"Switching transformer" generally refers to the transformer used in "switching power supply". When working in a pulse state of a frequency of ten to several tens of kilohertz or even hundreds of kilohertz, the iron core is generally made of ferrite material. The switching power supply transformer is a power transformer with a switching tube. In addition to the voltage conversion function of the ordinary transformer, the circuit also has the functions of insulation isolation and power transmission, which are generally used in switching power supplies and the like involving high frequency circuits.
Switching transformer parametersVoltage ratio : refers to the ratio of the primary voltage of the transformer to the secondary voltage.
DC resistance : that is, copper resistance.
Efficiency : output power / input power * 100 [%].
Insulation resistance : The insulation capability between the windings of the transformer and between the cores.
Electric strength : The degree to which the transformer can withstand the specified voltage within 1 or 1 minute.
Switching power supply transformer winding method1. Main output magnetic core transformer B1 winding method main output magnetic core transformer B1 winding method
Transformer B1 winding connection diagram
Winding method: (from inner layer to outer layer order) (core without air gap)
Transformer B1 pin diagram
Pay attention to the problem of the same name when winding. First, lay a layer of insulation on the column in the skeleton and start winding. N2, N3, N4 have different voltages, which can be wound around the same layer, separated by a distance, and covered with insulating paper. Other non-common ground windings are separated by three layers of insulation, and finally three layers of insulation are outsourced.
Due to the different winding winding methods and processes, the output voltage may be slightly deviated. The output voltage can be adjusted in a small range by adjusting the magnitude of the dummy load resistance around the parameters given in the component table.
2. Driving magnetic core transformer winding method
Transformer B2 winding connection diagram
Winding method: (from inner layer to outer layer order) (core without air gap)
Transformer B2 pin diagram
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The connection sequence of RJ-45 line in common B standard is orange white, orange, green white, blue, blue white, green, brown white and brown. When connecting different equipment, use standard a. the connection sequence is green white, green, orange white, blue, blue white, orange, brown white and brown. Generally, the pressing method of b-mark is commonly used. If you want to make a cross line, one side is a standard, and the other side is b standard.
Working in the data link layer, the switch has a high bandwidth back bus and internal exchange matrix. All ports of the switch are connected to the back bus. After the control circuit receives the data packet, the processing port will look up the address reference table in memory to determine which port the NIC (network card) of destination MAC (hardware address of network card) is attached to. The data packet is quickly transmitted to the destination port through the internal exchange matrix. If the destination MAC does not exist, it will be broadcast to all terminals After the receiving port responds, the switch will "learn" the new address and add it to the internal MAC address table. The switch can also "segment" the network. By comparing the MAC address table, the switch only allows the necessary network traffic through the switch. Through the filter and forward of switch, the conflict domain can be effectively reduced, but it can not divide network layer broadcast, that is, broadcast domain. The switch can transmit data between multiple port pairs at the same time. Each port can be regarded as an independent network segment, and the network equipment connected to it can enjoy all the bandwidth without competing with other devices. When node a sends data to node D, node B can send data to node C at the same time, and these two transmissions enjoy the full bandwidth of the network and have their own virtual connections. If a 10Mbps Ethernet switch is used here, the total flow flux of the switch is equal to 2 × 10Mbps = 20MBps, and the total flow flux of a hub will not exceed 10Mbps when using 10Mbps shared hub. In a word, switch is a kind of network equipment based on MAC address recognition, which can encapsulate and forward data frames. The switch can "learn" the MAC address and store it in the internal address table. By establishing a temporary exchange path between the originator and the target receiver of the data frame, the data frame can reach the destination address directly from the source address.
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