57results about How to "Fast protection" patented technology

The invention discloses a traction power supply device based on the PWM rectifier. The device comprises a transformer, a rectifier, a control panel, a host computer and a switching power supply. The invention is characterized in that: the rectifier is a PWM rectifier, the switching power supply employs an intelligent power module with high integration degree, the control panel utilizes CPLD for failure predication and pulse blocking protection and sends six paths of PWM pulses via optical fiber interfaces to actuate power switching tubes inside the PWM rectifier, the host computer is connected with the control panel via Ethernet network and serves for the state monitoring and fault diagnosis of the rectifier, the rectifier is conducted under the current decoupling control based on the synchronously-rotating dq coordinate system, utilizes the phase-locked loop to obtain power voltage synchronizing angles and then performs PI regulation of the d-axis current and the q-axis current respectively, and generates six paths of PWM pulses by means of space vector pulse-width modulation.

The invention provides a plug, comprising a shell body (1), terminals (2, 3, 4) extending into the shell body, and electric output wires (5, 6, 7). The invention has the characteristics that the shell body is also provided with a temperature and electric current protector (100), wherein the temperature and electric current protector (100) comprises a bimetallic strip (40) and a thermal resistor (50) which is arranged in parallel at the two ends of the bimetallic strip (40); the temperature and electric current protector is arranged in series between the live wire terminal and the live wire of the electric output wire. The invention is capable of preventing the automatic resetting of the bimetallic strip after breaking off to shut off the circuit, which enhances the safety of the use, as the electric supply of the plug needs to be cut off and the power supply needs to be connected to reset the power source after the temperature falls. Therefore, the safety is enhanced; and the plug is more sensitive to the protection of overcurrent.

The invention provides an SIC (Silicon Carbide) MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) over-current short-circuit detection circuit and detection protection system. The SIC MOSFET over-current short-circuit detection circuit comprises a first resistor, a second resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a 29th resistor, a 30th resistor, a third capacitor, a first diode, a second diode, a fourth diode, a fifth diode, a second triode and a switch current extending device. For the SIC MOSFET over-current short-circuit detection circuit, the switch current extending device is used, and the switching speed of the switch current extending device is higher than the switching speed of a SiC MOSFET; when the SiC MOSFET is completely turned on, the switch current extending device can be quickly turned on so that the detection circuit can quickly give a response and quickly enter into the detection stage and quickly detect whether over-current short circuit occurs in the SiC MOSFET. Therefore, the detection speed is improved so that the speed for the over-current short-circuit protection circuit to protect the SiC MOSFET is improved.

The invention discloses a test power source for a large-power microwave device. The power source is used for outputting a stable direct-current high voltage which is needed in testing of the microwave device. A circuit includes a boosted circuit, a high-frequency rectifying circuit, a high-voltage sampling circuit, a high-frequency inversion circuit and a high-frequency control circuit, which are connected in order. The high-voltage sampling circuit is used for sampling output voltages of the power source and outputting a high-voltage sampling voltage to the high-frequency control circuit. The high-frequency inversion circuit is used for generating high-frequency alternating-current signals which are then transmitted to the boosted circuit. The high-frequency control circuit is used for receiving the high-voltage sampling voltage and generating a control signal to regulate the high-frequency inversion circuit according to the high-voltage sampling voltage so that outputs of the power source are stabilized to a preset value. The test power source for the large-power microwave device enables the stable direct-current voltage to be provided and is relative high in efficiency.

The present invention is gaseous corrosion retardant for industrial apparatus and its preparation process. The supplied supermolecular structure gaseous corrosion retardant is intermolecular Al-Si compound-alkylamine-volatile amine associated complex in tunnel-shaped pore structure of different inner diameters. Two or more compounds are associated through intermolecular structure complementation and molecular distinction to reach the aims of regulating volatilizing property and protection radius. The preparation process of the gaseous corrosion retardant includes the first preparing Al-Si compound in tunnel-shaped pore structure and the subsequent gaseous or liquid phase association of alkylamine and volatile amine and the Al-Si compound to obtain the supermolecular structure gaseous corrosion retardant.

The invention discloses a shortcut protection method based on a path-bound MPLS-TP (Multi-Protocol Label Switching-Transmission Protocol), comprising the following steps of: configuring a ring network protection link: configuring a protection path for loopback protection and a Steering-protected path for an LSP (Logical Signal Processor) of an upper ring by a ring network node; and when the ring network generates faults, carrying out the processing steps of: (1) processing adjacent nodes of a fault link; and (2) processing adjacent nodes of a non-fault link. The invention can find the protocol support without topology and simultaneously improve the Steering protection speed, which has great significance on improving the performance of the ring network based on the MPLS-TP technology.

The invention discloses an overvoltage and overcurrent protection element. The element is a resistance random storage unit having a two-end structure, when the voltages at the two ends of the element are beyond certain values, the resistance value is rapidly converted into a low resistance value from a high resistance value or is rapidly converted into the high resistance value to the low resistance value, by utilizing the characteristic that the resistance value is rapidly converted into the low resistance value from the high resistance value when the voltages at the two ends of the element are beyond certain values, the element and a load are correlated to achieve overvoltage protection of the load, and by the characteristic that the resistance value is rapidly converted into the high resistance value from the low resistance value when the voltages at the two ends of the element are beyond certain values, the element and a load are connected in series to achieve overcurrent protection of the load. Since the resistance conversion speed of a RRAM (Resistance Random Access Memory) device can reach nanosecond (ns), even picoseconds (ps), the conversion voltage can be controlled by a process, and the overvoltage and overcurrent protection element has the characteristics of a simple structure, fast protection speed, high resistance value, reversibility and the like, and is a very ideal overvoltage and overcurrent protection element.

The invention relates to an overcurrent and overvoltage protector with a bimetallic strip temperature switch. The protector comprises a PTC (positive temperature coefficient) thermistor chip (1), a piezoresistor chip (2) and the bimetallic strip temperature switch (3), wherein one side electrode of the PTC thermistor chip (1) is connected with one side electrode of the piezoresistor chip (2) through soldering tin to form a common terminal which is led out by a first lead foot (6); a metal shell of the bimetallic strip temperature switch (3) is connected with the other side electrode of the PTC thermistor chip (1) through the soldering tin; a first leading-out terminal (4) of the bimetallic strip temperature switch (3) is connected with the other side electrode of the PTC thermistor chip (1); a second leading-out terminal of the bimetallic strip temperature switch (3) is led out by a second lead foot (5); and the other side electrode of the piezoresistor chip (2) is led out by a third lead foot (7). According to the overcurrent and overvoltage protector with the bimetallic strip temperature switch, a post-stage circuit is protected, and the functions of automatic power off and automatic power on are realized.

The present invention is gaseous corrosion retardant for industrial apparatus and its preparation process. The supplied supermolecular structure gaseous corrosion retardant is intermolecular Al-Si compound-alkylamine-volatile amine associated complex in tunnel-shaped pore structure of different inner diameters. Two or more compounds are associated through intermolecular structure complementation and molecular distinction to reach the aims of regulating volatilizing property and protection radius. The preparation process of the gaseous corrosion retardant includes the first preparing Al-Si compound in tunnel-shaped pore structure and the subsequent gaseous or liquid phase association of alkylamine and volatile amine and the Al-Si compound to obtain the supermolecular structure gaseous corrosion retardant.

The invention discloses a space solid state power distribution protection circuit, method and a power supply and distribution system. An auxiliary power supply module outputs a first voltage to an on / off control module and outputs a second voltage to an overcurrent / short circuit protection module, and the on / off control module controls on and off of the space solid state power distribution protection circuit through a command mode; a driving module amplifies on and off signals of the command mode and drives on and off of a switch module; and a current sampling module acquires a bus voltage ofa bus power supply and performs real-time monitoring, and when the bus voltage is greater than a first preset threshold voltage, the overcurrent / short circuit protection module quickly cuts off the switch of the switch module. The advantages of fast action response and high reliability are achieved.

The invention provides an SIC (Silicon Carbide) MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) over-current short-circuit detection circuit and detection protection system. The SIC MOSFET over-current short-circuit detection circuit comprises a first resistor, a second resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a 29th resistor, a 30th resistor, a third capacitor, a first diode, a second diode, a fourth diode, a fifth diode, a second triode and a switch current extending device. For the SIC MOSFET over-current short-circuit detection circuit, the switch current extending device is used, and the switching speed of the switch current extending device is higher than the switching speed of a SiC MOSFET; when the SiC MOSFET is completely turned on, the switch current extending device can be quickly turned on so that the detection circuit can quickly give a response and quickly enter into the detection stage and quickly detect whether over-current short circuit occurs in the SiC MOSFET. Therefore, the detection speed is improved so that the speed for the over-current short-circuit protection circuit to protect the SiC MOSFET is improved.

The invention relates to an output short-circuit protection circuit for a high tension battery. The output short-circuit protection circuit structurally comprises a detection control circuit, a switch circuit, a choke circuit, a load capacity match circuit and a switch buffer circuit. According to the output short-circuit protection circuit, the voltage of the load capacity match circuit or the choke circuit is detected by the detection control circuit, after the output short circuit is confirmed, the switch circuit is controlled to be switched off rapidly; after the switch buffer circuit is arranged, the switch circuit realizes the zero-voltage switching on and off, so that the energy impact and the voltage impact to the switch circuit can be reduced; and therefore, the switch circuit can be safely switched on and off. The short-circuit current is limited by the choke circuit, so that the energy impact to the battery and the switch circuit can be reduced. After the short-circuit fault is eliminated, the switch is controlled to be switched on by detecting the voltage condition of the detection control circuit, so that the battery can be reset to normally supply power.

The invention relates to a protection device, in particular to a road surface safety protection device, and aims to solve the technical problem by providing the road surface safety protection device which is safe in safety protection process, high in protection speed and simple to operate. In order to solve the technical problem, the invention provides the road surface safety protection device, which comprises a trolley, a lifting frame, an air cylinder, a connecting block, a horizontal piston, a horizontal cylinder, a hose, a vertical cylinder, a vertical piston, a connecting rod, a pressing block, a connecting rod, a rack, a gear, a rotating shaft, an oscillating rod and a warning sign, wherein the lifting frame is arranged on the trolley; the air cylinder is arranged at the top of the lifting frame; the horizontal cylinder is arranged at the bottom in the lifting frame; the horizontal piston is arranged in the horizontal cylinder; the horizontal piston is in matched contact with the horizontal cylinder; the right side of the air cylinder is connected with the connecting block; and the right side of the connecting block is connected with the horizontal piston. The road surface safety protection device achieves the effects of safe protection process, high protection speed and simplicity in operation, and saves a large number of manpower and material resources.

The invention relates to an over-current or short-circuit state detection circuit of an insulated gate bipolar transistor (IGBT), which comprises a branch circuit, a capacitor, a transistor, a resistor R1, a resistor R2 and a resistor R3, wherein one end of the branch circuit and a negative pole of a power voltage source are electrically connected at a node A, and the other end of the branch circuit, an emitter of a lower bridge arm of a power conversion circuit and a signal grounding terminal of an IGBT driving circuit are electrically connected at a node B; a switching control pole of the transistor and one end of the capacitor are electrically connected at the node B; one end of the resistor R1 is electrically connected at the node A; the other end of the capacitor and the other end of the resistor R1 are electrically connected with a second pole of the transistor; a third pole of the transistor is electrically connected with one end of the resistor R2 and one end of the resistor R3 respectively; the other end of the resistor R2 is connected with high-level chlorinated polyvinyl chloride (PVCC); and the other end of the resistor R3 outputs a guard signal OC. The detection circuit provided by the invention has the advantages of few used elements, low cost, small occupied area of a printed circuit board (PCB) and quick and reliable response, the reduced pressure of the branch circuit does not have disturbance to the IGBT driving circuit, and the power conversion can not influence the reliability and stability of operation.

A special naval vessel outer rail vertical hanging type vessel body washing robot for teenager national defense scientific literacy educational training comprises a naval vessel deck platform 1, a starter 2, a deck magnetic attraction fixing hanging combined control instrument 3, a washing liquid device 4, a robot 5 with a camera head, a human imitated left hand adsorption disc 6, a human imitated right hand adsorption disc 7, a clean water device 8, a human imitated right foot adsorption disc 9, a robot chest disc rotary rolling brush 10, a safety belt 11 with a hanging chain combined data line, a hose 12 and a human imitated left foot adsorption disc 13. The robot has the advantages that safety coefficients are high, protective capacity is high, washing efficiency is high, the robot can be suitable for high-difficulty vessel body washing operation of outer rails of a naval vessel, the robot is an intelligent, professional and practical teaching robot for teenager national defense scientific literacy educational training, exploration of national defense science and technology of teenagers can be promoted, and development of national defense equipment robots is facilitated.

The invention relates to an arc quenching detection method based on optical signals, and belongs to the technical field of power system relay protection. Whether the arc is extinguished or not is judged by detecting the ultraviolet light intensity variable and the visible light intensity variable of the arc specific wave band when the medium-voltage power distribution network switch cabinet breaks through the bottleneck that the grounding fault weak current is small and difficult to detect, and the situation that the arc develops into a stable fault when the medium-voltage power distribution network switch cabinet has the grounding fault is avoided; permanent faults are prevented from being formed, and the operation safety and reliability of the medium-voltage power distribution network switch cabinet are improved. According to the detection method, the grounding arc of the medium-voltage power distribution network switch cabinet is prevented from developing into a stable arc, permanent faults are prevented from being formed, the operation safety and the power supply reliability of the medium-voltage power distribution network switch cabinet are improved, and meanwhile the requirements for the reliability, the sensitivity, the selectivity and the quickness of power system control protection are met.

The invention provides frequency conversion equipment. The frequency conversion equipment is used for performing fault diagnosis on frequency conversion driving on the basis of switching characteristics of an IGBT switch and different gate driving charges of capacitance distribution in a gate charging and discharging process of the IGBT switch. Specifically, in a turn-on transient stage, a turn-on steady-state stage, a turn-off transient stage or a turn-off steady-state stage of the IGBT switch, the variation of the gate driving charges of the parasitic capacitance of an IGBT power module is acquired; the fault condition of the IGBT power module is judged through the variation of the gate driving charges, so that the problem of signal fluctuation caused by direct sampling of gate current can be avoided, misoperation caused by signal fluctuation can be avoided, the fault detection speed is increased, and therefore, the speed of protection for a device can be increased; the detection mode is not sensitive to the temperature characteristic of the device, and the influence of the temperature on a detection circuit can be reduced.