LiDAR Emission Circuit With Capacitor Buffering for False Pulse Prevention
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Solution Overview
Problem
Existing LiDAR systems face issues with false laser emissions due to infinitely large charging currents exceeding the current threshold, leading to potential damage and reduced reliability and accuracy.
Innovation Solution
A constant current emission circuit with a constant current power adjustable module and control circuits to regulate the charging current, ensuring a stable and controlled energy storage, thereby preventing false emissions and maintaining laser reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant voltage emission power supply is used with a switch control module, then the laser can be controlled to emit, but the charging current can be infinitely large exceeding the current threshold, causing false laser emissions
Solution Approach 1:
An energy storage element (capacitor) is introduced as an intermediary between the constant voltage power supply and the laser. This capacitor charges at a controlled rate through the power supply and then discharges rapidly to drive the laser, preventing direct infinite current flow to the laser while maintaining emission control capability
Solution Approach 2:
The energy storage element performs preliminary energy storage from the constant voltage power supply before laser emission. By pre-charging the capacitor during a controlled time period, the system prepares the necessary energy without causing harmful current spikes, enabling reliable subsequent laser emission
2Device complexity
If the charging current is not limited, then the charging process is simple, but the current can damage the laser and cause false emissions
Solution Approach 1:
The energy storage element serves as a protective intermediary that naturally limits charging current through its capacitance properties while still allowing sufficient energy transfer. This simple component prevents harmful current spikes without requiring complex current limiting circuits
Solution Approach 2:
The energy storage element provides beforehand cushioning by absorbing and smoothing the charging current from the power supply. This cushioning effect prevents current spikes from reaching the laser during the charging phase, protecting the laser from damage
3Measurement precision
If different laser powers are required, then detection accuracy can be improved, but the circuit structure becomes more complex
Solution Approach 1:
The system dynamically adjusts laser power by controlling the charging time of the energy storage element rather than using complex power adjustment circuits. By varying the duration of the charging phase, different energy levels are stored, which translates to different laser emission powers when discharged, achieving power control with simple timing adjustment
Solution Approach 2:
The system uses periodic charging and discharging cycles of the energy storage element to control laser power. By adjusting the charging time within each cycle, different amounts of energy are accumulated, enabling variable laser power output through simple temporal control rather than complex circuitry
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
The solution ensures reliable and accurate laser emissions by maintaining a constant current flow, reducing energy loss, and allowing for adjustable laser power, enhancing detection accuracy and range.
Implementation Method 1
a constant current power adjustable module, including an energy storage element... An input end of the constant current power adjustable module is connected to the emission power supply, for receiving output the power supply voltage to charge the energy storage element
Data Source
AI summary
A constant current emission circuit and a LiDAR are provided. The constant current emission circuit includes a constant current power adjustable module and a constant voltage emission module. The constant current power adjustable module includes an energy storage element. The input end of the constant current power adjustable module is used to connect to the emission power supply that outputs the power supply voltage to charge the energy storage element. The constant current power adjustable module provides a constant current to the energy storage element and adjusts the energy stored in the energy storage element. The constant voltage emission module includes a laser connected to the energy storage element. The laser emits a laser beam when the energy storage element discharges energy. Different energies stored in the energy storage element correspond to different laser emission powers.