The switching power transformer and the switch tube together form a self-excited (or separately excited) intermittent oscillator, which modulates the input DC voltage into a high-frequency pulse voltage, playing a role in energy transfer and conversion. In a flyback circuit, when the switch tube is turned on, the transformer converts electrical energy into magnetic field energy for storage, and when the switch tube is cut off, it is released In a forward converter circuit, when the switch is turned on, the input voltage is directly supplied to the load and energy is stored in the energy storage inductor. When the switch is turned off, the energy storage inductor continues to transfer the input DC voltage to the load. The input DC voltage is converted into various required low voltages. The classification of switching power transformers is divided into single excitation switching power transformers and double excitation switching power transformers, The working principle and structure of the two types of switching power transformers are not the same. The input voltage of a single excitation switching power transformer is a unipolar pulse, and it also has forward and backward voltage outputs; The input voltage of the dual excitation switching power supply transformer is a bipolar pulse, which is generally a bipolar pulse voltage output. Characteristic parameter voltage ratio: refers to the ratio of the primary voltage to the secondary voltage of a transformer. DC resistance: refers to copper resistance. Efficiency: refers to output power/input power * 100 [%] Insulation resistance: The insulation capacity between the windings of the transformer and between the iron core. Dielectric strength: The degree to which the transformer can withstand the specified voltage within 1 second or 1 minute
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