DC Stabilizer Pulse Control for LED Current Stability
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Solution Overview
Problem
Existing LED light sources fail to stabilize voltage drop at the DC stabilizer, leading to lower dissipation power and reduced efficiency when load impedance varies, particularly in circuits with variable loads.
Innovation Solution
The apparatus includes a DC voltage source, a DC stabilizer, a load, a DC-to-pulse voltage converter, a pulse-to-DC voltage converter, and a control circuit that converts constant voltage into pulse voltage, stabilizing the voltage at the DC stabilizer and maintaining constant direct current regardless of load variations by adjusting pulse duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC stabilizer is used to provide constant direct current to the load, then the current stability is improved, but the voltage drop at the DC stabilizer varies with load impedance causing increased power dissipation
Solution Approach 1:
The patent applies periodic pulse-width modulation (PWM) to control the DC stabilizer. A pulse generator produces periodic square waves that are applied to the control electrode of the stabilizer transistor. By varying the pulse width (duty cycle) while maintaining constant frequency, the system achieves continuous current regulation with reduced power dissipation compared to traditional continuous analog stabilization.
Solution Approach 2:
The patent transitions from static analog voltage stabilization to dynamic pulse-width modulation control. The DC stabilizer operates in a dynamic switching mode where the control signal parameters (pulse width) are continuously adjusted based on load conditions, enabling the system to maintain current stability while optimizing power dissipation characteristics across varying load impedances.
2Reliability
If traditional DC stabilization is used, then current regulation is achieved, but efficiency decreases due to uncontrolled voltage drop and power dissipation
Solution Approach 1:
The system employs periodic PWM signals for controlling the DC stabilizer, replacing continuous analog control. This periodic switching approach reduces the average power dissipation in the stabilizer while maintaining effective current regulation, thereby improving overall system efficiency.
Solution Approach 2:
The patent replaces traditional continuous analog stabilization mechanisms with electronic pulse-width modulation control. This substitution enables more efficient energy management by using digital-like switching control instead of continuous analog adjustment, reducing resistive losses and improving conversion efficiency.
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 effectively stabilizes voltage and current at the DC stabilizer, reducing power dissipation and enhancing efficiency by maintaining constant direct current and voltage stability across varying loads.
Implementation Method 1
a DC-to-pulse voltage converter (2) connected by its inputs to DC voltage source (1) outputs, a pulse-to-DC voltage converter (10) connected by its inputs to DC-to-pulse voltage converter (2) outputs and by its output—to a first control input of the DC-to-pulse voltage converter
Implementation Method 2
a pulse-to-DC voltage converter (10) connected by its inputs to DC-to-pulse voltage converter (2) outputs and by its output—to a first control input of the DC-to-pulse voltage converter
Data Source
AI summary
An apparatus for producing constant direct load current comprises a DC voltage source (DCVS), a DC-to-pulse voltage converter (DCPVC), a pulse-to-DC voltage converter (PDCVC), a DC stabilizer (DCS) and a control circuit (CC). The DCPVC is connected to the DCVC by its inputs and to the PDCVC by its outputs. A PDCVC output is connected to a DCPVC first control input and to a DCS first input, whose second input is connected to a DCVS positive output and whose first output is an apparatus output. A CC first input is connected to the PDCVC output, a CC second input is connected to a DCS second output, a CC first output is connected to a DCVS negative output, and a CC second output is connected to a DCPVC second control input. The result is stabilization of dissipation power in the stabilizer.