MOS Current Pulse Circuit Without Inductors for Laser Sources
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Solution Overview
Problem
Existing current supply devices for laser sources, which use DC/DC voltage converters with inductance, occupy significant space and limit the maximum frequency of current pulses due to the presence of inductance, making them less efficient and more cumbersome.
Innovation Solution
A current supply device that eliminates the need for a DC/DC voltage converter with inductance by using MOS transistors, resistors, and an operational amplifier to regulate current pulses, allowing for a more compact design and higher frequency operation without inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC/DC voltage converter with inductance is used to supply current pulses to a laser source, then the current can be regulated, but the surface area occupied by the device increases
Solution Approach 1:
The patent extracts and eliminates the inductance component from the DC/DC voltage converter circuit. By removing the inductance element that is traditionally necessary for current regulation, the device achieves current pulse supply to laser sources without requiring the bulky inductor component, thereby significantly reducing the surface area occupied by the device while maintaining current regulation capability through alternative circuit topology
Solution Approach 2:
The patent replaces the traditional electromagnetic inductance-based current regulation mechanism with an electronic circuit approach using MOS transistors and operational amplifiers. This substitution eliminates the need for physical inductors and their associated magnetic fields, achieving the same current control function through electronic switching and feedback without the mechanical/electromagnetic bulk
2Reliability
If a DC/DC voltage converter with inductance is used to supply current pulses, then current can be supplied, but the maximum frequency of current pulses is limited
Solution Approach 1:
By removing the inductance component from the circuit, the patent eliminates the primary limiting factor for pulse frequency. Inductors have inherent parasitic resistance and magnetic saturation effects that limit switching speed; without this component, the circuit can operate at higher frequencies while maintaining stable current supply capability to the laser source
Solution Approach 2:
The patent changes the fundamental operating parameters of the power conversion circuit by eliminating the inductive energy storage mechanism. This allows the system to operate in a capacitive or resistive-dominated regime that supports higher frequency operation, thereby increasing the maximum pulse frequency capability while preserving current supply reliability
3Reliability
If a DC/DC voltage converter with inductance is used, then current regulation is achieved, but the device becomes more complex
Solution Approach 1:
The patent simplifies the device architecture by extracting and removing the inductance component and associated complex control circuitry required for DC/DC conversion. The simplified circuit uses basic electronic components (MOS transistors, resistors, operational amplifiers) in a more straightforward configuration that achieves current regulation with fewer parts and less complexity
Data Source
AI summary
An embodiment device includes a first MOS transistor and a first resistor in series between first node and second nodes, the first resistor being connected to the second node; a second MOS transistor and a second resistor in series between the first and second nodes, the second resistor being connected to the second node and the gates of the first and second transistors being coupled to each other; an operational amplifier including a first terminal connected to a node of connection of the first resistor to the first transistor, a second terminal, and an output terminal coupled to the gate of the first transistor; and a circuit configured to supply a set point voltage to the second terminal of the amplifier.