LED Lighting Circuit Bypass Control for Clean On-Off Switching
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Solution Overview
Problem
Existing lighting circuits for vehicle lamps, such as headlamps and turn signal lamps, face challenges in quickly turning on or off light emitting elements like LEDs without instantaneous lighting issues and in ensuring instantaneous turning off, especially when transitioning from all off to all on or vice versa.
Innovation Solution
A lighting circuit with a control unit that manages a DC/DC converter and bypass switches, where the control unit waits for a predetermined time after starting voltage conversion before turning off bypass switches to ensure LEDs are turned on correctly and stops voltage conversion when turning off to prevent power loss and instantaneous lighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If voltage conversion is continued to enable instant turning on, then response speed is improved, but power loss increases
Solution Approach 1:
The control unit performs preliminary action by stopping the voltage conversion a predetermined time before the turning-off instruction is actually executed. This anticipatory approach allows the system to prepare for the next turning-on operation by clearing residual energy and resetting the conversion state, enabling faster response to subsequent turning-on instructions while avoiding continuous power consumption during idle periods.
2Speed
If bypass switches are turned off immediately to turn on LEDs, then turning on speed is improved, but instantaneous lighting control precision deteriorates
Solution Approach 1:
The control unit turns off the bypass switches a predetermined time before the actual lighting instruction is executed. This preliminary action allows the LED circuit to prepare for optimal current flow and voltage distribution, ensuring that when the LEDs actually turn on, they do so with precise control over brightness and timing, avoiding instantaneous lighting issues while maintaining fast response.
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
This solution enables quick and consistent turning on and off of LEDs, preventing power loss and ensuring a smooth transition without instantaneous lighting, thus improving the appearance and functionality of vehicle lamps.
Implementation Method 1
a DC/DC converter configured to receive DC power supply and perform voltage conversion to supply drive current to the light source unit
Data Source
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AI summary
The present invention realizes an appropriate operation of turning-on and turning off lighting. A lighting circuit includes a voltage conversion unit which is configured to receive a DC voltage to perform voltage conversion and supply a drive current to a light source unit including a plurality of light emitting elements, a bypass path which includes a plurality of bypass switches which are connected in parallel with the light emitting elements and are connected in series; and a control unit which is configured to control the voltage conversion unit and the bypass switches. In the lighting circuit, when turning off all of the light emitting elements from a state where at least one light emitting element is on, the control unit controls the voltage conversion to stop after turning on all of the bypass switches.