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48results about How to "Timely shutdown" patented technology
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A gain controllable two-segment erbium-doped optical fiber amplifier
InactiveCN101217319ANo power consumptionIncrease signal gainElectromagnetic transmissionAudio power amplifierOptical isolator
The invention belongs to the technical field of optical fiber amplifiers, which more particularly relates to a two-section erbium-doped optical fiber amplifier which has two sections and can control the gain. The optical fiber amplifier comprises a two-section erbium-doped optical fiber amplifying part and a gain control part, wherein the two-section erbium-doped optical fiber amplifying part comprises a 980mn pump laser source, a two-section erbium-doped optical fiber, an optical isolator, a signal and pump multiplexer, and a signal and pump demultiplexer; the gain control part comprises the signal input and output and the power measurement of output return light, as well as a controller of the pump laser device. The two-section optical circuit structure can effectively isolate an ASE noise in counterpropagation, thus optimizing the noise isolation performance of the amplifier. The gain control part can implement the gain control and optimization of the amplifier by monitoring the output power of the pump laser device.
Owner:FUDAN UNIV
Detection device and method used for rope disorder in process of multi-layer winding around reel
InactiveCN104528569AGuaranteed uptimeReduce frictionFilament handlingWinding mechanismsBand shapeCoupling
The invention discloses a detection device and method used for rope disorder in the process of multi-layer winding around a reel, and belongs to a rope winding detection device of a winch. Contact switch supports of a detection mechanism of the device are installed between a linear bearing and a lead screw nut, and contact switches are connected to the contact switch supports. A detection device support is installed in front of the reel, bearing pedestals and a motor support are installed on the detection device support, a lead screw motor is installed on the motor support and connected with a lead screw through a lead screw coupler, the lead screw nut is installed on the lead screw, and optical shaft supports are installed on the bearing pedestals. An optical shaft is locked on the optical shaft supports through locking bolts, the linear bearing is installed on the optical shaft, an encoder is installed on an encoder support, the encoder support is installed on a reel support, the encoder is connected with the reel through a reel coupler, and the signal wire of the encoder and the signal wires of the strip-shaped contact switches are connected to the input end of a PLC. The detection device can conveniently, rapidly and accurately monitor rope running of the reel on line, it is avoided that because steel wire ropes are disorderly wound, rope damage or breakage occurs, and the service life of the steel wire ropes is prolonged.
Owner:CHINA UNIV OF MINING & TECH
Parallel connection type active power filter
ActiveCN103683290AAccurate calculationGood choiceActive power filteringHarmonic reduction arrangementConnection typeHarmonic
A parallel connection type active power filter comprises a current collecting unit, a voltage collecting unit, an IGBT drive unit, an IGBT switch unit and a grid access unit. The parallel connection type active power filter is further characterized in that a DSP chip, an FPGA chip, a grid access current collecting unit and a system operation state collecting unit are further included, the output of the current collecting unit and the output of the voltage collecting unit are respectively connected with the A / D input end of the DSP chip, the DSP chip is used for instruction current signals opposite to detection harmonic signals of a power grid in direction, the FPGA chip modulates PWM output signals according to the instruction current signals and outputting the PWM output signals to the IGBT drive unit, the IGBT drive unit drives the IGBT switch unit to form harmonic currents (compensation currents), the harmonic currents are injected into the power grid through the grid access unit, the grid access current collecting unit collects compensation current signals output by the grid access unit and outputs the compensation current signals to the FPGA chip, and at least the FPGA chip uses the compensation current signals to modulate the PWM output signals. Compared with the prior art, the parallel connection type active power filter improves the flexibility, the reliability and the safety of application.
Owner:深圳市三和电力科技有限公司
Discharge lamp having cooling means
InactiveCN1669115AImprove efficiencyNot adversely affected by shieldingLighting heating/cooling arrangementsHigh-pressure discharge lampsEngineeringHigh intensity
A discharge lamp, and particularly a high-pressure gas-discharge lamp (an HID (high-intensity discharge) lamp or UHP (ultra-high performance) lamp), having a reflector and a cooling means is described. The cooling means comprises at least one nozzle ( 3 ) by which a flow of gas can be directed onto the discharge lamp, the at least one nozzle ( 3 ) being so arranged that it does not extend, at least to any substantial degree, into a beam path produced by the lamp ( 2 ) and the reflector ( 1 ). In this way, the cooling means does not produce any obstacles on the beam path for the light. With preferred embodiments, it is possible to produce a turbulent flow that surrounds particularly the discharge vessel ( 21 ) of the lamp and that considerably increases the effectiveness of the cooling means. Further embodiments also allow the discharge lamp to be operated in a plurality of different positions without individual regions of the lamp being too little or too severely cooled.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Discharge lamp having cooling means
InactiveCN100385607CNot adversely affected by shieldingStrong coolingLighting heating/cooling arrangementsHigh-pressure discharge lampsGas-discharge lampLight beam
A discharge lamp, and particularly a high-pressure gas-discharge lamp (an HID (high-intensity discharge) lamp or UHP (ultra-high performance) lamp), having a reflector and a cooling means is described. The cooling means comprises at least one nozzle ( 3 ) by which a flow of gas can be directed onto the discharge lamp, the at least one nozzle ( 3 ) being so arranged that it does not extend, at least to any substantial degree, into a beam path produced by the lamp ( 2 ) and the reflector ( 1 ). In this way, the cooling means does not produce any obstacles on the beam path for the light. With preferred embodiments, it is possible to produce a turbulent flow that surrounds particularly the discharge vessel ( 21 ) of the lamp and that considerably increases the effectiveness of the cooling means. Further embodiments also allow the discharge lamp to be operated in a plurality of different positions without individual regions of the lamp being too little or too severely cooled.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Intelligent monitoring system of packing box
InactiveCN104678919AEasy to monitorSmall footprintMeasurement devicesTotal factory controlVibration accelerationMonitoring system
The invention discloses an intelligent monitoring system of a packing box. The intelligent monitoring system comprises a sensor system, a data acquisition unit, a data transmission unit and a data monitoring unit, wherein the sensor system consists of a plurality of sensors with different functions, and the sensor system is used for acquiring a corresponding temperature signala humidity signal, pressure difference signal, dip angle signal and vibration acceleration signal; the data acquisition unit is used for acquiring the temperature signal, the humidity signal, the pressure difference signal, the dip angle signal and the vibration acceleration signal, packing the signals and transmitting to the data transmission unit; the data transmission unit is used for transmitting the received data to the data monitoring unit; the data monitoring unit is used for receiving the data, storing the data as historical data, also judging whether the data fall in a threshold value range and generating an alarm signal when the data do not fall in the preset range, and the alarm signal is transmitted by the data transmission unit to the data acquisition unit. The intelligent monitoring system is convenient for monitoring the packing box and small in occupied space.
Owner:SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
High power optical fiber laser key point protection device
InactiveCN106654812ATimely shutdownAvoid thermal load damageLaser detailsPower controllerAlarm device
A high power optical fiber laser key point protection device is disclosed and comprises an optical fiber (1), and the optical fiber has a melting point position (2). The high power optical fiber laser key point protection device is characterized in that the optical fiber (1) centered around the melting point position (2) is uniformly wrapped with heat conduction and light guiding glue (4), and the optical fiber (1) wrapped with the heat conduction and light guiding glue (4) is mounted on a heat dissipation base plate (3); a pressure sensor (5) is mounted above the middle of a part, positioned at one side of the optical fiber (1), of the heat conduction and light guiding glue (4); a first minisize temperature sensor (6), a second minisize temperature sensor (7) and a third minisize temperature sensor (8) are respectively mounted above one end, the middle and the other end of a part, positioned at the other side of the optical fiber (1), of the heat conduction and light guiding glue (4); the pressure sensor (5), the first minisize temperature sensor (6), the second minisize temperature sensor (7) and the third minisize temperature sensor (8) are respectively connected with an alarm device (9); the alarm device is connected with a laser power source controller (10). Via the high power optical fiber laser key point protection device, the melting point position of the optical fiber can be well protected.
Owner:CHINA WEAPON EQUIP RES INST
Thermal protection circuit of thyristor
InactiveCN107123967AShorten the timeReduce processing timeEmergency protective arrangements for automatic disconnectionSignal processing circuitsEngineering
The invention discloses a thermal protection circuit of a thyristor. The thermal protection circuit comprises a power supply circuit, a temperature detection circuit, a temperature signal processing circuit, a proportional integral circuit, a voltage comparison circuit and a signal driving circuit. According to the technical scheme of the thermal protection circuit of the thyristor, due to the arrangement of a hardware detection circuit and a signal processing circuit, the thyristor can be timely cut off when the temperature is abnormal. Therefore, the thyristor is prevented from being burnt. The temperature abnormality processing speed is effectively improved and the processing time is reduced. A fault signal is generated timely and explicitly, and the thermal protection performance of the thyristor is greatly improved. The circuit has relatively high practical value and wide application prospect.
Owner:合肥联信电源有限公司
Digital large-power high-frequency inversion controller for direct-current power supply and method of controller
InactiveCN102969897ASimple power output controlImprove reliabilityApparatus with intermediate ac conversionElectric variable regulationLow voltageComplex programmable logic device
The invention discloses a digital large-power high-frequency inversion controller for a direct-current power supply and a method of the controller. The controller comprises a current measurement circuit, a voltage measurement circuit, a power given circuit, an over-current protection circuit, an overheating protection circuit, a phase loss protection circuit, a keyboard circuit, a micro-processor, a displayer, a complex programmable logic device (CPLD), a first drive circuit, a second drive circuit, a third drive circuit, a fourth drive circuit, a fifth drive circuit, a sixth drive circuit, a digital / analog (D / A)conversion circuit, a switching signal output circuit and a power supply circuit. According to the digital large-power high-frequency inversion controller for the direct-current power supply and the method of the controller, an electronic design automation (EDA) technique is used to be combined with the micro-processer control and the CPLD, and the micro-processor is used to control the CPLD to produce square-wave signals with adjustable duty ratios and frequencies, so that the power supply output power changes according to requirements, and the output power level is controlled by the micro-processor control, accordingly, a low-voltage, large-current and direct-current power supply is obtained through rectification. Output energy of the power supply can supply heat for a mono-crystal furnace graphite heater, the temperature control accuracy is high, and strict temperature requirements of mono-crystals in growth stages can be met.
Owner:JIANGSU QINGNENG POWER SUPPLY
A switching power supply and a control chip thereof
The invention discloses a switching power supply and a control chip thereof. The control chip comprises a logic circuit, an OCP comparison circuit, a driving circuit, a power switch transistor circuitand a PWM signal pulse width sampling and comparison circuit. The output end of the logic circuit is connected with the input end of the driving circuit and the input end of the PWM signal pulse width sampling and comparing circuit, The output end of the driving circuit is connected with the input end of the power switch circuit, the output end of the OCP comparing circuit is connected with the input end of the logic circuit, and the output end of the PWM signal pulse width sampling and comparing circuit is connected with the input end of the OCP comparing circuit. As that pulse width sampleand comparing circuit of the PWM signal is increase, the inductor current can be turned off in time when the system is disturbed by noise and the VCC voltage waveform is sharp, and the inductor current saturation phenomenon is avoided.
Owner:SHENZHEN WINSEMI MICROELECTRONICS
Electric leakage detection and switch control method and system based on Internet of Things
ActiveCN110048380ATimely shutdownAbsolutely safeEmergency protective arrangement detailsWater leakageThe Internet
The embodiment of the invention discloses an electric leakage detection and switch control method and system based on the Internet of Things, and the method comprises the steps that an Internet of Things cloud platform establishes communication with a water leakage and electric leakage detection device through a network control protocol, and receives a detection signal; the Internet of Things cloud platform establishes association information of the water leakage and electric leakage detection device and a power supply main switch and stores the association information in a local mapping table; the water leakage and electric leakage detection device sends alarm information to the Internet of Things cloud platform and gives an alarm for display; and the Internet of Things cloud platform searches a power supply main switch associated with the water leakage and electric leakage detection device and sends an instruction to close the power supply main switch. According to the invention, theInternet of Things cloud platform obtains the power line alarm condition collected by the water leakage and electric leakage detection device and controls the turn-off of the power supply main switch, so that the power line is timely turned off when the electric equipment is immersed in water, the absolute safety of the power line is ensured, and a maintenance department can be notified in real time to carry out maintenance through the Internet of Things cloud platform.
Owner:广州市技安电子科技有限公司
Charging detection circuit
PendingCN111162586ATimely shutdownCircuit monitoring/indicationDifferent batteries chargingCharge detectionEngineering
The embodiment of the invention discloses a charging detection circuit. The circuit can be used in cooperation with a battery and a charging circuit of the battery. The charging control circuit comprises: a switch control unit, a voltage detection unit, a control unit and a display unit, the input end of the voltage detection unit is connected with the battery; the output end of the voltage detection unit is connected with the control unit, the input end of the display unit and the control end of the switch detection unit are both connected with the control unit, one end of the switch detection unit is connected with the connecting end, and the other end of the switch detection unit is grounded. The voltage detection unit is used for sampling the voltage of the battery and outputting thevoltage to the control unit, and the control unit is used for controlling the display unit to display according to the voltage of the battery and / or controlling the switch control unit to be switchedon or switched off.
Owner:金鑫宇电源(深圳)有限责任公司
Controllable silicon multi-standby voltage switched control circuit
ActiveCN106229963AEasy to controlTimely shutdownEmergency protective circuit arrangementsControl signalLow voltage
The invention relates to a controllable silicon multi-standby voltage switched control circuit. The controllable silicon multi-standby voltage switched control circuit comprises a first controllable silicon control circuit module for external output, a second controllable silicon control circuit module for external output, a first control isolation relay, a second control isolation relay and an ICU detection circuit. Two controllable silicon control circuit modules are respectively connected with two control isolation relays, so that a control signal is provided; the ICU detection circuit is respectively connected with two control isolation relays, so that an alternative delay control signal is provided; and the output ends of the first controllable silicon control circuit module and the second controllable silicon control circuit module and the input ends of the first control isolation relay and the second control isolation relay are connected at the same joint. According to the controllable silicon multi-standby voltage switched control circuit disclosed by the invention, ordered working of a power supply is realized by utilizing the working relationship of voltage difference; isolation control is carried out by utilizing a signal type relay; and, whatever output conversion controllable silicon is switched from low voltage to high voltage or from high voltage to voltage, another controllable silicon cannot be in an instant conduction state.
Owner:GUANGDONG NRE TECH
A kind of over-current protection method for class-d power amplifier chip
ActiveCN102843106BAvoid burnsHigh potential pulse widthAmplifier protection circuit arrangementsEngineeringPwm signals
Owner:SHANGHAI BEILING
Rail transit wagon door surface pretreatment method
ActiveCN112589683AContinuous and stable shot blastingContinuous Stable ReinforcementPretreated surfacesAbrasive machine appurtenancesPretreatment methodDust control
The invention discloses a rail transit wagon door surface pretreatment method. The method comprises the following steps of first, workpiece conveying, wherein a workpiece conveying system conveys a to-be-treated workpiece into a shot blasting chamber, a paint spraying chamber, a drying chamber and a dust removal chamber in sequence; second, shot blasting cleaning, wherein a shot blasting device conducts shot blasting treatment on the workpiece entering the shot blasting chamber, shots obtained after treatment enter the two sides of a shot blasting chamber body and flow into a sand sliding hopper along the shot blasting chamber body, and the shots in the sand sliding hopper are conveyed to a top transverse screw through a bucket elevator, are cleaned by a cleaner and then enter the shot blasting device through a fan-shaped distribution valve; third, paint spraying, wherein an automatic spray gun in the paint spraying chamber sprays paint to the upper surface and the lower surface of theworkpiece subjected to shot blasting cleaning at the same time; and fourth, drying, wherein the drying chamber dries the painted workpiece. The method has the advantages that shot blasting rust removal treatment is conducted on the surface of a rail transit wagon door, and the mounting precision and the using effect of the rail transit wagon door are guaranteed.
Owner:WUHAN SHIJIHONG EQUIP MFG CO LTD
Clothes treatment equipment and window mat heating system and method thereof
ActiveCN110158262AAvoid odorGuaranteed operational safetyOther washing machinesWashing machine with receptaclesHeating systemMoisture sensor
The invention belongs to the technical field of clothes treatment equipment, in particular to clothes treatment equipment and a window mat heating system and method thereof. The window mat heating system comprises a main control board, a time relay and a heating device, wherein the main control board is used for sending a heating instruction to the time relay under the condition that the window mat needs to be heated; and the time relay is used for allowing the heating device to heat the window mat after receiving the heating instruction for a set period of time. The window mat heating systemrealizes the starting of the window mat heating through the connection of the main control board, the time relay, a socket, a plug and the heating device, and the stopping of the window mat heating through the connection with the main control board (a temperature sensor and a humidity sensor), and thus the purpose of drying the window mat more fully and uniformly on the premise of giving sufficient reaction time to users and ensuring the service life of equipment is realized.
Owner:QINGDAO HAIER WASHING ELECTRIC APPLIANCES CO LTD +1
STO control and drive circuit
PendingCN112910226AAchieving cut-off torque outputTimely shutdownEmergency protective circuit arrangementsPower conversion systemsElectric machineryExternal circuit
The invention discloses an STO control and drive circuit which comprises an external STO circuit input, an STO wave sealing logic signal filtering and shaping circuit, an STO logic signal amplifying circuit, an STO drive signal generating circuit and an STO failure backup circuit. According to the invention, the turn-off torque output is realized most directly and effectively, the circuit works independently and is not limited by an inherent complex control and drive circuit of an original system, and the motor torque can be turned off timely and effectively when the motor torque output needs to be turned off timely.
Owner:JIANGSU GTAKE ELECTRIC CO LTD
Surface pretreatment method of railway wagon door in rail transit
ActiveCN112589683BImprove processing efficiencyEnsure safetyPretreated surfacesAbrasive machine appurtenancesPretreatment methodDust control
The invention discloses a method for pretreatment of the door surface of rail transit railway wagons. It includes the following steps, step 1: workpiece conveying; the workpiece conveying system sends the workpiece to be processed into the shot blasting room, painting room, drying room and dust removal room in sequence; step 2: shot blasting cleaning; the shot blasting machine enters the shot blasting room The workpiece in the chamber is subjected to shot blasting treatment, and the processed shot material enters both sides of the shot blasting chamber body and flows into the sand hopper along the shot blasting chamber body; the shot material located in the sand hopper is transported to the top horizontal spiral by the bucket elevator, After being cleaned by the cleaner, it enters the shot blasting machine through the fan-shaped distribution valve; Step 3: Spraying paint; the automatic spray gun in the paint spraying room sprays paint on the upper and lower surfaces of the workpiece after shot blasting; Step 4: Drying; Drying The room is used to dry the painted workpieces. The invention has the advantages of performing shot blasting and derusting treatment on the surface of the railway freight car door in rail transit, thereby ensuring the installation accuracy and the use effect of the railway freight car door in rail transit.
Owner:WUHAN SHIJIHONG EQUIP MFG CO LTD
Shift register, drive device and displayer
ActiveCN102682692BTimely shutdownAvoid large transient currentsStatic indicating devicesElectric analogue storesShift registerControl signal
A shift register, a driving apparatus and a display. The shift register comprises: an evaluating unit for receiving a second clock signal and outputting an output signal to a signal output terminal under a control of an input signal; a reset controlling unit, a first terminal of which being connected to the evaluating unit and receiving the input signal, a second terminal of which receiving a first clock signal, a third terminal of which receiving a low level signal, for inputting a control signal to a reset unit under controls of the input signal and the first clock signal; the reset unit for receiving a high level signal and resetting the signal output terminal under a control of the control signal input by the reset controlling unit. When the shift register evaluates the output terminal, the gate of the reset transistor (4) is charged rapidly, which renders that the reset transistor (4) is turned off in time. Therefore, the great instantaneous current generated when the reset transistor (4) and the evaluating transistor (6) are turned on at the same time is avoided and circuit elements are protected while the power consumption is reduced. The shift register further utilizes an output signal feedback and a dual-gate technique of the input transistors so as to decrease an influence due to a leakage current from the input transistors, which may reduce the power consumption and enhance the stability.
Owner:BOE TECH GRP CO LTD
A control circuit for SCR multi-standby voltage switching
ActiveCN106229963BTimely shutdownEasy to controlEmergency protective circuit arrangementsSilicon-controlled rectifierLow voltage
Owner:GUANGDONG NRE TECH
Devices for dry gas sealing of compressors
ActiveCN111911413BReduce running timeExtended service lifeMeasurement of fluid loss/gain rateSealing arrangement for pumpsThermodynamicsDry gas seal
The invention provides a dry gas sealing device for a compressor. The device has a detection mechanism for detecting the pressure value of the gas inside the compression cylinder of the compressor; it receives a part of the gas inside the compression cylinder and pressurizes it, and increases the pressure. The pressurized gas is used to seal the leaking part of the compressor; the booster pump that supplies the leaking part with external sealing gas to seal the leaking part; the external sealing gas supply mechanism that can be manipulated to turn on and off the leaking part and the external sealing gas The first valve connected to the supply mechanism; the controller communicated with the detection mechanism, the controller receives the gas pressure value detected by the detection mechanism, and the controller communicates with the booster pump and the first valve to control the valve according to the signal of the detection mechanism The booster pump and / or the first valve are opened or closed.
Owner:西门子能源工业透平机械(葫芦岛)有限公司
Liquid rocket engine test run diaphragm box type end face sealing fault monitoring method
PendingCN114856865AEnsure safetyTimely shutdownRocket engine plantsComplex mathematical operationsMonitoring methodsThermodynamics
The invention relates to a liquid rocket engine test run diaphragm box type end face sealing fault monitoring method, which comprises the following steps of: firstly, setting a pressure measuring point and a temperature measuring point at a blow-off inlet of an isolation cavity of a liquid rocket engine, setting a pressure measuring point and a temperature measuring point at a fuel side discharge port, and setting a pressure measuring point and a temperature measuring point at an oxidant side discharge port; then monitoring parameter thresholds are set, parameters of all the measuring points are collected in real time, and when the parameters exceed the corresponding thresholds, it is judged that an end face sealing fault occurs. Meanwhile, the end face sealing leakage amount can be calculated.
Owner:XIAN AEROSPACE PROPULSION INST
Non-woven fabric winding device
InactiveCN105775868AGuaranteed uniformityAvoid hidden dangersWebs handlingWoven fabricCurrent collector
The invention discloses a non-woven fabric winding device. The non-woven fabric winding device comprises a rack, a current collector, a controller and a winding disc, wherein the winding disc is driven by a variable-speed motor, fabric guide arms are arranged on the front end of the rack, a portal frame is arranged on the front ends of the fabric guide arms, non-woven fabric passes through the middle of the portal frame and is guided to the rack by the fabric guide arms, and a vertical photoelectric switch is arranged on the top end of the portal frame; a transition arm is arranged between the fabric guide arms and the winding disc, a horizontal photoelectric switch which is used for emitting infrared light is arranged on one side of the part, between the transition arm and the winding disc, of the rack, another horizontal photoelectric switch which is used for receiving the infrared light is correspondingly arranged on the other side of the part, between the transition arm and the winding disc, of the rack, and the vertical photoelectric switch and the horizontal photoelectric switches are electrically connected with the current collector. When the non-woven fabric is broken or no non-woven fabric exists, the non-woven fabric falls down, the infrared light is instantaneously shielded, and the variable-speed motor is controlled to power off by the controller after a signal is received by the current collector, so that the winding disc of the non-woven fabric winding device stops winding, and hidden dangers to the product quality are avoided.
Owner:重庆九天无纺布有限公司
FPGA-based solar grid-connected inverter
InactiveCN109560569ATimely shutdownGuaranteed Phase ConsistencyEmergency protective circuit arrangementsSingle network parallel feeding arrangementsGrid connected inverterFull bridge
The invention discloses an FPGA-based solar grid-connected inverter. The FPGA-based solar grid-connected inverter comprises an FPGA, a phase tracking module, an input undervoltage output overcurrent protection module, a triangular wave, a voltage and current control loop, an SPWM generation module, a full bridge inverter, a PWM, an AD conversion control, an AD conversion chip and a DC-DC, the FPGAis installed on a data collection chip; the AD conversion chip transmits the electric supply after processing to the phase tracking module; the AD conversion chip transmits a filtering inductive current after processing to the voltage and current control loop; the AD conversion chip transmits an inverted output voltage after processing to the phase tracking module; the AD conversion chip transmits an DC-DC output voltage after processing to the PWM and outputs the DC-DC output voltage to the DC-DC; the phase tracking module transmits the information after processing to the voltage and currentcontrol loop; the voltage and current control loop feeds back the information to the SPWM generation module; and the SPWM generation module generates a triangular wave to achieve full-bridge inversion. The FPGA-based solar grid-connected inverter is good in conversion effect and high in device protection performance.
Owner:江苏天源太阳能发电有限公司
Converter fault processing method, readable storage medium and converter
The invention discloses a converter fault processing method, a readable storage medium and a converter. The converter comprises a converter main loop U1 and a controller U3; the method comprises the steps that: SP1, a U3 detects a U1 and determines whether the U1 has a fault or not; SP2, when a U2 determines that the U1 has no fault, the process returns to the SP1; when the U2 determines that the U1 has a fault, the next step is performed; SP3, the U3 determines the failed and non-failed phase cells of the U1; SP4, the U3 turns off the fully controlled switching device of the non-failed phase cell of the U1 to keep the fully controlled switching device of the failed phase cell of the U1. The converter fault processing method can reduce fault loss, can reduce fault occurrence range, can shorten maintenance time of the converter and can improve equipment availability.
Owner:SHENZHEN HOPEWIND ELECTRIC CO LTD
Silicon carbide MOSFET drive circuit
ActiveCN113054829AGuaranteed reliabilityAvoid failureEfficient power electronics conversionEmergency protective circuit arrangementsMOSFETCapacitance
The invention discloses a silicon carbide MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) driving circuit which comprises an anti-bridge-arm crosstalk circuit, the anti-bridge-arm crosstalk circuit comprises a driving chip U1, a capacitor C5 and a switching tube T1, and an output end of the driving chip U1 is connected with one end of the capacitor C5 and is connected with a grid electrode of a silicon carbide MOSFET; the other end of the capacitor C5 is connected with a collector electrode of the switch tube T1, an emitter electrode of the switch tube T1 is connected with a source electrode of the silicon carbide MOSFET and is connected with a grounding end GND3, and a base electrode of the switch tube T1 is connected with a grid electrode of the silicon carbide MOSFET. The silicon carbide MOSFET driving circuit has the advantages of simple structure, bridge arm crosstalk prevention, common mode interference suppression, short circuit protection, overvoltage protection and the like.
Owner:湖南国芯半导体科技有限公司
Synchronous rectification control method of flyback converter and its control module
ActiveCN104539163BTimely shutdownNo conduction phenomenonEfficient power electronics conversionAc-dc conversionTransformerBuck converter
Owner:MORNSUN GUANGZHOU SCI & TECH
Anti-collision laser cutting device with follow-up protection structure
InactiveCN114505599APlay a role of buffer protectionEffective protectionLaser beam welding apparatusEngineeringLaser cutting
The anti-collision laser cutting device with the follow-up protection structure comprises a cutting workbench and a laser cutting head, the laser cutting head is installed on the inner side of a lifting installation frame, and a supporting spring is fixedly welded between the lifting installation frame and the lower end of a movable sleeve frame. The laser cutting head forms a sliding lifting structure on the inner side of the movable sleeve frame, side movable frames are hinged to the left side and the right side of the movable sleeve frame, side poke rods are arranged at the attaching positions of the side movable frames and the laser cutting head, and deflection structures of the side movable frames form a synchronous adjusting structure for a lifting structure of the laser cutting head through the side poke rods. According to the laser cutting head, a side edge protection structure is formed for the laser cutting head through the side edge installation structure of the side movable frame, meanwhile, a linkage adjustment installation structure is formed between the side poke rod of the side movable frame and the laser cutting head, flexible disassembly and assembly of the laser cutting head are facilitated, and meanwhile hard collision of a laser cutting head body is effectively avoided.
Owner:XUZHOU HAITAO REFRIGERATION EQUIP
A method for detecting leakage of trunk gas pipelines using the pressure drop rate at the shut-off valve
ActiveCN114110439BAccurate and fast shutdownTimely shutdownPipeline systemsThermodynamicsVoltage drop
The present application discloses a method for detecting the leakage of a trunk gas pipeline by using the pressure drop rate at a cut-off valve, which includes acquiring pressure data at the position of the cut-off valve at preset time intervals; when the pressure data is within a preset pressure range and decreases monotonically with time , calculate the current value of the voltage drop rate; compare the current value of the voltage drop rate with each voltage drop rate threshold in the predetermined sequence of voltage drop rate thresholds; compare the counter corresponding to the voltage drop rate threshold smaller than the current value of the voltage drop rate Add the preset time interval, and clear the counter corresponding to the pressure drop rate threshold greater than the current value of the pressure drop rate, and cycle in turn; when the counter corresponding to any pressure drop rate threshold reaches the alarm time threshold, the shut-off valve is controlled to close . The above method can make the shut-off valve more accurately and quickly respond to the leakage accident of the main gas transmission pipeline and shut it off in time, reduce economic losses and environmental safety impacts, and is suitable for judging more types of leakage situations.
Owner:CHINA UNIV OF PETROLEUM (BEIJING) +1
Electrical equipment detection equipment based on infrared detection
InactiveCN112258451AEasy to detectTimely shutdownImage enhancementTelevision system detailsGear wheelElectric machinery
The invention discloses electrical equipment detection equipment based on infrared detection, and the equipment comprises a supporting pedestal, the lower side of the supporting pedestal is fixedly connected with a low-speed motor, the main shaft end of the low-speed motor is horizontally and fixedly connected with a rotating disc, and the upper side of the edge of the rotating disc is rotatably connected with supporting plates. A top plate is horizontally and fixedly connected to the position over the rotating disc, a storage battery pack is fixedly installed in the middle of the upper end face of the top plate, an infrared detection mechanism is arranged at the position where each supporting plate is located, and a power connection mechanism is connected to the top plate. The low-speed motor is started to drive the rotating disc to rotate, electrical equipment rotates and translates along with the rotating disc, and in the process. A linkage gear rolls along an inner gear ring and the supporting plates are rotatably connected to the position of a mounting opening, so that the supporting plates drive the electrical equipment to rotate; therefore, the infrared thermal imaging cameras distributed at the upper, lower, left and right positions are convenient to detect the electrical equipment in an all-round manner.
Owner:深圳市环测威检测技术有限公司
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