48results about How to "Not to be broken down" patented technology

The invention discloses a high frequency multi-pulse detonation initiation igniter which comprises a stainless steel sleeve serving as a discharging cathode, a copper column sleeved in the stainless steel sleeve and serving as a discharging anode and a ceramic tube with certain thickness, sleeved in the stainless steel sleeve and located between the stainless steel sleeve and the copper column. The igniter adopts a coaxial igniter structure that the cathode of the stainless steel sleeve is arranged on the outmost layer, the anode of the copper column (brass) is arranged at the center of the inmost portion, the thick ceramic tube is adopted between the cathode and the anode for insulation, and the cathode, the anode and the ceramic tube are connected through high temperature resistant epoxy resin. Due to the fact that the insulation ceramic tube is thick, air media still cannot be broken down under the condition that 4000-6000V voltage is added between the anode and the cathode, and discharge is avoided.

An LED driver and an LED lighting device. The LED driver includes: a bridge circuit including first to fourth bridge arms, a first node between the first and second bridge arms, and a bridge between the second and third bridge arms. A second node, a third node between the third and fourth bridge arms, a fourth node between the fourth and first bridge arms, a DC voltage input between the fourth and second nodes, the first bridge arm includes a first Transistors, the second bridge arm includes a second transistor, the first and second transistors are controlled and turned on alternately; a parallel resonant circuit, coupled between the first and third nodes, includes a parallel resonant inductor and a resonant capacitor, parallel resonant The circuit is suitable for driving LED loads; the excitation source circuit is suitable for providing excitation current for the parallel resonant circuit; the starting circuit is suitable for controlling the conduction of the second transistor after the DC voltage is established, so that the parallel resonant circuit starts to vibrate. The LED driver of the invention has excellent load regulation rate and high driving efficiency.

The invention provides a silicon carbide MOSFET and a preparation method thereof. The silicon carbide MOSFET comprises a silicon carbide substrate, a lightly doped epitaxial layer of a first conductivity type, a lightly doped epitaxial layer of a second conductivity type, a contact region, a source region, a gate trench, lightly doped implant region, gate oxide layer, gate electrode, dielectric layer, metal electrode and drain. The silicon carbide MOSFET is provided with a first conductivity type lightly doped implantation region on the inner wall of the gate trench, which can effectively increase the carrier concentration in the channel surface region, thereby effectively improving the channel mobility and reducing the channel resistance.

The invention relates to a detection system for an intelligent liquid crystal display module. An FPGA (Field Programmable Gata Array) controller is respectively connected with an input power supply interface, an upper computer communication interface, an SD (Secure Digital) memory card, a liquid crystal display module interface and a touch screen interface. The liquid crystal display module interface and the touch screen interface can be used for driving liquid crystal display modules with various interface types and various touch screens; the FPGA controller can be in communication with an upper computer on a real-time basis and is used for sending a series of initial set instructions to the detected liquid crystal display module, and the detected liquid crystal display module displays adetection picture on the real-time basis; and the FPGA controller can also read and sequentially display the driving manner, the initial set instructions and the detection picture of the module from the SD memory card so as to realize the offline detection. The detection system has the advantages that the response speed is quick, the various interface types are supported, and the communication with the upper computer can be realized; and the detection system fulfills double protection functions, can quickly switch off the output when the output current exceeds the specified value, can protectthe detected module from breakdown and can be also prevented from burning out by a strong current.

The invention relates to a high-voltage transformer with an epoxy shielding barrel and a manufacturing method thereof. The high-voltage transformer comprises a primary winding, a secondary winding and an iron core, and is characterized in that: the epoxy barrel is sleeved on the outer side of the primary winding; and semiconductor paint is uniformly coated on the inner and outer surfaces of the epoxy barrel, so that the formation of the epoxy shielding barrel of the primary winding is facilitated. The epoxy shielding barrel of the high-voltage transformer is low in cost, the epoxy shielding barrel and the semiconductor paint are convenient to store, can be purchased on a small batch on the market and can be manufactured for constant use at any time, and the processing cost and production efficiency of the transformer are controlled; and meanwhile, electric field distribution can be optimized effectively, the distance between primary and secondary windings is ensured without causing puncture, the service life of an insulating material is prolonged remarkably, and running of equipment is safer and more reliable.

The invention provides an ageing process driven method for plasma display screen which main relates to ageing process used in large-size groove shape plasma display board production process. An ageingprocess driven method only sending a high-voltage firing pulse processes ageing process for display screen before MgO structure parameter stability in PDP production process, this kind ageing processeasy lead to spark phenomenon for some pixel points with unstable parameter, and causes pixel point burnout, reduces producing screen rate. To prevent spark phenomenon in ageing process efficiently,the method provided by the invention changes firing pulse into three pulse signals with various width and breadth during firing, and pulse voltage primary impressed on the display screen is increasedgradually, and high voltage shock to display screen is reduced. Accordingly, display quality of the display screen is ensured, good rate of whole screen is increase and production cost is reduced.