LED Illumination Apparatus with Integrated Rectification and Control
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Solution Overview
Problem
Illumination apparatuses using light emitting diodes face challenges in achieving low power consumption, improved power factor, and simple structure due to the need for additional circuits to drive the LEDs effectively.
Innovation Solution
A light emitting diode illumination apparatus that includes a control circuit to selectively provide current paths and control pulse widths based on the rectified voltage, ensuring current regulation follows the voltage waveform, thereby reducing current harmonics and improving power factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional circuits are used to drive LEDs effectively, then current regulation and power factor are improved, but device complexity increases
Solution Approach 1:
The patent combines the rectification function and current regulation function into a single integrated circuit structure. The switching circuit performs both AC rectification and current control for the LED, eliminating the need for separate rectification circuits and current regulation circuits, thus reducing overall device complexity while maintaining effective current regulation.
Solution Approach 2:
The switching circuit is designed to perform multiple functions simultaneously: it rectifies the AC input voltage, regulates the current supplied to the LED, and provides power factor correction. This multi-functional approach reduces the number of separate circuits needed, thereby reducing device complexity while ensuring reliable current regulation.
2Use of energy by stationary object
If additional circuits are used to drive LEDs effectively, then power factor is improved, but device complexity increases
Solution Approach 1:
The patent merges the power factor correction function with the LED driving circuit. The switching circuit simultaneously performs power factor correction and LED current regulation by controlling the switching timing and duty cycle, eliminating the need for separate power factor correction circuits and reducing overall device complexity.
Solution Approach 2:
The switching circuit is designed as a multi-functional component that handles AC rectification, power factor correction, and LED current regulation all in one circuit. This universal approach improves power factor while avoiding the complexity increase that would result from adding separate dedicated circuits for each function.
3Object-generated harmful factors
If current regulation follows rectified voltage waveform, then current harmonics are reduced, but control complexity increases
Solution Approach 1:
The switching circuit operates in periodic cycles synchronized with the rectified voltage waveform. By switching on and off at regular intervals corresponding to the voltage waveform periods and controlling the duty cycle, the circuit achieves current regulation that follows the voltage waveform, minimizing current harmonics while using simple periodic control logic rather than complex continuous control.
Solution Approach 2:
The control circuit uses feedback from the rectified voltage waveform to adjust the switching timing and duty cycle. By monitoring the voltage waveform and providing feedback control, the system automatically regulates the current to follow the voltage waveform, reducing current harmonics while keeping the control mechanism relatively simple through automatic feedback adjustment rather than complex manual control.
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 improved current regulation, reduced current waveform distortion, and a more efficient use of commercial AC power, resulting in a simpler structure and lower power consumption.
Implementation Method 1
a light source that includes a plurality of light emitting diode channels including one or more light emitting diodes, and emits light by application of a rectified voltage
Implementation Method 2
emits light by application of a rectified voltage obtained by converting an AC voltage
Data Source
AI summary
Disclosed are a light emitting diode illumination apparatus and a control method thereof. The light emitting diode illumination apparatus includes a light source that includes a plurality of light emitting diode channels including one or more light emitting diodes, and emits light by application of a rectified voltage obtained by converting an AC voltage, and a control circuit that selectively provides current paths according to a change in a level of the rectified voltage through a plurality of switching circuits connected to the light emitting diode channels, and controls pulse widths of control pulses provided to the switching circuits such that an current supplied to the light source of each channel follows a waveform of the rectified voltage.