Selective Power Supply for Incandescent and LED Lighting
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Solution Overview
Problem
Existing power supply devices for both incandescent lamps and LED lighting systems face challenges due to high inrush currents, leading to bulky and inefficient designs, as they need to be dimensioned to handle peak currents, which are not compatible with pulse width modulation techniques and result in excessive bulk and external components.
Innovation Solution
A power supply device with a supply transistor that can be reconfigured to operate in different modes for incandescent lamps and LED modules, using a driving means to generate specific command signals for ohmic, pulse width modulation, and saturated regimes, optimizing the device for reduced bulk and efficient current handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply device is dimensioned to handle high inrush currents for incandescent lamps, then the lamp can be activated reliably, but the device size and component bulk increase significantly
Solution Approach 1:
The power supply device dynamically adapts its operating regime based on the detected lamp type. For incandescent lamps, it switches to ohmic regime during activation to handle high inrush currents, then transitions to PWM regime during normal operation. For LED modules, it uses saturated regime with current limiting. This dynamic adaptation allows the device to handle different current requirements without being permanently oversized.
Solution Approach 2:
The invention changes the electrical parameters (voltage, current, resistance) of the power supply device based on the detected lamp type. By detecting whether an incandescent lamp or LED module is connected, the device adjusts its output characteristics accordingly, allowing efficient operation in both modes without requiring components sized for the worst-case scenario.
2Weight of stationary object
If PWM technique is used to reduce power supply module size, then component bulk is reduced, but the technique is incompatible with LED blocks requiring current limiting
Solution Approach 1:
The power supply device dynamically selects between PWM regime and saturated current-limiting regime based on the detected lighting type. This dynamic switching enables the device to use space-efficient PWM for incandescent lamps while providing appropriate current limiting for LED modules, achieving both size reduction and versatility.
Solution Approach 2:
The invention makes the power supply device universal by enabling it to perform multiple functions: PWM dimming for incandescent lamps, current limiting for LED modules, and residual current management. The detection mechanism identifies the connected lighting type and configures the device accordingly, allowing one device to serve multiple lighting technologies effectively.
3Use of energy by moving object
If external on/off switch is used to disconnect power supply from LED blocks, then residual current consumption is reduced, but high inrush current during switching on requires larger external components
Solution Approach 1:
The invention merges the on/off switching function with the power supply device itself, eliminating the need for separate external switches and decoupling capacitors. The power supply device integrates detection, switching, and current management capabilities, reducing external component requirements while maintaining the ability to disconnect power and manage residual currents.
Solution Approach 2:
The power supply device performs self-service by automatically detecting the connected lighting type and configuring its operation accordingly. It manages its own switching, current limiting, and power disconnection functions without requiring external control components, simplifying the overall system architecture.
Data Source
AI summary
The power supply device comprises a supply transistor commanded by a command signal and providing electric power to a lighting module, and a driving means configured to selectively generate, depending on an instruction signal representative of the structure of said at least one lighting module, a first command signal able to command the supply transistor into an ohmic regime, a second command signal able to command the supply transistor into a pulse width modulation regime involving an alternation of ohmic regimes and blocked regimes, and a third command signal able to command the supply transistor into a saturated regime.