LED Driving Device With Ripple Current Reducers
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Solution Overview
Problem
Conventional LED driving devices have complex circuit configurations due to microcomputer-based color control, making them expensive and inefficient, especially when performing color control operations for LED lighting apparatuses.
Innovation Solution
An LED driving device with a simple circuit configuration that converts AC input power to DC output power, using a switching element, ripple current reducers, and a control circuit to manage LED loads of different colors, achieving reciprocal color control without a microcomputer by varying current values in a seesaw manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a microcomputer is used to control color control operation in LED driving devices, then color control functionality is achieved, but circuit complexity increases and manufacturing cost increases
Solution Approach 1:
The patent extracts and removes the microcomputer from the LED driving device, replacing it with a simplified control circuit that uses basic electronic components (comparators, resistors, capacitors) to achieve color control functionality through PWM signal generation and duty cycle adjustment, thereby eliminating the complexity and cost associated with microcomputer-based control while maintaining the essential color control capability
Solution Approach 2:
The patent replaces the expensive microcomputer with inexpensive, simple electronic components that can be easily manufactured and replaced. The control circuit uses basic analog components rather than complex integrated circuits, significantly reducing manufacturing cost and device complexity while achieving the required color control function
2Adaptability or versatility
If a microcomputer is used to control color control operation in LED driving devices, then color control functionality is achieved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and removes the microcomputer from the LED driving device, replacing it with a simplified control circuit that uses basic electronic components (comparators, resistors, capacitors) to achieve color control functionality through PWM signal generation and duty cycle adjustment, thereby eliminating the complexity and cost associated with microcomputer-based control while maintaining the essential color control capability
Solution Approach 2:
The patent replaces the expensive microcomputer with inexpensive, simple electronic components that can be easily manufactured and replaced. The control circuit uses basic analog components rather than complex integrated circuits, significantly reducing manufacturing cost and device complexity while achieving the required color control function
3Device complexity
If ripple current is not reduced in LED loads, then circuit configuration remains simple, but LED lifespan decreases and performance deteriorates
Solution Approach 1:
The patent introduces an intermediary component (ripple current reduction circuit) between the power supply and LED loads that filters and smooths the current waveform. This intermediary circuit reduces high-frequency ripple current while maintaining the overall simplicity of the LED driving device, thereby protecting LED lifespan without significantly complicating the circuit configuration
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 enables cost-effective and efficient color control in LED lighting apparatuses with a reduced circuit complexity, improving power factor and minimizing current ripples, while maintaining the total LED current value for color control.
Implementation Method 1
a switching element configured to be controlled for on-off operation thereof
Implementation Method 2
a plurality of ripple current reducers series-connected to the respective LED loads and configured to reduce current ripples flowing through the respective LED loads
Implementation Method 3
Each of the ripple current reducers has a feedback-type constant current control circuit configured to perform control for varying impedance
Data Source
AI summary
The present invention supplies desired DC output power to a first LED load and a second LED load whose color temperature is different from that of the first LED load, includes a switching element, ripple current reducers series-connected to the respective LED loads and for reducing current ripples flowing through the LED loads, and a control circuit for controlling the DC output power so that it has a predetermined value, by performing on-off control of the switching element based on a feedback voltage at a connecting point between each of the LED loads and a corresponding one of the ripple current reducers. Each ripple current reducer has feedback-type constant current control circuits for performing control for varying impedance, and the present invention also includes color controllers for performing color control by maintaining a total LED current value of the first and second LED loads at a certain value.