Lighting Driver Standby Control via PWM Peak Detection
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Solution Overview
Problem
Conventional lighting systems require two separate voltage control signals and independent isolation devices for reference and standby control, leading to increased component costs and printed circuit board space utilization.
Innovation Solution
A lighting system and method that uses a single output source, where a microcontroller generates a pulse width modulated output reference signal, and a peak detection circuit generates a standby control signal, reducing the need for multiple isolation devices by using a single electrical isolation device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two separate voltage control signals are used for reference and standby control, then the control functionality is complete, but the component count and PCB space increase
Solution Approach 1:
The patent combines two separate control signal paths (reference control and standby control) into a single signal path. The microcontroller generates one control signal that is routed through a single isolation device to the driver circuit, where it serves both reference voltage control and standby control functions through different circuit configurations.
Solution Approach 2:
The single control signal generated by the microcontroller performs multiple functions: it controls the reference voltage level for LED dimming and simultaneously controls the standby mode of the driver circuit. This multi-functional approach eliminates the need for separate dedicated control signals for each function.
2Reliability
If two independent isolation devices are used for reference and standby control signals, then signal isolation is ensured, but cost and PCB space increase
Solution Approach 1:
The patent merges two separate isolation devices into a single isolation device in the signal path. The single isolated control signal is then distributed to multiple control points within the driver circuit through galvanically isolated pathways, maintaining signal isolation while reducing component count.
Solution Approach 2:
The single isolation device acts as an intermediary that provides galvanic isolation between the microcontroller and the driver circuit. It mediates the control signals, allowing a single isolated signal to control multiple functions (reference voltage and standby mode) without requiring multiple separate isolation devices.
3Measurement precision
If two separate control signals are used, then precise control is achieved, but the microcontroller complexity and cost increase
Solution Approach 1:
The microcontroller generates a single universal control signal that controls multiple aspects of the driver circuit operation. By using one signal line for both reference voltage control and standby control, the microcontroller's output pin count and configuration complexity are reduced while maintaining precise control capability through proper signal conditioning in the driver circuit.
Data Source
AI summary
Provided is control method and a lighting system having a plurality of lighting elements that includes a power supply for supplying power, a lighting driver having a microcontroller and configured to receive power from the power supply and output power to the plurality of lighting elements for operation thereof, a control system in electrical or wireless communication with the microcontroller, and configured to communicate with the microcontroller, to control an operational mode of the plurality of lighting elements via the lighting driver, wherein the microcontroller is configured to transmit an output reference signal as a control signal, and a peak detection circuit that receives the output reference control signal from the microcontroller, and generates a standby control signal from the output reference control signal received, to thereby operate the plurality of lighting elements in an on or standby mode.