LED Lighting and Plasma Control Circuit for Independent Power Switching
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Solution Overview
Problem
Existing control systems with lighting and plasma generation functions suffer from increased power consumption due to simultaneous operation of both functions, reduced power efficiency, and decreased sterilization effectiveness due to electrode deposition, necessitating individual control and nozzle cleaning.
Innovation Solution
A control system with a power conversion unit, lighting control unit, photocoupler unit, oscillation frequency generation unit, and high voltage supply unit, allowing individual control of lighting and plasma generation functions, using a PWM buck step-down constant current control circuit and corona discharge to generate plasma wind for sterilization and deodorization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If rectification circuits and power conversion circuits are shared between LED converter and plasma generator, then device complexity is reduced, but individual control capability is lost and power consumption increases
Solution Approach 1:
The patent divides the power conversion system into separate rectification circuits and power conversion circuits for the LED converter and plasma generator. Each function has its own dedicated circuit path, enabling independent control while maintaining manageable system complexity through functional segmentation.
Solution Approach 2:
The control system incorporates a universal power input interface that can supply power to both the LED converter and plasma generator through different circuit paths. The system can operate in multiple modes (lighting only, plasma generation only, or both simultaneously) using the same basic power input infrastructure.
2Device complexity
If rectification circuits and power conversion circuits are shared between LED converter and plasma generator, then device complexity is reduced, but power efficiency deteriorates due to simultaneous operation
Solution Approach 1:
The patent implements separate rectification and power conversion circuits that can be independently activated. This allows the system to operate only the necessary function (lighting or plasma generation) at any given time, preventing energy waste from simultaneous operation while keeping the overall circuit architecture relatively simple.
Solution Approach 2:
The control system dynamically switches between different circuit configurations based on operational requirements. The switches can connect the power input to either the LED converter circuit or the plasma generator circuit, enabling adaptive power management that optimizes energy efficiency according to real-time needs.
3Reliability
If plasma is generated continuously, then sterilization effectiveness is maintained, but electrode deposition increases and sterilization performance deteriorates
Solution Approach 1:
The patent implements periodic plasma generation cycles with intervals of non-operation. During these intervals, the electrodes are allowed to cool and deposition is reduced. The system alternates between plasma generation phases (for sterilization) and rest phases (for deposition reduction), maintaining sterilization effectiveness over time while managing electrode degradation.
Solution Approach 2:
The system periodically discontinues plasma generation to allow electrode recovery and minimize deposition accumulation. By strategically pausing operation, the system recovers electrode performance and reduces harmful deposition effects, thereby extending the effective operational lifespan of the plasma generation function.
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
The system achieves reduced power consumption, effective sterilization and deodorization through individual control of lighting and plasma functions, and prevents performance deterioration by facilitating easy nozzle cleaning.
Implementation Method 1
a power conversion unit configured to convert an AC power into a DC power such that a power ripple twice a frequency of a full-wave rectified input power is generated
Implementation Method 2
a plasma electrode configured to receive an amplified high voltage to generate plasma by corona discharge
Data Source
AI summary
Disclosed is a control system having a lighting function and a plasma generation function, including: a power conversion unit configured to convert an AC power into a DC power; a lighting control unit configured to control turning on and off of an LED lighting lamp; a photocoupler unit including a first photocoupler electrically connected to the power conversion unit and the lighting control unit, and a second photocoupler electrically connected to the power conversion unit to detect a full-wave rectified DC power; an oscillation frequency generation unit electrically connected to the second photocoupler; a plasma electrode configured to receive an amplified high voltage to generate plasma; and a high voltage supply unit electrically connected to receive the oscillation frequency to induce a high voltage, and amplify the induced high voltage to supply the induced high voltage to the plasma electrode.