Power Supply Device Dynamic Current Control for LED Lighting
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Solution Overview
Problem
Existing power distribution systems face inefficiencies due to constant output current supply, which leads to increased losses in cables and connectors, especially when electrical consumers have variable power consumption, such as in LED lighting systems with dimming functions.
Innovation Solution
A power distribution system that adapts output current based on the power consumed by the electrical consumer using a pulse-width modulated shunt switch, where the power supply device includes a detection unit to adjust the output current amplitude and timing in response to detected voltage levels, reducing losses by modulating the current according to the duty cycle of the PWM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant output current is supplied to electrical consumers, then the power supply device can maintain stable operation, but power losses in cables and connectors increase
Solution Approach 1:
The power supply device transitions from constant current mode to dynamic current control, adjusting output current in real-time based on the electrical consumer's actual power consumption. The control unit continuously monitors power consumption and modulates the output current accordingly, making the system adaptive rather than static.
Solution Approach 2:
The system implements a feedback mechanism where the control unit monitors the electrical consumer's power consumption and uses this information to adjust the output current. This closed-loop control ensures that the power supply adapts to changing load conditions while minimizing energy losses in the distribution network.
2Power
If output current is increased to meet peak power demands, then power availability is improved, but energy losses in cables and connectors increase
Solution Approach 1:
The power supply device dynamically adjusts its output current based on real-time power consumption measurements, providing high current only when needed and reducing current when demand is lower. This eliminates the need to maintain constant high current levels that would cause excessive losses during low-demand periods.
Solution Approach 2:
The system changes the output current parameter dynamically based on the electrical consumer's actual power consumption. By continuously monitoring and adjusting this parameter, the system optimizes the balance between power availability and energy efficiency, delivering appropriate current levels rather than constant maximum current.
3Productivity
If pulse-width modulation is used to control power consumption, then dimming control efficiency is improved, but flicker behavior may worsen
Solution Approach 1:
The control unit uses feedback from power consumption monitoring to synchronize and optimize the PWM control signals. By detecting actual power consumption patterns and adjusting PWM duty cycles accordingly, the system achieves smooth dimming control while minimizing flicker effects through adaptive signal timing.
Solution Approach 2:
The system employs periodic PWM control with optimized duty cycles and timing. By carefully designing the periodic control waveform and synchronizing it with the power consumption patterns, the system achieves efficient dimming control while minimizing visible flicker through proper frequency and duty cycle selection.
Data Source
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AI summary
The invention relates to a power supply device (3) for supplying power to an electrical consumer (2) having a variable power consumption in a power distribution system (1), particularly in a DC power distribution system for lighting applications, wherein the power supply device (3) is output current controlled and is adapted to provide the output current depending on the power consumed by the electrical consumer (2). Since the output current is not constant, but controlled depending on the power consumed by the electrical consumer (2) being preferentially a lamp, the output current can be adapted to the actually consumed power, thereby allowing for an improved efficiency of distributing the power in the power distribution system (1). In particular, if less power is consumed by the electrical consumer (2), a lower output current can be provided, thereby reducing losses in cables and electrical connectors of the power distribution system.