CN219247708U - EMI noise suppression circuit and switching power supply - Google Patents
EMI noise suppression circuit and switching power supply Download PDFInfo
- Publication number
- CN219247708U CN219247708U CN202223595227.4U CN202223595227U CN219247708U CN 219247708 U CN219247708 U CN 219247708U CN 202223595227 U CN202223595227 U CN 202223595227U CN 219247708 U CN219247708 U CN 219247708U
- Authority
- CN
- China
- Prior art keywords
- circuit
- module
- common mode
- noise
- equivalent inductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The present utility model relates to the field of electronic technologies, and in particular, to an EMI noise suppression circuit and a switching power supply. The EMI suppression noise circuit includes: a first module and a second module connected to the first module; the first module is used for suppressing differential mode noise of an input alternating current signal; the second module is used for suppressing common mode noise of the signals passing through the first module, and outputting the alternating current signals subjected to common mode noise suppression to a back-end circuit. So that the voltage power requirements of different devices in the instrument can be met, and multiple paths can be stably output.
Description
Technical Field
The present utility model relates to the field of electronic technologies, and in particular, to an EMI noise suppression circuit and a switching power supply.
Background
The regulated power supply mainly comprises a linear regulated power supply and a switching regulated power supply. The conventional linear power supply working area is an amplifying area, and the switch can generate a large amount of electric energy consumption in the process of outputting voltage, so that the linear power supply generates heat and consumes energy, and the conversion efficiency is reduced; the switching power supply can select a high-frequency transformer with high efficiency and low energy consumption, and the characteristics of small volume and light weight can be used as an auxiliary power supply in a plurality of devices. The inventor finds that the existing switching power supply has a complex structure and higher power supply cost, and can not better meet the power requirements of different devices.
Disclosure of Invention
The utility model aims to provide an EMI noise suppression circuit and a switching power supply, and the EMI noise suppression circuit in the switching power supply is improved to be a three-terminal EMI noise suppression circuit, so that the switching power supply can meet the voltage power requirements of different devices in an instrument, and meanwhile, multiple paths of output can be stably realized.
To solve the above technical problem, an embodiment of the present utility model provides an EMI suppression noise circuit, including: a first module and a second module connected to the first module; the first module is used for suppressing differential mode noise of an input alternating current signal; the second module is used for suppressing common mode noise of the signals passing through the first module, and outputting the alternating current signals subjected to common mode noise suppression to a back-end circuit.
To solve the above technical problem, embodiments of the present utility model further provide a switching power supply for converting an ac power transmitted by an ac power source into a dc power and outputting the dc power, where the switching power supply includes the EMI suppression noise circuit as described above.
In an embodiment of the present application, a first module and a second module connected to the first module are used; the first module is used for suppressing differential mode noise of an input alternating current signal; the second module is used for suppressing common mode noise of the signals passing through the first module, and outputting the alternating current signals subjected to common mode noise suppression to a back-end circuit. Because the EMI noise suppression circuit in the utility model is structurally changed from the existing single-machine filter circuit structure into a three-terminal capacitor structure; functionally, the EMI noise suppression circuit is used for removing differential mode interference and common mode interference in an input alternating current signal, so that the influence of high-frequency noise on the whole circuit is reduced, and therefore, the switching power supply comprising the EMI noise suppression circuit can meet the voltage power requirements of different equipment in an instrument, and meanwhile, multiple paths are stably output.
In a specific embodiment, the first module comprises: the first differential mode capacitor, the second differential mode capacitor, the common mode choke, the first equivalent inductor and the second equivalent inductor; one end of the common mode choke is connected with the first differential mode capacitor, and the other end of the common mode choke is connected with the second differential mode capacitor; one end of the second differential mode capacitor is connected with one end of the first equivalent inductor, and the other end of the second differential mode capacitor is connected with one end of the second equivalent inductor; the other end of the first equivalent inductor and the other end of the second equivalent inductor are connected with the second module. The differential mode noise can be effectively restrained, and the influence of high-frequency noise on the whole circuit is further reduced.
In a specific embodiment, the second module comprises: the first common mode capacitor, the second common mode capacitor, the third equivalent inductor and the fourth equivalent inductor; one end of the first common mode capacitor is connected with one end of the second common mode capacitor, and the other end of the first common mode capacitor is connected with one end of the third equivalent inductor; the other end of the second common mode capacitor is connected with one end of the fourth equivalent inductor; the other end of the first equivalent inductor is connected with one end of the third equivalent inductor; the other end of the second equivalent inductor is connected with one end of the fourth equivalent inductor; and the other end of the third equivalent inductor and the other end of the fourth equivalent inductor are connected with the back-end circuit. Common mode noise can be effectively restrained, and then the influence of high-frequency noise on the whole circuit is reduced.
In a specific embodiment, the first differential mode capacitor and the second differential mode capacitor each have a value of 0.1uF. The frequency is raised and differential mode noise is filtered as much as possible under the condition of ensuring the safety of a circuit and an operator.
In a specific embodiment, the first common-mode capacitor and the second common-mode capacitor are ceramic capacitors with capacitance values of 10 nF. The leakage current generated under rated voltage is lower than a safety value, and danger caused by breakdown is avoided.
In a specific embodiment, the common mode choke has a value of 10uH.
In a specific embodiment, the values of the first equivalent inductance, the second equivalent inductance, the third equivalent inductance and the fourth equivalent inductance are all 0.36nH.
Drawings
FIG. 1 is a block diagram of an EMI suppression noise circuit of the present utility model;
FIG. 2 is a block diagram of a first module of the EMI suppression noise circuit of the present utility model;
FIG. 3 is a block diagram of a second module in the EMI suppression noise circuit of the present utility model;
fig. 4 is a circuit configuration diagram of the switching power supply of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present utility model, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be realized without these technical details and various changes and modifications based on the following embodiments.
One embodiment of the present utility model relates to an EMI suppression noise circuit, as shown in fig. 1, a first module 1 and a second module 2 connected to the first module 1; the first module 1 is used for suppressing differential mode noise of an input alternating current signal; the second module 2 is configured to suppress common mode noise of the signal passing through the first module, and output an ac signal after the common mode noise suppression to the back-end circuit.
Further, as shown in fig. 2, the first module of the EMI suppression noise circuit 2 specifically includes: the first differential-mode capacitor CX1, the second differential-mode capacitor CX2, the common-mode choke 11, the first equivalent inductance ESL1 and the second equivalent inductance ESL2; one end of the common mode choke 11 is connected to the first differential mode capacitor CX1, and the other end of the common mode choke 11 is connected to the second differential mode capacitor CX 2; one end of the second differential-mode capacitor CX2 is connected with one end of the first equivalent inductor ESL1, and the other end of the second differential-mode capacitor CX2 is connected with one end of the second equivalent inductor ESL2; the other end of the first equivalent inductance ESL1 and the other end of the second equivalent inductance ESL2 are connected with the second module 2. The first differential mode capacitor CX1 and the first module 2 can effectively inhibit differential mode noise, so that the influence of high-frequency noise on the whole circuit is reduced.
Further, as shown in fig. 3, the second module of the EMI suppression noise circuit 3 specifically includes: a first common mode capacitance CY1, a second common mode capacitance CY2, a third equivalent inductance ESL3 and a fourth equivalent electrical ESL4; one end of the first common mode capacitor CY1 is connected with one end of the second common mode capacitor CY2, and the other end of the first common mode capacitor CY1 is connected with one end of the third equivalent inductor ESL 3; the other end of the second common mode capacitor CY2 is connected with one end of a fourth equivalent inductor ESL4; the other end of the first equivalent inductance ESL1 is connected with one end of the third equivalent inductance ESL 3; the other end of the second equivalent inductance ESL2 is connected with one end of the fourth equivalent inductance ESL4; the other end of the third equivalent inductance ESL3 and the other end of the fourth equivalent inductance ESL4 are connected with a back-end circuit. The second module 3 can effectively inhibit common mode noise, so that the influence of high-frequency noise on the whole circuit is reduced.
Further, the first differential capacitance CX1 and the second differential capacitance CX2 have a value of 0.1uF. The reasonable values of the two differential mode capacitors are beneficial to raising the frequency and filtering differential mode noise as much as possible under the condition of ensuring the safety of a circuit and an operator.
Further, the first common-mode capacitor CY1 and the second common-mode capacitor CY2 are ceramic capacitors with capacitance value of 10 nF. The reasonable value of the two common-mode capacitors is favorable for ensuring that the leakage current generated under the rated voltage is lower than the safety value, avoiding danger caused by breakdown, wherein the value of the common-mode choke coil 4 is 10uH, and the values of the first equivalent inductor ESL1, the second equivalent inductor ESL2, the third equivalent inductor ESL3 and the fourth equivalent inductor ESL4 are all 0.36nH.
In this embodiment, the first module and the second module connected to the first module are used; the first module is used for suppressing differential mode noise of an input alternating current signal; the second module is used for suppressing common mode noise of the signals passing through the first module and outputting alternating current signals subjected to common mode noise suppression to the back-end circuit. Because the EMI noise suppression circuit in the utility model is structurally changed from the existing single-machine filter circuit structure into a three-terminal capacitor structure; functionally, the EMI noise suppression circuit is used for removing differential mode interference and common mode interference in an input alternating current signal, so that the influence of high-frequency noise on the whole circuit is reduced, and therefore, the switching power supply comprising the EMI noise suppression circuit can meet the voltage power requirements of different equipment in an instrument, and meanwhile, multiple paths are stably output.
An embodiment of the present utility model provides a switching power supply, a circuit structure of which is shown in fig. 4, the switching power supply includes: the input protection circuit is connected with the EMI noise suppression circuit, the EMI noise suppression circuit is connected with the input rectification circuit, the input rectification circuit is connected with the power switching tube, the power switching tube is connected with the high-frequency transformer, the high-frequency transformer is connected with the output rectification circuit, and the output rectification circuit is connected with the control rectification circuit; the RCD clamp circuit, the power switch tube and the high-frequency transformer in FIG. 4 form a switch converter of the switch power supply; wherein, the control circuit specifically includes: the power supply chip UC3842, the chip starting and power supply circuit, the clock oscillation circuit, the power switch driving circuit, the current sampling and current limiting and the voltage feedback circuit are all connected with the power supply chip UC 3842. Because the EMI filter circuit of the switching power supply adopts the EMI noise suppression circuit in the embodiment, the EMI noise suppression circuit in the embodiment is structurally changed into a three-terminal capacitor structure from the existing single-machine filter circuit structure; functionally, the EMI noise suppression circuit removes differential mode interference and common mode interference in an input alternating current signal, so that the influence of high-frequency noise on the whole circuit is reduced, and the switching power supply comprising the EMI noise suppression circuit can meet the voltage power requirements of different equipment in an instrument and stably output multiple paths.
The working principle of the switching power supply of the utility model is as follows: the method comprises the steps of switching in 220V alternating current, inputting the 220V alternating current into a protection circuit, inputting an EMI noise suppression circuit after protection, wherein the EMI noise suppression circuit specifically comprises: a first module 1 and a second module 2 connected to the first module 1; the first module 1 is used for suppressing differential mode noise of an input alternating current signal; the second module 2 is configured to suppress common mode noise of the signal passing through the first module, and output an ac signal after the common mode noise suppression to the back-end circuit. Wherein the first module 2 specifically comprises: the first differential-mode capacitor CX1, the second differential-mode capacitor CX2, the common-mode choke 11, the first equivalent inductance ESL1 and the second equivalent inductance ESL2; one end of the common mode choke 11 is connected to the first differential mode capacitor CX1, and the other end of the common mode choke 11 is connected to the second differential mode capacitor CX 2; one end of the second differential-mode capacitor CX2 is connected with one end of the first equivalent inductor ESL1, and the other end of the second differential-mode capacitor CX2 is connected with one end of the second equivalent inductor ESL2; the other end of the first equivalent inductance ESL1 and the other end of the second equivalent inductance ESL2 are connected with the second module 2. The first differential mode capacitor CX1 and the first module 2 can effectively inhibit differential mode noise, so that the influence of high-frequency noise on the whole circuit is reduced; further, the second module 3 specifically includes: a first common mode capacitance CY1, a second common mode capacitance CY2, a third equivalent inductance ESL3 and a fourth equivalent electrical ESL4; one end of the first common mode capacitor CY1 is connected with one end of the second common mode capacitor CY2, and the other end of the first common mode capacitor CY1 is connected with one end of the third equivalent inductor ESL 3; the other end of the second common mode capacitor CY2 is connected with one end of a fourth equivalent inductor ESL4; the other end of the first equivalent inductance ESL1 is connected with one end of the third equivalent inductance ESL 3; the other end of the second equivalent inductance ESL2 is connected with one end of the fourth equivalent inductance ESL4; the other end of the third equivalent inductance ESL3 and the other end of the fourth equivalent inductance ESL4 are connected with a back-end circuit. The second module 3 can effectively inhibit common mode noise, so that the influence of high-frequency noise on the whole circuit is reduced; the filtered signals are input into a rectifying circuit, the rectifying circuit outputs direct current, and the direct current is finally input into a control circuit, so that the whole switching power supply starts to work, the output stability of the system is ensured by adjusting the duty ratio of output pulses, and the switching power supply meets the voltage power requirements of different equipment in an instrument.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the utility model and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.
Claims (9)
1. An EMI suppression noise circuit, comprising: a first module and a second module connected to the first module;
the first module is used for suppressing differential mode noise of an input alternating current signal;
the second module is used for suppressing common mode noise of the signals passing through the first module, and outputting the alternating current signals subjected to common mode noise suppression to a back-end circuit.
2. The EMI suppression noise circuit of claim 1, wherein the first module comprises: the first differential mode capacitor, the second differential mode capacitor, the common mode choke, the first equivalent inductor and the second equivalent inductor;
one end of the common mode choke is connected with the first differential mode capacitor, and the other end of the common mode choke is connected with the second differential mode capacitor;
one end of the second differential mode capacitor is connected with one end of the first equivalent inductor, and the other end of the second differential mode capacitor is connected with one end of the second equivalent inductor;
the other end of the first equivalent inductor and the other end of the second equivalent inductor are connected with the second module.
3. The EMI suppression noise circuit of claim 2, wherein the second module includes: the first common mode capacitor, the second common mode capacitor, the third equivalent inductor and the fourth equivalent inductor;
one end of the first common mode capacitor is connected with one end of the second common mode capacitor, and the other end of the first common mode capacitor is connected with one end of the third equivalent inductor;
the other end of the second common mode capacitor is connected with one end of the fourth equivalent inductor;
the other end of the first equivalent inductor is connected with one end of the third equivalent inductor;
the other end of the second equivalent inductor is connected with one end of the fourth equivalent inductor;
and the other end of the third equivalent inductor and the other end of the fourth equivalent inductor are connected with the back-end circuit.
4. The EMI suppression noise circuit of claim 2, wherein the first differential mode capacitance and the second differential mode capacitance each have a value of 0.1uF.
5. The EMI suppressing noise circuit of claim 3, wherein the first common mode capacitor and the second common mode capacitor are ceramic capacitors having a capacitance value of 10 nF.
6. The EMI suppression noise circuit of claim 2, wherein the common mode choke has a value of 10uH.
7. The EMI suppression noise circuit of claim 3, wherein the first equivalent inductance, the second equivalent inductance, the third equivalent inductance, and the fourth equivalent inductance are each 0.36nH.
8. A switching power supply for converting alternating current power transmitted from an alternating current power supply into direct current power and outputting the direct current power, characterized in that the switching power supply comprises the EMI suppression noise circuit as claimed in any one of claims 1-7.
9. The switching power supply of claim 8 wherein: the switching power supply further includes:
the power supply circuit comprises an input protection circuit, an input rectifying circuit, a power switch tube, a high-frequency transformer, an output rectifying circuit and a control circuit; the input protection circuit is connected with the EMI noise suppression circuit, the EMI noise suppression circuit is connected with the input rectifying circuit, the input rectifying circuit is connected with the power switch tube, the power switch tube is connected with the high-frequency transformer, the high-frequency transformer is connected with the output rectifying circuit, and the output rectifying circuit is connected with the control rectifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223595227.4U CN219247708U (en) | 2022-12-30 | 2022-12-30 | EMI noise suppression circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223595227.4U CN219247708U (en) | 2022-12-30 | 2022-12-30 | EMI noise suppression circuit and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219247708U true CN219247708U (en) | 2023-06-23 |
Family
ID=86811345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223595227.4U Active CN219247708U (en) | 2022-12-30 | 2022-12-30 | EMI noise suppression circuit and switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219247708U (en) |
-
2022
- 2022-12-30 CN CN202223595227.4U patent/CN219247708U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106981990B (en) | Unidirectional isolation type multistage direct current-direct current electric energy conversion device and method thereof | |
| CN106533152A (en) | Device and method for improving PF of Boost three-level converter | |
| CN107666250B (en) | Single-stage phase and amplitude controllable alternating current converter and working method thereof | |
| CN106208772A (en) | High frequency chain matrix inverter parallel connection improves virtual impedance and the method for power filter | |
| CN219247708U (en) | EMI noise suppression circuit and switching power supply | |
| CN111510007B (en) | Hybrid isolation type single-phase power electronic transformer | |
| CN107888089B (en) | High-voltage direct-current power supply | |
| CN217115920U (en) | 100W four-way low EMI flyback switching power supply and circuit thereof | |
| CN113659863B (en) | Double-end common-ground inverter | |
| CN213817609U (en) | Direct current high voltage generator that voltage stability is high | |
| CN112564514A (en) | High-frequency power supply system for electric precipitation | |
| CN210351010U (en) | Variable frequency power supply filter | |
| CN212518413U (en) | Three-phase background harmonic isolator | |
| CN220382954U (en) | Efficient switching power supply circuit | |
| CN110572053A (en) | Fractional order D-type half-wave rectifier and parameter design method thereof | |
| CN213585563U (en) | Filter circuit and switching power supply | |
| CN220711360U (en) | Common-mode voltage suppression circuit and electrical equipment of three-level three-phase four-bridge-arm AC/DC converter | |
| CN203339943U (en) | Secondary power supply converter for minimum output ripple | |
| CN203466723U (en) | Novel DC-DC secondary power source converter | |
| CN217656560U (en) | Anti-disturbance direct-current isolation voltage conversion circuit | |
| CN110504839A (en) | Simplify the multistage DC-DC device for converting electric energy of one-way isolation formula and its method | |
| Stala et al. | DC-DC Converter With Low Input Current Ripples in Hybrid Switched-Capacitor and Boost Topology | |
| CN219164451U (en) | Power supply device | |
| CN217824388U (en) | Charging circuit and charging equipment | |
| CN217428008U (en) | Three-phase alternating current input airborne power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |