Novel zero ripple DC current transformer design

Author

Li-Ling Lee

Author_Institution

Ind. Technol. Res. Inst., Hsinchu

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3514

Lastpage

3516

Abstract

A new circuit of DC ripple-free current transformer (DCCT) is proposed to achieve the high-accuracy, the high-speed, the high-reliability and the no hysteresis effect in sensing of current for power electronic applications. This DCCT consists of two phase (opposite phase) transistor-core-based multivibrators synchronized to clock pulses with built-in oscillators. In this paper, the operating principle and experimental results, both on static and dynamic characteristics are presented. Moreover, the response time of 2 μsec under 3 kHz of clock pulse is also reported

Keywords

current transformers; electric current measurement; machine vector control; multivibrators; saturable core reactors; transformer cores; transformer magnetic circuits; 2 mus; 3 kHz; built-in oscillators; current sensing; dynamic characteristics; high-accuracy; high-reliability; high-speed; motor control; operating principle; power electronics; saturable core; static characteristics; synchronized to clock pulses; transformer circuit design; transistor-core-based multivibrators; two phase clock pulses; wide dynamic range; zero ripple DC current transformer; Clocks; Current transformers; Frequency; Magnetic hysteresis; Magnetic sensors; Pulse circuits; Pulse transformers; Sensor phenomena and characterization; Transformer cores; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800574

Filename

800574