Pulse-Driven Light Emitter Voltage Precharge for Stable Output
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Solution Overview
Problem
Existing driving circuits for light-emitting elements, such as laser diodes, face issues with inefficient power consumption and voltage fluctuations during pulse-driven operations, leading to irregular light output and potential overshoot due to varying discharge periods.
Innovation Solution
A light-emitting device configuration that includes a processor, switching power source, condenser, and switches, which controls current and voltage through pulse-driven operations, using a microcomputer to adjust reference voltages and synchronize switching to maintain consistent light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a constant-voltage power source and FET switch are used to save power consumption, then power consumption is reduced, but voltage fluctuations occur during pulse-driven operations causing irregular light output
Solution Approach 1:
The voltage adjustment circuit pre-adjusts the condenser voltage before each pulse-driven operation based on the previous output voltage and discharge period. This preliminary action ensures that the light-emitting element receives consistent voltage regardless of varying discharge periods, maintaining reliable light output while using power-saving FET switch architecture
2Adaptability or versatility
If pulse-driven operations are performed with varying discharge periods, then flexibility in operation is improved, but voltage fluctuations cause current irregularity and potential overshoot
Solution Approach 1:
The voltage adjustment circuit uses feedback from the previous output voltage measurement to determine the appropriate pre-adjustment voltage for the condenser. This feedback mechanism compensates for voltage fluctuations caused by varying discharge periods, ensuring consistent square-wave current flow and preventing overshoot while maintaining flexible operation cycles
Solution Approach 2:
The system dynamically changes the condenser voltage parameter based on the measured previous output voltage and discharge period characteristics. By adjusting this key parameter before each pulse operation, the system maintains current waveform consistency and prevents overshoot regardless of operation cycle variations
3Device complexity
If no voltage adjustment is performed before pulse operations, then device complexity is reduced, but voltage fluctuations lead to power inefficiencies and irregular light output
Solution Approach 1:
The voltage adjustment circuit serves multiple functions: it pre-charges the condenser to optimal voltage, compensates for voltage drops during discharge periods, and prevents overshoot. This multi-functional approach improves power efficiency without significantly increasing device complexity, as the same circuitry integrates into the existing pulse-driven architecture
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 stable, square-wave current flow and consistent light output, minimizing overshoot and power inefficiencies by adjusting voltages before each pulse, even with irregular emission cycles.
Implementation Method 1
a condenser, which smooths an output voltage of the switching power source
Implementation Method 2
The voltage source is an operational amplifier configured to compare the reference voltage input into a positive input terminal thereof with the output voltage input into a negative input terminal thereof and output a current such that the reference voltage and the output voltage are the same
Data Source
AI summary
In a light-emitting device according to a first aspect of the present invention, a condenser is configured to smooth an output voltage of a switching power source. A voltage source of the light-emitting device is configured to adjust a voltage of the condenser. A processor of the light-emitting device is configured to turn on a light-emitting element of the light-emitting device. The processor is configured to measure the output voltage in a turning-on period of the light-emitting element and store the measured output voltage on the storage medium as a reference voltage. The processor is configured to turn off the light emitting element. The processor is configured to control a voltage output from the voltage source on the basis of the reference voltage stored on the storage medium so as to adjust the voltage of the condenser immediately before the light-emitting element is next turned on.