CN218940944U - Anti AM/FM interference's 42W power adapter - Google Patents
Anti AM/FM interference's 42W power adapter Download PDFInfo
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- CN218940944U CN218940944U CN202222707722.3U CN202222707722U CN218940944U CN 218940944 U CN218940944 U CN 218940944U CN 202222707722 U CN202222707722 U CN 202222707722U CN 218940944 U CN218940944 U CN 218940944U
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- switching transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses a 42W power adapter for resisting AM/FM interference, which comprises a mains supply input circuit, an EMI filtering electromagnetic anti-interference circuit, a bridge type rectification filter circuit, a switching transformer, a secondary rectification filter circuit, a common mode filtering and voltage output circuit, a PWM (pulse width modulation) IC (integrated circuit) switch control circuit, a MOSFET (metal oxide semiconductor field effect transistor) driving circuit and an output voltage adjusting feedback circuit; the positive pole output of the bridge rectifier filter circuit is connected to the positive pole end of the primary side main winding of the switching transformer, and the negative pole end of the primary side main winding of the switching transformer is grounded through a MOSFET driving circuit with a MOSFET; the control end of the MOSFET is connected to the PWM IC switch control circuit through a resistor; two ends of a secondary winding of the switching transformer are connected with a common mode filtering and voltage output circuit through a secondary rectifying and filtering circuit. The utility model can reduce AM/FM interference, has a relatively simple structure, and is beneficial to the miniaturization of the volume of the power adapter.
Description
Technical Field
The utility model belongs to the technical field of power adapters, and particularly relates to a 42W power adapter for resisting AM/FM interference.
Background
The traditional power adapter for the household electronic equipment such as the mobile phone and the like generally does not have an anti-interference circuit design, only some special power adapters can adopt the anti-interference design, and the special power adapters adopting the anti-interference design are generally larger in size. With the increase of the charging power of the power adapter of the electronic equipment such as a mobile phone and the like and the increase of the use of electronic products, the interference of AM and FM wave band wireless signals on the power adapter can occur, and the interference can influence the output of the power adapter, so that the adverse effect on the charging equipment is generated.
Disclosure of Invention
The utility model aims to solve the problems and provide a 42W power adapter for resisting AM/FM interference, which can reduce interference of AM and FM band wireless signals on the power adapter and keep the volume of the power adapter from increasing additionally.
The utility model is realized by the following technical scheme:
the circuit comprises a mains supply input circuit, an EMI filtering electromagnetic anti-interference circuit, a bridge rectifier filter circuit, a switching transformer, a secondary rectifier filter circuit, a common mode filtering and voltage output circuit, a PWM IC switch control circuit, a MOSFET driving circuit and an output voltage regulation feedback circuit; the commercial power input circuit is sequentially connected with the EMI filtering electromagnetic anti-interference circuit and the bridge type rectifying and filtering circuit, the positive pole output of the bridge type rectifying and filtering circuit is connected to the positive pole end of the primary side main winding of the switching transformer, and the negative pole end of the primary side main winding of the switching transformer is grounded through a MOSFET driving circuit with a MOSFET Q1; the control end of the MOSFET Q1 is connected to a chip U1 of the PWM IC switch control circuit through a resistor; the positive end of the primary side feedback winding of the switching transformer is connected to the other pin of the chip U1 and the EMI filtering electromagnetic anti-interference circuit through resistors respectively, and the negative end of the primary side feedback winding of the switching transformer is grounded; two ends of a secondary winding of the switching transformer are connected with a secondary rectifying and filtering circuit, an output end of the secondary rectifying and filtering circuit is connected with a common mode filtering and voltage output circuit, the secondary rectifying and filtering circuit outputs the filtered current through the common mode filtering circuit, and an output end of the common mode filtering and voltage output circuit is provided with an aluminum shell for shielding interference; the positive electrode input end of the common mode filtering and voltage output circuit is also connected to an output voltage adjusting feedback circuit, and the output voltage adjusting feedback circuit is connected to the input end of the chip U1 of the PWM IC switch control circuit.
Further, a fuse F1 is connected in series on the live wire of the commercial power input circuit.
Further, the common mode filtering and voltage output circuit comprises an LC filter circuit consisting of an inductor L1 and a capacitor C6.
Further, a common mode inductor LF2 is provided in the common mode filtering and voltage output circuit.
The beneficial effects of the utility model are as follows: 1. the common mode filter and voltage output circuit of the power adapter is provided with the common mode filter circuit and the aluminum shell for shielding interference, so that the interference of AM and FM wave band wireless signals on the power adapter can be reduced, and meanwhile, the power adapter is relatively simple in structure and beneficial to miniaturization of the size of the power adapter; 2. the PWM IC switch control circuit and the output voltage adjusting feedback circuit are arranged, so that the output voltage of the power adapter is more accurate, and the conversion efficiency of the power adapter is high.
Drawings
Fig. 1 is a functional block diagram of the present utility model.
Fig. 2 is a schematic circuit diagram of the present utility model.
In the figure, 1, a mains supply input circuit, 2, an EMI filtering electromagnetic anti-interference circuit, 3, a bridge rectifier filter circuit, 4, a switching transformer, 5, a secondary rectifier filter circuit, 6, a common mode filtering and voltage output circuit, 7, a PWM IC switch control circuit, 8, a MOSFET driving circuit, 9, an output voltage adjusting feedback circuit, 10 and an aluminum shell.
Detailed Description
The utility model is further described below with reference to specific examples and figures.
As shown in fig. 1 and 2, a 42W power adapter for resisting AM/FM interference includes a mains input circuit 1, an EMI filter electromagnetic anti-interference circuit 2, a bridge rectifier filter circuit 3, a switching transformer 4, a secondary rectifier filter circuit 5, a common mode filter and voltage output circuit 6, a PWM IC switch control circuit 7, a MOSFET driving circuit 8, and an output voltage adjustment feedback circuit 9.
The live wire of the mains supply input circuit 1 is connected with an overcurrent protection fuse F1 in series, the mains supply input circuit 1 is sequentially connected with an EMI filtering electromagnetic anti-interference circuit 2 and a bridge type rectifying and filtering circuit 3, the positive pole output of the bridge type rectifying and filtering circuit 3 is connected to the positive pole end of a primary side main winding of a switching transformer 4, and the negative pole end of the primary side main winding of the switching transformer 4 is grounded through a MOSFET tube driving circuit 8 with a MOSFET tube Q1; the control end of the MOSFET Q1 is connected to the pin 6 of the chip U1 of the PWM IC switch control circuit 7 through a resistor R19; one path of the positive end of the primary side feedback winding of the switching transformer 4 is connected to the 3 pin of the chip U1 through a diode D6 and a resistor R21, and the other path of the positive end of the primary side feedback winding of the switching transformer 4 is connected to the EMI filtering electromagnetic anti-interference circuit 2 through a diode D2 and resistors R14 and R15; the two ends of the secondary winding of the switching transformer 4 are connected with a secondary rectifying and filtering circuit 5, the output end of the secondary rectifying and filtering circuit 5 is connected with a common mode filtering and voltage output circuit 6, the secondary rectifying and filtering circuit is output after passing through an LC filtering circuit consisting of an inductor L1 and a capacitor C6 and a common mode inductor LF2, and the output end of the common mode filtering and voltage output circuit 6 is provided with an aluminum shell 10 for shielding interference; the positive input end of the common mode filtering and voltage output circuit 6 is also connected to an output voltage adjusting feedback circuit 9, and the output voltage adjusting feedback circuit 9 is connected to the pin 2 of the chip U1 of the PWM IC switch control circuit 7.
The above examples are only preferred embodiments of the present utility model, and are intended to be illustrative of the present utility model, and not limiting, and any changes, substitutions, combinations, simplifications, modifications, etc. which would be made by those skilled in the art without departing from the spirit and principles of the present utility model should be considered equivalent thereto, and are intended to be included in the scope of the present utility model.
Claims (4)
1. An AM/FM interference resistant 42W power adapter, characterized by: the circuit comprises a mains supply input circuit, an EMI filtering electromagnetic anti-interference circuit, a bridge rectifier filter circuit, a switching transformer, a secondary rectifier filter circuit, a common mode filtering and voltage output circuit, a PWM IC switch control circuit, a MOSFET driving circuit and an output voltage adjusting feedback circuit; the commercial power input circuit is sequentially connected with the EMI filtering electromagnetic anti-interference circuit and the bridge type rectifying and filtering circuit, the positive pole output of the bridge type rectifying and filtering circuit is connected to the positive pole end of the primary side main winding of the switching transformer, and the negative pole end of the primary side main winding of the switching transformer is grounded through a MOSFET driving circuit with a MOSFET Q1; the control end of the MOSFET Q1 is connected to a chip U1 of the PWM IC switch control circuit through a resistor; the positive end of the primary side feedback winding of the switching transformer is connected to the other pin of the chip U1 and the EMI filtering electromagnetic anti-interference circuit through resistors respectively, and the negative end of the primary side feedback winding of the switching transformer is grounded; two ends of a secondary winding of the switching transformer are connected with a secondary rectifying and filtering circuit, an output end of the secondary rectifying and filtering circuit is connected with a common mode filtering and voltage output circuit, the secondary rectifying and filtering circuit outputs the filtered current through the common mode filtering circuit, and an output end of the common mode filtering and voltage output circuit is provided with an aluminum shell for shielding interference; the positive electrode input end of the common mode filtering and voltage output circuit is also connected to an output voltage adjusting feedback circuit, and the output voltage adjusting feedback circuit is connected to the input end of the chip U1 of the PWM IC switch control circuit.
2. The AM/FM interference resistant 42W power adapter as claimed in claim 1, wherein: and a fuse F1 is connected in series on the live wire of the commercial power input circuit.
3. The AM/FM interference resistant 42W power adapter as claimed in claim 1, wherein: the common mode filtering and voltage output circuit comprises an LC filtering circuit consisting of an inductor L1 and a capacitor C6.
4. The AM/FM interference resistant 42W power adapter as claimed in claim 1, wherein: and a common mode inductor LF2 is arranged in the common mode filtering and voltage output circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222707722.3U CN218940944U (en) | 2022-10-14 | 2022-10-14 | Anti AM/FM interference's 42W power adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222707722.3U CN218940944U (en) | 2022-10-14 | 2022-10-14 | Anti AM/FM interference's 42W power adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218940944U true CN218940944U (en) | 2023-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222707722.3U Active CN218940944U (en) | 2022-10-14 | 2022-10-14 | Anti AM/FM interference's 42W power adapter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218940944U (en) |
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2022
- 2022-10-14 CN CN202222707722.3U patent/CN218940944U/en active Active
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