Title :
Novel zero ripple DC current transformer design
Author_Institution :
Ind. Technol. Res. Inst., Hsinchu
fDate :
9/1/1999 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
