CN214797050U - Low-voltage large-current output high-frequency transformer for switching power supply - Google Patents
Low-voltage large-current output high-frequency transformer for switching power supply Download PDFInfo
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- CN214797050U CN214797050U CN202023346761.2U CN202023346761U CN214797050U CN 214797050 U CN214797050 U CN 214797050U CN 202023346761 U CN202023346761 U CN 202023346761U CN 214797050 U CN214797050 U CN 214797050U
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Abstract
The invention provides a high-frequency transformer of a switching power supply with low voltage and large current output, which comprises a magnetic core, a primary winding and a secondary winding, wherein the primary winding is two double-layer PCBs (printed circuit boards), and a primary auxiliary winding is a PCB; the secondary winding is formed by connecting two special-shaped stamping copper foils in parallel through a T-shaped guide pin, the primary winding is arranged on the secondary winding, and the magnetic core is arranged at the outer edges of the primary winding and the secondary winding. The utility model has simple structure, the primary winding is two double-layer PCBs, and the primary auxiliary winding is a single-layer PCB; the secondary winding is formed by connecting two special-shaped stamping copper foils in parallel through a T-shaped guide pin; the primary winding and the secondary winding are in a laminated structure, the coupling effect between layers is improved, and the leakage inductance is effectively reduced.
Description
Technical Field
The invention relates to a high-frequency transformer of a switching power supply with low voltage and large current output.
Background
The high-frequency transformer is a power transformer with the working frequency exceeding the intermediate frequency (10kHz), is mainly used as a high-frequency switching power transformer in a high-frequency switching power supply, and is also used as a high-frequency inverter power transformer in a high-frequency inverter power supply and a high-frequency inverter welding machine. A transformer is a device for transforming ac voltage, current and impedance, and when an ac current flows through a primary winding, an ac magnetic flux is generated in an iron core (or a magnetic core), so that a voltage (or a current) is induced in a secondary winding.
The transformer consists of an iron core (or a magnetic core) and a coil, wherein the coil is provided with two or more than two windings, the winding connected with a power supply is called a primary coil, and the rest windings are secondary coils.
In the design of high-frequency transformers, the leakage inductance and distributed capacitance of the transformer must be minimized because high-frequency square-wave signals are transmitted by the high-frequency transformer in the switching power supply. During the transient of transmission, leakage inductance and distributed capacitance can cause surge current and peak voltage, as well as top oscillation, resulting in increased losses. Therefore, it is one of the problems to be solved at present to develop a method for effectively reducing the loss.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides the high-frequency transformer of the switching power supply, which can effectively reduce the loss of low-voltage large-current output.
The technical scheme is as follows: the invention provides a high-frequency transformer of a switching power supply with low voltage and large current output, which comprises a magnetic core, a primary winding and a secondary winding, wherein the primary winding is two double-layer PCBs (printed circuit boards), and a primary auxiliary winding is a single-layer PCB; the secondary winding is formed by connecting two special-shaped stamping copper foils in parallel through a T-shaped guide pin, the primary winding is arranged on the secondary winding, and the magnetic core is arranged at the outer edges of the primary winding and the secondary winding. The invention has simple structure, the primary winding is between two double-layer PCB layers, and the magnetic flux between turns is not completely coupled
The primary winding is made of two double-layer PCBs and is connected with a center tap through a T-shaped guide pin.
The primary auxiliary winding is completed by a double-layer PCB.
The thickness of the special-shaped stamping copper foil is 0.3 mm.
And the secondary winding forms patch installation through a T-shaped guide pin.
And an insulating pad is arranged between the primary winding and the secondary winding.
Has the advantages that: compared with the prior art, the switching power supply transformer with low voltage and large current output provided by the invention has the following advantages:
1. the utility model has simple structure, the primary winding is two double-layer PCBs, and the primary auxiliary winding is a single-layer PCB;
the secondary winding is formed by connecting two special-shaped stamping copper foils in parallel through a T-shaped guide pin; the primary winding and the secondary winding are in a laminated structure, the coupling effect between layers is improved, and the leakage inductance is effectively reduced.
2. The utility model discloses an establish insulating pad between primary and secondary, the dielectric strength between multiplicable primary and the secondary accords with the withstand voltage's requirement.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a profile-stamped copper foil structure;
wherein: 1. magnetic core, 2 primary winding, 3 secondary winding, 4T type guide pin.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Examples
As shown in fig. 1, a high-frequency transformer of a switching power supply with low voltage and large current output comprises a magnetic core 1, a primary winding 2 and a secondary winding 3, wherein the primary winding 2 is two double-layer PCBs and is connected with a center tap through a T-shaped guide pin 4; the primary auxiliary winding is a double-layer PCB; the secondary winding 3 is formed by connecting two special-shaped stamping copper foils in parallel through a T-shaped guide pin 4, as shown in figure 2, a primary winding 2 with the thickness of 0.3mm of the special-shaped stamping copper foils is arranged on the secondary winding 3, and a magnetic core 1 is arranged at the outer edges of the primary winding 2 and the secondary winding 3; and an insulating pad is arranged between the primary winding and the secondary winding 3.
The utility model has simple structure, the primary winding 2 is two double-layer PCBs, and the primary auxiliary winding is a single-layer PCB; the secondary winding 3 is formed by connecting two special-shaped stamping copper foils in parallel through a T-shaped guide pin 4; the primary winding 2 and the secondary winding 3 are in a laminated structure, the coupling effect between layers is improved, and the leakage inductance is effectively reduced.
An insulating pad is arranged between the primary winding and the secondary winding 3; the insulating strength between the primary winding and the secondary winding can be increased, and the requirement of insulating and voltage-resisting is met.
Claims (6)
1. The utility model provides a switching power supply high frequency transformer of low-voltage heavy current output which characterized in that: the transformer comprises a magnetic core, a primary winding and a secondary winding, wherein the primary winding is two double-layer PCBs, and a primary auxiliary winding is a PCB; the secondary winding is formed by connecting two special-shaped stamping copper foils in parallel through a T-shaped guide pin, the primary winding is arranged on the secondary winding, and the magnetic core is arranged at the outer edges of the primary winding and the secondary winding.
2. A low-voltage high-current-output switching power supply high-frequency transformer according to claim 1, characterized in that: the primary winding is made of two double-layer PCBs and is connected with a center tap through a T-shaped guide pin.
3. A low-voltage high-current-output switching power supply high-frequency transformer according to claim 1, characterized in that: the primary auxiliary winding is completed by a double-layer PCB.
4. A low-voltage large-current-output switching power supply high-frequency transformer according to claim 1 or 3, characterized in that: the thickness of the special-shaped stamping copper foil is 0.3 mm.
5. A low-voltage high-current-output switching power supply high-frequency transformer according to claim 1, characterized in that: and the secondary winding forms patch installation through a T-shaped guide pin.
6. A low-voltage high-current-output switching power supply high-frequency transformer according to claim 1, characterized in that: and an insulating gasket is arranged between the primary winding and the secondary winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023346761.2U CN214797050U (en) | 2020-12-31 | 2020-12-31 | Low-voltage large-current output high-frequency transformer for switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023346761.2U CN214797050U (en) | 2020-12-31 | 2020-12-31 | Low-voltage large-current output high-frequency transformer for switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214797050U true CN214797050U (en) | 2021-11-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023346761.2U Active CN214797050U (en) | 2020-12-31 | 2020-12-31 | Low-voltage large-current output high-frequency transformer for switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214797050U (en) |
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2020
- 2020-12-31 CN CN202023346761.2U patent/CN214797050U/en active Active
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