36results about How to "Reduce bad ratio" patented technology

The invention discloses a driving device of an LED tube. The method that a first direct-current voltage which can provide the working voltage of each LED light string of the LED tube is directly output by an AC-DC converter is applied to the driving device of the LED tube. The defects that after an existing AC-DC converter outputs a low direct-current voltage, a DC-DC boost converter is further needed so as to generate a high direct-current voltage which can be provided for the LED light string to enable the LED light string to work in the prior art are overcome. The driving device of the LED tube can reduce generated electromagnetic noise so as to reduce the design difficulty and the design cost of a needed electromagnetic noise interference suppression circuit. The driving device of the LED tube can further reduce the defect ratio of liquid crystal display products which are provided with the driving devices of the LED tubes in a factory and on the market so as to reduce the design cost of power sources of the liquid crystal display products. In addition, due to the fact that the existing DC-DC boost converter is not applied, a constant-current control circuit is adopted to ensure that each LED light string is in the constant-current state in the process of working. Besides, control over opening and closing of the constant-current circuit is used for controlling the average brightness provided by the LED tube. When the LED tube works and the detected voltage of the output end of the LED tube is larger than a protection point set valve, a dimming output port of the control circuit outputs a continuous low level signal to stop normal work of the constant-direct control circuit, the LED tube is finally switched off, and the purpose of protection is achieved.

The invention discloses a method for testing the quota of conductive adhesive for MWT components. The method includes the following steps: step 1, select at least two conductive core boards from the same production line batch as test samples; step 2, prepare EVA strips, make The good mark is used as a cable tie for bundling the conductive core board; step 3, calibrate the electronic scale, and record the weighing result of the conductive core board as W1; step 4, apply glue only to the conductive core board without laying other materials; step 5, brush glue After that, take out the conductive core board, and be careful not to touch the conductive glue, which will cause the weighing inaccuracy. After brushing the glue, the weighing result is W2; in step 6, W2‑W1 is the amount of conductive glue used. The problem to be solved by this method is the large deviation of conductive glue loss caused by the shovel glue and the blockage of the stencil hole.

The invention discloses a sectional material mold with high surface requirements. The sectional material mold comprises a mold body and feeding grooves formed in the mold body. The mold body is further provided with at least one molding cavity communicating with the feeding grooves, the included angle alpha between the side face of each feeding groove and the front end face of the mold body is larger than 90 degrees, and the bottom face of each feeding groove is in the shape with the high middle and the low periphery. The invention further discloses a using method of the sectional material mold with the high surface requirements. The method comprises the steps that 1, a spigot of the mold body and an extruder are assembled together; 2, the mold is fixed and accurately positioned through positioning pins; 3, raw materials are placed in the feeding grooves; and 4, the raw materials are continuously extruded and molded from the molding cavities under the extrusion effect of the extruder. Due to the design, the problem that raw material skin defect tissue flows into an extruded product during extrusion is solved, the extruded sectional material surface quality is improved, the ratio of rejection caused after oxidization is lowered, the workpiece yield is improved, and the cost of a single product is reduced.

The invention discloses an RGB point-controlled intelligent melamine lamp. The melamine lamp string is connected in series on the positive pole and the negative pole of the main line. One end of the plug is connected to the power supply, and the other end of the plug is connected to the resistance wire, varistor, filter and filter circuit. The output terminals of the filter circuit are respectively connected to the input terminal of the MOSFET and the DCDC transformer, and the direct current is output to the drive module and MCU. The MCU passes through The circuit board circuit is connected in parallel with a program module, a button, a remote control module, a WiFi module and a Bluetooth module, the drive module and the transformer output are connected to the MOSFET input, and the MOSFET output is connected to the light string at the end of the main line. The product effect of the point-controlled intelligent melamine lamp of the present invention can be programmed and modified arbitrarily through a computer program to form functions such as single-color control, double-color control, and multi-color control.

The invention discloses an environment-friendly transformer with a housing for potting epoxy resin employing a lost-wax process and a method for preparing the environment-friendly transformer; and the environment-friendly transformer is simple in structure, good in sealing effect and high in insulating protection capability and does not pollute the environment. The environment-friendly transformer comprises a transformer body, wherein the transformer body comprises a skeleton (1), a finished coil wound on the skeleton (1) and a silicon steel sheet (2) sleeving the skeleton (1); a plurality of connection pins (3) are arranged on the upper end surface of the skeleton (1); an integrally molded epoxy resin layer (4) coats the periphery of the overall transformer body; and the connection pins (3) are exposed on the epoxy resin layer (4) at the upper part of the skeleton (1). The preparation method comprises the following steps of (a) prefabricating a wax mold; (b) potting the epoxy resin; (c) putting the wax mold into the transformer body; and (d) removing wax and forming the transformer a demolding manner. The environment-friendly transformer can be used for the field of electronic devices.