The meteor shower 5068 digital satellite machine switching power supply core components use low-power power supply integrated block 5L0380R. The working principle is: 220V AC voltage enters the interference suppression filter composed of C101 and L101 through the power switch and the fuse, and then DC voltage of about +300V is obtained by D101~D104 bridge rectification and CDl01 filtering. When the power is turned on, the +300V voltage is applied to the IC101 (5L0380R) pin 3 through the starting resistors R102 and R103. The internal switch is in the micro-conducting state. At this time, the current is passed at the 2 pin of the 5L0380R. The induced electromotive force generated by the 1st and 2nd windings of T101 is coupled to the positive feedback winding 3-4. This voltage is rectified by D106, filtered by CD102 and input to the 3rd pin of IC101, so that the switch tube enters the saturation conduction state and completes the startup process of the switching power supply. The secondary windings of the T101 are supplied to the decoder main board via respective rectification and filtering circuits to output different DC voltages. The stability of the output voltage of the power supply is realized by a +3.3V voltage control optocoupler 1C102 (PC817) through a comparison amplifying circuit composed of R111, R110, R112, C104 and IC103 (TL431A). When the voltage of +3.3V rises for some reason, the voltage of +3.3V is divided by R111 and R110 and then connected to the reference terminal R of IC103, which is compared with the internal reference voltage of IC103. The IC102 is increased by changing the voltage of the control terminal K. The current and luminous intensity of the middle light-emitting diode, IC102 is turned on, so that the voltage conversion tube connected to the IC1014 pin is turned on, and the base of the internal switch tube is clamped to the ground, forcing the power supply to stop vibrating and causing the output voltage to drop. When the voltage of +3.3v is lowered, the voltage regulation process is reversed as described above, thereby stabilizing the output voltage.
FFC connector is a new type of data cable made of PET insulation material and extremely thin tin-plated flat copper wire, which is pressed by high-tech automation equipment production line. It is soft, bending and folding at will, thin in thickness, small in volume, easy to connect, easy to disassemble and easy to solve electromagnetic shielding (EMI).
FPC Flexible Printed Circuit is a form of Circuit produced on a Flexible surface, which may or may not have an overlay (usually used to protect FPC circuits). FPC is more and more widely used because it can bend, fold or repeat motion in a variety of ways and has the advantages of light, thin and flexible compared with ordinary hard board (PCB).
FPC composition materials
1. Insulating film
The insulating film forms the base layer of the circuit, and the adhesive attaches the copper foil to the insulating layer. In a multilayer design, it is then bonded to the inner layer.
They have also been used as a protective cover, in order to make circuit from dust and damp, and the ability to reduce stress during bending, copper foil to form the conductive layer. In some flexible circuits, adopted by the aluminum or stainless steel formed by the rigid member, they can provide the size stability, provides a physical support components and resettlement of the wire, as well as the release of stress.
2, the conductor
Copper foil is suitable for use in flexible circuits, it can use the electric deposition (Electrodeposited, ED.), or plating system.
3. Adhesive
In addition to being used for bonding insulating films to conductive materials, adhesives can also be used as cladding, protective coating, and cladding. The main difference between the two is in the application in which the covering layer is bonded to the covering insulating film in order to form a laminated structure of the circuit.
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