LS Industrial Systems Co.

South Korea

LS Industrial Systems Co.

South Korea
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Patent
LS Industrial Systems Co. | Date: 2011-06-08

Provided herein is a mechanism for correcting the deformation generated at a portion of the rotation pin (2a, 2b) between a single pole unit (3d) farthest away from a switching mechanism (1) and a single pole unit (3c) adjacent thereto, and there is disclosed a correction plate (4) provided at a portion of the pair of rotation pins located between a single pole unit farthest away from the switching mechanism and a single pole unit adjacent thereto, having a pair of rotation pin through hole portions (4a, 4a) to allow the pair of rotation pins to be penetrated, respectively, and a pair of adjustment extending portions (4b, 4b) extended in the direction in which the rotation pins penetrate at the upper or lower portion of the rotation pin through hole portions to determine the height of penetration allowance hole of the rotation pins together with the rotation pin through hole portions.


Patent
LS Industrial Systems Co. | Date: 2011-08-31

A method for detecting offset signal corresponding to transmission leakage signal is disclosed, whereby reception sensitivity can be improved by accurately offsetting a leakage signal in transmission signal mixedly inputted into the reception signal in a radio transceiver, and an offset signal corresponding to a transmission leakage signal can be rapidly detected in the radio transceiver to rapidly offset the transmission leakage signal included in a reception signal.The method is characterized by: (a) setting a leakage signal of a transmission signal on a vector phase-plane relative to magnitude and phase; (b) dividing the vector phase-plane to a plurality of areas to determine a plurality of sample points for each divided area; (c) sequentially detecting a vector from any one sample point selected from the pJurality of sample points to another sample point based on each area; (d) calculating a gradient of a resultant vector relative to the detected vector; (e) checking if the resultant vector has converged into a current area; (f) repeating the (b) through (e) steps at least once, if there exists a descent gradient converging into the current area; (g) determining as an offset signal corresponding to the transmission leakage signal using a maximum descent gradient among the gradients detected in the (f) step.


Patent
LS Industrial Systems Co. | Date: 2011-07-13

An apparatus for controlling operation of inverter system configured to drive a motor by using an inverter, and to normally operate the motor in a resonance-generated frequency band if the resonance occurs, and a method thereof are disclosed, wherein the method includes detecting a current outputted by an inverter system to a motor, if an operation frequency of the motor is in a resonance frequency band, converting the detected current to a d axis current and a q axis current, calculating a difference between the converted d axis current and pre-sampled d axis current (magnetic flux portion), multiplying the calculated difference by a preset comparative control gain to calculate a comparative control voltage, and adding the calculated comparative control voltage to a torque portion voltage responsive to an operation frequency of the motor to generate a driving voltage of the motor.


Patent
LS Industrial Systems Co. | Date: 2011-07-06

A sealed cased magnetic switch comprises: a first contact pressure spring (23) having one end supported by the movable contactor and applying an elastic force to the movable contactor to provide a contact pressure in a direction in which the movable contactor is brought into contact with the fixed electrode; a spring seat member (25) supporting the other end of the first contact pressure spring and fixedly installed on the driving shaft; and a second contact pressure spring (24) having a diameter larger than that of the first contact pressure spring and applying an elastic force at an outer position in a radial direction compared with the first contact pressure spring to the movable contactor in a direction in which the movable contactor is brought into contact with the fixed electrode.


Patent
LS Industrial Systems Co. | Date: 2011-07-20

An RFID tag is disclosed, wherein the RFID tag includes a radiation pattern printing on an upper surface of a first dielectric substrate, a cross (+) type slot formed towards an upper part, a lower part, a left-side and a right-side on the basis of a center of the radiation pattern to divide a left-side radiation pattern and a right-side radiation pattern, a plurality of first connection patterns formed inside the upper part of the cross (+) type slot, connecting the left-side radiation pattern with the right-side radiation pattern, a tag chip settled inside the lower part of the cross (+) type slot, a feeding loop pattern electrically connecting the tag chip and the left-side radiation pattern, and the right-side radiation pattern, and a plurality of second connection patterns connecting the left-side radiation pattern and the right-side radiation pattern at an end part of the feeding loop pattern.


Patent
LS Industrial Systems Co. | Date: 2011-08-10

A device and a method for processing an input data of an protective relay, even in case that data stored in an accumulation buffer of the protective relay is damaged due to noises, etc., that can recover it and carry out a normal measurement are provided, the invention includes a digital signal processing part comprising inputting a sampled digital data to a digital signal processing part, counting and accumulating frequency of the inputted data, comparing the accumulated value with a value of a period, inputting a value of an update accumulation buffer to a measurement accumulation buffer and initializing the update accumulation buffer if the counted accumulation frequency is equal to the value of one period; and performing an RDFT(Recursive Discrete Fourier Transform) operation on the inputted digital data to dually buffering the measurement accumulation buffer and the update accumulation buffer,


Patent
LS Industrial Systems Co. | Date: 2011-04-27

Disclosed is a molded case circuit breaker having an instantaneous trip mechanism capable of instantaneously breaking a circuit upon occurrence of a fault current, the circuit breaker comprising: a main circuit unit (21, 22, 23) present in a lower compartment (20) of the molded case circuit breaker, and configured to open or close a circuit by having a stationary contactor (21) and a movable contactor (22) rotatable to contact with or separated from the stationary contactor; a switching mechanism (50) present in an upper compartment (10) of the molded case circuit breaker, and having an open position where the switching mechanism is connected to the main circuit unit to drive the main circuit unit to open a circuit, and a closing position where the switching mechanism drives the main circuit unit to close a circuit; an instantaneous trip mechanism (1, 2, 3) present in the upper compartment, and operating by an electromagnetic attraction in response to generation of a fault current on a circuit so as to trigger the switching mechanism to the open position; and an intermediate insulation barrier (60) installed between the upper compartment and the lower compartment for electrical insulation by partitioning the lower compartment having the main circuit unit and the upper compartment having the instantaneous trip mechanism and the switching mechanism.


Patent
LS Industrial Systems Co. | Date: 2012-11-28

A maximum power point tracking method is provided. The method includes temporarily determining a next voltage command using voltage and power measured at current and previous time points. When an increase or decrease in voltage command is continued predetermined times or more, it is decided that the next voltage command temporarily determined to be increased is decreased or that the next voltage command temporarily determined to be decreased is increased. The output voltage of a solar cell is regulated based on the decided next voltage command.


Patent
LS Industrial Systems Co. | Date: 2012-09-12

An vector modulator using a time delay and a phase shifter is disclosed, the vector modulator including a time delay (110) varying a phase of an input signal by time-delaying the input signal; a first coupler (120) converting the signal outputted in changed phase through the time delay to an I channel signal and a Q channel signal each having a 90 phase difference and outputting the I/Q channel signals; a first phase shifter (130) varying the phase of the I channel signal outputted from the first coupler within a predetermined phase range and outputting the phase-variable I channel signal; a second phase shifter (140) varying the Q channel signal outputted from the first coupler within a predetermined phase range and outputting the phase-variable Q channel signal; and a second coupler (150) coupling phase-variable I/Q channel signals and outputting the coupled signals.


Patent
LS Industrial Systems Co. | Date: 2012-11-28

A safety-extension base connected to a main base and a control method thereof are disclosed, the base includes a communication unit, a system state monitoring unit, a module control unit, a memory unit, a state conversion unit and a safety-processing unit. The communication unit performs data communication with the main base. The system state monitoring unit monitors a state of the PLC system using data communicated between the communication unit and the main base. The module control unit controls a general operation of the safety-extension base and outputs different cases of control signals according to whether or not the state of the PLC system is a normal state. The memory unit stores the data transmitted from the main base and a program and information, necessary for controlling the safety state of the safety-extension base. The state conversion unit converts the state of the safety-extension base into the normal state or safety state according to the control signal output from the module control unit. The safety-processing unit performs a control of the safety-extension base using the information transmitted from the main base, in a case the state of the safety-extension base is converted into the normal state by the state conversion unit, and performs a control of the safety-extension base according to a user-defined program previously stored in the memory unit, in a case the state of the safety-extension base is converted into the safety state by the state conversion unit.

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