LED Driver Circuit Memory Function for Color Temperature Settings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LED lamp systems lack a memory function to retain user-selected color temperature settings, forcing users to choose from predetermined options each time the lamps are turned on, without the ability to remember previous preferences.
Innovation Solution
An LED driver circuit with an AC/DC converter, energy storage circuit, and microcontroller unit (MCU) that receives dimmer voltage from a TRIAC dimmer, allowing the MCU to store and recall user-selected color temperature settings by sensing off/on events and maintaining the last selected color temperature after the dimmer is turned off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If proprietary control chips are used to control color temperatures, then color temperature control is achieved, but memory function to retain user settings is lost
Solution Approach 1:
The energy storage circuit pre-charges capacitors during the ON state to store electrical energy before the dimmer is turned off. This preliminary energy storage enables the MCU to maintain operation and retain color temperature settings during the OFF period, preventing information loss without requiring complex additional memory hardware.
Solution Approach 2:
The system uses its own power supply circuit to charge the energy storage circuit during normal operation, and the stored energy automatically powers the MCU during the OFF state. This self-service mechanism enables the memory function without requiring external power sources or complex battery management systems.
2Loss of time
If the dimmer is turned off completely, then power consumption is reduced, but the MCU cannot sense off-time events or count consecutive on/off events
Solution Approach 1:
The energy storage circuit is pre-charged during the ON state to provide sufficient energy for the MCU to operate during the subsequent OFF state. This preliminary energy preparation enables the MCU to sense off-time events and count on/off cycles without requiring continuous power supply or high energy consumption during the OFF period.
3Loss of information
If the MCU operates continuously to maintain settings, then color temperature memory is maintained, but power consumption increases
Solution Approach 1:
The MCU operates periodically rather than continuously - it is powered by the energy storage circuit only during specific periods (when the dimmer is OFF and needs to process off-time events). This periodic operation mode enables the MCU to maintain color temperature settings and sense events without requiring continuous power consumption.
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
Enables user-selectable color temperature memory, allowing users to maintain their preferred settings across power cycles and adjust brightness using a commercially available TRIAC dimmer, enhancing user convenience and control over LED lamp illumination.
Implementation Method 1
an energy storage circuit... the energy storage unit is also configured to provide the supply voltage to the switching control unit for a time period after the state of the dimmer is changed from the ON state to the Off state
Data Source
AI summary
A lamp driving circuit has an AC/DC converter receives a dimmer voltage from a TRIAC dimmer with an on/off switch to turn on or off a lamp module having a number of LED lamp groups. The driving circuit also has an energy storage circuit and an MCU to control the switching of each of the lamp groups. The energy storage circuit provides a prolonged supply voltage to the MCU for a period of time after the dimmer is turned off so that the MCU can sense the off-time of the dimmer and count the number of consecutive times the dimmer is turned off and on during a preset time in order to control the color temperature of the lamp module. The MCU is programmed to store information regarding the color temperature the user has selected between a number of color temperatures such as 3000K, 4000K and 5000K.