Inductor Driver Circuit for Pulsed Laser Flash Output
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Solution Overview
Problem
Existing driver circuits for optical systems, such as those used in LIDAR applications, face challenges in generating an appropriate output voltage for emitting flashes by lasers, as a constant output voltage is not suitable for this purpose.
Innovation Solution
A driver circuit comprising a first inductor, a switch, a diode, and a capacitor, configured to store energy when the switch is conducting and release it as a pulse when the switch is non-conducting, thereby generating an output voltage suitable for optical circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a voltage converter with constant output voltage is used, then the circuit structure is simple, but it cannot generate the appropriate pulsed output voltage required for laser flash emission
Solution Approach 1:
The patent employs periodic switching of the semiconductor switch to generate pulsed output voltage. The switch alternates between conducting and non-conducting states, causing the inductor to periodically store and release energy, thereby producing the required pulsed voltage waveform for laser flash emission instead of a constant voltage output.
Solution Approach 2:
The patent changes the output voltage parameter from constant to pulsed by introducing a switching mechanism. The control circuit adjusts the switching duty cycle and frequency to vary the output voltage characteristics, enabling the voltage converter to adapt between different output modes (continuous vs. pulsed) to meet different operational requirements.
2Power
If energy is stored in the inductor and released as a pulse, then the output voltage is appropriate for laser emission, but the circuit complexity increases with additional components
Solution Approach 1:
The patent designs the voltage converter circuit to perform multiple functions: voltage conversion, energy storage, pulse generation, and current limiting. The same inductor and switching components serve both the power conversion function and the pulse generation function, eliminating the need for separate pulse generation circuitry and reducing overall system complexity despite the enhanced functionality.
Solution Approach 2:
The patent merges the pulse generation function with the voltage conversion function by integrating the switching mechanism into the power converter circuit. The inductor serves dual purposes: as an energy storage element for voltage conversion and as the core component for generating output pulses. This consolidation reduces the total number of components compared to having separate voltage converter and pulse generator circuits.
3Productivity
If the switch is switched rapidly to generate pulses, then the pulse output is achieved, but noise and jitter increase
Solution Approach 1:
The patent introduces an RC circuit (resistor-capacitor network) as an intermediary element between the switching mechanism and the laser driver. This RC circuit acts as a low-pass filter that smooths out the high-frequency switching noise and jitter while preserving the essential pulse waveform characteristics, thereby reducing harmful electromagnetic interference and signal instability.
Solution Approach 2:
The patent utilizes the inherent parasitic resistance and capacitance in the circuit components to dampen oscillations and reduce noise. The resistive elements dissipate high-frequency switching noise, converting harmful electromagnetic interference into harmless heat, while the capacitive elements filter out voltage ripple and jitter, transforming potential problems into beneficial noise reduction effects.
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 driver circuit effectively generates a pulse output voltage suitable for optical circuits, such as LIDAR systems, ensuring efficient energy transfer and minimizing noise and jitter, while being electrically efficient and capable of handling high currents.
Implementation Method 1
By setting the first switch in a conducting state, energy is stored in the first inductor. After setting the first switch in a non-conducting state, the stored energy is provided via the series circuit to the output terminal and generates an output voltage at the output terminal with a pulse.
Data Source
AI summary
A driver circuit may include a first inductor with a first terminal coupled to a first voltage terminal and a first switch with a first and a second terminal. The first terminal of the first switch may be coupled to a second terminal of the first inductor via a first node and the second terminal of the first switch may be coupled to a second voltage terminal. Moreover, the driver circuit may include a diode with a first terminal coupled to the first node, an output terminal, and a first capacitor with a first electrode coupled to a second terminal of the diode and a second electrode coupled to the output terminal.