102results about How to "With short circuit protection" patented technology

The invention relates to a radiation-proof self-recovery over-current/short-circuit protection circuit for a satellite. On the basis of a line structure, the self-recovery over-current/short-circuit protection function is realized. Moreover, the circuit has advantages of reasonable design, small size, and light weight. The radiation-proof self-restoring over-current/short-circuit protection circuit is composed of a power supply module, a triode driver module, a VDMOS tube module including a VDMOS tube Q2, a current detection, amplifier and comparator module, a trigger feedback module having a D trigger U3, and a precision sampling resistor RS1 connected in series to a bus. The power supply module is used for providing power for the current detection, amplifier and comparator module and the trigger feedback module through buses. The input terminal of the triode driver module is connected with an input signal of the control circuit and the output terminal is connected with a gate terminal of the VDMOS tube Q2; and a source end of the VDMOS tube Q2 is connected with the bus by the precision sampling resistor RS1 and a drain end is grounded by a resistor R13. The current detection, amplifier and comparator module consists of a current detection chip U1 for current detection and signal amplification and a comparator U2.

The invention discloses a cycle-by-cycle current-limiting protection method for a VIENNA rectifier and a device thereof. The method comprises the following steps: when three-phase input current of a main power circuit exceeds overcurrent protection threshold current and reaches certain time in a switching cycle, stopping driving a switching tube of the main power circuit; and when the three-phase input current of the main power circuit returns to and below the overcurrent protection threshold current and a driving control signal of the switching tube reaches a stable status in the switching cycle, re-driving the switching tube of the main power circuit. In the invention, the driving signal of the switching tube is adjusted by the three-phase input current in a pulse cycle to effectively protect the switching tube in the main power circuit against overcurrent damage and achieve the effect of continuous change of the input current. In the case of short circuit in the main power circuit owing to faults, the invention can make response in the switching cycle and ensure that single pulse short-circuit current is kept within the allowable range, thus having a short-circuit protection function and improving reliability of a switching power supply and a power device.

The invention consists of CAN-LIN gateway, CAN control module and LIN control module. The CAN-LIN gateway uses CAN bus and LIN bus protocol, and connects to CAN control module through CAM bus interface, and connects to peripherals through peripherals interface to implement signals collection and electronic component control in vehicle. The LIN control module connects to CAN-LIN gateway through LIN bus interface, and connects to peripherals through peripherals interface to implement signals collection and electronic component control in vehicle. The LIN bus protocol is saved in CAN-IN gateway and LIN control module, and the CAN bus protocol is saved in CAN-LIN gateway and CAN control module.

The present invention discloses a DeviceNet fieldbus I/O device with short-circuit protection and self-diagnostic function, which comprises the following components: a DeviceNet interface unit which is used for executing data communication between the DeviceNet fieldbus, setting the bus node number and the communication baud rate of this node, and collecting and storing the input interface state and output interface state diagnosis data; an input/output short-circuit protecting and self-diagnosis unit which is used for executing data communication between the peripheral equipment, switching off the power for short-circuit protection and transmitting the input interface state and/or output interface state diagnosis data to the DeviceNet interface unit when the input/output interface circuit and/or the output interface circuit is shorted. The DeviceNet I/O device of the invention has the functions of short-circuit protection and self diagnosis, can switch off the power and provide self-diagnosis information when the interface power is shorted and automatically recover the operation when the short-circuit trouble is eliminated.

The invention discloses a lithium battery pack battery management system for a solar panel. The lithium battery pack battery management system comprises a lithium battery pack, a master control module, a power supply management module and an external expansion communication module and is characterized in that the power supply management module is in communication connection with the master controlmodule, the external expansion communication module is in communication connection with the master control module, the signal input end of the master control module is electrically connected with thesignal output ends of a temperature detecting module, a voltage detecting module and a current detecting module, and the signal output end of the master control module is electrically connected withthe signal input ends of a multichannel battery equalization control module, a charging and discharging detection enabling control module and an indicator lamp module. The lithium battery pack batterymanagement system has the advantages that the system is extremely low in stand-by power consumption, and the problem that the lithium batteries, which are fully charged when leaving a factory, of a lithium battery pack is over-discharged and damaged after self-discharge, and the lithium batteries cannot be charged through the solar panel is solved.

The invention relates to the stainless steel inner pipe electrolytic polishing treatment, an automatic operation is employed, the processing parameter is automatically adjusted, thereby the processing quality stabilization can be guaranteed. An electrolytic polishing solution is introduced in the stainless steel pipe, on one hand, the bubbles generated in the electrolytic polishing treatment process can be timely discharged, and on the other hand, the residues generated during the electrolytic polishing treatment can be timely discharged. In addition, during the process of stainless steel inner tube electrolytic polishing, the stainless steel pipe is capable of rolling, the bubbles can be prevented from rising to top of the pipe to influence the electrolytic polishing effect on the top of the inner pipe. The rolling speed is adjustable, the electrolytic polishing solution is environment-friendly type liquid medicine, the current passed through the unit area is small, compared with a traditional electrolytic polishing solution, the power consumption is smaller, and the energy saving performance is provided. The electrolytic polishing device is a stainless steel pipe inner electrolytic polishing special machine, and can be used for electrolytically polishing the stainless steel pipes with various calibers. The device of the invention has the advantages of high automation degree, environmental protection, energy saving, high production efficiency and good polishing effect.

The invention discloses an optical fiber trigger type high-voltage solid-state switch. The optical fiber trigger type high-voltage solid-state switch comprises a high-voltage direct-current power source, an FPGA control system, an optical fiber driving signal transmission part, an optical fiber fault signal transmission part, an IGBT series circuit, a plurality of IGBT driving modules and a plurality of IGBT voltage-sharing circuits; the optical fiber driving signal transmission part comprises a first optical fiber transmission module and a first optical fiber receiving module, the optical fiber fault signal transmission part comprises a second optical fiber transmission module and a second optical fiber receiving module, a plurality of series IGBT switches are arranged in the IGBT series circuit, and the number of the IGBT driving modules is the same as the number of the IGBT switches; the positive pole of the high-voltage direct-current power source is connected with the collector of the first IGBT switch in the IGBT series circuit through a load, and the negative pole of the high-voltage direct-current power source is connected with the emitter of the final IGBT switch in the IGBT series circuit. The optical fiber trigger type high-voltage solid-state switch is high in integration level, small in circuit board size and low in cost, effective electric isolation is provided, and the optical fiber trigger type high-voltage solid-state switch has the overcurrent and short circuit protection function and is flexible and convenient to use.

The invention discloses a CANopen field bus input/output device with a short-circuit protection and self-diagnosis function, which comprises a CANopen interface unit and an input/output short-circuit protection and self-diagnosis unit, wherein the CANopen interface unit is used for carrying out data communication with a CANopen field bus, carrying out field data communication with the input/output short-circuit protection and self-diagnosis unit and acquiring input interface state diagnosis data and output interface state diagnosis data; and the input/output short-circuit protection and self-diagnosis unit is used for carrying out the data communication with peripheral equipment, and cutting off power to provide short-circuit protection and transmitting the input interface state diagnosis data and/or the output interface state diagnosis data to the CANopen interface unit when an input interface circuit and/or an output interface circuit are/is short-circuited. The CANopen I/O device of the invention has the short-circuit protection and self-diagnosis function, and can cut off the power and provide self-diagnosis information when the interface power is short-circuited and then return to work automatically after the short-circuit fault is removed.

The invention relates to a 3D printing nozzle with the function of fully melting raw materials, including a feeding mechanism, a heating mechanism and a discharging mechanism. The heating mechanism includes a main body, a stirring assembly arranged on the main body, and several first heaters. It has a mixing chamber, a feeding pipe, a discharging pipe and an overflow prevention pipe. The stirring assembly includes a heat shield, a first motor and a screw. The feeding mechanism includes a feeding plate and a first conveying assembly set on the feeding plate, a cutting component, and the second conveying component, in the 3D printing nozzle with the function of fully melting the raw material, the feeding mechanism uses two sets of gears to assist feeding, and a blade for cutting the raw material wire is installed between the two sets of gears, which can prevent heat transfer. The heating mechanism can fully melt the incoming raw materials and store them in the storage room of the feeding and discharging mechanism. The nozzle converts the existing real-time feeding into intermittent feeding, preventing the printing from being flawed due to unmelted materials, and preventing Nozzle is blocked.

The invention relates to a gas generating device, in particular to a vertical carbon-dioxide generator for a greenhouse with the purpose of solving the technical difficulty that carbon dioxide generators in the same kind are high in energy loss. The vertical carbon-dioxide generator comprises a thermal decomposition reactor and an ammonia absorber. The top end of the thermal decomposition reactor is provided with a feeding sealing cover. The bottom of the thermal decomposition reactor is provided with a heater. The side wall of the thermal decomposition reactor is provided with a waste discharge valve and a mixed gas pipe. The mixed gas pipe and the ammonia absorber are communicated. The side wall of the ammonia absorber is provided with a liquid level pipe, a water-adding valve, an ammonia water discharge valve and a carbon-dioxide exhaust pipe. The interior of the ammonia absorber is provided with a millipore filter communicated with the mixed gas pipe.The vertical carbon-dioxide generator for the greenhouse has following beneficial effects: by heating ammonium bicarbonate, carbon dioxide is produced and gas is produced at high speed; by means of a pressure adjusting system, uniform gas distribution at long distance can be achieved; the problem that a technical product in the same kind may have energy dissipation due to the need of air pump pressurization is solved; the vertical carbon-dioxide generator is adapted for greenhouses with all specifications; and carbon dioxide can be supplemented to multiple greenhouses in a unified way at the same time.

The invention aims at providing a high voltage direct current control switch which is arranged at an output end of a high voltage direct current power supply and comprises an MOSFET (Metal-Oxide -Semiconductor Field Effect Transistor) electronic switch power circuit, and a control circuit for controlling opening and closing of the MOSFET electronic switch power circuit, wherein the control circuit comprises a current sampling circuit for sampling output current of the high voltage direct current power supply, a switch control circuit generating control signals to control the opening and closing of the MOSFET electronic switch power circuit, and a singlechip. The high voltage direct current control switch comprises the MOSFET electronic switch circuit and the MCU (Micro Controller Unit) intelligent control circuit; the MOSFET electronic switch circuits can be in parallel connection to form a multiway switch; and the whole scheme can realize an intelligent electronic switch which achieves multiple parallel switches, spark-free switch motion and mutual delay among the switches, and has functions of short-circuit protection, self recovery after removal of a short-circuit fault, and the like.

The invention relates to the technical field of control boxes, in particular to a mining explosion-proof intrinsic safety type control box for a valve electric device, which comprises a power module and a transformer. The mining explosion-proof intrinsic safety type control box for the valve electric device is characterized in that: the transformer is connected with an isolating conversion switchand an electric leakage protection module; the isolating conversion switch is connected with a fuse; the fuse is connected with a motor breaker; the motor breaker is connected with an alternating current contactor; the alternating current contactor is connected with an explosion-proof motor; the electric leakage protection module is connected with an intrinsic safety isolating module, a potentiometer and a control module; the intrinsic safety isolating module and the potentiometer are connected with the control module; the intrinsic safety isolating module is connected with a knob switch; theknob switch is connected with the power module and the control module; the control module is connected with a travel switch and a liquid crystal display; the travel switch is connected with a torque switch; and the torque switch is connected with the control module. The mining explosion-proof intrinsic safety type control box for the valve electric device can be applied to an automatic system more widely and more reliably.

The invention provides a programmable battery charger. A phase shift trigger module of the programmable battery charger converts input 220V alternating-current voltage into alternating voltage and provides the alternating voltage to a high-power voltage transformation module, the high-power voltage transformation module converts the alternating voltage output by the phase shift trigger module into alternating-current voltage which can be used for charging a storage battery, a rectifier filter rectifies and filters the alternating-current voltage output by the high-power voltage transformation module to obtain direct-current voltage which can be used for charging the storage battery, and a chopper switch transmits the direct-current voltage output by the rectifier filter to the storage battery for charging under the control of a controller. The programmable battery charger has the characteristics of small size, high conversion efficiency, great design capacity, high reliability, long service life and the like, has the functions of short-circuit protection, reverse connection protection, low-voltage protection and the like, and can realize the charging, the discharging, the repair and the maintenance of the storage battery.

The invention relates to a multi-path-output low-voltage-difference over-current protector comprising an input interface, an auxiliary power supply, a fault resetting and reporting circuit, a fault reporting interface, a differential current sampling circuit, an electronic switch, an error amplifier, a differential voltage comparator, and an output interface and the like. According to the invention, a P channel power MOS tube is used as an electronic switch; a low-voltage-difference shunt is used for carrying out sampling of a small current signal and then a differential amplifier is used foramplifying the small current signal; and the amplified signal and a current reference are sent to the error amplifier to carry out error amplification to control the opening degree of the power MOS tube. A constant-current state is realized under the condition of being larger than a rated current reference; and complete opening is carried out under the condition of being lower than the rated current reference. The differential voltage comparator is used for comparison between the voltage difference of the power MOS tube and the voltage reference to determine whether a fault exits.

The invention relates to a super lightning protection mobile socket which comprises a shell body, a circuit board, an overcurrent sensor, a zero sequence mutual inductor, a test button, a reset button, a control circuit, an electromagnetic tripping device, two static contact pieces and two moving contact pieces on the N pole and the L pole; the electromagnetic tripping device consists of a framework, a main trip coil, a short circuit trip coil, an iron core and a spring; one end of each of the two moving contact pieces is arranged on the circuit board; an insulated pothook is arranged on two moving contact pieces; the other end of each of the two moving contact pieces is provided with a moving contact; an offsetting spring is sleeved on the reset button; the bottom of the reset button is provided with a reset pothook configured corresponding to the insulated pothook; the reset pothook is connected with the iron core; one end of each of the two static contact pieces is provided with a static contact; the other end of each of the two static contact pieces is arranged on the circuit board; the N pole runs through the zero sequence mutual inductor, bends outwards and traverses the overcurrent sensor; simultaneously, the L pole runs through the zero sequence transformer and the overcurrent sensor; a winding of the zero sequence mutual inductor is accessed to the control circuit. The invention has rapid speed of cutting off the power supply, is immediately grounded for protection and has high sensitivity and good reliability.

The invention discloses a plug contact state detecting device for automatic charging equipment. The plug contact state detecting device comprises a charging pile end MCU, a relay I, a power source I,a power source II, a proximity switch, a voltage detecting circuit I, and a charging pile end electrode. A robot end assembly includes a robot end MCU, a relay II, a battery, a current detecting circuit, a voltage detecting circuit II, and a robot end electrode. The charging pile end MCU is electrically connected with the proximity switch, the voltage detecting circuit I and the coil of the relayI. The power source I is electrically connected with the normally closed contact of and relay I. The power supply II is electrically connected with the normally open contact of relay I. A charging pile end positive electrode is electrically connected with the moving contact of the relay I and the voltage detecting circuit. The robot end MCU is connected with the current detecting circuit, the voltage detecting circuit II and the coil of the relay II. The voltage detecting circuit II is electrically connected to the normally closed contact of the relay II. The plug contact state detecting device uses a charging electrode as a communication medium to reliably determine sufficient contact of the charging electrode.

The invention relates to a gas generation device, in particular to a greenhouse carbon dioxide generator, and solves the technical problem that energy consumption of a similar existing carbon dioxide generator is large. The carbon dioxide generator comprises a thermolysis reactor and an ammonia absorber, a charging sealing cover is arranged at the top end of the thermolysis reactor, a heater is arranged at the bottom of the thermolysis reactor, an overflow port valve and an exhaust valve are arranged on the side wall of the thermolysis reactor, and the thermolysis reactor is communicated with the ammonia absorber through a mixed gas pipe and a communication pipe; a microporus filter is arranged in the ammonia absorber, a water filling sealing cover is arranged at the top end of the ammonia absorber, and a carbon dioxide exhaust port, a liquid level tube and a ammonia exhaust valve are arranged on the side wall of the ammonia absorber. According to the greenhouse carbon dioxide generator, ammonium bicarbonate is heated to produce carbon dioxide, the gas production speed is high, gas can be distributed uniformly at a remote distance by the aid of a pressure regulating system, the energy consumption problem that a similar existing technical product requires an air pump for pressurizing is solved, the greenhouse carbon dioxide generator is applicable to various specifications of greenhouses, and carbon dioxide can be supplemented in a plurality of greenhouses uniformly.

The invention discloses an automatic closing device of a circuit breaker. An automatic closing mechanism comprises a heat-sensitive element and a reset spring; after the heat-sensitive element is electrified, the automatic closing mechanism is enabled to push a handle of the circuit breaker to perform closing operation; after the heat-sensitive element is diselectrified, the reset spring enables the automatic closing mechanism to be reset. An auxiliary contact set is connected in series in a circuit used for supplying power to the heat-sensitive element. A rotary plate transmission mechanism is rotationally mounted on a base of the circuit breaker; when being in a first position, the rotary plate transmission mechanism does not interact with the auxiliary contact set; when being in a second position, the rotary plate transmission mechanism drives the auxiliary contact set to be switched off; the rotary plate transmission mechanism rotates to the second position from the first position in response to a trigger signal. A switching shift rod performs switching between an automatic position and a manual position; when being switched to the automatic position, the switching shift rod does not interact with the rotary plate transmission mechanism; when the switching shift rod is switched to the manual position, the trigger signal is generated. The trigger signal is further generated by the closing operation of the handle.

The invention discloses a mobile phone and electric vehicle dual-purpose networking intelligent charging integrated machine which is an integrated wall-mounted intelligent charger and comprises a charger shell, a wall-mounted mounting assembly, a user identification system, a mobile Internet access system, a man machine operation system, an intelligent payment settlement system, a coin payment system, a charging capacity display system, a network communication system, an automatic charging system, an intelligent processing system, and connecting lines. The intelligent processing system comprises an information processing system, an intelligent motherboard, a wireless router, and a wireless network card, and the systems are connected through the connection lines. The mobile phone and electric vehicle dual-purpose networking intelligent charging integrated machine conforms to the development needs of the mobile Internet, Internet+, and smart cities and is connected to the mobile Internet, a new 'smart' way of life is formed, a mobile phone charger and an electric vehicle charger are integrated into one body, and the networking intelligent charging of a mobile phone and an electric vehicle is realized.

The invention discloses positive and negative power sources with short circuit protection function, which comprise a transformer, a rectifying circuit, an assistant power voltage stabilizing circuit, an output power voltage stabilizing circuit, an operation amplifier U1, an operation amplifier U2, a PNP switch audion T1 and a NPN switch audion T2; the assistant power voltage stabilizing circuit is composed of PV3 and PV4; the output power voltage stabilizing circuit is composed of PV1 and PV2; the output ends of the PV3 and P4 are formed to be positive and negative poles of the assistant power source; collectors of T1 and T2 are formed to be positive and negative poles of output power source. When the positive or negative output is in earthing short circuit state, the positive and negative power sources with the short circuit protection function can cut off the output of power source and keep a low level state; when the short circuit fault disappears, the positive and negative power sources can recover the normal power supply, realize the effective protection of element appliances, and prolong the service life of the power source; the beneficial effects are significant; the positive and negative power sources are applicable to apply and popularize.

The invention discloses a high-sensitivity and multi-functional control system for a multi-circuit light emitting diode (LED) lamp. The high-sensitivity and multi-functional control system is characterized by mainly comprising a singlechip, a power supply, an infrared detector, a brightness sensor, a displayer, a data storage device, an LED lamp, a signal amplifier, a brightness signal processing circuit, a constant-current driving circuit and a triode rectification and filtering voltage-stabilization circuit, wherein the infrared detector, the brightness sensor, the displayer, the data storage device and the LED lamp all are connected with the singlechip, the signal amplifier is connected in series between the infrared detector and the singlechip, the brightness signal processing circuit is connected in series between the brightness sensor and the singlechip, the constant-current driving circuit is connected in series between the singlechip and the LED lamp, and the triode rectification and filtering voltage-stabilization circuit is connected in series between the power supply and the singlechip. With the multi-functional control system for the LED lamp, disclosed by the invention, the stable driving current can be output, automatic control on turn-on or turn-off of the LED lamp can be achieved, thus, the energy-saving aspect of the LED lamp can be satisfied, and the requirement of intelligent control is met.

This invention discloses an Ether net signal processor and method. The processor is set in the Ether net node including a network transformer, a programmable logic device and a crystal oscillator providing sampling frequency to the device, among which, the network transformer connected to the programmable logic device is for realizing signal isolation and network terminal, the programmable logic device is for processing Ether net signals including decoding and encoding Ether net signals and controlling the cc and storage of Ether net signals, which develops the application of programmable logic devices in the process field of Ether net transmission signal physical layer.

The invention discloses a high-power insulated gate bipolar translator (IGBT) drive circuit, which comprises a seventh integrated triode array and other components, wherein a ninth triode is connected with a thirty-first resistor; the thirty-first resistor is connected with the seventh integrated triode array, an eighth integrated triode array and a fourteenth diode; a twenty-eighth resistor is connected with the fourteenth diode; the seventh integrated triode array is connected with an eleventh triode; the eighth integrated triode array is connected with a twelfth triode; the twenty-eighth resistor is connected with a tenth triode and a twenty-third resistor; the twenty-third resistor is connected with a twenty-second resistor and an eighth capacitor; a twenty-fourth resistor is connected between the seventh integrated triode array and the eleventh triode; a twenty-sixth resistor is connected between the eighth integrated triode array and the twelfth triode; and the tenth triode is connected with a tenth capacitor, an eleventh capacitor and a fourth voltage-regulator tube. The high-power IGBT drive circuit implements fiber-optic isolation, and has high switching frequency and strong driving capability.