Ming Li Chen

Title: Ming Li Chen and a Photoelectronic Frequency Modulator

Introduction

Ming Li Chen is an inventor associated with Hsin Chu, Taiwan. His listed patent describes a circuit that converts the difference between two light intensities into a frequency-modulated output. Chen is associated with the National Science Council.

Latest Patents

Chen’s listed patent, “Two Light Intensities Difference Convert into Frequency Modulator,” presents a photoelectronic circuit using two photodiodes connected in parallel with transistors and an adjustable current source. The difference between the photodiodes’ photocurrents combines with the current source’s output to charge a capacitor.

An automatic comparator monitors the capacitor voltage. Below a preset threshold, the circuit charges the capacitor; once the voltage reaches that threshold, an RS flip-flop switches the transistor to discharge it. Repeating this cycle produces a frequency-modulated output whose frequency responds to the difference in light intensity and the combined current.

The adjustable current source can compensate for an imbalance between the photodiodes’ dark currents and set the circuit’s central frequency. The patent lists 1 patent for Chen.

Career Highlights

Chen’s documented invention focuses on frequency control in photoelectronic systems. The design offers a way to represent changes in light intensity as changes in output frequency.

Collaborations

Chen’s listed coworkers include Jui I Tsai and Keh Shium Liu. His association with the National Science Council provides the organizational context for the invention.

Conclusion

Ming Li Chen’s patent describes a photoelectronic frequency modulator that uses differences in light intensity to control its output frequency, with an adjustable current source supporting calibration and dark-current compensation.