33results about How to "Does not affect conversion efficiency" patented technology

The present invention provides a DC-DC converter providing a DC output voltage at an output node. The DC-DC converter comprises an output stage, a digital controller, and a controller. The output stage comprises a pull-up circuit having a control terminal and coupled between a first fixed voltage and a internal node, a pull-down circuit coupled between the internal node and a second fixed voltage, and a low pass filter coupled between the internal node and the output node. The digital controller is powered by the DC output voltage and adjusts the DC output voltage by controlling the output stage. The controller controls a connection of a feedback path, comprising the digital controller, between the output node and the control terminal according to the DC output voltage.

The invention discloses a method for reducing hidden cracking of a back electrode region of a MWT (Metal Wrap Technology) battery. In the preparation process of a positive electrode region of a back electrode of the MWT battery, hollow-out and antenna designs are adopted for the positive electrode region; the hollow-out design is that a plurality of non-printing regions are arranged in a middle region of a positive pole printing region, and the antenna design is that a plurality of printing regions are arranged in an edge region of the positive pole printing region; in the preparation processof an aluminium back field, a hollow-out design is adopted for a region of the aluminium back field, which is overlapped with the positive electrode region; and the hollow-out design of the aluminiumback field is that a plurality of non-printing regions are arranged in the overlap region of the aluminium back field and the positive electrode region. The hollow-out design of the positive electroderegion can effectively reduce an overall height of the positive electrode region under the condition of ensuring that a welding area of a component is unchanged, and the antenna design can reduce a coverage area of the overlap region under the condition of effectively ensuring current transmission of the positive electrode region and the aluminium back field. The hollow-out design of the overlapregion of the aluminium back field can reduce a height of the overlap region under the condition of ensuring that an area of the overlap region of the aluminium back field and the positive electrode region is unchanged.

The invention relates to a straw treatment method and its application, including a wet storage control stage, the wet storage control stage includes: adjusting the moisture content of the straw to 70% to 80%, and then fermenting under anaerobic conditions, during the fermentation process The pH value of the medium is maintained at 5.2-6.0. The straw treatment method provided by the present invention can extract various organic acids, such as lactic acid and butyric acid, to increase economic benefits by adjusting the moisture content and the pH value in the wet storage process, and extruding the liquid part after anaerobic fermentation. Each ton of corn straw can produce 53kg of lactic acid and 45kg of butyric acid without affecting the methane conversion efficiency of the solid part, which can greatly improve the economic benefits of the process and promote the development of the straw biogas engineering industry.

The invention provides an average current detection circuit applied to a DC-DC converter, which relates to the field of integrated circuits. The average current detection circuit includes an average current sampling module, a current conversion module, and an integral comparison module connected in sequence, and the average current sampling module It includes a high-side current detection circuit, a resistor R31, and an NMOS transistor MN31; the current conversion module includes an operational amplifier U1, an NMOS transistor MN32, and a resistor R32; the integral comparison module includes a PMOS transistor MP32, a switch S31, a capacitor C31, and an NMOS transistor MN41 , comparator U2, NMOS tube MN42, capacitor C41, switch S32; the average current detection circuit of the present invention will not affect the conversion efficiency, and can allow DC-DC to switch between PWM mode and PFM mode at a constant load current, with high conversion Efficiency, strong versatility and precision.

The invention discloses a single crystalline silicon solar cell. The single crystalline silicon solar cell comprises a silicon chip and electrode grid lines, wherein the silicon chip is provided with a pyramid-structure texturing surface, and the included angle between the tangent line of each portion of the electrode grid lines and one of the four edges on the bottom surface of a certain pyramid structure ranges from 0 degree to 10 degrees or from 80 degrees to 90 degrees. According to the single crystalline silicon solar cell, the bottom edges of the pyramid structure of the texturing surface of the silicon chip can be effectively used for transmitting photoproduction electrons, the transmission distance of the photoproduction electrons on the surface of the silicon chip is shortened, collection efficiency of the electrons is effectively improved, and then cell conversion efficiency is improved; the density of the grid lines can be reduced under the condition that the cell conversion efficiency is not affected, and then the cost is reduced.

The disclosed thermal-lensing compensation method for laser rod comprises: setting the holophote with a step-motor driving movable mechanism in optical resonator of laser as raised convex mirror toward the laser rod; controlling the step motor by a computer to make the distance from mirror to rod as a = f - R / 2 - d / 2n. Wherein, R for curvature radius of the mirror, d for rod length, n for refractive index of rod, and f for lens focus. This invention simplifies system structure, affects no energy conversion efficiency, and applies computer to control laser frequency N and pumping energy density Ep for complete automatic compensation.

The invention provides a polycrystalline solar cell surface silicon nitride antireflection film preparation method, which solves the technical problems that an existing solar cell is simple in structure, is easy to have continuous attenuation and is poor in product stability. The polycrystalline solar cell surface silicon nitride antireflection film preparation method comprises the following steps: a) carrying out cleaning, texturing, diffusion and etching on a crystalline silicon wafer; b) enabling the crystalline silicon wafer obtained after the step a) to pass through an ozone generation device to generate a 1-2 mm SiO2 oxidation film on the surface of the silicon wafer; c) cleaning a graphite boat through a cleaning device, placing the crystalline silicon wafer obtained after the step b) on the graphite boat, and placing the graphite boat loaded with the wafer to a tubular PECVD for pre-deposition and cleaning; d) carrying out tubular PECVD deposition on the crystalline silicon wafer obtained in the step c); and e) carrying out tubular PECVD deposition again on the crystalline silicon wafer obtained in the step d). The method has the advantages of stable and reliable product.

The invention relates to a pore-filling slurry and its preparation method and application. The pore-filling slurry consists of 75-85% of special glass powder and 10-25% of an organic carrier. The composition (percentage by weight) of described glass powder: Bi 2 o 3 75%~85%, SiO 2 2~10%, Al 2 o 3 1~5%, B 2 o 3 5~20%, other additives 2~8%. Using the hole-filling paste of the present invention, after printing the front grid electrode, use special equipment to point the hole-filling paste into the pinholes of the battery sheet, which can be used for hole-filling of solar silicon pinhole sheets, and the batteries with pinholes Tablets are used effectively.

The invention discloses a sulfidizing process for the gate lines of solar cell pieces. According to the sulfidizing process, heating treatment is carried out on the solar cell pieces with the sulfidized gate lines at a heating temperature of 350+ / -10 DEG C for at least 80 seconds, and then cooling to obtain products. The solar cell pieces with the sulfidized gate lines are heated by virtue of a sintering furnace on a solar cell piece production line, the running speed of the conveying belt of the sintering furnace is 250+ / -10in / min, the temperature of the drying area of the sintering furnace is 350+ / -10 DEG C, the temperature of the sintering area is 450+ / -10 DEG C, and the solar cell pieces are arranged on the conveying belt and sequentially pass through the drying area and the sintering area. According to the sulfidizing process disclosed by the invention, after the heating treatment is carried out on the solar cell pieces with the sulfidized gate lines, silver sulphide can be completely decomposed, thus achieving the purposes of achieving sulfidizing removal and avoiding poor appearance, and avoiding influence on the conversion efficiency of the cell pieces. The sulfidizing process disclosed by the invention is simple, low in implementation cost, and beneficial to wide popularization and application.

The invention discloses a height-adjustable new energy photovoltaic bracket and a support installation method, including a support mechanism, an adjustment mechanism and a photovoltaic panel. The support mechanism includes a base, a support column, a horizontal beam and two upright columns. The adjustment The mechanism includes a threaded adjustment rod, a threaded sleeve, two extension rods, two hinged plates and two supporting beams, the photovoltaic panel is located between the two supporting beams, and the center positions of the left and right ends of the photovoltaic panel are fixed respectively There are a first plug-in column and a second plug-in column, and the photovoltaic panel is respectively connected to the middle section of the opposite side wall of the two support beams through the first plug-in column and the second plug-in column. When the photovoltaic panel is installed, the height of the bottom of the front end of the photovoltaic panel can be adjusted to meet the adjustment of the supporting angle of the photovoltaic panel, so that the photovoltaic panel can obtain the maximum power generation efficiency and can prevent birds from building nests or excreting feces on the photovoltaic panel , does not affect the photovoltaic panel's daily acceptance of sunlight for electrical energy conversion operations.