Center for Integrated Smart Sensors Foundation

Withtech Inc

Hyun Wook Lee

Young Ki Kim

Kyung Hak Lee

Chong Min Kyung

Seoung-Kyo Yoo

Eung Sun Lee

Jae Hyun Choi

Disclosed is a transmitter used for a wireless charging system. The transmitter includes a plurality of phase locked loops (PLLs) that outputs single-phase power signals, a plurality of antennas that transmits power signals transmitted from the plurality of PLLs to a receiver, and a controller that determines a specific frequency for the receiver based on a signal strength indication (RSSI) received from the receiver and allows output frequencies of the plurality of PLLs to be different from each other in a specific frequency band preset based on the specific frequency.

Wireless charging system for using frequency control

Disclosed is a wireless charging system of using multi-frequency including at least one transmitter and at least one receiver which is wirelessly charged by the at least one transmitter, wherein the at least one transmitter includes a signal generator configured to generate a power signal of each of a plurality of frequency bands; a plurality of matching units connected to the signal generator matching and outputting the power signal of each of the plurality of frequency bands; and at least one antenna connected to the plurality of matching units transmitting the power signal of each of the plurality of frequency bands to each of at least one receiver, and wherein the at least one receiver includes at least one antenna receiving a power signal of each of a plurality of frequency bands from each of at least one transmitter; a plurality of matching units connected to the at least one antenna matching and outputting the power signal of each of the plurality of frequency bands; and a plurality of rectifiers connected to the plurality of matching units rectifying AC power applied to the power signal of each of the plurality of frequency bands to DC power.

Wireless charging system of using multi-frequency for wireless charging at long and short distance

Provided are a multi sampling port monitoring apparatus for measuring a pollution level in a predetermined space and a monitoring method using the same. More particularly, provided are a multi sampling port monitoring apparatus capable of effectively monitoring a pollution level in a wide space by including a plurality of sampling ports so that air is sucked at several points in a space to be measured, measuring an average pollution level of the air sucked from the plurality of sampling ports, and allowing pollution levels of the air sucked from the sampling ports to be individually measured in the case in which the average pollution level is out of a predetermined range, and a monitoring method using the same.

Multi sampling port monitoring apparatus for measuring pollution level and monitoring method using the same

Growing community of inventors

Daejeon, South Korea

Hyun Wook Lee