Company Filing History:

15 out of 42,485

Hitachi, Ltd.

patents

2 out of 162

Hitachi Engineering Co., Ltd.

patents

1 out of 7

Hitachi Elevator Engineering & Service Co., Ltd.

patents

where one patent can have more than one assignee

Years Active: 1978-1992

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15 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5155671 - Power converter with current-type inverter (1992-10-13),

2. 4884182 - Current source power converting apparatus with overvoltage protection (1989-11-28),

3. 4833586 - PWM control for power converter system utilizing pulse dropping at (1989-05-23),

4. 4787021 - Current-type converter apparatus (1988-11-22),

5. 4779709 - Apparatus for controlling AC elevators (1988-10-25),

6. 4757436 - Current-type converter protecting apparatus (1988-07-12),

7. 4636932 - dv/dt Protection circuit device for an AC-DC converter apparatus (1987-01-13),

8. 4629034 - Elevator control apparatus (1986-12-16),

9. 4584636 - AC-to-DC power converter with improved power factor and overvoltage (1986-04-22),

10. 4553640 - Controller for elevator (1985-11-19),

11. 4361866 - Power converter apparatus (1982-11-30),

12. 4263988 - Speed control system for a motor (1981-04-28),

13. 4256204 - Safety apparatus for elevator system (1981-03-17),

14. 4133018 - Thyristor fault-detecting apparatus (1979-01-02),

15. 4099111 - Control apparatus for DC motor (1978-07-04),

Title: Takeki Ando: Innovator in Power Conversion Technology

Introduction

Takeki Ando is a prominent inventor based in Ibaraki, Japan. He has made significant contributions to the field of power conversion technology, holding a total of 15 patents. His innovative designs focus on improving the efficiency and functionality of power converters and inverters.

Latest Patents

One of his latest patents is a power converter with a current-type inverter. This invention features a converter unit that supplies output to an inverter unit through a DC reactor, allowing AC power to be delivered to a load. The design includes a mechanism to detect the ripple component of the DC input, enabling the modulation of the inverter's switching elements for PWM control. This results in a sinusoidal output free from high harmonics, thus protecting the load from their adverse effects. Another notable patent is a current source power converting apparatus with overvoltage protection. This apparatus connects an AC to DC converter with a DC to AC inverter through a DC reactor, incorporating energy absorbing devices to form a circulation circuit that manages excess voltage.

Career Highlights

Takeki Ando has worked with notable companies such as Hitachi, Ltd. and Hitachi Engineering Co., Ltd. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking advancements in power conversion technologies.

Collaborations

Throughout his career, Takeki Ando has collaborated with esteemed colleagues, including Hiromi Inaba and Toshiaki Kurosawa. These partnerships have fostered a creative environment that has led to innovative solutions in their field.

Conclusion

Takeki Ando's contributions to power conversion technology exemplify his dedication to innovation. His patents reflect a commitment to enhancing the efficiency and reliability of electrical systems. His work continues to influence the industry and inspire future advancements.

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