LED Lighting Apparatus with Phase-Shifted Boosting Circuits
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Solution Overview
Problem
Conventional LED lighting apparatuses using a boosting type DC/DC converter experience intermittent current flow through LEDs, leading to intermittent light emission and the stroboscopic phenomenon, especially in vehicle lighting applications, and require large-capacitance smoothing capacitors, which hinder miniaturization and increase costs.
Innovation Solution
A light-emitting diode lighting apparatus with multiple boosting circuits connected in parallel, where each circuit outputs current alternately to prevent zero current flow through LEDs, eliminating the need for large-capacitance smoothing capacitors and simplifying the circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single boosting circuit is used to supply current to LEDs connected in series, then the circuit configuration is simplified, but the current flow becomes intermittent causing stroboscopic phenomenon
Solution Approach 1:
The single boosting circuit is segmented into multiple boosting circuits (first and second boosting circuits) that operate in parallel. Each circuit handles a portion of the current supply to the LEDs, ensuring that when one circuit is in its discharge phase, the other is in its charging phase, thereby maintaining continuous current flow and eliminating the stroboscopic phenomenon while keeping each individual circuit relatively simple
2Reliability
If a large-capacitance smoothing capacitor is used to maintain continuous current, then lighting continuity is improved, but the apparatus size and cost increase
Solution Approach 1:
The current supply function is segmented across multiple boosting circuits operating in parallel with phase shifts. This segmentation allows the system to achieve continuous current output without relying on a single large-capacitance smoothing capacitor, thereby reducing the apparatus size and cost while maintaining lighting continuity
Solution Approach 2:
The multiple boosting circuits operate with periodic phase shifts relative to each other. The first boosting circuit operates during a first period while the second boosting circuit operates during a second period, creating a complementary periodic action that ensures continuous current flow through the LEDs without requiring large energy storage capacitors
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 configuration ensures continuous current flow through LEDs, preventing intermittent light emission and the stroboscopic phenomenon, while reducing the size and cost of the apparatus by eliminating the need for large capacitors and simplifying the circuit.
Implementation Method 1
a first boosting circuit for boosting a voltage of a power supply; and a second boosting circuit for boosting the voltage of the power supply
Implementation Method 2
a light emitting section having a plurality of light-emitting diodes connected in series
Data Source
AI summary
A light emitting diode apparatus that includes a single DC/DC converter section that has two circuits connected in parallel: a flyback type boosting circuit and a boosting circuit. The former includes a transformer and a switching device and the like to boost DC voltage of a DC power supply, and the latter includes a transformer and a switching device and the like to do likewise. A control section carries out switching control of the switching devices and in such a manner that shifts from each other the phases of current Ida and current Idb to be supplied from the two boosting circuits and to a plurality of LED and the like connected in series in a light emitting section.