A High Voltage Pulse Transformer is a specially designed transformer that usually operates at a frequency higher than the intermediate frequency (10 kHz), hence the name high-frequency transformer. Its main role is to convert alternating current into high-frequency alternating current to meet the needs of different types of power electronic devices. Specifically, high-frequency transformers can be used in high-frequency switching power supplies to convert the high-frequency voltage of their output into the desired low-voltage output, which is very important in power electronics systems. In addition, high-frequency transformers are also commonly used in high-frequency inverter power supplies as well as high-frequency inverter welding machines, where they play a central role as a core component.
Core selection for high-frequency transformers
The core selection of high-frequency transformers should mainly follow the following criteria:
1. High initial permeability: Permeability is a parameter that reflects the magnetic permeability of the core to the magnetic field, and choosing a core with high permeability helps to improve the efficiency of energy transmission.
2. Low coercivity: Coercivity is an indicator of the energy stored in the core, and a low coercivity core can reduce hysteresis losses, thereby improving the efficiency and power density of the transformer.
3. High saturation magnetic induction intensity: Saturation magnetic induction intensity refers to the maximum magnetic field strength that the material can achieve, and the core with high saturation magnetic induction intensity can provide higher energy conversion efficiency.
4. Low residual magnetic flux density: residual magnetic flux density refers to the ratio of the magnetic flux generated by the core itself to the working magnetic flux in the magnetic circuit system, and the low residual magnetic flux density means that the core has less impact on the system.
5. High resistivity and high temperature stability: High resistivity and high temperature stability help to reduce the self-induced electromotive force of the core and also help to improve the safety and reliability of the transformer.
The main types of high-frequency transformer cores are ferrite cores, powder cores, and nanocrystal line cores. When selecting a specific core material, it is necessary to combine specific design requirements and performance indicators, as well as consider factors such as the cost and availability of materials.
The winding process of a high-frequency transformer
The winding process of a high-frequency transformer can be divided into the following steps:
1. Preparation: Ensure that the required materials and tools are complete and carry out the clearance operation.
2. Determine the winding direction: Usually the opening in the lower left corner is selected as the starting point of winding, that is, 1 pin (also known as Pin 1).
3. Winding the original edge: use a 0.18 mm line, start winding from the 1 foot of the eponymous end, and wrap it one turn at a certain interval. Each full layer is usually about 70 turns, which depends on the size of the skeleton and wire diameter.
4. Winding auxiliary winding: You can choose different winding methods, such as the double winding method, or directly winding auxiliary winding and output winding on the basis of the primary edge.
5. Treatment after winding: including fixing the winding wire harness on the skeleton, wrapping it with Mylar tape to protect the wire, and insulating the winding if necessary.
In the winding process, the following points need to be noted:
Use multiple strands of thin copper wire and wound them together instead of a single thick copper wire to improve the surface area and efficiency of the wire.
The layered, segmented winding method is used to reduce high-frequency leakage inductance and reduce distributed capacitance.
For high-frequency transformers, priority should be given to the use of enamelled wires with good insulation properties and proper insulation treatment after winding.
In practice, the number and layout of the windings also need to be determined according to the specific transformer design, as well as whether additional insulation measures are required. At the same time, ensure that all operational details meet safety specifications, especially when handling high-pressure components.
The role of high-frequency transformers
1. To improve the conversion efficiency, use the power supply of a high-frequency transformer because the power supply tube works in the state of instantaneous on-off, that is, the state of non-stop conversion when it is turned on and off, so we call it "switching power supply.". The loss is about 30% lower than that of traditional core transformers. Unfortunately, the failure rate is relatively high.
2. The high-frequency pulse can be transformed, and the ordinary transformer core does not have the high permeability of the ferrite core. I can't do that.
3. To improve the conversion efficiency, use the power supply of a High Voltage Pulse Transformer because the power supply tube works in the state of instantaneous on-off, that is, the state of non-stop conversion when it is turned on and off, so we call it "switching power supply.". The loss is about 30% lower than that of traditional core transformers. Unfortunately, the failure rate is relatively high. What can be learned is the comparison between old-fashioned ballasts and electronic ballasts.
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Q: What is the function of a high-frequency transformer?
A: The main function of a high-frequency transformer is to convert voltage. It converts the low voltage of the high-frequency power supply circuit into a high voltage, so that the electronic device can work normally.
Q: What are the key points in the selection of high-frequency transformers?
A: When selecting a high-frequency transformer, you need to consider factors such as the input voltage and output voltage (specification, frequency, and waveform) of the power supply, the output power (load characteristics and operating environment), temperature range, and electromagnetic compatibility. At the same time, it is also necessary to consider the quality of the material, the requirements of the manufacturing process and cost control.
Q: How to use high-frequency transformer?
A: High frequency ferrite transformers are usually used in power converters, amplifiers, voltage regulators, filters and other circuits to reduce or increase voltage, transmit signals, and isolate circuits.
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