LED Lighting Device Dynamic Control Power Supply
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Solution Overview
Problem
Conventional LED lighting devices face challenges in covering a wide range of load voltages (22.5 to 47.5 volts) without increasing manufacturing costs and power loss, particularly due to the need for high-voltage circuitry and increased power loss from current-limiting resistors.
Innovation Solution
An LED lighting device with a power source unit that steps down DC input voltage, a control unit for adjusting output voltage, and a control power source unit featuring a current-limiting resistor with a switching mechanism to adjust resistance values based on output voltage, allowing for efficient power supply across a wide voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the winding number of the auxiliary coil is increased to supply control power to high-voltage control circuits, then the control power can be supplied, but the coupling coefficient effect becomes remarkable and an oscillatory waveform is superimposed on the switching element current
Solution Approach 1:
The patent changes the operating parameters of the auxiliary coil by controlling the switching element to adjust the effective winding number dynamically. This allows the system to adapt to different load conditions without fixing the winding number at a high value that would cause oscillations. The switching element modulates the auxiliary coil's effective inductance, enabling stable control power supply across varying operating conditions while avoiding the harmful oscillatory waveforms associated with fixed high winding numbers.
2Adaptability or versatility
If high-voltage circuitry is used to cover a wide range of load voltages, then the voltage range can be covered, but the manufacturing cost increases
Solution Approach 1:
The patent implements a dynamic control mechanism where the switching element adjusts the auxiliary coil's effective winding number based on operating conditions. This dynamic adjustment allows the system to cover a wide voltage range (22.5V to 47.5V) without requiring fixed high-voltage circuitry designed for the maximum voltage. The controlled variation in effective inductance enables the same hardware to efficiently operate across different voltage levels, reducing manufacturing costs compared to designing for worst-case high-voltage conditions.
Solution Approach 2:
The patent uses parameter changes through controlled switching to adjust the auxiliary coil's effective winding number. By dynamically modifying this parameter rather than designing for fixed high-voltage conditions, the system achieves wide voltage range coverage without proportionally increasing manufacturing complexity or cost.
3Device complexity
If a fixed current-limiting resistor is used in the control power supply circuit, then the circuit is simple, but power loss increases when operating at high voltages
Solution Approach 1:
The patent introduces a dynamic switching mechanism that adjusts the current-limiting resistor's effective value based on operating conditions. The switching element controls the connection state of the resistor, allowing the circuit to adapt the resistance value in real-time. This dynamic adjustment reduces power loss at high voltages by optimizing the current-limiting resistance according to the actual operating voltage, while maintaining circuit simplicity through the use of a single resistor that is switched rather than multiple fixed resistors.
Solution Approach 2:
The switching element periodically or dynamically changes the state of the current-limiting resistor based on operating conditions. This periodic or dynamic action allows the resistor to be effectively adjusted without requiring a completely different resistor for each operating condition, maintaining circuit simplicity while reducing power loss through timely resistance adjustment.
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
The solution enables efficient operation across a wide range of load voltages while minimizing manufacturing costs and power loss, as the resistance value of the current-limiting resistor is adjusted dynamically to match varying output voltages, ensuring stable power supply to the control unit.
Implementation Method 1
a power source unit (1) for stepping down a DC input voltage to a predetermined DC output voltage and supplying the DC output voltage to a light-emitting diode
Implementation Method 2
a current-limiting resistor (40) for limiting an electric current that flows from the power source unit (1) to the control unit (2)
Data Source
AI summary
An LED lighting device includes: a power source unit for supplying the DC output voltage to a light-emitting diode; a control unit for adjusting the DC output voltage; and a control power source unit for supplying a control power to the control unit. The control power source unit generates the control power with the DC output voltage and has: a current-limiting resistor for limiting an electric current that flows from the power source unit to the control unit; a constant voltage unit for converting a voltage to be applied to the control unit through the current-limiting resistor unit to a constant voltage; and a switching unit for switching a resistance value of the current-limiting resistor unit among a plurality of resistance values.