CN210246608U - Flyback circuit - Google Patents
Flyback circuit Download PDFInfo
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- CN210246608U CN210246608U CN201921157738.3U CN201921157738U CN210246608U CN 210246608 U CN210246608 U CN 210246608U CN 201921157738 U CN201921157738 U CN 201921157738U CN 210246608 U CN210246608 U CN 210246608U
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Abstract
The utility model relates to a flyback circuit, the Vin port is connected with the D pole of a field effect transistor Q1, and the S pole of the field effect transistor Q1 is connected with an absorber and a primary winding T1 in parallel and then is connected with the input ground; the auxiliary winding T3 and the primary winding T1 are on the same side, the upper part of the auxiliary winding T3 is connected with the anode of a diode I D1, the lower part of the auxiliary winding T3 is connected with the cathode of a diode I D1 after being connected with a capacitor I C1, a Vcc port is arranged between the diode I D1 and the capacitor I C1, and the input ground is connected between the capacitor I C1 and the auxiliary winding T3; the other side of the primary winding T1 is provided with a secondary winding T2, the upper part of the secondary winding T2 is connected with the anode of a diode two D2, the diode two D2 is connected with the lower part of the secondary winding T2 after being connected with a capacitor two C2, and a V is arranged between the diode two D2 and the capacitor two C20The port, the secondary winding T2 and the capacitor two C2 are connected with each otherAnd (6) discharging. The utility model discloses be particularly useful for the high voltage input occasion more than 3 kV.
Description
Technical Field
The utility model relates to an electronic circuit technical field, especially a transformer reliability under transformer port insulation easy to handle, the equal size condition improves, is particularly useful for the flyback circuit of high voltage input occasion more than 3 kV.
Background
"flyback" (FLY BACK) specifically means that when the switching tube is switched on, the output transformer acts as an inductor, electric energy is converted into magnetic energy, and at the moment, no current flows in an output loop; on the contrary, when the switching tube is turned off, the output transformer releases energy, the magnetic energy is converted into electric energy, and current flows in an output loop. The flyback switching power supply is a switching power supply which uses a flyback high-frequency transformer to isolate an input and output loop, and a forward switching power supply is correspondingly arranged. The flyback specifically means that when the switching tube is switched on, the output transformer serves as an inductor, electric energy is converted into magnetic energy, and at the moment, no current exists in an output loop, and conversely, when the switching tube is switched off, the output transformer releases energy, the magnetic energy is converted into electric energy, and current exists in the output loop. In the flyback switching power supply, the output transformer serves as an energy storage inductor, and the whole power supply is small in size and simple in structure, so that the flyback switching power supply is widely applied. The most used is the single-ended flyback switching power supply. The power supply has the advantages of few components, simple circuit, low cost and small volume, can simultaneously output multi-path mutually isolated voltage, has the defects of high voltage bearing capacity of a switching tube, low utilization rate of an output transformer, larger EMI ratio which is not suitable for a high-power supply, generally speaking, the switching power supply within 100W usually adopts a single-end flyback type, the switching power supply exceeding 100W-300W usually adopts a forward type or a half-bridge type, and the power supply above 300W usually adopts a full-bridge type.
In the prior art, the primary winding of the transformer is above the switching tube. The transformer comprises six ports of a primary winding, a secondary winding and a Vcc auxiliary winding, wherein the six ports of the three windings are total, and the traditional flyback is 2 high-voltage ports and 4 low-voltage ports. As shown in FIG. 2, port A has a high voltage dv/dt, which is a high voltage, and this point in the transformer design needs to be considered for sufficient isolation from the Vin port and the Vcc port.
A flyback circuit is needed, which has the advantages of easy processing of transformer port insulation, improved transformer reliability under the condition of the same size and is particularly suitable for high-voltage input occasions of more than 3 kV.
Disclosure of Invention
The utility model aims at providing an insulating easy processing of transformer port, transformer reliability under the equal size condition improves, is particularly useful for the flyback circuit of high voltage input occasion more than 3 kV.
A flyback circuit comprising:
the Vin port is connected with the D pole of a field effect transistor Q1, and the S pole of the field effect transistor Q1 is connected with an absorber and a primary winding T1 in parallel and then is connected with the input ground;
the auxiliary winding T3, the auxiliary winding T3 and the primary winding T1 are on the same side, the upper part of the auxiliary winding T3 is connected with the anode of a diode I D1, the lower part of the auxiliary winding T3 is connected with a capacitor I C1 and then connected with the cathode of a diode I D1, a Vcc port is arranged between the diode I D1 and the capacitor I C1, and an input ground is connected between the capacitor I C1 and the auxiliary winding T3;
a secondary winding T2 is arranged on the other side of the primary winding T1, the upper part of the secondary winding T2 is connected with the anode of a diode II D2, the diode II D2 is connected with a capacitor II C2 and then connected to the lower part of a secondary winding T2, and a V is arranged between the diode II D2 and the capacitor II C20And the port is connected between the secondary winding T2 and the capacitor two C2 to output ground.
The diode one D1 is connected with the anode of the capacitor one C1.
The diode two D2 is connected with the anode of the capacitor two C2.
The Vin port of the utility model is connected with the D pole of a field effect transistor Q1, and the S pole of the field effect transistor Q1 is connected with an absorber and a primary winding T1 in parallel and then is connected with the input ground; the auxiliary winding T3 and the primary winding T1 are on the same side, the upper part of the auxiliary winding T3 is connected with the anode of a diode I D1, the lower part of the auxiliary winding T3 is connected with the cathode of a diode I D1 after being connected with a capacitor I C1, a Vcc port is arranged between the diode I D1 and the capacitor I C1, and the input ground is connected between the capacitor I C1 and the auxiliary winding T3; the other side of the primary winding T1 is provided with a secondary winding T2, the upper part of the secondary winding T2 is connected with the anode of a diode two D2, the diode two D2 is connected with the lower part of the secondary winding T2 after being connected with a capacitor two C2, and a V is arranged between the diode two D2 and the capacitor two C20The port, the secondary winding T2 and the capacitor two C2 are connected with the output ground. The utility model discloses transformer port is insulating easy to handle, transformer reliability under the equal size condition improves, is particularly useful for the high voltage input occasion more than 3 kV.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of the prior art of the present invention;
in the figure: q1 is a field effect transistor, G is the G pole of Q1, D is the D pole of Q1, S is the S pole of Q1, A is the port, T1 is the primary winding, T2 is the secondary winding, T3 is the auxiliary winding, D1 is a first diode, D2 is a second diode, C1 is a first capacitor, and C2 is a second capacitor.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
A flyback circuit comprising: the Vin port is connected with the D pole of a field effect transistor Q1, and the S pole of the field effect transistor Q1 is connected with an absorber and a primary winding T1 in parallel and then is connected with the input ground; the auxiliary winding T3 is characterized in that the auxiliary winding T3 is on the same side as the primary winding T1, the upper part of the auxiliary winding T3 is connected with the anode of a diode I D1, the lower part of the auxiliary winding T3 is connected with a capacitor I C1 and then connected with the cathode of a diode I D1, a Vcc port is arranged between the diode I D1 and the capacitor I C1, and an input ground is connected between the capacitor I C1 and the auxiliary winding T3; the other side of the primary winding T1 is provided with a secondary winding T2, the upper part of the secondary winding T2 is connected with the anode of a diode two D2, the diode two D2 is connected with the lower part of the secondary winding T2 after being connected with a capacitor two C2, and a V is arranged between the diode two D2 and the capacitor two C20The port, the secondary winding T2 and the capacitor two C2 are connected with the output ground.
The diode one D1 is connected to the anode of the capacitor one C1. The diode two D2 is connected with the anode of the capacitor two C2.
The primary winding T1 of the transformer is above the switch tube. The transformer comprises six ports of three windings including a primary winding T1, a secondary winding T2 and a VCC auxiliary winding T3, wherein the six ports are 1 high-voltage port and 5 low-voltage ports. The transformer port insulation is easy to handle. The reliability of the transformer under the same size condition is improved. Is especially suitable for high voltage input occasions of more than 3 kV.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A flyback circuit, comprising:
the Vin port is connected with the D pole of a field effect transistor Q1, and the S pole of the field effect transistor Q1 is connected with an absorber and a primary winding T1 in parallel and then is connected with the input ground;
the auxiliary winding T3, the auxiliary winding T3 and the primary winding T1 are on the same side, the upper part of the auxiliary winding T3 is connected with the anode of a diode I D1, the lower part of the auxiliary winding T3 is connected with a capacitor I C1 and then connected with the cathode of a diode I D1, a Vcc port is arranged between the diode I D1 and the capacitor I C1, and an input ground is connected between the capacitor I C1 and the auxiliary winding T3;
a secondary winding T2 is arranged on the other side of the primary winding T1, the upper part of the secondary winding T2 is connected with the anode of a diode II D2, the diode II D2 is connected with a capacitor II C2 and then connected to the lower part of a secondary winding T2, and a V is arranged between the diode II D2 and the capacitor II C20And the port is connected between the secondary winding T2 and the capacitor two C2 to output ground.
2. A flyback circuit as in claim 1, wherein the diode-D1 is connected to the positive terminal of the capacitor-C1.
3. A flyback circuit as in claim 1 wherein the diode two D2 is connected to the anode of the capacitor two C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921157738.3U CN210246608U (en) | 2019-07-23 | 2019-07-23 | Flyback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921157738.3U CN210246608U (en) | 2019-07-23 | 2019-07-23 | Flyback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210246608U true CN210246608U (en) | 2020-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921157738.3U Active CN210246608U (en) | 2019-07-23 | 2019-07-23 | Flyback circuit |
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| Country | Link |
|---|---|
| CN (1) | CN210246608U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266195A (en) * | 2019-07-23 | 2019-09-20 | 上海麟荣电子技术有限公司 | A kind of circuit of reversed excitation |
-
2019
- 2019-07-23 CN CN201921157738.3U patent/CN210246608U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266195A (en) * | 2019-07-23 | 2019-09-20 | 上海麟荣电子技术有限公司 | A kind of circuit of reversed excitation |
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