CN111614233A

CN111614233A - Double-input LLC resonance half-bridge circuit type planar transformer with current-equalizing and voltage-equalizing inductors

Info

Publication number: CN111614233A
Application number: CN202010576386.6A
Authority: CN
Inventors: 魏彪; 高立松
Original assignee: Qingdao Jierui Kangda Electronics Co ltd
Current assignee: Qingdao Jierui Kangda Electronics Co ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2020-09-01

Abstract

The invention discloses a double-input LLC resonance half-bridge circuit type planar transformer with a current-sharing and voltage-sharing inductor, which comprises an insulating bottom plate, a left transformer, a right transformer, a left resonance inductor, a right resonance inductor and a nanocrystalline magnetic ring, wherein the left transformer and the right transformer are vertically arranged on the rear side of the upper end surface of the insulating bottom plate; a nanocrystalline magnetic ring is vertically arranged between the left resonant inductor and the right resonant inductor at the front sides of the left transformer and the right transformer; the left and right transformers make the leakage inductance of the left and right transformers and the inductance of the left and right resonant inductors meet the specified requirements by adjusting the air gap of the center pillar of the magnetic core, the requirements of the resonant circuit of the soft switching power supply are met, and the primary integrated transverse magnetic nanocrystalline current-equalizing and voltage-equalizing inductors of the two transformers are used for equalizing the current. The invention has the advantages of high frequency, high power, high reliability and high integration degree of the high-power switching power supply, has adjustable output voltage, and meets the development trend of the direct-current power supply with high switching frequency, low loss, high power, modularization, high integration and low cost.

Description

Double-input LLC resonance half-bridge circuit type planar transformer with current-equalizing and voltage-equalizing inductors

The technical field is as follows:

the invention relates to the field of transformers, in particular to a double-input LLC resonance half-bridge circuit type planar transformer with a current-sharing and voltage-sharing inductor.

Background art:

the traditional transformer is generally wound by enameled wires, the winding form is relatively more in manual participation, the winding process is complex, the wires need to be thick and difficult to operate when low-voltage and large-current are met, leakage inductance and distributed capacitance of the transformer are difficult to control batch consistency, installation volume and temperature rise limitation, so that great difficulty is brought to actual batch debugging of high-power direct-current sources, and in addition, the structure of the traditional transformer is not favorable for heat dissipation, so that the development trend of high frequency, low loss, high power density and modularization is difficult to realize.

The conventional product is generally a full-bridge or half-bridge circuit, and is not an LLC resonant circuit, and the conventional full-bridge or half-bridge circuit generally works at a fixed frequency, and the output voltage is a fixed value.

With electronic circuits, high-power switching power supplies develop to high frequency, high power, high reliability and high integration, and output voltage is adjustable, which puts higher demands on direct-current power supplies. High switching frequency, low loss, high power, modularization, high integration, and low cost are the development trends of dc power supplies.

The LLC is higher for resonant frequency conversion circuit efficiency, has that software control voltage is adjustable, and input voltage is two ways, uses two under the condition that does not change power standard joint can power double, removes the trouble of customization high-power plug from, because have the voltage-sharing inductance that flow equalizes can satisfy two way inputs, can be different electric wire netting, and the voltage difference also can normally work in time.

To sum up, in order to satisfy above to with high power direct current switching power supply requirement that can be better, adopt the mode of LLC resonance half-bridge circuit, for the convenience make the volume of whole power do littleer, the height is lower.

The invention content is as follows:

in order to overcome the defects of the prior art, the invention aims to provide a double-input LLC resonance half-bridge circuit type planar transformer with a current-sharing and voltage-sharing inductor, which effectively solves the development trend that a high-power switching power supply develops towards high frequency, high power, high reliability and high integration, has adjustable output voltage, high switching frequency, low loss, high power, modularization, high integration and low cost and is a direct-current power supply.

The transformer inductors are all vertically arranged, so that the occupied area of the PCB is less, the volume of the whole power supply is smaller, and the height and the space are reasonably utilized; the transformer has no framework winding fingers, and the primary and secondary are tightly combined, so that the leakage inductance of the transformer can be very low, the consistency is good, the efficiency is very high, and the temperature rise is very low.

The technical scheme of the invention is as follows:

double input area voltage-sharing inductance LLC resonance half-bridge circuit type planar transformer that flow equalizes, its characterized in that: the transformer comprises an insulating bottom plate, a left transformer, a right transformer, a left resonance inductor, a right resonance inductor and a nanocrystalline magnetic ring, wherein the left transformer and the right transformer are vertically arranged on the rear side of the upper end surface of the insulating bottom plate; a left resonant inductor and a right resonant inductor are respectively vertically arranged on the front sides of the left transformer and the right transformer, and a nanocrystalline magnetic ring is vertically arranged between the left resonant inductor and the right resonant inductor;

the left transformer and the right transformer enable the leakage inductance of the left transformer and the right transformer and the inductance of the left resonant inductor and the right resonant inductor to meet the specified requirements by adjusting the air gap of the center pillar of the magnetic core, the requirements of a soft switching power supply resonant circuit are met, and the two transformers are primarily integrated with the transverse magnetic nanocrystal current-equalizing and voltage-equalizing inductance.

The double-input LLC resonance half-bridge circuit type planar transformer with the current-equalizing voltage-sharing inductor is characterized in that: the left transformer and the right transformer are formed by butting a PQI50 type ferrite soft magnetic core and an I type ferrite soft magnetic core, the butting surfaces of the magnetic cores are bonded and fixed by high-temperature bonding glue, and the magnetic cores and the winding are bonded and fixed by bonding glue.

The double-input LLC resonance half-bridge circuit type planar transformer with the current-equalizing voltage-sharing inductor is characterized in that: the left transformer and the right transformer have the same structure, each transformer winding is wound on a center post of the PQI50 type magnetic core, the primary windings of the two transformers are divided into two parts which are connected in parallel, and the secondary windings are divided into three parts which are connected in parallel; the finger winding structure is a secondary structure; a primary stage; a second stage; a primary stage; and (4) performing secondary treatment.

The primary winding is made of litz wires or multi-strand three-layer insulated wires, the secondary winding is made of insulating film-coated copper foils or enameled flat copper wires, the flying wires of the primary wire at the leading-out end are led out, and the secondary copper foils or enameled flat copper wires are directly led out.

The double-input LLC resonance half-bridge circuit type planar transformer with the current-equalizing voltage-sharing inductor is characterized in that: the primary flying wires of the left transformer and the right transformer are wound on the nanocrystalline magnetic ring with the protective shell, and the primary leads of the left transformer and the right transformer are sleeved with the insulating sleeves.

The double-input LLC resonance half-bridge circuit type planar transformer with the current-equalizing voltage-sharing inductor is characterized in that: the left resonant inductor and the right resonant inductor are formed by butting two soft magnetic cores of PQ32 type ferrite, the butting surfaces of the magnetic cores are bonded and fixed by high-temperature bonding glue, and the winding and the magnetic cores are bonded and fixed by the bonding glue.

The double-input LLC resonance half-bridge circuit type planar transformer with the current-equalizing voltage-sharing inductor is characterized in that: and the insulating base plate is provided with a framework corresponding to the positions of the left resonant inductor and the right resonant inductor, the left resonant inductor and the right resonant inductor are wound on the corresponding framework, and the two PQ32 type magnetic cores are assembled in a butt joint mode.

The double-input LLC resonance half-bridge circuit type planar transformer with the current-equalizing voltage-sharing inductor is characterized in that: the left resonant inductor and the right resonant inductor are made of multi-strand three-layer insulated wires and coated copper foils meeting the skin depth requirement.

The double-input LLC resonance half-bridge circuit type planar transformer with the current-equalizing voltage-sharing inductor is characterized in that: the left transformer, the right transformer and the insulating bottom plate are fixed through high-temperature bonding glue, the pin positions of the left transformer and the right transformer can be fixed and corrected, and plug-in welding work of a power supply PCB is facilitated.

The invention has the advantages that:

1. in order to better meet the requirement of using a high-power direct-current switching power supply, an LLC resonance half-bridge circuit mode is adopted, a transformer, a resonance sensor and a planar transformer integrating current-equalizing and voltage-equalizing are adopted, two paths of transformers are integrated with a primary transverse magnetic nanocrystal current-equalizing and voltage-equalizing inductor, and two paths of power can be guaranteed to be equal even if two power grids are different in time;

2. according to the invention, the copper foil winding stamped by the grinding tool is adopted as the secondary winding to replace the winding with a complex process, the copper foil has better carrying and flowing capacity and higher efficiency, and finally, the transformer is produced by adopting an assembly mode, so that the artificial factors are fewer;

3. the transformer and the inductor are vertically arranged and integrated into a whole in 5 devices, so that the occupied area of a PCB is smaller, the power supply is more convenient to arrange, the volume of the whole power supply is smaller, and the power density is higher;

4. all the devices are integrated to enable the PCB of the power supply to be better distributed, the resonant inductor is externally arranged, the appropriate inductance is easy to adjust, the resonant circuit is matched to work normally, the resonant inductor is adjustable, the circuit is better designed and produced, artificial factors are few, the product consistency is better, all the materials are environment-friendly materials, and the environment is not polluted.

Description of the drawings:

fig. 1 is a front view of the present invention.

Fig. 2 is a rear view of the present invention.

Fig. 3 is a right side view of the present invention.

Fig. 4 is a bottom view of the present invention.

Fig. 5 is a front view of the PQI50 type ferrite soft magnetic core of the left and right transformers of the present invention.

Fig. 6 is a front view of the PQI50 type ferrite soft magnetic core of the left and right transformers of the present invention.

FIG. 7 is a soft magnetic front view of the PQ32 type ferrite of the left and right resonant inductors of the present invention.

FIG. 8 is a soft magnetic front view of the PQ32 type ferrite of the left and right resonant inductors of the present invention.

FIG. 9 is a diagram of a nanocrystalline magnetic ring of the present invention.

Fig. 10 is a skeleton diagram for assembling the positions of the left and right resonant inductors according to the present invention.

Fig. 11 is a diagram of secondary windings of the left and right transformers of the present invention.

FIG. 12 is an insulating film diagram of the present invention.

Fig. 13 is a front view of the insulating base plate of the present invention.

Fig. 14 is a bottom view of the insulating base plate of the present invention.

Fig. 15 is a right side view of the insulating base plate of the present invention.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The double-input LLC resonance half-bridge circuit type planar transformer with the current-sharing and voltage-sharing inductance comprises an insulating bottom plate 1, a left transformer 2, a right transformer 3, a left resonance inductor 4, a right resonance inductor 5 and a nanocrystalline magnetic ring 6, wherein the left transformer 2 and the right transformer 3 are vertically arranged on the rear side of the upper end surface of the insulating bottom plate 1; a left resonant inductor 4 and a right resonant inductor 5 are respectively vertically arranged on the front sides of the left transformer 2 and the right transformer 3, and a nanocrystalline magnetic ring 6 is vertically arranged between the left resonant inductor 4 and the right resonant inductor 5;

the left transformer 2 and the right transformer 32 enable the leakage inductance of the left transformer 2 and the right transformer 3 and the inductance of the left resonant inductor 4 and the right resonant inductor 5 to meet the specified requirements by adjusting the air gaps of the center pillars of the magnetic cores, the requirements of a soft switching power supply resonant circuit are met, the primary integrated transverse magnetic nanocrystalline current-equalizing and voltage-equalizing inductance of the two transformers is timely, two power grids are different, and the two power grids can be guaranteed to be equal.

The left transformer 2 and the right transformer 3 are formed by butting a PQI50 type ferrite soft magnetic core and an I type ferrite soft magnetic core, the butting surfaces of the magnetic cores are bonded and fixed by high-temperature bonding glue, and the magnetic cores and the winding are bonded and fixed by bonding glue.

The left transformer 2 and the right transformer 3 have the same structure, each transformer winding is wound on a center post of a PQI50 type magnetic core, two primary windings 7 of the transformers are divided into two parts which are connected in parallel, and a secondary winding 8 is divided into three parts which are connected in parallel; the finger winding structure is a secondary structure; a primary stage; a second stage; a primary stage; and (4) performing secondary treatment.

The primary winding 7 is made of litz wires or multi-strand three-layer insulated wires, the secondary winding 8 is made of copper foils covered with insulating films or enameled flat copper wires, the flying wires of the primary wires at the leading-out ends are led out, the layout of a PCB (printed circuit board) of a client is facilitated, and the secondary copper foils or the enameled flat copper wires are directly led out.

Primary flying wires of the left transformer 2 and the right transformer 3 are wound on a nanocrystalline magnetic ring with a protective shell, and primary leads of the left transformer 2 and the right transformer 3 are sleeved with insulating sleeves.

The left resonant inductor 4 and the right resonant inductor 5 are formed by butting two PQ32 type ferrite soft magnetic cores, the butting surfaces of the magnetic cores are bonded and fixed by high-temperature bonding glue, and the winding and the magnetic cores are bonded and fixed by the bonding glue.

And a framework 9 corresponding to the positions of the left resonant inductor 4 and the right resonant inductor 5 is arranged on the insulating base plate 1, windings of the left resonant inductor 4 and the right resonant inductor 5 are wound on the corresponding framework 9, and the two PQ32 type magnetic cores are assembled in a butt joint mode.

The windings of the left resonant inductor 4 and the right resonant inductor 5 are made of multi-strand three-layer insulated wires and coated copper foils meeting the skin depth requirement.

The left transformer 2, the right transformer 3 and the insulating bottom plate 1 are fixed by high-temperature adhesive glue, the pin positions of the left transformer and the right transformer can be fixed and corrected, the plug-in welding work of a power supply PCB is facilitated, primary flying wires of the left transformer 2 and the right transformer 3 are wound on the nanocrystalline magnetic ring 6 with the protective shell, the safety regulation requirements are met, and the PCB area is not occupied.

The magnetic cores of the transformer (the left transformer 2, the right transformer 3) and the inductor (the left resonance inductor 4 and the right resonance inductor 5) are ferrite soft magnetic cores, the magnetic cores of the transformer (the left resonance inductor 4 and the right resonance inductor 5) are formed by butting PQ50 type magnetic cores and I type magnetic cores, the inductor (the left resonance inductor 4 and the right resonance inductor 5) is formed by butting PQ32 type magnetic cores, and the magnetic cores are made of low-loss power ferrite magnetic cores capable of working at 20KHz-1MHz so as to meet the requirement of a high-power supply at 20KHz-500 KHz.

The primary winding and the secondary winding of the transformer (the left transformer 2 and the right transformer 3) and the winding of the inductor (the left resonance inductor 4 and the right resonance inductor 5) adopt multi-strand three-layer insulated wires and coated copper foils which meet the skin depth requirement, so that the problem that the effective resistance of the winding is increased due to the skin effect and the temperature rise of the winding is increased due to the increase of the frequency can be avoided, the winding can realize high current density under the same temperature rise, and the high-current-density high-frequency-resistant transformer can be suitable for higher working frequency.

The secondary sides of the transformers (the left transformer 2 and the right transformer 3) are installed in a mode of directly leading out the body, so that the current carrying capacity of the transformers can be ensured; meanwhile, the process of welding the guide pin is omitted, and the mass production is facilitated.

In order to make the volume of the whole power supply smaller and make the power density higher, the invention adopts the vertical arrangement of 5 devices in total, namely a transformer (a left transformer 2, a right transformer 3), an inductor (a left resonance inductor 4, a right resonance inductor 5) and a nanocrystalline magnetic ring 6, and adopts an integrated form, so that the occupied area of a PCB is smaller, and the power supply is more convenient to arrange.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or that certain features may be substituted for those skilled in the art, and all changes, equivalents, and improvements that fall within the spirit and scope of the invention are therefore intended to be embraced by the appended claims.

Claims

1. The utility model provides a double input area voltage-sharing inductance LLC resonance half-bridge circuit type planar transformer that flow equalizes which characterized in that: the transformer comprises an insulating bottom plate, a left transformer, a right transformer, a left resonance inductor, a right resonance inductor and a nanocrystalline magnetic ring, wherein the left transformer and the right transformer are vertically arranged on the rear side of the upper end surface of the insulating bottom plate; a left resonant inductor and a right resonant inductor are respectively vertically arranged on the front sides of the left transformer and the right transformer, and a nanocrystalline magnetic ring is vertically arranged between the left resonant inductor and the right resonant inductor;

2. The dual-input LLC resonance half-bridge circuit type planar transformer with current-sharing and voltage-sharing inductors according to claim 1, characterized in that: the left transformer and the right transformer are formed by butting a PQI50 type ferrite soft magnetic core and an I type ferrite soft magnetic core, the butting surfaces of the magnetic cores are bonded and fixed by high-temperature bonding glue, and the magnetic cores and the winding are bonded and fixed by bonding glue.

3. The dual-input LLC resonant half-bridge circuit type planar transformer with current-sharing and voltage-sharing inductors according to claim 2, wherein: the left transformer and the right transformer have the same structure, each transformer winding is wound on a center post of the PQI50 type magnetic core, the primary windings of the two transformers are divided into two parts which are connected in parallel, and the secondary windings are divided into three parts which are connected in parallel; the finger winding structure is a secondary structure; a primary stage; a second stage; a primary stage; and (4) performing secondary treatment.

4. The dual-input LLC resonance half-bridge circuit type planar transformer with current-sharing and voltage-sharing inductors according to claim 1, characterized in that: the primary flying wires of the left transformer and the right transformer are wound on the nanocrystalline magnetic ring with the protective shell, and the primary leads of the left transformer and the right transformer are sleeved with the insulating sleeves.

5. The dual-input LLC resonance half-bridge circuit type planar transformer with current-sharing and voltage-sharing inductors according to claim 1, characterized in that: the left resonant inductor and the right resonant inductor are formed by butting two soft magnetic cores of PQ32 type ferrite, the butting surfaces of the magnetic cores are bonded and fixed by high-temperature bonding glue, and the winding and the magnetic cores are bonded and fixed by the bonding glue.

6. The dual-input LLC resonance half-bridge circuit type planar transformer with current-sharing and voltage-sharing inductors according to claim 1, characterized in that: and the insulating base plate is provided with a framework corresponding to the positions of the left resonant inductor and the right resonant inductor, the left resonant inductor and the right resonant inductor are wound on the corresponding framework, and the two PQ32 type magnetic cores are assembled in a butt joint mode.

7. The dual-input LLC resonance half-bridge circuit type planar transformer with current-sharing and voltage-sharing inductors according to claim 1, characterized in that: the left resonant inductor and the right resonant inductor are made of multi-strand three-layer insulated wires and coated copper foils meeting the skin depth requirement.

8. The dual-input LLC resonance half-bridge circuit type planar transformer with current-sharing and voltage-sharing inductors according to claim 1, characterized in that: the left transformer, the right transformer and the insulating bottom plate are fixed through high-temperature bonding glue, the pin positions of the left transformer and the right transformer can be fixed and corrected, and plug-in welding work of a power supply PCB is facilitated.