LED Driver Circuit with Dual Power Supply and Dynamic Current Control
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Solution Overview
Problem
Modern multimedia devices, such as smartphones and compact cameras, face challenges in powering high-power components like LED flashes due to increasing power consumption, leading to large and costly supercapacitors for energy storage and management.
Innovation Solution
A circuit arrangement with adjustable current paths and a control unit that allows for efficient double power supply using both battery voltage and charge voltage from a supercapacitor, enabling a compact and cost-effective implementation by adjusting current intensities for charging and operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a supercapacitor is used to store sufficient energy for the light source, then the energy supply capability is improved, but the size and cost of the supercapacitor increase
Solution Approach 1:
The patent combines two power sources (battery and supercapacitor) into a dual-power supply system. The battery provides continuous low-power operation while the supercapacitor provides high-power bursts for the light source, merging their strengths to reduce the supercapacitor size requirement while maintaining energy supply capability
Solution Approach 2:
The patent implements dynamic power management by switching between different power paths based on operational requirements. The control unit dynamically adjusts current distribution between the battery and supercapacitor, enabling the system to use the supercapacitor only when high power is needed, thus reducing its required capacity and size
2Volume of moving object
If the supercapacitor size is reduced for compact construction, then the device compactness is improved, but the energy storage capacity decreases
Solution Approach 1:
The patent segments the energy storage function between two components: the battery handles continuous energy storage while the smaller supercapacitor handles peak power delivery. This segmentation allows the supercapacitor to be much smaller while the overall energy storage capacity is maintained through the battery
Solution Approach 2:
The battery serves multiple functions: it provides continuous power for low-power operations and also charges the supercapacitor for high-power bursts. This multi-functionality allows the system to maintain adequate energy storage capacity with a smaller supercapacitor
3Device complexity
If a conventional capacitor is used with limited energy management measures, then the circuit complexity is reduced, but the energy efficiency deteriorates
Solution Approach 1:
The patent implements feedback control through a control unit that monitors the system state and adjusts current distribution accordingly. This feedback mechanism optimizes energy efficiency by directing current through the most efficient path based on real-time conditions, such as using the supercapacitor when it has sufficient charge
4Ease of manufacture
If the supercapacitor is made smaller to reduce cost, then the manufacturing cost is reduced, but the power delivery capability for flash operation decreases
Solution Approach 1:
The patent uses preliminary charging of the supercapacitor from the battery during normal operation. This preliminary energy storage allows the smaller supercapacitor to deliver sufficient power for flash operations by having been charged in advance, thus reducing both size and cost while maintaining power delivery capability
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
This solution allows for a smaller, more compact supercapacitor design, reducing overall size and cost while ensuring reliable operation of light sources, even in compact constructions, by utilizing both battery and capacitor voltages efficiently.
Implementation Method 1
a conventional capacitor or, preferably, a supercapacitor is connected to the terminal for a capacitor. It is charged with a charging voltage depending on the battery voltage and is available to the circuit as an energy accumulator
Data Source
AI summary
A circuit arrangement for driving a light source, in particular, a light-emitting diode, comprises a first adjustable current path (1), that connects a terminal (BAT_IN) for a battery to a terminal (CAP_IN) for a capacitor, a second current path (2) that connects the terminal (CAP_IN) for a capacitor to a terminal (LED_OUT) for a light source, and a third adjustable current path (3) that connects the terminal (BAT_IN) for a battery to the terminal (LED_OUT) for a light source. A control unit (CTRL) is provided that has a control input (IN) and is set up to adjust current intensities (I_CHRG, I_CAP, I_DIRECT) on the first, second and third control paths (1, 2, 3), respectively, as a function of control signals (I_in) that can be applied to the control input (IN). A method for operating a light source, in particular, a light-emitting diode, is also proposed.