Field Emission Power Supply Resonant Inverter Control
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Solution Overview
Problem
Existing power supplies for field emission light sources are inefficient and bulky, with voltage multipliers causing voltage spikes that can shorten the lifespan of the light source and limiting dimming capabilities due to size and efficiency issues.
Innovation Solution
A compact power supply with a control unit connected to a resonant inverter and voltage multiplier, using feedback signals to regulate the high voltage and frequency, allowing for smooth dimming and extended lifespan by adjusting the output power and using PWM control to manage voltage spikes, with a configuration that places circuit resonance on the secondary side of the transformer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a voltage multiplier with a large plurality of steps is used to provide high voltage for the field emission light source, then the required high voltage output (2-12 kV) is achieved, but the size of the power supply increases and efficiency decreases
Solution Approach 1:
The patent changes the operating parameters of the voltage multiplier by optimizing the number of stages and the capacitance values to reduce voltage spike magnitude while maintaining the required 2-12 kV output. This allows achieving the necessary high voltage without requiring an excessive number of multiplier stages, thereby reducing the power supply size.
Solution Approach 2:
The control unit continuously monitors the output voltage and current from the voltage multiplier and adjusts the resonant inverter operating parameters in real-time to minimize voltage spikes. This feedback mechanism enables the system to maintain stable high voltage output while preventing harmful voltage transients, eliminating the need for oversized protective components.
2Power
If a voltage multiplier with a large plurality of steps is used to provide high voltage, then the required voltage level is achieved, but the efficiency of the power supply decreases
Solution Approach 1:
The patent optimizes the voltage multiplier stage parameters and resonant inverter frequency to minimize energy losses. By carefully selecting the operating point and adjusting the resonant frequency, the system achieves high voltage conversion efficiency while maintaining the required 2-12 kV output level.
Solution Approach 2:
The control unit uses feedback from voltage and current sensors to dynamically adjust the resonant inverter switching frequency and duty cycle, maximizing power transfer efficiency and minimizing losses in the voltage multiplier stages while maintaining the required high voltage output.
3Device complexity
If voltage spikes are not controlled in high voltage applications, then the power supply can be simpler, but the lifetime of the field emission light source is effectively limited and may burn out
Solution Approach 1:
The control unit continuously monitors the voltage multiplier output and uses feedback control to adjust the resonant inverter parameters, preventing voltage spikes that would damage the light source. This active control approach provides reliable protection without requiring complex passive suppression circuits.
Solution Approach 2:
The control system proactively adjusts operating parameters before damaging voltage spikes can occur by monitoring trends and preemptively modifying the resonant inverter duty cycle or frequency, preventing light source damage before it happens rather than reacting after damage occurs.
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 provides a compact, efficient power supply that minimizes light output variations, extends the lifespan of the field emission light source, and allows for precise dimming while maintaining electrical efficiency, reducing the risk of voltage spikes and improving power factor.
Implementation Method 1
an LLC resonant inverter (108) comprising a transformer, the resonant inverter connected to the output of the DC-DC converter (106) and configured to provide a pulsating signal at a first frequency having a third voltage level, the third voltage level being higher than the second voltage level
Implementation Method 2
a voltage multiplier (110) rectifying the pulsating signal to a direct current at a fourth voltage level, the fourth voltage level being higher than the third voltage level
Data Source
Figure 1~2
Figure 3a
Figure 3b
AI summary
The present invention relates to a power supply for a field emission light source. The novel power supply allows for a reduction in size as well as allowing for improvements relating to power factor and efficiency. The size reduction further allows the power supply to efficiently be integrated together with the field emission light source forming a lighting device.