LED Control Circuit Rectified Voltage Sensing
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Solution Overview
Problem
Conventional LED lighting apparatuses face challenges in maintaining uniform luminance due to varying and unstable power supply environments, which can result in reduced light emission and non-uniform brightness.
Innovation Solution
A control circuit for LED lighting apparatuses that includes a rectified voltage sensing unit, a control unit, and a rectified voltage compensation circuit to adjust current paths and reference voltages based on sensed rectified voltage levels, ensuring consistent light emission across different power supply conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LED lighting apparatus uses a conventional constant current drive circuit, then the LED can be driven with stable current, but the circuit complexity increases due to requiring additional inductors and capacitors
Solution Approach 1:
The patent extracts and removes the inductor and capacitor components from the conventional constant current drive circuit, replacing them with a simplified switching circuit that uses the rectified voltage directly to control LED current without requiring traditional power factor correction components
Solution Approach 2:
The patent replaces the mechanical/electrical components (inductors and capacitors) with an electronic control system that uses switching elements and control circuits to achieve current regulation, eliminating the need for bulky passive components
2Device complexity
If the LED lighting apparatus directly uses rectified voltage without compensation, then the circuit simplicity is maintained, but the luminance uniformity deteriorates under varying power supply conditions
Solution Approach 1:
The patent introduces a feedback control mechanism where the control circuit monitors the rectified voltage level and adjusts the switching duty cycle accordingly, creating a closed-loop system that maintains stable LED current and uniform luminance despite variations in input voltage
Solution Approach 2:
The patent implements dynamic adjustment of the switching circuit parameters based on the instantaneous rectified voltage level, allowing the circuit to adapt its operation in real-time to maintain constant current through the LEDs regardless of power supply fluctuations
3Adaptability or versatility
If the LED lighting apparatus operates in unstable power supply environments, then the adaptability to different environments is improved, but the luminance uniformity deteriorates due to voltage drops
Solution Approach 1:
The patent changes the operating parameters of the switching circuit dynamically based on the input voltage level, adjusting the duty cycle and switching frequency to compensate for voltage drops and maintain stable LED operation across different power supply environments
Data Source
AI summary
Disclosed is a control circuit of an LED lighting apparatus, which compensates for power for light emission of a lamp including LEDs. The control circuit can generate a compensation signal corresponding to change of power provided to the lamp, and uniformly maintain the power by controlling a current provided to the lamp in response to the compensation signal. Thus, the control circuit can compensate for the power change of the lamp due to a power supply environment factor in a building, region, or country or a temporarily unstable power supply environment factor, such that the lamp can emit light at uniform luminance.