is suitable for all power supply systems;
High efficiency: to ensure the endurance of the system and the optimal design of the system;
High integration: limited by the internal space, the module volume is required to be as small as possible;
High reliability and stability: It should have stable and reliable output in harsh environments such as high temperature, bumps, vibration, and lightning;
Low noise: There are many sensitive components in the lidar series, and the power module must ensure its own strong EMC and EMI capabilities;

High-precision solid-state lidar: an indispensable weapon for autonomous driving in the future

At present, Lingwei Technology has fully adopted Vicor PI3740 power conversion module in Titan M1 high-end series products. PI3740 can convert the power supply voltage of 8-60V into 12V voltage for system use. If other voltage rails such as 5V and 3.3V are needed in the system, then the POL power chip can perform secondary conversion.

Advantages of Viocr power supply in the system

PI3740 is a power module with high conversion efficiency and power density. PI3740 buck-boost regulator supports 8-60VDC operating voltage range, and can provide up to 140W of power and up to 8A of output current with an efficiency of up to 96%. Mr. Rui Mingzhao, Marketing and Sales Director and Hardware Design Manager of Lingwei Technology (Xiamen) Co., Ltd. said: “Vicor’s reference design is very good. Based on the excellent reference design and the on-site support of the technical team, the product introduction and evaluation work progress. Quite smoothly, showing excellent system advantages:

PI3740 is small in size, high in efficiency, and high in integration, which meets the power supply requirements of lidar systems;
PI3740’s 8~60V wide input voltage adapts to multi-field applications;
The high level of integration of the Vicor power module reduces the usage of peripheral devices, and the design is convenient and flexible;
In the system test, a number of tests such as high and low temperature, impact, limit, load aging, etc. have been carried out, and the power module is reliable and stable;

Future trend

In the future, lidar will develop towards low cost, solid state, and mass production. The system requires that the power supply has a sufficiently wide voltage range, the size is further reduced, and the conversion efficiency is further improved. In the field of unmanned driving applications, the overall direction is still to achieve higher resolution and accuracy of lidar to further ensure the safety of unmanned driving. I believe that with the cooperation of Vicor’s support team, future new product verification work will be smoother.

The Links:   LM130SS1T579 GD400HFL120C2S IGBT-MODULE