摘要:
In accordance with the present invention, a power converter transformer for suppressing conduction EMI(ElectroMagnetic Interference) includes a primary winding positioned at a primary side; a secondary winding positioned at a second side and coupled with the primary winding; a parasitic capacitor connected between one end of the primary winding and one end of the secondary winding; a switching unit connected to the other end of the primary winding; a Y-capacitor connected between the switching unit and a ground terminal; an auxiliary winding positioned at the secondary side and coupled with the secondary winding; and an auxiliary capacitor connected between the one end of the primary winding and the auxiliary winding.
摘要:
There are disclosed a photovoltaic and fuel cell (PV-FC) hybrid generation system using a single converter and a single inverter, and a method of controlling the same. The PV-FC hybrid generation system includes a DC/DC converter unit converting an FC output voltage from a fuel cell, converting chemical energy into electrical energy, into a preset voltage, a DC link unit commonly connecting an output terminal of a photovoltaic cell, converting the sunlight into electrical energy, and an output terminal of the DC/DC converter unit, and linking the converted FC output voltage from the DC/DC converter unit with a PV output voltage from the photovoltaic cell to thereby generate a DC voltage, and a DC/AC inverter unit converting the DC voltage from the DC link unit into a preset AC voltage. Furthermore, a method of controlling the PV-FC hybrid generation system is proposed.
摘要:
A straight traveling hydraulic circuit is provided. In case of performing a combined operation in which a fine operation of a working device and a fine traveling of a traveling device are simultaneously required, the straight traveling hydraulic circuit can allow the working device and the traveling device to operate independently, and thus prevent a declination or sudden traveling of the equipment. In case of performing the combined operation by simultaneously operating the traveling device and the working device, first and second center bypass shifting valves installed on the lowermost stream side of first and second center bypass passages are shifted by a pilot signal pressure that shifts a straight traveling valve installed on an upper stream side of the second center bypass passage, so that the degree of opening of the first and second center bypass passages is reduced to operate the working device and the traveling device independently.
摘要:
The present invention relates to a display driving circuit, which includes a latch-up prevention unit, thus preventing the occurrence of latch-up. The display driving circuit according to the present invention includes first to third voltage generation units configured to receive an externally applied input voltage having a same magnitude and generate respective voltages having different magnitudes, and a latch-up prevention unit connected to the second voltage generation unit and configured to receive a lower voltage among voltages output from the second voltage generation unit and to ground the lower voltage for a preset period of time. Accordingly, the second driving voltage output from the second voltage generation unit is connected to the latch-up prevention unit, including a plurality of switching means connected to the ground, and is grounded for a preset period of time, thus preventing the occurrence of latch-up and reducing the size of the driving circuit.
摘要:
The present invention relates to a combined pharmaceutical formulation, which is such designed that the release of each ingredient may be controlled to a predetermined release rate by applying the principle of the so-called chronotherapy, where drugs are administered in such a way that the activities of the drugs are expressed at intervals. The formulation of the present invention comprises statin-based lipid-lowering agent and dihydropyridine-based calcium channel blocker that affects cytochrome P450 enzyme as active ingredients, and is such constituted that the release rates of the aforementioned ingredients are different, thus preventing antagonism and side effects, while maintaining the synergistic effect, which leads to the convenience in medication.
摘要:
A pressure control valve is disclosed, which can suppress the generation of noise and vibration due to cavitation when hydraulic fluid is fed from a high-pressure side to a low-pressure side, which is caused by the change of a pilot poppet structure that is in detachable contact with a seat of the pressure control valve to close/open a flow path. The pressure control valve includes a pilot poppet, being detachably in contact with a two-stage seat formed in a flow path connecting a high-pressure path with a low-pressure path, for closing/opening the flow path, an elastic member for elastically biasing the pilot poppet, which has been pressed onto the seat to close the flow path, to its initial state, and a ring-shaped balancing groove formed on a periphery of the pilot poppet that forms a ring-shaped gap in association with the seat when the pilot poppet is lifted from the seat.
摘要:
Disclosed is a hydraulic control circuit and method thereof for reducing heat generation and energy losses caused by overload. The hydraulic control circuit of the present invention includes a control lever for generating a manipulated signal according to a manipulated variable; a control valve driven by a pilot signal pressure for controlling a flow of the pressurized fluid traveling from the hydraulic pump to the actuator; a displacement sensor for detecting a switching position of the control valve; a pump pressure sensor for detecting a pump pressure applied to the hydraulic pump; an electronic proportional valve for supplying a pilot signal pressure to the control valve; and a controller for receiving the manipulated signal, determining a pilot signal pressure, outputting a control signal to the electronic proportional valve, receiving signals from the displacement sensor and the pump pressure sensor and comparing the signals with pre-stored reference data, and outputting to the electronic proportional valve a stroke error correcting control signal for adjusting the switching position of the control valve.
摘要:
The present invention relates to a variable flow control apparatus for an actuator of a heavy construction equipment capable of implementing constant flow of hydraulic fluid from a hydraulic pump to an actuator even when a pilot pressure capable of driving a seat valve openably and closably installed in a discharge flow path of the hydraulic pump exceeds a certain pressure level.
摘要:
The present invention relates to a control apparatus of a hydraulic valve for holding load in which a drain line of a holding valve adapted to preclude momentary drop of load in a hydraulic actuator is substituted with a path in the interior of a directional control valve, so that a pipe line of a drain side functioning as a hydraulic hose and exposed to the outside is not needed in the present invention. The control apparatus of a hydraulic valve for holding load comprises a drain line adapted to allow hydraulic fluid returned during a switching operation of the sub-spool to flow in a pilot line of the side of a drain corresponding to the opposite side of a pilot line adapted to pressurize the spool of the directional control valve.
摘要:
The present invention relates to a hydraulic circuit for a boom cylinder combination having a float function which is capable of implementing a leveling work in such a manner that a leveling work is performed by lowering a boom based on its self-weight without using an operation oil discharged from a hydraulic pump using an excavator during a leveling work which includes a first inner path which is formed in one side of the boom cylinder combining spool and connects a hydraulic pump and a boom cylinder large chamber in a switching mode, a second inner path which is formed in the other side of the boom cylinder combining spool and connects an operation oil from the hydraulic pump to a hydraulic tank in a switching mode, and a third inner path which is formed in the other side of the boom cylinder combining spool and combines the operation oils from the small chamber and large chamber of the boom cylinder in a switching mode and connects the same to the hydraulic tank.