Mini Inverter Transformer changes the AC voltage, current, and impedance of the device, when the primary coil with AC current, the iron core (or core) in the AC magnetic flux, so that the secondary coil induced voltage (or current). Transformer by the iron core (or core) and coil composition, the coil has two or more windings, which is connected to the power supply winding called the primary coil, the rest of the winding is called the secondary coil. The magnetic core of the transformer includes a can-type core, RM-type core, E-type core, EC, ETD and EER-type core, PQ-type core, EP-type core, EP-type core, toroidal core and other magnetic cores.
High-frequency transformer core shape: influence on the operation of switching power supplies
1,Can type magnetic core
Skeleton and winding almost entirely wrapped up by the core, resulting in the EMI shielding effect is very good; can-type core dimensions are in line with IEC standards, in the manufacture of interchangeability is very good; can provide a simple type of skeleton (no pins) and PCB board mounting skeleton (with pins); due to the shape of the design of the can-type shape, resulting in other types of cores of the same size compared to the cost of a higher; due to the shape of the detrimental to the Heat dissipation, so it is not suitable for high-power transformer inductors.
2,RM type magnetic core
Compared with the can type, cutting off the two symmetrical sides of the can type, this re-design is more conducive to heat dissipation and large size leads out; compared with the can type, saving about 40% of the installation of the space; skeleton pinless and pin type; can be used a pair of clips for installation; RM-type cores can be made into a flat shape (suitable for today's planar transformers or directly to the core assembly has been designed to the winding of the Printed circuit board); although the shielding effect is not as good as the can type, still good.
3. E-type core
Compared with the can-type core, the E-type core cost is much lower, coupled with winding and assembly being relatively simple, this core shape is now the most widely used, but its disadvantage is that it can not provide self-shielding; the E-type core can be mounted in different directions, but also a few stacked application of greater power; this core can be made into a flat shape (is now a very popular core shape of the flat transformer); can also provide Pinless and pin-type skeleton; due to its very good heat dissipation, can be stacked, generally high-power inductors and transformers use this shape of the core.
4. EC, ETD and EER-type cores
These types of core structures are between the E-type and the can type. An E-type core can provide enough space for a large cross-section of the lead out (suitable for the current switching power supply low-voltage high-current trend); these shapes of the core heat dissipation is also very good; there is in the centre of the column for the cylindrical, with the same cross-section of the rectangular compared to the length of a single turn of the winding shortened by 11%, which results in copper losses are reduced by 11%, while making the core to provide higher output power. The centre column is cylindrical, with the same section of rectangular compared to the single-turn winding length shortened by 11%, thus resulting in copper losses also reduced by 11%, while making the core provide a higher output power. The centre column is cylindrical, with the same cross-section of rectangular. At the same time, the centre column is cylindrical, compared with the rectangular centre column, it also avoids the hidden danger of damaging the insulation of the winding wire due to the corners of the rectangular body during the winding process.
5, PQ-type magnetic core
PQ cores are specially designed for inductors and transformers for switching power supplies. the PQ shape optimises the ratio between core volume, surface area and winding area; this design makes it possible to use the smallest cores to provide the greatest inductance and maximise the winding area; this design enables maximum output power to be obtained with minimum transformer volume and weight and occupies minimum PCB mounting space; it is possible to use the smallest cores to provide the greatest inductance and maximise winding area; this design enables maximum output power to be obtained with minimum transformer volume and weight and occupies minimum PCB mounting space; it is also possible to use the smallest cores for the smallest transformer volume and weight. PCB mounting space; can use a clip for installation and fixing; this effective design also makes the core of the magnetic circuit cross-sectional area more uniform, so this core structure also makes than other core structure designs have fewer hot spots.
6, EP-type magnetic core
The EP-type core of the round centre column three-dimensional structure, in addition to the end of contact with the PCB board, completely wrapped up the winding, shielding is very good; this unique shape minimizes the impact of the formation of an air gap in the two pieces of the core assembly when the contact surface, and provides a greater volume and total space utilization ratio.
7,Ring Core
For manufacturers, ring cores are the most economical, in its comparable variety of cores, it is the lowest cost; due to the use of the skeleton, additional and assembly costs equal to zero; suitable for when you can use the winding machine for winding; its shielding is also very good.
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Q: What are the key points in the selection of high-voltage ferrite 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: What are the advantages of Mini Inverter Transformers?
A: The biggest advantage of high-frequency transformers is that they can have high energy efficiency in a small size. In addition, they can provide isolated and/or coupled signals or energy, so they are widely used in a variety of fields.
Q: What can a high-frequency transformer do?
A: High-frequency transformers have a wide range of applications, including electronics, electricity, communications, automobiles, military, medical, etc., can be used for power amplification, frequency conversion, inverter, isolation, voltage stabilization, filtering and other power management and signal processing functions, are widely used in a variety of electrical and electronic products.
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