Abstract: A method, an apparatus, and a computer program product for performance management are provided. The apparatus may be an electronic device. The electronic device detects a change of form factor mode or ambient wind using a detection circuit or at least one sensor. The change of form factor mode may include at least one of folding the electronic device, unfolding the electronic device, rolling the electronic device, changing a flexible shape of the electronic device, or equipping a cover on the electronic device. A set of thermal control parameters may be determined based on the detected change. The set of thermal control parameters may be retrieved from a lookup table or calculated using a mathematical model. The electronic device adjusts the performance based on the set of thermal control parameters.

Abstract: An integrated state vector management system for control systems includes a plurality of co-processors configured to generate and utilize state vector data. The integrated state vector management system further includes state vector module communicatively connected to each of the plurality of co-processors. The state vector module includes a state vector memory containing at least three memory buffers for storing three datasets of state vector data. The state vector module further includes a state vector memory control logic communicatively coupled to the state vector memory. The state vector control logic is configured to provide read and write control to the state vector memory. The state vector memory control logic includes at least a write pointer controller and a read pointer controller.

Abstract: A simulation system that includes interconnected simulation blocks which use process models to perform simulation activities for a process plant is integrated into a process control environment for the process plant in a manner that makes the simulation system easy to use and easily updated for on-line process simulation. The disclosed simulation system enables future predicted values as well as the current predicted values of process parameters produced by the simulation system to be made available for performance evaluation as well as to guide plant operations. Additionally, the simulation system is connected to the operating process plant to receive various on-line process plant measurements, and uses these measurements to automatically update the process models used in the simulation system, to thereby keep the simulation system coordinated with the actual operating conditions of the process plant.

Abstract: A positioning device and a programmable logic controller (PLC) system including the positioning device are provided. The positioning device includes a computing unit that analyzes a positioning start instruction that includes an operation pattern, a storage unit that stores therein an operation pattern and an analysis result obtained by the computing unit analyzing the operation pattern stored in the storage unit in association with each other, and an instruction generating unit including a processor that, when it is verified that the operation pattern stored in the storage unit corresponds to the operation pattern included in the positioning start instruction, reads the analysis result associated with the operation pattern stored in the storage unit and generates positioning instruction data for positioning a control target by using the read analysis result.

Abstract: The invention relates to a method of controlling a gear cutting machine having at least one tool for cutting gears into a workpiece clamped in a workpiece mount, wherein the machine control carries out a three-dimensional collision monitoring during the gear cutting machining.

Abstract: Alignment features (60) associated with a support fixture (36) provide side scan data and top scan data reference points. Side scan displacement sensors (112) obtain side scan data of workpiece edge segments (23), and one or more cameras (130) obtain top scan data to provide a machining reference for the side scan data. The side scan data can be transformed into a top-view coordinate system usable by the laser machining system (140).

Abstract: A method for controlling a machine tool in which a main spindle on which a tool is mounted and a table holding a workpiece are moved relative to each other by two or more translation axes that are not perpendicular to each other and at least one rotation axis. In the method, an error in a position of the tool with respect to the workpiece due to a geometric error is corrected to calculate a command value for controlling the translation axis. The method includes a conversion step of converting the error and a correction value for correcting the error by performing a homogeneous coordinate transformation from a workpiece coordinate system to the imaginary Cartesian coordinate system, and a correction value calculation step of calculating a correction value in a command value coordinate system of the translation axis by performing a homogeneous coordinate transformation of the correction value.

Abstract: A thermal displacement correcting apparatus includes a correction amount estimating device and a parameter automatic selecting device that, in a machine tool having two different sets of specifications that differ due to the presence/absence of a scale and different methods of measuring the lengths of a bed and a table, estimate a thermal displacement correction amount of the machine tool of each set of specifications. The two devices store a collection of parameters for an estimated thermal displacement calculation corresponding to each of the bed, the scale, the table, and a workpiece, as a database, and select the parameters belonging to the set of specifications from the database based on machine information according to each set of specifications, calculate estimated thermal displacements of the bed, the table, and the workpiece, or also the scale, according to the selected parameters, and combine the estimated thermal displacements.

Abstract: Technologies for bio-chemically controlling operation of a machine include applying a bio-chemical agent to an operator of the machine and controlling an operational characteristic of the machine based on the presence of the bio-chemical agent on the operator. The operational characteristic of the machine may be controlled based on the presence or lack of the biochemical agent on the operator. In some embodiments, the bio-chemical agent may be configured to generate a bio-chemical trigger in response to exposure to a biochemical or biological characteristic of the operator. The operation of the machine may be controlled based on such bio-chemical trigger or reaction.

Abstract: Systems and methods of inspecting a manufactured part include creating a computer model of the part with a desired model contour having a model feature at a desired location. The manufactured part is scanned to obtain scanned data indicative of a manufactured surface formed in a manufactured contour and having a manufactured feature at an actual location on the manufactured surface. The computer model is modified using modeled reaction forces so that the model contour matches the manufactured surface. A determination whether the manufactured part is acceptable is based on a comparison of the actual location of the manufactured feature with and the desired location of the model feature with the model surface in the modified model contour. Additionally or alternatively, the reaction forces are compared with a reaction force threshold to determine whether the manufactured part requires reworking.

Abstract: A numerical controller estimates a machining continuable time before a currently controlled motor overheats if an output of the motor exceeds a continuous rated output and predicts respective execution times of command blocks and the machining continuable time for each command block, for a currently running block and its subsequent command blocks. Based on these predicted data, the numerical controller identifies a command block (alarm generation block) in which the motor overheats and a command block (stop block) in which driving control can be safely stopped, within the range of command blocks from the currently running command block to the alarm generation block.

Abstract: In a numerical controller that controls a plurality of machine control axes based on a machining program, priorities are assigned to operations of the plurality of machine control axes, and the numerical controller includes: a command analyzing portion that analyzes the machining program and generates command data which controls the plurality of machine control axes; and a block execution start determining portion that determines whether interference occurs in the operations of the plurality of machine control axes based on the command data and, if a determination is made that interference occurs, adjusts timing with which a command which controls an operation of a machine control axis of lower priority of the plurality of machine control axes that interfere with each other is started to a time at which the interference does not occur and positioning is completed in the shortest time.

Abstract: The invention is directed to a system and method for representing how a photograph was captured in relation to the field capture, and mapping this onto a shape in a 3D dimensional print. More specifically, a group of images, or single image captured through a lens with field of view distortion, is captured and stored together as a group. The images may be stitched together to form a single image. Once stitched together, a three-dimensional file is created and stored to the system. A server then provides the three-dimensional file to a three-dimensional printer for printing. Once printed, the three-dimensional object is packaged and mailed to the sender.

Abstract: A multiple system numerical control device for executing multiple system control for dividing plural axes to be controlled to plural systems and controlling each system based on different machining program in parallel, wherein, the plural systems includes a normal interpolation period system configured to operate at normal interpolation period and control a first control axis, and a high speed interpolation period system configured to operate at high speed interpolation period shorter than the normal interpolation period and control a second control axis, and processing in the normal interpolation period system executed in a first interpolation processing unit, a first coordinate update processing unit, and a data management information generation unit are executed plural times in a normal interpolation period according to system ratio of the normal interpolation period and the high speed interpolation period.

Abstract: A remote control station that accesses one of at least two different robots that each have at least one unique robot feature. The remote control station receives information that identifies the robot feature of the accessed robot. The remote station displays a display user interface that includes at least one field that corresponds to the robot feature of the accessed robot. The robot may have a laser pointer and/or a projector.

Abstract: A method and system (10) are provided for automatically portioning workpieces (14) using a rotating blade (22) passing through narrow gap (20) formed between the ends of adjacent conveyors (12) and (18). A scanning system (16) scans the workpieces (14) to physically characterize the workpieces and control the operation of the blade (22), including its rotational speed. The portioning of the workpiece can be carried out in accordance with one or more directly-controlled characteristics (parameter/specifications), such as a cutting path of the blade (22), the rotational speed of the blade (22), and the speed of the conveyor (12). The directly-controlled characteristics may be varied until an acceptable set of one or more indirectly-controlled characteristics is achieved, including, for example, the weight of the cut portions, the quality of the cuts achieved by the cutting blade, and the throughput of the portioning system (10).

Abstract: To decode a file name set to a PLC to the same name even if a plurality of external devices using different character-code sets are connected to the PLC, the PLC includes a system unit that actuates the control file using a multilingual character-code set A, a character-code conversion table that associates character codes relating to a plurality of character-code sets with one another for every character, and a character-code management unit that converts description of the name of the control file between the description relating to the multilingual character-code set A and that relating to the local character-code set A using the character-code conversion table when the name of the access-target control file is transferred between the external device using the local character-code set A and the system unit.

Abstract: A system is provided for controlling a line speed of a conveyor belt of a conveyor system during product changeovers in a wallboard production line. A central control module controls operation of a position sensor and a database. The position sensor is located on top of a conveyor table for providing positional information of a slurry head formed in front of a forming plate of the conveyor system. A position detection module receives a position signal from the position sensor, and determines whether the slurry head is located within a predetermined distance relative to the position sensor based on the position signal. A speed adjustment module regulates the line speed of the conveyor belt based on the position signal.

Abstract: Systems and methods to graphically display process control system information are disclosed. Some example methods include monitoring process variables in a process control system, determining a current state of a first one of the process variables, and determining a trend associated with the first process variable. Some such examples further include generating a first graphic representative of information associated with the first process variable, the information comprising the current state of the first process variable and the trend of the first process variable. Some example methods also include rendering the first graphic via a display.

Abstract: In accordance with one embodiment, a method for monitoring the health of blades in a combustion turbine engine is provided. Sensors mounted around the circumference of a rotor sense and record the passage of blades during turbine operation. Analysis of information from the sensors indicates whether a blade is damaged. Analysis of blade vibration and amplitude, as measured by the sensors, is used to predict the number of cycles the blade can undergo before replacement or maintenance.

Abstract: A method for monitoring degradation of an onboard device of an aircraft, implemented by a computer, the degree of degradation of the onboard device being defined by an abnormality score formed by the counting of occurrences of abnormalities noted by a control system of the device, the monitoring method comprising a step of comparing an abnormality score obtained for an observation sequence of given length (n, t) with a decision threshold (ks) and a step of issuing an alarm in the event of the decision threshold (ks) being reached or exceeded, the decision threshold (ks) being determined automatically for a given probability of alarm Pa, corresponding to the probability that an alarm will be issued during the monitoring method whereas the onboard device is sound, by means of the following steps: a step of obtaining an abnormality score (r) on at least one reference sequence corresponding to flights of the aircraft without degradation and with a length (m, tc) equal to a plurality of lengths (n, t) of observ

Abstract: A remote operator station may include a seat. A first and a second input device may be disposed on the seat. An interface device may be discretely arranged with respect to the remote operator station and may include an interface processor in communication with a machine. The interface processor may be configured to remotely control non-movement features and function of the machine. An electronic control module may be in communication with, at least, the first and second input devices. The electronic control module may be configured to: receive input signals from one of the first and second input devices; process the input signals; and communicate wirelessly processed input signals to a machine for remote operation thereof.

Abstract: The invention relates to a rotary-wing drone (10) comprising a drone body comprising an electronic board controlling the piloting of the drone, a wireless communication module and a plurality of connection arms, the wireless communication module being connected to a communication antenna (46), a plurality of propulsion units (36) mounted at the end of respective connection arms (34), and at least one drone body support (38) adapted to maintain the drone body remote from the ground. The drone body support (38) comprises an antenna housing (44) for holding the communication antenna.

Abstract: A plurality of air data may be collected by a sensor within a data center. The plurality of air data is received by a processor. At least a portion of the received plurality of air data corresponding to at least one zone within the data center may be determined to satisfy a threshold. Coordinates of a geographical location associated with the zone that includes the sensor may be transmitted to a robotic filter. The robotic filter can be dispatched to the transmitted geographic location to filter the zone.

Abstract: A method and system comprises a plurality of electronically controlled distributed devices and a supervisory node. The supervisory node comprises a communications interface, a processor, and a display. The supervisory node is configured to communicate with the plurality of electronically controlled distributed devices via the communications interface.

Abstract: Aspects of the present disclosure relate to a vehicle for maneuvering a passenger to a destination autonomously. The vehicle includes one or more computing devices and a set of user input buttons for communicating requests to stop the vehicle and to initiate a trip to the destination with the one or more computing devices. The set of user input buttons consisting essentially of a dual-purpose button and an emergency stopping button different from the dual-purpose button configured to stop the vehicle. The dual-purpose button has a first purpose for communicating a request to initiate the trip to the destination and a second purpose for communicating a request to pull the vehicle over and stop the vehicle. The vehicle has no steering wheel and no user inputs for the steering, acceleration, and deceleration of the vehicle other than the set of user input buttons.

Abstract: The present invention relates generally to techniques for improving fuel efficiency of a vehicle powered by an internal combustion engine capable of operating at various displacement levels. An autonomous driving unit or cruise controller selects when possible an engine torque output that corresponds to a fuel efficient displacement level. The resultant vehicle speed profile and NVH level is acceptable to vehicle occupants.

Abstract: A method of developing a flight path for precision flying over an area of interest, the method including, in an electronic processing device, determining coordinate and elevation data relating to an area of interest, using the coordinate and elevation data to determine a flight path including precision paths corresponding to precision flying trajectories and non-precision paths interconnecting at least some of the precision paths, and generating path data at least partially indicative of the flight path, the path data being useable in generating control signals for at least partially controlling operation of the aircraft, in use.

Abstract: The disclosure provides a method and apparatus for determination of a control policy for a rigid body system, where the rigid body system comprises a sensor and a plurality of actuators designed to maneuver the rigid body system and orient the sensor toward a plurality of defined vertices, such as geographic points on the earth surface. A processor receives input data describing an initial state of the rigid body system and further receives a plurality of candidate vertices for potential targeting by the sensor. The processor additionally receives an intrinsic value for each vertex, reflecting the relative desirability of respective vertices in the plurality of vertices. The processor determines an appropriate control policy based on the vertices, the intrinsic values, and the rigid body system through a formulation of the determination process as an optimization problem which actively considers various constraints during the optimization, such as maneuvering and observation constraints.

Abstract: Disclosed in the present invention is an autonomous vehicle (1), which comprises an housing (21), an driving module mounted on the housing (21), an borderline detecting module mounted on the housing for detecting the distance between the autonomous vehicle (1) and the borderline (3), an energy module mounted on the housing for providing energy for the autonomous vehicle, and an control module electrically connected with the driving module and the borderline detecting module.

Abstract: An apparatus controller for prompting a rider to be positioned on a vehicle in such a manner as to reduce lateral instability due to lateral acceleration of the vehicle. The apparatus has an input for receiving specification from the rider of a desired direction of travel, and indicating means for reflecting to the rider a propitious instantaneous body orientation to enhance stability in the face of lateral acceleration. The indicating may include a handlebar that is pivotable with respect to the vehicle and that is driven in response to vehicle turning.

Abstract: A system is described for presenting information relating to lifting and moving a load object with a vehicle. Upon the lifting, a dimensioner determines a size and a shape of the load object, computes a corresponding spatial representation, and generates a corresponding video signal. During the moving, an imager observes a scene in front of the vehicle, relative to its forward motion direction, and generates a video signal corresponding to the observed scene. The imager has at least one element moveable vertically, relative to the lifting. A display renders a real time visual representation of the scene observed in front of the vehicle based on the corresponding video signal and superimposes a representation of the computed spatial representation of the load object.

Abstract: In one embodiment, a control system for a base station includes a first transceiver configured to receive a first signal and send a second signal to an agricultural vehicle. The first signal indicates at least an acceleration of the vehicle, a current velocity of the vehicle, and a location relative to a terrain where the vehicle experienced the acceleration, and the second signal indicates a vehicle target velocity. The control system includes a controller configured to determine a bump severity value based on the acceleration and the current velocity of the vehicle, mark an area indicative of the bump on a map of the terrain when the bump severity value exceeds a threshold, and automatically generate the second signal when the vehicle enters the area. The target velocity is based on a proximity of the vehicle to the bump, the bump severity value, or some combination thereof.

Abstract: A system and method include scanning a light detection and ranging (LIDAR) device through a range of orientations corresponding to a scanning zone while emitting light pulses from the LIDAR device. The method also includes receiving returning light pulses corresponding to the light pulses emitted from the LIDAR device and determining initial point cloud data based on time delays between emitting the light pulses and receiving the corresponding returning light pulses and the orientations of the LIDAR device. The initial point cloud data has an initial angular resolution. The method includes identifying, based on the initial point cloud data, a reflective feature in the scanning zone and determining an enhancement region and an enhanced angular resolution for a subsequent scan to provide a higher spatial resolution in at least a portion of subsequent point cloud data from the subsequent scan corresponding to the reflective feature.

Abstract: Systems, methods, and devices for predicting a driver's intention and future movements of a proximal vehicle, whether an automated vehicle or a human driven vehicle, are disclosed herein. A system for predicting future movements of a vehicle includes an intersection component, a camera system, a boundary component, and a prediction component. The intersection component is configured to determine that a parent vehicle is near an intersection. The camera system is configured to capture an image of the proximal vehicle. The boundary component is configured to identify a sub-portion of the image containing a turn signal indicator on the proximal vehicle. The prediction component is configured to predict future movement of the proximal vehicle through the intersection based on a state of the turn signal indicator.

Abstract: A moving robot configured to generate a map of an environment of a territory and allow a user to set a structure of the territory and information on the map used for a location-based service and to use a more intuitively intelligent service is provided. The moving robot includes an operation performer configured to move around a territory and perform a certain operation, a detector configured to collect map building information of the territory, and a controller configured to control the moving robot to move to a set particular area within the territory by referring to the map information of the territory generated based on the collected map building information and control the operation performer to perform the operation with respect to the particular area.

Abstract: In a system and method for communicating data between first and second vehicles, a first electronic component in the first vehicle is monitored to determine if the component is in (or enters) a failure state. In the failure state, the first electronic component is unable to perform a designated function. Upon determining the failure state, data is transmitted from the first vehicle to a second electronic component on the second vehicle, over a communication channel linking the first vehicle and the second vehicle. The second electronic component is operated based on the transmitted data, with the second electronic component performing the designated function that the first electronic component is unable to perform.

Abstract: A pressure independent control valve for controlling liquid flow includes a tubular body having an inlet duct and an outlet duct coaxial with each other, a central body arranged therebetween with an axis inclined with respect to the inlet and outlet ducts and including an upstream chamber and a downstream chamber coaxial with each other and communicating through an adjustment orifice, the upstream chamber and downstream chamber suitable for housing a first functional group defined by a control device for controlling the differential pressure between upstream of the orifice in correspondence of the upstream chamber and downstream of the orifice in correspondence with the outlet duct, and a second functional group coaxial to the first functional group and defined by an adjustment device suitable for increasing or decreasing the passage of fluid through the orifice, the device including axial actuation elements both rotationally operable and in axial translation.

Abstract: A method and apparatus for self-calibrating control of gas flow. The gas flow rate is initially set by controlling, to a high degree of precision, the amount of opening of a flow restriction, where the design of the apparatus containing the flow restriction lends itself to achieving high precision. The gas flow rate is then measured by a pressure rate-of-drop upstream of the flow restriction, and the amount of flow restriction opening is adjusted, if need be, to obtain exactly the desired flow.

Abstract: A gaseous-fluid environmental sensor having a gaseous-fluid flow system. The gaseous-fluid flow system includes a blower to move the gaseous fluid from a inlet intake port to an outlet exhaust port via a flow path. The blower includes a motor, which can have a fluid dynamic bearing. The gaseous-fluid environmental sensor further includes a flow sensor to sense a parameter relating to a flow of the gaseous fluid through the flow path and provide a signal based on the parameter, and a controller coupled to the flow sensor. The controller controls the blower based on the signal.

Abstract: Method and device for metering a medium from at least one storage tank by a metering device, which has a piston pump, which defines a working chamber with a cylinder and a piston, wherein in a first method step a determined filling quantity of a medium is conveyed via an inlet valve into the working chamber and the determined filling quantity is greater than the quantity to be metered and, in a second method step, the piston reduces the working chamber in size enough that only the quantity to be metered remains, wherein the excess medium flows out of the working chamber, wherein the excess medium flows via the inlet valve back into a ring line, which is connected in a medium-conducting manner to the storage tank and is arranged outside the working chamber.

Abstract: A fully-integrated flow-control valve assembly for top-filled fuel tanks incorporates both a float valve assembly and a shut-off valve assembly in a single unit that screws into a threaded aperture in the top of the fuel tank. Whereas all other systems having similar function rely on an inlet valve and a level control/vent positioned apart from one another and intercoupled with a bleed line that runs either inside or outside the fuel tank, the device of the present invention directly mounts the two devices together and allows a simple installation. There is no need for a line that couples two remotely positioned units of the prior art flow-control assemblies.

Abstract: A pressure reducing valve includes a partition member. The partition member separates a valve chamber and a pressure regulating chamber from each other and has a communication hole for ensuring communication between the valve chamber and the pressure regulating chamber. A valve body has a body portion, which is located in the valve chamber, and a rod section, which extends from the body portion. The rod section extends to the pressure regulating chamber through the communication hole. A communication line is arranged between a peripheral wall of the communication hole and the rod section. The partition member has an annular groove in the peripheral wall of the communication hole. The groove extends along the full circumference of the communication hole.

Abstract: Disclosed are a method of correcting a control logic of a selective catalytic reduction (SCR) catalyst and an exhaust system. The control logic may be adapted to calculate an injection amount of a reducing agent for the SCR catalyst at the least. The method may include detecting input variables including temperature of the SCR catalyst and exhaust flow rate, discretizing the input variables, standardizing the discretized input variables, determining whether the discretized input variables are within a correction range, and correcting the control logic of the SCR catalyst if the discretized input variables are within the correction range.

Abstract: A rack management method and system is disclosed. The method includes detecting the presence of a computing device releasably mounted in a frame, the detecting based on an electrical connection established between a configuration bar disposed in a rear portion of the frame and the computing device, and determining a physical location of the computing device within the frame based on the electrical connection. The method also includes retrieving management information about the computing device from a profile storage disposed within the computing device via the electrical connection and storing the management information in a management table, the management table associating the computing device with the physical location within the frame.

Abstract: Presented systems and methods can facilitate efficient voltage sensing and regulation. In one embodiment, a presented multiple point voltage sensing system includes Multiple point voltage sensing. Multi-point sensing is the scheme where voltage feedback from Silicon to the voltage regulator is an average from multiple points on the die. In one embodiment, multi-point sensing is done by placing multiple sense points across the partition/silicon and merging the sense traces from each sense point with balanced routing. In one embodiment, a presented multiple point voltage sensing system includes Virtual VDD Sensing with guaranteed non-floating feedback. In one exemplary implementation, Virtual VDD Sensing with guaranteed non-floating feedback allows more accurate sensing when a component is power gated off by removing the sensing results associated with the component.

Abstract: In a boost converter operation, a first voltage that is independent of an input voltage of the boost converter is preset in the boost converter, having an increased voltage level compared to the input voltage, as the setpoint output voltage, as long as the input voltage is below a first voltage threshold value, which is lower than the first voltage. As soon as the input voltage exceeds the first voltage threshold value, a second voltage that is a function of the input voltage is preset, having a lower voltage level compared to the input voltage, as the setpoint output voltage. As soon as the input voltage drops below a second voltage threshold value, which is lower than the first voltage, the first voltage is again preset as the setpoint output voltage.

Abstract: A low drop-out (LDO) regulator includes a pass transistor, a feedback circuit, an error amplifier, and a compensation unit. The pass transistor is configured to regulate a power supply and output an output voltage according to a control signal. The feedback circuit is configured to generate a feedback voltage based on the output voltage. The error amplifier is configured to output a comparison signal in response to a reference voltage and the feedback voltage. The compensation circuit is configured to generate a negative capacitance in association with a first node connected to a gate electrode of the pass transistor.

Abstract: A voltage regulator may include an error amplifier configured to amplify a difference between a reference voltage and a feedback voltage and generate a first amplified voltage based thereon; a power transistor between a second voltage supply node and an output node of the voltage regulator, the power transistor including a gate configured to receive a gate voltage; a buffer between a first voltage supply node and a ground, the buffer configured to generate the gate voltage based on the first amplified voltage; a voltage divider between the output node and the ground, the voltage divider configured to generate the feedback voltage based on the output voltage; and a control circuit configured to connect the output node to the ground through the gate of the power transistor based on the output voltage and the gate voltage.

Abstract: A regulation circuit of a power converter for cable compensation according to the present invention comprises a signal generator generating a compensation signal in accordance with a synchronous rectifying signal. An error amplifier has a reference signal for generating a feedback signal in accordance with an output voltage of the power converter. The compensation signal is coupled to program the reference signal. The feedback signal is coupled to generate a switching signal for regulating an output of the power converter. The regulation circuit of the present invention compensates the output voltage without a shunt resistor to sense the output current of the power converter for reducing power loss.