UV Irradiation Device Drive Current Compensation
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Solution Overview
Problem
Ultraviolet irradiation devices face a reduction in output when one or more light emitting devices fail, leading to insufficient sterilization or treatment efficacy, as the remaining devices compensate by reducing illuminance and wavelength distribution, affecting the performance of the device.
Innovation Solution
A UV irradiation device with a light source unit, drive circuit, sensing unit, and controller that detects issues in light emitting devices and adjusts the drive current of functioning devices to maintain output, ensuring consistent illuminance and wavelength distribution by compensating for failing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple light emitting devices are used to maintain output when one fails, then reliability is improved, but device complexity increases
Solution Approach 1:
The control unit continuously monitors the output of each light emitting device and adjusts the drive current in real-time based on detected variations. When one device's output decreases, the system detects this change and compensates by increasing current to other devices, maintaining overall output stability through closed-loop feedback control.
Solution Approach 2:
The drive current supplied to each light emitting device is dynamically adjusted based on real-time output conditions rather than remaining constant. The control unit modifies current levels adaptively to compensate for output variations, transforming a static system into a dynamic one that self-regulates to maintain reliability.
2Productivity
If drive current is increased to compensate for output reduction, then productivity is maintained, but energy consumption increases
Solution Approach 1:
The system changes the drive current parameter dynamically based on the operational state of light emitting devices. Instead of maintaining a fixed high current that would always consume maximum energy, the current is adjusted to the minimum necessary level to achieve the required sterilization effectiveness, reducing energy consumption while maintaining productivity.
Solution Approach 2:
The control unit ensures continuous monitoring and adjustment of drive currents to maintain effective sterilization output without interruption. By continuously optimizing the current distribution among devices, the system maintains uninterrupted productive action while minimizing energy waste through efficient real-time control.
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 solution effectively maintains performance by adjusting drive currents to prevent output reduction, ensuring continuous and effective sterilization or treatment, even when some light emitting devices fail, thereby preventing uneven illuminance and wavelength changes.
Implementation Method 1
a light source unit 10 that includes a plurality of light emitting devices 12 and outputs ultraviolet light 16 as irradiating light
Implementation Method 2
a sensing unit 30 that senses a trouble in the plurality of light emitting devices 12
Data Source
AI summary
An ultraviolet irradiation device includes a light source unit, a drive circuit, a sensing unit and a controller. The light source unit includes a plurality of light emitting devices and outputs ultraviolet light as irradiating light. The drive circuit supplies a drive current (Id) to the plurality of light emitting devices. The sensing unit senses a trouble in the plurality of light emitting devices. The controller controls the drive current (Id) in accordance with a result of sensing by the sensing unit. When an output of the light source unit is reduced due to a trouble in one or some of the plurality of light emitting devices, the controller controls the drive current (Id) of a plurality of light emitting devices other than the light emitting device in trouble so as to compensate reduction in the output of the light source unit.