mbt shoes italia Satellite TV Receiver 12V DC univ

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Satellite TV Receiver 12V DC universal power input board

20 minutes (Editor's note: In order to increase the supply of time,[link widoczny dla zalogowanych], choose the larger AH of the batteries). E: changes in input voltage regulator on the output performance of the test in the Hai Kewei 2000H receiver to 12V power supply voltage of 32V maximum output board, for example, observed with MF47 multimeter drop its output voltage changes accordingly. Rechargeable battery voltage in the process of gradual decline, the highest value from the start gradually dropped to 10V, the 32V power supply board output voltage remains the same, the battery pack when the voltage drops to 9.5V, 32V voltage drops to 31V, the battery when the voltage drops to 7.6V, 32V voltage drops to 25V. The battery voltage drops to 5V below. 32V voltage drop along quickly, the entire power strip to stop working. In these experiments, the voltage of the power conversion integrated circuit board in the case of no additional heat sink is only warm feeling, is the highest temperature LM2596 voltage regulator block, estimated the surface temperature is below 60. C. Note: Although the power board designed to meet the range of input voltage: DC9 ~ 19V, but with a higher than 12V DC input power is important to note: 1, view the output of the receiver of the original power supply board is a 12V voltage is available rq low level audio to the receiver section. And the low level audio unit is greater than the maximum withstand voltage of the input voltage of the power board 12, if the first is yes. The receiver board 12V power supply path of the Central Plains to replace all the filter capacitor is equal to or higher than the voltage value of 25V capacitor 13, if the output of the receiver of the original power supply board 12V supply voltage while the other circuit elements to be frugal for the corresponding maximum circuit withstand voltage is higher than the metaphor of the power board 7 \ voltage and voltage in this project to determine whether a reliable and working properly first. 4, use the other DC input power, we should pay attention to the no-load output voltage of a 60 to meet the above requirements! F: 220V/12V power adapter output voltage of the test data measuring instrument:: MF47 multimeter (DC: 50V files) , DT890 digital meter (DC: 10A file) load voltage (v) Disconnect the LNB (F head) the first high-frequency current connected remote current load off 120.42 see table 12.2 boot 11.90.56 see table G: 12V input power of the receiver board with the power conversion efficiency of the test using the Hai Kewei 2000H receiver, the viewing parameters in the same conditions, were tested board 12V power input voltage, current, and the output of each group voltage and current. Measuring instruments: DT9205M digital multimeter. Test data as follows: No. Name voltage (V) Current (mA) Power (m \ 『\,) 1 input power 11.986o1O2342 output 3.3V3.37O3.52321.553 output 5V5.1296.51512.154 output 12V11 .94.553.555 output 21V22.31463255.86 output 33V32.6132.6 its efficiency ~ rI = total power output of Pout / Input Power Pin = 0.701 conclusions due to the 12V DC input power board used in the design low-cost composite doubler rectifier LM2596 dual voltage output and LDO linear regulator, its efficiency compared to pure switching power supply circuit LM2596 decreased. But the basic idea to design indicators. Proven, the efficiency of the 12V power supply board several of the original machine is still higher than the efficiency of switching power supply, it can be said that the overall performance of the power board is good. In tests, the author of the conditions, measuring instruments is too small, the accuracy is too low, the test data have some errors may exist. Design of switching regulators using LM2596/LM2585 TV receiver integrated circuit for power supply, power supply can not only improve the work efficiency, reduce energy consumption, reducing thermal damage to the receiver, but also reduce the sharp fluctuations of the received external voltage machine interference, which guarantee safe and reliable operation of the receiver can play a multiplier role. We adopt a 5, as the nickel-metal hydride rechargeable battery portable power supply test samples, the experiment can be seen. 5, Ni-MH rechargeable batteries are in the actual capacity of more than 1000mAH, each charge 10 batteries for the satellite receiver can provide a safe work hours time. If the use of larger-capacity rechargeable battery, continued to believe there will be a longer power supply time. Use rechargeable batteries as power supply, swap star, travel and other special occasions, the application will bring a lot of convenience, which for the majority of the TV friends have a positive reference value. o
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