Semiconductor Light Source Drive Device Voltage Control
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Solution Overview
Problem
Existing semiconductor light source drive devices experience delays in increasing current when powered by a switching power source, leading to insufficient brightness and potential video display issues due to increased power loss and resistance in FETs.
Innovation Solution
A semiconductor light source drive device with a switching power source, a constant current circuit, and a detection circuit that controls voltage output based on detected voltage, ensuring minimal delay in current increase by optimizing the resistance value of the FET and reducing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a switching power source is used to supply power to the semiconductor light source element, then power efficiency is improved, but a delay occurs in increasing the current flowing through the semiconductor light source element
Solution Approach 1:
The controller performs preliminary action by increasing the voltage output from the switching power source in advance according to the amount to be varied in the current value of the constant current circuit, before actually varying the current value. This anticipatory voltage adjustment ensures that when the current needs to increase, the power source is already prepared with sufficient voltage headroom, eliminating the delay that would otherwise occur while the power source ramps up its output.
Solution Approach 2:
The system dynamically adjusts the voltage output from the switching power source based on the required current variation. The controller continuously monitors and adapts the voltage level in real-time according to the operational demands of the constant current circuit, allowing the power delivery characteristics to change flexibly rather than being fixed, thereby optimizing both response time and efficiency.
2Speed
If the voltage output from the switching power source is increased to prevent delay in current increase, then current response time is improved, but power loss increases
Solution Approach 1:
The system employs feedback control where the controller monitors the actual current flowing through the semiconductor light source element and adjusts the voltage output from the switching power source accordingly. This closed-loop control ensures that the voltage is increased only to the extent necessary to achieve the desired current increase, preventing excessive voltage application that would cause unnecessary power loss while still maintaining fast current response.
Solution Approach 2:
The controller dynamically changes the voltage parameter output from the switching power source based on the operational requirements. By adjusting the voltage level precisely according to the needed current variation, the system optimizes the balance between response speed and power efficiency, avoiding both insufficient voltage (which causes delay) and excessive voltage (which causes power loss).
Data Source
AI summary
The semiconductor light source drive device according to the present disclosure includes: a switching power source that is connected in series with a semiconductor light source element and a constant current circuit to output a predetermined voltage to the semiconductor light source element and the constant current circuit; a detection circuit that detects a voltage at a connecting point between the semiconductor light source element and the constant current circuit; and a controller that controls the voltage output from the switching power source based on the voltage detected by the detection circuit, and controls a current value of the constant current circuit based on a switching signal. The controller, prior to varying the current value of the constant current circuit, varies the voltage output from the switching power source in accordance with an amount to be varied in the current value of the constant current circuit.