CN218513288U - Planar transformer, planar composite coil thereof and auxiliary voltage generating circuit - Google Patents
Planar transformer, planar composite coil thereof and auxiliary voltage generating circuit Download PDFInfo
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- CN218513288U CN218513288U CN202222519367.7U CN202222519367U CN218513288U CN 218513288 U CN218513288 U CN 218513288U CN 202222519367 U CN202222519367 U CN 202222519367U CN 218513288 U CN218513288 U CN 218513288U
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Abstract
The utility model discloses a planar transformer, its planar composite coil and auxiliary voltage generate circuit, this planar composite coil include the base plate, still include outer coil and interior coil, outer coil and interior coil set up in on the base plate, interior coil is located the inboard of outer coil, the outer coil includes first outer coil end and second outer coil end, the interior coil includes first interior coil end and second interior coil end, certainly first outer coil end constitutes to the many circles conducting layer of the interior coiling of second outer coil end the outer coil, certainly first interior coil end constitutes to the many circles conducting layer of the interior coiling of second interior coil end the inner coil, first outer coil end is used for ground connection, the second interior coil end is through first via hole ground connection, first coil end is used for exporting first voltage through the second via hole.
Description
Technical Field
The utility model relates to a planar transformer, concretely relates to planar transformer, its plane composite coil and auxiliary voltage produce the circuit.
Background
At present, AC-DC (alternating current-direct current) circuits including transformers are widely used in switching power supplies in various electronic devices, and as the size of the electronic devices becomes smaller, more and more AC-DC circuits employ planar transformers. The structural layout of the planar coils in a common planar transformer is not reasonable.
SUMMERY OF THE UTILITY MODEL
Based on above-mentioned current situation, the utility model discloses a main aim at provides planar transformer, its plane composite coil to a plane composite coil that structural layout is more reasonable is provided.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a plane composite coil of planar transformer, includes the base plate, still includes outer coil and interior coil, outer coil and interior coil set up in on the base plate, the interior coil is located the inboard of outer coil, the outer coil includes first outer coil end and second outer coil end, the interior coil includes first interior coil end and second interior coil end, certainly first outer coil end constitutes to the many coils conducting layer of second outer coil end inside coiling the outer coil, certainly first interior coil end constitutes to the many coils conducting layer of second interior coil end inside coiling the interior coil, first outer coil end is used for ground connection, second outer coil end is through first via hole ground connection, first interior coil end is used for exporting first voltage through the second via hole.
Preferably, the outer coil comprises a plurality of outer arc sections and a plurality of outer non-arc sections, the radian of each outer arc section exceeds 270 degrees, and two adjacent outer arc sections are connected through one outer non-arc section; the inner coil comprises a plurality of inner circular arc sections and a plurality of inner non-circular arc sections, the radian of each inner circular arc section exceeds 270 degrees, and two adjacent inner circular arc sections are connected through one inner non-circular arc section.
Preferably, the innermost non-circular arc segment in the inner coil comprises an innermost shielding segment, the width of the innermost shielding segment gradually decreases from a position close to the inner side of the planar composite coil to the second inner coil end, and the width of the innermost shielding segment is greater than the width of all the inner circular arc segments.
Preferably, the inner non-circular arc section of the inner coil on the inner secondary side includes a secondary inner shielding section, the width of the secondary inner shielding section gradually increases from the contact position connected with the inner circular arc section on the innermost side to the position far away from the contact position, and the width of the secondary inner shielding section is greater than the width of all the inner circular arc sections.
Preferably, the substrate is further provided with a third via hole, the third via hole is arranged at a position close to the innermost shielding section and the secondary inner shielding section, and the innermost shielding section and the secondary inner shielding section surround the third via hole together in a semi-surrounding mode.
The utility model also provides a planar transformer, including primary main coil, primary auxiliary coil, magnetic core and secondary coil, primary main coil, primary auxiliary coil and secondary coil pass through the magnetic core forms the magnetic coupling, primary auxiliary coil adopts arbitrary the compound coil of plane.
Produce auxiliary voltage for make full use of transformer to provide voltage to the back stage circuit, the utility model also provides an auxiliary voltage of transformer produces the circuit, including the transformer, the transformer adopts planar transformer.
Preferably, the auxiliary voltage generating circuit further includes a first diode, a second diode, a first capacitor, a second capacitor, a clamping circuit, a resistor, and a switching tube, the transformer is not the planar transformer, the transformer includes a primary coil, a primary auxiliary coil, and a magnetic core, the primary coil and the primary auxiliary coil form a magnetic coupling through the magnetic core, the primary auxiliary coil includes a positive high-voltage end and a positive low-voltage end, and a difference between a positive high-voltage output by the positive high-voltage end and a positive low-voltage output by the positive low-voltage end is greater than a turn-on threshold voltage of the switching tube; the cathode of the first diode is connected with the current outflow end of the switching tube, and the anode of the first diode is connected with the positive low-voltage end; the cathode of the second diode is connected with the current inflow end of the switching tube, and the anode of the second diode is connected with the positive high-voltage end; the current inflow end of the switching tube is grounded through the first capacitor; the current outflow end of the switching tube is used as a power supply end of a rear-stage circuit, and the power supply end is grounded through the second capacitor; the cathode of the second diode is connected with the control end of the switching tube through the resistor; when the voltages of the positive high-voltage end and the positive low-voltage end are both greater than the clamping threshold voltage of the clamping circuit, the clamping circuit clamps the voltage of the control end of the switch tube at the clamping threshold voltage, the switch tube is turned off, and the positive low-voltage end supplies power to the power supply end through the first diode; when the voltage of the positive high-voltage end is smaller than the clamping threshold voltage of the clamping voltage, the clamping circuit cannot clamp, the switch tube is conducted, the positive high-voltage end supplies power to the power supply end through the second diode and the switch tube, and the positive low-voltage end supplies power to the power supply end through the first diode.
Preferably, the auxiliary voltage generating circuit further comprises a third diode and an inductor, and the primary auxiliary winding comprises a ground terminal and a negative voltage terminal; the grounding end is grounded, the cathode of the third diode is connected with the current inflow end of the switching tube through the inductor, and the anode of the third diode is connected with the negative voltage end; when the voltage of the positive high-voltage end is smaller than the clamping threshold voltage of the clamping voltage, in the stage of magnetizing the primary main coil, the positive high-voltage end and the positive low-voltage end stop supplying power to the power supply end, and the negative voltage end supplies power to the power supply end through the third diode, the inductor and the switching tube.
Preferably, the clamping circuit is a voltage stabilizing diode, and a cathode of the voltage stabilizing diode is connected with a control end of the switching tube, and an anode of the voltage stabilizing diode is grounded.
[ PROBLEMS ] the present invention
The utility model discloses an in some schemes, the inner coil is located the inboard of outer coil, constitute the outer coil from first outer coil end to the inside many circles conducting layer of coiling of second outer coil end, constitute the inner coil from the inside many circles conducting layer of coiling of first inner coil end to second inner coil end, first outer coil end is used for ground connection, the second inner coil end is through first via hole ground connection, first inner coil end is used for exporting first voltage through the second via hole, the overall arrangement of this kind of plane composite coil is more reasonable, more do benefit to from this plane composite coil leading-out terminal, and with the intercommunication between the all the other layers of planar transformer.
In other schemes of the utility model, when the voltage of the positive high-voltage end and the positive low-voltage end are both greater than the clamping threshold voltage of the clamping circuit, the clamping circuit clamps the voltage of the control end of the switch tube at the clamping threshold voltage, the switch tube is turned off, the positive low-voltage end supplies power to the power supply end through the first diode, the power supply from the positive high-voltage end to the power supply end is avoided, and thus the control chip is prevented from being damaged by the overhigh voltage; when the voltage of the positive high-voltage end is smaller than the clamping threshold voltage of the clamping voltage, the clamping circuit cannot clamp, the switching tube is conducted, the positive high-voltage end supplies power to the power supply end through the second diode and the switching tube, the positive low-voltage end supplies power to the power supply end through the first diode, and the electric energy provided by the two paths can ensure that the control chip obtains enough electric energy as far as possible. In addition, compared with the existing scheme that the auxiliary voltage is directly obtained from the bus through the voltage reduction circuit, the circuit is smaller in volume and power consumption.
Other beneficial effects of the utility model will be elucidated through the introduction of specific technical characteristics and technical scheme in the detailed description, and through the introduction of these technical characteristics and technical scheme, the skilled person in the art can understand the beneficial technical effect that technical characteristics and technical scheme brought.
Drawings
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure:
fig. 1 is a circuit diagram of an ac-dc conversion circuit according to a preferred embodiment of the present invention;
fig. 2 is a circuit diagram of an ac-dc converter circuit according to another preferred embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a planar transformer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a primary auxiliary coil according to an embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the spirit of the present invention, well-known methods, procedures, flows, and components have not been described in detail.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Fig. 1 is an ac-dc conversion circuit according to an embodiment of the present invention, which includes a rectifier circuit, a bus capacitor C0, a dc-dc conversion unit, and an auxiliary voltage generating circuit.
The input end of the rectifying circuit is used for being connected with an alternating current power grid to input alternating current voltage, one output end of the rectifying circuit is connected with a bus, the other output end of the rectifying circuit is grounded, a bus capacitor is bridged between the bus and the ground, and the rectifying circuit is used for rectifying the input alternating current voltage to obtain direct current voltage and supplying the direct current voltage to the bus. The rectifying circuit may be a full-bridge rectifying circuit or a half-bridge rectifying circuit.
The input end of the direct current-direct current conversion unit inputs the voltage on the bus, the direct current-direct current conversion unit is used for converting the voltage on the bus into output target voltage, the target voltage can be set according to proper requirements, and for common consumer electronics, 5V, 12V, 24V and the like are common target voltages.
As shown in fig. 2, the dc-dc conversion of the embodiment of the present invention includes a control chip, a power switch Q, a transformer T and a secondary output circuit, the secondary output circuit includes a rectifier diode D4 and a filter capacitor EC1, the transformer T includes a primary main coil, a primary auxiliary coil, a secondary coil and a magnetic core, and the three types of the primary main coil, the primary auxiliary coil and the secondary coil form a magnetic coupling through the magnetic core each other. The power supply voltage VCC of the control chip is generated by an auxiliary voltage generating circuit, and the voltage on the bus is converted into a target voltage output by the secondary output circuit under the control of the control chip. The first end of the primary main coil is connected with the bus, the second end of the primary main coil is grounded through the power switch tube Q, the first end of the secondary coil is connected with the anode of the rectifier diode D4, the cathode of the rectifier diode D4 is connected with the anode of the filter capacitor EC1, the cathode of the filter capacitor EC1 is grounded, the second end of the secondary coil is grounded, the cathode end of the rectifier diode D4 is used as the output end of the DC-DC conversion unit, namely the output end of the AC-DC conversion circuit, the output end outputs a target voltage V0, and the control chip can stabilize the voltage of the output end on the set target voltage V0 by adjusting the duty ratio of a control signal PWM of the power switch tube Q. In this embodiment, the power supply voltage VCC within a certain range can enable the control chip to work normally.
The auxiliary voltage generating circuit comprises the transformer T, and further comprises a first diode D1, a second diode D2, a first capacitor C1, a second capacitor C2, a clamping circuit, a resistor R1 and a switch tube Q1 (which can be a field effect tube or a bipolar transistor), the primary auxiliary coil comprises a positive high-voltage end P3 and a positive low-voltage end P2, and the difference between the positive high voltage output by the positive high-voltage end P3 and the positive low voltage output by the positive low-voltage end P2 is greater than the conduction threshold voltage of the switch tube Q1; the cathode of the first diode D1 is connected with the current outflow end of the switching tube Q1, and the anode of the first diode D1 is connected with the positive low-voltage end P2; the cathode of the second diode D2 is connected with the current inflow end of the switching tube Q1, and the anode of the second diode D2 is connected with the positive high-voltage end P3; the current inflow end of the switching tube Q1 is grounded through a first capacitor C1; the current outflow end of the switching tube Q1 is used as a power supply end of a post-stage circuit, and the power supply end is grounded through a second capacitor C2; the cathode of the second diode D2 is connected with the control end of the switching tube Q1 through the resistor R1; the clamping circuit is used for clamping or not clamping the control end of the switching tube Q1. When the voltages of the positive high-voltage end P3 and the positive low-voltage end P2 are both greater than the clamping threshold voltage of the clamping circuit, the clamping circuit clamps the voltage of the control end of the switching tube Q1 at the clamping threshold voltage, the switching tube Q1 is turned off, and the positive low-voltage end P2 supplies power to the power supply end through the first diode D1; when the voltage of the positive high-voltage end P3 is less than the clamping threshold voltage of the clamping voltage, the switching tube Q1 is turned on, the positive high-voltage end P3 supplies power to the power supply end via the second diode D2 and the switching tube Q1, and the positive low-voltage end P2 supplies power to the power supply end via the first diode D1. In some embodiments, the clamping circuit is a zener diode ZD1, and a cathode of the zener diode ZD1 is connected to the control terminal of the switching tube Q1, and an anode thereof is grounded.
When the power switch Q is turned on, the primary main coil starts to be charged and stored with energy, the electromotive force generated by the first end of the secondary coil (the terminal connected to the anode of the rectifier diode D4 in fig. 2) is a negative voltage, and the electromotive forces generated by the positive high-voltage end P3 (the terminal connected to the anode of the second diode D2 in fig. 2) and the positive low-voltage end P2 (the terminal connected to the anode of the first diode D1 in fig. 2) of the primary auxiliary coil are a negative voltage; when the power switch tube Q is turned off, the primary main coil starts to release magnetic energy, and electromotive forces generated by the first end of the secondary coil and the positive high-voltage end P3 and the positive low-voltage end P2 of the primary auxiliary coil are positive voltages.
As shown in fig. 2, in the case of using a certain point of the primary auxiliary coil as a reference point, by setting the number of turns of the coil between the positive high voltage terminal P3 and the reference point to be greater than the number of turns of the coil between the positive low voltage terminal P2 and the reference point, the absolute value of the electromotive force output from the positive high voltage terminal P3 can be made greater than the absolute value of the electromotive force output from the positive low voltage terminal P2, and when both output positive electromotive forces, it can be ensured that the positive high voltage V output from the positive high voltage terminal P3 is the positive voltage V h+ Positive low voltage V greater than positive low voltage end output l+ . When the first end of the secondary coil outputs positive electromotive force, the voltage of the first end of the secondary coil is clamped by the rectifier diode D4Clamping to be approximately equal to the output target voltage V0, and obtaining the positive high voltage V according to the number of turns (Np 3+ Np 2) of the positive high voltage end P3, the number of turns Np2 of the positive low voltage end P2 and the number of turns Ns of the secondary coil h+ And a positive low voltage V l+ Relationships with the target voltage V0, respectively:
V h+ ＝V0*(Np3+Np2)/Ns；
V l+ ＝V0*Np2/Ns。
from this, it can be seen that the higher the target voltage V0 is, the higher the positive voltage V is h+ The larger, the positive low voltage V l+ Also larger, but positive high voltage V h+ The amplitude of the increase is larger, in the auxiliary voltage generating circuit, in the stage that the primary main coil starts to release magnetic energy (at this moment, positive high-voltage end P3 and positive low-voltage end P2 both output positive voltage), when target voltage V0 exceeds a certain value, at this moment, the voltages of positive high-voltage end P3 and positive low-voltage end P2 are both greater than the clamping threshold voltage of the clamping circuit, the clamping circuit plays a clamping role, thereby causing switch tube Q1 to be disconnected, the positive low-voltage end P2 outputting lower positive voltage supplies power to the power supply end via first diode D1 (second capacitor C2 can play a role in stabilizing the voltage of the power supply end), avoid positive high-voltage end P3 supplying power to the power supply end, thereby preventing the control chip from being damaged by too high voltage. When the target voltage V0 is less than a certain value, the voltage of the positive high-voltage end P3 is less than the clamping threshold voltage of the clamping voltage, the clamping circuit does not clamp, and the positive high-voltage V loaded on the control end of the switching tube Q1 h+ And a positive low voltage V l+ The difference is greater than the conduction threshold voltage of the switching tube Q1, so that the switching tube Q1 is conducted, the positive high-voltage end P3 supplies power to the power supply end through the second diode D2 and the switching tube Q1, the positive low-voltage end P2 supplies power to the power supply end through the first diode D1, the electric energy provided by the two paths can ensure that the control chip obtains enough electric energy as far as possible, and the first capacitor C1 can play a role in stabilizing the current inflow end voltage of the switching tube Q1. In one embodiment, if Np3= Np2= Ns, then V h+ ＝2V0，V l+ = V0. In the stage of magnetizing and storing energy of the primary main coil, the positive high-voltage end P3 and the positive low-voltage end P2 both output negative voltage at the moment, and the positive high-voltage end P3 and the positive low-voltage end P2 stop supplying electric energy to the power supply end.
In some embodiments, in order to further ensure that the power obtained by the power supply terminal is more sufficient when the target voltage V0 is lower, the power may also be provided to the power supply terminal during the stage of the primary main coil charging and storing energy, the following technical solutions are adopted in this embodiment: the auxiliary voltage generating circuit further comprises a third diode D3 and an inductor L, and the primary auxiliary coil comprises a ground terminal P0 and a negative voltage terminal P1 (the number of corresponding coil turns is Np 1); the grounding end P0 is grounded, the cathode of the third diode D3 is connected with the current inflow end of the switching tube Q1 through the inductor L, and the anode is connected with the negative voltage end P1; when the voltage of the positive high-voltage end P3 is smaller than the clamping threshold voltage of the clamping voltage, in the stage of primary main coil magnetization, the positive high-voltage end P3 and the positive low-voltage end P2 stop supplying power to the power supply end, and the negative voltage end P1 supplies power to the power supply end through the third diode D3, the inductor L and the switching tube Q1. In this embodiment, the ground terminal P0 may be used as the above-mentioned reference point of the primary auxiliary coil, that is, the number of turns (Np 3+ Np 2) of the positive high voltage terminal P3 and the number of turns Np2 of the positive low voltage terminal P2 are both the number of turns using the ground terminal P0 as the reference point.
In some embodiments, the transformer T may be a planar transformer, and the primary auxiliary winding may be a planar composite winding in the planar transformer. As shown in fig. 3, the primary coil and the primary auxiliary coil of the planar transformer are respectively located in different middle layers, wherein the secondary coil is distributed in the uppermost layer and the lowermost layer, the communication between the different layers can be realized by passing through the via holes in the respective layers, the planar transformer can further include a conductive layer to realize the electrical connection between the coils of the different layers and the electrical connection of the related circuit devices, these conductive layers and via holes are not shown in fig. 3, and those skilled in the art can realize the connection according to the teachings of the present invention. As shown in fig. 4, a planar composite coil 10 of a planar transformer includes a substrate 100, an outer coil 200 and an inner coil 300, the outer coil 200 and the inner coil 300 are disposed on the substrate 100, the inner coil 300 is disposed inside the outer coil 200, the outer coil 200 includes a first outer coil end 210 and a second outer coil end 220, the inner coil 300 includes a first inner coil end 310 and a second inner coil end 320, a plurality of conductive layers inward wound from the first outer coil end 210 to the second outer coil end 220 form the outer coil 200, a plurality of conductive layers inward wound from the first inner coil end 310 to the second inner coil end 320 form the inner coil 300, the first outer coil end 210 is used for grounding, the second inner coil end 320 is grounded through a first via hole, and the first coil end 310 outputs a first voltage through a second via hole. In fig. 4, the hatched areas 211 represent the entire conductive layer. In this embodiment, the primary auxiliary coil is realized by a simple and reasonable structure.
In some embodiments, outer coil 200 includes a plurality of outer arc segments 240 and a plurality of outer non-arc segments 230, each outer arc segment having a curvature in excess of 270 °, two adjacent outer arc segments 240 connected by an outer non-arc segment 230; the inner coil 300 comprises a plurality of inner circular arc segments 340 and a plurality of inner non-circular arc segments 330, the radian of each inner circular arc segment 340 exceeds 270 °, two adjacent inner circular arc segments 340 are connected by one inner non-circular arc segment 330, wherein the first inner coil end 310 and the second inner coil end 320 are both located at the corresponding inner non-circular arc segment 330. In this embodiment, the outer coil 200 and the inner coil 300 may have circular arcs as complete as possible to ensure the performance of the planar transformer, and in addition, the first inner coil end 310 and the second inner coil end 320 are disposed in the inner non-circular arc section 330, which facilitates the terminals to be led out from the layer where the planar composite coil 10 is located, so as to be connected with the rest of the circuit. In the present embodiment, the first inner coil end 310 serves as a positive high voltage end P3; a negative pressure end 250 (P1) is provided at a position of the outer non-circular arc section 230 between the first outer coil end 210 and the second outer coil end 220, and in some embodiments, the negative pressure end 250 (P1) is formed to extend from the outer non-circular arc section 230; a positive low pressure end 350 (P2) is provided at the inner non-circular arc section 330 between the first inner coil end 310 and the second inner coil end 320. The second outer coil end 220 may exist as a free hanging end, and of course, the negative pressure end 250 (P1) may coincide with the second outer coil end 220.
In some embodiments, the innermost inner non-circular arc segment of the inner coil 300 comprises an innermost shielding segment 331, the innermost shielding segment 331 gradually decreases in width from a position near the inner side of the planar composite coil to the second inner coil end 320, and the width of the innermost shielding segment 331 is greater than the width of all inner circular arc segments 340. In this way, the interference rejection of the primary auxiliary coil can be improved.
In some embodiments, the inner non-circular arc section 330 on the second inner side of the inner coil 300 further includes a secondary inner shielding section 332, the secondary inner shielding section 332 gradually increases in width from the contact position connected with the innermost inner circular arc section 300 to a position away from the contact position, and the width of the secondary inner shielding section 332 is greater than the width of all the inner circular arc sections 300. In this way, the interference rejection of the primary auxiliary coil can be further improved.
In some embodiments, a third via 400 is further disposed on the substrate 100, the third via 400 is disposed proximate to the innermost shielding segment 331 and the secondary inner shielding segment 332, the innermost shielding segment 331 and the secondary inner shielding segment 332 together surround the third via 400 in a semi-surrounding manner, leaving a gap between the innermost shielding segment 331 and the secondary inner shielding segment 332, and the third via 400 is notched at a position facing the magnetic core. The third via hole is a via hole formed on the planar composite coil for connecting the rest of the coil or the circuit.
It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
It will be understood that the above-described embodiments are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions may be made in the details described herein by those skilled in the art without departing from the basic principles of the invention.
Claims (10)
1. The utility model provides a planar composite coil of planar transformer, includes the base plate, its characterized in that still includes outer coil and inner coil, outer coil and inner coil set up in on the base plate, the inner coil is located the inboard of outer coil, the outer coil includes first outer coil end and second outer coil end, the inner coil includes first inner coil end and second inner coil end, certainly first outer coil end constitutes to the many circles conducting layer of second outer coil end inward winding the outer coil, certainly first inner coil end constitutes to the many circles conducting layer of second inner coil end inward winding the inner coil, first outer coil end is used for ground connection, second inner coil end is through first via hole ground connection, first coil end is used for exporting first voltage through the second via hole.
2. Planar composite coil according to claim 1,
the outer coil comprises a plurality of outer arc sections and a plurality of outer non-arc sections, the radian of each outer arc section exceeds 270 degrees, and two adjacent outer arc sections are connected through one outer non-arc section;
the inner coil comprises a plurality of inner circular arc sections and a plurality of inner non-circular arc sections, the radian of each inner circular arc section exceeds 270 degrees, and two adjacent inner circular arc sections are connected through one inner non-circular arc section.
3. Planar composite coil according to claim 2,
the innermost non-circular arc section in the inner coil comprises an innermost shielding section, the width of the innermost shielding section is gradually reduced from a position close to the inner side of the planar composite coil to the second inner coil end, and the width of the innermost shielding section is larger than the width of all the inner circular arc sections.
4. Planar composite coil according to claim 3,
the inner non-circular arc section of the inner coil inner side comprises a secondary inner shielding section, the width of the secondary inner shielding section is gradually increased from a contact position connected with the innermost inner circular arc section to a position far away from the contact position, and the width of the secondary inner shielding section is larger than the width of all the inner circular arc sections.
5. Planar composite coil according to claim 4,
still be equipped with the third via hole on the base plate, the third via hole set up in pressing close to the position of shielding section in innermost and inferior, shielding section surrounds with the mode of partly enclosing jointly in innermost shielding section and inferior the third via hole.
6. A planar transformer comprising a primary coil, a primary auxiliary coil, a magnetic core and a secondary coil, the primary auxiliary coil and the secondary coil being magnetically coupled by the magnetic core, wherein the primary auxiliary coil is a planar composite coil as claimed in any one of claims 1 to 5.
7. An auxiliary voltage generating circuit of a transformer, characterized by comprising a transformer, wherein the transformer employs the planar transformer of claim 6.
8. The auxiliary voltage generation circuit of claim 7,
the transformer is not provided with the planar transformer, and comprises a primary main coil, a primary auxiliary coil and a magnetic core, wherein the primary main coil and the primary auxiliary coil form magnetic coupling through the magnetic core, the primary auxiliary coil comprises a positive high-voltage end and a positive low-voltage end, and the difference between the positive high-voltage output by the positive high-voltage end and the positive low-voltage output by the positive low-voltage end is greater than the conduction threshold voltage of the switching tube;
the cathode of the first diode is connected with the current outflow end of the switching tube, and the anode of the first diode is connected with the positive low-voltage end; the cathode of the second diode is connected with the current inflow end of the switching tube, and the anode of the second diode is connected with the positive high-voltage end; the current inflow end of the switching tube is grounded through the first capacitor; the current outflow end of the switching tube is used as a power supply end of a post-stage circuit, and the power supply end is grounded through the second capacitor; the cathode of the second diode is connected with the control end of the switching tube through the resistor;
when the voltages of the positive high-voltage end and the positive low-voltage end are both greater than the clamping threshold voltage of the clamping circuit, the clamping circuit clamps the voltage of the control end of the switching tube at the clamping threshold voltage, the switching tube is turned off, and the positive low-voltage end supplies power to the power supply end through the first diode; when the voltage of the positive high-voltage end is smaller than the clamping threshold voltage of the clamping voltage, the clamping circuit cannot clamp, the switch tube is conducted, the positive high-voltage end supplies power to the power supply end through the second diode and the switch tube, and the positive low-voltage end supplies power to the power supply end through the first diode.
9. The auxiliary voltage generating circuit of claim 8,
the primary auxiliary coil comprises a grounding end and a negative voltage end;
the grounding end is grounded, the cathode of the third diode is connected with the current inflow end of the switching tube through the inductor, and the anode of the third diode is connected with the negative voltage end;
when the voltage of the positive high-voltage end is smaller than the clamping threshold voltage of the clamping voltage, in the stage of magnetizing the primary main coil, the positive high-voltage end and the positive low-voltage end stop supplying power to the power supply end, and the negative voltage end supplies power to the power supply end through the third diode, the inductor and the switching tube.
10. The auxiliary voltage generation circuit of claim 9,
the clamping circuit is a voltage stabilizing diode, the cathode of the voltage stabilizing diode is connected with the control end of the switch tube, and the anode of the voltage stabilizing diode is grounded.
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| CN202222519367.7U CN218513288U (en) | 2022-09-22 | 2022-09-22 | Planar transformer, planar composite coil thereof and auxiliary voltage generating circuit |
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| CN202222519367.7U CN218513288U (en) | 2022-09-22 | 2022-09-22 | Planar transformer, planar composite coil thereof and auxiliary voltage generating circuit |
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