Lg Electronics Inc.

Powertech Electronics

Kyung Hoon Jung

Byeong Wook Park

Dooyong Oh

Na Young Kang

Seungbok Ok

An induction heating device includes: a working coil, an inverter, a current transformer, a current detecting circuit, a voltage detecting circuit, an AND circuit, and a controller. The induction heating device may detect presence or absence of an object and a material of the object based on a magnitude of resonance current applied to the working coil and a phase difference between the resonance current and a voltage applied to a switching element of the inverter.

Induction heating device having improved detection accuracy with respect to material of object

An induction heating device includes a working coil, an inverter including a first switching element and a second switching element that are configured to perform a switching operation and to apply a resonance current to the working coil, a snubber capacitor including a first snubber capacitor connected to the first switching element, and a second snubber capacitor connected to the second switching element, a phase detector configured to detect a phase difference between the resonance current applied to the working coil and a switching voltage applied to the second switching element, and a controller configured to receive, from the phase detector, phase information including the phase difference, provide the inverter with a switching signal to thereby control the switching operation, and adjust an operating frequency of the switching signal based on the phase information to thereby control an output of the working coil.

Induction heating device having improved output control function

An induction heating device includes a first resonance circuit comprising a first working coil and a first resonance capacitor, a first inverter electrically connected to the first resonance circuit and configured to perform a first switching operation to thereby apply a first resonance current to the first working coil, a first group of snubber capacitors that are configured to be electrically connected to the first inverter, the first group of snubber capacitors comprising a first snubber capacitor and a second snubber capacitor, and a first relay configured to selectively connect the first group of snubber capacitors to the first inverter.

Induction heating device having improved interference noise removal function and power control function

Disclosed herein is a dome security camera. The camera includes a housing having a circuit part. A hemispherical cover is coupled to the housing. A camera module includes a casing which has a lens mounted on a central portion thereof and coupled to a barrel, a plurality of LEDs, and a sensor. A bracket is provided in the housing and coupled to the casing in such a way that it is rotated and open or closed. The casing has a hemispherical shape, and an annular coupling step is provided on a lower end of the casing. The bracket is a cylindrical member having an opening on an upper end thereof, and includes an enlarged part provided on the upper end of the opening and coupled to the casing, and a cut groove formed by cutting a side surface of the bracket, with a knob inserted into the cut groove.

Dome security camera

A dome type security camera structure with a reinforced waterproofing function is disclosed. The camera structure includes a housing () having an outside wire insert hole (), and a pair of opposite guide grooves (). Each guide groove communicates with an outside via a discharge hole (). A mounting bracket () has a coupling protrusion () guided by each guide groove, and is gradually inclined outwards from a center thereof so that an edge thereof presses a lower surface of the housing and thus the mounting bracket is coupled to the housing. A holder () is provided on a lower surface of the mounting bracket in such a way as to perform rotation on 2 or 3 axes, with a camera module mounted to the holder. A dome screen () is mounted to the mounting bracket, and surrounds the holder.

Growing community of inventors

Seoul, South Korea

Kyung Hoon Jung