Sungkyunkwan University

Jae Hyung Jang

Kang Yoon Lee

Joo Young Chun

Hyung Gu Park

A protector for installation on a floor includes: a guard part comprising a contact surface portion having first screw through-holes formed therethrough, a middle portion which is coupled upward from the edge of the contact surface portion to be primarily impacted, and wing portions integrally coupled to both sides of the middle portion, respectively; a base part having third screw through-holes formed therethrough so as to be fixed to a floor surface while being brought into contact with the floor surface; an intermediate body disposed between the guard part and the base part and having second screw through-holes formed therethrough; and stud bolts passing through the guard part, the intermediate body, and the base part so as to fix the base part to the floor surface, wherein when an external force is applied, the elastic and flexible intermediate body is compressed in a collision direction to effectively reduce the impact.

Protector for installation on floor

An active rectifier and a wireless power reception apparatus using the same are disclosed herein. The active rectifier includes first and fourth switches, second and third switches, and a synchronization control unit. The first and fourth switches are turned on while the voltage of an alternating current (AC) input is negative, and apply the current of the AC input to a rectifying capacitor. The second and third switches are turned on while a voltage of the AC input is positive, and apply the current of the AC input to the rectifying capacitor. The synchronization control unit compensates for the delay time of the comparator for detecting zero-crossing of the AC input so as to switch the first to fourth switches.

Growing community of inventors

Seoul, South Korea

Jae Hyung Jang