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An isolation power supply by phototransmission
K Takahashi1, K Izawa, T Morimoto
1Electronic Engineering, Faculty of Engineering, Saitama University, Japan.
Frontiers of Medical and Biological Engineering : the International Journal of the Japan Society of Medical Electronics and Biological Engineering
|January 1, 1992
Summary
This study introduces an isolation power supply using phototransmission, achieving 3.9% conversion efficiency. A feedback system maintains peak efficiency across various loads and input powers, ensuring stable operation with low noise.
Area of Science:
- Electrical Engineering
- Optoelectronics
- Power Electronics
Background:
- Isolation power supplies are crucial for electrical safety and noise reduction.
- Phototransmission offers a novel method for achieving electrical isolation.
- Optimizing conversion efficiency in phototransmission-based supplies is essential for practical applications.
Purpose of the Study:
- To propose and evaluate an isolation power supply utilizing phototransmission.
- To determine the conversion efficiency and electrical characteristics of a prototype unit.
- To investigate methods for maintaining stable performance under varying conditions.
Main Methods:
- Utilizing infrared light-emitting diodes (LEDs) as light sources and single-silicon-crystal solar cells as photovoltaic cells.
- Implementing a constant output voltage feedback system to control LED driving current.
- Employing a liquid-cooling structure to manage temperature and maintain efficiency.
- Measuring conversion efficiency and electrical properties of the fabricated prototype.
Main Results:
- Achieved a maximum conversion efficiency of 3.9%.
- Demonstrated that the feedback system maintains maximum conversion efficiency irrespective of load variations.
- Showcased that the liquid-cooling system ensures nearly constant efficiency across different input power levels.
- Observed minimal capacitive leakage current and negligible internal noise in the fabricated supply.
Conclusions:
- The proposed phototransmission isolation power supply demonstrates viable performance.
- The integrated feedback and cooling systems effectively enhance operational stability and efficiency.
- The prototype exhibits desirable characteristics for applications requiring high isolation and low noise.