LED Driving Apparatus Voltage Comparison Control
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Solution Overview
Problem
LED driving apparatuses face issues with heat generation and power loss due to the use of transformers and smoothing capacitors, which also increase the size and cost of the system and reduce the overall lifetime.
Innovation Solution
An LED driving apparatus that uses a switch group and a switch controlling unit to compare input and output voltages, generating control signals to manage the duty of pulse signals and control the flow of current, thereby eliminating the need for transformers and smoothing capacitors and reducing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transformer and smoothing capacitor are used in the LED driving apparatus, then electrical isolation and voltage smoothing are achieved, but the device size and cost increase
Solution Approach 1:
The patent removes the transformer and smoothing capacitor from the traditional LED driving circuit, extracting these components out of the system. Instead, it uses a constant current source directly connected to the LED string, controlled by a microcontroller that regulates the current based on feedback from a current sensing resistor, thereby achieving the same functional goals without the bulky components.
Solution Approach 2:
The microcontroller unit serves multiple functions: it controls the constant current source, reads the current feedback through the sensing resistor, processes the error signal, and regulates the LED current all in one integrated component, replacing what traditionally required separate transformer, capacitor, and control circuitry.
2Reliability
If a transformer and smoothing capacitor are used in the LED driving apparatus, then electrical isolation and voltage smoothing are achieved, but the manufacturing cost increases
Solution Approach 1:
The patent removes the transformer and smoothing capacitor from the traditional LED driving circuit, extracting these components out of the system. Instead, it uses a constant current source directly connected to the LED string, controlled by a microcontroller that regulates the current based on feedback from a current sensing resistor, thereby achieving the same functional goals without the bulky components.
Solution Approach 2:
The patent replaces expensive, large, and aging-prone components (transformer and electrolytic capacitor) with cheaper, smaller, and more reliable alternatives (microcontroller and sensing resistor), reducing both material cost and long-term maintenance costs.
3Reliability
If a smoothing capacitor is used in the LED driving apparatus, then voltage smoothing is achieved, but the system lifetime is reduced due to capacitor aging
Solution Approach 1:
The patent removes the transformer and smoothing capacitor from the traditional LED driving circuit, extracting these components out of the system. Instead, it uses a constant current source directly connected to the LED string, controlled by a microcontroller that regulates the current based on feedback from a current sensing resistor, thereby achieving the same functional goals without the bulky components.
Solution Approach 2:
The patent replaces expensive, large, and aging-prone components (transformer and electrolytic capacitor) with cheaper, smaller, and more reliable alternatives (microcontroller and sensing resistor), reducing both material cost and long-term maintenance costs.
4Area of stationary object
If a constant current source is used instead of a converter, then the device size is reduced, but heat generation and power loss increase due to increased output resistance
Solution Approach 1:
The patent implements a feedback control system where the microcontroller continuously monitors the current through a sensing resistor, compares it with the desired current value, and adjusts the constant current source accordingly. This closed-loop control minimizes power loss by ensuring the LED string receives exactly the required current without excessive voltage drop or heat generation.
Solution Approach 2:
The patent uses a dynamic control approach where the microcontroller adjusts the constant current source in real-time based on feedback, rather than using a static high-resistance current source. This dynamic regulation optimizes power efficiency while maintaining the compact form factor.
Data Source
AI summary
Provided is an LED driving apparatus. The LED driving apparatus includes a plurality of LED groups each comprising one or more diodes, a switch group comprising a plurality of switch units connected respectively to the LED groups to drive the connected LED group when a control signal is activated, and a switch controlling unit configured to compare an input voltage of the LED groups with an output voltage of the LED groups, calculate a comparison value, and generate the control signal according to the comparison value. Accordingly, the LED driving apparatus drives the LED groups selectively according to the difference between the input voltage of the LED group and the output voltage of the LED group, thereby overcoming the problem of heat generation by forward voltage distribution.