Abstract: A controller of a switching power supply can include: a frequency-jittering control circuit configured to generate a frequency-jittering signal adaptively; a comparator having two input terminals for respectively receiving an inductor current sampling signal and a feedback control signal, and being configured to compare the signals of the two input terminals to generate a switching control signal, in order to control a power transistor in the switching power supply; and a superimposing circuit configured to superimpose the frequency-jittering signal on one of the two input terminals of the comparator, where a switching frequency of the switching power supply varies within a preset range under different load conditions.

Abstract: A double-mirror focusing inside-beam powder-feeding laser-cladding device includes: first and second reflection beam splitters, a focusing lens, a vertical piping powder feeding device, and a collimated lens group. The first reflection beam splitter is disposed at a side of the collimated lens group; the second reflection beam splitter is disposed outside the first reflection beam splitter; the focusing lens is disposed at a side of the second reflection beam splitter facing away the collimated lens group; and the vertical piping powder feeding device is disposed at a side of the first reflection beam splitter facing away the collimated lens group. When the device is in use, a collimated beam is formed through the collimated lens group, and then reflected by the first and second reflection beam splitters to form an annular laser beam that can be focused by the focusing lens to form a light spot.

Abstract: Since defect areas in collected hydro turbine defect images account for a small proportion and there is a significant color difference between surrounding background and defects, which creates too much redundant information and greatly affects detection speed, a method for detecting defects in a hydro turbine top cover based on an improved YOLOv8 model involves first cropping collected defect images to obtain cropped images, then expanding the cropped images by image enhancement techniques such as image flipping and image blurring to obtain a training dataset. A defect detection network based on YOLOv8-CBAM is constructed and trained to generate a defect detection model for detecting the defects in the hydro turbine top cover. The method achieves high precision in defect detection for the hydro turbine top cover.

Abstract: An in-situ robot material-reducing processing method and system for a hydraulic turbine top cover are provided. The method includes: S1, obtaining frequency response data of an end of a cutter controlled by a robot by performing an impact hammer test; S2, obtaining a modal parameter of the end of the cutter controlled by the robot by using a modal analysis software; S3, obtaining a damping matrix [C] and a stiffness matrix [K] by using a free vibration equation of a damped system; S4, establishing a dynamic model of a three-degree-of-freedom robot processing system; S5, obtaining a milling force coefficient of the cutter by performing a calibration experiment; S6, solving a dynamic equation; S7, drawing a lobe diagram of flutter stability of a milling process performed by the robot; and S8, obtaining stable milling process parameters according to the lobe diagram of flutter stability.

Abstract: A device for repairing a top cover of a hydro turbine by adding or removing materials includes a rotating support base, a connecting arm, a movable frame, and a machining assembly. The rotating support base includes a base and a rotating seat disposed on the base, a driving assembly is disposed on the base, and an output shaft of the driving assembly is drivably connected to the rotating seat. An end of the connecting arm is connected to the rotating seat, and the other end of the connecting arm is connected to the movable frame. A lifting plate is disposed on the movable frame, a sliding table assembly and a measuring system are disposed on an upper side of the lifting plate. A swivel seat is disposed on an upper side of the sliding table assembly, and the machining assembly is detachably mounted on the swivel seat.

Abstract: An in-situ robot programming method for a hydraulic turbine top cover based on binocular structured light vision is provided, which relates to the field of robot vision-guided intelligent processing technologies. The method performs hand-eye calibration on a binocular structured light camera and a robot to construct a coordinate conversion relationship thereof, collects an annular to-be-processed area of the hydraulic turbine top cover by the binocular structured light camera for joining, and obtains a trajectory and a trajectory plan through point cloud processing algorithms, to thereby achieve a rapid programming for the hydraulic turbine top cover based on guidance of binocular structured light vision. The method adapts to changes in sizes of the hydraulic turbine top cover and take into account real-time performance and robustness, so that impacts of uncertainty factors on the system are greatly weakened, and the method has characteristics of intelligence and high degree of systematization.

Abstract: An EVS pixel operating method and a related apparatus. The method includes: recording, at a first moment, an output voltage generated by an EVS pixel in response to an incident light intensity, to obtain a first voltage; integrating the output voltage with the first voltage as a reference voltage over a predetermined integration duration after the first moment to obtain a voltage variation value; and comparing the voltage variation value with a predetermined voltage threshold range, and outputting an event signal under a condition that the voltage variation value is out of the voltage threshold range.

Abstract: This application provides an optical power commissioning method, a commissioning system, a control device, and a commissioning station. The commissioning system includes a control device and one or more commissioning stations. The method includes the control device first identifies one or more to-be-commissioned services on which optical power commissioning needs to be performed, the control device sends, based on the to-be-commissioned service, commissioning information to the one or more commissioning stations on which the to-be-commissioned service passes through, where the one or more commissioning stations perform parallel optical power commissioning based on the commissioning information, and the one or more commissioning stations perform optical power commissioning based on the commissioning information. According to this application, a plurality of services and a plurality of commissioning stations can be commissioned concurrently.

Abstract: A control circuit for a resonant converter having at least two output signals, the control circuit including: a charge feedback circuit configured to generate a charge feedback signal representing a resonant current of a resonant circuit in the resonant converter; and a switching control signal generating circuit configured to generate switching control signals according to the charge feedback signal and feedback signals representing error information of each of the at least two output signals.

Abstract: A control circuit for a resonant converter, can include: a feedforward circuit configured to generate a feedforward current; a charge feedback circuit configured to receive a resonant current sampling signal representing a resonant current of the resonant converter in a first mode to generate a charge feedback signal, and to receive the resonant current sampling signal and the feedforward current together to generate the charge feedback signal in a second mode; and a driving control circuit configured to generate driving signals according to the charge feedback signal and a first threshold signal, in order to control switching states of power transistors of the resonant converter, where the first threshold signal is generated according to an error compensation signal representing an error information between a feedback signal of an output signal of the resonant converter and a reference signal.

Abstract: Provided are a method and apparatus for measuring a geometric parameter of an object, and a terminal. The method includes: establishing a three-dimensional coordinate system based on a real environment, in accordance with a first depth image of the real environment photographed by a camera component; obtaining pose data of a terminal, obtaining a second depth image and a two-dimensional image of an object to be measured, and displaying the two-dimensional image on a display interface of the terminal; in response to a measurement point selection instruction, determining a coordinate in the three-dimensional coordinate system of a measurement point based on the pose data, the second depth image and the two-dimensional image, and determining a geometric parameter of the object to be measured based on the coordinate; and displaying, in the two-dimensional image, the geometric parameter of the object to be measured.

Abstract: A delta image sensor comprising a plurality of acquisition circuits corresponding to at least one pixel. Each acquisition circuit includes at least one sensor circuit comprising a photosensor to generate a sensor signal, VSIG, depending on a light signal illuminating the photosensor; at least one single slope analogue to digital conversion, A/D, circuit configured to convert a current VSIG to a digital signal, wherein the A/D circuit (12) is configured to use one of a plurality of ramps for the conversion; at least one digital storage circuit configured to store a representation of at least one digital signal corresponding to a previous VSIG; at least one digital comparison circuit configured to compare the level of the stored representation with the current VSIG to detect whether a changed level is present; and at least one digital output circuit configured to generate an event output, in response to the changed level.

Abstract: Provided are an image sensor and an image output method thereof, and an optoelectronic device. The image sensor includes a plurality of pixels, which include a photoelectric detection circuit, a signal readout circuit, a floating diffusion node, an integrating capacitor, a transmission circuit, an adaptive power supply, and a signal processing circuit. The floating diffusion node integrates the photoelectric charge into the integrating capacitor to obtain an integral voltage. The signal processing circuit generates a logarithmic voltage and a logarithmic current. After the floating diffusion node receives the photoelectric charge, the target voltage is much less than the reference voltage. The node current is the photocurrent, and the node voltage is the integral voltage. When the target voltage increases to the reference voltage, the node current is the logarithmic current, and the node voltage is the logarithmic voltage, so the signal readout circuit finally outputs the corresponding image signals.

Abstract: A zero-voltage-switching control circuit for a switching power supply having a main power switch and a synchronous rectifier switch, is configured to: control the synchronous rectifier switch to be turned on for a first time period before the main power switch is turned on and after a current flowing through the synchronous rectifier switch is decreased to zero according to a switching operation of the main power switch in a previous switching period of the main power switch; and where a drain-source voltage of the main power switch is decreased when the main power switch is turned on, in order to reduce conduction loss.

Abstract: A controller of a switching power supply can include: a frequency-jittering control circuit configured to generate a first frequency-jittering signal and a second frequency-jittering signal; where a jittering range of an operating frequency of a power transistor in the switching power supply is adjusted by the first frequency-jittering signal; and where a jittering amplitude of a peak value of an inductor current of the switching power supply is adjusted by the second frequency-jittering signal.

Abstract: Provided are an image sensor and an image output method and application thereof. The image sensor includes an input circuit, configured to perform a first photoelectric conversion on incident light to generate a photoelectric current in an EVS mode working period, and performs s second photoelectric conversion on the incident light to generate photoelectric charges in an APS mode working period; an EVS circuit configured to output a corresponding event signal according to a difference value between a first voltage corresponding to a photoelectric current and a reference voltage; an APS circuit configured to output a corresponding grayscale signal according to a second voltage corresponding to photoelectric charges; and a control circuit configured to output a corresponding APS image according to the grayscale signal and output a corresponding EVS image according to the event signal.

Abstract: A delta image sensor comprising an arrangement of pixels and a plurality of acquisition circuits corresponding to at least one pixel. Each acquisition circuit includes at least one sensor circuit comprising a photosensor to generate a sensor signal, VSIG, depending on a light signal; at least one analogue to digital conversion, A/D, circuit configured to convert a current VSIG to a digital signal; at least one digital storage circuit configured to store a representation of at least one digital signal corresponding to a previous VSIG; at least one digital comparison circuit to compare the level of the stored representation with the current VSIG to detect whether a changed level is present; and at least one digital output circuit configured to generate an event output under the condition of the changed level. A digital representation may be externally written to the digital storage circuit of the at least one pixel.

Abstract: A delta image sensor comprising an arrangement of pixels and acquisition circuits corresponding to at least one pixel. Each acquisition circuit includes a sensor circuit comprising a photosensor to generate a sensor signal, VSIG, depending on a light signal illuminating the photosensor; at least one analogue to digital conversion, A/D, circuit configured to convert a current VSIG to a digital signal; at least one digital storage circuit configured to store a representation of at least one digital signal corresponding to a previous VSIG; a digital comparison circuit configured to compare the level of the stored representation with the current VSIG to detect whether a changed level is present; and a digital output circuit configured to generate an event output when the level has changed. The repeat rate of the analogue to digital conversion is chosen from one or more repeat rates corresponding to modulation of the light signal.