Rohm and Haas Electronic Materials Korea Ltd.

Ls Industrial Systems Co., Ltd.

Kyung Joo Lee

Doo-Hyeon Moon

Su-Hyun Lee

Kyoung-Jin Park

Hee-Choon Ahn

Nam-Kyun Kim

Young-Jun Cho

Hyuck Joo Kwon

Hyo-Nim Shin

Bong-Ok Kim

Seok Keun Yoon

Hee Sook Kim

The present invention relates to a novel organic electroluminescent compound, layer and an organic electroluminescent device using the same. Said organic luminescent compound provides an organic light emitting layer and/or device which has high luminous efficiency and a long operation lifetime and requires a low driving voltage improving power efficiency and power consumption.

Organic electroluminescent compounds, layers and organic electroluminescent device using the same

The present invention previously sets a threshold voltage, compares the set threshold voltage with a reference voltage, and judges whether a minimal pulse width of a PWM signal is obtained. When a pulse width of one PWM signal is equal to or greater than the minimal pulse width, but each pulse width of two PWM signals is less than the minimal pulse width, a sine wave voltage corresponding to one of the two PWM signals less than the minimal pulse width is varied to a threshold voltage to detect two phase currents, and a remaining one phase current is calculated based on the two detected phase currents. After the phase current was detected by varying the threshold voltage, a level difference between an original sine wave voltage and the threshold voltage is set as a compensation voltage, and the sine wave voltage is compensated by the compensation voltage.

Apparatus and method for detecting phase currents of inverter

Growing community of inventors

Gyeonggi-do, South Korea

Kyung Joo Lee