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    • 1. 发明申请
    • SWITCHING MODE POWER SUPPLY APPARATUS COMPRISING OVERVOLTAGE PROTECTION CIRCUIT
    • 包含过电压保护电路的开关电源装置
    • WO2013009123A3
    • 2013-06-13
    • PCT/KR2012005571
    • 2012-07-13
    • ZEPHYR LOGIC INCKIM YOUNG-SIK
    • KIM YOUNG-SIK
    • H02M1/32H02M3/28
    • H02M1/32H02M1/4225Y02B70/126
    • A switching mode power supply apparatus comprising an overvoltage protection circuit is disclosed. The overvoltage protection circuit comprises a feedback voltage comparison portion and a duty ratio adjustment portion. The feedback voltage comparision portion compares a feedback voltage, which is detected from an output end of the switching mode power supply apparatus, and a referece voltage, which is predetermined to be smaller than an overvoltage that is set with respect to the switching mode power supply apparatus, and the duty ratio adjustment portion reduces a switching duty ratio of the switching mode power supply apparatus when the feedback voltage is higher than the reference voltage. By adjusting an on/off switching ratio of a power device in advance when the feedback voltage exceeds the reference voltage that is lower than the overvoltage, instead of suddenly maintaining the switch of the power device to off when the feedback voltage reaches the overvoltage, an output voltage can be prevented in advance from becoming an overvoltage, and system stability can also be enhanced.
    • 公开了一种包括过电压保护电路的开关模式电源装置。 过压保护电路包括反馈电压比较部分和占空比调整部分。 反馈电压比较部分将从开关模式电源装置的输出端检测到的反馈电压与预定为小于相对于开关模式电源设定的过电压的参考电压进行比较 装置和占空比调节部分当反馈电压高于参考电压时降低开关模式电源装置的开关占空比。 当反馈电压超过低于过电压的参考电压时,预先调节功率器件的开/关切换比,而不是在反馈电压达到过电压时突然保持功率器件的开关截止, 可以提前防止输出电压变得过电压,并且还可以提高系统的稳定性。
    • 4. 发明专利
    • PHASED ARRAY ANTENNA HAVING THE HIGHEST EFFICIENCY AT SLANT ANGLE
    • CA2610577A1
    • 2006-12-14
    • CA2610577
    • 2006-06-07
    • LEE SANG-WONLEE YONG-KIVEHICLE SYSTEM INCKIM YOUNG-SIK
    • LEE SANG-WONLEE YONG-KIKIM YOUNG-SIK
    • H01Q21/00
    • The present invention relates to a phased array antenna, which is configured such that a plurality of radiation elements, having high reception efficiency for radio waves incident at a tilt angle, is arranged in a plurality of rows and columns, thus attaining high reception efficiency, and which adjusts radio waves, incident through a radome for protecting the antenna, to a desired tilt angle, thus further increasing radio wave reception efficiency. For this purpose, the present invention includes a printed circuit board provided with a plurality of electrical and electronic devices for processing radio waves received from a satellite; and a plurality of radiation elements arranged and mounted on the printed circuit board in a plurality of rows and columns, formed such that the radiation characteristic for the received radio waves is maximized at the tilt angle, and formed in a helical or monopolar form to be optimized for the radio waves received at the tilt angle. Furthermore, the present invention is configured such that a radome through which the radio waves pass is installed outside the printed circuit board on which the radiation elements are mounted, wherein, in order to allow radio waves, passing through and refracted, to be converged at the tilt angle at which the reception efficiency of the radiation elements is maximized, an uneven surface is formed on the inner or outer surface of the radome. Furthermore, in order to allow the radio waves, passing through and refracted, to be maintained at the tilt angle at which the reception efficiency of the radiation elements is maximized, the radome includes a sidewall member provided on the sides of the printed circuit board, and a cover member configured to be connected to the upper portions of the sidewall member and to be lifted and lowered upward and downward from the sidewall member, wherein a lifting drive unit for selectively lifting and lowering the cover member is installed on the sidewall member and the cover unit.