LED Driver Heat Reduction via Segmented Control
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Solution Overview
Problem
Existing LED lighting systems face reliability issues due to high heat generation and complex wiring, particularly because the driver is often placed near the LED light source, leading to increased temperature and complexity in circuit design, especially when dealing with voltage differences between LED branches and the need for open circuit protection.
Innovation Solution
A load driving device and system that includes a voltage and current regulative main circuit with a sampling unit and output current controller, allowing for separate packaging of the current-limiting circuit and driver, reducing heat and complexity by sampling output characteristics and adjusting current limits to maintain a steady-state operating point, thereby simplifying wiring and eliminating the need for individual open circuit protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver is placed nearby the LED light source inside the lighting device, then the driver can directly control the light source, but the temperature of the driver increases seriously affecting reliability
Solution Approach 1:
The patent divides the lighting system into separate functional modules: the driver is separated from the LED light source and placed in a different location (such as a power supply unit or control box). This spatial segmentation allows the driver to operate away from the high-temperature environment near the LED, improving reliability while maintaining control capability through electrical connection.
Solution Approach 2:
The patent introduces intermediate wiring and connection structures to transmit control signals and power between the separated driver and the LED light source. These intermediaries (wiring, connectors, bus bars) enable the driver to control the LED remotely without direct thermal coupling, resolving the contradiction between ease of control and reliability.
2Device complexity
If the linear adjustment current-limiting circuit is enclosed inside the driver, then the driver can perform voltage sampling, but the loss of the adjustment transistor is large resulting in serious heat
Solution Approach 1:
The patent extracts the current-limiting circuit and voltage sampling function from the driver and relocates them to the LED module or power supply unit. This extraction removes the heat-generating adjustment transistor from the driver, reducing thermal load and improving efficiency while maintaining the necessary control functions through distributed architecture.
Solution Approach 2:
The patent changes the operational parameters and location of the current-limiting circuit, moving it from inside the driver to an external position. This parameter change (location) allows the circuit to function similarly while avoiding the thermal constraints inside the driver, reducing energy loss and heat generation.
3Reliability
If the output voltage control circuit samples the voltage of the post stage circuit, then the control can be performed, but the wiring between the voltage source and post stage circuit becomes complicated
Solution Approach 1:
The patent merges the voltage sampling function with the existing power output terminals of the voltage source. By using the same wiring path for both power delivery and voltage sampling, the patent eliminates additional wiring complexity while maintaining accurate control capability.
Solution Approach 2:
The patent designs the output terminals of the voltage source to serve multiple functions: both power delivery to the load and voltage sampling for control. This multi-functionality eliminates the need for separate sampling wiring, simplifying the overall circuit while maintaining control accuracy.
4Reliability
If open circuit protection is provided for each LED load, then faults can be protected against, but the circuit complexity increases
Solution Approach 1:
The patent designs the driver to have universal protection capability that applies to all LED loads through a single control mechanism. The driver can detect and respond to open circuit faults in any LED branch using a unified protection strategy, eliminating the need for individual protection circuits for each load while maintaining comprehensive fault protection.
Data Source
AI summary
A load driving device and system, and a limiting point control method and device. The load driving device comprising: a voltage/current regulative main circuit placed under the control of an output current controller, for use in conducting a voltage conversion on an input voltage, and in supplying electric power to a subsequent load unit; a sampling unit connected to an output terminal of the main circuit, for use in sampling an output feature parameter of the main circuit; the output current controller, for use in controlling a limiting point of the main circuit, and on the basis of the adjustment direction of the limiting point and on changes of the output feature parameters of the main circuit before and after an adjustment, determining a steady working point for the main circuit, and controlling the main circuit to work at the steady working point. The load driving device and system enable an increase in driver reliability and a reduction in circuit complexity.