The Chinese nine receiver is changed to 12V power supply ----- DC Power Supply for Satellite TV Receiver

Keywords: Zhongjiu, receiver After the Chinese nine machines are changed to 12V, they can be used for field movement or in-vehicle viewing. Because the power consumption of the main board of the nine machine motherboard is more than doubled, the power of the power conversion plate must be large enough. This paper uses TL494 and high power MOS tube structures, and output power can reach 10W. It has power consumption limiting function, so it is not afraid of load short circuit. T1 is the switching transformer, the magnetic core specification is EE28. Because the channels on the current in the present are the same polarization, the right right and voltage (14V) is omitted in this power supply. The primary wire diameter is 0.5mm, the + 3.3V winding line diameter in the secondary is 0.45mm, and the + 18V winding line diameter is 0.3mm. Both D2, D3, C4, C5, C6, and L1 can utilize elements corresponding to the original receiver source board. The tests are at +3. 3V output and + 18V outputs, 10Ω and 100Ω fake loads are connected, and the DC power supply is connected to the power supply. When the power supply voltage of the output is changed between 8V to 15V, the output voltage should remain stable. J1 is a 4PIN cable plug, which is connected to the power supply of the motherboard. Q4 selects 10A100V MOS tube, such as 10 N10, and does not require a heat sink. The K3638 demolished from the old computer motherboard is very good. Author: Zhang Fengmei

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