40results about How to "Reduce current loss" patented technology

The invention relates to the technical field of solar cell preparation, and especially relates to a double-sided POLO (POLy-Si on passivating interfacial Oxides) battery and a preparation method thereof. Silicon oxide and a polysilicon layer are used to perform double-sided passivation, wherein the first function is that the surface defects of a silicon wafer surface are not only passivated and the response of weak light is increased, but also the contact between metals on the back and a semiconductor is passivated, and a contact negative charge value is reduced; and the second function is that there is no point contact due to complete passivation, a base region has no transverse transmission of minority carries or majority carries; and the third function is that the polycrystalline silicon is an indirect band gap, and the current loss is small.

The invention discloses a method for reducing the concentration of lead ions in a lead electrolyte. The method is applied in an electrolytic refining process of lead and comprises the following steps: (1) casting by virtue of a vertical die to obtain anode plates of which sizes are 1210*810*27mm and preparing cathode starting sheets of which sizes are 1370*840*(0.85+/-0.05) mm by virtue of a cathode sheet processing machine; (2) arranging pitches between the newly manufactured cathode starting sheets and the anode plates by virtue of an automatic pitch arranging machine, loading into a tank, switching the direct current on and electrolyzing for 3.5-4 days; and (3) taking the cathodes out, reloading the newly manufactured cathode starting sheets, continuously electrolyzing for 3.5-4 days and taking the cathodes and residual anodes out so that an electrolytic period is completed. The method disclosed by the invention has the characteristics that the effect of reducing the concentration of lead ions in a lead electrolyte is obvious and economic and technical indexes such as the current efficiency, the rate of residual anodes and energy consumption are significantly improved, and is economical, environmentally friendly and strong in operability.

The invention provides a method for generating dozens of megampere pulse currents and a z-pinch direct drive source. The drive source comprises a primary pulse power source (thousands of fast discharge branch circuits are connected in parallel), a high-voltage transmission cable, a water medium electromagnetic induction chamber, a secondary MITL (Magnetically Insulated Transmission Line) and a z-pinch load, wherein the secondary MITL is formed by connecting multi-stage induction chambers in series; the z-pinch load is located on an axis; thousands of primary discharge branch circuits are located at the peripheries of the induction chambers and are divided into dozens of groups; the primary discharge branch circuits discharge rapidly to directly obtain an electric pulse with a leading edge of 100-200 ns, a voltage of 100-200 kV and a current of 30-50 kA. Currents of the thousands of branch circuits are transmitted and gathered on cable interfaces, which are uniformly distributed at the peripheries of the induction chambers, of dozens of I-shaped tri-plate transmission lines through the cable; the currents are gathered to the induction chambers for primary excitation through the tri-plate transmission lines; and the current gathering is realized through electromagnetic induction. Multi-stage induction chambers are connected in series to form an IVA (Induction Voltage Adder); the MITL is employed for a secondary stage of the IVA to realize voltage superimposition and power transmission; an ultra-high power electric pulse with a voltage of dozens of MV, a current of dozens of MA and a leading edge of 100-200 ns is generated on the Z-pinch load of the axis, and the requirement of a drive current of a Z-pinch ICF (Inertial Confinement Fusion) is met.

The invention provides a solar cell piece and a preparation method thereof and a solar cell module, wherein the solar cell piece is provided with metal grid lines which are low in electrical resistivity in a transparent conducting layer, so that the collection capacity of the transparent conducting layer on carriers can be greatly improved, the resistance of the transparent conducting layer is lowered, and the current loss during working of the solar cell is lowered; the thickness of the transparent conducting layer can be reduced by arranging the metal grid lines, so that the light transmittance is improved, and the photoelectric conversion efficiency of the solar cell is improved; meanwhile, the width of a sub battery can be properly increased, so that the number of scribed lines is reduced, and the dead zone area is reduced; in addition, compared with a continuous metal film layer, the light transmission area on the metal grid lines can further improve the light transmittance; the metal grid lines are covered with a first transparent thin film layer, so that the appearance consistency of the solar cell pieces can be improved; and the first transparent thin film layer can also protect the metal grid lines from being oxidized, so that the reliability of the solar cell is improved.

The invention discloses an electrode short circuit detection method and system based on conducting bar temperatures. The method comprises the steps that change of temperatures of a boss which is located on a conducting bar and is in overlap joint with an electrode contact spike is obtained; multiple temperature values within the set time period are obtained; whether the multiple temperature valuesare larger than the set temperature value or not is judged, if yes, it is determined that a short circuit occurs to an electrode in the corresponding position, and if no, the increment, changing along with time, of the multiple temperature values is determined; whether the increment is within the set temperature range or not is judged, if yes, the multiple temperature values are fitted in chronological order through a linear fitting method, and a linear model is obtained; the slope and the determination coefficient of the linear model are obtained; and whether the slope is within the set slope range or not is judged, if yes, whether the determination coefficient is smaller than the set determination coefficient value or not is judged, if no, it is determined that the short circuit occursto the electrode, and the electrode is free of short circuit under other conditions. By adopting the electrode short circuit detection method and system, whether a short circuit occurs to a cathode and an anode or not can be quickly found, after timely treatment, the electrolytic current efficiency and the product quality can be remarkably improved, and the product cost is reduced.

The invention discloses a welding method of a superconducting film material, which comprises the following steps that S1, a silver coating of a superconducting bare tape is covered with a plating layer, wherein the plating layer contains metal, and the resistivity of the metal is 10 <-8> omega.m magnitude or below; S2, bonding and fixing the welding parts of the adjacent superconducting bare tapes; and S3, placing the welding part under the conditions that the temperature ranges from 20 DEG C to 300 DEG C, and the pressure ranges from 0.02 MPa to 2 MPa, filling a joint with a welding flux, andobtaining the bare tape body. According to the invention, the silver coating can still maintain the original protection effect, so that a YBCO layer is not easy to damage, and the performance of thebare tape body after welding is improved.

The invention discloses a current boosting device, a current transformer and a current testing method, wherein the current boosting device is applied in the current transformer and a secondary open winding of the current transformer. The current boosting device comprises the components of a wiring part which is used for connecting with the secondary winding of the current transformer; an input coil which is connected with one end of the wiring part and winds one side of a magnetic core, wherein the side of the wiring part deviates from the current transformer; an output coil which winds the other side of the magnetic core; wherein the magnetic core is made of silicon steel sheet; and a measuring part which is connected with the output coil in an end-to-end manner, wherein a turn ratio between the input coil and the output coil is a preset number which is larger than 1. The current boosting device prevents incapability of measuring amplitude and phase of the to-be-measured current caused by oversmall current at the secondary winding side of the current transformer. Furthermore because the magnetic core is made of the silicon steel sheet with relatively high resistivity and highest magnetic conductivity, loss current reduction of the magnetic core is realized, thereby reducing loss of the magnetic core, and furthermore improving current amplifying capability of the current boosting device.

The invention relates to an insulating property monitoring device and an insulating property monitoring method of a high-voltage switching apparatus. The monitoring device comprises a sampling resistor and a sample processing device which is connected with the sampling resistor, wherein the sampling resistor and the sample processing device are arranged between the insulating shell of the high-voltage switching apparatus and the ground; and the sample processing device comprises a power supply device which provides power for the sample processing device and a transducer which is used for transmitting a signal. The monitoring method comprises the following steps that: the sampling resistor and the sample processing device which is connected with the resistor are arranged between the insulating shell of the high-voltage switching apparatus and the ground; the sample processing device converts a current or voltage signal of the sampling resistor into the standard current or voltage signal and outputs the standard current or voltage signal to externally connected equipment; and the externally connected equipment is compared with a preset value according to the standard current or voltage signal so as to judge whether the insulating property of the shell of the high-voltage switching apparatus is good or not. The device and the method of the invention have the advantage of timely monitoring the insulating property of the shell of the high-voltage switching apparatus and saving the maintenance cost.