LED Power Supply with Controllable Switch for Wide Voltage Range
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Solution Overview
Problem
Existing LED power supplies face challenges in providing a wide range of output voltage to accommodate various LED module specifications, as they need to adapt to different load requirements while maintaining efficiency and minimizing power loss.
Innovation Solution
The LED power supply device employs a resonant circuit structure with a primary and secondary winding, a charge-pump capacitor, a bridge rectifier circuit, and a unidirectional controllable power switch, allowing it to operate in different modulation modes to adjust the output voltage. This configuration includes an isolated transformer, a primary circuit, and a secondary circuit with a bridge rectifier circuit and an output capacitor, enabling the device to switch between normal and doubled output voltage levels by selectively turning the unidirectional controllable power switch on or off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a resonant circuit structure is used to achieve smaller size and higher efficiency, then power conversion efficiency is improved and device size is reduced, but the ability to provide wide-range input and output voltage is limited
Solution Approach 1:
The patent applies dynamics by making the rectifier circuit configurable between two operational modes through the controllable switch. In first mode, the switch is off and the circuit operates with standard rectification; in second mode, the switch is on and enables charge-pump doubling functionality. This dynamic reconfiguration allows the same hardware to adapt to different voltage requirements without sacrificing resonant circuit efficiency benefits.
Solution Approach 2:
The patent changes the operational parameters of the rectifier circuit by altering the state of the controllable switch. When the switch transitions between on and off states, it changes the effective circuit topology, enabling the output voltage to be adjusted between different levels. This parameter change approach allows wide-range voltage adaptation while maintaining the efficient resonant power conversion.
2Adaptability or versatility
If multiple active switching elements are used to achieve wide-range output voltage, then voltage adaptability is improved, but device complexity and control difficulty increase
Solution Approach 1:
The patent implements universality by designing a single controllable switch that performs multiple functions: it operates as an off-state element during normal rectification and as an on-state element during charge-pump operation. This multi-functional approach eliminates the need for multiple dedicated switching elements, reducing device complexity while maintaining wide-range voltage adaptability.
Solution Approach 2:
The patent extracts the voltage regulation function from a complex multi-switch system and consolidates it into a single controllable switch working in conjunction with the existing bridge rectifier components. By taking out the essential control function and implementing it with minimal additional components, the design achieves wide voltage range with reduced complexity.
3Adaptability or versatility
If a unidirectional controllable power switch is added to enable mode switching, then output voltage flexibility is improved, but device complexity increases
Solution Approach 1:
The patent merges the controllable switch with the existing bridge rectifier circuit, where the switch is integrated into the rectifier topology rather than being a separate standalone component. This merging approach allows the switch to work in conjunction with existing diodes and capacitors to achieve mode switching, minimizing the increase in overall device complexity while maximizing voltage flexibility.
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 the LED power supply to provide a wide range of output voltage efficiently, reducing unnecessary power loss and simplifying control, as it does not require multiple active switching elements or dead time configuration, thereby meeting the voltage requirements of different LED modules with minimal frequency variation.
Implementation Method 1
an isolated transformer including a primary winding and a secondary winding, a primary circuit electrically coupled to the primary winding of the isolated transformer and configured to provide the primary current according to a dc input voltage. The secondary winding is configured to provide a secondary current in response to a primary current flowing through the primary winding.
Implementation Method 2
LED power supply device employs a resonant circuit structure with a primary and secondary winding
Data Source
AI summary
An LED power supply device includes a primary winding, a secondary winding, a charge-pump capacitor, a bridge rectifier circuit, a unidirectional controlled switch, and an output capacitor. The secondary winding includes a first terminal and a second terminal and configured to provide a secondary current in response to a primary current flowing through the primary winding. A first terminal of the charge-pump capacitor is coupled to the second terminal of the secondary winding. The bridge rectifier circuit is coupled to the first terminal of the secondary winding and a second terminal of the charge-pump capacitor. The unidirectional controlled switch is reversely coupled to one of multiple diodes in the bridge rectifier circuit, and configured to be on or off according to a control voltage selectively. The output capacitor is coupled to the bridge rectifier circuit and configured to provide an output voltage according to the secondary current.