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  • 8+8 pin EE65 transformer Bobbin
    EE65 High Power Transformer Horizontal Frame

    EE65 single phase transformer. Horizontal EE65 bobbin 8+8 pins. Bobbin Size=51.5mmX43.7mmX54.8mm. Parallel Distance=44.5mm. Pin pitch=5.0mm. Good quality EE65 encapsulated transformer, singled packed with carton.

  • 6+6 Pins EF30 Vertical Bobbin
    EF30 Power Transformer Vertical Bobbin 6+6 Pin

    EF30 rectifier transformer. 6+6 pins vertical EF30 coil former. Bobbin Size=35.3mmX19.0mmX34.8mm. Pin pitch=5.08mm. Parallel Distance=15.24mm. SMPS transformer has small size, high power and low cost, we design and manufacture high frequency transformer.

  • PQ50 Electronic Transformer Bobbin
    PQ50 Vertical High Frequency Transformer 6+6 Pin Bobbin

    6+6 pins PQ50 coil former. PQ phenolic material bobbin. Bobbin Seize=51.5mmX50.8mmX51.5mm. Parallel Distance=45.65mm. PQ50 Vertical bobbin for power transformer. Make bobbin tooling.

  • Electronic Impedance Matching and Maximum Power Transformers
    High Frequency Matching Transformer for Switching Power Supplies

    High Frequency Electronic Matching Transformers are intended for measuring electric signal voltages or currents which contain useful data. They match the signal source with the load ensuring the minimum signal distortion. Along with active components (such as transistors and lamps) they are included into devices amplifying electric oscillations that work within a wide frequency band.

What Limits The Miniaturization Of The Power Supply Module

July 22,2019.

With the development of power modules, engineers have focused on how to make modules smaller and lighter. In fact, we all know that we can increase the power density of products by increasing the switching frequency. But why has the volume of the module so far not changed so much? What limits the increase in switching frequency?

In order to meet the current portable electronic terminal equipment, the switching power supply must be smaller, lighter, high-efficiency and low-radiation. However, there are mainly three factors restricting the frequency of switching power supplies: switch tubes, transformers, and EMI and PCB design.

1.Switching tube as the core device of switching power supply module, its switching speed and switching loss directly affect the limit of the switching frequency.

2.Transformer iron loss is proportional to the kf power of the switching frequency, and it is related to the limitation of the magnetic temperature. Therefore, as the switching frequency increases, high-frequency currents flow in the coil and cause severe high-frequency effects, which reduces the transformer's conversion. Efficiency causes the transformer temperature to rise, thereby limiting the switching frequency.

3.At high frequencies, the inductor is no longer the inductor we are familiar with. The capacitor is not a capacitor that we already know. All parasitic parameters will have corresponding parasitic effects, which will seriously affect the performance of the power supply, such as the parasitic capacitance of the primary side of the transformer, and the transformer. Leakage inductance, parasitic inductance and parasitic capacitance between PCB layouts can cause a series of voltage and current waveform oscillations and EMI problems, and it is also a test for the voltage stress of the switch tube.

To increase the power density of switching power supply products, the first consideration is to increase the switching frequency, which can effectively reduce the volume of transformers, filter inductors, and capacitors.

As electronic transformer manufacturer, we have been producing and designing various high frequency flyback transformers, current transformers, coil inductors. We also OEM some filters such as EMI filter used for AC power line. Our goal is to increase the efficiency of electronic transformers and provide customers with high quality electronic components.

ER28 High Frequency Transformer Factory

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