LiDAR Laser Emitting Circuit Layout for Staggered Pulse Driving
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Solution Overview
Problem
Conventional LiDAR apparatuses face complexity in circuit configuration and increased costs due to one-to-one connections between lasers and drive circuits, leading to poor channel consistency and heat accumulation, which limits the development of high-resolution laser emitting modules.
Innovation Solution
The implementation of a laser emitting module with at least two groups of laser emitting circuits, where each group includes a charging energy storage circuit and multiple energy releasing circuits with energy releasing switches, allowing for staggered emissions and improved heat dissipation, reducing circuit complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one-to-one connection between lasers and drive circuits is used, then each laser can be driven independently, but circuit complexity increases and costs increase
Solution Approach 1:
Multiple energy releasing circuits share a common charging energy storage circuit. The charging circuit charges multiple capacitors sequentially, and each capacitor can independently discharge to drive its corresponding laser, reducing the number of charging circuits needed while maintaining independent laser driving capability.
Solution Approach 2:
The charging energy storage circuit serves multiple functions: it charges multiple different energy releasing circuits, each of which can drive different lasers. This multi-functional design allows one charging circuit to replace what would traditionally require multiple separate charging circuits.
2Reliability
If one-to-one connection between lasers and drive circuits is used, then each laser can be driven independently, but costs increase
Solution Approach 1:
Multiple energy releasing circuits share a common charging energy storage circuit. The charging circuit charges multiple capacitors sequentially, and each capacitor can independently discharge to drive its corresponding laser, reducing the number of charging circuits needed while maintaining independent laser driving capability.
Solution Approach 2:
The charging energy storage circuit serves multiple functions: it charges multiple different energy releasing circuits, each of which can drive different lasers. This multi-functional design allows one charging circuit to replace what would traditionally require multiple separate charging circuits.
3Measurement precision
If complex circuit configuration is used, then high resolution can be achieved, but heat accumulation occurs and channel consistency deteriorates
Solution Approach 1:
The charging energy storage circuit charges capacitors in a periodic sequence rather than simultaneously. By controlling the switching transistors to charge capacitors at different time intervals, the system distributes heat generation over time, preventing heat accumulation while maintaining the ability to drive multiple lasers for high vertical resolution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration achieves high vertical resolution, simplifies the circuit configuration, reduces design costs, and improves channel consistency by allowing for staggered emissions and enhanced heat dissipation, thereby addressing the limitations of conventional LiDAR systems.
Implementation Method 1
a first end of the inductor forms a power supply input end of the charging energy storage circuit, a second end of the inductor, an anode of the diode, and a drain electrode of the first electronic switch transistor are connected together, a gate electrode of the first electronic switch transistor forms a controlled end of the charging energy storage circuit, a source electrode of the first electronic switch transistor is grounded, a cathode of the diode and a first end of the capacitor are connected to form a power supply output end of the charging energy storage circuit
Implementation Method 2
any one of the energy releasing circuits includes an energy releasing switch and at least one laser connected in series, the energy releasing circuit is triggered to connect by a corresponding discharge signal, to drive the at least one laser in the energy releasing circuit to emit a laser pulse
Data Source
AI summary
The present disclosure provides a laser emitting module and a LiDAR apparatus. The laser emitting module includes at least two groups of laser emitting circuits. Each group of the laser emitting circuits includes one charging energy storage circuit and at least one energy releasing circuit. The energy releasing circuit includes an energy releasing switch and at least one laser. The energy releasing switch is turned on to drive at least one laser to work correspondingly. The charging energy storage circuit and the energy releasing circuit are arranged one-to-one or one-to-multiple. Any two adjacent emissions correspond to different groups of the laser emitting circuits.