LED Driver Bleeder Circuit for Multi-Switch Leakage
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Solution Overview
Problem
Current LED lamps are not suitable for connection to multi-switch arrangements, as they continue to light or flicker due to small leakage currents even when the switch is off, with no known solution for non-dim low power LED lamps.
Innovation Solution
A driver for LED lamps that includes a bleeder circuit connected in series between the voltage input port and the LED driver, which absorbs leakage currents from multi-switches, preventing flickering by decoupling the LED from unstable multi-switch outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED lamps are connected to multi-switch arrangements, then the LED lamp can be controlled by multiple switches, but leakage currents cause the LED lamp to light or flicker even when the switch is off
Solution Approach 1:
A bleeder circuit is introduced as an intermediary component between the multi-switch arrangement and the LED driver. This bleeder circuit provides a dedicated path for leakage currents to flow through, preventing them from reaching the LED driver and causing unwanted illumination or flickering. The bleeder circuit effectively mediates the interaction between the multi-switch and LED lamp, enabling reliable operation with multiple switches while suppressing harmful leakage effects.
2Reliability
If a bleeder circuit is added to suppress leakage currents, then the LED lamp can operate reliably with multi-switches, but the device complexity increases
Solution Approach 1:
The harmful leakage current path is extracted and separated from the main LED driving circuit by introducing a dedicated bleeder circuit. This extraction allows the leakage suppression function to be handled independently, preventing interference with the LED driver's normal operation. The bleeder circuit is configured to only handle the small leakage currents, leaving the main power path unchanged and simple.
Solution Approach 2:
The bleeder circuit is designed with specific parameter values (resistance, capacitance) that are optimized to handle only the small leakage currents typical of multi-switch arrangements. By carefully selecting these parameters, the circuit provides effective leakage suppression while maintaining minimal impact on the overall system performance and complexity. The parameters are chosen to ensure the bleeder circuit remains inactive during normal LED operation.
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 the use of LED lamps with multi-switches by effectively suppressing leakage currents, ensuring the LED lamp remains off when the switch is off and operates smoothly when on, without affecting the performance of non-dimmable LED drivers.
Implementation Method 1
the bleeder circuit may comprise at least one resistance or at least one resistor... the at least one resistor is designed such that the entire leakage current of the multi switch is absorbed
Implementation Method 2
the bleeder circuit may comprise at least one transistor... the control circuit is adapted for controlling the at least one transistor of the bleeder circuit
Data Source
AI summary
Driver for an LED lamp, including an LED driver for driving an LED, a voltage input port adapted to connect the driver to a multi switch as a power source, a voltage output port connecting the LED to the LED driver, and a bleeder circuit suppressing leakage current provided by the multi switch, wherein the bleeder circuit is connected in series between the voltage input port and the LED driver.