1239 results about "Master controller" patented technology

The invention discloses a circulating type gravity energy storage transportation system which comprises a master controller, an annular rail, a high-position storage yard and a low-position storage yard, a transportation train is composed of a plurality of carriages which are flexibly connected and arranged on the annular rail, a low-position running rail is arranged on the annular rail, the high-position running rail is provided with a linear loading and unloading section, and the low-position running rail is provided with a linear loading and unloading section. A plurality of grabbing parts are arranged on the high-position storage yard and the low-position storage yard and move back and forth between the loading and unloading section and the stacking area, and the hoisting device is electrically connected with the master controller. By means of the double-circulation design of train circulation operation and heavy block rapid loading and unloading, the core pain points that an existing gravity energy storage system is not coherent in operation and low in efficiency are effectively solved, and the energy storage efficiency is improved. And a reliable system solution is provided for realizing large-scale, high-efficiency and fast-response gravity energy storage commercialized application.

The invention discloses a dynamic monitoring-based deaerator water supply control method and system for a nuclear power plant, and relates to the field of deaerator water supply control, and the method comprises the steps: firstly, through a hybrid online identification algorithm, analyzing a historical valve position instruction and a water supply flow sequence in real time, and dynamically estimating the local gain and hysteresis width of a valve under the current working condition; then, the parameters identified in real time are utilized to carry out prospective compensation on the expected flow variation calculated by the main controller. In other words, the instruction amplitude is adjusted according to the estimated local gain, and it is ensured that consistent flow response can be obtained under different loads; meanwhile, when the instruction is reverse, the compensation amount is actively applied according to the estimated hysteresis width so as to eliminate the adjustment dead zone and oscillation caused by hysteresis. In this way, the nonlinear object of the valve is equivalent to a linear link with consistent response, and the stability and accuracy of the deaerator water level control system in the full working condition range are remarkably improved.

The invention relates to the technical field of lasers, in particular to a laser heat management device and a control method thereof, the laser heat management device comprises a cooling substrate, the cooling substrate is internally provided with a micro-channel, the micro-channel comprises a main channel and a branch channel, and the main channel is used for circulating cooling water; the cooling substrate is provided with a detection control area, the detection control area is located at the joint of the branch channel and the main channel, the detection control area is provided with a phase change micro-valve and a detection assembly, the detection assembly is used for collecting temperature data, the phase change micro-valve comprises a phase change material and a flexible separation blade, and after the valve is opened, the phase change material generating phase change pushes the flexible separation blade, and the phase change micro-valve is connected with the detection assembly. The communication state of the main channel and the branch channel is controlled; the main controller is used for receiving the temperature data of all the detection control areas and controlling the valves of the corresponding detection control areas to be opened or closed according to the deviation between the temperature data and the target temperature. The temperature gradient of the laser can be reduced at least so as to ensure that the laser realizes a long-term stable working state.

The invention discloses a ship propulsion control system and method, and relates to the technical field of ship engineering.The ship propulsion control system comprises an acquisition module used for acquiring analog quantity signals during ship propulsion, and a main controller module used for receiving the analog quantity signals and generating a propulsion control instruction; according to the ship propulsion control system, two acquisition channels are arranged for analog quantity signals, a fault channel is rapidly detected and switched in combination with a self-checking mechanism, the fault channel can be rapidly detected, the fault channel can be rapidly switched, the fault channel can be rapidly detected, the fault channel can be rapidly switched, and the reliability of the ship propulsion control system can be improved. A digital quantity output channel fault is found in time and switched to a standby channel, a power supply and communication interface backup strategy is perfected, fault priorities are accurately divided, corresponding measures are taken, the strict requirements of modern ships for high reliability and high safety of propulsion control are met, and powerful technical support is provided for stable navigation of the ships.

The invention provides a servo press control system and method based on a time-sensitive network, and relates to the technical field of intelligent manufacturing and industrial automation control, and the system comprises a time-sensitive network TSN which is used for providing global time synchronization and deterministic data transmission; a main controller of the multi-axis servo control unit is used for issuing a motion control instruction and a feeding and discharging control instruction through a TSN. A robot controller in the robot feeding and discharging unit is used for driving an industrial robot to execute plate taking and placing operation under the action of the feeding and discharging control instruction. The visual monitoring unit comprises an industrial camera accessed to the TSN and is used for collecting images and transmitting image data to the edge computing node through the TSN; the edge computing node is used for processing the image data to generate a compensation instruction and feeding back the compensation instruction through the TSN; and the upper monitoring system is used for subscribing real-time data published by the edge computing nodes, so that the control range of the servo pressure control system is expanded, and the convenience of data transmission and interaction is improved.

The invention discloses a predetermined time expansion state observer generation method and an observation error convergence method, which are applied to the technical field of aerospace, and comprise the following steps: constructing a controller for a second-order nonlinear system according to an all-drive system theory; converting the second-order nonlinear system according to the controller to obtain an all-drive system based on the main controller; wherein the main controller is a controller for controlling the all-wheel-drive system; designing a predetermined time expansion state observer based on the total disturbance and observation error of the all-wheel-drive system; wherein the predetermined time expansion state observer is an observer which limits the upper bound of convergence time of the observer based on a predetermined time parameter. Compared with most existing extended state observers which can only ensure asymptotic convergence and finite time or fixed time convergence, the observer generated based on the predetermined time extended state observer generation method can ensure that the observation error converges within the predetermined time, so that the converged predetermined time is more stable; and the user experience is improved.

The invention discloses a multipath load control acquisition device and system and a load control acquisition method, the device adopts an architecture in which a master device and a slave device cooperate, the master device comprises a master controller, a master communication module, a user display interface and a master interface unit, and the slave device comprises a slave interface unit, a slave controller, an acquisition unit and a slave communication module. Flexible marshalling management is achieved by distributing electronic identity numbers to the breakers, load parameters and the states of the breakers are synchronously collected through the collection unit, a two-way data transmission channel is constructed by means of the master-slave communication module, a control signal is generated based on preset logic and real-time data through the master controller, and the state of the breakers is controlled. And the slave controller issues an instruction to drive the circuit breaker electric operation mechanism to realize millisecond-level rapid switching-on and switching-off operation. According to the invention, the problems of insufficient number of loops, lack of state monitoring, slow response and the like of an existing load control system are solved, and accurate, rapid and intelligent management of multi-path loads on a client side is realized.

The invention provides an intelligent motion control system based on multi-level expansion and multi-type motor compatibility, and aims to solve the technical problems that an existing motion control system is poor in expansibility and weak in motor type compatibility. The system comprises a main controller, a configuration memory and at least one detachable motor control module, the motor control module comprises a motion controller and a motor driver. The core of the method is that when a main controller is initialized, motor type parameters preset for all motor shafts are read from a configuration memory, and differential configuration is executed according to the motor type parameters: when a motor is of a first preset type, a motion controller and a motor driver are cooperatively configured; and when the motor is of the second preset type, only the motion controller is configured to output pulse / direction signals, and the motor driver is disabled. Through software and hardware decoupling, the number of shafts can be flexibly increased or decreased without changing hardware, various motors and encoders are compatible, the expansibility and deployment efficiency of the system are remarkably improved, and the development and maintenance cost is reduced.

The invention relates to the technical field, and discloses an intelligent management method and system for oxygen inhalation, and the method comprises the steps: setting an oxygen flow mixing ratio and a quantitative parameter according to an expected treatment effect, and setting a simulation control for an operator to adjust the oxygen flow mixing ratio in real time; a plurality of sensors are connected to a main controller, data acquisition and state monitoring are carried out through the sensors, and oxygen flow acquisition and air mixing proportion are quantitatively displayed and charged; an air-oxygen proportional electromagnetic valve is arranged, a main controller receives a starting instruction, the air-oxygen proportional electromagnetic valve is controlled according to data collected by a sensor, the flow of mixed gas flowing through the proportional valve and the oxygen proportion are accurately controlled, and remote flow control and program control over oxygen supply are achieved. By means of the method, an intelligent management system for oxygen inhalation is achieved, the whole machine is easy to operate through intelligent control, it is guaranteed that the oxygen flow is adjusted in real time according to the needs of a patient, and the dynamic needs are kept consistent.

The invention relates to the technical field of cable fault positioning, in particular to a cable fault accurate positioning method based on multi-channel synchronous acquisition, which comprises the following steps: S1, constructing a multi-channel adaptive acquisition system which comprises a main controller, a multi-channel acquisition module, a synchronous control module and a data transmission module; s2, multi-channel data synchronous acquisition is carried out through the synchronous control module, wherein the multi-channel data comprises impedance data, temperature data, partial discharge signals and insulation resistance data; during use, through a multi-channel adaptive acquisition design, monitoring channels can be flexibly selected according to cable materials, operation years and environmental conditions, different aging fault characteristics are comprehensively covered, the fault omission ratio and the false alarm rate are reduced, different types of low-voltage cables are adapted, a synchronous scheme of constant-temperature crystal oscillator and hardware triggering is adopted, and the reliability of the system is improved. The method does not need to depend on a GPS / PTP time service module, is favorable for saving cost input, and eliminates environmental interference and single parameter false triggering.

The invention provides a VR visual training method and system based on dynamic refraction adjustment, and is applied to the technical field of VR visual training, and the system comprises a display module, a focusing mechanism, a hybrid optical system and a main controller. The main controller generates a target diopter sequence changing along with time according to the training mode, and drives the optical lens group to move along the optical axis direction, so that the focal power of the system is physically changed; meanwhile, the virtual image depth is updated according to the diopter, and perspective parameters are adjusted and rendered, so that the position of the presented virtual image is consistent with the optical focus in real time; in the training process, the adjusting reaction speed and the adjusting lag amount are obtained through the clear recognition performance of the user on the sighting mark, the main controller conducts self-adaptive adjustment on the follow-up refraction change track based on feedback, and training stimulation is made to be matched with the instant adjusting ability of the user. A real, continuous and individualized adjusting stimulation environment can be constructed, and the effectiveness and safety of ciliary muscle training are improved.

The invention discloses a configuration drift detection and consistency coordination method during operation of a Changsafety chain, and relates to the technical field of distributed system configuration management, the method comprises the following steps: deploying a main controller and a query-side double container in an Operator controller Pod, setting a client tool and a hierarchical cache in the query-side, and obtaining on-chain configuration by the main controller through a localhost interface; in the Recencile cycle, configuration drift is judged through standardization processing and hash comparison, and a change source is recognized in combination with self-defined resource metadata and chain side change metadata; coordination is executed according to four synchronization modes of CR forcing, chain observation, bandwidth period CR forcing and manual arbitration; according to the scheme, the problems of state fuzziness, error coverage and the like caused by dual fact sources are solved, low-delay detection and flexible coordination are achieved, and configuration consistency during running of the long safety chain is guaranteed.

A detonator includes a substrate, a controller mounted to the substrate, and a sensor coupled to the controller to measure a temperature, pressure, acceleration or other environmental parameter of the detonator. The controller is configured to transmit the measured environmental parameter from the detonator to a remote master controller, execute an action in response to a value of the measured environmental parameter, and / or prevent or modify at least one detonator function in response to the value of the measured environmental parameter.

The invention belongs to the field and particularly relates to an electric arc welding machine which comprises an electric arc welding device and a robot, the electric arc welding device comprises an electric arc welding gun and a control device which are installed at the execution end of the robot, and the control device comprises a main controller, a motion controller, a man-machine interaction module and a singular point avoiding system. In the process that the robot loads the arc welding gun to execute a welding task, singular points in a welding track are found and avoided through the singular point avoiding system. According to the electric arc welding machine, the singular point avoiding system is integrated in the control device, and the singular point avoiding system is used for discovering and avoiding singular points in a welding track in the process that the robot is loaded with the electric arc welding gun to execute a welding task. Therefore, continuous welding operation is effectively guaranteed, continuity and smoothness of the welding process are achieved, the quality problem caused by welding interruption is avoided, and whole-course intelligent welding is achieved.

The invention relates to the technical field of unmanned aerial vehicle application, and discloses a multi-degree-of-freedom dynamic light field system based on an unmanned aerial vehicle, a cooperative control method of the multi-degree-of-freedom dynamic light field system and a dynamic light field device. The ground control station is used for editing programs and sending instructions; the unmanned aerial vehicle group is composed of a plurality of unmanned aerial vehicles carrying the dynamic light field devices; the communication unit is used for establishing a data link between the ground control station and the unmanned aerial vehicle group; and the main controller on each unmanned aerial vehicle sends cooperative control signals to the flight control system, the first driving mechanism and the second driving mechanism of the unmanned aerial vehicle. Through the synergistic effect of the first driving mechanism and the second driving mechanism, the rotation of the rotating drum in the vertical direction can be controlled, and meanwhile, the rotation of each ball head assembly in the horizontal direction can also be controlled, so that irradiation of each laser module in different azimuth angles within a certain angle range can be realized, and the display effect of the unmanned aerial vehicle group light curtain is improved.

A fail-safe control method of an electromechanical brake apparatus comprising a plurality of wheel controllers, a main controller, and an auxiliary controller that control electromechanical brakes disposed on each wheel of a vehicle, the method comprising: deciding a self-status of each of the plurality of wheel controllers, the main controller, and the auxiliary controller based on pre-classified status information; sharing self-status decided by each of the plurality of wheel controllers, the main controller, and the auxiliary controller; determining a status of one another based on the shared self-status among the plurality of wheel controllers, the main controller, and the auxiliary controller; activating a pre-designated fail-safe mode based on status information of each of the plurality of wheel controllers, the main controller, and the auxiliary controller; and performing emergency braking of the vehicle based on the pre-designated fail-safe mode or maintaining the vehicle in a drivable status.

The embodiment of the invention provides a split-brain processing method and device, electronic equipment and a computer readable storage medium, and relates to the technical field of communication. The split-brain detection node is any network device in a plurality of network devices housed and managed by the SDN controller cluster, receives a message sent by the SDN controller cluster, and determines a message source and a message type and a state of a management session between the main controller and the split-brain detection node according to a session tracking flow table; if the message is in the established state, a management session response message is sent to the main controller under the condition that the message is a management session keep-alive message sent by the main controller, so that the main controller maintains a main role; and when the message is the management session request message sent by the standby controller, the management session request message is discarded, so that the standby controller maintains a standby role, and the split-brain risk is effectively avoided while the system complexity and the operation and maintenance cost are not increased.

The invention relates to a working method of a vehicle control system of a redundant electrical architecture, belongs to the technical field of redundant control systems, and solves the problem that an existing control system is poor in reliability. The method provided by the invention comprises the following steps: during starting, the main controller is defaulted to be an effective controller in the controller group with the backup, the hot backup controller monitors whether the main controller is in an abnormal state or not through a heartbeat signal, a fault signal and a first verification signal of the main controller, and if the main controller is in the abnormal state, the main controller is controlled to be powered off; the hot backup controller is switched to an effective controller; the cold backup controller monitors whether the hot backup controller is in an abnormal state or not through a fault signal, a heartbeat signal and a second verification signal of the hot backup controller; if the hot backup controller is in the abnormal state, the hot backup controller is controlled to be powered off, the control mode of the cold backup controller is activated, and the cold backup controller is switched to the effective controller. According to the invention, the reliability of the system is improved through effective arbitration of the effective controller.

The invention relates to the technical field of off-grid renewable energy hydrogen production, and discloses an off-grid alkaline hydrogen production system and a power adaptive distribution and safety control method thereof, the off-grid alkaline hydrogen production system comprises a renewable energy power supply unit, a parallel electrolytic cell module, a gas-liquid treatment system and a main controller; in the Faraday hydrogen production mode, the bubble volume is compressed by adjusting the operation pressure so as to modulate the impedance characteristic of the electrolytic cell, and the energy efficiency is improved in cooperation with current control; and in the non-Faraday polarization hot standby mode, the voltage of the rectifier cabinet is controlled to be clamped to a non-gassing polarization interval, and liquid level plugging is constructed in the U-shaped communicating pipeline according to the fluid statics principle. The system is further provided with a transient buffering strategy based on the pneumatic capacity, and pressure attenuation is delayed through the gas dead zone volume when power is suddenly reduced. The problems of hydrogen production efficiency optimization, low-power safe hot standby and mechanical protection under wide power fluctuation are effectively solved.

The invention provides a communication method and system of power electronic equipment, electronic equipment and a storage medium. The method comprises the following steps: a master controller sends a data frame of a current period to a recently connectable slave controller; the slave controller receives a data frame sent by the master controller or a previous connectable slave controller in the current period, writes a current state parameter of the corresponding power electronic equipment into the data frame, and sends the written data frame to a next connectable slave controller or the master controller; when any slave controller detects that a fault occurs, the fault slave controller sends a fault frame to the master controller; the master controller responds to the fault frame and sends an isolation instruction to a target slave controller according to the fault frame; the target slave controller responds to the isolation instruction, communication between the target slave controller and the fault slave controller is isolated based on the standby network cable, and the fault slave controller is determined to be a slave controller which cannot be communicated. According to the invention, the real-time performance and stability of an electronic power equipment communication system can be improved.

The invention provides a safe starting method and device of a programmable logic controller, a PUF circuit, a starting control unit and a password authentication unit are integrated on a main controller chip of a PLC system, and the method comprises the following steps: responding to power-on of the PLC system, activating the PUF circuit and generating a device root key; the starting control unit activates and operates the starting state machine; under the control of the starting state machine, the starting control unit executes the following step-by-step verification and loading processes: reading a code of a first-stage boot loader from a boot read-only memory of the PLC system, and checking; in the first stage, the boot loader reads encrypted firmware data and checks the encrypted firmware data; loading an operating system component or an application program of the PLC system, and checking; and if the inspection is passed, entering an operation state, and executing a corresponding industrial control task by the PLC system. Firmware tampering and unauthorized code execution are effectively resisted, and the starting safety and the operation reliability of the PLC system are comprehensively enhanced.

The invention belongs to the technical field of flow measurement and control, and discloses a laminar flow mass flow control system and method based on feed-forward compensation and cascade control. In the system, a laminar flow element is provided with a low-voltage side detection port and a high-voltage side detection port; the low-pressure side detection port is connected with the low-pressure ends of the pressure sensor and the differential pressure sensor, and the high-pressure side detection port is connected with the high-pressure end of the differential pressure sensor; the laminar flow element is connected with the regulating valve; the output end of the pressure sensor is connected with the input end of the feedforward compensation module; the output end of the A / D converter is connected with the input end of the main controller and the input end of the auxiliary controller; the output end of the main controller is connected with the input end of the auxiliary controller. The output end of the feed-forward compensation module is connected with the control end of the regulating valve; the output end of the auxiliary controller is connected with the control end of the adjusting valve through the D / A converter. The feed-forward compensation and cascade control technology is adopted, the pressure feed-forward compensation module and the differential pressure pair control loop are additionally arranged, and the problem that the flow precision of a control system is not accurate due to sudden change of fluid pressure is solved.

The invention discloses a fully mechanized coal mining face intelligent dust falling method based on infrared positioning, and relates to the technical field of automatic control. The method comprises the following steps: step 1, initializing state codes of all cells in a spray planning table into preset blank state codes; 2, the current position and the advancing direction of the coal mining machine are determined according to the field snapshot, an event triggering window is generated around the support address, and a corresponding spraying state code is written into the event triggering window; 3, configuring execution parameters for each function section under the condition that a plurality of spraying state codes exist in the same support address, generating a packet scheduling time sequence, and finally forming a spraying task queue; and 4, the main controller issues the spraying task queue to a spraying execution unit so as to drive the combined electric ball valve and the nozzle group to execute opening and closing actions. According to the invention, a space-time continuous fog curtain can be formed on a dust diffusion path, the dust trapping efficiency is effectively improved, and the waste of water resources is reduced.

The invention discloses a combined multi-rotor unmanned aerial vehicle system composed of independent rotor unmanned aerial vehicles, and relates to the technical field of unmanned aerial vehicles. The multi-rotor unmanned aerial vehicle system comprises a plurality of multi-rotor unmanned aerial vehicles with independent flight capability, a combined connecting bracket, a main / standby controller system, a distributed energy system, a navigation communication module and a task load, each unmanned aerial vehicle is quickly combined with a separable locking mechanism through a magnetic type interface, is uniformly powered and communicated by a bracket, and is uniformly dispatched by a main controller in a combined state to form an integrated aircraft; during separation, automatic decoupling can be realized, and an independent operation mode is switched; the system adopts a virtual motor set to realize cooperative flight control, combines main controller election, health monitoring and a dual-trigger separation mechanism, and has high fault tolerance and task flexibility; the support integrates the solar film and the battery pack, prolongs the endurance time, and is suitable for diversified task scenes such as reconnaissance, communication relay or weapon delivery.

The invention relates to the technical field of intelligent control network application programming, and discloses an application programming method based on an ArtNet module, which is applied to an intelligent control network. The method comprises the steps that an ArtNet module storage medium is partitioned, firmware is received and verification information is stored, the validity of the firmware is judged, the firmware is transmitted to a main controller according to a preset upgrading protocol, the main controller distributes updates, and the ArtNet module clears temporarily stored data. According to the application, the intelligent control network master controller is an internal communication bus master device, the function nodes maintain the original access logic, only an ArtNet module is newly added as a slave device to access the internal bus, an independent communication link is established through a universal interface and the master controller, the Ethernet and the external control bus are externally connected, original hardware and an IAP protocol do not need to be changed, and the communication efficiency is improved. Equipment transformation and code rewriting cost caused by module expansion are avoided; based on the programming process, original IAP logic is not interfered, repeated burning caused by data residue is avoided, and the method is suitable for firmware upgrading of intelligent control networks such as moving head lamps, stage lighting and intelligent lighting.

The utility model relates to the technical field of water pump production, in particular to semi-automatic water pump assembly line production equipment. The production line comprises a stator feeding station, a wave spring mounting and oiling station, a rotor part press-fitting station, a rear cover press-fitting station, a screw locking station, a static ring press-fitting station, an impeller press-fitting station, an electric measurement station, a gas measurement station, a line body and a PLC (Programmable Logic Controller) general controller, the stator feeding work station, the wave spring mounting and oiling work station, the rotor part press-fitting work station, the rear cover press-fitting work station, the screw locking work station, the static ring press-fitting work station, the impeller press-fitting work station, the electric measurement work station and the gas measurement work station are sequentially arranged in the conveying direction of the line body and are in butt joint with the line body, and the PLC master controller is connected with the work stations and the line body and controls the work stations and the line body. The assembly line can achieve semi-automatic production of water pumps, saves labor cost, reduces labor intensity of workers, improves production efficiency and improves the automation degree of enterprises.

The invention relates to the technical field of intelligent peripherals, in particular to a user-oriented interaction information expansion method, which comprises the following steps that: each keycap acquires displacement and pressure, generates an event packet, uploads the event packet through an optical wireless link, and obtains a clock and supplies power; constructing a keycap graph by a master controller, obtaining an intention vector through graph convolution and pooling, inputting the intention vector into a cyclic network to generate a pixel matrix and a phase matrix, and downlink after Bernoulli sparse coding; performing key cap side orthogonal matching pursuit decoding and four-round gradient optimization, and outputting a differential pixel set, a differential phase set and a synchronization mark; the master control refreshes the digital micromirror array and the ultrasonic phased array in a differential manner, locks a frame-level time sequence through a synchronization pulse, compensates link delay and hardware drift in real time based on Kalman filtering, and keeps an optical-acoustic alignment error to be less than 100 microseconds; degradation monitoring enables a link to be automatically switched to a pre-carved character layer and to be quickly recovered when the link is abnormal, and a keyboard interaction information expansion scheme with low delay and high consistency is provided.

The present disclosure discloses a multifunctional side impact block control system and a child safety seat including the same. The multifunctional side impact block control system includes a seat body, a side impact block movably mounted on a left side surface and / or a right side surface of the seat body, a main controller, and a functional module integrated in the side impact block. The side impact block and the functional module are in communication connection with the main controller. The functional module includes one or more of an interaction unit, an entertainment unit, an environment adjustment unit, a safety unit, and a welcoming unit. The side impact block movably mounted on the side surface of the seat body can be easily operated by a user, making the interaction more intuitive and providing a control region that better meets the requirements in practical applications, thereby providing great convenience.

The invention relates to the technical field of water turbine generator set installation and maintenance, and discloses an intelligent water turbine runner test device and method, and the device comprises a hydraulic control unit which is used for providing and adjusting pressure oil for a constant-pressure cavity, an opening cavity and a closing cavity of a water turbine runner; and the main controller is used for receiving a user instruction, calling an automatic control logic according to a selected test item, driving the hydraulic control unit to execute a corresponding oil path action, and receiving and processing the cavity pressure of the runner hub, the servomotor stroke and the blade rotation angle parameter which are acquired in real time so as to automatically complete the runner test item specified by the national standard. The test process is automatically executed through the main controller, and frequent manual operation is replaced by simple clicking, so that the labor intensity of operators is greatly reduced.

A power supply control device, which is a main controller of a switching power supply, includes an error amplifier, a ramp signal generation circuit, a comparison signal generation circuit, a logic circuit, a switch drive circuit, a reverse current detection circuit, and a ramp signal holding circuit. The logic circuit adjusts an input offset of the comparison signal generation circuit, the error signal, or the ramp signal in a direction that reduces a difference between the error signal and the ramp signal in response to a predetermined trigger signal.