Iron Device Corporation

Seoul, South Korea

Iron Device Corporation

Seoul, South Korea

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Heo S.,IT Convergence Technology Research Laboratory | Oh J.,Information and Communications Core Technology Research Laboratory | Kim M.,Information and Communications Core Technology Research Laboratory | Suk J.-H.,Information and Communications Core Technology Research Laboratory | And 3 more authors.
ETRI Journal | Year: 2015

This paper proposes a fully sensorless driver for a permanent magnet synchronous motor (PMSM) integrated with a digital motor controller and an analog pre-driver, including sensing circuits and estimators. In the motor controller, a position estimator estimates the back electromotive force and rotor position using a sliding-mode observer. In the pre-driver, drivers for the power devices are designed with a level shifter and isolation technique. In addition, a current sensing circuit measures a three-phase current. All of these circuits are integrated in a single chip such that the driver achieves control of the speed with high accuracy. Using an IC fabricated using a 0.18 Îm BCDMOS process, the performance was verified experimentally. The driver showed stable operation in spite of the variation in speed and load, a similar efficiency near 1% compared to a commercial driver, a low speed error of about 0.1%, and therefore good performance for the PMSM drive. © 2015 ETRI.


Kim M.,Information and Communications Core Technology Research Laboratory | Heo S.,IT Convergence Technology Research Laboratory | Oh J.,Information and Communications Core Technology Research Laboratory | Suk J.-H.,Information and Communications Core Technology Research Laboratory | And 3 more authors.
ETRI Journal | Year: 2015

This paper presents an advanced sensorless permanent magnet (PM) brushless motor controller integrated circuit (IC) employing an automatic lead-angle compensator. The proposed IC is composed of not only a sensorless sinewave motor controller but also an isolated gate-driver and current self-sensing circuit. The fabricated IC operates in sensorless mode using a position estimator based on a sliding mode observer and an open-loop start-up. For high efficiency PM brushless motor driving, an automatic leadangle control algorithm is employed, which improves the efficiency of a PM brushless motor system by tracking the minimum copper loss under various load and speed conditions. The fabricated IC is evaluated experimentally using a commercial 200 W PM brushless motor and power switches. The proposed IC is successfully operated without any additional sensors, and the proposed algorithm maintains the minimum current and maximum system efficiency under 0 N•m to 0.8 N•m load conditions. The proposed IC is a feasible sensorless speed controller for various applications with a wide range of load and speed conditions. © 2015 ETRI.


Oh J.,Information and Communications Core Technology Research Laboratory | Kim M.,Information and Communications Core Technology Research Laboratory | Heo S.,IT Convergence Technology Research Laboratory | Suk J.-H.,Information and Communications Core Technology Research Laboratory | And 3 more authors.
ETRI Journal | Year: 2015

This work proposes a highly efficient sensorless motor driver chip for various permanent-magnet synchronous motors (PMSMs) in a wide power range. The motor driver chip is composed of two important parts. The digital part is a sensorless controller consisting mainly of an angle estimation block and a speed control block. The analog part consists of a gate driver, which is able to sense the phase current of a motor. The sensorless algorithms adapted in this paper include a sliding mode observer (SMO) method that has high robust characteristics regarding parameter variations of PMSMs. Fabricated SMO chips detect back electromotive force signals. Furthermore, motor currentâ€"sensing blocks are included with a 10-bit successive approximation analog-to-digital converter and various gain current amplifiers for proper sensorless operations. Through a fabricated SMO chip, we were able to demonstrate rated powers of 32 W, 200 W, and 1,500 W. © 2015 ETRI.

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