CN211377890U - 40W flyback power supply circuit - Google Patents
40W flyback power supply circuit Download PDFInfo
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- CN211377890U CN211377890U CN202020252090.4U CN202020252090U CN211377890U CN 211377890 U CN211377890 U CN 211377890U CN 202020252090 U CN202020252090 U CN 202020252090U CN 211377890 U CN211377890 U CN 211377890U
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Abstract
The utility model discloses a 40W flyback power supply circuit, which comprises a mains supply input end, a surge protection circuit, a common mode inductor, a rectifying circuit, a clamping absorption circuit, a feedback circuit, an overvoltage protection module, a load circuit, a power conversion module and a display circuit; the commercial power input end is sequentially connected with a surge protection circuit, a common-mode inductor, a rectifying circuit, a clamping absorption circuit and a feedback circuit, the clamping absorption circuit is connected with a power conversion module, and the power conversion module is respectively connected with a display circuit, a load circuit and an overvoltage protection module; the overvoltage protection module comprises a transient voltage suppressor connected with the output end of the power conversion module in parallel, a peak eliminating module is connected on the transient voltage suppressor in parallel, and the peak eliminating module carries out peak eliminating protection on the transient voltage suppressor; the utility model discloses the circuit is simple, and the components and parts that use are few, and noise figure is little, and wide voltage input is applicable to and uses in the different countries.
Description
Technical Field
The utility model relates to switching power supply field especially involves a 40W flyback power supply circuit.
Background
In recent years, the application range of the switching power supply is more and more extensive, the switching power supply has small volume, portability, high energy utilization rate and special green function, and the system works in an energy-saving mode under the condition of no load or low load, so that the switching power supply is widely applied to the fields of aerospace, household appliances, communication, instruments and meters, industrial control, medical equipment and the like, and has more and more development prospect along with the development of electronic technology.
The flyback power supply is a circuit which does not provide power output to a load when a primary coil of a transformer is just excited by direct-current pulse voltage, and provides power output to the load only after the excitation voltage of the primary coil of the transformer is switched off; the circuit has the advantages of low cost, simple control, small circuit volume and the like;
however, the transformer of the flyback power supply has a large leakage inductance, and particularly at the moment when the switching tube of the flyback power supply is turned on to be turned off, a large peak current appears on the primary winding side of the transformer, so that the switching tube is broken down, and the household electrical appliances such as an air conditioner and the like cannot normally operate. Therefore, the conventional flyback power supply circuit has the disadvantage of poor operational reliability.
Accordingly, the prior art is deficient and needs improvement.
SUMMERY OF THE UTILITY MODEL
The utility model provides a 40W flyback power supply circuit, the above-mentioned problem of solution.
In order to solve the above problem, the utility model provides a technical scheme as follows:
A40W flyback power supply circuit comprises a mains supply input end, a voltage stabilizing circuit, a voltage; the commercial power input end is sequentially connected with a surge protection circuit, a common-mode inductor, a rectifying circuit, a clamping absorption circuit and a feedback circuit, the clamping absorption circuit is connected with a power conversion module, and the power conversion module is respectively connected with a display circuit, a load circuit and an overvoltage protection module; the overvoltage protection module comprises a transient voltage suppressor connected with the output end of the power conversion module in parallel, a peak eliminating module is connected on the transient voltage suppressor in parallel, and the peak eliminating module carries out peak eliminating protection on the transient voltage suppressor.
In one embodiment, the surge protection circuit includes a connector JP1, a protection switch F1 and a capacitor CX, a second port of the connector JP1 is connected to a first end of the protection switch F1, a first port of the connector JP1 is connected to a second end of the capacitor CX and a first port of a common mode inductor LF1, a second port of the protection switch F1 is connected to a first end of the capacitor CX and a third port of the common mode inductor LF1, and an output end of the common mode inductor LF1 is connected to an input end of the rectifier circuit.
In one embodiment, the clamp snubber circuit includes resistors R1-R4, a capacitor C4, and a diode D1; the port 4 of the rectifying circuit is respectively connected with a first end of a resistor R1, a first end of resistors R3-R4 and a first end of a capacitor C4, a second end of the capacitor C4 is respectively connected with a cathode of a diode D1 and a second end of the resistors R3-R4, and a second end of the resistor R1 is connected with a first end of a resistor R2.
In one embodiment, the feedback circuit includes an integrated circuit U1, capacitors C2-C3, and resistors R6-R8; the pin of the integrated circuit U1 is connected with the second end of a resistor R8, the first end of the resistor R8 is respectively connected with the second pin of the integrated circuit U1, the second end of the resistor R2 and the first end of a capacitor C2, the pin eight of the integrated circuit U1 is respectively connected with the first pin of a rectifying circuit, the second end of the capacitor C1, the second ends of the resistors R6-R7 and the second end of the capacitor C3, the four pins of the integrated circuit U1 are respectively connected with the first ends of the resistors R6-R7, and the third pin of the integrated circuit U1 is connected with the first end of the capacitor C3.
In one embodiment, the power conversion module includes a transformer T1, a capacitor CY3, a resistor R5, and a diode D2; the tap of the transformer T1 is connected with a first end of a capacitor C4, the tap of the transformer T1 is connected with the anode of a diode D1, the pin five and the pin six of an integrated circuit U1, the tap of the transformer T1 is connected with a second end of a resistor R5, the first end of the resistor R5 is connected with the anode of the diode D2, the cathode of the diode D2 is connected with the first end of the capacitor C2 and the second end of the resistor R2, the tap of the transformer T1 is connected with the second end of the capacitor C2, the second end of the resistor R7, the pin four of a rectifying circuit and the first end of the capacitor CY3, and the second end of the capacitor CY3 is connected with the tap six of the transformer T1.
In one embodiment, the overvoltage protection module comprises an integrated circuit D3, a capacitor C7, and resistors R9-R10; the first end of the capacitor C7 is respectively connected with a fifth tap of a transformer T1 and a first pin and a third pin of an integrated circuit D3, the second end of the capacitor C7 is respectively connected with first ends of resistors R9-R10, and second ends of the resistors R9-R10 are respectively connected with a second pin of the integrated circuit D3.
In one embodiment, the display circuit comprises an integrated circuit U2, resistors R11-R15, a diode U3 and capacitors C8, C10-C11; a first pin of the integrated circuit U2 is connected to a first end of a capacitor C3, a second pin of the integrated circuit U2 is connected to a second end of a resistor R7, three pins of the integrated circuit U2 are respectively connected to a second end of a resistor R11 and a first end of a resistor R12, four pins of the integrated circuit U2 are respectively connected to a first end of a capacitor C11, a second end of a resistor R12, a first end of a capacitor C8 and a second pin of a diode U3, a first end of the capacitor C8 is connected to a first end of a resistor R13, and a second end of the resistor R13 is respectively connected to a second end of a resistor R14, a second end of a capacitor C10, a first pin of a diode U3 and a first end of a resistor R15; the second end of the capacitor C11 is connected with the third pin of the diode U3 and the second end of the resistor R15, and the first end of the capacitor C10 is connected with the third end of the resistor R12.
In one embodiment, the load circuit includes an inductor L1, capacitors C5-C6, capacitor C9, and connectors JP2-JP 6; a first end of the inductor L1 is connected to a first end of a capacitor C5, a second end of a pin of an integrated circuit U3, a second end of a resistor R10, and a first end of a resistor R11, a second end of the inductor L1 is connected to a first end of a capacitor C6, and a second end of the capacitor C6 is connected to a second end of the capacitor C5, a first end of a capacitor C9, a sixth tap of a transformer T1, and a second end of the resistor R15; the second terminal of the capacitor C9 is grounded, and the connector JP2-JP6 is connected in parallel with the second terminal of the inductor L1 and the second terminal of the capacitor C6.
Compared with the prior art, the invention has the beneficial effects that by adopting the scheme, the filtering function of commercial power is increased by using the filtering module, the circuit components are effectively protected by using the protection switch F1, the leakage current is placed by using the capacitor C1 when the circuit is used, and the peak eliminating treatment is carried out on the current by arranging the overvoltage protection module, so that the breakdown of the switch power supply module is avoided. The noise figure is small, and wide voltage input is suitable for being used in different countries. The system is composed of a PWM (pulse-width modulation) chip with a CRE6359DSF as a core and a perfect peripheral circuit.
Drawings
For a clearer explanation of the embodiments or technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained from the drawings without creative efforts.
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a circuit diagram of the overall structure of the present invention;
FIG. 3 is a block diagram of the overall architecture of the present invention;
as shown in the above legend: a surge protection circuit 1; a common mode inductor 2; a rectification circuit 3; a clamp absorption circuit 4; a power conversion module 5; a feedback circuit 6; an overvoltage protection module 7; a display circuit 8; a load circuit 9.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The use of the terms "fixed," "integrally formed," "left," "right," and the like in this specification is for illustrative purposes only, and elements having similar structures are designated by the same reference numerals in the figures.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1-3, one embodiment of the present invention is:
A40W flyback power supply circuit comprises a mains supply input end, a voltage stabilizing circuit, a common mode inductor, a rectifier circuit, a clamp absorption circuit, a feedback circuit, a voltage stabilizing module, a power conversion module and a display circuit, wherein the mains supply input end comprises a surge protection circuit 1, a common mode inductor 2, a rectifier circuit 3, a clamp absorption circuit 4, a feedback circuit 6, an overvoltage; the commercial power input end is sequentially connected with a surge protection circuit 1, a common mode inductor 2, a rectifying circuit 3, a clamping absorption circuit 4 and a feedback circuit 6, the clamping absorption circuit 4 is connected with a power conversion module 5, and the power conversion module 5 is respectively connected with a display circuit 8, a load circuit 9 and an overvoltage protection module 7; the overvoltage protection module 7 comprises a transient voltage suppressor connected with the output end of the power conversion module 5 in parallel, a peak eliminating module is connected on the transient voltage suppressor in parallel, and the peak eliminating module carries out peak eliminating protection on the transient voltage suppressor.
According to a preferred technical scheme, the surge protection circuit 1 comprises a connector JP1, a protection switch F1 and a capacitor CX, a second port of the connector JP1 is connected with a first end of the protection switch F1, a first port of the connector JP1 is connected with a second end of the capacitor CX and a first port of a common-mode inductor 2LF1, a second end of the protection switch F1 is connected with a first end of the capacitor CX and a third port of the common-mode inductor 2LF1, and an output end of the common-mode inductor 2LF1 is connected with an input end of the rectification circuit 3.
According to the preferable technical scheme, the clamp absorption circuit 4 comprises resistors R1-R4, a capacitor C4 and a diode D1; the port 4 of the rectifying circuit 3 is respectively connected with a first end of a resistor R1, a first end of resistors R3-R4 and a first end of a capacitor C4, a second end of the capacitor C4 is respectively connected with a cathode of a diode D1 and a second end of the resistors R3-R4, and a second end of the resistor R1 is connected with a first end of a resistor R2.
In a preferred technical solution, the feedback circuit 6 includes an integrated circuit U1, capacitors C2-C3, and resistors R6-R8; the pin of the integrated circuit U1 is connected with the second end of a resistor R8, the first end of the resistor R8 is respectively connected with the second pin of the integrated circuit U1, the second end of the resistor R2 and the first end of a capacitor C2, the eighth pin of the integrated circuit U1 is respectively connected with the first pin of the rectifying circuit 3, the second end of the capacitor C1, the second ends of the resistors R6-R7 and the second end of the capacitor C3, the fourth pin of the integrated circuit U1 is respectively connected with the first ends of the resistors R6-R7, and the third pin of the integrated circuit U1 is connected with the first end of the capacitor C3.
In a preferred technical solution, the power conversion module 5 includes a transformer T1, a capacitor CY3, a resistor R5, and a diode D2; the tap of the transformer T1 is connected with a first end of a capacitor C4, the tap of the transformer T1 is connected with the anode of a diode D1, the fifth pin and the sixth pin of an integrated circuit U1, the tap of the transformer T1 is connected with a second end of a resistor R5, the first end of the resistor R5 is connected with the anode of the diode D2, the cathode of the diode D2 is connected with the first end of the capacitor C2 and the second end of the resistor R2, the tap of the transformer T1 is connected with the second end of the capacitor C2, the second end of the resistor R7, the fourth pin of the rectifying circuit 3 and the first end of the capacitor CY3, and the second end of the capacitor CY3 is connected with the sixth pin of the transformer T1.
In a preferred technical solution, the overvoltage protection module 7 includes an integrated circuit D3, a capacitor C7, and resistors R9-R10; the first end of the capacitor C7 is respectively connected with a fifth tap of a transformer T1 and a first pin and a third pin of an integrated circuit D3, the second end of the capacitor C7 is respectively connected with first ends of resistors R9-R10, and second ends of the resistors R9-R10 are respectively connected with a second pin of the integrated circuit D3.
In a preferred technical scheme, the display circuit 8 comprises an integrated circuit U2, resistors R11-R15, a diode U3, capacitors C8 and capacitors C10-C11; a first pin of the integrated circuit U2 is connected to a first end of a capacitor C3, a second pin of the integrated circuit U2 is connected to a second end of a resistor R7, three pins of the integrated circuit U2 are respectively connected to a second end of a resistor R11 and a first end of a resistor R12, four pins of the integrated circuit U2 are respectively connected to a first end of a capacitor C11, a second end of a resistor R12, a first end of a capacitor C8 and a second pin of a diode U3, a first end of the capacitor C8 is connected to a first end of a resistor R13, and a second end of the resistor R13 is respectively connected to a second end of a resistor R14, a second end of a capacitor C10, a first pin of a diode U3 and a first end of a resistor R15; the second end of the capacitor C11 is connected with the third pin of the diode U3 and the second end of the resistor R15, and the first end of the capacitor C10 is connected with the third end of the resistor R12.
In a preferred technical solution, the load circuit 9 includes an inductor L1, capacitors C5-C6, a capacitor C9, and connectors JP2-JP 6; a first end of the inductor L1 is connected to a first end of a capacitor C5, a second end of a pin of an integrated circuit U3, a second end of a resistor R10, and a first end of a resistor R11, a second end of the inductor L1 is connected to a first end of a capacitor C6, and a second end of the capacitor C6 is connected to a second end of the capacitor C5, a first end of a capacitor C9, a sixth tap of a transformer T1, and a second end of the resistor R15; the second terminal of the capacitor C9 is grounded, and the connector JP2-JP6 is connected in parallel with the second terminal of the inductor L1 and the second terminal of the capacitor C6.
Further, a capacitor C1 is connected in parallel with the output end of the rectifying circuit, and the larger the capacitance of the capacitor C1 is, the larger the leakage current is.
The working principle is as follows:
the mains supply is connected into the connector JP1, the connector JP1 provides electric energy, and the protection switch F1 can prevent surge and lightning stroke to protect the circuit when receiving large current impact; then, a larger current is filtered by the capacitor CX, then the current passes through the common-mode inductor LF1, and radiation is suppressed by the common-mode inductor LF1, when the current passes through the capacitor C1, the larger the capacitance of the capacitor C1 is, the larger the leakage current is, the current is output after passing through the primary rectifier module, at this time, the integrated circuit U1 is turned on, so that the initial current is smaller after the direct current passes through the transformer L1, the current charges the capacitor C2 after passing through the resistor R5, the capacitor C2 energizes the integrated circuit U1, and then the integrated circuit U1 is turned off, so that the current is output by the secondary winding of the transformer L1, because the voltage output by the secondary winding is larger and the peak value is too high, after the overvoltage protection module performs peak eliminating processing on the output voltage, a stable direct current is formed to enable the current to enter a load circuit and a display circuit, the stable direct current drives components on the load circuit, and a display lamp on the display circuit detects, when the current is too large, the light emitting diode is brighter, when the current is smaller, the light emitting diode becomes darker, and meanwhile, the stability of the current of the positive load circuit and the negative load circuit is regulated and controlled through the integrated circuit U1.
The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; also, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A40W flyback power supply circuit comprises a mains supply input end and is characterized by comprising a surge protection circuit, a common mode inductor, a rectifying circuit, a clamping absorption circuit, a feedback circuit, an overvoltage protection module, a load circuit, a power conversion module and a display circuit; the commercial power input end is sequentially connected with a surge protection circuit, a common-mode inductor, a rectifying circuit, a clamping absorption circuit and a feedback circuit, the clamping absorption circuit is connected with a power conversion module, and the power conversion module is respectively connected with a display circuit, a load circuit and an overvoltage protection module; the overvoltage protection module comprises a transient voltage suppressor connected with the output end of the power conversion module in parallel, a peak eliminating module is connected on the transient voltage suppressor in parallel, and the peak eliminating module carries out peak eliminating protection on the transient voltage suppressor.
2. The 40W flyback power supply circuit according to claim 1, wherein the surge protection circuit comprises a connector JP1, a protection switch F1 and a capacitor CX, the second port of the connector JP1 is connected to the first port of the protection switch F1, the first port of the connector JP1 is connected to the second port of the capacitor CX and the first port of the common-mode inductor LF1, the second port of the protection switch F1 is connected to the first port of the capacitor CX and the third port of the common-mode inductor LF1, and the output end of the common-mode inductor LF1 is connected to the input end of the rectifier circuit.
3. The 40W flyback power supply circuit of claim 1, wherein the clamp snubber circuit comprises resistors R1-R4, a capacitor C4 and a diode D1; the port 4 of the rectifying circuit is respectively connected with a first end of a resistor R1, a first end of resistors R3-R4 and a first end of a capacitor C4, a second end of the capacitor C4 is respectively connected with a cathode of a diode D1 and a second end of the resistors R3-R4, and a second end of the resistor R1 is connected with a first end of a resistor R2.
4. The 40W flyback power supply circuit of claim 3, wherein the feedback circuit comprises an integrated circuit U1, capacitors C2-C3, and resistors R6-R8; the pin of the integrated circuit U1 is connected with the second end of a resistor R8, the first end of the resistor R8 is respectively connected with the second pin of the integrated circuit U1, the second end of the resistor R2 and the first end of a capacitor C2, the pin eight of the integrated circuit U1 is respectively connected with the first pin of a rectifying circuit, the second end of the capacitor C1, the second ends of the resistors R6-R7 and the second end of the capacitor C3, the four pins of the integrated circuit U1 are respectively connected with the first ends of the resistors R6-R7, and the third pin of the integrated circuit U1 is connected with the first end of the capacitor C3.
5. The 40W flyback power supply circuit of claim 4, wherein the power conversion module comprises a transformer T1, a capacitor CY3, a resistor R5 and a diode D2; the tap of the transformer T1 is connected with a first end of a capacitor C4, the tap of the transformer T1 is connected with the anode of a diode D1, the pin five and the pin six of an integrated circuit U1, the tap of the transformer T1 is connected with a second end of a resistor R5, the first end of the resistor R5 is connected with the anode of the diode D2, the cathode of the diode D2 is connected with the first end of the capacitor C2 and the second end of the resistor R2, the tap of the transformer T1 is connected with the second end of the capacitor C2, the second end of the resistor R7, the pin four of a rectifying circuit and the first end of the capacitor CY3, and the second end of the capacitor CY3 is connected with the tap six of the transformer T1.
6. The 40W flyback power supply circuit of claim 1, wherein the overvoltage protection module comprises an integrated circuit D3, a capacitor C7 and resistors R9-R10; the first end of the capacitor C7 is respectively connected with a fifth tap of a transformer T1 and a first pin and a third pin of an integrated circuit D3, the second end of the capacitor C7 is respectively connected with first ends of resistors R9-R10, and second ends of the resistors R9-R10 are respectively connected with a second pin of the integrated circuit D3.
7. The 40W flyback power supply circuit of claim 1, wherein the display circuit comprises an integrated circuit U2, resistors R11-R15, a diode U3, and capacitors C8, C10-C11; a first pin of the integrated circuit U2 is connected to a first end of a capacitor C3, a second pin of the integrated circuit U2 is connected to a second end of a resistor R7, three pins of the integrated circuit U2 are respectively connected to a second end of a resistor R11 and a first end of a resistor R12, four pins of the integrated circuit U2 are respectively connected to a first end of a capacitor C11, a second end of a resistor R12, a first end of a capacitor C8 and a second pin of a diode U3, a first end of the capacitor C8 is connected to a first end of a resistor R13, and a second end of the resistor R13 is respectively connected to a second end of a resistor R14, a second end of a capacitor C10, a first pin of a diode U3 and a first end of a resistor R15; the second end of the capacitor C11 is connected with the third pin of the diode U3 and the second end of the resistor R15, and the first end of the capacitor C10 is connected with the third end of the resistor R12.
8. The 40W flyback power supply circuit of claim 6, wherein the load circuit comprises an inductor L1, capacitors C5-C6, a capacitor C9, and connectors JP2-JP 6; a first end of the inductor L1 is connected to a first end of a capacitor C5, a second end of a pin of an integrated circuit U3, a second end of a resistor R10, and a first end of a resistor R11, a second end of the inductor L1 is connected to a first end of a capacitor C6, and a second end of the capacitor C6 is connected to a second end of the capacitor C5, a first end of a capacitor C9, a sixth tap of a transformer T1, and a second end of the resistor R15; the second terminal of the capacitor C9 is grounded, and the connector JP2-JP6 is connected in parallel with the second terminal of the inductor L1 and the second terminal of the capacitor C6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020252090.4U CN211377890U (en) | 2020-03-04 | 2020-03-04 | 40W flyback power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020252090.4U CN211377890U (en) | 2020-03-04 | 2020-03-04 | 40W flyback power supply circuit |
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| CN211377890U true CN211377890U (en) | 2020-08-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271939A (en) * | 2020-11-06 | 2021-01-26 | 深圳市道和实业有限公司 | Flyback switching power supply circuit for driving LED fluorescent lamp |
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2020
- 2020-03-04 CN CN202020252090.4U patent/CN211377890U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271939A (en) * | 2020-11-06 | 2021-01-26 | 深圳市道和实业有限公司 | Flyback switching power supply circuit for driving LED fluorescent lamp |
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Granted publication date: 20200828 |