Michio Tokunaga

Title: Michio Tokunaga: Innovator in Current Supply Circuits

Introduction

Michio Tokunaga is a distinguished inventor based in Zushi, Japan, known for his significant contributions to the field of electrical engineering. With a total of 12 patents to his name, Tokunaga has made remarkable advancements in current supply circuits, particularly for power sources and telephone exchanges.

Latest Patents

One of Tokunaga's latest patents is a current supply circuit that comprises a DC power feed circuit exhibiting a constant current characteristic for a power source and a constant resistance characteristic for a load. This innovative design includes a first detecting circuit for monitoring load current or load voltage, a DC-DC converter circuit positioned between the power source and the DC power feed circuit, and a second detecting circuit for measuring the output voltage from the DC-DC converter circuit. The operation circuit is coupled at the input with the outputs of both detecting circuits to control the DC-DC converter circuit effectively. This control mechanism ensures that the voltage produced reflects the sum of the voltage drop across the load and a fixed voltage necessary for the operation of the DC power feed circuit.

Another notable patent is a current supply circuit specifically designed for telephone exchanges. This circuit features a current-supplying current amplifier that is series-connected between a power supply and a load, amplifying the output current of an input current supply circuit. The driving current amplifier, which controls the current-supplying current amplifier, is regulated by an output voltage detector that is parallel-connected with the load. This design allows for the adjustment of the differential mode output impedance based on frequency and ensures a small common mode output impedance. Additionally, a diode is included to prevent direct current from flowing in the opposite direction, thereby restricting current increases and enabling rapid on-off control without compromising the circuit's essential functions.

Career Highlights

Throughout his career, Michio Tokunaga has worked with prominent companies such as Hitachi, Ltd. and Nippon Telegraph and Telephone Public Corporation. His experience in these organizations has significantly influenced his innovative work in electrical engineering.

Collaborations

Tokunaga has collaborated with notable coworkers, including Ichiro Ohhinata and Shinzi Okuhara, contributing to various projects that have advanced the field of current supply circuits.

Conclusion

In summary, Michio Tokunaga is a prominent inventor whose work in current supply circuits has led to