Switching mode power supply transformer
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Switching power transformer power transformer switch is added in the circuit, in addition to the ordinary transformer voltage transform function, but also has high frequency circuit involved in switching power supply and other occasions with isolation and power transfer function of insulation.
Function Editor
The switching power supply transformer and the switch tube together form a self exciting (or excited) intermittent oscillator, which modulates the input DC voltage into a high frequency pulse voltage.
The energy transfer and conversion function. In the flyback circuit, when the switch is turned on, the transformer converts electrical energy into magnetic energy stored in the switch when the pipe stop can release. In the forward circuit, when the switch tube is switched on when the input voltage is directly supplied to the load and the the energy stored in the inductor. When the switch is off, then by the inductive storage were continued to load transfer.
The input DC voltage is converted to a variety of low voltage required.
Classification editor
The switching power supply transformer is divided into a single excited switching power supply transformer and a double excited switching power supply transformer, and the working principle and the structure of the two switching power supply transformers are not the same. The input voltage of single flyback switching power supply transformer is unipolar pulse, but also points forward and flyback voltage output and input voltage; double flyback switching power supply transformer is bipolar pulse, usually bipolar pulse voltage output.
Characteristic parameter editing
Voltage ratio: the ratio of the primary voltage to the secondary voltage of the transformer.
DC resistance: that is, copper resistance.
Efficiency: that is, the output power / input power *100[%]
Insulation resistance: the insulation between the windings of the transformer and the core.
Electrical strength: the transformer can withstand the specified voltage in 1 second or 1 minutes.
Composition editor
Switching power supply transformer main material: magnetic material, wire material and insulation material is the core of the switch transformer.
Magnetic materials: magnetic materials used for switching transformer soft ferrite, according to its composition and application frequency can be divided into MnZn and NiZn two categories. The former has high permeability and high saturation magnetic induction, with low loss in the middle and low frequency range. The core of the shape of a lot, such as type EI. E type, EC type etc.
Conductor material: General for enameled wire winding of small electronic transformer enameled wire with high strength polyester enameled wire (QZ) and polyurethane enamelled wire (QA) two. According to the thickness of the paint layer is divided into 1 types (Bo Qixing) and type 2 (thick paint type) two. The former insulation coating for polyester paint, with excellent heat resistance, insulation dielectric strength up to 60kv/mm; the insulating layer is a polyurethane paint, with strong viscosity, self welding performance (380 C), can not go to the film can be welded directly
Pressure sensitive tape: high dielectric strength of insulating tape, convenient use and good mechanical properties, is widely used in the switch between layers of transformer coils, insulation and insulation. Outsourcing group must meet the following requirements: good tack, peel, has a certain tensile strength, good insulation, good pressure resistance, high temperature resistance and flame retardant
Frame material: switch transformer skeleton and general transformer skeleton, as well as the coil insulation and the supporting materials, but also bear the mounting and positioning of the entire transformer effect, thus making the skeleton material in addition to meet the insulation requirements, there should be considerable tensile strength, at the same time in order to support the pin welding thermal resistance, requirements the skeleton material thermal deformation temperature is above 200, the material must be flame retardant, and also good processing, easy processing into various shapes.
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